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DESCRIPTION JP2004104649

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DESCRIPTION JP2004104649
[PROBLEMS] To provide a powered speaker system capable of controlling an output of a free
audio signal by external control in a speaker system having a power amplification circuit.
SOLUTION: A sound source is inputted from the outside, voltage amplification of a signal
inputted by a pre-amplification unit 102 is performed, power amplification of a signal voltageamplified by an amplification unit 103 is carried out, and a voltage-amplified signal is amplified
by a speaker 104 In the speaker system, the control signal detection unit 106 detects a control
signal input from the control signal input terminal 105, and the power control unit 107 controls
the power on / off of the pre-amplification unit 102 and the amplification unit 103. , The audio
output from the speaker 104 is controlled from the outside. [Selected figure] Figure 1
スピーカーシステム
[0001] The present invention relates to a powered speaker system in audio equipment. [0002] A
powered speaker system, which is an audio device, is a speaker system equipped with a power
amplifier, and is mainly used in schools, meeting rooms, commercial facilities, and the like. As
conventional speaker systems, for example, the following are known. This speaker system picks
up the sound reproduced by the microphone placed at the listening position, divides the pickedup signals by band pass filters having different bands, and amplifies the divided signals
respectively. The reproduction sound pressure levels of the plurality of speakers can be adjusted
simply and quickly by controlling the adjustment attenuator so as to be the same (see, for
example, Patent Document 1). In addition, a powered speaker system usually turns the power on
and off manually and amplifies the amplified signal at the amplifier. Here, a conventional
powered speaker system is shown in FIG. As shown in FIG. 4, the conventional powered speaker
system includes an audio signal input terminal 401 for inputting a sound source from the outside
for performing a microphone, BGM broadcasting or the like, a pre-amplifying unit 402 for
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amplifying the voltage of the input signal, Manual power control for manually controlling the
power supply of the amplifier 404 for power amplification of the signal input from the preamplification unit 402, the speaker 404 for amplifying the sound power-amplified by the
amplifier 403, and the pre-amplification unit 402 and amplifier 403 A section 405 amplifies and
amplifies the input voice. At this time, it is necessary to manually operate the manual power
supply control unit 405 in order to stop the loudspeaker operation and the operation stop.
However, in such a conventional powered speaker system, the manual power control must be
performed. There has been a problem that the control of the loudspeaker operation by remote
control can not be freely performed. The present invention has been made to solve such a
problem, and provides a powered speaker system capable of freely controlling the output of an
audio signal by external control. A speaker system according to the present invention includes an
audio signal input terminal for inputting a sound source from the outside, a pre-amplifying unit
for amplifying a voltage of a signal input from the audio signal input terminal, and An
amplification unit for power-amplifying a signal voltage-amplified in the pre-amplification unit; a
speaker for amplifying a signal power-amplified in the amplification unit; and a power supply of
the pre-amplification unit and the amplification unit. A control signal input terminal for inputting
a control signal, a control signal detection unit for detecting a control signal input from the
control signal input terminal, and the pre-amplification unit and the amplification unit according
to the control signal detection by the control signal detection unit And a power control unit for
controlling the power supply of
With this configuration, when a control signal is input from the control signal input terminal, the
control signal input to the control signal detection unit is detected, and the power control unit
performs pre-amplification according to the control signal detection of the control signal
detection unit. Control the power supply of the unit and amplifier. As a result, the external sound
source input from the audio signal input terminal is voltage-amplified by the pre-amplification
unit, power-amplified by the amplification unit, and amplified from the speaker. Therefore, by
inputting the control signal from the control signal input terminal, the loudspeaker operation can
be controlled, so that the loudspeaker operation of the speaker system can be controlled by
remote control. Further, in the speaker system of the present invention, the power control unit is
characterized in that an operation signal of a surveillance camera is inputted, and the power
supply of the pre-amplification unit and the amplification unit is controlled according to the
operation signal. Have the following configuration. According to this configuration, when the
surveillance camera operates, an operation signal of the surveillance camera is sent to the power
control unit, and the power control unit controls the power of the pre-amplification unit and the
amplification unit according to the operation signal input from the surveillance camera. Control.
As a result, the external sound source input from the audio signal input terminal is voltageamplified by the pre-amplification unit, power-amplified by the amplification unit, and amplified
from the speaker. Therefore, since the loudspeaker operation can be controlled according to the
operation of the surveillance camera, the loudspeaker operation and loudspeaker operation can
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be automatically stopped in synchronization with the operation of the surveillance camera.
Furthermore, the speaker system of the present invention is characterized in that the power
supply control unit receives an operation signal of a human body sensor and controls the power
supply of the pre-amplification unit and the amplification unit according to the operation signal.
