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JPH0998499

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH0998499
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
front surround speaker device. Specifically, by attaching the surround speakers of the left and
right channel speaker devices to the speaker box so that the main axes thereof are directed
inward, the listening range in which a good surround effect can be obtained is expanded. The
present invention relates to a front surround speaker device.
[0002]
2. Description of the Related Art FIG. 7 shows a state in which a conventional front surround
speaker device is disposed in a trial listening room 100. FIG. This speaker device is composed of
a left channel speaker device 1L and a right channel speaker device 1R. For example, the speaker
device 1L includes an audio signal reproduction speaker that reproduces a left audio signal, and
a surround signal reproduction speaker that reproduces a surround signal. The speaker device
1R includes an audio signal reproduction speaker that reproduces a right audio signal. It has a
speaker for surround signal reproduction which reproduces a surround signal.
[0003]
In this case, the surround signal reproduction speaker is attached to the speaker box in such a
manner that the main axis of the speaker faces the front direction of the speaker box or a
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predetermined angle with respect to the front direction. FIG. 8 shows that the speakers for
surround signal reproduction 3L, 3R are the same as the main axes of the audio signal
reproduction speakers 2L, 2R of the speaker devices 1L, 1R are directed in the front directions
FL, FR of the speaker boxes 4L, 4R. An example is shown in which the main axes MAL and MAR
also face in the front directions FL and FR. Further, in FIG. 9, while the main axes of the audio
signal reproduction speakers 2L and 2R of the speaker devices 1L and 1R are directed to the
front directions FL and FR of the speaker boxes 4L and 4R, respectively, the surround signal
reproduction speakers 3L, An example is shown in which the main axes MAL and MAR of 3R face
outward by a predetermined angle θ with respect to the front directions FL and FR.
[0004]
SUMMARY OF THE INVENTION In the above-described conventional front surround speaker
device, the original surround effect is obtained when listening at the listening position on the
center line M of the speaker devices 1L and 1R shown in FIG. 7, for example, at point a. However,
in the case of listening at a listening position deviated from the center line M, for example, at
point b, there is a drawback that the surround effect is significantly reduced. Hereinafter, the
reason why the surround effect is significantly reduced at the listening position off the center
line M will be described while explaining the principle of the two-channel front surround stereo
reproduction system.
[0005]
This front surround reproduction system is a system for obtaining a surround effect using two
front speaker devices (speaker devices for left and right channels), and generates a sound image
not only in the front direction but also in the side direction or the rear direction, It is a system
that creates a wide-angle sound stage sensibly, for example, giving a sense of hearing like
listening to music in a wide theater. Therefore, the front surround system is a pseudo threedimensional sound reproduction system using aural sense, and is distinguished from an orthodox
multi-channel three-dimensional sound reproduction system which tries to create a threedimensional real sound field in a listening space.
[0006]
First, the two-channel stereo signal is composed of an M signal component which is a mono
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signal and an S signal component which gives a direction of sound image localization. That is, the
left channel L signal (left audio signal) is the sum of M and S components, ie L = M + S, and the
right channel R signal (right audio signal) is the difference between M and S components, ie R = It
is M-S. Therefore, the S signal component is nothing but a signal of the difference between the L
signal and the R signal, and is a signal that differs in magnitude and polarity depending on the
direction of sound image localization.
[0007]
That is, at point a on the center line M of the speaker devices 1L and 1R in FIG. 7, when the
sound image is localized forward in the center, the S signal component is zero and only the M
signal component, and the sound image is from the center forward When the sound signal is
localized on the left side, the polarity of the S signal component is the same as that of the M
signal component, and when the sound image is localized to the right from the center front, the
polarity of the S signal component is negative. Therefore, it can be expressed as S = ± S0, and
when the sound image is localized to the left from the center front, L = M + (+ S0) = M + S0, R =
M − (+ S0) = M−S0, that is, L> R L = M + (-S0) = M-S0, R = M-(-S0) = M + S0, that is, L <R when
the sound image is localized to the right from the center front.
[0008]
Next, in the front surround stereo reproduction system, in addition to the original L and R signals
of 2-channel stereo, the surround signal mainly composed of the S signal component is matched
to the polarity of the S signal component of the L and R signals. A method is adopted in which the
signal is electrically superimposed and reproduced or reproduced using a dedicated speaker.
Basically, the surround signal mainly consists of S signal components, but in order to produce a
more realistic surround effect, signal processing such as time delay, reverberation addition or
emphasis on specific frequency components is performed on the S signal components. It will be.
