close

Вход

Забыли?

вход по аккаунту

?

JP2018125818

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2018125818
Abstract: The present invention provides a speaker device capable of reducing the phase shift of
an acoustic signal output from each acoustic driver and outputting an acoustic signal of large
acoustic energy. A speaker module includes a plurality of first acoustic drivers each outputting a
plurality of first acoustic signals, and a plurality of first acoustic signals output from the plurality
of first acoustic drivers. A plurality of first acoustic signals input to the input port and introduced
to the plurality of input ports are guided to a common output port, and the plurality of first
acoustic signals are combined by the common output port to generate a second acoustic signal.
An acoustic coupler having an acoustic path for generating and outputting the generated second
acoustic signal. The lengths from the plurality of input ports to the common output port in the
acoustic path are equal to one another. [Selected figure] Figure 5
Speaker device
[0001]
The present disclosure relates to a speaker device.
[0002]
Conventionally, a loudspeaker is known that has a waveguide, a plurality of drivers, and a
plurality of throats acoustically coupled to each driver at the inlet and coupled to the waveguide
at the mouth acoustically respectively. Patent Document 1).
02-05-2019
1
The loudspeaker optimizes the distribution of acoustic energy in this plane by forming an arc in
the plane in which the axis of each throat includes the long axis of the waveguide.
[0003]
U.S. Pat. No. 6,394,223
[0004]
In the loudspeaker of Patent Document 1, when combining acoustic signals at the mouth of the
waveguide, it is necessary to accurately adjust the alignment between the throats, and a phase
shift occurs in the acoustic signals output from the throats of the drivers. easy.
[0005]
Further, in the loudspeaker of Patent Document 1, since the speaker for MF (Medium Frequency)
and the speaker for HF (High Frequency) are separately disposed, the acoustic signal output from
the speaker for MF and for HF are arranged. A phase shift is likely to occur with the acoustic
signal output from the speaker.
[0006]
In addition, since the mouth of the throat of each driver is aligned in the major axis direction at
the sound holes of the waveguide, acoustic energy (power) tends to be insufficient.
[0007]
The present disclosure has been made in view of the above circumstances, and provides a
speaker device capable of reducing the phase shift of the acoustic signal output from each
acoustic driver and outputting an acoustic signal of large acoustic energy.
[0008]
The speaker device of the present disclosure includes a plurality of first acoustic drivers that
respectively output a plurality of first acoustic signals, and a plurality of inputs of a plurality of
first acoustic signals output from the plurality of first acoustic drivers. A plurality of first sound
signals input to the mouth and input to the plurality of input ports are guided to a common
output port, and the plurality of first sound signals are combined at the common output port to
generate a second sound signal And an acoustic coupler having an acoustic passage for
02-05-2019
2
outputting the generated second acoustic signal.
The lengths from the plurality of input ports to the common output port in the acoustic path are
equal to one another.
[0009]
According to the present disclosure, it is possible to reduce the phase shift of the acoustic signal
output from each acoustic driver, and output an acoustic signal of large acoustic energy.
[0010]
The figure which shows an example of the appearance of a speaker array in a 1st embodiment
The front view showing the appearance of a speaker module The side view showing the
appearance of a speaker module The sectional view showing an example of the structure of a
speaker module The appearance of MF / HF driver unit The perspective view which shows It is
sectional drawing which shows the structure of the connection part of MF / HF driver in a MF /
HF driver unit, and an acoustic coupler. Sectional drawing which shows the structure of the
horizontal direction of an acoustic coupler. A perspective view showing the appearance of two
adjacent MF / HF driver units as viewed from the driver side A perspective view showing the
appearance of two adjacent MF / HF driver units as viewed from the acoustic coupler side
Diagram showing the shape of the waveguide when viewed from above MF / HF driver unit
Distribution chart showing sound pressure level in horizontal direction Distribution chart
showing sound pressure level in vertical direction of MF / HF driver unit Specific example of
relationship between angle of each measurement point in horizontal direction and sound
pressure level (relative value) Figure showing a specific example of the relationship between the
angle of each measurement point in the vertical direction and the sound pressure level (relative
value) A three-dimensional position where the horizontal directivity characteristics from the
acoustic coupler to the waveguide are measured is a mesh shape A diagram showing the phase
characteristics from the acoustic coupler to the waveguide A graph showing the horizontal
pointing angle (measurement value) for each frequency of the acoustic signal output from the MF
/ HF driver unit From the acoustic driver in Comparative Example 1 Graph showing horizontal
pointing angle (measured value) for each frequency of output acoustic signal Frequency of
acoustic signal output from acoustic driver in comparative example 2 Graph showing horizontal
pointing angle (measured value) for each graph Graph showing vertical pointing angle (measured
value) for each frequency of an acoustic signal outputted from the MF / HF driver unit An
example of the appearance of the speaker array in the second embodiment The figure which
shows the front view which shows the appearance of a speaker module The side view which
shows the appearance of a speaker module The cross section which shows an example of the
structure of a speaker module The perspective view which shows the appearance of a wave guide
02-05-2019
3
Cross section showing the shape Graph showing horizontal pointing angle (measurement value)
for each frequency of the sound signal output from the HF driver Graph showing vertical
pointing angle (measurement value) for each frequency of the sound signal output from the HF
driver
[0011]
Hereinafter, embodiments will be described in detail with reference to the drawings as
appropriate.
However, the detailed description may be omitted if necessary.
For example, detailed description of already well-known matters and redundant description of
substantially the same configuration may be omitted.
This is to avoid unnecessary redundancy in the following description and to facilitate
understanding by those skilled in the art.
It is to be understood that the attached drawings and the following description are provided to
enable those skilled in the art to fully understand the present disclosure, and they are not
intended to limit the claimed subject matter.
[0012]
The speaker apparatus of the following embodiment is applied to the speaker module which
carries out multiple connection and builds a speaker array (array speaker) as an example.
The speaker array may be installed in a large area such as an outdoor concert hall, and may
implement a loudspeaker system that outputs an acoustic signal with large acoustic energy so
that a large audience can listen.
02-05-2019
4
[0013]
First Embodiment FIG. 1 is a view showing an example of an appearance of a speaker array 5
according to a first embodiment.
The speaker array 5 is configured to include a plurality of speaker modules 10 connected in a
line. The housings 10z of each speaker module 10 are adjacent to and integrated with the
housings 10z of the upper and lower speaker modules 10 on the upper surface and the lower
surface, respectively. That is, in the speaker array 5, by combining the speaker modules 10 in a
line shape, the range covering the vertical direction in which the acoustic signal output from the
speaker array 5 is transmitted becomes variable. Further, the angle at which the speaker module
10 disperses the acoustic signal in the horizontal direction is constant.
[0014]
Here, in order to make the description easy to understand, assuming that the speaker array 5 is
used in a vertically placed state, the line direction of the speaker array 5 (the short direction of
the front surface of the casing of the speaker module 10) is vertical. The direction perpendicular
to the vertical direction including the longitudinal direction of the front of the case is taken as the
horizontal direction. In addition, the speaker array 5 may be placed and used at any angle, such
as in a horizontally placed state. Further, the surface on which the acoustic signal is output may
be referred to as the front surface.
[0015]
Therefore, as described later, the horizontal direction is an example of the arrangement direction
in which a plurality of medium frequency (MF) / high frequency (HF) drivers connected to the
acoustic couplers in the speaker module 10 are arranged. Further, the vertical direction is an
example of a direction orthogonal to the arrangement direction.
[0016]
FIG. 2A is a front view showing the appearance of the speaker module 10. FIG. 2B is a side view
02-05-2019
5
showing the appearance of the speaker module 10. The speaker module 10 has a substantially
rectangular parallelepiped housing 10z. On the front surface of the housing 10z, a waterproof
sheet 11 having water repellency is provided to prevent intrusion of rain or the like. A handle 13
for gripping the speaker module 10 is attached to the front of the side surface of the housing
10z.
[0017]
FIG. 3 is a cross-sectional view showing an example of the structure of the speaker module 10.
FIG. 3 shows a cross section of the housing 10z of the speaker module 10 along the horizontal
direction (longitudinal direction of the housing). A waveguide (also referred to as a horn) 21 is
disposed at the center of the front surface of the housing 10z.
[0018]
At the back of the waveguide 21, the MF / HF driver units 40 are arranged in two stages in the
vertical direction. The MF / HF driver unit 40 has, for example, an acoustic driver (HF driver) for
HF (for high frequency range) of 1.75 inches and an acoustic driver (MF driver) for MF (for
medium frequency range) for 3.5 inches, for example. And. The MF / HF driver unit 40 outputs,
for example, an acoustic signal in the middle range of 500 Hz to 6 kHz and an acoustic signal in
the high range exceeding 6 kHz, in front of the housing 10z. That is, the MF / HF driver unit 40
outputs an acoustic signal in the middle to high range. Details of the MF / HF driver unit 40 will
be described later. The waveguide 21 spreads the acoustic signal output from the MF / HF driver
unit 40 in the horizontal direction.
[0019]
On both sides of the front surface of the casing 10z sandwiching the waveguide 21, LF drivers
31, 32 which are acoustic drivers for LF (Low Frequency) are disposed. The LF drivers 31 and 32
are, for example, 12-inch acoustic drivers. The LF drivers 31 and 32 output, for example, an
audio signal of a low frequency band of 500 Hz or less in front of the housing 10z. The sound
signal in the low frequency range output from the LF drivers 31 and 32 has low directivity. For
example, the sound signals can be output from the back of the LF drivers 31 and 32. Here, the
number of LF drivers is two, but may be three or more.
02-05-2019
6
[0020]
Rear passages 15 and 16 are formed on both ends of the housing 10z using a bass reflex port
BP. The rear passages 15 and 16 communicate with the back of the LF drivers 31 and 32, and
lead the sound signal of the low frequency range outputted from the back of the LF drivers 31
and 32 to the front of the housing 10z.