Have the following configuration. With this configuration, when the human body sensor
operates, the operation signal of the human body sensor is sent to the power control unit, and
the power control unit controls the power supply of the pre-amplification unit and the
amplification unit according to the operation signal input from the human body sensor. Control.
As a result, the external sound source input from the audio signal input terminal is voltageamplified by the pre-amplification unit, power-amplified by the amplification unit, and amplified
from the speaker. Therefore, the loudspeaker operation can be controlled according to the
operation of the human body sensor, so that the loudspeaker operation and the operation stop of
the powered speaker system can be automatically performed in response to the human detection
by the human body sensor. . DETAILED DESCRIPTION OF THE INVENTION Embodiments of the
present invention will be described below with reference to the drawings.
First Embodiment First, a configuration diagram of a powered speaker system according to a first
embodiment of the present invention is shown in FIG. As shown in FIG. 1, in the powered speaker
system according to the first embodiment of the present invention, an audio signal input terminal
101 for inputting a sound source from the outside for performing a microphone, BGM
broadcasting or the like, an audio signal input A pre-amplification unit 102 for voltageamplifying the signal input to the terminal 101, an amplification unit 103 for power-amplifying
the voltage-amplified signal to the pre-amplification unit 102, a speaker 104 for amplifying the
sound power-amplified by the amplification unit 103; Control signal input terminal 105 for
inputting a control signal for controlling power on and off, control signal detection unit 106 for
detecting a control signal inputted from control signal input terminal 105, and control signal in
control signal detection unit 106 The power supply control unit 107 controls the power supply
of the pre-amplification unit 102 and the amplification unit 103 according to the detection. Next,
the operation of the powered speaker system according to the present embodiment will be
described. In the present powered speaker system, when a control signal is input from the
control signal input terminal 105, the control signal input to the control signal detection unit
106 is detected. When the control signal detection unit 106 detects a control signal, the power
supply control unit 107 controls the power supply of the pre-amplification unit 102 and the
amplification unit 103. Here, when the pre-amplification unit 102 and the amplification unit 103
are controlled to the power-on state by the control signal, an external sound source input from
the audio signal input terminal 101 is signaled by the pre-amplification unit 102. Voltage
amplification is performed, and the signal amplified in voltage by the pre-amplification unit 102
by the amplification unit 103 is power-amplified. Then, the sound power-amplified by the
amplification unit 103 is amplified from the speaker 104. When the pre-amplification unit 102
and the amplification unit 103 are controlled to be in the power-off state, the speaker 104 does
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not make a loud sound. As described above, according to the powered speaker system of the
present embodiment, since the loudspeaker operation can be controlled by the control signal
input from the control signal input terminal, the powered speaker system can be remotely
operated. The loudspeaker operation can be controlled. Second Embodiment A configuration
diagram of a powered speaker system according to a second embodiment of the present
invention is shown in FIG. As shown in FIG. 2, in a powered speaker system according to a second
embodiment of the present invention, an audio signal input terminal 201 for inputting a sound
source from the outside for performing a microphone, BGM broadcasting or the like, an audio
signal input A pre-amplification unit 202 that performs voltage amplification of the signal input
to the terminal 201, an amplification unit 203 that performs power amplification of the voltageamplified signal to the pre-amplification unit 202, a speaker 204 that amplifies the sound that is
power-amplified by the amplification unit 203, A monitoring camera 205 and a power control
unit 206 that controls power supplies of the pre-amplifying unit 202 and the amplifying unit 203
in synchronization with the operation of the monitoring camera 205 are provided.
The powered speaker system of the present embodiment has a basic configuration similar to that
of the powered speaker system corresponding to the first embodiment shown in FIG. 1, and the
powered speaker system of the present embodiment can be used. The audio signal input terminal
201, the pre-amplification unit 202, the amplification unit 203, and the speaker 204 are the
same as the audio signal input terminal 101, the pre-amplification unit 102, the amplification
unit 103, and the speaker 104 in the powered speaker system of the first embodiment. It is a
thing. Further, the feature of the present embodiment is that a surveillance camera 205 is
provided to the powered speaker system corresponding to the first embodiment shown in FIG.