That is, the front surround stereo reproduction system is basically a system which performs
appropriate signal processing on the S signal component contained in the original L and R
signals, and emphasizes and reproduces the signal. By adopting such a reproduction method, the
intended surround effect can be obtained at the listening position on the center line M of the
speaker devices 1L and 1R in FIG. 7, for example, at the point a.
[0009]
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Here, the physical acoustic conditions of the reproduction sound at the listening position on the
center line M of the speaker devices 1L and 1R, for example, the point a, are the respective signal
sound components of M, S and surround radiated from the speaker devices 1L and 1R. The
condition is that all have the same size and arrive at the same time. This condition is a condition
for sensibly reproducing a continuous sound stage between the speaker devices 1L and 1R by
both the M and S signal sound components, and providing an intended surround effect by the
surround signal sound components, is important. However, at the listening position deviated
from the center line M of the speaker devices 1L and 1R in FIG. 7, for example, point b, the
reproduced sound of the speaker devices 1L and 1R has a level difference and a time difference,
and the above condition is not satisfied.
[0010]
Furthermore, when the surround signal is reproduced by the dedicated speakers 3L, 3R (see
FIGS. 8 and 9), the main axes MAL, MAR of the speakers 3L, 3R are listening positions on the
center line M of the speaker devices 1L, 1R, for example Seeing from a point, it is facing
frontward or outward. As such surround signal reproduction speakers 3L and 3R, generally,
small-sized speakers with an aperture of about 8 cm are used. In the case of a small speaker
having a diameter of about 8 cm, as shown in FIG. 10, directivity dependent on the diameter
starts to be added from a frequency of about 1 kHz, and the directivity is sharper as the
frequency is higher.
[0011]
Therefore, the listening position of the speaker devices 1L and 1R shown in FIG. 7, for example,
the surround signal sound at the point b deviates from the directionality of the speaker devices
1L and 1R and the distance from the direction of the speaker devices 1L and 1R. Due to the
difference in attenuation, the right channel side is larger and the left channel side is smaller. In
particular, when the main axes of the surround signal reproduction speakers 3L and 3R are
directed outward (see FIG. 9), the level difference due to the directivity of the surround signal
sound of the left and right channels becomes more remarkable. Therefore, as described above,
the surround effect at the listening position deviated from the center line M of the speaker
devices 1L and 1R in FIG. 7, for example, the point b is significantly reduced.
[0012]
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Therefore, the present invention provides a front surround speaker device capable of expanding
a listening range in which a good surround effect can be obtained.
[0013]
In the front surround speaker device according to the present invention, the speakers for
reproducing the surround signals of the left and right channel speaker devices have main axes
respectively directed to the front direction of the speaker box. It is attached to the speaker box so
as to be inclined counterclockwise and clockwise by a predetermined angle.
[0014]
The main axes of the speakers for reproducing the surround signals of the left and right channel
speaker devices are directed inward from the listening position on the center line of both speaker
devices.
Therefore, at the listening position deviated from the center line of both speaker devices, the
level difference based on the difference in the distance attenuation of the surround signal sound
of both the left and right channels is corrected by the directivity of the medium and high
frequency of the speaker reproducing the surround signal. The listening range where a good
surround effect can be obtained is expanded.
[0015]
DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a first embodiment of the present
invention will be described.
FIG. 1 shows a front surround speaker device 10 according to a first embodiment, and the
speaker device 10 includes a left channel speaker device 11L and a right channel speaker device
11R.
[0016]
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The speaker device 11L is a two-way speaker device in which a woofer 13L and a tweeter 14L
constituting a speaker for reproducing an audio signal are attached to the front surface of a
substantially rectangular speaker box 12L. The woofer 13L and the tweeter 14L are attached to
the front side of the speaker box 12L such that the main axes thereof face the front direction of
the speaker box 12L. In the speaker box 12L, the upper part of the corner formed by the front
surface and the right side surface is cut off to form a speaker mounting surface 15L, and the
speaker 16L for surround signal reproduction is attached to the mounting surface 15L. In this
case, as shown in FIG. 2, the speaker box 12L is such that the main axis MAL of the speaker 16L
is inclined counterclockwise by a predetermined angle α, for example, 40 ° to 50 ° with
respect to the front direction FL of the speaker box 12L. Attached to
[0017]
The speaker device 11R is a two-way speaker device in which a woofer 13R and a tweeter 14R
constituting a speaker for reproducing an audio signal are attached to the front surface of a
substantially rectangular speaker box 12R. The woofer 13R and the tweeter 14R are attached to
the front side of the speaker box 12R such that the main axes thereof face the front direction of
the speaker box 12R. Further, an upper portion of an angle formed by the front surface and the
left side surface of the speaker box 12R is cut away to form a speaker attachment surface 15R,
and the surround signal reproduction speaker 16R is attached to the attachment surface 15R. In
this case, as shown in FIG. 2, in the speaker box 12R, the main axis MAR of the speaker 16R is
inclined at a predetermined angle α, for example, 40 ° to 50 ° in the clockwise direction with
respect to the front direction FR of the speaker box 12R. It is attached.
