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DESCRIPTION JPH0850493

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DESCRIPTION JPH0850493
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio signal reproduction apparatus provided with a pitch control circuit of an audio device used
for karaoke or recording.
[0002]
2. Description of the Related Art FIG. 1 shows an audio signal reproduction apparatus having a
conventional pitch control circuit. Hereinafter, an audio signal transmitted through the
microphone will be referred to as a microphone audio signal. A microphone sound signal input
through the microphone is input from the input terminal 5 to the pitch control circuit 1 through
the amplifier 6. Then, variable processing can be performed in accordance with the control signal
for changing the pitch from the pitch setting terminal 11, and the microphone voice signal
subjected to voice change can be output from the output terminal 16.
[0003]
2 and 3 schematically illustrate an example of the pitch control circuit 1. Memory for ringing
address space as shown in Figure 2 for pitch control. That is, a ring buffer is used. FIG. 3A is a
waveform diagram showing processing when raising the pitch, and FIG. 3B is a waveform
diagram showing processing when lowering the pitch. The ring buffer write point is constantly
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moving at the sampling frequency fs. Here, the frequency of the input microphone audio signal is
changed by changing the reading speed v1 with respect to the writing speed v0 to the ring
buffer. This makes it possible to change the pitch. Here, if the speed ratio p = read speed v1 /
write speed v0, the pitch does not change when the speed ratio p is 1. When the speed ratio p is
2, the frequency ratio is doubled, and the pitch is raised by one octave. When the speed ratio p is
0.5, the frequency ratio is 1/2 and the pitch is lowered by one octave.
[0004]
However, if the reading speed is changed, the speed of music changes and the playing time
changes. Therefore, when raising the pitch as shown in FIG. 3A, the reading speed is increased
and the time is adjusted by repeatedly reproducing a part of the data. When the pitch is lowered
as shown in FIG. 3B, the reading speed is decreased and part of the data is thinned out. As a
result, it is possible to change the pitch and sing as one of the functions of the karaoke audio
apparatus, and to use it for presentation at the time of the presidency.
[0005]
However, with the function of the pitch control circuit provided in the conventional audio device,
only the voice signal of the microphone sound signal is changed, and the original sound can not
be heard. The In addition, since it is difficult to actually sing karaoke using this function, the use
and application range of narrative only at the time of presidency etc. were limited.
[0006]
Therefore, an object of the present invention is to mix an input microphone audio signal of an
original sound and a voice-changed microphone audio signal so that it can be used not only for
narration at the presidency etc. but also for karaoke and recording. SUMMARY OF THE
INVENTION An object of the present invention is to provide an audio signal reproduction
apparatus having a pitch control circuit.
[0007]
SUMMARY OF THE INVENTION The present invention relates to an audio signal reproduction
apparatus having a pitch control circuit capable of changing the pitch of an input microphone
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audio signal, comprising an input microphone audio signal and an output of the pitch control
circuit. An audio signal reproduction apparatus comprising: mixing means for mixing with the
microphone audio signal.
In addition, it has selection means for switching and outputting the microphone audio signal
output from the pitch control circuit and the microphone audio signal output from the mixing
means, and further, the input microphone audio signal is transmitted via the variable delay
circuit. It is an audio signal reproduction device that can be supplied to the mixing means.
[0008]
Operation A dummy harmonic effect such as a duet can be obtained by mixing and outputting
the input microphone audio signal and the voice change microphone audio signal. In addition, a
chorus effect can also be obtained by utilizing the difference in processing time of the pitch
control circuit with respect to the input microphone audio signal.
[0009]
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 4 is a block diagram of an embodiment of the present invention. Then, an audio signal
transmitted through the microphone is hereinafter referred to as a microphone audio signal.
First, the configuration will be described. The input terminal of the pitch control circuit 1 is
connected to the output terminal of the amplifier 6. Further, a control signal for changing the
pitch from the pitch setting terminal 11 is input to the pitch control circuit 1. The output
terminal of the pitch control circuit 1 is connected to the output terminal 16 via the terminal a-c
of the switch 15 and to the input terminal of the amplifier 14 via the switch 12 and the mixing
variable resistor 3.
