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DESCRIPTION JP2010072270

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DESCRIPTION JP2010072270
The present invention provides an audio amplifier capable of automatically switching audio
signal processing such as echo to microphone audio in accordance with the input of another
audio source. A karaoke player 4, a DVD player 5, and a BGM player 6 are connected to audio
source input terminals 34, 35, 36, respectively. Further, audio signals of the microphones 2 and
3 are input to the echo generator 12. The microcomputer 10 detects whether the karaoke
performance sound is input or not based on the voltage detected at the AD port 10A. When it is
detected that the karaoke performance sound is input, the audio source input terminal 34
(Karaoke) is selected by the input switch 15, and the echo generator 12 is turned on to add an
echo to the microphone input. [Selected figure] Figure 1
オーディオアンプ
[0001]
The present invention relates to an audio amplifier that automatically selects one of a plurality of
input audio sources.
[0002]
Audio amplifiers installed in banquet halls and the like include input terminals of a plurality of
audio sources, and audio sources input from each input terminal are appropriately switched and
used according to a scene.
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1
For example, in a greeting or speech scene, a quiet BGM is played, and in an entertainment scene,
a switching such as a karaoke song is performed.
[0003]
Since it is troublesome for the clerk to manually perform this switching, an audio amplifier
having a function to automatically switch the selection of the audio source from BGM to karaoke
is put into practical use when karaoke tones are input from the karaoke apparatus. There is.
[0004]
JP 2007-148155 A
[0005]
At parties such as wedding receptions, guests often greet before singing karaoke songs.
In this case, the same microphone is typically used to sing greetings and karaoke songs.
For the input signal of the microphone, it is necessary to turn off the echo in the setting for
speech during greetings, while it is necessary to turn on the echo in the setting for vocals when
singing karaoke.
[0006]
In the past, in anticipation of the end of the greeting, a clerk had an operation of starting the
karaoke song and turning on the microphone echo. As a result, the staff at the start of the
karaoke song has a lot of work, and sometimes the staff has forgotten to turn on the echo.
[0007]
An object of the present invention is to provide an audio amplifier capable of automatically
switching audio signal processing such as echo to microphone audio in accordance with the
input of another audio source.
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2
[0008]
The invention of claim 1 comprises a plurality of audio source input terminals, a microphone
sound input terminal, an audio signal processing unit for performing predetermined signal
processing on audio signals input from the microphone audio input terminal, and a plurality of
the plurality of audio signal processing units. A control unit for detecting whether or not a signal
is input from a specific audio source input terminal of the audio source input terminals, and
controlling to change the function of the audio signal processing unit when the input is detected;
It is characterized by
[0009]
The invention according to claim 2 is the invention according to claim 1, wherein the audio
signal processing unit includes an echo generation unit, and the control unit generates the echo
when detecting a signal input from the specific audio source input terminal. It is characterized by
turning on the function of the department.
[0010]
The audio signal processing unit may include an equalizer, and the specific audio source input
terminal may be an input terminal to which a karaoke player is connected, and the control unit.
When the signal input from the specific audio source input terminal is detected, the setting of the
equalizer is changed for vocal use, and when the signal input from the specific audio source input
terminal is not detected, the setting of the equalizer is speech It is characterized in that the
setting is changed.
[0011]
According to the present invention, when a signal is input from a specific audio source input
terminal, the audio signal processing is automatically switched, so that, for example, a staff
member turns on the echo of the microphone input at the start of the karaoke performance
(Karaoke performance end) Sometimes the task of turning off the microphone input is not
necessary, and it is possible to save the staff time.
[0012]
FIG. 1 is a block diagram of a karaoke amplifier according to an embodiment of the present
invention.
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3
The karaoke amplifier 1 includes microphone input terminals 32 and 22 and audio source input
terminals 34, 35 and 36.
The microphones 2 and 3 are connected to the microphone input terminals 32 and 33,
respectively.
The microphone input terminals 32, 33 are connected to the echo generator 12 via the A / D
converter 11.
The echo generation unit 12 is a functional unit that applies an echo effect to the audio signal of
the microphone input from the microphone input terminals 32 and 33.
The echo generator 12 is turned on / off by the control of the microcomputer 10 for its echo
application function. The voice signal of the microphone output from the echo generator 12 is
input to the equalizer 13. The equalizer 13 adjusts the sound quality of the microphone audio
signal. The audio signal output from the equalizer 13 is input to the mixer 14.
[0013]
On the other hand, the karaoke reproduction device 4, the DVD reproduction device 5 and the
BGM reproduction device 6 are connected to the audio source input terminals 34, 35 and 36,
respectively. Each audio source input terminal 34, 35, 36 is connected to the input selector 15.
The input switch 15 is a functional unit that selects one of the three audio source inputs under
the control of the microcomputer 10. The audio signal of one audio source selected by the input
switch 15 is converted into a digital audio signal by the A / D converter 16 and then input to the
key control circuit 17. The key control circuit 17 is a functional unit that changes the key (tone)
of the audio source, that is, the frequency, and is a functional unit that is used exclusively when a
karaoke performance sound is input. The microcomputer 10 controls whether or not to convert
the key of the audio source, and how much to convert. The audio signal of the audio source
output from the key control circuit 17 is input to the equalizer 18. The equalizer 18 adjusts the
sound quality of the audio source audio signal. The audio signal output from the equalizer 18 is
input to the mixer 14.
