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JPH0937384

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DESCRIPTION JPH0937384
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
multi-channel audio reproduction apparatus used in combination with a video reproduction
apparatus, and in particular, matching of a sound image with an image or an effective use of
auditory psychophysical properties. It is intended to realize surround reproduction.
[0002]
2. Description of the Related Art In recent years, even in ordinary homes, powerful movies and
the like are reproduced by combining a television (TV) with a large screen and a sound
reproducing device for reproducing multi-channel audio signals such as Dolby Pro Logic. Things
to enjoy are increasing.
[0003]
A conventional multi-channel audio reproduction apparatus combined with such a video
reproduction apparatus is a speaker apparatus for reproducing left channel signals installed on
the left and right sides of the TV 5 placed in front of the viewer 6, as shown in FIG. 2, a speaker
device 3 for reproduction of a right channel signal, a speaker device 1 for reproducing a center
channel signal provided on the upper side of the TV 5, and two for surround signal reproduction
provided in the lateral direction of the viewer 6 It comprises the speaker device 4 '.
[0004]
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In this multi-channel audio reproduction apparatus, the speaker devices 2 and 3 reproduce the
audio signals of the left and right channels, and the speaker device 1 mainly reproduces speeches
and the like on which the characters on the TV screen speak.
By providing the speaker device 1, the sense of localization of the speech can be greatly
improved.
Further, the speaker device 4 'reproduces a surround channel signal representing reverberation
sound and reflection sound, and the sound emitted from these speaker devices forms a realistic
sound field.
[0005]
However, in the conventional configuration, as shown in FIG. 11, since the signal of the center
channel is reproduced from the speaker device 1 installed on the TV 5, the sound image is
generally indicated by B. Formed in position. On the other hand, since the video is reproduced by
the TV 5 below the speaker device 1, there is a gap between the sound image position and the
video position, which causes the viewer to feel uncomfortable.
[0006]
As a solution to this point, as shown in FIG. 12, it can be considered to install two speaker devices
1 'for reproducing the center channel signal close to the left and right sides of the TV 5.
According to this configuration, the center channel signal is radiated from the left and right
speaker devices 1 'and synthesized, and a sound image can be formed at the central portion (C)
of the two speaker devices 1'. Therefore, it becomes possible to perform reproduction in which
the positions of the image and the sound image coincide.
[0007]
However, in the configuration shown in FIG. 12, for example, when the viewer views at a position
shifted to the left as shown in 6 ′, the sound image of the center channel is also shifted to the
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position of C ′, which makes the viewer uncomfortable. There is a problem of giving In addition,
since the speaker devices 2 and 3 for reproducing the audio signals of the left and right channels
have to be installed outside the speaker device 1 ′, a large installation space is required on the
left and right of the TV 5 . Also, if there are a large number of speakers on the left and right of
the screen, visual image viewing may be hampered.
[0008]
In order to avoid such a point, it is described in JP-A-4-270600 that, as shown in FIG. 13, two
speaker devices 1 ′ ′ for reproducing the center channel signal are disposed above and below
the TV 5. ing. When the speaker device 1 ′ ′ is arranged as described above, the sound image
can be placed at the position D ′, so that the reproduction can be performed in which the
positions of the sound image and the video coincide with each other. However, this configuration
leads to the problem that a large installation space is required on both the upper side and the
lower side of the TV 5.
[0009]
Also, when looking at the surround channel signal, this signal is a monaural signal but it is
originally an indirect sound component or a reverberation component signal, so in the
reproduction of the surround channel signal, the surround sound is radiated to a wider space and
the listener It is desirable that the surround reproduction be performed so as not to give a feeling
of oppression or localization to the
[0010]
However, since the conventional speaker device 4 'for the surround channel shown in FIG. 10 is
installed such that the main axis direction of the speaker unit is generally directed to the viewer,
the speaker device 4 having two monaural surround signals is arranged. When reproduced from
', a sound image is formed on the back of the viewer 6 as E, giving the viewer 6 a sense of
localization of sound and a sense of oppression, and the surround feeling is greatly impaired.