[0018]
In the front surround speaker device 10 shown in FIG. 1, the main axes MAL and MAR of the
speakers 16L and 16R are inclined counterclockwise and clockwise by a predetermined angle α
with respect to the front directions FL and FR of the speaker boxes 12L and 12R, respectively.
ing. Therefore, the main axes MAL and MAR of the speakers 16L and 16R face inward as viewed
from the listening position (see FIG. 2) on the center line M of the speaker devices 11L and 11R.
[0019]
In general, the S signal component, which is the main component of the surround signal, is a
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signal having a main component at the middle and high frequencies. Moreover, since the
diaphragms of the speakers 16L and 16R have a finite area, as shown in FIG. 10, the radiated
sound waves themselves have directivity at middle and high frequencies.
[0020]
Therefore, by setting the main axes MAL and MAR of the speakers 16L and 16R to face inward
as described above, the surround of the right channel at the listening position deviated from
above the center line M, for example, point b (see FIG. 7). As the level of the signal sound
decreases, the level of the surround sound of the left channel slightly increases, and the level
difference based on the difference in the distance attenuation of the surround sound of the left
and right channels is corrected. Therefore, according to the front surround speaker device 10
shown in FIG. 1, the listening range in which a good surround effect can be obtained can be
expanded.
[0021]
The applicant conducted a hearing test to confirm that the listening range in which a good
surround effect can be obtained as described above in the front surround speaker device 10 as
shown in FIG. 1 is expanded. FIG. 3 shows a speaker device 20 used as a left channel speaker
device and a right channel speaker device in this aural test. The speaker device 20 has a speaker
device 25 disposed above the speaker device 21. The speaker device 21 is a two-way system in
which a woofer 23 with a diameter of 14 cm and a tweeter 24 with a diameter of 8 cm are
attached to a speaker box 22 having a width of 20 cm, a depth of 22 cm, and a height of 30 cm.
The reproduction band is 50 Hz to 20 kHz. The speaker device 25 is a closed speaker box 26
with a width of 9 cm, a depth of 7 cm, and a height of 9 cm, and a speaker 27 for surround signal
reproduction with an aperture of 8 cm attached. The reproduction band is 300 Hz to 20 kHz. It
is.
[0022]
The speaker device 20 shown in FIG. 3 was used as a speaker device for the left channel and a
speaker device for the right channel, and was placed in the listening room 100 having a
reverberation time of about 0.2 seconds in the state shown in FIG. . Then, in the hearing test, the
main axis (reference axis) of the woofer 23 and the tweeter 24 of the speaker device 21
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constituting the speaker device 20 for the left channel and the right channel is directed in the
front direction (parallel to the side wall of the listening room 100). In the state, when the main
axis of the speaker 27 of the speaker device 25 is directed outward by 30 °, when the main axis
of the speaker 27 of the speaker device 25 is directed frontward, the main axis of the speaker 27
of the speaker device 25 is only 45 ° The listening range in which a good surround effect can be
obtained was determined for the case of being directed inward.
[0023]
In FIG. 4, the broken line L-1 indicates the boundary of the listening range where a good
surround effect can be obtained when the main axis of the surround signal reproduction speaker
27 is directed outward by 30 °. From the broken line L-1 A good surround effect was obtained
in the range on the center line M side. The alternate long and short dash line L-2 indicates the
boundary of the listening range where a good surround effect can be obtained when the main
axis of the speaker 27 is directed in the front direction. In the range on the central line M side
from the alternate long and short dash line L-2. Good surround effect was obtained. In this case,
the listening range where a good surround effect can be obtained is slightly expanded as
compared with the case where the main axis of the speaker 27 is directed outward by 30 °.
[0024]
On the other hand, the solid line L-3 indicates the boundary of the listening range where a good
surround effect can be obtained when the main axis of the speaker 27 is directed by 45 °
inward. Good surround effects were obtained in the side range. In this case, the listening range in
which a good surround effect is obtained is further expanded as compared with the case where
the main axis of the speaker 27 is directed in the front direction. Thus, it has been confirmed that
the front surround speaker device 10 as shown in FIG. 1 can expand the listening range in which
a good surround effect can be obtained.
