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JPH0539100

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DESCRIPTION JPH0539100
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
stereo sound reproducing apparatus such as a stereo sound apparatus and an audio multiplex
television, and more particularly to a stereo sound reproducing apparatus combining an audio
canceling circuit and a surround circuit.
[0002]
2. Description of the Related Art A conventional voice cancellation circuit is configured as shown
in FIG. 4 or 5, for example. The voice cancellation is to remove the voice band of the (L + R)
component of the input signal, noting that the vocals and announcements are monaural
components (center localization) of the stereo signal.
[0003]
4, the (L + R) component is extracted by the (L + R) detection circuit 3 from the L signal input
from the terminal 1 and the R signal input from the terminal 2, and the (L + R) signal is extracted
by the band pass filter 16. Only the voice band of the above is passed and put into the subtractor
13 to remove monaural voice components from the original L signal and R signal and output
them to the output terminals 8 and 9.
[0004]
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1
Further, in FIG. 5, the L signal from the terminal 1 and the R signal from the terminal 2 are
respectively passed through the band elimination filter 5 to remove all the voice band, and the
spread component is the (LR) detection circuit. 4, and the adder 12 and the subtracter 13 convert
them back to L and R signals to realize voice cancellation.
As shown in FIG. 6, the band elimination filter 5 in this case is configured by combining a high
pass filter HPF and a low pass filter LPF in parallel.
[0005]
On the other hand, conventionally, a surround circuit as shown in FIG. 7 has been used as means
for reproducing the stereo broadcast of a game such as baseball or soccer with a sense of
presence as it is on the spot. In this circuit, the (L−R) or (L + R) component is extracted from the
input L and R signals by the detector 17, and added to the original L and R signals through the
surround processing circuit 11 consisting of a phase shifter or delay circuit. The signals are
output to the terminals 14 and 15 by being added by the subtracter 13.
[0006]
By the way, in the voice cancel circuit shown in FIG. 4, when phase rotation occurs in the output
of the band pass filter 16, the voice can not be completely eliminated even by subtraction. In
particular, there is a problem that the phase can be easily rotated if the quickness of the band
pass is determined, so that the voice removal rate becomes low.
[0007]
Further, in the voice cancellation circuit shown in FIG. 5, the band elimination filter 5 is
separately used on the L side and the R side. Since the filter 5 is a combination of the high pass
filter HPF and the low pass filter LPF in parallel as shown in FIG. 6, there is a problem that cost
increase is caused by providing two systems.
08-05-2019
2
[0008]
Also, in the conventional surround circuit, although the sense of realism is increased, if the voice
of the announcer or the commentator is large, there is a problem that this becomes rather
annoying.
[0009]
In view of such circumstances, the present invention aims at providing a stereo sound
reproducing apparatus capable of enhancing presence while removing voices of announcers and
commentators during broadcasting such as sports broadcasting. I assume.
[0010]
A stereo sound reproducing apparatus according to the present invention comprises a (L + R)
detection circuit for extracting a sum signal of left and right input signals, an (LR) detection
circuit for extracting a difference signal, and the above ((6) L + R) A band removal filter circuit for
removing voice band components from the signal taken out of the detection circuit, and an
addition circuit for adding the output of this band removal filter circuit and the output of the (LR)
detection circuit and outputting as a left signal And an audio cancellation circuit consisting of a
subtraction circuit which subtracts the output of the (LR) detection circuit from the output of the
band elimination filter circuit and outputs the result as a right signal, and the output of the audio
cancellation circuit R) A surround circuit which takes out the component, performs surround
processing, and adds it to the output of the above-mentioned audio cancellation circuit.
[0011]
[Operation] In the device of the present invention, the voice canceling circuit removes the
offending announcement voice, and the spreading component is processed by the surround
circuit to give a sense of realism.
[0012]
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing the configuration of an audio cancellation circuit 100 in the
stereo audio reproduction apparatus of the embodiment.
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3
In this figure, the band elimination filter 5 is for eliminating the band 100 Hz to 5 KHz of human
voice.
In this circuit 100, the input signal from the terminal 1 and the input signal from the terminal 2
become (L + R) signal and (L-R) signal by the (L + R) detection circuit 3 and the (L-R) detection
circuit 4.
The (L + R) signal is passed through the band elimination filter 5, and the (L + R) signal passed
through the band elimination filter 5 and the (LR) signal output from the (LR) detection circuit 4
are added to the adder circuit 6. Are respectively added and subtracted by the subtraction circuit
7 and output to the L output terminal 8 and the R output terminal 9.
[0013]
If the band elimination filter 5 is not provided, the L side output becomes (L + R) + (L-R) = 2 L by
the adding circuit 6 and the R side output becomes (L + R)-( L−R) = 2 R. That is, it can be seen
that the input / output relationship is normal. Therefore, voice cancellation can be easily
performed by passing the (L + R) signal in this case through the band elimination filter 5. This
voice cancellation circuit has a high voice rejection rate because it does not use a band pass filter
as in the prior art. In addition, since only one band elimination filter 5 is used, it is advantageous
in cost.
[0014]
FIG. 2 is a diagram showing an entire configuration of the stereo sound reproducing apparatus
300 of the embodiment. The stereo sound reproduction apparatus 300 is such that the input end
of the surround circuit 200 is connected to the terminals 8 and 9 of the sound cancellation
circuit 100. In the surround circuit 200, the spread component is extracted by the (LR) detection
circuit 10 from the signal output from the sound cancellation circuit 100, and the spread
component is subjected to surround processing by the surround processing circuit 11. Then, the
signal subjected to the surround processing is added to the original signal by the adder 12 and
the subtracter 13 and finally output to the L output terminal 14 and the R output terminal 15.
[0015]
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4
According to the stereo sound reproducing apparatus 300, since the surround processing is
performed in a state where the voice of the announcer and the commentator is removed, the user
can enjoy the sense of presence as if being at the game place without being disturbed by the
extra voice. Can.
[0016]
Although the (L-R) detection circuit 10 in the salland circuit 200 is provided separately from that
in the voice cancellation circuit 100 in the above embodiment, the (L-R) detection circuit in the
voice cancellation circuit 100 is It is also possible to share 4 with both.
FIG. 3 is a modified example configured as such. The same effect is obtained in this example.
[0017]
[Effects of the Invention] As described above, according to the present invention, by removing the
voice of the announcer and commentator of the sports program of the stereo broadcast relay and
expanding the spreading component, it is possible to the game ground in the screen. You can feel
the realism you have.
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