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JPH04290400

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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 JPH04290400
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device for enhancing a surround effect.
[0002]
2. Description of the Related Art In general, stereo recordings recorded in a sound field contain
not a little information on sound field feeling. This exists as components with relatively low
correlation between L and R channels, and can be extracted by a simple matrix circuit such as LR and R-L. Also, by shifting the phase between both channels or analyzing it psychoacoustically,
it is possible to reverse or shift the phase only in a band where effects can be recognized, which
is different from the main channel. The signal is supplied to the sub-speaker to obtain a surround
effect.
[0003]
In the presence stereo system, in addition to the main speakers, a sub-speaker installed at an
angle so that direct sound does not reach the listener is provided almost diagonally forward. It is
intended to supply a signal with a time delay of ms to several tens of ms and to reflect and
diffuse the sound radiated from this sub-speaker to the wall of the room. Thus, by adding the
primary reflection sound from the wall in the actual concert hall, a sense of reality and a sense of
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sound are obtained.
[0004]
Furthermore, in a DSP (digital sound processor) system, complex reflections and reverberations
in actual concert halls, churches, theaters, etc. are recorded by the proximity four-point sound
collection method etc., and these patterns are used. Are stored in the ROM by digital signal
processing, and this sound field feeling component is to be reproduced from the sub-speaker in
the listening room.
[0005]
FIG. 8 shows an example of the arrangement of the surround speakers. In the corner inside the
room surrounded by the wall 1, the main speaker 2 for the L channel and the main speaker 3 for
the R channel are arranged. ing.
The L-channel sub-speaker 4 and the R-channel sub-speaker 5 are suspended or directly fixed to
the ceiling or wall of the corner of the room facing the main speakers 2 and 3 . Then, when the
reproduction sound is output from the main speakers 1 and 2, in addition to the reproduction
sound, a sub reproduction sound which is information on a sound field is output from the sub
speakers 4 and 5.
[0006]
However, in the above-described conventional speaker device, when the listening position is
located closer to the sub-speakers 4 and 5, the presence of the sub-speakers 4 and 5 becomes
floating. This is because it is easily understood that the sound source is at the spherical center
point of the spherical wave (ie, due to the directivity of the speaker).
[0007]
Therefore, when the sub speakers 4 and 5 have a sense of presence in this way, the faithful
reproduction of the information on the sound field will be incomplete and the surround effect
will be reduced. There's a problem. Also, in general, the wavefront of the sound emitted from the
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speaker is close to a spherical surface, so if the viewing position is slightly shifted, the position of
the sound image changes critically. For this reason, as understood from FIG. 8, the sound image
formed by the synthesis of the sound waves from the sub-speakers 4 and 5 changes due to a
slight shift of the viewing position, giving an unnatural feeling in surround reproduction. There is
also the problem of.
[0008]
Furthermore, as described above, the wavefront of the sound emitted from each of the subspeakers 4 and 5 is made close to a spherical surface, so that the center of the wavefront
becomes a sound source, and these sub-speakers 4 and 5 are delayed. However, there is also a
problem that it is impossible to expect an effect that gives the sound source depth. Furthermore,
as described above, the sub-speakers 4 and 5 are suspended on a ceiling or fixed to a wall, which
causes a problem of being visually disturbed.
[0009]
The present invention has been made in consideration of such circumstances, and it is an object
of the present invention to provide a speaker device capable of achieving visual improvement
and appropriate sound field feeling and presence feeling. I assume.
[0010]
SUMMARY OF THE INVENTION In the invention according to claim 1, a speaker apparatus
having a plurality of speaker units for reproducing sound field information in which vertical and
horizontal directions are arranged at substantially equal intervals from each other. In the speaker
apparatus, the main body of the speaker device is embedded or surrounded in the wall or
partition such that the acoustic emission surfaces of the plurality of sub speaker units are flush
with the wall or partition surface.
[0011]
According to a second aspect of the present invention, delay means is provided for applying the
same or different delay to each of the plurality of speaker units for each of the vertical rows.
The invention according to claim 3 is characterized in that the plurality of speaker units have a
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small aperture full range or coaxial type and have substantially the same characteristics.
[0012]
In the first aspect of the present invention, the main body of the speaker device is embedded or
surrounded in the wall or partition.
