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JP2008263293

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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
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DESCRIPTION JP2008263293
[PROBLEMS] To provide a sound emitting apparatus capable of emitting uniform sound pressure
at a sufficient volume throughout a room. SOLUTION: Loudspeakers 5L and R emit sounds of L
and R channels in the front direction of the sound emitting device 1, respectively. The speaker
array 50 emits an audio beam to the outside (the direction in which the angle from the front of
the apparatus approaches 90 degrees) than the speakers 5L and 5R. The sound beam has its bass
component cut by filtering. In the seats A, B, G, and H, among the sounds emitted from the
speakers 5L and 5R, the high-pitched voice hardly reaches but the high-pitched voice of the voice
beam reaches. Of the sounds emitted from the speakers 5L and 5R, the low-pitched sound has
poor directivity and reaches the seats A, B, G, and H. Therefore, uniform sound pressure can be
emitted at a sufficient volume throughout the room. [Selected figure] Figure 4
Sound emission device
[0001]
The present invention relates to a sound emitting apparatus for emitting sound having strong
directivity in a specific direction.
[0002]
In lounges and the like, stereo speakers are often installed in the store to play musical tones.
In addition, also in a karaoke apparatus installed in a snack shop or the like, the accompaniment
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sound and the singing voice are often amplified from the stereo speakers.
[0003]
However, the higher the sound, the sharper the directivity. Therefore, high sound is hard to hear
in a direction deviated from the front (the sound emission direction) of the speaker, resulting in a
muffled sound.
[0004]
Therefore, in general, a horn-type high-tone speaker (tweeter) is often used to widen the
directivity of high-tone sounds. Also, it is conceivable to install a plurality of tweeters so that
high-pitched sound can be emitted in a plurality of directions. By arranging a plurality of
tweeters in different directions, high sound can be emitted over a relatively wide range.
[0005]
FIG. 1A is a diagram showing the directivity of a speaker apparatus (speakers L and R) having
two tweeters. In the figure (A), the directivity of the high-pitched sound (for example, several
kHz) is shown. The speakers L and R respectively emit high-pitched sound in a direction deviated
from the front by a predetermined angle. In this example, since the sound is emitted in two
directions, the high-pitched sound can be emitted in a relatively wide range rather than the
sound emission only in the front direction of the speaker. Therefore, high-pitched sounds can be
efficiently heard in the seats C to F near the front of the device.
[0006]
Further, there is known a sound emitting apparatus that outputs an audio beam having strong
directivity in a specific direction by delay-controlling an audio signal supplied to each unit of a
speaker array (see, for example, Patent Document 1). FIG. 1B shows an example of generating a
plurality of voice beams in the apparatus of Patent Document 1. As shown in FIG. As shown in
FIG. 6B, the apparatus of Patent Document 1 can emit voice with uniform sound pressure in a
plurality of directions by outputting a voice beam. JP 2005-173137 A
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[0007]
However, even when a plurality of tweeters are provided, it is not always possible to emit sound
with uniform sound pressure throughout the room. That is, when the speaker device is installed
in a room which is wide in the lateral direction, the sound pressure of high sound decreases as
the angle from the front of the speaker device approaches 90 degrees. In FIG. 1A, in the seat B
and the seat G, which have a large deviation angle from the front of the speaker, it is difficult to
hear a high-pitched sound than the seats C to F. In particular, with regard to the seat A and the
seat H, in which the angle from the front of the speaker device is near 90 degrees, the highpitched voice hardly reaches.
[0008]
On the other hand, as shown in FIG. 6B, in order to output an audio beam, it is necessary to
install a large number of speaker units, and for this purpose, it is necessary to use small diameter
ones for each speaker unit. Therefore, it was not possible to secure a sufficient volume as a
whole, and it was particularly difficult to hear the bass.
[0009]
Therefore, an object of the present invention is to provide a sound emitting apparatus capable of
emitting uniform sound pressure with a sufficient sound volume throughout the room.
