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JPH06105390

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DESCRIPTION JPH06105390
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio signal reproduction apparatus such as a stereo apparatus, and in particular, the position of
the audio signal reproduction apparatus and a listener (user) according to the environment
where the audio signal reproduction apparatus is installed. The present invention relates to an
audio signal reproduction apparatus capable of providing a listener with the most appropriate
reproduction sound depending on the relationship.
[0002]
2. Description of the Related Art Improvements and improvements have been made in terms of
how high-quality reproduced sound can be provided by a stereo device on a CD or a record
board. On the other hand, devices have been devised to give the highest sound quality to the
environment such as a room in which a stereo device is installed.
[0003]
Whether the highest sound quality is provided to the listener depends on the type and nature of
the sound to be reproduced. For example, the nature of the sound of classical music and the
nature of the sound as music such as jazz are different. Therefore, in a stereo device, it is
preferable to perform reproduction processing according to the nature of such a sound.
08-05-2019
1
Conventional stereo devices other than stereo devices used for specific business use or specific
mania etc. are subjected to a wide range of audio signal improvement measures that can be
widely used by various users. As a method of improving such a stereo device itself, for example, a
means for creating a stereo effect in a stereo device, a means for creating a surround effect, etc.
are taken. In addition, the stereo device is provided with means for changing the balance
between the two, means for effectively making treble or means for effectively making bass, and
means capable of providing an arbitrary sound effect according to the desire of the listener.
[0004]
Even though the above-described various functions are added to the stereo device to provide
more effective sound, the stereo sound to be heard by the listener through the speaker is not
limited. Depending on the environment where the stereo device is installed, even if the room in
which the stereo device is installed is acoustically poor regardless of how high the stereo device
is prepared, even if such a stereo device is used There may be cases where a sufficiently high
quality playback sound can not be obtained. Also, relatively low cost stereo devices have
limitations in the various functions and their performance described above. In addition to this
performance limit, if the environment in which the stereo device is installed is acoustically poor,
reproduced sound with even higher sound quality can not be obtained.
[0005]
The present invention applies an audio signal reproduction apparatus such as a stereo device to
an environment in which the audio signal reproduction apparatus is installed by a relatively
simple method to fully exhibit the functions and performance of the audio signal reproduction
apparatus. SUMMARY OF THE INVENTION An object of the present invention is to provide an
audio signal reproducing apparatus capable of providing a reproduced sound with sufficient
sound quality that a user (listener) can fully satisfy.
[0006]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and achieve the
above object, the present invention adds an artificial intelligence (AI) processing function to an
audio reproduction apparatus such as a stereo apparatus, and any one of the following: Control
the tone, that is, take measures to improve the environment.
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2
(1) The reproduction sound signal is corrected in consideration of the reverberation such as the
hardness of the wall on which the sound signal reproduction device is installed. (2) The
reproduction sound signal is corrected in consideration of the installation height of the speaker.
(3) The reproduction acoustic signal is corrected in consideration of the installation interval of
one pair of speakers. (4) The reproduction acoustic signal is corrected in consideration of the
distance between a pair of speakers and the positional relationship between the speakers and the
listener. In the present invention, the various measures described above can be combined
arbitrarily.
[0007]
According to a first aspect (form) of the present invention, a means for setting the degree of
reverberation, and a means for correcting the gain of the high frequency component of the
reproduced acoustic signal according to the degree of reverberation set by the reverberation
setting means An acoustic signal reproduction apparatus is provided. According to the second
aspect of the present invention, means for setting the installation height of the speaker, and
means for correcting the gain of the low frequency component of the acoustic signal according to
the height of the speaker set by the speaker height setting means An acoustic signal reproduction
apparatus is provided. According to the third aspect of the present invention, the phase and the
level relative to the sum of the right acoustic signal and the left acoustic signal are changed
according to the means for setting the distance between a pair of speakers and the distance
between the set speakers. An acoustic signal reproduction device is provided which comprises
the new right acoustic signal and the means for generating the left acoustic signal. According to a
fourth aspect of the present invention, there is provided a means for setting the distance between
a pair of speakers, a means for setting the distance of the listener from the installation position of
these speakers, and the above-mentioned distance between the speakers and the listener for the
speaker. An acoustic signal reproduction apparatus is provided which has a delay time of the
right acoustic signal or the left acoustic signal output from the speaker according to the distance
and means for correcting the level.