[0021]
The MF / HF driver unit 40 and the two LF drivers 31, 32 may be arranged symmetrically in the
horizontal direction (for example, in the left and right direction in FIG. 3) with reference to the
MF / HF driver unit 40. In this case, the center line (sound center line) of the sound signal output
from the speaker module 10 coincides with the sound center line of the middle to high sound
range sound signal output from the MF / HF driver unit 40. The acoustic center line of the
middle to high frequency range acoustic signal output from the MF / HF driver unit 40 is shown
as a virtual axis AX2.
[0022]
A predetermined position on the sound center line of the speaker module 10 is set as a sound
center position sc (see FIG. 3). The predetermined position is, for example, a position where the
virtual axis AX2 intersects with the middle line of the waveguide 21.
[0023]
The distance from the sound center position sc to the output ports 31z and 32z of the LF drivers
31 and 32 may be determined based on the frequency band of the sound signal in the bass
range. Also, the difference between the distance from one listening position (not shown) to each
of the output ports (for example, the output ports 31z and 32z) of the two acoustic drivers (for
example, the LF drivers 31 and 32) Also referred to as the acoustic center distance of the driver.
That is, assuming that two acoustic drivers are the acoustic drivers A and B, the acoustic center
distance is the distance A from the listening position to the output port of the acoustic driver A,
and the distance B from the listening position to the output port of the acoustic driver B It is
02-05-2019
7
shown by the difference of. The listening position is the position of the listener who listens to the
acoustic signal output from the speaker module 10.
[0024]
Specifically, when the frequency band of the low frequency range acoustic signal is 500 Hz or
less, the output ports 31z, 32z of the LF drivers 31, 32 are, for example, circles with a radius of
260 mm to 280 mm (268 mm as an example) from the acoustic center position sc. It is arranged
on the circumference r1. For example, when the frequency of the low frequency range acoustic
signal is 500 Hz, 1⁄4 × λ (the wavelength of the low frequency range acoustic signal), which is
an allowable range of the phase shift, is approximately 18 cm. Therefore, the acoustic center
distance may be set with this value (18 cm) as a guide.
[0025]
In general, when the phase shift between a plurality of acoustic signals approaches 180 °, they
tend to be in antiphase and to be attenuated. On the other hand, if the phase shift between the
plurality of acoustic signals is within 90 ° (1/4 × λ), it is difficult for the acoustic energy to be
attenuated. In the case of the above-described low-range acoustic signal, the LF drivers 31 and
32 as sound sources may be disposed so that the acoustic center distance is within about 18 cm
(for example, 20 cm). Even if there is a slight error in the arrangement position, the phase shift is
small, and in the case of the sound signal in the low frequency range, the influence is small.
[0026]
In addition, in the LF drivers 31 and 32, the virtual axis AX3 (AX3a, AX3b) indicating the
acoustic center line of the sound signal in the low range is 8 ° with respect to the virtual axis
AX2 indicating the acoustic center line of the medium and high pitch sound signal. May be tilted.
That is, the LF drivers 31 and 32 may be disposed at an angle of 8 ° in the direction in which
the output ports 31z and 32z of the LF drivers 31 and 32 approach each other with respect to
the virtual axes AX3a and AX3b. Thus, by inclining the output side of the LF drivers 31 and 32
inward, the output ports 31z and 32z come closer, and the distance between the output ports
31z and 32z of the LF drivers 31 and 32 can be shortened. The sound center distance of 31, 32
can be shortened. Therefore, it is possible to reduce the phase shift between the sound signals in
the low frequency range outputted from the LF drivers 31 and 32. The inclination angle of 8 °
02-05-2019
8
may be determined according to the size of the housing 10z and the frequency of the acoustic
signal.
[0027]
The housing 10z has a partition wall 10w, and divides the LF drivers 31, 32 and the MF / HF
driver unit 40, respectively. Thereby, the speaker module 10 can suppress that each acoustic
signal (for example, acoustic signal of a bass region) output from an acoustic driver enters into
the area of another acoustic driver, and an acoustic signal interferes.
[0028]
FIG. 4 is a perspective view showing the appearance of the MF / HF driver unit 40. As shown in
FIG.
[0029]
The MF / HF driver units 40 respectively generate and combine mid-to-high range acoustic
signals and generate one mid-to-high range acoustic signal.
An acoustic center line to which an output middle-to-high range acoustic signal is transmitted is a
virtual axis AX2 (see FIG. 3).
[0030]
The MF / HF driver unit 40 has a structure in which two MF / HF drivers 41 and 42 and an
acoustic coupler 45 are connected. The MF / HF drivers 41 and 42 are coaxial type driver units
in which an MF driver and an HF driver are coaxially arranged.
[0031]
In the coaxial type driver unit, for example, a voice coil of a plane wave driver for MF is disposed
02-05-2019
9
around a voice coil of a plane wave driver for HF. The voice coil for HF and the voice coil for MF
are centered for coaxial purposes. This center is located on the acoustic center line of the
acoustic signal generated by the voice coil for HF and the acoustic signal generated by the voice
coil for MF.
[0032]
When the acoustic center line to which the high-range acoustic signal is transmitted matches the
acoustic center line to which the mid-range acoustic signal is transmitted, the time difference
between the high-range acoustic signal and the mid-range acoustic signal disappears Phase
interference is less likely to occur between the two. Here, the high-pitched sound signal and the
mid-pitched sound signal are output from the MF / HF drivers 41 and 42 in the same phase.
[0033]
Since the frequency band of the sound output from the MF / HF driver unit 40 includes sounds in
the middle to high frequency range, a phase shift easily occurs unless the distance between the
two MF / HF drivers 41 and 42 is shortened. Become. The higher the frequency band of the
acoustic signal, the shorter the wavelength of the acoustic signal, and the more easily the phase
shift occurs. That is, since the wavelength of the acoustic signal becomes shorter as the
frequency band of the acoustic signal becomes higher, the value of 1/4 × λ becomes smaller.
Therefore, if the distance between the two MF / HF drivers 41 and 42 is shortened and accurate
alignment is not performed, phase shift easily occurs.
[0034]
Further, as the distance between the two MF / HF drivers 41 and 42 is shortened, the size of the
MF / HF drivers 41 and 42 needs to be reduced. When the size of the MF / HF drivers 41 and 42
is reduced, the power of the acoustic signal output from the MF / HF drivers 41 and 42
decreases. Therefore, the speaker module 10 can secure the power of the acoustic signal by
providing a plurality of the MF / HF drivers 41 and 42.
[0035]
02-05-2019
10
FIG. 5 is a cross-sectional view showing a structure of a connecting portion of the MF / HF
drivers 41 and 42 and the acoustic coupler 45 in the MF / HF driver unit 40. As shown in FIG.
For acoustic coupler 45, the internal acoustic path is shown.
[0036]
The acoustic coupler 45 is an acoustic tube having a substantially V-shaped acoustic passage 47,
48. The acoustic coupler 45 guides, to the common output port OT, acoustic signals in the middle
to high frequency range outputted from the MF / HF drivers 41 and 42 connected to the end
faces of the attachment portions 51 and 52, respectively. The MF / HF drivers 41 and 42 are
attached to the attachment portion 52. The attachment portions 51 and 52 are formed with two
input ports IN1 and IN2 of the acoustic paths 47 and 48, respectively. The acoustic coupler 45
combines the two middle to high frequency range acoustic signals at a common output port OT,
and outputs the combined signal from the common output port OT.
[0037]
In the acoustic coupler 45, the MF / HF drivers 41 and 42 are connected so as to be in phase at
an angle of, for example, 41 ° to 43 ° (42 ° as an example in FIG. 5) in the horizontal
direction. By setting the angle in the horizontal direction to 41 ° to 43 °, middle to high-range
sound output from each of the MF / HF drivers 41 and 42 without the two MF / HF drivers 41
and 42 abutting A signal may be introduced to the acoustic coupler 45. Also, the MF / HF drivers
41 and 42 can increase the output of the middle-to-high range acoustic signal by the same phase
of the middle-to-high range acoustic signal being output from each, and SPL (Sound representing
the sound pressure level) Pressure Level can be increased.
[0038]
FIG. 6 is a cross-sectional view showing the structure of the acoustic coupler 45 in the horizontal
direction. The side surfaces F1 of the acoustic passages 47 and 48 in the horizontal direction are
formed to form an angle of, for example, 96 ° with respect to the end surface F2 outside the
input ports IN1 and IN2 of the attachment portions 51 and 52, respectively. In other words, the
side surfaces F1 of the acoustic paths 47 and 48 are formed to form, for example, an angle of 84
° with respect to the input ports IN1 and IN2 which are the opening surfaces of the attachment
02-05-2019
11
portions 51 and 52, respectively. Therefore, the acoustic paths 47 and 48 have a structure that
narrows toward the output port OT (the diameter decreases in the horizontal direction). The
acoustic paths 47 and 48 have equal lengths from the input ports IN1 and IN2 to the output port
OT.
[0039]
As a result, the two mid-high range acoustic signals output from the MF / HF drivers 41 and 42
are transmitted through the acoustic paths 47 and 48 and combined, and the combined mid-high
range acoustic signals are output ports. Output from OT.
[0040]
FIG. 7 is a cross-sectional view showing the shape of the sound paths 47 and 48 in the vertical
direction.
The ceiling surface F3 and the bottom surface F4 of the acoustic paths 47, 48 are, for example, 1
with respect to a virtual axis AX1 indicating an acoustic center line to which an acoustic signal in
the middle to high range is transmitted from the input ports IN1, IN2 It has an angle of °. That
is, the sound paths 47 and 48 (parts of the sound paths) decrease in diameter in the vertical
direction from the input ports IN1 and IN2 toward the output port OT.
[0041]
The MF / HF driver unit 40 is attached to the waveguide 21 in upper and lower two stages (two
stages in the vertical direction). FIG. 8 is a perspective view showing the appearance of two MF /
HF driver units 40 adjacent to the upper and lower sides when viewed from the MF / HF drivers
41 and 42 side. FIG. 9 is a perspective view showing the appearance of two MF / HF driver units
40 adjacent to the upper and lower sides when viewed from the acoustic coupler 45 side.