[0010]
A sound emitting apparatus according to the present invention includes a speaker array formed
by arranging a plurality of speaker units, a wide area speaker unit capable of emitting a
frequency band wider than at least a speaker unit of the speaker array, and a low frequency band
of an audio signal. Filter unit for reducing components, an input unit for inputting an audio signal
and outputting this audio signal to the wide-area speaker unit and the filter unit, and an audio
signal whose low-frequency component is reduced by the filter unit is the speaker array A sound
output processing unit for delaying an input to each of the speaker units and outputting an audio
beam having directivity in a specific direction to the speaker array, and the audio beam in a
direction out of the sound emission direction of the wide area speaker unit And a control unit
configured to set the sound output processing unit so as to face.
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[0011]
In this configuration, sound is emitted from the wide-area speaker unit (for example, a full-range
speaker unit), and an audio beam is output from the speaker array.
Further, the low frequency component of the audio signal input to the speaker array is reduced.
The sound beam output from the speaker array is directed away from the sound emission
direction of the wide area speaker unit. The higher the distance from the sound emission
direction of the wide-area speaker unit, the harder it becomes to hear the high-tone component,
but the sound beam containing only the high-tone component is directed in that direction. The
pressure can be emitted.
[0012]
Furthermore, the invention is characterized in that the wide-area speaker unit and the speaker
array are provided in separate housings.
[0013]
In this configuration, an existing stereo speaker device or the like can be used as a wide-area
speaker unit by using the high-frequency speaker unit and the speaker array as separate cases.
[0014]
Further, the present invention further includes a plurality of the wide area speaker units, the
input unit receives audio signals of a plurality of channels, and outputs an audio signal of each
channel to the plurality of wide area speaker units and the filter unit. The sound output
processing unit mixes audio signals of a plurality of channels with low-frequency components
reduced by the filter unit at a predetermined mixing ratio to generate one or a plurality of audio
signals, and then each speaker of the speaker array It is characterized by delay input to the unit.
[0015]
In this configuration, audio signals of a plurality of channels are input to a plurality of wide area
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speaker units, respectively.
Also, audio signals of multiple channels are mixed to output an audio beam.
Various modes are conceivable for the mixing ratio. For example, when two wide-area speaker
units are installed and audio signals of two channels are respectively input, these audio signals
are mixed one-on-one to The voice beam is output in the direction out of the sound emission
direction.
By appropriately setting the number of channels and the mixing ratio, it is possible to further
emit uniform sound pressure throughout the room.
[0016]
Further, the present invention further comprises a microphone for picking up voice and a
microphone position detection means for detecting the position of the microphone, and the
control means detects the frequency characteristic of the voice signal picked up by the
microphone, The frequency characteristic and the position of the microphone are associated with
each other, and the sound emission processing unit is set so that the sound beam is directed to
the direction of the position of the microphone at which the high sound component of the
frequency characteristic is lowered.
[0017]
In this configuration, a microphone is used to determine an area where high-range voices are
difficult to reach, and a voice beam is set to be directed to this area.
[0018]
According to the present invention, the sound beam including only the high-tone component is
directed in the direction away from the sound emission direction of the wide-area speaker unit,
so that uniform sound pressure can be emitted with a sufficient volume throughout the room. it
can.
[0019]
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The sound emitting apparatus of this embodiment emits the sound input from another apparatus
while controlling the directivity in a predetermined direction and emitting only the high sound
area while emitting the sound through the stereo speaker.
This sound emitting device can be used as a speaker device that emits various audio sources by
connecting to a television or an audio device, and a loudspeaker that outputs collected sound by
connecting a microphone. It is also possible to use as an apparatus or a karaoke apparatus.
Hereinafter, a sound emitting apparatus which is an embodiment of the present invention will be
described with reference to the drawings.
FIG. 2 is a block diagram showing the configuration of the sound output device. FIG. 3 is a view
showing the appearance (sound emission surface) of the sound emission device. The sound
emitting device 1 includes an input interface (I / F) 2, an amplifier (AMP) 3L, an amplifier (AMP)
3R, a speaker 5L, a speaker 5R, a speaker array 50, an A / D converter 41, an A / D converter 42,
A filter 45, a filter 46, a mixer 6, a beam control unit 7, D / A converters 81 to 88, amplifiers
(AMPs) 91 to 98, and a control unit 11 are provided.
[0020]
The input I / F 2 inputs stereo audio signals (audio signals of two channels) from another device.