The other configuration is the same as that of the powered speaker system corresponding to the
first embodiment. Next, the operation of the powered speaker system according to the present
embodiment will be described. In the present powered speaker system, when the monitoring
camera 205 operates, an operation signal of the monitoring camera 205 is sent to the power
control unit 206. When the operation signal is input from the monitoring camera 205, the power
control unit 206 controls the power of the pre-amplification unit 202 and the amplification unit
203. Here, when the pre-amplifying unit 202 and the amplifying unit 203 are controlled to the
power-on state by the operation signal of the monitoring camera 205, the external sound source
input from the audio signal input terminal 201 is pre-amplified. The unit 202 performs voltage
amplification of the signal, and the amplification unit 203 power-amplifies the signal voltageamplified by the pre-amplification unit 102. Then, the audio power-amplified by the amplification
unit 203 is amplified from the speaker 204. When the pre-amplification unit 202 and the
amplification unit 203 are controlled to be in the power-off state, the speaker 204 does not make
a loud sound. As described above, according to the powered speaker system of the present
embodiment, the loudspeaker operation can be controlled in accordance with the operation of
the surveillance camera, and therefore, the powered speaker system is synchronized with the
operation of the surveillance camera. And the stop of the operation can be performed
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automatically. Third Embodiment Next, a configuration diagram of a powered speaker system
according to a third embodiment of the present invention is shown in FIG. As shown in FIG. 3, in
a powered speaker system according to a third embodiment of the present invention, an audio
signal input terminal 301 for inputting a sound source from the outside for performing a
microphone, BGM broadcasting or the like, an audio signal input A pre-amplification unit 302
that performs voltage amplification of the signal input to the terminal 301, an amplification unit
303 that performs power amplification on the voltage-amplified signal in the pre-amplification
unit 302, a speaker 304 that amplifies the sound power-amplified by the amplification unit 303,
A power supply control unit 306 is provided which controls power supplies of the preamplification unit 302 and the amplification unit 303 in synchronization with the operation of
the human body sensor 305 and the human body sensor 305.
The powered speaker system of the present embodiment has a basic configuration similar to that
of the powered speaker system corresponding to the second embodiment shown in FIG. 2, and in
the powered speaker system of the present embodiment The audio signal input terminal 301, the
pre-amplification unit 302, the amplification unit 303, and the speaker 304 are the same as the
audio signal input terminal 201, the pre-amplification unit 202, the amplification unit 203, and
the speaker 204 in the powered speaker system of the second embodiment. It is a thing. Further,
the feature of this embodiment is that a human body sensor 305 is provided to the powered
speaker system corresponding to the second embodiment shown in FIG. The other configuration
is the same as that of the powered speaker system corresponding to the second embodiment.
Next, the operation of the powered speaker system according to the present embodiment will be
described. In the present powered speaker system, when the human body sensor 305 operates,
an operation signal of the human body sensor 305 is sent to the power control unit 306. When
the operation signal is input from the human body sensor 305, the power control unit 306
controls the power of the pre-amplification unit 302 and the amplification unit 303. Here, when
the pre-amplifying unit 302 and the amplifying unit 303 are controlled to the power-on state by
the operation signal of the human body sensor 305, the external sound source input from the
audio signal input terminal 301 is pre-amplified. The portion 302 performs voltage amplification
of the signal, and the amplification portion 303 power-amplifies the signal voltage-amplified by
the pre-amplification portion 102. Then, the audio power-amplified by the amplification unit 303
is amplified from the speaker 304. When the pre-amplification unit 302 and the amplification
unit 303 are controlled to be in the power-off state, the speaker 304 does not make a loud
sound. As described above, according to the powered speaker system of the present embodiment,
since the loudspeaker operation can be controlled in accordance with the operation of the human
body sensor, it is possible to respond to human detection by the human body sensor. It is
possible to automatically perform the loud sound operation and the operation stop of the speaker
system. As described above, in the speaker system according to the present invention, when a
control signal is input from the control signal input terminal, the control signal input to the
control signal detection unit is detected, and the control signal detection unit is detected. The
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power supply control unit controls the power supply of the pre-amplification unit and the
amplification unit according to the detection of the control signal.
As a result, the external sound source input from the audio signal input terminal is voltageamplified by the pre-amplification unit, power-amplified by the amplification unit, and amplified
from the speaker. Therefore, since the loudspeaker operation can be controlled by inputting the
control signal from the control signal input terminal, the loudspeaker system having an excellent
effect that the loudspeaker operation of the loudspeaker system can be controlled by remote
control is provided. It can be done. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block
diagram showing a configuration of a powered speaker system according to a first embodiment
of the present invention. FIG. 2 is a configuration of a powered speaker system according to a
second embodiment of the present invention. 3 is a block diagram showing the configuration of a
powered speaker system according to a third embodiment of the present invention. FIG. 4 is a
block diagram showing the configuration of a conventional powered speaker system. Terminal
102 pre-amplification unit 103 amplification unit 104 speaker 105 control signal input terminal
106 control signal detection unit 107 power control unit 201 audio signal input terminal 202
pre amplification unit 203 amplification unit 204 speaker 205 monitoring camera 206 power
control unit 301 audio signal input terminal 302 pre-increase Part 303 amplifying unit 304
speaker 305 human sensor 306 the power supply control unit 401 the audio signal input
terminal 402 pre-amplifier 403 amplifying unit 404 Speaker 405 manual power controller
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