[0008]
Further, according to the present invention, an acoustic signal reproduction device is provided in
which various forms of the above-described acoustic signal reproduction device are combined
arbitrarily. As the combination, the following combinations are possible. Table 1-1st form 2nd
form 3rd form 4th form 1st combination ○ ○ 2nd combination ○ ○ 3rd combination ○ ○ 4th
combination ○ ○ ○ 5th combination ○ ○ ○ ○ 6th combination ○ ○ 7th combination ○ ○
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8th combination ○ ○ ○ 9th combination ○ ○
[0009]
The reproduction stereo sound is greatly influenced by the reverberation of the environment
where the sound signal reproduction apparatus, in particular, the speaker is installed. For
example, depending on the degree of reverberation such as the degree of hardness of the wall of
the room in which the speaker is installed, the degree of absorption and reflection of the sound
output from the speaker varies. In a first aspect (form) of the present invention, a user (listener)
sets the degree of reverberation in an environment where a sound reproducing apparatus is
installed, in particular, a speaker is installed. Acoustic signal correction means in the sound
reproduction apparatus corrects the gain of the high frequency component of the reproduction
acoustic signal according to the degree of reverberation set by the reverberation setting means to
compensate for the reverberation of the reproduction stereo sound.
[0010]
The low frequency characteristics of the reproduction stereo sound change according to the
installation height of the speaker. In the second aspect of the present invention, the user sets the
installation height of the speaker, and the gain of the low frequency component of the acoustic
signal is set according to the height of the speaker set by the speaker height setting means in the
sound reproducing apparatus. Make corrections to correct low-frequency characteristic changes.
[0011]
The stereo sound effects differ depending on the distance between a pair of speakers. For
example, placing the speakers close together results in a sound closer to monaural sound than
stereo sound, and when the speaker is too far, it becomes an acoustic with gaps (stereo sound is
clearly separated and independent sound can not be called stereo sound, Become). According to
the third aspect of the present invention, the user sets the distance between the pair of speakers,
and the phase relative to the sum of the right and left sound signals according to the distance
between the speakers set in the sound reproducing apparatus. A new right acoustic signal and a
left acoustic signal with varying levels are generated to maintain the stereo acoustic effect.
08-05-2019
4
[0012]
Depending on the distance between the pair of speakers and the distance between these speakers
and the listener, the stereophonic sound effect is different. In the fourth aspect of the present
invention, the user sets the distance between the pair of speakers and the distance between the
listener and the installation position of these speakers, and sets the above-mentioned distance
between the speakers and the speaker in the sound reproducing apparatus. The delay time and
the level of the right side acoustic signal or the left side acoustic signal output from the speaker
are corrected according to the distance of the listener to provide stereo sound.
[0013]
When the first to fourth embodiments described above are combined as appropriate, the
individual effects described above are combined.
[0014]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As an audio signal reproducing
apparatus to be described below, a typical stereo apparatus which is used by a normal user who
is not a maniac in a room of about 6 to 8 mats is exemplified.
In other words, a stereo device that can be relatively easily adapted to an environment in which
the stereo device is installed to obtain stereo sound with tone control (sound correction), which is
relatively easy for a user who does not have familiar skills and knowledge about the stereo
device. I will illustrate.