[0011]
As a countermeasure, as shown in FIG. 14, the main axis of the speaker unit is parallel to the wall
surface of the room by shifting the angle by 90 ° so that the main axis of the speaker unit 4
'does not face the viewer. It is conceivable to install it.
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However, in this case, it becomes impossible to embed in the wall in order to make the surround
channel speaker inconspicuous, and when this speaker is attached to the wall, a speaker unit
with a large aperture is attached Since the baffle surface is in the depth direction of the cabinet
as viewed from the viewer, the D dimension projecting from the wall becomes long, making it
very noticeable as a protrusion, giving a sense of oppression visually, and degrading the beauty
of the entire room. There is.
[0012]
The present invention solves such conventional problems, can easily match the image on the
screen of the image reproduction apparatus with the sound image, and without increasing the
projecting dimension from the wall of the speaker, An object of the present invention is to
provide a multi-channel audio reproduction device capable of giving an effective surround feeling
to a viewer.
[0013]
Therefore, in the present invention, a plurality of speakers including a left channel speaker and a
right channel speaker installed on the left and right of the video reproduction apparatus are
provided and used in combination with the video reproduction apparatus. In a multi-channel
audio reproduction apparatus, a center channel signal in which the level of a specific band within
a frequency band of 4 kHz or more is suppressed is reproduced by a speaker located above or
below the video reproduction apparatus, and the center channel signal of this specific band is
reproduced. Reproduction is performed by speakers located on the left and right of the video
reproduction apparatus.
[0014]
Further, at left and right positions of the video reproduction apparatus, sub-speakers that
exclusively reproduce the center channel signal of this specific band are provided.
[0015]
In addition, the center channel signal is input to the sub-speakers located on the left and right of
the video reproduction apparatus via the specific band pass means for passing only the specific
band, and the speaker located at the upper or lower side of the video reproduction apparatus The
center channel signal is input through specific band blocking means for blocking the passage of
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[0016]
Also, the center channel signal of this particular band is reproduced through the left channel
speaker and the right channel speaker.
[0017]
In addition, the left channel signal and the center channel signal of the specific band are added
and input to the left channel speaker, and the right channel signal and the center channel signal
of the specific band are input and input to the right channel speaker. ing.
[0018]
In addition, speakers for surround channels installed in the horizontal direction of the viewer are
mainly used as main speakers for reproducing surround channel signals in which the level of a
specific band within the frequency band of 4 kHz or more is suppressed, The sub-speaker has a
principal axis direction different by 90 °, and reproduces a surround channel signal of a specific
band.
[0019]
Further, the surround channel speaker is installed such that the main axis direction of the main
speaker is generally directed to the viewer.
[0020]
Further, the surround channel speaker is installed so that the main axis direction of the subspeaker is substantially opposite to the direction in which the video reproduction apparatus is
installed.
[0021]
In addition, a surround channel signal is input to the sub-speaker via a specific band pass unit
that passes only a specific band, and a surround channel signal is input to the main speaker via a
specific band blocking unit that blocks passage of a specific band. doing.
[0022]
In addition, this particular band is set to a band of approximately one octave centered at
approximately 6.3 kHz.
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[0023]
[Operation] When the level of a specific band in the frequency band of 4 kHz or more among the
audio signals, particularly, a band of approximately one octave centered on 6.3 kHz, is
suppressed, the viewer can position the sound source above and below Recognition of
In addition, when the sound image is vague and the sound source position is not clear, the viewer
feels that the sound image is in the direction of the sight being watched (vision priority effect).
In the present invention, these auditory and psychological characteristics are used.
[0024]
In the multi-channel audio reproducing apparatus according to the present invention, the center
channel signal except for the signal of this specific band is given to the center channel speaker
installed on the upper or lower side of the video reproducing apparatus. It becomes difficult to
recognize the sound source position of the speaker, and as a result, it is recognized as if there is a
sound image on the screen of the video reproduction apparatus by the effect of the visual
superiority.
