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DESCRIPTION JP2004120387

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DESCRIPTION JP2004120387
The present invention provides an acoustic device that generates high-quality musical sound by
suppressing deterioration of sound due to interference of sounds generated from a plurality of
speakers and change in timbre due to a listening position. SOLUTION: An effector circuit 4 for
outputting an acoustic signal obtained by applying an effect to a signal waveform of an acoustic
signal of original sound distributed for two channels, and an acoustic signal obtained by applying
an original and an acoustic signal of original sound alternate from each speaker When an audio
signal of the original sound is output from one of the speakers at least during a predetermined
period, the other speaker outputs an acoustic signal to which an effect is applied. And a
microcomputer 9 for controlling the switching circuits 2, 3, 5, and 6. [Selected figure] Figure 1
Sound equipment
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
acoustic device for distributing a plurality of acoustic signals output from a sound source and
outputting the signals from different speakers. 2. Description of the Related Art In general, in an
audio device of a stereo system installed indoors, a stereo audio signal is transmitted to a speaker
system on the left side and two channels of a left (L) channel and a right (R) channel. It is
outputting to the right speaker system. However, in the on-vehicle acoustic device, two speakers
are disposed on the front side, two speakers on the rear side, and four speakers in the vehicle.
FIG. 14 is a conceptual view showing a system configuration of a conventional on-vehicle
acoustic device, and FIG. 15 is a layout view showing positions of four speakers of the acoustic
device. As shown in these figures, a stereo sound source 10 from a recording medium such as a
CD or MD is distributed to the front and rear and output to each speaker. In the four speakers,
the left channel speaker 11L and the right channel speaker 11R are disposed on the front side,
and the left channel speaker 12L and the right channel speaker 12R are disposed on the rear
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side. However, in the above-mentioned conventional audio apparatus, although the stereo output
is obtained in the left and right direction, the same audio signal (same signal) is obtained in the
front and back direction. It has become. For this reason, there is a problem that the sound
characteristics are deteriorated due to the sound interference caused by the front and rear
speakers, and the timbre change due to the listening position becomes large. [0005] Note that
the configuration of such a conventional sound device is extremely general, and the number of
documents describing such a configuration is enormous, and the most appropriate prior art
documents are disclosed as specific prior art documents. It is extremely difficult to do. Therefore,
the configuration of a general sound device which has already been known to those skilled in the
art as described above is an example of the prior art. The present invention has been made in
view of the above problems, and an object of the present invention is to suppress sound
deterioration due to interference of sounds generated from a plurality of speakers and timbre
change due to listening positions. An acoustic device that generates sound with high quality
acoustic characteristics. SUMMARY OF THE INVENTION In order to achieve the above object, an
acoustic device according to the present invention is an acoustic device that distributes a
plurality of acoustic signals output from a sound source to a plurality of different speakers. A
waveform modification means for outputting a second acoustic signal obtained by transforming
the signal waveform of the first acoustic signal distributed into a plurality of components, the
first acoustic signal, the second acoustic signal, and the speakers When the first sound signal is
output from one of the speakers at least in a predetermined period, the second sound signal is
output from the other speaker, and the signal output means alternately outputs the second sound
signal. And control means for controlling the signal output means.
Therefore, according to the sound device of the present invention, when the first sound signal
which is the original sound is output from one of the plurality of speakers at least for a
predetermined period, the first sound signal is output from the other speaker. Since control is
performed so that the second acoustic signal obtained by deforming the signal waveform of the
signal is output, the deterioration of the sound due to the interference of the sounds generated
from the plurality of speakers and the timbre change due to the listening position are
suppressed, Sound having high acoustic characteristics can be generated. In the sound device of
the present invention, the signal output means alternately outputs the first sound signal and the
second sound signal for a predetermined period. Therefore, according to the audio apparatus of
the present invention, the deterioration of sound due to the interference of sounds generated
from a plurality of speakers and the change in timbre due to the listening position are
suppressed, and the sound originally generated in monaural is also simulated. Stereo sound can
be obtained, and sound with high quality acoustic characteristics can be generated. In the sound
device of the present invention, the control means controls the signal output means such that
sound signals outputted from the speakers are always different from each other. Therefore,
according to the audio apparatus of the present invention, the deterioration of sound due to the
interference of sounds generated from a plurality of speakers and the change in timbre due to
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the listening position are suppressed, and the sound originally generated in monaural is also
simulated. Stereo sound can be obtained, and sound with high quality acoustic characteristics can
be generated. In the sound device of the present invention, the control means controls the signal
output means to change the output time of the first sound signal and the second sound signal.