[0015]
FIG. 1 is a diagram illustrating the configuration of a stereo device as a first embodiment of an
audio signal reproduction device according to the present invention. The stereo device of the first
embodiment corrects the reverberation of an environment such as a stereo device, in particular, a
room in which a speaker is installed. In the stereo device shown in FIG. 1, the left acoustic signal
input terminal 2L to which the left acoustic input signal AUD1 which is one of the stereo input
signals is applied, and the right acoustic input signal AUDR which is the other of the stereo input
signals Acoustic signal input unit 2 including right acoustic signal input terminal 2R, ADC 3L for
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5
converting left acoustic input signal AUDl as an analog signal applied to left acoustic signal input
terminal 2L into digital signal, right acoustic input signal AUDR as analog signal And an analogto-digital converter 3 composed of an ADC 3R for converting the According to the circuit
configuration described above, the left acoustic input signal AUD1 and the right acoustic input
signal AUDR applied to the acoustic signal input unit 2 are converted into digital acoustic signals.
The reason why the analog audio signal is converted into the digital audio signal in this way is to
adapt it to digital signal processing to be described later.
[0016]
The stereo device further includes a dynamics processing unit 4 including a left dynamics
processing unit 4L and a right dynamics processing unit 4R, an equalizing processing unit 5
including a left equalizer 5L and a right equalizer 5R, and a surround processing unit 6. The
dynamics processing unit 4, the equalization processing unit 5 and the surround processing unit
6 constitute an active sound processing unit 7. The dynamics processing unit 4, the equalization
processing unit 5, and the surround processing unit 6 perform the same dynamics processing,
equalization processing, and surround processing as in the prior art under the control of the
sound processing control unit 1 composed of a microcomputer etc. And perform the same active
sound processing as before. The stereo device of the present invention does not necessarily
require such active sound processing, but from the viewpoint of stereo sound processing, an
example of active sound processing will be described below.
[0017]
The stereo device further includes a high frequency band tone control unit 8 comprising a left
high band tone control circuit 8L and a right high band tone control circuit 8R, a digital / analog
signal converter 18 comprising DAC 18L and DAC 18R, and A pair of speakers 19 consisting of
19R is provided. The left and right active sound processing signals S6L and S6R from the
surround processing unit 6 are applied to the digital / analog signal conversion unit 18 through
the high frequency band tone control unit 8 and are used as the left and right analog
reproduction sound signals S18L and S18R as the speaker 19L. , 19R. Stereo reproduction sound
is output from the pair of speakers 19L and 19R. In the stereo device of this embodiment, the
high frequency band tone control unit 8 described in detail and means 21a for inputting the
hardness of the wall are added. Further, with the addition of the high frequency band tone
control unit 8 and the means 21a for inputting the hardness of the wall, the processing content
of the sound processing control unit 1 is corrected.
08-05-2019
6
[0018]
In this embodiment, the degree of reverberation of the environment in which the speaker 19 is
installed is set as the degree of hardness (or softness) of the wall of the room in which the
speaker 19 is installed. Fig. 2 shows the hardness of the wall and the pitch and reverberation
(attenuation) characteristics. In a room with a soft wall, the level of sound is high, but the sound
is absorbed by the wall and decays quickly. On the other hand, when the wall is hard, the sound
height is low, but it is reflected by the wall without being absorbed and the attenuation time is
long. In FIG. 2, the integral of the sound in the soft wall is equal to the integral of the sound in
the hard wall. The user sets the degree of hardness of the wall in the following five stages
through the means 21a for inputting the hardness of the wall. (1) Level 1: Very soft (2) Level 2:
Slightly soft (3) Level 3: Standard hardness (softness) (4) Level 4: Slightly hard (5) Level 5: Very
hard of these The hardness level can be set according to the manual of the stereo equipment as a
standard. Alternatively, a listener who is a user of the stereo device may determine subjectively
or empirically as the relative levels of these hardness levels. When one of the above hardnesses is
input from the means 21a for inputting the hardness of the wall by the user, the sound
processing control unit 1 instructs the high frequency band tone control unit 8 a correction
curve corresponding to the hardness.