In addition, since the signal of the specific band of the center channel signal is reproduced by the
left and right speakers at approximately the same position as the height of the screen, a sound
image of the specific band is also formed on the screen of the video reproduction apparatus.
Therefore, the viewer recognizes that the sound source position as the whole reproduced sound
of the center channel signal is on the screen, and feels that the sound image matches the image.
[0025]
In addition, since most center channel signals except for a specific band are reproduced by the
center channel speaker installed above or below the video reproduction apparatus, the sound
image of the center channel is from the center of the screen even when the viewing position is
shifted to the left or right. It does not shift.
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[0026]
Also, reproduction of the center channel signal of the specific band is performed using dedicated
sub-speakers provided on the left and right of the screen, and speakers for the left and right
channels.
Since a small-aperture speaker can be used for the sub-speaker, a large installation space is not
necessary even when providing it, and it does not interfere with visual image viewing.
When the left and right channel speakers are used, the conventional speaker device can be used
as it is only by changing the circuit configuration.
[0027]
Further, since a surround channel signal excluding a specific band is given to the main speaker of
the surround speaker, the sound image of the reproduced sound of the surround channel
becomes vague, and it is difficult to form a sound image on the back of the viewer.
In addition, the surround channel signal of the specific band is reproduced as indirect sound
from the sub-speaker disposed so as not to direct the direction of the viewer, so that the viewer
does not feel a sense of localization.
As a result, effective surround reproduction can be realized.
[0028]
Since this sub-speaker only needs to reproduce high frequencies, a small-aperture speaker can be
used.
Therefore, even when the main speaker is attached to the front of the cabinet and the sub-
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speaker is attached to the side, the depth dimension of the speaker device does not increase so
much.
Further, the surround speaker device can be embedded in the wall to such an extent that the
small-diameter secondary speaker is not buried in the wall surface.
In addition, even when the surround speaker is directly attached to the wall surface, the
projecting dimension from the wall surface is small, and a visual sense of oppression is not given,
and the appearance of the room is not impaired.
[0029]
Further, by directing the main axis of the sub-speaker in the opposite direction to the video
playback device, playback sound in a specific band is emitted to the rear of the viewer, effectively
expanding the surround.
[0030]
Further, by setting the specific band to one octave centered at 6.3 kHz, a sense of coincidence
between the sound image and the image and an effective surround feeling can be obtained
particularly.
Further, in this case, it is possible to use a sound generator made of a piezoelectric element for
the sub-speaker, and the present effect can be realized without increasing the cost.
[0031]
(First Embodiment) In the multi-channel audio reproduction apparatus of the present invention,
in order to make the image and the sound image coincide with each other, a characteristic on
auditory psychology is used.
Therefore, first, this auditory-psychological characteristic will be described.
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[0032]
A large number of experiments on sound source recognition have been performed so far, and
various reports have been made.
For example, Fujiki, Takuya, Maruyama et al., On the frontal virtual sound image in
stereophonics (Electroacoustic Study Material, EA 81-16, 1981), and Kurosawa, Miyagi, et al.,
Head transfer function and direction discrimination ability Of the Society of Acoustics, Vol 38,
43.66. In Qp, 1982), the sound source perception in the median plane, ie, front-to-bottom
direction, perceives changes in the frequency characteristics at high frequencies above about 4
kHz (this change is caused by the presence of a head or pinna etc.) It is stated that it is done by.
Therefore, in the case of a sound source without this high frequency signal, it can be said that the
vertical position of the median plane is difficult to recognize.
[0033]
With reference to these documents, as shown in FIG. 7, five speakers SP were installed in the
front median plane of the subject T to conduct a trial listening experiment. As the sound source,
as shown in FIG. 8, one octave band elimination noise whose signal has been removed over one
octave band is used, and five kinds of signals having different center frequencies fc of one octave
band are used. The subjects were randomly presented from each of the loudspeakers SP, and the
subjects were asked by numbers to indicate from which position of the five loudspeakers the
presented sound was heard.