The input I / F 2 outputs the audio signal of the L channel among the input stereo audio signals
to the A / D converter 41 and the amplifier 3L. Further, the audio signal of the R channel is
output to the A / D converter 42 and the amplifier 3R. Although an analog audio signal is input in
this embodiment, a digital audio signal may be input. In that case, the D / A converter may be
provided in the front stage of the amplifiers 3L and 3R. Also, the input I / F 2 may input the
digital audio signal directly to the filter 45 and the filter 46 (input without passing through the A
/ D converter 41 and the A / D converter 42).
[0021]
The amplifier 3L amplifies the L channel audio signal and outputs it to the speaker 5L. Also, the
amplifier 3R amplifies the audio signal of the R channel and outputs it to the speaker 5R. The
speakers 5L and 5R installed at the end of the case of the sound emitting apparatus are wide-
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range (full-range) speaker units that emit sound from a low frequency (for example, about 20 Hz)
to a high sound (for example, about 20 kHz). As a result, the sound of the L channel is emitted
from the speaker 5L, and the sound of the R channel is emitted from the speaker 5R.
[0022]
The audio signal of the L channel input to the A / D converter 41 is converted into a digital signal
and input to the filter 45. Further, the audio signal of the R channel input to the A / D converter
42 is converted into a digital signal and input to the filter 46. The filter 45 and the filter 46 are
so-called high pass filters, and cut bands below the predetermined frequency of the audio signal.
Since the speaker array 50 to which these audio signals are input is a small aperture speaker
unit, an audio signal whose low frequency has been cut for unit protection is input. Further, as
described later, since the sound emitted from the speaker array 50 is for covering an area where
high sound does not easily reach among the sounds emitted from the speakers 5L and 5R, the
bass component of these sounds Are cut in advance in the filters 45 and 46 so as not to interfere.
The cutoff frequency may be set as appropriate, for example, about 400 Hz.
[0023]
The audio signals of L channel and R channel whose low frequencies are cut by the filters 45 and
46 are input to the mixer 6, respectively. The mixer 6 mixes these audio signals to generate a
plurality of (two in the figure) audio signals. The control unit 11 sets the mixing ratio of the two
audio signals to be generated. For example, audio signals of L channel and R channel are set to
be mixed at a ratio of 1: 1 (each to be monaural audio). The two generated audio signals are
output to the beam control unit 7.
[0024]
The beam control unit 7 refers to the two input audio signals (hereinafter, signals for beam 1 and
signals for beam 2 respectively). Are branched, subjected to delay processing and gain control,
and then output to D / A converters 81 to 88. These audio signals are analog converted by the D
/ A converters 81 to 88, amplified by the amplifiers 91 to 98, and then input to the speaker array
50.
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[0025]
The speaker array 50 has a plurality of (eight in the example shown in FIG. 3) speaker units 51 to
58 linearly arranged in parallel in two lines at positions sandwiched by the speakers 5L and 5R,
and they are respectively input. It emits an audio signal. Note that the number of speaker units
and the manner of arrangement are not limited to this example. In the example shown in FIG. 3,
the speaker units 51 to 58 are linearly arranged in parallel in two rows, and the speakers 5L and
5R are arranged on the outside thereof, as shown in FIG. 5A, for example. The speaker units 51
to 58 may be arranged in one row, or may be a speaker array in which a plurality of speaker
units are further arranged as shown in FIG. Further, as shown in FIG. 6C, speaker units having
different diameters may be arranged, or as shown in FIG. 6D, the arrangement intervals may be
different.
[0026]
In addition, the speaker array 50 and the speakers 5L and 5R may be provided as separate
housings. FIG. 6 is a block diagram and an external view showing a configuration of a sound
emitting device in the case where the speaker array 50 and the speakers 5L, 5R are provided in
separate housings. In addition, in the block diagram of the figure (A), the same code | symbol is
attached | subjected about the structure which is common in FIG. 2, and the description is
abbreviate | omitted.