[0019]
The left high band tone control circuit 8L and the right high band tone control circuit 8R in the
high frequency band tone control unit 8 are variable gain amplifier circuits that change the gain
of the input acoustic signal based on the correction curve shown in FIG. have. The left high band
tone control circuit 8 L and the right high band tone control circuit 8 R correct the output signals
S 6 L and S 6 R from the surround processing unit 6 with the same characteristics based on the
set reverberation level from the sound processing control unit 1. The correction in the high
frequency band tone control unit 8 in this example performs the following correction on the high
frequency signal component of 2.5 KHZ or more in this example. (A) For a very soft wall: Add 2
dB of signal. (B) In the case of a slightly soft wall: Add 1 dB of signal. (C) Standard hardness
(softness): Uncorrected (d) In the case of a slightly hard wall: Subtract the signal by 1 dB. (E) For
a very hard wall: Subtract the signal by 2 dB. For example, if the wall is very soft, the reproduced
sound is absorbed so much that the level of the reproduced sound is increased by 2 dB to correct
it. On the other hand, if the wall is hard, the level of reproduced sound is reduced. By this
correction, the reproduced sound corrected according to the hardness of the wall of the room in
which the stereo device is installed is output from the left speaker 19L and the right speaker 19R
by a simple method. As described above, the degree of stiffness of the wall as the degree of
08-05-2019
7
reverberation can be easily set by the user who does not require expert knowledge.
[0020]
The degree of hardness of the wall can be considered as an example of the degree of
reverberation. Therefore, the correction curve as illustrated in FIG. 3 can be created in
consideration of the reverberation of the environment in which the stereo device is installed, and
the reproduced sound can be corrected according to the correction curve. In that case, the
listener sets the degree of reverberation in the sound processing control unit 1 through the input
means 21a for inputting the hardness of the wall.
[0021]
FIG. 4 is a block diagram of a stereo device according to a second embodiment of the audio signal
reproduction device of the present invention. The stereo device corrects the sound according to
the installation height of the pair of speakers 19. Therefore, this stereo device has a low
frequency band tone control unit 9 in place of the high frequency band tone control unit 8
shown in FIG. FIG. 5 is a diagram illustrating that the propagation characteristics of sound, in
particular, the bass, differ according to the height of the speaker 19 from the floor 20. A highpitched speaker 191 is disposed at the top of the speaker 19 and a low-pitched speaker 192 is
disposed at the bottom. The output sound from the high-pitched speaker 191 tends to go straight
with a narrow directivity, and there are few components to be diffused. On the other hand, the
output sound from the bass speaker 192 has wide directivity, and in addition to the component
going straight, there are many components to be diffused. Therefore, the component of the
output sound from the bass speaker 192 toward the floor 20 is also considerable, and is reflected
by the floor 20 to reach the listener. The sound reflected by the floor 20 and directed to the
listener depends on the installation height of the speaker 19 relative to the floor 20. Therefore, in
order to provide better stereo reproduction sound, the stereo reproduction sound is corrected to
the speaker 19 according to the height h1 or h2 from the floor 20. The low frequency band tone
control unit 9 corrects the sound signals S6L and S6R from the surround processing unit 6 in
accordance with the correction curve illustrated in FIG.