[0042]
By providing two MF / HF drivers 41 and 42 aligned in the horizontal direction in the vertical
direction, four acoustic drivers are connected in serial parallel in a 2 × 2 matrix. Thereby, the
02-05-2019
12
power of the obtained acoustic signal is quadrupled as compared with the case where one
acoustic driver is used. Then, since the phase shift of the acoustic signal output from between the
two MF / HF drivers 41 and 42 is reduced by the acoustic coupler 45, the speaker module 10
increases the power of the acoustic signal while the power due to the phase shift is generated.
Can be controlled.
[0043]
Although one acoustic coupler is coupled to two acoustic drivers here, one acoustic coupler may
be coupled to four acoustic drivers arranged in serial parallel. .
[0044]
In the MF / HF driver unit 40, the traveling directions of the acoustic signals transmitted by the
MF / HF drivers 41 and 42 are regulated by the acoustic paths 47 and 48, and the acoustic
signals are output from the waveguide 21 to finally The directivity of the output acoustic signal
may be formed.
For example, in the vertical direction, the acoustic paths 47 and 48 of the acoustic signals output
from the MF / HF drivers 41 and 42 are reduced in diameter by 1 ° from the input ports IN1
and IN2 toward the output port OT. Due to this diameter reduction as well, the directivity output
from the waveguide 21 is suppressed, for example, in the range of 10 ° or less in the vertical
direction.
[0045]
The speaker module 10 may be provided with a processor (not shown) and an amplifier (not
shown) on the processing side in front of the MF / HF drivers 41 and 42. The processor
separates an acoustic signal to be output as an acoustic signal for each frequency. For example, it
is separated into a high-pitched sound signal, a middle-pitched sound signal, and a low-pitched
sound signal. The high frequency range acoustic signal may be an acoustic signal of 6 kHz or
more. The low frequency range acoustic signal may be a 500 Hz to 6 kHz acoustic signal. The
low frequency range acoustic signal may be an acoustic signal below 500 Hz. A plurality of
amplifiers may be provided for the acoustic signal separated for each frequency to amplify the
sound pressure level of the acoustic signal.
02-05-2019
13
[0046]
FIG. 10A is a perspective view showing the appearance of the waveguide 21. FIG. FIG. 10B is a
view showing the shape of the waveguide 21 as viewed from above.
[0047]
The waveguide 21 has two curved resonance plates 23 and 24. Thereby, it is possible to secure a
certain horizontal directivity (for example, 90 ° directivity) in the horizontal direction. The space
formed in front of the resonance plates 23 and 24 in the speaker module 10 is narrow at a
position near the output port OT of the acoustic coupler 45 and gradually horizontal from the
output port OT of the acoustic coupler 45 in the traveling direction of the acoustic signal. It is
formed to expand the aperture ratio in the direction (to expand the space).
[0048]
The space between the resonance plates 23 and 24 serves as an input port for an acoustic signal
output from the MF / HF driver unit 40 disposed at the back of the waveguide 21. It also serves
as an output port for diffusing the acoustic signal from the waveguide 21 in the horizontal
direction and outputting it.
[0049]
Ribs 23z and 24z may be formed on the backs of the resonance plates 23 and 24, respectively.
The ribs 23z and 24z can reinforce the waveguide 21 and can suppress the generation of an
unintended vibration with respect to the pressure of the acoustic signal.
[0050]
On each surface of the resonance plates 23 and 24, for example, screw holes 23y and 24y for
fixing the waveguide 21 to the housing 10z of the speaker module 10 with screws are formed at
eight places.
02-05-2019
14
[0051]
The LF drivers 31 and 32 are attached to the outer sides (both sides in the horizontal direction of
the housing 10z) of the resonance plates 23 and 24, respectively.
By fixing the waveguide 21 to the housing 10z, the speaker module 10 can suppress the
generation of an unexpected sound due to the vibration of the sound.
[0052]
The waveguide 21 can change the output pattern of the acoustic signal in the horizontal
direction by adjusting the aperture ratio using the above-described resonance plates 23 and 24.
For example, the waveguide 21 may set the horizontal pointing angle to an angle other than 90
°, and the output pattern may be asymmetric with respect to the virtual axis AX2. As to the
directivity in the vertical direction, the contribution of the waveguide 21 is small, and the shapes
of the acoustic paths 47 and 48 in the acoustic coupler 45 largely contribute.
[0053]
Next, acoustic characteristics of the MF / HF driver unit 40 will be described.
[0054]
FIG. 11A is a distribution diagram showing sound pressure levels for each frequency in the
horizontal direction (horizontal directional direction) of the acoustic signal output from the MF /
HF driver unit 40. FIG.
FIG. 11B is a distribution diagram showing sound pressure levels for each frequency in the
vertical direction (vertical direction) of the acoustic signal output from the MF / HF driver unit
40. 11A and 11B show simulation results.
[0055]
02-05-2019
15
In FIGS. 11A and 11B, the horizontal axis indicates the frequency. The left vertical axis indicates
the angle of each measurement point with respect to an arbitrary point on the virtual axis AX2
indicating the acoustic center line of the acoustic signal output from the MF / HF driver unit 40.
Further, the vertical axis on the right side indicates the sound pressure level of the acoustic
signal output from the speaker module 10 in the case of using the frequency indicated on the
horizontal axis at the position of the angle indicated on the left vertical axis.
[0056]
The distance from an arbitrary point on the virtual axis AX2 to each measurement point may be
set to an equal distance (for example, radius 1 m, 3 m, 6 m), and a microphone may be disposed
at each measurement point. The sound pressure level may be measured by this microphone. In
FIG. 11A, each measurement point is disposed on a horizontal surface along the horizontal
direction. In FIG. 11B, each measurement point is arranged in a vertical plane along the vertical
direction.
[0057]
Here, specific examples of the relationship between the angle of each measurement point and the
sound pressure level (relative value) are shown in FIGS. 11C and 11D.
[0058]
In FIG. 11C, the centers of the circles coincide, and this center indicates an arbitrary point on the
imaginary axis AX2.
A point p11 on the circle r11 indicates the sound pressure level at an arbitrary point on the
virtual axis AX2, and this sound pressure level is 0 dB as a reference level. When the sound
pressure level at the measurement point is plotted on the circle r11, the sound pressure level is 0
dB. When the sound pressure level at the measurement point is plotted on the inside of the circle
r11 on the circle r11, it indicates that the sound pressure level is attenuated and less than 0 dB.
When the measurement results of the sound pressure level at each measurement point are
connected, a line m11 is obtained. In FIG. 11C, a plurality of circles having different radial
lengths in stages are shown, and the difference in the radial lengths of adjacent circles shows a
02-05-2019
16
difference of 10 dB. In other words, one memory shows 10 dB. In FIG. 11C, for example, it can be
understood that the position at which the angle of the measurement point (the angle with respect
to the traveling direction of the acoustic signal (upward in FIG. 11C)) is 50 ° is 6 dB attenuation
(-6 dB).
[0059]
FIG. 11C exemplifies that the frequency of the acoustic signal is 1 kHz, but in FIG. 11A, the
frequency of the acoustic signal is changed, and the result of measuring the sound pressure level
at each measurement point is shown. The frequency of the acoustic signal may be varied,
including, for example, the frequencies 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz.
[0060]
Similarly, in FIG. 11D, the centers of the circles coincide, and this center indicates an arbitrary
point on the imaginary axis AX2. A point p12 on the circle r12 indicates the sound pressure level
at an arbitrary point on the virtual axis AX2, and this sound pressure level is 0 dB as a reference
level. When the sound pressure level at the measurement point is plotted on the circle r12, the
sound pressure level is 0 dB. If the sound pressure level at the measurement point is plotted
inside the circle r12 on the inside of the circle r12, it indicates that the sound pressure level is
attenuated and is less than 0 dB. A line m12 is obtained by connecting the measurement results
of the sound pressure level at each measurement point. In FIG. 11D, a plurality of circles having
different radial lengths in stages are shown, and the difference in the radial lengths of adjacent
circles shows a difference of 10 dB. In other words, one memory shows 10 dB. In FIG. 11D, for
example, it can be understood that the position at which the angle of the measurement point (the
angle to the traveling direction of the acoustic signal (upward in FIG. 11D)) is 35 ° is 6 dB
attenuation (-6 dB).
[0061]
Although FIG. 11D exemplifies that the frequency of the acoustic signal is 1 kHz, in FIG. 11B, the
frequency of the acoustic signal is changed, and the result of measuring the sound pressure level
at each measurement point is shown. The frequency of the acoustic signal may be varied,
including, for example, the frequencies 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz.
02-05-2019
17
[0062]
In FIGS. 11A and 11B, the sound pressure level is indicated by color tone (gradation). In FIGS.
11A and 11B, the region where the sound pressure level is high is, for example, close to 3 dB,
and in the case of color, for example, the red component is high. 11A and 11B, the region where
the sound pressure level is low is, for example, close to -30 dB, and in the case of color, for
example, the blue component is high. For example, at 3 dB to -30 dB, the sound pressure level is
shown in the order of higher sound pressure levels, for example, red, yellow, green, bluish, and
purple. The points are shown in white.
[0063]
In FIG. 11A, when the frequency is 125 Hz, the sound pressure level is −6 dB or more at any
angle. When the frequency is 250 Hz, the sound pressure level is about -6 dB around an angle of
50 °. When the frequency is 500 Hz, the sound pressure level is about -6 dB around an angle of
50 °. When the frequency is 1 kHz, the sound pressure level is about -6 dB around an angle of
50 °. When the frequency is 2 kHz, the sound pressure level is approximately -6 dB around the
angle 48 °. When the frequency is 4 kHz, the sound pressure level is approximately -6 dB
around the angle 48 °. Basically, the lower the frequency, the higher the sound pressure level in
a wide angle range, and the higher the frequency from about 500 Hz, the constant sound
pressure level with respect to the angle. Also, the sound pressure level decreases as the angle
increases.
