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JPS5674594

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPS5674594
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an example of a
conventional acoustic device, and FIG. 2 is a block diagram showing an embodiment of the
acoustic device of the present invention. 1 is a left channel signal input terminal, 3 is a delay
circuit, 5 is a high band matrix circuit, 6 is a right channel signal input terminal, 7 is a switching
circuit, 8 and 10 are changeover switches, 9 is a left channel signal output terminal, 11 Is a right
channel signal output terminal, 12 is a switching control circuit, and 13 is a gain control circuit.
DETAILED DESCRIPTION OF THE INVENTION The present invention is a sound 1 device which
can be switched depending on preference between the case of reproducing an audio signal and
the processing of a certain signal on the audio signal to improve the sense of reality. In
particular, the present invention is designed to be able to prevent the reduction in volume of
sound when signal processing is performed. Conventionally, (1) 7f 4)-a method of improving
presence by some kind of signal processing is performed, not limited to monaural broadcast and
stereo broadcast. As an acoustic device for performing this signal processing, one as shown in
FIG. 1 has been proposed. That is, in FIG. 1, il + indicates an input terminal to which the left
channel signal obtained by the stereophonic circuit is supplied, and the left channel signal
supplied to the input terminal (1) is pre-emphasis having high-frequency emphasis
characteristics. The delay circuit (3) is supplied to the input terminal of the delay circuit (3)
through the circuit (2), and the left channel signal is delayed for a predetermined time, and the
output terminal of the delay circuit (3) The characteristic is such that the signal delayed for a
predetermined time to be output is restored to a flat characteristic according to the highfrequency emphasis characteristic of the pre-emphasis circuit (2) and the further-area reduction
characteristic of the delay circuit (3) The de-emphasis circuit (4) supplies one of the input
terminals of the area matrix circuit (5) that outputs a channel signal that has been processed so
as to improve the sense of reality. In this case, the delay circuit (the left channel signal (2) in the
delay circuit (3) is obtained by providing the pre-emphasis circuit (2) and the te-emphasis circuit
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(4) in the input terminal and the output terminal of 31 respectively). When delay processing is
performed, noise is prevented from being mixed into the left channel signal to reduce the 8N
ratio in the high band. (6) shows an input terminal to which the right channel signal obtained
from the stereo demodulation circuit is supplied, and the right channel signal supplied to the
input terminal (6) is input to the other input terminal of the high band matrix circuit (5) Cosupplement. In this case, the high frequency band I) circuit (5) is a high frequency band of the
left channel signal and the right channel signal delayed for a predetermined time supplied to one
of the high frequency band matrix circuit (5) and the local input terminal. Interfere with each
other, and the right channel signal and the right channel signal which are signal-processed to
improve the sense of reality are output from one and the other output terminals of the high-pass
matrix circuit (5). It is done. Further, the left channel signal input terminal (1) is connected to one
fixed contact (8a) of the changeover switch (8) constituting the changeover circuit (7), and the
left channel signal of the high band matrix circuit (5) is obtained Of the output terminal of the
switch (8) to the other fixed contact (8b) of the changeover switch (8), and the left channel signal
output terminal (9) from the movable contact (8C) of the switch (i) The right channel signal input
terminal (6) is connected to one of the fixed contacts (10a) of the changeover switch (7)
constituting the switching circuit (7), and the right channel signal of the high band matrix circuit
(5) is obtained. The other output terminal to be connected is connected to the other fixed contact
(1ob) of this changeover switch (101), and the right channel signal output terminal (11) is
derived from the movable contact (IOC) of this changeover switch 001
Further, (12+ represents a switch control circuit, and a control signal is supplied from the switch
control circuit 021 to the switch circuit (7). In this case, the changeover switches (8) and (ITo
which constitute the changeover circuit (7) are controlled to operate in conjunction with a
control signal supplied from the changeover control circuit 02J. That is, when the normal left
channel signal and the right channel signal are obtained without signal processing to improve the
sense of reality, the control signal is supplied from the switching control circuit (121) to the
switching (7) path. And the movable contact (8C) of the changeover switch (8) is connected to the
fixed contact (8m), and the movable contact (10c) of the changeover switch に is connected to
the fixed contact (10 &). The left channel signal supplied to the left channel (4) 2 □] / <5 signal
input terminal (1) is obtained as it is from the output terminal (9), the right channel signal output
terminal 0υ second is the right channel The right channel signal supplied to the signal input
terminal (6) is obtained -1. When the left channel signal and the right channel signal subjected to