Therefore, according to the audio apparatus of the present invention, it is possible to suppress
the deterioration of the sound due to the interference of the sounds generated from the plurality
of speakers and the timbre change due to the listening position, and to strengthen the sense of
delay of the sound. , Can produce sound with high quality acoustic characteristics. BEST MODE
FOR CARRYING OUT THE INVENTION Embodiment 1 of the acoustic device of the present
invention will be described below based on the drawings. FIG. 1 is a conceptual view showing a
system configuration of an acoustic device according to the first embodiment. The output of the
stereo sound source 1 from a recording medium such as a CD or MD is input to the common
terminal 2c of the switching circuit 2 on the front side and the common terminal 3c of the
switching circuit 3 on the rear side. Incidentally, since the output of the stereo sound source 1 is
an acoustic signal of two channels on the left and right, it goes without saying that the signal
lines are also constituted by two systems.
However, since the signal processing in the first embodiment (the same as in the second
embodiment to be described later) is the same for both the left channel sound signal and the
right channel sound signal, the drawing and the description will be simplified. Therefore, signal
processing for the acoustic signals of the left and right channels will be collectively described.
One switching terminal 2 b of the switching circuit 2 on the front side and one switching
terminal 3 a of the switching circuit 3 on the rear side are connected to the input side of the
effect circuit 4. The other switching terminal 2a of the switching circuit 2 on the front side is
connected to one switching terminal 5a of another switching circuit 5 on the front side. The
other switching terminal 3b of the switching circuit 3 on the rear side is connected to one
switching terminal 6b of another switching circuit 6 on the rear side. The output side of the
effect circuit 4 is connected to the other switching terminal 5 b of the switching circuit 5 on the
front side and the other switching terminal 6 a of the switching circuit 6 on the rear side. The
common terminal 5c of the switching circuit 5 on the front side is connected to the speaker 7L
for the left channel on the front side and the speaker 7R for the right channel. Further, the
common terminal 6c of the rear side switching circuit 6 is connected to the rear side speaker 8L
for the left channel and the speaker 8R for the right channel. In addition, although an amplifier
circuit and other signal processing circuits are actually provided between the switching circuits 5
and 6 and the corresponding speakers, they are not directly related to the present invention, and
thus the description thereof is omitted. The microcomputer 9 is connected to the four switching
circuits 2, 3, 5 and 6 by control lines shown by dotted lines in the figure, and is control means for
controlling switching of each switching circuit in accordance with a control program
incorporated therein. It is. That is, each switching circuit is signal output means for outputting
the stereo sound source 1 to each speaker under the control of the microcomputer 9. Further,
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the effect circuit 4 is a signal deformation unit that performs an effect process on the signal
waveform of the input acoustic signal (first acoustic signal) and outputs a deformed acoustic
signal (second acoustic signal). As effect processing by the effect circuit 4, a single sound source
is a signal to enhance the high-frequency component of the acoustic signal, such as a chorus
effect that deforms the signal waveform so that the sounds of a plurality of sound sources are
sounding simultaneously. There are an enhancer effect that deforms the waveform, and a
compressor effect that compresses the dynamic range of the signal waveform to prevent
distortion of the acoustic signal. The actual connection state of the microcomputer 9, the four
switching circuits 2, 3, 5, 6 and the effect circuit 4 is considerably more complicated than that
shown in FIG.