[0010]
The output terminal of the amplifier 6 is connected to the input terminal of the buffer amplifier 8
via the attenuator 7. The output terminal of the buffer amplifier 8 is connected to the input
terminal of the variable delay circuit 2. The variable delay circuit 2 delays the input microphone
audio signal in accordance with the control signal from the delay setting terminal 9. The variable
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delay circuit 2 corrects the processing time of the pitch control circuit 1. The output terminal of
the variable delay circuit 2 is connected to the input terminal of the amplifier 14 via the resistor
10. The output terminal of the amplifier 14 is connected to the output terminal 16 via the
terminal b-c of the switch 15.
[0011]
The pitch control circuit 1 changes the pitch of the input microphone audio signal in accordance
with the control signal from the pitch setting terminal 11. Then, by the mixing variable resistor 3
and the resistor 10, the microphone audio signal and the voice change microphone audio signal
can be mixed at a predetermined ratio. In addition, the chorus effect can be obtained by utilizing
the difference in processing time of the pitch control circuit with respect to the input microphone
audio signal. Furthermore, by changing the time difference of the input microphone audio signal
with respect to the voice change microphone audio signal by the control signal from the delay
setting terminal 9 of the variable delay circuit 2, it is possible to produce a chorus effect or
change its degree. . In addition, fixation of the time difference of the input microphone audio |
voice signal with respect to a voice change microphone audio | voice signal is also possible.
[0012]
In the embodiment of the present invention described above, the connection state of the switch
12 is controlled by the control signal 4a from the selection setting terminal 13a. Further, the
connection state of the switch 15 is controlled by the control signal 4 b from the selection setting
terminal 13 b. When the switch 12 is turned off and the terminal b of the switch 15 is connected
to the terminal c, an input microphone audio signal is output. When the terminal a of the switch
15 is connected to the terminal c regardless of whether the switch 12 is on or off, a voice change
microphone audio signal is output. When the switch 12 is turned on and the terminal b of the
switch 15 is connected to the terminal c, the mixed microphone audio signal of the input
microphone audio signal and the voice change microphone audio signal is output. That is,
according to one embodiment of the present invention, the input microphone audio signal, the
voice change microphone audio signal, and the mixture of the input microphone audio signal and
the voice change microphone audio signal can be selected.
[0013]
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Here, a DSP (Digital Signal Processor) is used for the pitch control circuit 1. The DSP is a
microcomputer dedicated to process signals in real time to represent a signal to be handled as a
digital quantity and to add mathematical operation to it to extract a target signal. Then, the DSP
performs the signal processing algorithm by software. When this DSP is used, not only echo
effects can be obtained for harmonics and chorus effects, but also echo effects can be varied.
Also, the echo effect can be fixed. Furthermore, by setting only the time difference of the input
microphone audio signal to the microphone audio signal voice-changed by the DSP, the chorus
effect after mixing can be varied more greatly. The same effect can also be obtained by providing
a variable delay circuit at the output terminal of the pitch control circuit 1.
[0014]
According to the present invention, a dummy harmonic effect such as a duet can be obtained by
mixing and outputting an input microphone audio signal and a voice change microphone audio
signal. In addition, a chorus effect can also be obtained by utilizing the difference in processing
time of the pitch control circuit with respect to the input microphone audio signal. Furthermore,
echo effects can also be obtained by using a DSP. This broadens the scope of application.
[0015]
Brief description of the drawings
[0016]
1 is an explanatory diagram of an example of a conventional pitch control circuit.
[0017]
2 is a schematic diagram for explaining a ring buffer for pitch control.
[0018]
3 is a waveform diagram for explaining an example of the pitch control process.
[0019]
4 is a block diagram of an embodiment of the present invention.
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[0020]
Explanation of sign
[0021]
1 pitch control circuit 2 variable delay circuit 3 variable resistor for mixing 7 attenuator 12, 15
changeover switch
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