[0064]
In FIG. 11B, when the frequency is 125 Hz, the sound pressure level is −6 dB or more at any
angle. When the frequency is 250 Hz, the sound pressure level is about -6 dB at any angle. When
the frequency is 500 Hz, the sound pressure level is about -6 dB around an angle of 60 °. When
the frequency is 1 kHz, the sound pressure level is about -6 dB around an angle of 35 °. When
the frequency is 2 kHz, the sound pressure level is about -6 dB around an angle of 15 °. When
the frequency is 4 kHz, the sound pressure level is about -6 dB around an angle of 10 °.
Basically, the lower the frequency, the higher the sound pressure level in a wide angle range, and
the higher the frequency, the smaller the angular range in which the same sound pressure level
can be obtained. Also, the sound pressure level decreases as the angle increases.
02-05-2019
18
[0065]
Referring to FIG. 11A, in the entire frequency band including the frequency band of 500 Hz or
more, the horizontal angle for a region where the sound pressure level is relatively high (for
example, a region of −6 dB or more) falls within the range including ± 45 °. ing. That is, the
MF / HF driver unit 40 can provide an acoustic signal with a high sound pressure level in the
horizontal direction within a certain range in which the horizontal pointing angle is in the range
of about 90 °.
[0066]
Referring to FIG. 11B, in the frequency band of 500 Hz to 4 kHz, the angle in the vertical
direction with respect to a region where the sound pressure level is relatively high (e.g., a region
of -6 dB or more) may extend to ± 5 ° or more. The interference of the acoustic signal between
the MF / HF driver units 40 depends on the distance between the plurality of MF / HF driver
units 40. This is similar to the occurrence of phase shift depending on the distance between the
LF drivers 31 and 32. However, in the present embodiment, two MF / HF driver units 40 are
disposed close to each other (see FIGS. 8 and 9), and the phase shift occurs in the frequency band
where the distance between MF / HF driver units 40 is 4 kHz or less It becomes an acceptable
range of Therefore, in the frequency band of 500 Hz to 4 kHz, even if the angle in the vertical
direction is not within the range of ± 5 °, the influence on the phase shift is small.
[0067]
The frequency band where the influence on the phase shift starts to increase is a frequency band
of about 4 kHz. Here, referring to FIG. 11, in the frequency band of about 4 kHz or more, the
vertical angle for a region where the sound pressure level is relatively high (for example, a region
of −6 dB or more) falls within the range of about ± 5 ° . Thus, the interference between the
adjacent MF / HF driver units 40 is reduced. That is, the MF / HF driver unit 40 has an acoustic
signal with a high vertical sound pressure level and an acoustic signal with a small phase shift
within a certain range of a vertical directivity angle of about 10 ° in a frequency band of 500 Hz
or more. It can provide a signal.
[0068]
02-05-2019
19
In any of FIGS. 11A and 11B, the lower the frequency band, the less the directivity, and the
acoustic signal is transmitted at a high sound pressure level with respect to any horizontal angle
and vertical angle. I understand that.
[0069]
Further, referring to FIG. 11B, when observing the relationship between the frequency and the
vertical pointing angle, it can be understood that the directivity is narrower as the frequency
region is higher.
[0070]
Further, in the high frequency region, there are no discontinuous locations where the sound
pressure level becomes high in the region showing the low angle of the sound pressure level in
the distribution diagram of FIG. 11B.
Therefore, it can be understood that the side lobes of the acoustic signal are minimized in the
vertical direction, and the quality of the acoustic signal is high.
Therefore, even when the speaker modules 10 are vertically connected to form the speaker array
5, the speaker array 5 can reduce side lobe disturbance and suppress an increase in phase
interference. This is also true in the horizontal direction.
[0071]
FIG. 12A is a diagram representing a three-dimensional position at which the horizontal
directional pattern (the directional pattern in the horizontal direction) from the acoustic coupler
45 to the waveguide 21 is measured in a mesh shape. FIG. 12B is a distribution diagram showing
horizontal phase characteristics at respective three-dimensional positions from the acoustic
coupler 45 to the waveguide 21 by color distribution.
[0072]
02-05-2019
20
As shown in FIG. 12B, in the acoustic coupler 45 and in the area surrounded by the waveguide
21 on the outside of the waveguide 21, a stripe pattern repeating at a constant period appears.
This stripe pattern indicates that the signal level of the acoustic signal at each three-dimensional
position changes regularly. If a phase shift occurs, a portion in which the signal level of the
acoustic signal at each three-dimensional position changes irregularly occurs. Therefore, it can be
understood that the phase shift is small for both the acoustic signal passing through the acoustic
coupler 45 and the acoustic signal output through the output port OT of the waveguide 21.
[0073]
FIG. 13 is a graph showing the horizontal pointing angle (measurement value) for each frequency
of the acoustic signal output from the MF / HF driver unit 40 of the present embodiment. The
horizontal axis indicates the frequency of the acoustic signal. The vertical axis indicates the
horizontal pointing angle of the acoustic signal.
[0074]
In FIG. 13, the broken line e1 is a line indicating that the horizontal pointing angle is 90 ° in the
entire frequency band, that is, the ideal value of the horizontal pointing angle. In measurement of
an acoustic signal, a sound pressure level is measured by the method similar to FIG. 11A. A
horizontal pointing angle is derived based on the sound pressure level measured at each
measurement point, and is taken as the value of the horizontal pointing angle in FIG.
[0075]
A line connecting horizontal directivity angles for each frequency at which a sound pressure level
of -6 dB can be obtained is a line of -6 dB contour and is shown by a graph g1. That is, an angle
of a portion attenuated by 6 dB with respect to the sound pressure level on the acoustic center
line (coincident with virtual axis AX2) of MF / HF driver unit 40 is derived for each frequency,
and the connected line has a -6 dB contour. It becomes a line of Similarly, a line connecting
horizontal directivity angles for each frequency at which a sound pressure level of -3 dB can be
obtained is a line of -3 dB contour and is shown by a graph g2. A line connecting horizontal
directivity angles for each frequency at which a sound pressure level of -9 dB is obtained is a line
of -9 dB contour, and is shown by a graph g3.
02-05-2019
21
[0076]
In FIG. 13, in the frequency band of 200 Hz to 10 kHz, the broken line e1 indicating the ideal
value substantially matches the graph g11 indicating the −6 dB contour. And this corresponding
horizontal pointing angle is 90 °. Therefore, the speaker module 10 can reduce the loss of
acoustic energy and emit an acoustic signal by adjusting the acoustic signal output from the
waveguide 21 to be 90 °.
[0077]
FIG. 14A is a graph showing the horizontal directivity angle (measured value) for each frequency
of the acoustic signal output from the acoustic driver in Comparative Example 1. The horizontal
axis indicates the frequency of the acoustic signal. The vertical axis indicates the horizontal
pointing angle. Similarly, FIG. 14B is a graph showing the horizontal pointing angle (measured
value) for each frequency of the acoustic signal output from the acoustic driver in Comparative
Example 2. The horizontal axis indicates the frequency of the acoustic signal. The vertical axis
indicates the horizontal pointing angle.
[0078]
In FIG. 14A, a line indicating an ideal value is indicated by a broken line e11. A line of -6 dB
contour is shown by the graph g11. A line of -9 dB contour is shown by the graph g12. A line of 3 dB contour is shown by the graph g13. In FIG. 14B, a line indicating an ideal value is indicated
by a broken line e21. A line of -6 dB contour is shown by the graph g21. A line of -9 dB contour
is shown by the graph g22. A line of -3 dB contour is shown by the graph g23.
[0079]
The configurations of Comparative Examples 1 and 2 are both different from the configuration of
the MF / HF driver unit 40 of the present embodiment. That is, in Comparative Examples 1 and 2,
the MF / HF driver unit 40 is not provided, and in particular, the acoustic coupler 45 is absent.
Therefore, the device concerning the length and the angle of the sound paths 47 and 48 as in the
present embodiment is not made. On the other hand, the MF / HF driver unit 40 of the present
02-05-2019
22
embodiment includes the acoustic coupler 45, and the device concerning the length and angle of
the acoustic paths 47 and 48 is made.
[0080]
Thus, in the speaker module 10 according to the present embodiment, the graph of the -6 dB
contour has characteristics close to the ideal value indicated by the broken line, as compared
with the comparative examples 1 and 2. Therefore, in the present embodiment, it can be
understood that the horizontal pointing angle at which high acoustic energy can be obtained is as
close to 90 ° at 200 Hz to 10 kHz as in Comparative Examples 1 and 2. The speaker module 10
can reduce the loss of acoustic energy and emit an acoustic signal by adjusting the acoustic
signal output from the waveguide 21 to be 90 degrees.
[0081]
FIG. 15 is a graph showing the vertical pointing angle (measurement value) for each frequency of
the acoustic signal output from the MF / HF driver unit 40 of the present embodiment. The
horizontal axis indicates the frequency of the acoustic signal. The vertical axis indicates the
vertical pointing angle of the acoustic signal. The vertical axis indicates the vertical pointing
angle.
[0082]
In measurement of an acoustic signal, a sound pressure level is measured by the method similar
to FIG. 11B. Based on the sound pressure level measured at each measurement point, the vertical
pointing angle is derived, and is taken as the value of the horizontal pointing angle in FIG.
[0083]
In FIG. 15, a line of -6 dB contour is shown by a graph g31. A line of -9 dB contour is shown by
the graph g32. A line of -3 dB contour is shown by the graph g33. Referring to FIG. 15, it can be
understood that as the frequency is higher at 500 Hz to 6 KHz, in the graph g31 of the -6 dB
contour, the vertical directivity angle becomes uniform at about 10 °.
02-05-2019
23
[0084]
As described above, the speaker module 10 can reduce the phase shift and realize good phase
characteristics by shortening the acoustic center distance of each acoustic driver. The speaker
module 10 can realize constant directivity in the horizontal direction with respect to a frequency
band higher than the midrange by providing the waveguide 21 having a curvature that realizes
appropriate horizontal directivity. Therefore, the speaker module 10 can construct an acoustic
characteristic with less uniform phase disturbance within, for example, a range of 90 ° in the
horizontal direction and 10 ° in the vertical direction as a cover area. The shape of the
waveguide 21 having the above-described curvature may be derived, for example, by a
predetermined functional equation.