Further, the microcomputer, the switching circuit, and the effect circuit can be configured by a
DSP (digital signal processor) which is a single LSI. That is, as described above, the system
configuration of FIG. 1 is a conceptual diagram (the same applies to FIG. 12 of the second
embodiment to be described later), and is for explaining the operation of this acoustic device.
Next, various aspects (first to eighth aspects) of the operation in the first embodiment will be
described with reference to FIGS. 1 and 2 to 11. FIG. 2 is a timing diagram when the front side
and rear side acoustic signals are subjected to the effect processing according to the first
embodiment (this is generally referred to as “applying an effect”). In this first aspect, at the
time t1 under the control of the microcomputer 9, the common terminals 2c and 5c of the
switching circuit 2 and the switching circuit 5 are connected to the switching terminals 2b and
5b, and the switching circuit 3 and the switching circuit The six common terminals 3c and 6c are
connected to the switching terminals 3b and 6b. Therefore, at time t1, the acoustic signal on the
front side is input to the effect circuit 4, and the acoustic signal subjected to the effect is output
to the speakers 7L and 7R on the front side. On the other hand, at the same time t1, the rear side
acoustic signal is output to the rear side speakers 8L and 8R as the original sound. As a result, as
shown in FIG. 2, at the first time t1, when an effect is applied to the signal waveform on the front
side, an effect is not applied to the signal waveform on the rear side, and the original sound
remains. At the next time t1, common terminals 2c and 5c of switching circuit 2 and switching
circuit 5 are connected to switching terminals 2a and 5a, and common terminals 3c and 6c of
switching circuit 3 and switching circuit 6 are switching terminals. Connect to 3a and 6a.
Therefore, at time t1, the rear side acoustic signal is input to the effect circuit 4, and the acoustic
signal subjected to the effect is output to the rear side speakers 8L and 8R. On the other hand, at
the same time t1, the sound signal on the front side is output to the speakers 7L and 7R on the
front side as the original sound. As a result, as shown in FIG. 2, at the second time t1, when an
effect is applied to the rear side signal waveform, an effect is not applied to the front side signal
waveform, and the original sound remains. After that, effects are alternately applied to the front
side or the rear side every time t1, and at any timing (time t1), different acoustic signals are
transmitted to the respective speakers on the front side and the rear side. Although it is output,
overall, an effect corresponding to the effect width y1 is applied under the same conditions on
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the front side and the rear side.
The smaller the value of y1, the closer to the original sound, and the larger the value of y1, the
different from the original sound. FIG. 3 is a diagram showing a signal waveform of a music
signal when a compressor effect is applied to the front side or the rear side. In this figure, the
waveform shown by the solid line is the signal waveform of the original sound, and the waveform
shown by the dotted line is the signal waveform to which the effect of the compressor effect is
applied. As shown in this figure, both the front side and the rear side have compression effects
under the same conditions, and since the signal waveforms on the front side and the rear side are
different at any timing, interference of sound can be suppressed. As described above, effects are
alternately applied to the front side or the rear side at fixed time intervals, and at any timing,
different acoustic signals are output to the respective speakers on the front side and the rear
side, In the layout diagram of FIG. 4 showing the positions of the four speakers, pseudo stereo
sound is obtained between the front side speaker 7L and the rear side speaker 8L in the left
channel. Similarly, a pseudo stereo sound can be obtained between the front side speaker 7R and
the rear side speaker 8R in the right channel. FIG. 5 is a timing chart when the front side and rear
side acoustic signals are subjected to an effect according to the second embodiment. In this case,
the effect width y2 is smaller than in the case of the effect width y1 in FIG. Such an effect is
effective when it is not desirable to break the original sound very much. FIG. 6 is a timing chart
when the front side and rear side acoustic signals are subjected to an effect according to the
third aspect. In this case, the effect width y3 is larger than in the case of the effect width y1 in
FIG. Such an effect is effective when it is desired to emphasize the effect. FIG. 7 is a timing chart
when the front side and rear side acoustic signals are subjected to an effect according to the
fourth aspect. In this case, the cycle (time t2) for alternately applying effects to the front side or
the rear side is longer than the cycle (time t1) in FIG. Since the space characteristic of the sound
field differs according to the size of the vehicle and the distance between the front side speaker
and the rear side speaker, it is possible to cope with various sound fields in the vehicle by
changing the period to which the effect is applied. The cycle of applying the effect is registered in
the memory 40 of the microcomputer 9 by the setting operation of the user.