[0022]
The listener first sets the height h1 or h2 of the bottom of the speaker 19 from the floor 20 via
08-05-2019
8
the means 21b for inputting the height of the speaker. The reference of the height may be based
not only on the floor 20 but, for example, the height of the listener's ears, but in this
embodiment, it is based on the floor 20. The standard height of the speaker 19 with respect to
the floor 20 is in the range of about 0 to 2 m on the premise that this stereo device is a general
stereo device and installed in a room of about 6 to 8 mats. Therefore, for example, the
installation heights of the speakers 19 are set as levels 1 to 5 as described below. Table-2 Height
level Estimated height Actual height 5 Pretty high Height 1.5m or more 4 Slightly high 50cm ~
1.5m 3 Standard height 50cm 2 Slightly low 20 ~ 50cm 1 Quite low height same as floor
[0023]
The sound processing control unit 1 receives any one of the height levels from the means 21b for
inputting the height of the speaker, and the left low band tone control circuit 9L and the right
low band tone control circuit in the low frequency band tone control unit 9 At 9R, the acoustic
signal output from the surround processing unit 6 is corrected according to the level, for
example, according to the correction curve shown in FIG. For this reason, the left low band tone
control circuit 9L and the right low band tone control circuit 9R each have a correction curve
shown in FIG. 6 and have variable gain amplifier circuits capable of adjusting the gain of the
input signal. The left low band tone control circuit 9L and the right low band tone control circuit
9R perform the same correction. The correction curve shown in FIG. 6 corresponds to the height
levels 5 to 1 from above. For example, in the case of the height level = 3, the left low band tone
control circuit 9L (as well as the right low band tone control circuit 9R) is not corrected. In the
case of the height level = 5, the left side audio signal S6L from the left side low band tone control
circuit 9L surround processing unit 6 is raised by +2 dB over the frequency band of 300 Hz or
less. When the height level is 1, the left side audio signal S6L from the left side low band tone
control circuit 9L surround processing unit 6 is lowered by −1 dB over 300 Hz or less. As
described above, by correcting the height of the speaker 19 with respect to the floor surface 20,
the listener can obtain good reproduction stereo sound without being greatly affected by the
installation height of the speaker 19. In addition, since good reproduction stereo sound can be
obtained without being greatly affected by the installation height of the speaker, the speaker can
be installed at any height in a limited room, and the installation condition of the stereo device is
relaxed. As described above, the height setting of the speaker 19 is about five steps as described
above, and in particular, it can be easily set even by a user who does not have specialized
knowledge.
[0024]
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9
FIG. 7 is a block diagram of a stereo device according to a third embodiment of the audio signal
reproduction device of the present invention. The third embodiment relates to a stereo apparatus
which provides good reproduction sound without dependency on the installation interval of the
pair of speakers 19. This stereo device is provided with a speaker width sound adjusting unit 10
in place of the high frequency band tone control unit 8 in the stereo device shown in FIG. The
speaker width acoustic adjustment unit 10 includes a first variable gain amplification circuit 11,
a second variable gain amplification circuit 12, a first signal addition circuit 13, and a second
signal addition circuit 14. Each of the first variable gain amplifier circuit 11 and the second
variable gain amplifier circuit 12 can also be configured as a multiplication circuit that multiplies
the input signal by the correction coefficient. Normally, the pair of left and right speakers 19L
and 19R is installed in the room with a distance of about 50 cm to 1 m, but the distance between
the left and right speakers 19L and 19R varies depending on the indoor conditions. For example,
when the left speaker 19L and the right speaker 19R are disposed adjacent to each other without
a gap, monaural reproduced sound without a sense of stereo is obtained. On the other hand, if
the left speaker 19L and the right speaker 19R are separated too far, stereo sound is completely
separated from the left and right sides. The stereo apparatus according to the third embodiment
corrects such a reduction in reproduced stereo sound depending on the installation interval
between the left speaker 19L and the right speaker 19R. As this correction, the phase of the
reproduced sound is changed to create a virtual image (virtual sound).
[0025]
The user sets the distance between the left speaker 19L and the right speaker 19R through the
means 21c for inputting the distance between the speakers. This interval is set at the following
level in consideration of a normal room. Table 3 Speaker Spacing Level Actual Spacing Correction
factor k1 Correction factor k21 Approx. 0 cm -0.25 -0.252 about 20 cm-about 0.125-0.1253
about 50 cm 0 04 about 1 m 0.125 0.1255 1. 5 m or more 0.25 0.25 In Table 2, the correction
coefficient k1 represents the gain of the first variable gain amplifier circuit 11 (or the
multiplication coefficient of the first multiplication circuit), and the correction coefficient k2 is
the second variable gain The gain of the amplification circuit 12 (or the multiplication factor of
the second multiplication circuit) is shown. When the sound processing control unit 1 receives
the speaker spacing level via the loudspeaker spacing input means 21c, the correction
coefficients k1 and k2 are set to the first variable gain amplifier circuit 11 according to the levels
shown in Table 3 The second variable gain amplifier circuit 12 is set.