[0034]
FIG. 9 shows the result of this experiment, in which the number (vertical axis) answered at a
position different from the position of the presented sound source is summarized for each center
frequency fc (horizontal axis) of the band elimination noise . From the figure, it is understood that
when fc is set to 5 kHz or more, the number of incorrect answers increases. Among them, it is
understood that the number of erroneous answers is the largest when fc is 6.3 kHz.
[0035]
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From this result, it is known that high frequency components of about 4 kHz or more are
necessary to recognize the sound source position in the vertical direction, and the sound source
recognition in the vertical direction becomes ambiguous when there is no signal in this band. The
It has been found that, particularly when there is no signal in a band centered around 6.3 kHz,
the sound source recognition in the vertical direction becomes very difficult.
[0036]
Also, described in "Basic experiments on interaction between large screen TV image and stereo
sound image-sound image localization in the vertical direction-" (Hearing Research Institute
Material, H-81-33, 1981) by Komiyama, Nakabayashi, Nikaido et al. It is widely known that visual
information has priority over auditory information, as it has been. That is, the sound image tends
to be attracted to the gazing visual direction. The effect is greater as the sound image is less clear
and the sound source is less noticeable.
[0037]
Actually, when a speaker device is installed on a television and a trial listening experiment is
performed by a real source, when a signal component of 4 kHz or more of an audio signal
emitted from the speaker device is removed, a sound image and an image are obtained. It turned
out that it becomes easy to agree with. Furthermore, it was found that when the dip circuit
removes only the signal in the vicinity of 6.3 kHz, which had the highest number of false answers
in the sound source recognition audition experiment in the vertical direction, it is particularly
easy to obtain a sense of coincidence between the sound image and the image. . The sense of
coincidence between the sound image and the image obtained at this time is considered to be
due to the visual priority effect.
[0038]
The multi-channel audio reproduction device of the present invention takes advantage of such
auditory and psychological characteristics in its configuration. The apparatus of the first
embodiment is a center channel signal reproduction apparatus in this multi-channel audio
reproduction apparatus. This device, as shown in FIG. 1, is a center channel main speaker 1a
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installed on the upper side of the TV 5 and a center channel located on the front of left and right
channel speaker devices 2 and 3 installed on the left and right of the TV 5 Auxiliary speaker 1b,
a dip circuit (specific band blocking means) 1c for removing a specific frequency band from the
center channel signal input to the main speaker 1a, and a band for narrowing the center channel
signal input to the auxiliary speaker 1b to only a specific frequency band And a pass circuit
(specific band pass means) 1d.
[0039]
The center channel sub-speaker 1 b is provided at a position substantially at the same height as
the height of the central portion of the TV 5. Further, the center frequency of the pass blocking
band of the dip circuit 1c and the center frequency of the pass band of the band pass circuit 1d
are set to about 6.3 kHz. The frequency characteristic of this dip circuit 1c is shown as M in FIG.
4, and the frequency characteristic of the band pass circuit 1d is shown as S in the same figure.
[0040]
In this apparatus, a sound image A of the radiation sound from the center channel main speaker
1a is formed in front of 1a. However, since the sound around 6.3 kHz is removed by the dip
circuit 1c in the reproduced sound from the main speaker 1a, it is very difficult to recognize the
sound source in the vertical direction of the radiated sound from the main speaker 1a in terms of
hearing. As a result, the visual priority effect is psychologically attracted to the image, and the
sound image is recognized at the position of A ′ on the screen of the TV 5.
[0041]
Also, the sound around 6.3 kHz emitted from the two center channel sub-speakers 1b is
reproduced at substantially the same height as the screen, and a sound image Aa is formed at
approximately the center of the screen.