FIG. 8 is a timing chart when the front side and rear side acoustic signals are subjected to an
effect according to the fifth aspect. In this case, the time t4 at which the original sound is output
is longer than the time t3 at which the sound applied with the effect is output on both the front
side and the rear side. Such an effect is effective, as in the case of the second aspect, in the case
where the original sound is not likely to be broken. Further, in the fifth aspect, considering the
masking effect that the original sound or effect sound of a certain period has on the effect sound
or original sound of the next period, the output time of the original sound is utilized utilizing this
characteristic. By taking as long as possible, it is possible to reduce the sense of discomfort in
hearing and obtain a stereo effect with a natural feeling. In this example, the times t5 and t6 at
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which the original sound is output on both the front side and the rear side are in the range of 0
≦ t5, t6 ≦ (t4-t3). By changing the times t5 and t6 in this range, the stereo effect between the
front side and the rear side can be finely adjusted. FIG. 9 is a timing diagram when the front side
and rear side acoustic signals are subjected to the effect according to the sixth aspect. This is an
example in which time t5 in FIG. 8 is zero. In this case, for those who are listening on the front
side, after listening to the effect sound on the front side, after listening to the effect sound on the
rear side, the residual sound of the original sound is long, so the sense of delay becomes stronger
. On the contrary, in the example in which t5 is set to zero, the sense of delay of the sound
becomes stronger for the person listening on the rear side. FIG. 10 is a timing chart when the
front side and rear side acoustic signals are subjected to the effect according to the seventh
aspect. In this case, the time for which the effect is applied is randomly controlled. In this
example, the effect sound on the rear side follows the effect sound on the front side. On the
contrary, after the effect sound on the rear side, a pattern may be considered in which the effect
sound on the front side follows. In any of the patterns, the sense of delay of the sound becomes
strong. FIG. 11 is a timing chart when the front side and rear side acoustic signals are subjected
to the effect according to the eighth mode. In this case, the time t10 at which the effect is applied
to the front side is longer than the time t11 at which the effect is applied to the rear side.
Therefore, the effect is emphasized on the front side and closer to the original sound on the rear
side. On the contrary, on the rear side, the effect is emphasized, and on the front side, a pattern
closer to the original sound may be considered. As described above, according to the first
embodiment of the present invention, when an acoustic signal of the original sound is output
from one of the front and rear speakers during at least a predetermined period, the other speaker
Since control is performed so that an acoustic signal obtained by applying an effect to the signal
waveform of the original acoustic signal and outputting a deformed acoustic signal, the
deterioration of the sound due to the interference of the sound generated from the front and rear
speakers, and the listening position The tone change can be suppressed to generate a sound with
high quality acoustic characteristics. Further, according to the first embodiment of the present
invention, since the period for applying the effect is freely set by the setting operation of the
user, the distance between the speakers on the front side and the rear side, and the space
characteristic inside the vehicle Can produce sounds with high quality acoustic characteristics.