[0027]
As shown in FIG. 6B, the speaker array 50 of the sound emitting device 100 is a separate housing
from the speakers 5L and 5R. A sound emitting device 100 shown in FIG. 6A has a configuration
in which the speakers 5L and 5R and the amplifiers 3L and 3R are omitted from the sound
emitting device 1 shown in FIG. The input I / F 2 outputs the input stereo audio signal to the A /
D converters 41 and 42, respectively. The amplifiers 3L and 3R respectively input stereo audio
signals and output the signals to the speakers 5L and 5R. That is, the speakers 5L and R, and the
amplifiers 3L and 3R are existing stereo sound emitting devices. As described above, even when
the sound output device 100 is connected to the existing stereo sound output device, the sound
output device of the present invention is completed. The introduction cost can be reduced by
using the existing stereo sound emitting apparatus.
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[0028]
Further, as shown in FIG. 6C, the speaker array 50 may be further divided into a plurality of
housings and installed. By dividing the speaker array into a plurality of housings, the number of
speaker units of the speaker array can be easily changed according to the size of the room, and
versatility is enhanced.
[0029]
The beam control unit 7 can form an audio beam having strong directivity in a predetermined
direction by performing delay processing and gain control on audio signals input to the speaker
units 51 to 58 of the speaker array 50. The delay amount and gain of the audio signal
corresponding to each of the speaker units 51 to 58 are set by the control unit 11. The sound
emitted by each of the speaker units 51 to 58 is intensified in the region where the phase is
common, and conversely is weakened in the region where the phase is different. Therefore, the
audio beam can be directed in a specific direction by controlling the delay amount of the audio
signal input to each speaker unit.
[0030]
FIG. 4 shows an example of beam control. The example of the figure shows the directivity of
high-pitched voice (for example, several kHz). The speakers 5L and 5R respectively emit highpitched sound in the front direction of the sound emitting device 1. Therefore, in the seats C to F
near the front of the device, sound is emitted with uniform sound pressure from low to high.
[0031]
Here, the beam control unit 7 performs delay processing so that the voice beam is directed to the
outside (the direction in which the angle from the front of the apparatus approaches 90 degrees)
than the speakers 5L and 5R. That is, the beam 1 is directed to the left seats A, B towards the
sound emitting device 1. Also, the beam 2 is directed to the right seats G, H towards the sound
emitting device 1.
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[0032]
In the seats A and B, among the sounds emitted from the speaker 5L, the high-pitched sound is a
region that is difficult to reach, but the sound of the beam 1 reaches. On the other hand, among
the sounds emitted from the speaker 5L, the low-pitched sound is dull in directivity and reaches
the area of the seats A and B. The sound of the beam 1 does not interfere with the low frequency
component of the speaker 5 L because the low frequency component is cut by the filter 45.
[0033]
Similarly, in the seats G and H, among the sounds emitted from the speaker 5R, the high-pitched
sound is an area that is difficult to reach, but the sound of the beam 2 reaches. On the other
hand, among the sounds emitted from the speaker 5R, the low-pitched sound is dull in directivity
and reaches the area of the seats G and H. The sound of the beam 1 does not interfere with the
low frequency component of the speaker 5R because the low frequency component is cut by the
filter 46.
[0034]
The voices of beam 1 and beam 2 contain only high-pitched sound since they are voices whose
low frequencies are cut and beamed by a plurality of small-aperture speaker units. Since the
voices of beam 1 and beam 2 containing only high tones cover areas where high tones are
difficult to reach among the voices emitted by the speakers 5L and 5R, all the seats A to H have
sufficient volume and uniformity. Sound pressure can be secured.
[0035]
In the above example, in the mixer 6, the signal for beam 1 and the signal for beam 2 are set so
that the audio signals of L channel and R channel are included in a one-to-one relationship,
respectively. is not.
[0036]
In the seats C and D, since the sound of the speaker 5L can be efficiently delivered, mainly the
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sound of the L channel can be heard well.
In the seats A and B, since the low-range voice of the voice of the speaker 5L can be efficiently
delivered, mainly the low-pass component of the L channel can be heard well. Therefore, if the
mixing ratio is set so that many L channel audio signals are included in the beam 1 in the mixer
6, the L channel audio can be heard well in all bands in the seats A and B. Similarly, when the
mixing ratio is set so that many R channel audio signals are included in the beam 2 in the mixer
6, the R channel audio can be heard well in all bands in the seats G and H.