[0042]
As a result, the center channel signal is a combination of the sound image A ′ recognized on the
screen and the sound image Aa formed on the screen, with excellent sound quality, and in a state
where the sound image matches the image. Be regenerated.
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[0043]
Further, since most of the band of the center channel signal is reproduced by the main speaker
1a, the sound image of the center channel signal is localized near the center even if the viewing
position is shifted to the left and right.
[0044]
In addition, since it is sufficient for the sub-speaker 1b to be able to reproduce only the high
frequency, a small diameter speaker unit can be used, and the speaker devices 2 and 3 can be
attached without increasing the size.
In addition, when the specific band is set to a band of about one octave centered on 6.3 kHz, it
becomes possible to use a low-cost sounding body using a piezoelectric element as a sub-speaker,
which also enables cost reduction. Become.
[0045]
The center channel signal main speaker 1a can be installed not on the TV but on the lower side
of the TV, and the same effect can be obtained in this case as well.
[0046]
Second Embodiment The multi-channel audio reproduction apparatus according to the second
embodiment distributes the center channel signal to be sent to the center channel sub-speaker to
the left channel speaker and the right channel speaker in a circuit manner. The same effect as in
the first embodiment is obtained without using the auxiliary speaker.
[0047]
As shown in FIG. 2, this device has, as a circuit configuration, an audio input means 11 to which
an audio signal is input from a laser disk player, VTR or the like, and L (left), C (center) and R
Right) Channel demultiplexing means 12 such as Dolby Pro Logic decoder for demultiplexing
into signals, specific band-passing means 13 for selectively passing only the signal C ′ in a
specific band of the demultiplexed C signal, and Specific band blocking means 14 for limiting the
level of the band substantially the same as the specific band, gain adjusting means 15 for
adjusting the level of the signal C ', and adding means 16 for adding the level adjusted C' signal
to the L signal , Adding means 17 for adding the level-adjusted C 'signal to R signal, power
amplification means 18 for amplifying a signal input to the center channel speaker device 1, and
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left channel speaker Power amplification means 19 for amplifying a signal to be input to the
feeder device 2 and power amplification means 20 for amplifying a signal to be input to the right
channel speaker device 3 are provided.
[0048]
The particular band pass means 13 passes only signals of a band of approximately 4 kHz or
more, and the particular band blocking means 14 limits signals of a band of approximately 4 kHz
or more.
[0049]
Further, as shown in FIG. 3, the center channel speaker device 1 is installed on the TV 5, and the
left channel speaker device 2 and the right channel speaker device 3 are installed on the left and
right of the TV 5.
[0050]
In this multi-channel audio reproduction apparatus, the audio signal input from the audio input
means 11 is divided into L (left), C (center) and R (right) signals by the channel demultiplexing
means 12 and then each signal processed. , Reproduced by each speaker device.
The center channel signal C ′ ′ whose level of the specific band is limited by the specific band
block means 14 is amplified by the power amplification means 18 and input to the center
channel speaker device 1.
The center channel speaker device 1 reproduces this signal C ′ ′ to form a sound image A at
the position of the speaker device 1.
However, since the signal of the band of 4 kHz or more is limited by the specific band block
means 14 in the signal C ′ ′, the sound source position is difficult to recognize as in the first
embodiment.
Therefore, the sound image is attracted to the image by the visual priority effect, and the viewer
recognizes the sound image at the position of A '.
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[0051]
Further, the signal C ′ of the specific band which has passed through the specific band pass
means 13 of the center channel signal C is gain-adjusted by the gain adjustment means 15 and
then inputted to the addition means 16 and the addition means 17.
The addition means 16 adds the gain adjusted C 'signal and the L channel signal to output a
signal L', and the addition means 17 adds the gain adjusted C 'signal and the R channel signal.
Signal R 'is output.
[0052]
The signal L 'is amplified by the power amplification means 19 and then input to the left channel
speaker device 2, and the left channel speaker device 2 reproduces this signal L'.