[0025]
Next, a second embodiment of the present invention will be described. FIG. 5 shows a front
surround speaker device 30 according to a second embodiment, and this speaker device 30 is
composed of a left channel speaker device 31L and a right channel speaker device 31R.
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[0026]
A speaker attachment surface 33L is formed between the front surface and the right side surface
of the speaker box 32L that constitutes the speaker device 31L. The speaker device 31L is a twoway type in which the woofer 34L and the tweeter 35L are attached to the speaker attachment
surface 33L. The woofer 34L and the tweeter 35L function not only as an audio signal
reproduction speaker but also as a surround signal reproduction speaker. In this case, as shown
in FIG. 6, the main axis MAL of the woofer 34L and tweeter 35L is inclined at a predetermined
angle β, for example, 40 ° to 50 ° in the counterclockwise direction with respect to the front
direction FL of the speaker box 32L. It is attached to the speaker box 32L.
[0027]
Further, a speaker mounting surface 33R is formed between the front surface and the left side
surface of the speaker box 32R that constitutes the speaker device 31R. The speaker device 31R
is a two-way type in which the woofer 34R and the tweeter 35R are attached to the speaker
attachment surface 33R. The woofer 34R and the tweeter 35R function not only as an audio
signal reproduction speaker but also as a surround signal reproduction speaker. In this case, as
shown in FIG. 6, the woofer 34R and the tweeter 35R are loudspeakers such that the main axis
MAR is inclined at a predetermined angle β, for example 40 ° to 50 °, clockwise with respect
to the front direction FR of the loudspeaker box 32R. It is attached to the box 32R.
[0028]
In the front surround speaker device 30 shown in FIG. 5, the main axes MAL and MAR of the
speakers (34L and 35L) and (34R and 35R) for reproducing the surround signal are respectively
with respect to the front directions FL and FR of the speaker boxes 32L and 32R. It is inclined
counterclockwise and clockwise by a predetermined angle β. Therefore, the main axes MAL and
MAR of the speakers (34L, 35L), (34R, 35R) face inward as viewed from the listening position
(see FIG. 6) on the center line M of the speaker devices 31L, 31R. Therefore, as in the front
surround speaker device 10 shown in FIG. 1, at the listening position deviated from the center
line M of the speaker devices 31L and 31R, the left and right channels from the speakers (34L,
35L) and (34R, 35R) The level difference based on the difference in distance attenuation of the
surround signal sound is corrected, and the listening range where a good surround effect can be
obtained can be expanded.
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[0029]
In the above-mentioned embodiment, although the example of the speaker apparatus of 2 way
system is shown, of course, it is not limited to this system. The point is that the speakers for
reproducing the surround signals of the left and right channel speaker devices have their main
axes inclined by a predetermined angle counterclockwise and clockwise with respect to the front
direction of the speaker box. It is to be attached.
[0030]
According to the present invention, the main axes of the speakers for reproducing surround
signals of the left and right channel speaker devices are directed inward as viewed from the
listening position on the center line of both speaker devices. At a listening position out of the
center line of the speaker device, the directivity of the medium and high frequency of the speaker
reproducing the surround signal corrects the level difference based on the difference in the
distance attenuation of the surround signal sound of both left and right channels. It is possible to
expand the listening range where a good surround effect can be obtained.
[0031]
Brief description of the drawings
[0032]
1 is a perspective view showing a front surround speaker device according to the first
embodiment.
[0033]
2 is a diagram showing the orientation of the main axis of the speaker reproducing the surround
signal.
[0034]
3 is a perspective view showing a speaker device used in the hearing test.
[0035]
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4 is a diagram showing the results of the hearing test.
[0036]
5 is a perspective view showing a front surround speaker device according to a second
embodiment.
[0037]
6 is a diagram showing the orientation of the main axis of the speaker to reproduce the surround
signal.
[0038]
7 is a diagram showing a conventional front surround speaker device.
[0039]
8 is a diagram showing an example in which the main axis of the surround signal reproduction
speaker faces in the front direction.
[0040]
9 is a diagram showing an example in which the main axis of the surround signal reproduction
speaker faces outward.
[0041]
10 is a diagram showing an example of the output sound pressure directional frequency
characteristics of the speaker.
[0042]
Explanation of sign
[0043]
10, 30 Front surround speaker device 11L, 31L Left channel speaker device 11R, 31R Right
channel speaker device 12L, 12R, 32L, 32R Speaker box 13L, 13R, 34L, 34R Woofers 14L, 14R,
35L, 35R tweeter 15L, 15R, 33L, 33R Speaker mounting surface 16L, 16R Speaker for surround
signal reproduction
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