signal processing to improve the sense of reality are obtained, a control signal is supplied from
the switching control circuit (12+) to the switching circuit (7). The movable contact (8C) is
connected to the fixed contact (8b) and the movable contact (10t) of the changeover switch 00) is
connected to the fixed contact (10b), so it is higher than the left channel signal output terminal
(9) A left channel signal processed to improve the sense of presence obtained from one output
terminal of the range matrix circuit (5) is obtained, and the other of the high range matrix circuit
(5) is obtained from the right channel signal output terminal αυ. A right channel signal that has
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been signal-processed to improve the realism obtained from the output terminal is obtained. As
described above, since the acoustic device shown in FIG. 1 is configured, the switching control
circuit Q2 + supplies the control signal (5) to the switching circuit (7) when reproducing normal
sound. And connect the movable contact (8C) of the changeover switch (8) to the solid jZm point
(8a) and connect the movable contact (IOC) of the changeover switch CLOI to the fixed contact
(1Oa). The left channel signal supplied to the left channel signal input terminal (1) is obtained as
it is from the channel signal output terminal (9) and is supplied to the right channel signal input
terminal (6) to the right channel signal output terminal α1) Since the right channel signal can be
obtained as it is, normal sound can be reproduced. On the other hand, in the case of reproducing
a voice whose realism is improved more than usual, the control signal is supplied to the
switching control circuit (one-turn switching circuit (7), and the movable contact (8C To connect
the movable contact (IOC) of the changeover switch QOi to the fixed contact (10b), while the left
channel signal output terminal (9) The left channel signal processed so as to improve the sense
of reality obtained at one output terminal of 51 is obtained, and the right channel signal output
terminal U に is obtained at the other output terminal of the high band matrix circuit (5) Since
the right channel signal (6) signal-processed to improve the sense of reality can be obtained, it is
possible to reproduce the voice with the sense of reality improved from the passing.
As described above, according to such an audio device as shown in FIG. 1, by controlling the
switching circuit (7), it is possible to switch and reproduce a normal sound and a sound with
improved sense of reality than usual. . However, according to such an audio device as shown in
FIG. 1, the switching circuit (7) is controlled by the control signal output from the switching
control circuit t12, and the signal processing system is not used to improve the sense of reality.
When the sound processing is changed to a state in which the signal processing is performed to
improve the sense of reality and the sound in which the sense of reality is improved than usual is
reproduced, the sense of presence actually improves, but the sense of hearing Above, the sense
of sound decreases (the phase of the signal changes with the delay circuit (3), the phase is
different from the signal of the other channels, and even if they interfere with each other, the
numbers cancel each other and the volume decreases It seems to be. ), There was a disadvantage
that brought about a forceful decline. In view of such a point, the present invention switches and
connects signal processing so as to increase the sense of realism ... (7) N, even in the sense of
hearing. It does not reduce the volume of the stuttering, and it is nine things not to cause a force
reduction. Hereinafter, an embodiment of the sound cultivating apparatus of the present
invention will be described with reference to FIG. In FIG. 2, parts corresponding to FIG. 1 are
given the same reference numerals, and the detailed description thereof is omitted. That is, one
input terminal (11 of the gain control circuit 03) to which the left channel signal is supplied is
connected to one input terminal of the gain control circuit α3 and one output terminal from
which the left channel signal of the gain control circuit α3 is obtained is a pre-emphasis circuit
(2 ) Connect to the fixed input (8a) of the changeover switch (8) as well as to the input terminal.
Further, the input electrons (6) to which the right channel signal is supplied are connected to the
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other input terminal of the gain control circuit α3, and this one control circuit (the other output
terminal corresponding to the right channel signal of 13 is obtained. The input terminal is
connected to the other input terminal of the bulk region 1) circuit (5) to which the delayed left
channel signal is supplied from the output terminal of the de-emphasis circuit (4), and the
changeover switch (101 Kk to the fixed contact (tOa). Also, control (8) j, / 1? Control No. 16 is
supplied to the signal supply terminal. In this case, the gain node “old circuit I” is the same as
the left channel signal and right channel @ supplied to one and the other input terminals of the
control circuit u3. When the signal is output from one or the other output terminal, and amplified
at a predetermined level (for example, 20% to 40% to compensate for the volume of the sound
that drops when signal processing is performed to improve the presence), The gain control
circuit 0 is configured to be able to be switched in two stages of the case of outputting to one and
the other output terminals of the gain control circuit 0.