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4
[0014]
The mixer 14 mixes the audio signal of the microphone input from the equalizer 13 and the
audio signal of the audio source input from the equalizer 18 with an appropriate balance, and
outputs the mixed signal as one audio signal. When the audio source is a stereo signal, the mixer
14 mixes the microphone sound with this stereo signal.
[0015]
The audio signal output from the mixer 14 is input to the analog amplification circuit 20 via the
D / A converter 19. The analog amplification circuit 20 amplifies the input analog audio signal
and outputs the amplified signal to the speaker 7 through the output terminal 37.
[0016]
Further, the microcomputer 10 has two AD ports 10A and 10B. The AD port is a port that
receives an analog voltage value, A / D converts the voltage value, and takes it into the
microcomputer 10.
[0017]
An audio source input terminal 34 is connected to the AD port 10A via an integrating circuit. The
integration circuit is composed of a diode 21 and a capacitor 22. The diode 21 is an element that
rectifies the positive half wave of the audio signal input from the audio source input terminal 34.
The capacitor 22 is formed of a large-capacity chemical capacitor, and stores the positive halfwave voltage rectified by the diode 21. With this configuration, the voltage across the terminals
of the capacitor 22 can be regarded as the average level of the audio signal input to the audio
source input terminal 34. When the detected voltage of the AD port 10A exceeds a
predetermined threshold value, the microcomputer 10 determines that the audio source input
terminal 34, that is, the signal input of the karaoke reproducing apparatus 4 is present.
[0018]
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5
An audio source input terminal 35 is connected to the AD port 10B via an integrating circuit. The
configuration of the integration circuit is the same as that connected to the AD port 10A. When
the detection voltage of the AD port 10B exceeds a predetermined threshold value, the
microcomputer 10 determines that the audio source input terminal 35, that is, the signal input of
the DVD reproduction device 5 is present.
[0019]
The microcomputer 10 switches the audio source by controlling the input switch 15 in the
priority order of karaoke> DVD> BGM. That is, when a signal is input from the karaoke
reproduction device 4, the karaoke reproduction device 4 (audio source input terminal 34) is
selected regardless of whether the signal is input from the DVD reproduction device 5. When no
signal is input from the karaoke reproduction device 4, if the DVD reproduction device 5 is input,
the DVD reproduction device 5 (audio source input terminal 35) is selected. When neither is
input, the BGM reproduction device 6 (audio source input terminal 36) is selected. The BGM
reproduction device 6 is a device such as an FM tuner or a wired broadcast receiver, for example,
in which a reproduction signal is constantly output. On the other hand, the karaoke reproduction
device 4 and the DVD reproduction device 5 are devices which appropriately output
reproduction signals by operation.
[0020]
Furthermore, the microcomputer 10 functions as the echo generator 12 when a signal is input
from the karaoke reproduction device 4, that is, when the input switching device 15 is switched
to the karaoke reproduction device 4 (audio source input terminal 34). Turn on. When the other
audio source input terminal is selected, the function of the echo generator 12 is turned off. When
the function of the echo generator 12 is off, the input audio signal is output as it is. Thereby, the
echo generator 12 functions only when an audio signal is input from the karaoke reproduction
device 4, that is, when a karaoke song is being played, and an echo is added to the audio signal
input from the microphones 2 and 3. It makes it possible to listen to the song well, and to output
a high-clarity voice without adding an echo to the microphone input in other situations.
[0021]
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6
Also, the settings of the equalizers 13 and 18 may be switched according to the selection of the
audio source. That is, the microphone equalizer 13 is set for speech when BGM or DVD is
selected, and is set for vocal when karaoke is selected. The setting of the audio source equalizer
18 is also changed appropriately in accordance with the selection of karaoke / DVD / BGM.
[0022]
Further, the key control amount of the key control circuit 17 is switched according to the
operation of the attendant by the user interface 31.
[0023]
For example, if a karaoke amplifier with the above configuration is installed at a wedding hall, for
example, if guests sing a karaoke song with the same microphone after the guest greets them at a
reception, the setting for echo-off speech is made when the guest greets When the voice signal of
the microphone is output and the greeting is finished and the clerk starts the karaoke song, the
karaoke amplifier automatically switches the audio source to the karaoke playback sound, and
the voice signal of the microphone is output in the setting for echo on vocal Be done.
[0024]
In this way, the clerk only starts the karaoke song at the timing of the end of the greetings of the
guest, and switching of the input of the audio source and echoing on of the microphone sound
are performed automatically, which saves the trouble of the clerk. , You can eliminate the
operation error.
[0025]
Although the above embodiment has described the configuration in which echo on / off and the
setting of the equalizer are automatically switched according to the input of the audio source, the
items to be automatically switched are not limited to this.
For example, decrease the volume on the audio source side when BGM is selected, turn off the
function of the key control circuit 17 when an audio source other than karaoke is selected,
increase the microphone gain and select dynamic range when karaoke is selected. You may make
it operate | move, such as enlarging.
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[0026]
Block diagram of the karaoke amplifier which is the embodiment of this invention
Explanation of sign
[0027]
DESCRIPTION OF SYMBOLS 1 ... Karaoke amplifier 2, 3 ... Microphone 4 ... Karaoke reproduction
apparatus 5 ... DVD reproduction apparatus 6 ... BGM reproduction apparatus 12 ... Echo
generator
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