[0026]
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10
For example, when the left speaker 19L and the right speaker 19R are adjacent to each other and
the listener sets the gap level to 1 in the means 21c for inputting the gap of the speakers, the
sound processing control unit 1 sets the first variable gain amplifier circuit 11 and The
correction coefficients k1 = -0.25 and k2 = -0.25 of the second variable gain amplifier circuit 12
are set. As a result, the corrected acoustic signals S10L and S10R represented by the following
equations from the first signal addition circuit 13 and the second signal addition circuit 14 in the
speaker width acoustic adjustment unit 10 are output. S10L = S6L-0.25.S6RS10R = S6R-0.25.S6L
In this manner, the sound image is spread by adding the reverse (-) phase signals respectively,
and the left speaker 19L and the right speaker 19R are adjacent to each other. You can get
stereo reproduction sound based on the virtual sound even if you Further, when the listener sets
the interval level to 5 in the means 21c for inputting the interval of the speaker, the acoustic
processing control unit 1 corrects the correction coefficient k1 of the first variable gain amplifier
circuit 11 and the second variable gain amplifier circuit 12 = Set 0.25 and k2 = 0.25. As a result,
the corrected acoustic signals S10L and S10R represented by the following equations from the
first signal addition circuit 13 and the second signal addition circuit 14 in the speaker width
acoustic adjustment unit 10 are output. S10L = S6L + 0.25 · S6RS10R = S6R + 0.25 · S6L By
adding the positive (+) phase signals in this way, even if the left speaker 19L and the right
speaker 19R are far apart, they are close to a monaural gap. There is no stereo reproduction
sound. Furthermore, when the listener sets the spacing level to 3 in the means 21c for inputting
the spacing of the loudspeakers, the sound processing control unit 1 corrects the correction
coefficient k1 of the first variable gain amplifier circuit 11 and the second variable gain amplifier
circuit 12 = Set 0, k2 = 0. As a result, the first signal addition circuit 13 and the second signal
addition circuit 14 in the speaker width acoustic adjustment unit 10 output the acoustic signals
S10L and S10R that are not corrected. That is, in this example, the stereo device is designed
based on the case where the left side speaker 19L and the right side speaker 19R are installed
approximately 50 cm apart. The same applies to the other interval levels.
[0027]
In the above-mentioned example, although the example which set up the interval of left-hand side
speaker 19L and right-hand side speaker 19R as a rough level was described, you may set a
concrete interval as numerical value from means 21c which inputs the interval of a speaker. In
that case, data indicating the relationship between the interval and the correction coefficient is
stored in the sound processing control unit 1, and the correction coefficient is picked up
according to the value indicating the interval to correct the reproduction stereo sound as
described above. Can.
[0028]
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11
FIG. 8 is a block diagram of a stereo device as a fourth embodiment of the sound reproducing
device according to the present invention. The stereo device of the fourth embodiment corrects
the reproduced stereo sound signal in consideration of the position of the speaker and the
position of the listener. The stereo device shown in FIG. 8 is provided with an acoustic signal
delay / level adjustment unit 16 in place of the high frequency band tone control unit 8 of the
stereo device shown in FIG. The acoustic signal delay / level adjustment unit 16 has a left delay
circuit 16L1, a left variable amplifier circuit 16L2, a right delay circuit 16R1, and a right variable
amplifier circuit 16R2.