[0085]
In addition, the speaker module 10 can make the vertical pointing angle be, for example, 10 ° or
less by accurately coupling the plurality of MF / HF drivers 41 and 42 in the acoustic coupler 45,
for example, and the power handling is high (for example, 600 W for MF) It can be 300 W) with
HF.
[0086]
In addition, the speaker module 10 uses the coaxial type MF / HF drivers 41 and 42, so that the
acoustic center distance between the MF driver and the HF driver becomes a value of 0 and
becomes minimum, so the occurrence of phase shift is maximized. It can be suppressed.
Therefore, the speaker module 10 can eliminate the need for providing separation for separating
the sound ranges as in the patent document 1.
[0087]
In addition, the speaker array 5 may be formed by connecting the speaker modules 10 in the
vertical direction. By setting the vertical directivity angle to, for example, 10 ° or less in the
entire frequency band, the acoustic signal can be transmitted to a predetermined horizontal
02-05-2019
24
coverage range with little spread in the vertical direction in the entire frequency band. Therefore,
the speaker array 5 can largely suppress the interference between the acoustic signals outputted
by the respective speaker modules 10 of the speaker array 5, and can realize the speaker array
having good acoustic characteristics.
[0088]
The speaker module 10 and the speaker array 5 may be used in situations where large scale and
large signal level acoustic signals are required, such as a concert hall or a large capacity stadium.
[0089]
As described above, in the speaker module 10, the MF / HF driver unit 40 includes the MF / HF
drivers 41 and 42 (an example of the first acoustic driver) and the acoustic coupler 45.
The MF / HF drivers 41 and 42 respectively output a plurality of middle to high-range sound
signals (an example of a first sound signal). The acoustic coupler 45 has acoustic paths 47 and
48. The sound paths 47 and 48 input the plurality of middle to high-range sound signals output
from the MF / HF drivers 41 and 42 to the plurality of input ports IN1 and IN2, respectively. The
sound paths 47 and 48 guide the plurality of middle to high-range sound signals input to the
plurality of input ports IN1 and IN2 to the common output port OT. The sound paths 47 and 48
combine the plurality of middle to high range sound signals at a common output port OT to
generate a combined sound signal (an example of a second sound signal). The acoustic paths 47
and 48 include an acoustic coupler 45 having acoustic paths 47 and 48 for outputting the
generated second acoustic signal. The lengths from the plurality of input ports IN1 and IN2 to
the common output port OT in the acoustic paths 47 and 48 are equal to each other.
[0090]
Thereby, since the speaker module 10 outputs an acoustic signal using a plurality of acoustic
drivers like the MF / HF drivers 41 and 42, large acoustic energy can be acquired. Further, since
the lengths of the respective acoustic paths 47 and 48 in the acoustic coupler 45 are equalized,
the lengths to which the acoustic signal is transmitted in all frequency bands are the same.
Therefore, the speaker module 10 can suppress the phase shift of the acoustic signal in the entire
frequency band. Therefore, the speaker module 10 can reduce the phase shift of the acoustic
signal output from each of the MF / HF drivers 41 and 42, and can secure large acoustic energy.
02-05-2019
25
[0091]
In the acoustic coupler 45, even if acoustic signals from a plurality of acoustic drivers are
combined, deterioration of the phase characteristic is suppressed at the reproduction frequency
by the speaker module 10. When the reproduction frequency is the entire frequency range, the
phases become the same in the entire frequency range if the lengths of the plurality of acoustic
paths 47 and 48 are the same.
[0092]
Further, a part of the acoustic paths 47 and 48 may be reduced in diameter in the vertical
direction from the input ports IN1 and IN2 toward the output port OT. The vertical direction may
be a direction orthogonal to the horizontal direction (arrangement direction in which the MF /
HF drivers 41 and 42 are arranged). The ceilings F3 and the bottoms F4 of the acoustic passages
47, 48 (an example of the inner wall in the vertical direction of the acoustic passages 47, 48) of
the acoustic passages 47, 48 are virtual axes AX1 (an example of a first imaginary axis) ) May
have an angle of 1 °. The virtual axis AX1 indicates the acoustic center line (an example of the
first acoustic center) of the middle to high tone acoustic signal passing through the acoustic
paths 47 and 48.
[0093]
As a result, since the angle in the vertical direction in the sound paths 47 and 48 is narrowed in
the speaker module 10, the sound signal can be prevented from spreading in the vertical
direction. The speaker module 10 can have, for example, a vertical directivity angle of 10 ° or
less. In addition, since the acoustic signal travels through the acoustic paths 47 and 48 in the
same phase, the acoustic energy of the acoustic signal can be transmitted constant. Further, since
the arrival time of the acoustic coupler 45 to the output port OT is also the same, the speaker
module 10 can suppress the phase shift for each frequency. Therefore, in the speaker module 10,
even when the speaker module 10 is connected in the vertical direction to form the speaker
array 5, it becomes difficult for the acoustic signals output from the speaker module 10 adjacent
in the vertical direction to interfere with each other. Deterioration can be suppressed.
02-05-2019
26
[0094]
Further, a part of the sound paths 47 and 48 may be reduced in diameter in the horizontal
direction from the input ports IN1 and IN2 toward the output port OT. MF / HF drivers 41 and
42 may be attached to the innermost inner surface (inner wall surface) F1 in the arrangement
direction of the acoustic paths 47 and 48. Further, the side face F1 may have an angle of 96 °
with respect to the end faces 51a and 52a located outside the input ports IN1 and IN2 in the
attachment parts 51 and 52 forming the input ports IN1 and IN2.
[0095]
As a result, the speaker module 10 restricts the horizontal angle in the sound paths 47 and 48,
so that the sound signal can be prevented from spreading in the horizontal direction by a certain
angle or more. The speaker module 10 can have, for example, a horizontal pointing angle of 90
° or less according to the horizontal angle in the sound paths 47 and 48. In addition, since the
acoustic signal travels through the acoustic paths 47 and 48 in the same phase, the acoustic
energy of the acoustic signal can be transmitted constant. Further, since the arrival time of the
acoustic coupler 45 to the output port OT is also the same, the speaker module 10 can suppress
the phase shift for each frequency.
[0096]
In addition, the speaker module 10 may include the LF drivers 31 and 32 (a plurality of second
acoustic drivers). The LF drivers 31 and 32 may output a bass acoustic signal (one example of a
third acoustic signal) whose frequency is lower than that of the middle and high tone acoustic
signals. The distance between the output ports 31z and 32z (an example of the second output
port) where the low frequency range acoustic signals are output from the LF drivers 31 and 32,
respectively, is based on the frequency band (for example, 500 Hz) of the low frequency range
acoustic signals. May be determined.
[0097]
Thereby, the speaker module 10 can shorten the acoustic center distance of the LF drivers 31
and 32 based on the frequency band, for example, making the phase difference of the acoustic
02-05-2019
27
signals output from the LF drivers 31 and 32 within 90 °. Can. In this case, the speaker module
10 does not have an opposite phase between the plurality of low-range sound signals, and can
suppress reduction in sound energy.
[0098]
In addition, the LF drivers 31 and 32 are configured for virtual axes AX3a and AX3b (an example
of a second virtual axis) indicating an acoustic center line (an example of a second acoustic
center) to which an acoustic signal in a low range is transmitted. It may be disposed at an angle
of 8 ° in the direction in which the output ports 31z, 32z approach.
[0099]
As a result, in the speaker module 10, the output ports 31z and 32z of the LF drivers 31 and 32
approach each other, and the acoustic center distance of the LF drivers 31 and 32 can be
shortened.
Therefore, the speaker module 10 can make it hard to generate | occur | produce phase shift of
several 3rd acoustic signals.
[0100]
Here, the frequency band of the acoustic signal handled by the LF drivers 31 and 32 is 500 Hz or
less, and the same frequency band is exemplified. However, different frequency bands may be
handled. For example, the LF drivers 31 and 32 may function as a lower band (for example, 250
Hz or less) LF driver and a higher band (for example, 250 Hz to 500 Hz) LF driver. Thereby, a 4way speaker system can be constructed. Further, the speaker module 10 divides the frequency
band of the acoustic signal handled by the two LF drivers 31 and 32 to disperse the frequency
band handled by the LF drivers 31 and 32. Therefore, the acoustic center distance of the LF
drivers 31 and 32 Even if it is somewhat longer, it is difficult for the phase shift to occur and
phase interference can be reduced.
[0101]
[Repeat Description and Supplement to Speaker Array] Hereinafter, the speaker module 10 and
the speaker array 5 of the present embodiment will be described in other words and
02-05-2019
28
supplements.
[0102]
The present embodiment describes a professional loudspeaker system (e.g. a loudspeaker array
5).
Loudspeaker systems are used in a variety of applications that require loudspeaker systems with
high acoustical characteristics along with superior vertical and horizontal radio characteristics.
Also, loudspeaker systems have excellent phase response and can be used in any type of venue,
from small to large.
[0103]
This embodiment applies to a family of loudspeakers known among traders and is well known to
those skilled in the art as line array loudspeakers (e.g. loudspeaker array 5).
[0104]
Line array loudspeakers, which are well known among traders, are non-spherical in order to
properly combine the vertical elements and also to produce excellent phase-frequency responses
in the near and far regions. Require a planar wavefront along the vertical direction of
[0105]
The system is a vertical line array speaker element (e.g., speaker module 10).
Many such systems are used in vertical combinations and require a good sound supply in venues
requiring speech, film, live music and other sound amplification applications. Generate
The system covers an audio frequency range of approximately 45 Hz to 20 KHz. A frequency
range below this is also envisioned and covered by the operations included here.
