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JPH1042388

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DESCRIPTION JPH1042388
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound reproduction apparatus used for various sound equipment.
[0002]
2. Description of the Related Art In recent years, various improvements have been made to
improve the sound quality of a sound reproduction apparatus.
[0003]
As an example, a sound reproducing apparatus as shown in FIG. 3 has been developed.
That is, the signal input from the input terminal 1 passes through the subtractor 2 and is poweramplified by the power amplifier 3 and applied to the two speakers 4 and 5 to reproduce a sound
according to the input signal. In the vicinity of the individual speakers 4 and 5, microphones 6
and 7 for detecting the sound output from the speakers 4 and 5 are arranged, and the signals
detected by the microphones 6 and 7 are transmitted to the adder / subtractor 9 through the
microphone amplifier 8. A feedback circuit is formed by adding and processing the input signal
and the signal output from the subtracter 2 to form a feedback circuit to be input to the
subtractor 2, and the speakers 4, 5 are controlled by the feedback circuit. Sound was reproduced
to improve the sound quality.
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1
[0004]
However, although the above-described conventional sound reproducing apparatus can improve
the output characteristics for sound reproduction of the respective speakers 4 and 5, it is
possible that the respective speakers 4 and 5 are mutually separated. The difference in output
characteristics could not be corrected, and was not satisfactory.
[0005]
An object of the present invention is to provide a high-quality sound reproducing apparatus in
which the conventional defects as described above are eliminated and the difference between the
output characteristics of the speakers is corrected.
[0006]
SUMMARY OF THE INVENTION In order to solve the above problems, the sound reproducing
apparatus according to the present invention drives two or more speakers in parallel by driving
one output of a power amplifier, and drives each of the speakers. Correspondingly, one or more
microphones are installed, and a signal detected by this microphone is subjected to feedback
processing by one adder / subtracter through an adder, and sound reproduction is performed by
the speaker.
[0007]
With this configuration, the difference in the output characteristics with respect to the sound
reproduction of the respective speakers can be corrected to realize balanced sound reproduction.
[0008]
According to a first aspect of the present invention, there is provided an audio reproducing
apparatus in which an audio output from a speaker is detected by a microphone, and arithmetic
processing is performed on an input portion of an amplifier for feedback. Two or more parallel
connected speakers are driven by one output channel of the power amplifier, one or more
microphones are installed in each speaker, and a signal detected by this microphone is processed
to form one feedback circuit With this configuration, it is possible to mutually correct the
difference in the output characteristics for sound reproduction between two or more speakers to
realize balanced sound reproduction.
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[0009]
According to the second aspect of the present invention, the filter circuit is provided at the front
stage of each of two or more speakers, and noise-free sound reproduction can be realized.
[0010]
Hereinafter, embodiments of the present invention will be specifically described with reference to
the drawings.
(First Embodiment) FIG. 1 is a block diagram of a sound reproduction apparatus according to one
embodiment of the present invention, in which a signal inputted from an input terminal 10 is
power amplified by a power amplifier 12 through a subtractor 11. The output 1 channel poweramplified by the power amplifier 12 is applied to two speakers 13 and 14 connected in parallel,
and the two speakers 13 and 14 generate an acoustic output according to the applied signal.
The microphones 15 and 16 are respectively installed in the vicinity of the two speakers 13 and
14, the sound output of the two speakers 13 and 14 is detected, and the detection signals of the
microphones 15 and 16 are added by the adder 17. The output signal of the microphone
amplifier 18 and the output signal of the subtractor 11 are arithmetically processed by the adder
/ subtractor 19, and the output signal is input to the subtractor 11 to form a feedback circuit.
There is.
[0011]
The transfer function of this sound reproduction apparatus can be expressed as shown in
(Equation 1).
The same transfer function can be used for the speakers 13 and 14 as well.
[0012]
Further, the transfer functions of the speakers 4 and 5 of the conventional sound reproducing
apparatus shown in FIG. 3 can be expressed by (Equation 2) and (Equation 3).
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[0013]
When comparing the transfer function of the present invention with the transfer function of the
prior art, the output characteristics of the two speakers can be corrected more clearly than in the
conventional example, and can be made uniform and the feedback amount can be made. It can be
seen that it is possible to increase.
[0014]
When the number of speakers is n (n is a natural number of 3 or more), the transfer function in
the present invention is as shown in (Equation 4), and in the case of the prior art, the transfer
function of each speaker is (Equation 5) It can be seen that in the present invention, mutual
correction and equalization of output characteristics are possible.
[0015]
Furthermore, when the number of microphones is m (m is a natural number of 2 or more)
installed in each speaker, Tspm (S) in (Equation 4) is replaced with (Equation 6) in the present
invention. It is possible to mutually correct and equalize output characteristics.
[0016]
Embodiment 2 Hereinafter, a sound reproducing apparatus according to another embodiment of
the present invention will be described with reference to the drawings.
FIG. 2 is a block diagram showing another embodiment of the present invention.
Here, for the sake of simplicity, it is assumed that two speakers and one microphone are provided
for each speaker.
The signal input from the input terminal 20 passes through the subtractor 21, is power amplified
by the power amplifier 22, passes through the filters 23 and 24, and is applied to the speakers
25 and 26.
[0017]
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The signals output from the speakers 25 and 26 are detected by the respective microphones 27
and 28, subjected to addition processing by the adder 29, and then amplified by the microphone
amplifier 30.
The output signal of the microphone amplifier 30 and the output signal of the subtracter 21 are
arithmetically processed by the adder / subtractor 31, and the signal is input to the subtractor
21 to form a feedback circuit.
[0018]
Also in the circuit of this configuration, as in the first embodiment, mutual correction among the
speakers can be performed, and equalization can be achieved, and noise can be removed by the
filters 23 and 24 to realize acoustic reproduction without noise.
[0019]
As described above, by using the sound reproducing apparatus according to the present
invention, it becomes possible to mutually correct and equalize sound reproduction between the
respective speakers, and there is no difference in performance between the respective speakers
and the performance is improved. It is possible to realize well-balanced sound reproduction.
[0020]
Brief description of the drawings
[0021]
1 is a block diagram showing a sound reproduction apparatus according to an embodiment of
the present invention.
[0022]
2 is a block diagram showing a sound reproduction apparatus according to another embodiment
of the present invention.
[0023]
Fig. 3 A block diagram showing a conventional sound reproducing apparatus
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[0024]
Explanation of sign
[0025]
Reference Signs List 10, 20 input terminals 11, 21 subtractor 12, 22 power amplifier 13, 14, 25,
26 speaker 15, 16, 27, 28 microphone 17, 29 adder 18, 30 microphone amplifier 19, 31 addersubtractor 23, 24 filter
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