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JPH057399

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DESCRIPTION JPH057399
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio apparatus for reproducing two-channel audio signals for left and right, and more
particularly to an audio apparatus capable of switching the sound field characteristic according
to the genre.
[0002]
2. Description of the Related Art In recent years, sound field characteristics have been added to
2-channel audio signals (stereophonic signals), and conventionally, for example, measurement
data of impulse response of various real sound fields or data based thereon That simulates the
real sound field by convoluting the sound signal into a voice signal using a digital signal
processor (DSP), or that focuses on only the frequency transfer characteristic of the sound field
and corrects or changes it is there. On the other hand, there are some in which the frequency
characteristic is selectively changed depending on the genre of the music to be listened to
enhance the sound effect. This is intended to be able to instantly reproduce the position of each
element of the graphic equalizer in advance.
[0003]
However, those using conventional digital signal processors are complicated in hardware
configuration and expensive, and are difficult to apply to low-cost audio equipment, while
frequency components are difficult to use. Those that change only the characteristics are difficult
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to obtain sufficient sound field characteristics.
[0004]
SUMMARY OF THE INVENTION In order to solve the above problems, the present invention
solves the above-mentioned problems by a first addition / subtraction means for adding or
subtracting audio signals of two channels, and delaying the audio signal added or subtracted by
the first addition / subtraction means. Delay means, level adjustment means for adjusting the
level of the audio signal delayed by the delay means, addition means for adding the audio signal
adjusted by the level adjustment means to one channel, and adjustment by the level adjustment
means And adding means for adding or subtracting the audio signal to or from the other channel,
and selecting means for selecting a genre of music.
Also, the delay means circulates a part of the delayed audio signal.
[0005]
The sound field suitable for the genre by controlling the subtraction or addition of the first and
second adders and the delay time of the delayer and the level of the level adjuster according to
the music genre selected by the selector. Get the effect.
[0006]
Embodiments of the present invention will be described below with reference to the attached
drawings.
FIG. 1 is a block diagram of the first embodiment of the acoustic apparatus according to the
present invention, FIG. 2 is a block diagram of the second embodiment, FIG. 3 is a block diagram
of combination A of addition and subtraction in the first embodiment, and FIG. 5 is a block
diagram of the combination C of addition and subtraction in the first embodiment, FIG. 6 is a
block diagram of the combination D of addition and subtraction in the second embodiment, and
FIG. FIG. 8 is a block diagram of the delay means F, and FIG. 9 is a block diagram of the delay
means G. As shown in FIG.
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[0007]
In the first embodiment of FIG. 1, the first addition / subtraction means 1 is referred to as the left
channel (hereinafter referred to as the L channel). Audio signal and the right channel (hereinafter
referred to as R channel). (E.g., subtract the level of the R channel from the level of the L
channel). )する。 The delay means 2 delays the audio signal added or subtracted by the first
addition / subtraction means 1. The level adjustment means 3 adjusts the level of the audio
signal delayed by the delay means 2. The addition means 4 may be an L channel (R channel)
which is one of the channels of the audio signal adjusted by the level adjustment means 3. ) And
output as the L channel audio signal. The second adding and subtracting means 5 may be an R
channel (L channel) which is the other channel of the audio signal adjusted by the level adjusting
means 3. Or R channel (L channel). ) And output as an audio signal of the R channel. Selection
means 6 selects a genre of music. The controller 7 adds or subtracts the first and second adders /
subtractors 1 and 5 according to the genre selected by the selector 6, and determines the delay
time of the delayer 2 and the level of the level adjuster 3. It controls and is constituted by a
microcomputer or a logic circuit.
[0008]
Next, a second embodiment of FIG. 2 will be described. The audio signal output from the delay
means 2 is fed back to the delay means 2 via the feedback level adjustment means 8, and the
feedback level of the feedback level adjustment means 8 is controlled by the controller 7. The
other parts are the same as those of the first embodiment, so the description will be omitted.