02-05-2019
29
[0106]
The system is a 3-way loudspeaker system. The 3-way loudspeaker system has three bandwidths
covering the low frequency, intermediate frequency and high frequency parts of the speech
spectrum via low frequency, intermediate frequency and high frequency devices. Intermediate
frequency and high frequency devices (e.g. MF / HF drivers 41, 42) are included in the coaxial
set of electroacoustic drivers (e.g. MF / HF driver unit 40). In addition, this embodiment is
applicable to a two-way system or a four-way system, including active, passive or combined,
crossover system, adopting from two or three amplification subsystems. is important. It operates
in a band separation manner via the above mentioned crossover system and also operates the
low frequency section, the intermediate frequency section, the high frequency section or any
combination of these sections of the loudspeaker.
[0107]
The prior art uses many means to generate the required planar wavefront. A planar wavefront is
required for the vertical line array system (e.g. speaker array 5) and the vertical line array system
elements (e.g. speaker module 10).
[0108]
This embodiment uses a specific two-way coaxial flat driver (e.g., MF / HF driver unit 40) from
BMS Company. The two-way coaxial planar driver includes intermediate frequency elements and
high frequency elements coaxially with means for generating a planar wavefront. Both
wavefronts exist via a common acoustic port (eg, output port OT) as one part. Other products are
available and applicable to designs as described herein.
[0109]
Such coaxial planar drivers are known to those skilled in the art of line array loudspeaker system
design.
[0110]
02-05-2019
30
The novel and unique design taught and described herein is unique to such coaxial planar drivers
in order to generate more acoustic energy while maintaining a planar wavefront with superior
frequency and phase characteristics. Used for
This design comprises means coupled to the waveguide of the planar wavefront and coupling low
frequency transducers (e.g. LF drivers 31, 32) in the means defining the novel line array
loudspeaker element. Some of this design is used by those skilled in the art to generate variations
of these designs. Such systems are envisioned and are included as part of the spirit and scope
herein.
[0111]
Prior art systems use various means to combine three band pass (low frequency, intermediate
frequency and high frequency) in acoustic space.
[0112]
The various means described above are well known to the person skilled in the art and have
varying degrees of success.
[0113]
The idea of the system is to improve various key aspects using new or new implementation
means.
The points of improvement include the following.
[0114]
-Inherent enhancement means increase the sensitivity and power of the intermediate frequency
range and high frequency range handled by the coupling of multiple coaxial planar drivers so
that the acoustic energy combines the acoustic energy without destructive interference.
The increasing means increases the sensitivity and power to increase the acoustic output while
02-05-2019
31
maintaining the integrity of the acoustic plane wavefront while maintaining excellent phasefrequency response.
[0115]
-A unique planar coaxial driver is used which supplies a common coupling throat and a common
waveguide.
[0116]
-Intrinsic coupling means close to the mid frequency range and high frequency range waveguides
with minimal low frequency interference while maintaining good coupling to maintain the
horizontal emission of the low frequency driver Combine integrated low frequency transducers.
(As taught herein, the system may be used as a four-way system by transmitting separate
bandlimited information to each woofer (e.g., LF driver 31, 32). Only at very low frequencies,
both low frequency drivers are used, thereby improving low intermediate frequency and low
frequency horizontal coverage. )
[0117]
The intrinsic reduction means reduce the driver to driver isolation. This improves the phase and
frequency response of the system. This system is a system as a whole including low frequency
elements coupled to an intermediate frequency / high frequency coaxial element.
[0118]
The system uses a coaxial type speaker configuration for the mid frequency range and the high
frequency range. Satisfactory phase characteristics are realized by reducing the difference in
acoustic center distance of each coaxial unit.
[0119]
02-05-2019
32
Fixed horizontal directivity is achieved for intermediate and high frequencies by constructing a
horn shape with a bend that achieves proper and required horizontal directivity. In this case, any
suitable horizontal pattern may be reasonably obtained by the embodiment and is also within the
scope of the embodiments taught herein.
[0120]
The present embodiment implements a loudspeaker system design that has uniform (ideal phase
response) acoustical properties that are uniform with little or no phase impairment in coverage
in the vertical and horizontal regions.
[0121]
This embodiment applies in particular to systems that utilize a unique plane wave coupler
coupled to a plane waveguide.
The system thereby efficiently generates a planar wavefront of a particular dimension for use as
part of a line array speaker element.
[0122]
It will be apparent to those skilled in the art that the coupler can be used as a diffractive slot
device without a waveguide in order to easily generate a device that covers a wide range in the
horizontal direction.
[0123]
Line array speaker elements are comprised of a plurality of drivers:-two X12 cone drivers-four
(arranged into two of the two patterns) coaxial drivers
[0124]
A person skilled in the art can easily conceive that other configurations are easily derived based
on the teachings herein and are envisioned as part of this embodiment.
[0125]
02-05-2019
33
This embodiment will be described in more detail below, by way of example.
[0126]
1. By adopting a plane wave coaxial driver, two drivers are connected so that the phase is in
phase by setting the horizontal angle to 41 ° to 43 ° through the use of an acoustic path called
a coupler.
By combining the vertically connected coupler and driver, the directivity in the vertical direction
can be made 10 ° or less.
The composition of the acoustic energy transmitted to the waveguide through the coupler is one
that emits acoustic energy.
[0127]
2.
The two drivers are connected up and down, and the coaxial plane wave driver is combined to
realize a unit with high sensitivity and high power operation.
A coaxial plane wave driver is a total of four pieces.
[0128]
3. For the coupler, it is designed to have an inclination angle of 96 ° as the acoustic path on the
horizontal internal side. Also, it is designed to have an inclination angle of -1 ° in the vertical
direction, so as to decrease slightly directly in the same phase in the vertical direction.
[0129]
02-05-2019
34
4. With regard to the waveguide, it has a narrow space at a position near the acoustic center, and
by gradually expanding the aperture rate from there in the horizontal direction, it is possible to
maintain a certain horizontal characteristic.
[0130]
5.
As a 3-way (low frequency, intermediate frequency, high frequency) line array speaker, the
distance between the drivers of the LF unit, the MF unit, and the HF unit is configured such that
the radius is between 260 cm and 280 cm. In addition, 2 ways or 4 ways may be sufficient. The
system may be implemented with different sized low frequency drivers and different amounts of
coaxial or non-coaxial drivers. The present system is envisioned as part of this embodiment and
is included as part of this embodiment.
[0131]
6. In order to reduce the distance difference (phase and frequency interference) between the LF
unit and the MF / HF unit (for example the MF / HF driver unit 40), the LF unit is inclined 8 °
and has acoustically satisfactory characteristics To achieve. Other angles may be used and are
included in this embodiment.
[0132]
It is noted that non-coaxial plane wave drivers are usable in the present system and are within
the scope of the present embodiment.
[0133]
By having the above-described features, it is possible to realize a speaker system having
characteristics that provide extremely small phase disturbance and excellent frequency response.
02-05-2019
35
Also, uniform horizontal and vertical characteristics are realized. This characteristic includes the
vertical characteristic of 10 ° or less (the directivity angle required for a line array speaker). In
addition, the speaker system has high power operation (MF: 600 W, HF: 300 W, from the unit of
the specification of AES) by connecting four drivers by couplers exactly. It is noted that other
designs are envisioned, including vertical ranges of 10 degrees or less, including vertical ranges
of 10 degrees or more, and may be included as part of the scope of the embodiments.
[0134]
The views of the coupler shown in FIGS. 4 and 5 (this view shows the angles) show one half of
the design. This design is described to include four drivers in all, two in a row. All share devices
of the same binding, as shown below, or like other similar assemblies.
[0135]
A drawing of a waveguide is shown in FIGS. 10A and 10B.
[0136]
The details of the unit layout (distance between two LF drivers: 260 cm to 280 cm) are shown in
FIG.
[0137]
11A and 11B show the vertical and horizontal coverage of the line array speaker, suggesting
excellent coverage in the horizontal and vertical frequency response.
FIG. 11A shows the angle in the horizontal direction (predicted value).
FIG. 11B shows the vertical angle (predicted value)
[0138]
12A and 12B serve to illustrate the superior properties of the waveguide connected to the
coupler.
02-05-2019
36
[0139]
FIG. 12A is a mechanical design showing one half of the waveguide.
FIG. 12B shows the same field of view as the waveguide of FIG. 12A and helps to show the
excellent phase response of the system. This phase characteristic is illustrated by the color band
of nearby straight acoustic energy as waveguide propagation and departure.
[0140]
Figures 13, 14A and 14B serve to compare the present system with two competing and other
similar systems. The loudspeaker is shown in FIG. 13 as RAMSA WS-LA4. A line passing through
the horizontal center in FIG. 13 (for example, a broken line e1) indicates a satisfactory speaker.
The upper and lower sides of the above line in FIG. 13 are out of perfect shape. In the case of
WS-LA4, comparing the two competing speakers shows a very small deviation, which helps to
highlight the successful design and operation of the embodiment.
[0141]
Second Embodiment The first embodiment exemplifies a 3-way speaker system including an LF
driver, an MF driver, and an HF driver (in fact, an MF / HF driver unit). In the second
embodiment, a two-way speaker system including an LF driver and an HF driver will be mainly
described.
[0142]
In the speaker module according to the second embodiment, the description of the same
components as those of the first embodiment will be omitted or simplified by using the same
reference numerals.
[0143]
02-05-2019
37
FIG. 16 is a view showing an example of the appearance of the speaker array 105 in the second
embodiment.
The speaker array 105 includes a plurality of speaker modules 110 connected in a line. The
housing 110z of each speaker module 110 is adjacent to and integrated with the housing 110z
of the upper and lower speaker modules 110 on the upper surface and the lower surface,
respectively. As in the first embodiment, the speaker array 105 has a variable range covering the
vertical direction by combining the speaker modules 110 in a line. Further, the angle at which
the speaker array 105 disperses the acoustic signal in the horizontal direction is constant.
[0144]
FIG. 17A is a front view showing the appearance of the speaker module 110. FIG. FIG. 17B is a
side view showing the appearance of the speaker module 110. As shown in FIG. The speaker
module 110 has a substantially rectangular parallelepiped housing 110z. A waterproof sheet 111
having a water repelling power is provided on the front of the housing 110z to prevent the
intrusion of rain or the like. A handle 113 for gripping the speaker module 110 is attached to the
front of the side surface of the housing 110z.