Moreover, this switching control is performed in conjunction with the switching of the switching
circuit (7). That is, while the switching circuit (force is connected to the fixed contact (8a) of the
movable contact (8C) of the changeover switch (8), the movable contact (10c) of the changeover
switch 0 is connected to the fixed contact (10a) When the gain control circuit 0... Is switched
from the one and the other output terminals of the gain control circuit 0. The left channel signal
and the right channel signal respectively supplied to the one and the other input terminals of the
switch are switched as they are to be output as they are, and the switch (9)) circuit (7) ) Is
switched so that the movable contact (8C) of) is connected to the fixed contact (8b) and the
movable contact (10c) of the changeover switch .alpha.Q is connected to the fixed contact (10b).
The gain control circuit (the left channel signal and the right channel signal respectively supplied
to the one and the other input terminals of the gain control circuit 03+ from the one and the
other output terminals of the gain control circuit 03+ are amplified by predetermined levels
respectively) Switch to output channel signal. Others are configured as in FIG. As described
above, since the embodiment shown in FIG. 2 is configured, the control signal is supplied from
the switching control circuit a2 to the switching circuit (7) to reproduce normal sound. If the
movable contact (8C) of the changeover switch (8) is connected to the fixed contact (8a) and the
movable contact (10e) of the changeover switch αα is connected to the fixed contact (lOa), the
control circuit The switching control circuit u force and control information are simultaneously
supplied also to the control signal supply terminal 131, and the gain control 1 ii 11 j l + 14 one
and the other inputs from the one and the other output terminals of the gain control circuit 0'5.
The left channel signal and the right channel signal respectively supplied to the terminal are
output as they are. Therefore, the left channel signal supplied to the left channel signal output
terminal (1) is obtained as it is to the left channel signal output terminal (9), and supplied to the
right channel signal input terminal (6) to the right channel signal input terminal +113. Since the
right channel signal to be output is obtained as it is, normal sound can be reproduced. On the
other hand, in the case of reproducing the voice whose reality is more improved than usual, the
switching control circuit 鰺 controls the switching circuit (7) 4! Supply No. T to connect the
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movable contact (8C) of the changeover switch (8) to the fixed 4 points (8b) and connect the
movable contact (10e) of the changeover switch flUi to the fixed contact (10b) In other words,
the control signal of the gain control circuit 0 is simultaneously supplied with the control signal
from the switching control circuit a, and from one and the other output terminals of the gain
control circuit a, the gain control circuit 0 is Since the left channel signal and the right channel
signal respectively supplied to one and the other input terminals are respectively amplified by a
predetermined level and output, to the high-pass matrix circuit aυ'l?
· The left channel signal amplified by the predetermined level is subjected to delay processing at
one output terminal to which the left channel signal of f (5) is output, and the presence feeling is
further improved by the high band matrix circuit (5) It is possible to obtain a left channel signal
that has been signal-processed so that the right channel signal amplified by a predetermined
level is output to the other output terminal from which the right channel signal of the high band
matrix circuit (5) is output. A right channel signal processed so as to improve the sense of
presence in the high-pass matrix circuit (5) can be obtained. Therefore, the left channel signal
output terminal (9) obtains a left channel signal which is amplified by a predetermined level and
processed to improve the sense of presence, and is also amplified by a predetermined level at the
right channel signal output terminal Uυ. Since the right channel signal processed so as to
improve the sense of reality can be obtained, it is possible to reproduce the voice with the sense
of presence improved more than usual without reducing the sense of volume of the sound.
According to the present invention thus conceived, the signal processing for improving the sense
of reality is performed, and at the same time, the level of the audio signal subjected to the pick
processing is amplified by a predetermined level. As shown in FIG. 1, when switching from
normal sound reproduction to sound reproduction with improved sense of realism, the sense of
loudness of the sound decreases, resulting in a reduction in force. There is no such
inconvenience. In the embodiment shown in FIG. 2, the delay circuit (3) is used to improve the
sense of reality, but a phase shift circuit is used instead of the delay circuit (3). The same applies
to books configured to improve the sense of reality by using them. In the case of the embodiment
shown in FIG. 2, although the case of stereo broadcasting has been described, in monaural
broadcasting, signal processing is performed to improve the sense of reality by using a delay
circuit (3) or a phase shift circuit. In the same way, the same operation and effect can be obtained
by amplifying the sound signal subjected to the signal processing by a predetermined level at the
same time as performing the signal processing to improve the sense of reality. Further, the
present invention is not limited to the above-described embodiment, and it goes without saying
that the configuration of one stock can be taken without departing from the gist and the third
aspect of the present invention.
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