[0037]
On the other hand, if the mixing ratio of the beam 1 signal and the beam 2 signal is set so that
the L channel and R channel audio signals become one to one respectively, only the high
frequency components of the R channel in the seats A and B, It will be heard at a relatively loud
volume. In addition, in the seats G and H, only the high frequency component of the L channel
can be heard at a relatively large volume. In this case, the audio signals of the speakers 5L and
5R are mixed so that the audio signals of the L channel and the R channel are included in a oneto-one relationship, and then set so as to be emitted (that is, as monaural audio). Mono sound will
be heard uniformly on all seats.
[0038]
In any case, the mixing ratio of the mixer 6 and the mixing ratio of the audio signal output to the
speakers 5L and 5R may be appropriately set according to the use conditions. In this case, a
plurality of presets may be prepared in the built-in memory (not shown) of the control unit 11,
and the user may set the mixing ratio by designating one of them. Also, the direction of the beam
may be specified from a plurality of presets.
[0039]
When the sound emitting device 1 is installed, the mixing ratio and the direction of the sound
beam may be automatically set using a microphone. That is, in FIG. 2, an audio signal collected by
the microphone is input to the control unit 11, and the control unit 11 detects the position of the
microphone and analyzes the frequency characteristic of the audio signal collected at that time.
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[0040]
The microphone position may be detected by any method, for example, as follows. FIG. 7 is a
conceptual view showing microphone position measurement. The control unit 11 sequentially
transmits the same test audio signal (for example, white noise) to the speaker unit 51 at one end
of the speaker array 50 and the speaker unit 58 at the other end via the beam control unit 7.
input. When the control unit 11 picks up the inspection voice signal from the microphone 101,
the control unit 11 detects this pick-up timing.
[0041]
The control unit 11 counts a time t1 from the timing at which the speaker unit 51 outputs the
measurement voice to the sound collection timing. Further, a time t2 from the timing when the
speaker unit 58 outputs the measurement voice to the time when the sound collection timing is
counted. The control unit 11 calculates the microphone position using the time t1 and the time
t2. That is, the control unit 11 can measure the distance between the speaker unit 51 and the
microphone 101 and the distance between the speaker unit 58 and the microphone 101 from
the relationship between the times t1 and t2 and the speed of sound. The position information of
the microphone 101 can be measured by triangulation if the distance information of The position
of the microphone 101 is, as shown in FIG. 7, a distance r from the center position (viewed from
the top) of the sound emitting device 1 and a front direction from the center position (speaker
sound emitting surface, ie orthogonal to the array long axis direction Is represented by a shift
angle .phi. With respect to the axis (the angle is 0 degree) of the
[0042]
Here, the control unit 11 Fourier-transforms the measurement voice input from the microphone
101 to calculate frequency characteristics. The frequency characteristic and the microphone
position are correlated and stored in the built-in memory. Here, when the user of the sound
emitting device 1 moves the microphone 101 in the room, it is possible to obtain the frequency
characteristics of each position in the room. The control unit 11 determines an area where high
sound is hard to reach from the frequency characteristic and the microphone position stored in
the built-in memory, and sets the beam control unit 7 to direct the audio beam to the area where
the high sound is hard to reach. Do. Thereby, the uniform sound pressure can be emitted
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accurately in the entire room.
[0043]
Although FIG. 4 shows an example in which the number of voice beams is two, the number of
beams may be one, and a plurality of voice beams may be formed. Also, the source of the input
audio signal is not limited to stereo. It may be a monaural audio signal or may be an audio signal
of a plurality of channels. It is sufficient to provide speaker units for full range as many as the
number of input channels.
[0044]
It is a figure which shows the high sound directivity of the conventional sound emission
apparatus. It is a block diagram which shows the structure of a sound emission apparatus. It is a
figure which shows the external appearance of a sound emission apparatus. It is a figure which
shows an example of beam control. It is a figure which shows the number of speaker units, and
the other example of arrangement | positioning. It is a block diagram and an external view which
show the structure of the sound emission apparatus at the time of using the speaker array 50
and the speakers 5L and 5R as another housing | casing. It is a conceptual diagram which shows
a microphone position measurement.
Explanation of sign
[0045]
1-Sound emission device 2-Input I / F 3L, 3R-amplifier 41, 42-A / D converter 5L, 5R-Speaker 50Speaker array 6-Mixer 7-Beam control part 81-88-D / A converter 91 98 98-amplifier 11-control
unit
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