[0145]
FIG. 18 is a cross-sectional view showing an example of the structure of the speaker module 110.
As shown in FIG. FIG. 18 shows a cross section of the housing 110z of the speaker module 110
cut in the horizontal direction (longitudinal direction of the housing). A waveguide 121 is
disposed at the center of the front surface of the housing 110z.
[0146]
The speaker module 110 has an LF driver 131, 132 for outputting an acoustic signal in a low
frequency range of 1 kHz or less, and an HF driver 140 for outputting an acoustic signal in a
high frequency range exceeding 1 kHz. Unlike the speaker module 10 of the first embodiment,
the speaker module 110 does not have an acoustic coupler.
02-05-2019
38
[0147]
At the back of the waveguide 121, the HF drivers 140 are arranged in two upper and lower
stages (two stages in the vertical direction). The HF driver 140 is, for example, a 1.75 inch
speaker. The HF driver 140 outputs a high-pitched acoustic signal in front of the housing 110z.
The waveguide 121 uniformly diffuses the high frequency range acoustic signal output from the
HF driver 140 in the horizontal direction of the housing 110 z.
[0148]
The LF drivers 131 and 132 are disposed on both sides of the front surface of the housing 110 z
sandwiching the waveguide 121. The LF drivers 131 and 132 are, for example, 8-inch acoustic
drivers. The LF drivers 131 and 132 output an acoustic signal in the low frequency range in
front of the housing 110 z. The sound signal in the low frequency range output from the LF
drivers 131 and 132 has low directivity. For example, the sound signals can be output from the
back of the LF drivers 131 and 132. Here, the number of LF drivers is two, but may be three or
more.
[0149]
Rear passages 115 and 116 are formed on the front surface of the housing 110z using the bass
reflex port BP2. The rear passages 115 and 116 communicate with the backs of the LF drivers
131 and 132, and guide the low-range acoustic signals output from the LF drivers 131 and 132
to the front of the housing 110z.
[0150]
The HF driver 140 and the two LF drivers 131 and 132 may be arranged symmetrically in the
horizontal direction (for example, in the left and right direction in FIG. 18) with reference to the
MF / HF driver unit 40. In this case, the center line (sound center line) of the sound signal output
from the speaker module 110 coincides with the sound center line of the high sound range
sound signal output from the HF driver 140. The acoustic center line of the high-range acoustic
signal output from the HF driver 140 is shown as a virtual axis AX12.
02-05-2019
39
[0151]
A predetermined position on the sound center line of the speaker module 10 is set as a sound
center position sc2 (see FIG. 18). The predetermined position is, for example, a position at which
the virtual axis AX12 intersects with the middle line of the waveguide 121.
[0152]
The distance from the sound center position sc2 to the output ports 131z and 132z of the LF
drivers 131 and 132 may be determined based on the frequency band of the sound signal in the
bass range.
[0153]
Specifically, when the frequency band of the low frequency range acoustic signal is 1 kHz or less,
the output ports 131z and 132z of the LF drivers 131 and 132 have a circumference with a
radius of 165 mm to 175 mm (169 mm as an example) from the acoustic center position sc2. It
is placed on r2.
For example, when the frequency of the low frequency range acoustic signal is 1 kHz, 1⁄4 · λ,
which is an allowable range of phase shift, is approximately 9 cm. Therefore, the acoustic center
distance may be set with this value as a guide.
[0154]
Further, in the LF drivers 131 and 132, the virtual axes AX13 (AX13a and AX13b) indicating the
acoustic center line of the sound signal in the low range may be inclined by 10 ° with respect to
the virtual axis AX12. That is, the LF drivers 131 and 132 may be disposed at an angle of 10 °
in the direction in which the output ports 131z and 132z of the LF drivers 131 and 132
approach each other with respect to the virtual axes AX13a and AX13b. Thus, by inclining the
output ports of the LF drivers 131 and 132 inward, the output ports 131z and 132z come closer,
and the distance between the output ports 131z and 132z of the LF drivers 31 and 32 can be
shortened. The acoustic center distance of 131, 132 can be shortened. Therefore, it is possible to
02-05-2019
40
reduce the phase shift between the sound signals in the low frequency range outputted from the
LF drivers 131 and 132. The tilt angle of 10 ° may be determined according to the size of the
housing 110z and the frequency of the acoustic signal.
[0155]
The LF drivers 131 and 132 have a larger angle of 10 ° than the angle 8 ° in the first
embodiment, so the acoustic center distance is shorter than that of the LF drivers 31 and 32.
Since the LF drivers 131 and 132 output acoustic signals in the low frequency band of 1 kHz or
less, they output acoustic signals including a higher frequency range than the LF drivers 31 and
32, but shortening the acoustic center distance increases the phase shift. It can be suppressed. In
addition, the LF drivers 131 and 132 can minimize side lobes and improve acoustic
characteristics by suppressing an increase in phase shift.
[0156]
FIG. 19A is a perspective view showing the appearance of the waveguide 121. FIG. FIG. 19B is a
cross-sectional view showing the shape of the waveguide 121 as viewed in the direction of arrow
FF in FIG. 19A.
[0157]
The waveguide 121 has two curved resonance plates 123 and 124. Thereby, it is possible to
secure a certain horizontal directivity (for example, 90 ° directivity) in the horizontal direction.
The space formed in front of the resonance plates 123 and 124 in the speaker module 110 is
narrow at a position near the output port of the HF driver 140, and gradually increases in the
horizontal direction from the output port of the HF driver 140 toward the traveling direction of
the acoustic signal. It is formed to expand the aperture ratio (to expand the space).
[0158]
The space between the resonance plates 123 and 124 serves as an input port for an acoustic
signal output from the HF driver 140 disposed at the back of the waveguide 121. It also serves as
02-05-2019
41
an output port for diffusing and outputting an acoustic signal from the waveguide 121 in the
horizontal direction.
[0159]
A protrusion 125 is formed between the resonance plates 123 and 124. The protrusions 125
may function as partitions dividing the vertical direction and may function as acoustic coupling
ports. In addition, the protrusions 125 help smooth and connect the wavefronts of the two
acoustic signals output from the two HF drivers 140 arranged in the vertical direction, and can
suppress the interference of the two acoustic signals.
[0160]
For example, screw holes 123y and 124y for fixing the waveguide 121 to the housing 110z of
the speaker module 110 are formed at six places on each surface of the resonance plates 123
and 124, for example. On the inner side of the back surface of the resonance plates 123 and 124,
the HF driver 140 is attached to upper and lower two stages (two stages in the vertical direction).
In addition, LF drivers 131 and 132 are attached to the back outer sides (both sides in the
horizontal direction of the housing 110z) of the resonance plates 123 and 124, respectively.
[0161]
The upper plate 121 w and the lower plate 121 v for reinforcing the waveguide 121 are
connected to the resonance plates 123 and 124. The upper plate 121 w and the lower plate 121
v can suppress the spread of sound in the vertical direction. In addition, the inner surfaces of the
upper plate 121 w and the lower plate 121 v may be formed into tapered surfaces that slightly
expand outward (in the direction of travel of the acoustic signal). By slightly inclining the upper
plate 121 w and the lower plate 121 v, the vertical connection (summation) of the acoustic signal
emitted from the waveguide 121 is improved. Therefore, it becomes difficult for the acoustic
signal output from the speaker module 110 to give phase interference to the acoustic signal
output from the adjacent speaker module.
[0162]
02-05-2019
42
FIG. 20 is a graph showing the horizontal pointing angle (measurement value) for each frequency
of the acoustic signal output from the HF driver 140 of the present embodiment. The horizontal
axis indicates the frequency of the acoustic signal. The vertical axis indicates the horizontal
pointing angle of the acoustic signal. The method of measuring the acoustic signal is the same as
in the first embodiment.
[0163]
In FIG. 20, a line indicating an ideal value is indicated by a broken line e4. A line of -6 dB contour
is shown by the graph g41. A line of -9 dB contour is shown by the graph g42. A line of -3 dB
contour is shown by the graph g43. Referring to FIG. 20, it can be understood that in the
frequency band of 1 kHz or more, the graph g41 indicating the -6 dB contour is uniform at a
horizontal directivity angle of about 90 °. Therefore, the speaker module 110 can reduce the
loss of acoustic energy and emit an acoustic signal by adjusting the acoustic signal output from
the waveguide 121 to be 90 degrees.
[0164]
FIG. 21 is a graph showing the vertical pointing angle (measurement value) for each frequency of
the acoustic signal output from the HF driver 140 of the present embodiment. The horizontal
axis indicates the frequency of the acoustic signal. The vertical axis indicates the vertical pointing
angle of the acoustic signal. The method of measuring the acoustic signal is the same as in the
first embodiment.
[0165]
In FIG. 21, a line of -6 dB contour is shown by a graph g51. A line of -9 dB contour is shown by
the graph g52. A line of -3 dB contour is shown by the graph g53. Referring to FIG. 21, it can be
understood that in the frequency band of 1 KHz or higher, the higher the frequency, the more the
−6 dB contour becomes uniform at a vertical directivity angle of about 10 °.
[0166]
02-05-2019
43
Thus, in the speaker module 110, the HF driver 140 and the LF drivers 131 and 132 are
disposed within a suitable acoustic center distance in the two-way speaker system. Therefore, the
speaker module 110 can output an acoustic signal having a uniform horizontal directivity
characteristic with less phase disturbance. In addition, the speaker module 110 can combine
high-pitched acoustic signals transmitted from the HF driver 140 arranged in two stages, upper
and lower. Moreover, the speaker module 110 can set the vertical directivity to 10 ° or less
without using an acoustic coupler.
[0167]
The speaker array 105 may be formed by connecting the speaker modules 110 in the vertical
direction. By setting the vertical directivity angle to, for example, 10 ° or less in the entire
frequency band, the acoustic signal can be transmitted to a predetermined horizontal coverage
range with little spread in the vertical direction in the entire frequency band.