At the time of this embedding or enclosure, the acoustic emission surfaces of the plurality of
speaker units were made substantially flush with the wall surface or partition surface. Therefore,
the wall or partition can be regarded as a substantially infinite baffle, and thereby the diffraction
phenomenon of the sound wave is prevented, so that a wave front that can be regarded as a
substantially plane wave can be obtained. In addition, the main body of the speaker device is not
visually disturbed by being embedded or surrounded in the wall or partition.
[0013]
According to the second aspect of the invention, the same or different delays are applied to each
of the plurality of speaker units for which wave fronts that can be regarded as substantially plane
waves can be obtained by the delay means. Therefore, since the change of the sound image
accompanying the movement of the listening position is eliminated, it is possible to widen the
apparent sound source position. In addition, time correction of the distance difference from the
listening position to the plurality of speaker units is facilitated.
[0014]
According to the third aspect of the present invention, the plurality of speaker units are
configured to have a small aperture full range or coaxial type and have substantially the same
characteristics. Therefore, since the characteristics of the sound emitted from each speaker unit
are uniform, it is possible to obtain a wavefront that can be regarded as a substantially plane
wave.
[0015]
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Embodiments of the present invention will be described in detail with reference to the drawings.
In the drawings described below, the same parts as those in FIG. 8 are indicated by the same
reference numerals and the description will not be repeated. FIG. 1 shows an embodiment of the
speaker device according to the present invention, and main speakers 2 and 3 are disposed
inside a room surrounded by a wall 1. In the wall 1b facing the back wall 1a of each of the main
speakers 2 and 3, the sub-speaker device group 6 for the L channel and the sub-speaker device
group 7 for the R channel are embedded.
[0016]
Here, the sub-speaker device groups 6, 7 are mounted so that the opening end of the frame 9 of
each speaker unit 8 is substantially flush with the wall 1. In addition, each speaker unit 8 is a
small aperture full range or coaxial type. Furthermore, each of the sub speaker device groups 6,
7 is configured as shown in FIG. 2, for example. That is, each of the sub speaker device groups 6
and 7 is configured by four sub speaker devices 6 a to 6 d and 7 a to 7 d.
[0017]
Further, the dimensions by these are, for example, length × width = 180 cm × 90 cm. Further,
as shown in FIG. 3, for example, eight speaker units 8 each having a diameter of 10 cm and
having the same characteristics are provided in each of the sub speaker devices 6a to 6d and 7a
to 7d. Furthermore, the distance between the centers of the speaker units 8 is, for example, 15
cm. Note that these dimensions and the number of speakers are not unique and can be changed
according to the dimensions of each room.
[0018]
In the speaker apparatus having such a configuration, when the surround reproduction is
performed, the reproduction sound of the sound field feeling information is output from each of
the sub speaker apparatus groups 6 and 7 embedded in the wall 1. At this time, since the open
end of the frame 9 of each speaker unit 8 of each of the sub speaker device groups 6 and 7 is
made flush with the wall 1, substantially no planarity is caused without causing a sound wave
diffraction phenomenon. Wave front is obtained. Thereby, an appropriate surround effect can be
obtained.
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[0019]
Here, the reason why the sub-speaker device groups 6 and 7 are embedded such that the
opening end of the frame 9 of each speaker unit 8 is flush with the wall 1b is as follows. That is,
as shown in FIG. 4, when the sub-speaker device groups 6 and 7 are fixed to the surface of the
wall 1b or arranged close to each other, the outer peripheral edge portions of the sub-speaker
device groups 6 and 7 A diffraction phenomenon occurs. As described above, when the
diffraction phenomenon of the sound wave occurs, the wavefront is disturbed, so that the
frequency characteristic is disturbed or the wavefront is not flat.
[0020]
FIG. 5 shows an example in which delays of several ms to about 50 ms are simultaneously
applied to the sub speaker device groups 6 and 7 by a delay circuit (not shown). Here, the reason
for setting the delay value to about several ms to 50 ms is that if this value is deviated, the
original sound may be heard as another sound due to hearing. Since the apparent position of
each of the sub-speaker device groups 6 and 7 can be moved to the outside of the wall 1b by
such delay, it is possible to obtain an effect of producing an apparently wide space even if the
space is somewhat narrow. Can. Furthermore, in the case where delays are simultaneously
applied in this manner, for example, as shown in FIG. 6, the spherical center point of the
wavefront can be regarded as an apparent sound source position. The larger the area, the further
the apparent sound source position shifts.