When the level of the feedback level adjusting means 8 is set to "0", it becomes completely the
same as the first embodiment.
[0009]
Examples of combinations of addition or subtraction of the first addition / subtraction means 1
and the second addition / subtraction means 5 are shown in FIGS. 3 to 6. When the combination
A in FIG. 3 adds the first addition / subtraction means 1 in the first embodiment and subtracts
the second addition / subtraction means 5 in the first embodiment, the combination B in FIG. 4
subtracts the first addition / subtraction means 1 in the first embodiment When the 2 addition /
subtraction means 5 is subtraction, the combination C of FIG. 5 adds the first addition /
subtraction means 1 in the first embodiment, and the combination D of FIG. 6 adds the second
addition / subtraction means 5 in the first embodiment. In the above, the first addition /
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subtraction means 1 is added and the second addition / subtraction means 5 is subtracted.
[0010]
Next, a specific example of the delay means 2 will be described. In the delay means E shown in
FIG. 7, the audio signal is referred to as a low pass filter (hereinafter referred to as LPF). 11) and
input to a BBD (Bucket Brigade Device) element 12 via the LPF 11. The output of the BBD
element 12 is output via the LPF. Here, since the delay time is determined by the number of
stages of the BBD element 12 and the clock frequency from the clock generation circuit 13 given
to the BBD element 12, the delay time is adjusted by controlling the clock generation circuit 13
by the controller 7. it can.
[0011]
Further, in the delay means F shown in FIG. 8, an audio signal is inputted to a CCD (Charge
Coupled Device) element 15 through the LPF 11, and the output of the CCD element 15 is
outputted through the LPF 14. Here, since the delay time is determined by the number of stages
of the CCD element 15 and the clock frequency from the clock generation circuit 13 given to the
CCD element 15, the delay time is adjusted by controlling the clock generation circuit 13 by the
controller 7. it can. When the S / N ratio is insufficient, a so-called compander circuit can be
added.
[0012]
Furthermore, the delay means G shown in FIG. 9 is a digital delay using a semiconductor
memory, and quantizes the audio signal by inputting the audio signal to the A / D converter 22
via the LPF 21 and performing A / D conversion, After being stored in the semiconductor
memory 23 for a predetermined time, it is converted back to an audio signal through the D / A
converter 25 and the LPF 26 and output. Here, the delay time is determined by the storage time
of the semiconductor memory 23, and this storage time is controlled by the controller 24. When
the input audio signal is quantized, the delay time can be controlled only by the semiconductor
memory 23 and the controller 24.
[0013]
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Table 1 shows an example of the combination of addition and subtraction in FIGS. 3 to 6 of the
first and second addition and subtraction means 1 and 5 according to the music genre and an
example of the level adjustment amount of the level adjustment means 3 in each of the above
embodiments. .
[0015]
For example, since many vocals are relatively strong in new music-related music, the vocals are
added as they are to the back performance only, with a sense of depth and a broad sense, and on
the contrary, the vocals are generally weak idols. In music, an echo effect is added to the vocals
localized at the center.
In classical music, the sound is added to the sound, which has been widely spread throughout.
Here, the configuration of the first and second addition / subtraction means 1 and 5 and the level
adjustment amount of the level adjustment means 3 are switched, but the delay time of the delay
means 2 and the feedback level adjustment amount of the feedback level adjustment means 8 By
switching also, sound field effects more suitable for genres can be obtained.
[0016]
As described above, according to the present invention, according to the genre of music selected
by the selection means, addition or subtraction of the first addition / subtraction means for
adding or subtracting audio signals of two channels, first addition / subtraction Since the delay
time of the delay means for delaying the audio signal from the means and the level of the level
adjustment means for adjusting the level of the audio signal from the delay means are controlled,
the sound field effect suitable for the genre is selectively added Can be realized with a relatively
simple configuration, the cost can be reduced due to the simple configuration, and the present
invention can be applied to low-cost portable and on-vehicle acoustic devices.
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