Further, the signal R 'is amplified by the power amplification means 20 and then input to the
right channel speaker device 3, and the right channel speaker device 3 reproduces this signal R'.
Since the center channel signal C 'added to the signal L' and the signal R 'is reproduced by the
speaker devices 2 and 3 installed on the left and right of the TV 5, the sound image Aa of C' is
formed at the center of the screen.
[0053]
As a result, as in the first embodiment, the center channel signal C is reproduced with excellent
sound quality and in a state where the sound image matches the image.
[0054]
In this device, the speaker device of the conventional configuration can be used as it is, and the
wiring of the power amplification means and the speaker device can be the same as before, so
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the sound image and the image can be more easily compared to the first embodiment. Can be
realized.
In addition, the configuration of the speaker device can be simplified, and can be provided at low
cost.
[0055]
The same effect can be obtained even if the center channel speaker device 1 is installed below
the TV.
[0056]
Third Embodiment The apparatus of the third embodiment relates to a surround channel speaker
apparatus installed in the lateral direction of a viewer in a multi-channel audio reproduction
apparatus.
[0057]
In the configuration of the surround channel speaker apparatus, the result of the following trial
listening experiment is used.
[0058]
In the trial listening experiment using the center speaker installed on the TV as a real source,
when the image of the TV is stopped and only the sound emitted from the center speaker is
evaluated, the band of approximately 4 kHz or more from the sound signal, especially 6 It has
been found from the subject that removing the signal in the band near 3 kHz makes the sound
image larger and more ambiguous.
From this, it is considered that the above-mentioned frequency band is not only necessary for
recognizing the sound source position, but also affects clear sound image formation and sound
image localization feeling.
In addition, this audition result appears not only when the speaker apparatus is installed in the
front but also when installed in the lateral direction, and the sound image becomes large by
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removing the above-mentioned frequency band from the audio signal, which is unclear. It turned
out that it became.
[0059]
Based on the result of this trial listening experiment, as shown in FIG. 5, in the surround channel
speaker apparatus of the third embodiment, the main speaker unit 4a attached to the baffle
surface facing the viewer and the side of the cabinet are attached An auxiliary speaker unit 4b, a
dip circuit 4c for removing a specific frequency band from a surround channel signal input to the
main speaker unit 4a, and a band pass circuit 4d for narrowing the surround channel signal input
to the auxiliary speaker unit 4b to only a specific frequency band Is provided.
[0060]
The center frequency of the pass stop band of the dip circuit 4c and the center frequency of the
pass band of the band pass circuit 4d are set to about 6.3 kHz.
The frequency characteristics of the dip circuit 4c and the band pass circuit 4d are M and S in
FIG. 4, respectively.
[0061]
As shown in FIG. 6, two surround channel speaker devices 4 are installed in the lateral direction
of the viewer 6.
The surround channel signal is reproduced from the main speaker unit 4a whose main axis is
directed in the direction of the viewer and the sub-speaker unit 4b whose main axis direction is
directed backward. The reproduced sound from the main speaker unit 4a contains almost no
signal around 6.3 kHz due to the function of the dip circuit 4c. Therefore, the sound image of the
reproduced sound of the surround channel becomes vague, and it becomes difficult for the
viewer to recognize the sound image of the back of the head.
[0062]
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On the other hand, the reproduction sound of the surround channel signal near 6.3 kHz is
emitted to the rear of the viewer by the sub-speaker unit 4b provided on the side of the cabinet.
Since this reproduced sound is reproduced as an indirect sound, it does not give the viewer a
sense of sound localization.
[0063]
A wider sound field AS is formed by the reproduced sound from the main speaker 4a in which
the sound image is ambiguous and the reproduced sound from the auxiliary speaker 4b diffused
backward.
[0064]
As a result, it is possible to reproduce a surround with excellent spread feeling without giving the
viewer a sense of localization or a sense of pressure.
[0065]
The sub-speaker unit 4b attached to the side of the cabinet only needs to be able to reproduce
high frequencies, so a small-speaker speaker unit can be used.
