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JPH04107100

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DESCRIPTION JPH04107100
[0001]
The present invention relates to a control device for an audio device having a front amplifier, a
rear amplifier, and a center amplifier, and more particularly to a control device for an audio
device that operates to suppress heat generation in the device. (B) Problems to be solved by the
prior art / invention In the conventional surround amplifier having the front amplifier, rear
amplifier and center amplifier, the above three amplifiers always operate, so the temperature rise
in one device becomes large, and the temperature rise If you try to reduce the problem, you have
the problem that the transformer and the radiator become large. The present invention has been
made in view of the above-described point, and an object thereof is to provide a control device of
an audio device capable of suppressing a temperature rise in the device and miniaturizing a
transformer or a radiator. Where are you going? (Iii) Means for Solving the Problem The control
device for audio equipment according to the present invention comprises a first amplifier, a
second amplifier, a speaker connected to the second amplifier and the second amplifier, and A
first voltage or a second voltage selectively applied to the first amplifier and the second amplifier,
and an impedance changeover switch for selecting an impedance of a speaker connected to the
first amplifier. When the impedance of the power supply circuit to be connected and the speaker
connected to the first amplifier is a first impedance, a first voltage is applied to the two
amplifiers, and the impedance of the speaker connected to the first amplifier is second Power
supply circuit control means for controlling the power supply circuit to apply a second voltage
higher than the first voltage to the amplifier at an impedance of When dance selector switch
selects a second impedance, which is constituted by the relay control unit allowed to control the
relay to the disconnection state. (D) Operation According to the present invention, when the
impedance of the front speaker is 8Ω, when the impedance selector switch is switched to the 8Ω
side, the power supply circuit control means operates the high voltage output of the power
supply circuit as the front amplifier, rear amplifier and center amplifier. Apply to At the same
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time, since the relay control means turns off both the relay of the rear amplifier and the relay of
the center amplifier, it is possible to reduce the capacity of the transformer and the shape of the
radiator. Further, if the impedance of the front speaker is 4Ω, the impedance changeover switch
is switched to the 4Ω side, so the power supply circuit control means controls the power supply
circuit to apply a low voltage to the front amplifier, rear amplifier and center amplifier.
However, since the voltage of the power supply circuit is determined so that an excessive current
does not flow to the speaker, it is possible to reduce the capacity of the transformer and the
shape of the radiator. (E) Embodiment An embodiment of a control device for audio equipment
according to the present invention will be described based on FIG. In the figure, 1 is a rear
amplifier, 2 is a speaker serving as a load of the rear amplifier I, 3 is a relay provided between
the output end of the rear amplifier 1 and the speaker 2, 4 is a center amplifier, and 5 is a load
for the center amplifier 4. A speaker 6 is a relay provided between the output end of the center
amplifier 4 and the speaker 5. A power supply 7 selectively applies a first voltage or a second
voltage to the front amplifier F, the center amplifier 4 and the rear amplifier 1. A circuit 8 is an
impedance changeover switch for selecting the impedance of the speaker S connected to the
front amplifier F 9 is a microcomputer for controlling the audio apparatus of the present
invention based on the impedance changeover switch 8 10 is a speaker S connected to the front
amplifier F The first voltage is applied to the three amplifiers when the impedance of the Power
supply circuit control means provided in the microcomputer 9 for applying a second voltage
higher than the first voltage to the amplifier S when the impedance of the speaker S connected to
the front amplifier F is 8 Ω, 11 is an impedance changeover switch 8 is the speaker impedance 8
Ω Is selected, the relay control means provided in the microcomputer 9 to turn off the relays 3
and 6. In the control device for audio equipment configured as described above, when the
impedance of the speaker S is 8Ω, the dual power supply circuit control means 10 front
amplifier the high voltage output of the power supply circuit 7 when the impedance changeover
switch 8 is switched to the 8Ω side. Apply to F, rear amplifier 1 and center amplifier 4 At the
same time, relay control means I! Since both the relay 3 of the rear amplifier 1 and the relay 6 of
the center amplifier 4 are turned off, it is possible to reduce the capacity of the transformer and
the shape of the radiator (both not shown). Further, if the impedance of the speaker S is 4Ω, the
impedance changeover switch 8 is switched to the 4Ω side, so the power supply circuit control
means 10 applies the low voltage to the front amplifier F1 rear amplifier 1 and the center
amplifier 4 Control. However, since the voltage of the power supply circuit 7 is determined so
that an excessive current does not flow to the speakers S and 2.5, the capacity of the transformer
and the shape of the radiator can be reduced.
(E) Effects of the Invention According to the control device for audio equipment of the present
invention, since the configuration is as described above, the temperature rise in the equipment is
reduced. This improves the reliability of one device. In addition, since it is possible to reduce the
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capacity of the transformer and the shape of the radiator, the mounting density of parts can be
improved, and the cost can be further reduced. In addition, it has excellent features such as easy
implementation because one circuit structure is simple.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram showing an embodiment of a control device for audio equipment
according to the present invention.
Description of main symbols 1: Rear amplifier 2.5. S: speaker 3.6 = relay 4: center amplifier 7:
power supply circuit 8: impedance changeover switch 9: microcomputer 10: power supply circuit
control means 11: relay control means F: front amplifier
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