[0168]
The speaker module 110 and the speaker array 105 can be used as a general-purpose and homeuse speaker system. Therefore, the sizes of the speaker module 110 and the speaker array 105
may be smaller than the sizes of the speaker module 10 and the speaker array 5 of the first
embodiment.
[0169]
The speaker module 110 and the speaker array 105 may be a one-way system. The one-way
system is, for example, one channel of an acoustic signal when viewed from an amplifier, but a
filter configured by an analog circuit on a substrate separates the frequency of the amplified
acoustic signal, and the acoustic signal of high range is separated. A low frequency range
acoustic signal may be generated.
[0170]
02-05-2019
44
In addition, the speaker module 110 may be provided with an amplifier inside and function as a
self-contained module. Also, the amplifier may be provided outside the speaker module 110.
[0171]
Further, although it has been illustrated that the frequency band handled by the two LF drivers
131 and 132 is an acoustic signal of 1 kHz and the same frequency band, different frequency
bands may be handled.
[0172]
Here, the frequency band of the acoustic signal handled by the LF drivers 131 and 132 is 1 kHz
or less, and the same frequency band is exemplified, but different frequency bands may be
handled.
For example, the LF drivers 131 and 132 may function as a lower band (for example, 500 Hz or
less) LF driver and a higher band (for example, 500 Hz to 1 kHz) LF driver. Thereby, a 3-way
speaker system can be constructed. In addition, the speaker module 110 separates the frequency
band of the acoustic signal handled by the two LF drivers 131 and 132, but the frequency band
is dispersed although the LF drivers 131 and 132 handle, the acoustic center distance of the LF
drivers 131 and 132 Even if it is a little long, the phase shift hardly occurs and phase
interference can be reduced.
[0173]
[Repeat Description and Supplement for Speaker Array] Hereinafter, the speaker module 110 and
the speaker array 105 according to the present embodiment will be described in other words and
supplements.
[0174]
The present embodiment is used for a loudspeaker system having unique features and
characteristics.
[0175]
02-05-2019
45
This system is a system of line array speaker modules and is intended to be used in a vertical
array of two or more speaker modules.
Thus, this system forms a high power loudspeaker system with a variable coverage in the vertical
direction and a fixed horizontal dispersion angle.
[0176]
In prior art systems of the line array speaker type, the requirement of planar or relatively nonscalable wave fronts is required to allow successful use in the vertical line array format.
[0177]
Various means are discussed in the prior art to achieve the required planar shape wavefront.
[0178]
The prior art describes such types of systems, with different means for obtaining planar
wavefronts from intermediate and high frequencies.
[0179]
Such means include various types of waveguides that form an acoustic waveform pattern to
ensure good frequency and phase responses at intermediate and high frequencies.
[0180]
Various systems are produced from the prior art and consist of different sized drivers, the
number of drivers, as well as different means for pattern control and generation of planar
wavefronts.
[0181]
This embodiment takes a different approach to solve the key requirements for the line array
module.
[0182]
02-05-2019
46
Embodiments use MF / HF drivers (eg, HF driver 140).
This driver is manufactured by BMS of Germany, part number 4510N.
[0183]
Since this MF / HF driver provides the required planar wavefront, only the addition of an acoustic
dispersion limiting device (e.g. waveguide 121) is required.
[0184]
This acoustic dispersion limiting device allows the planar wavefront to extend in the horizontal
direction and the horizontal pattern to be approximately 90 °.
[0185]
It should be noted that it is readily apparent to one skilled in the art that other horizontal
distribution patterns can be generated and included within the scope of this embodiment.
Other horizontal distribution patterns include asymmetric patterns, user variable horizontal
patterns, and all such derivatives.
[0186]
The line array speaker system also includes two 8-inch cone drivers on both sides of the acoustic
dispersion limiting device to generate low frequency energy.
[0187]
Two such planar devices are stacked vertically to match the planar wavefront of the 8 inch driver
and also to increase the SPL sensitivity and power handling.
The total sum of planar wavefronts is provided to a common input port in the acoustic dispersion
limiting device.
02-05-2019
47
[0188]
The sum of the best line array elements as devices (e.g. the speaker module 110) is increased in
the vertical direction.
The output of the acoustic dispersion limiting device should have a vertical dispersion equal to
approximately 10 °.
[0189]
This line array element here allows to be dispersed at 10 ° in the vertical direction.
[0190]
The space between the 8-inch drivers will be such that they sum up in a completely horizontal
area, and side lobes and other such off-axis problems will be minimized. Must.
Side lobes and other such off-axis problems are usually created by having horizontally adjacent
pairs of drivers.
[0191]
This embodiment is achieved in various ways.
1) The driver (e.g. HF driver 140) is partially located behind the acoustic dispersion limiting
device to allow adequate space for crossover points.
2) Because of the relatively large size of the 8-inch driver, ensure that the 8-inch driver appears
acoustically as the smallest driver that approaches the crossover point, transitioning from the
upper base to the middle region There is a need to.
02-05-2019
48
This is achieved by an 8-inch driver angle, and the back of the acoustic dispersion limiting device
functions as an additional acoustical limiting device (eg HF driver 140) and the 8-inch driver
looks like a 4-inch acoustic driver Achieved by the facts.
[0192]
The line array element is typically used as a two-way speaker, but it is acceptable that this
element can be operated as a three-way device by allowing the 8-inch driver to operate in
bandpass mode. It is clear to the trader.
This allows both 8-inch drivers to be used at low frequencies, but at high frequencies more
energy is coupled into a single 8-inch driver.
This results in better off-axis horizontal lobe control.
[0193]
The line array elements are designed symmetrically.
The MF / HF driver is located in the middle of this element. Low frequency drivers are placed to
the left and right.
[0194]
Symmetry supports guaranteeing on-axis or off-axis symmetry required in line array elements.
[0195]
This embodiment is further described, by way of example, below.
02-05-2019
49
1) ラインアレイスピーカエレメントである。 2) Line array speaker elements disclosed herein
and their logical derivatives. 3) A line array speaker element as disclosed herein with two planar
MF / HF drivers and two low frequency drivers. 4) A line array loudspeaker element as disclosed
herein, using two or more planar drivers (e.g. HF driver 140) arranged vertically and inputting a
common coupling port. 5) A line array loudspeaker element as disclosed herein comprising an
acoustic dispersion limiting device covering a frequency range from intermediate frequency to
high frequency. 6) A line array loudspeaker element as disclosed herein, wherein the vertically
arranged planar drivers are coupled to a common coupling port, the output of which has an
acoustic dispersion limiting device. 7) A line array loudspeaker element as disclosed herein
comprising two 8 inch low frequency drivers arranged in a horizontally symmetrical pattern. 8) A
line array loudspeaker element as disclosed herein, wherein the vertically arranged planar MF /
HF driver is at the center of an array of two 8-inch low frequency drivers. 9) including means for
combining closely spaced 8-inch low frequency drivers to improve and limit horizontal dispersion
by an appropriate angle to each of the 8-inch drivers relative to the center of the line array
speaker element, 1 is a disclosed line array speaker element. 10) 8-inch up to the crossover point
frequency in the MF / HF driver, through acoustic shading (Shadowing) device to make the 8inch driver look like a smaller driver near the crossover point Figure 12 is a line array speaker
element disclosed herein, including means for coupling low frequency drivers. 11) Acoustic
shading device (e.g. HF driver 140) is a line array loudspeaker element as described in 10)
behind the MF / HF acoustic dispersion limiting device. 12) A compact design, disclosed herein,
comprising mechanical means required to interconnect the housings to form a large vertical
alignment, having two or more such elements Line array speaker elements. 13) A line array
loudspeaker element as disclosed herein operable in an electrically activated two way system, a
band pass coupled three way system, or a passive one way system.
14) A line array loudspeaker element as disclosed herein, which may optionally include the
required electrical elements in order to be a completely self contained and self powered line
array loudspeaker element. 15) A line array loudspeaker element as disclosed herein, operating
with a distribution pattern of 90 ° horizontally and nominally 10 ° vertically.
[0196]
Although various embodiments have been described above with reference to the drawings, it
goes without saying that the present invention is not limited to such examples. It will be apparent
to those skilled in the art that various changes or modifications can be conceived within the
scope of the appended claims, and of course these also fall within the technical scope of the
present invention. It is understood.
02-05-2019
50
[0197]
In the first embodiment, the case where two MF / HF drivers 41 and 42 are connected to one
acoustic coupler 45 is shown, but four MF / HF drivers may be connected to one acoustic coupler
45. .
[0198]
In the first and second embodiments, the waveguide 21 may be omitted.
In this case, the speaker modules 10 and 110 do not limit the spread of the output acoustic
signal in the horizontal direction, and become nondirectional in the horizontal direction, and can
cover a wide range in the horizontal direction.
[0199]
In the first and second embodiments, the horizontal direction and the vertical direction may be
reversed.
[0200]
The present disclosure is useful for a speaker device and the like that can reduce the phase shift
of the acoustic signal output from each acoustic driver and output an acoustic signal of large
acoustic energy.
[0201]
5, 105 Speaker Array 10, 110 Speaker Module 10z, 110z Casing 11, 111 Waterproof Sheet 13,
113 Handle 15, 16, 115, 116 Rear Aisle 21, 121 Waveguide 23, 24, 123, 124 Resonant Plate
23y, 24y , 123y, 124y screw holes 23z ribs 31, 32, 131, 132 LF drivers 31z, 32z, 131z, 132z
output ports 40 MF / HF driver units 41, 42 MF / HF drivers 45 acoustic couplers 47, 48
acoustic paths 51, 52 Mounting part 121v Lower plate 121w Upper plate 125 Protrusion 140
HF driver AX1, AX2, AX3a, AX3b, AX12, AX13a, AX13b Virtual axis IN1, IN2 Input port OT
Output port sc, sc2 Sound center position
02-05-2019
51
Документ
Категория
Без категории
Просмотров
0
Размер файла
72 Кб
Теги
jp2018125818
1/--страниц
Пожаловаться на содержимое документа