Therefore, the depth dimension D of the cabinet can be reduced, and the projecting dimension
when the cabinet is mounted on the wall is reduced.
[0066]
In each embodiment, the case of combining the multi-channel audio reproduction apparatus with
the television has been described, but the multi-channel audio reproduction apparatus of the
present invention can of course be combined with other video reproduction apparatus such as a
movie. It is.
[0067]
As is apparent from the above description of the embodiment, the multi-channel audio
reproducing apparatus of the present invention reproduces the center channel signal with
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excellent sound quality in a state where the sound image and the video coincide with each other.
be able to.
In addition, even when the listening position moves to the left and right, the reproduced sound of
the center channel signal is localized near the center.
[0068]
In addition, even when sub-speakers for reproducing a specific band of the center channel signal
are provided in the right and left channel speaker devices for this purpose, a speaker unit with a
small aperture or a sound generator of piezoelectric element can be used as the sub-speaker.
There is no need to increase the size of the channel speaker apparatus or to increase the
installation space.
[0069]
In addition, in an apparatus that adds a signal in a specific band of the center channel signal to
the signal of the left and right channels by signal processing, the arrangement of speakers and
the like can be left as it is in the prior art to match the sound image and the video.
[0070]
In addition, the surround channel signal reproduction apparatus can reproduce a surround with
excellent sense of expansion without feeling of localization or pressure, without increasing the
depth dimension of the cabinet.
[0071]
Brief description of the drawings
[0072]
1 is a front view showing the configuration of the multi-channel audio reproduction device of the
first embodiment,
[0073]
2 is a block diagram showing a circuit configuration of the multi-channel audio reproduction
device of the second embodiment,
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[0074]
3 is a front view showing a speaker arrangement of the multi-channel audio reproduction device
of the second embodiment,
[0075]
4 is a frequency characteristic diagram of the speaker and the signal of the multi-channel audio
reproduction device of each embodiment.
[0076]
5 is a diagram showing the configuration of a surround channel speaker device in the multichannel audio reproduction device of the third embodiment,
[0077]
6 is a plan view showing a speaker arrangement in the multi-channel audio reproduction device
of the third embodiment,
[0078]
Fig. 7 An explanatory view showing a vertical direction sound source recognition experiment
method,
[0079]
Figure 8: Frequency characteristics of the signal used in the vertical direction source recognition
experiment,
[0080]
Fig. 9 An explanatory view showing the result of the vertical direction sound source recognition
experiment,
[0081]
10 is a plan view showing the speaker arrangement of the conventional multi-channel audio
reproduction device,
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[0082]
11 is an explanatory view showing a sound image position in the conventional multi-channel
audio reproduction device,
[0083]
12 is a plan view showing another speaker arrangement in the conventional multi-channel audio
reproduction device,
[0084]
13 is an explanatory view showing another speaker arrangement and sound image position in
the conventional multi-channel audio reproduction apparatus.
[0085]
14 is a plan view showing another surround speaker arrangement in the conventional multichannel audio reproduction device.
[0086]
Explanation of sign
[0087]
A Sound image by the main speaker for center channel A 'Recognition sound image Aa Sound
image by the secondary speaker for center channel As, B', E Surround sound field B, C, C ', D'
Sound image by the speaker for center channel SP1-5 Speaker T Subject 1, 1 ', 1 "center channel
speaker 1a center channel main speaker 1b center channel secondary speaker 1c, 4c dip circuit
1d, 4d band pass circuit 2 left channel speaker 3 right channel speaker 4, 4' surround channel
Speaker 4a Surround Channel Main Speaker Unit 4b Surround Channel Secondary Speaker Unit 5
Television 6, 6 'Viewer 7 TV Base 11 Audio Input Means 12 Channel Demultiplexing Means 13
Characteristic Band Passing Means 14 Characteristic Band Blocking Means 15 Gain Adjustment
Means 16, 17 Addition means 18, 19, 20 Power amplification means
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