[0029]
FIG. 9 is a diagram illustrating the position (interval) of the left speaker 19L and the right
speaker 19R and the distance of the listener to the speaker. In this example, a speaker 19 is
installed in a room of 3 m × 3 m in a room, and a listener listens to reproduction stereo sound
from the left speaker 19L and the right speaker 19R in this room. When the left speaker 19L and
the right speaker 19R are arranged at the positions shown by solid lines, the stereo effect is
different between when the listener is in the zone Z22 and when it is in the zone Z31. Also, even
if there is a listener in the same zone Z22, the stereo effect is different when the left speaker 19L
and the right speaker 19R are in the position shown by the solid line and in the position shown
by the broken line. As illustrated in FIG. 10, when the listener is in the zone Z22, the left speaker
19L and the right speaker 19R are at approximately the same position, so correction may not be
performed in the stereo device, but when the listener is in the zone Z31 If the left speaker 19L is
virtually retracted by the distance D3 to the position indicated by the broken line, the balance is
broken. In order to balance the left speaker 19L and the right speaker 19R, moving the left
speaker 19L from the position shown by the solid line to the position shown by the dashed line
corresponds to the distance D3 of the output sound from the left speaker 19L. The delay is
equivalent to a decrease in the level of the reproduction speaker sound as much as the distance
D3.
[0030]
The listener sets its position (zone) through the means 21d for inputting the position of the
listener. According to the zone setting, the sound processing control unit 1 delays the delay in
the left delay circuit 16L1 or the right delay circuit 16R1 based on a preset interval between the
left speaker 19L and the right speaker 19R, for example, 50 cm as a standard interval. The time
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is determined, and the delay time is set to the left delay circuit 16L1 or the right delay circuit
16R1, and the gain of the variable amplification circuit at the subsequent stage of the delayed
circuit is further increased according to the delay time. Adjust the The sound processing control
unit 1 determines the delay time, for example, as follows. The sound processing control unit 1
calculates the distance between the left speaker 19L and the right speaker 19R and the distance
between these speakers and the listener, and the distance between the listener and the other
speaker from one of the speakers located closer to the listener A retracting distance D3 to be
virtually retracted to a position substantially equal to the value of d is determined by calculation.
The sound processing control unit 1 further calculates the time for sound to propagate as the
backward distance D3 and sets it as the delay time of the left delay circuit 16L1 or the right
delay circuit 16R1. Further, the sound processing control unit 1 increases the gain of the left side
variable amplification circuit 16L2 or the right side variable amplification circuit 16R2 so as to
compensate for the sound attenuated by the backward distance. By adjusting the phase and level
in the acoustic signal delay / level adjustment unit 16, the listener can listen to the reproduced
sound from the left speaker 19L and the right speaker 19R in a balanced manner regardless of
the zone.
[0031]
The delay time and gain depend on the distance between a pair of speakers and the distance
between the speakers and the listener. Therefore, when the distance between the left speaker
19L and the right speaker 19R is different, the above-described retraction distance D3 is also
different. Although the interval between the left speaker 19L and the right speaker 19R can be
fixed as, for example, 50 cm as a standard interval as described above, the delay described above
using the speaker interval setting data described in the third embodiment Time and gain can be
calculated. As a result, it is possible to obtain an effective reproduction stereo sound independent
of the distance between a pair of speakers and the distance between the speakers and the
listener.
[0032]
A modification of the fourth embodiment will be described. In the acoustic signal delay / level
adjustment unit 16 shown in FIG. 8, only one of the left delay circuit 16L1 and the left variable
amplifier circuit 16L2 or the right delay circuit 16R1 and the right variable amplifier circuit
16R2 is provided, and the other circuit is provided. It can be omitted. For example, in the
distance (position) relationship between the speaker and the listener shown in FIG. 9, when the
listener listens only to one zone, for example, Z11, Z21, Z31, the right delay circuit 16R1 and the
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right variable amplifier circuit 16R2 becomes unnecessary.
[0033]
The first to fourth embodiments described above have independent functions and effects.