Next, a second embodiment of the present invention will be described with reference to FIGS. 12
and 13. FIG. 12 is a block diagram showing a system configuration of the audio device in the
second embodiment. In this figure, the same components as those of the first embodiment shown
in FIG. 1 are denoted by the same reference numerals. The system configuration of FIG. 12
differs from the system configuration of FIG. 1 in that in the case of the configuration of FIG. 12,
independent effect circuits 41 and 42 are provided on the front side and the rear side,
respectively. The other configuration is the same as that of the first embodiment in FIG. The
control lines (shown by dotted lines in the figure) connected from the microcomputer 9 to the
respective switching circuits are also substantially the same as in the case of FIG. 1, but in the
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case of FIG. Since the effect circuits 41 and 42 are provided, the microcomputer 9 can apply an
effect to the front side and the rear side at any timing. FIG. 13 is a timing diagram in the case
where effects are applied to the front side and rear side acoustic signals independently. As shown
in this figure, it is also possible to overlap the time when the effect is applied to one of the front
side or the rear side and the time when the other is applied. In particular, in this example, the
time for applying the effect to transform the original sound and outputting it on both the front
side and the rear side is longer than the time for outputting the original sound as it is without
applying the effect.
As described above, according to the second embodiment of the present invention, since the
effects are applied to the front side acoustic signal and the rear side acoustic signal in various
patterns, the front side and the rear side in various sound fields are applied. While being able to
suppress the deterioration of sound due to the interference of the sound generated from the
speaker and the change in timbre due to the listening position, it becomes possible to create a
special sound field according to the user's preference. In each of the above-described
embodiments, the path passing through the effect circuit and the path not passing through the
effect circuit are switched. However, the effect circuit is provided on all the signal paths, and the
effect circuit is turned on. Control may be performed to switch off. Further, in each of the above
embodiments, the configuration is such that the signal waveform is modified by applying an
effect to a stereo sound source having two channels on the left and right, but an effect is applied
to a monaural sound source of a single channel. The signal waveform may be deformed to be
pseudo-stereolized. According to the sound apparatus of the present invention configured as
described above, when the first sound signal which is the original sound is output from one of
the plurality of speakers at least for a predetermined period, Since control is performed so that a
second acoustic signal obtained by deforming the signal waveform of the first acoustic signal is
output from the other speaker, deterioration of sound due to interference of sounds generated
from a plurality of speakers, and listening position It is possible to generate a sound with high
quality acoustic characteristics by suppressing the tone change due to. BRIEF DESCRIPTION OF
THE DRAWINGS FIG. 1 is a block diagram showing a system configuration of a vehicle-mounted
acoustic device in a first embodiment of the present invention. FIG. 2 is a timing chart when the
effect of the first aspect in the first embodiment of the present invention is applied. FIG. 3 is a
diagram showing a signal waveform of a music signal when an effect of a compressor effect is
applied in the first mode in the first embodiment of the present invention. FIG. 4 is a layout view
showing the positions of four speakers in the acoustic device of the first embodiment of the
present invention. FIG. 5 is a timing chart when the effect of the second aspect in the first
embodiment of the present invention is applied. FIG. 6 is a timing chart when the effect of the
third aspect in the first embodiment of the present invention is applied. FIG. 7 is a timing chart
when the effect of the fourth aspect in the first embodiment of the present invention is applied.
FIG. 8 is a timing chart when the effect of the fifth aspect in the first embodiment of the present
invention is applied.
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FIG. 9 is a timing chart when the effect of the sixth aspect in the first embodiment of the present
invention is applied. FIG. 10 is a timing chart when the effect of the seventh aspect in the first
embodiment of the present invention is applied. FIG. 11 is a timing chart when an effect of the
eighth aspect in the first embodiment of the present invention is applied. FIG. 12 is a block
diagram showing a system configuration of an acoustic device in a second embodiment of the
present invention. FIG. 13 is a timing diagram when an effect is applied in the second
embodiment of the present invention. FIG. 14 is a block diagram showing a system configuration
of a conventional on-vehicle acoustic device. FIG. 15 is a layout view showing positions of four
speakers in a conventional on-vehicle acoustic device. [Explanation of the code] 1 sound source
2, 3, 5, 6 switching circuit (signal output means) 4, 41, 42 effect circuit (signal deformation
means) 9 microcomputer (control means) 40 memory (storage means) 7L left side of front side
Speaker 7R Right front speaker 8L Rear left speaker 8R Rear right speaker
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