[0021]
FIG. 7 shows a time delay obtained by dividing the distance corresponding to S2 ', S3' and S4 'by
the speed of sound for each speaker unit 8 of each of the sub speaker device groups 6 and 7 in
each longitudinal column. An example of the case is shown. With such delaying, the open end of
each speaker unit 8 of each of the sub speaker device groups 6 and 7 can be substantially equal
in position to the listening position R. That is, by correcting S4 + S4 '= S1, S3 + S3' = S1, and S2 +
S2 '= S1, the distances from the listening position R can be apparently made the same.
[0022]
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Also, in this way, when delay is applied to each vertical row of speaker units 8, even if the angle
of the wall 1 is different in the layout of the room, the angle of the wall surface The effect is
obtained (wall 1b ') as if it were apparently changed. Furthermore, as shown in FIG. 1, the
standing wave generated between the wall 1a on the side of the main speakers 2 and 3 and the
wall 1b on the side on which the sub-speaker device groups 6 and 7 are embedded has a value of
It can be prevented by applying different delays. That is, since the phase of the sound wave in the
same sound is shifted, the power of the standing wave is attenuated.
[0023]
As described above, in the present embodiment, the sub-speaker device groups 6 and 7 are
embedded in the wall 1b such that the opening end of the frame 9 of each speaker unit 8 is flush
with the wall 1b. Can be regarded as a substantially infinite baffle, whereby the diffraction
phenomenon of the sound wave can be prevented, and a wavefront that can be regarded as a
substantially plane wave can be obtained. Further, since a wave front that can be regarded as a
substantially plane wave can be obtained, the apparent sound source position can be made far by
delaying all of the speaker units 8 of the sub speaker device groups 6, 7 simultaneously.
[0024]
Furthermore, since the respective speaker units 8 of the sub-speaker device groups 6 and 7 can
be subjected to different delays for each row, it is possible to easily correct the difference in
distance from the listening position. Furthermore, since each of the sub-speaker devices 6a to 6d
and 7a to 7d is a flat type as shown in FIG. 3, it can be easily embedded in an architectural
module such as a wall.
[0025]
In the present embodiment, the case where the open end of the frame 9 of each speaker unit 8 is
exposed from the wall 1 has been described, but the present invention is not limited to this
example and the wall is covered with a cloth having acoustic transparency. This can give a
visually clear feeling. Moreover, although the case where each sub speaker device group 6, 7 is
embedded in the wall 1 has been described in the present embodiment, the present invention is
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not limited to this example and each sub speaker device group 6, 7 may be similarly embedded
by partitions. It is also good.
[0026]
Furthermore, although the present invention has been described as applied to the sub-speaker
apparatus in the present embodiment, the present invention is not limited to this example and
may be applied to the main speaker, and the effect as a surround speaker is great. . That is, this is
because it is more suitable for the reproduction of sound that is not required to have a sense of
localization or the like like sound field sensation information, rather than a sound that requires
the size of the sound image and the distance between the localization accurately.
[0027]
As described above, according to the speaker device of the present invention, the wall or
partition can be regarded as a substantially infinite baffle, whereby the diffraction phenomenon
of sound waves can be prevented, and a plurality of speakers can be obtained. Can be obtained as
a wavefront that can be regarded as a substantially plane wave. In addition, the main body of the
speaker device is not visually disturbed by being embedded or surrounded in the wall or
partition. Furthermore, since the change of the sound image accompanying the movement of the
listening position is eliminated, the apparent sound source position can be broadened.
Furthermore, it becomes easy to correct the difference in distance from the listening position to
the plurality of sub-speaker units. As a result, visual improvement can be achieved, and
appropriate sound field and presence can be obtained.
[0028]
【0028】
[0029]
Brief description of the drawings
[0030]
1 is a diagram showing a mounting state of the speaker device of the present invention.
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[0031]
2 is a front view showing the sub-speaker device group of FIG.
[0032]
3 is a perspective view showing the sub-speaker device of FIG.
[0033]
4 is a diagram for explaining the operation of the sub-speaker device group of FIG.
[0034]
5 is a diagram showing a state in which a delay is applied to the entire sub-speaker unit of FIG. 1
simultaneously.
[0035]
<Figure 6> It is the figure in order to explain the operation when the delay is applied to the entire
sub speaker unit at the same time at the same time.
[0036]
7 is a diagram showing a state in which the delay is applied to the sub-speaker unit of FIG. 1 line
by line.
[0037]
8 is a diagram showing an example of arrangement of conventional surround speakers.
[0038]
Explanation of sign
[0039]
1, 1a, 1b wall 2, 3 main speaker 6, 7 sub speaker device group 8 speaker unit 9 frame
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