Therefore, it is also possible to combine these embodiments as appropriate. In the present
invention, all combinations are possible as listed below. Table 4 Combinations First Example
Second Example Fourth Example 1 ○ ○ (Verification of reverberation and height correction of
loudspeakers) 2 ○ ○ (Verification of reverberations and spacing correction of loudspeakers) 3
○ ○ Correction and distance correction of the speaker with respect to the position of the
listener 4 ○ ○ (height and distance correction of the speaker) 5 ○ ○ (distance correction of the
speaker with respect to the height of the speaker and the position of the listener) 6 ○ ○
(distance between the speaker and the listener 7 ○ ○ ○ (Speaker distance correction with
respect to speaker spacing and listener position) 8 ○ ○ ○ ○ (Deverberation correction, speaker
height correction, speaker spacing with respect to speaker distance and listener position)
Distance correction of 9) ○ ○ ○ (Speaker height correction, speaker distance correction with
respect to speaker spacing and listener position)
[0034]
FIG. 11 is a block diagram of a stereo device when the first to fourth embodiments are combined.
This stereo device includes an audio signal input unit 2, an analog / digital conversion unit 3, a
dynamics processing unit 4, an equalize processing unit 5, a surround processing unit 6, a high
frequency band tone control unit 8 according to the first embodiment, and a second embodiment.
Low frequency band tone control unit 9 related to the third embodiment, speaker width sound
adjustment unit 10 related to the third embodiment, acoustic signal phase / level adjustment unit
16 related to the fourth embodiment, digital / analog signal conversion unit 18, speaker unit 19,
acoustic processing control Part 1 and means 21 for inputting environmental conditions. As the
means 21 for inputting environmental conditions, the means 21a for inputting the hardness of
the wall, the means 21b for inputting the height of the speaker, the means 21c for inputting the
spacing of the speaker, and the means 21d for inputting the position of the listener are
integrated. It is The sound processing control unit 1 performs the processing of the first to fourth
embodiments described above. Therefore, according to this stereo device, all the abovementioned corrections can be performed. The above-mentioned environment setting, for
example, setting of the hardness of the room, setting of the spacing of the speakers, etc. can be
easily set even for a user who does not have expert knowledge. In particular, since the abovementioned environment setting does not set the speaker interval with an absolute numerical
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value, for example, if the environment where the stereo device is installed can not obtain
sufficient sound quality with the set speaker interval, the next level is obtained. It is
advantageous to be able to empirically determine the most suitable condition for the
environment in which the stereo device is installed. Of course, for example, the spacing of the
speakers can also be set accurately in cm units.
[0035]
Although the embodiment described above exemplifies a stereo device used in a relatively
narrow room, the acoustic signal reproduction device of the present invention is not limited to
such embodiment, and can be applied to other acoustic signal reproduction devices. In addition,
in order to facilitate the setting of the environmental conditions mentioned above, an example
was shown where it was set as a stepwise level or a relative value. For example, setting of
speaker spacing, setting of speaker height etc. It can also be set with a numerical value.
[0036]
In the above embodiment, an example is shown in which the acoustic signal to be corrected is
subjected to active acoustic processing in the dynamics processing unit 4, the equalization
processing unit 5 and the surround processing unit 6, but when carrying out the present
invention, Applicable regardless of the presence or absence of active sound processing.
[0037]
According to the sound signal reproducing apparatus of the present invention, the best
reproduction sound can be provided according to the environment in which the sound signal
reproducing apparatus is installed.
Corrections for this include speaker spacing correction, speaker height correction, reverberation
correction, speaker spacing and speaker position correction with respect to the speaker, etc.
These individual corrections can be made and they are combined as appropriate Corrections can
also be made. By performing the correction adapted to such an environment, the restriction on
installing the sound signal reproducing apparatus is reduced, and the time and effort for
maintaining the environment for installing the sound reproducing apparatus is reduced.
Furthermore, the above-mentioned correction of the present invention can be easily made by
ordinary non-professional users to be compatible with the current environment.
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