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JPH0555700

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DESCRIPTION JPH0555700
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
stereo amplifier, and in particular, an on-off control of its speaker relay.
[0002]
2. Description of the Related Art In a conventional stereo amplifier, the relay of the center
speaker and the rear speaker is not turned off even when the front A and B speakers are turned
off, for example, when headphones are used while the surround is on Therefore, it is
inconvenient that the surround must be turned off or the center and rear volume values must be
minimized by key operation.
[0003]
SUMMARY OF THE INVENTION The present invention has been made in view of the abovedescribed point, and its object is to provide a stereo amplifier which is easy to use such as
headphones. .
[0004]
SUMMARY OF THE INVENTION The stereo amplifier according to the present invention is
configured to turn off the relays of the center and rear surround speakers when all the front
speaker relays are turned off. is there.
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1
[0005]
[Operation] According to the stereo amplifier of the present invention, when the relay of the front
speaker is turned off when using headphones, the relay of the surround speaker is turned off in
conjunction with it, so the surround key is keyed. Operation is convenient because it is not
necessary to turn off or minimize the center and rear volume values.
[0006]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A stereo amplifier according to an
embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a characteristic portion of a stereo amplifier according to an
embodiment of the present invention.
[0007]
In the figure, reference numeral 1 is a microcomputer having a ROM and a RAM built-in,
according to the program written in the ROM and the signal from the key matrix 2
[0008]
A relay 3 connects the amplifier and the front A-series speaker, and is driven by the
microcomputer 1.
[0009]
A relay 4 connects an amplifier and a front B-series speaker, and is driven by the microcomputer
1.
[0010]
Reference numeral 5 denotes a relay for connecting the amplifier and the surround center
speaker, which is driven by the microcomputer 1.
[0011]
Reference numeral 6 denotes a relay for connecting the amplifier and the surround rear speaker,
which is driven by the microcomputer 1.
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2
[0012]
Next, the characteristic operation of the present invention in the microcomputer 1 will be
described with reference to the flow chart of FIG.
[0013]
The routine shown in FIG. 2 is a routine that is always carried out after the operation involving
the switching of the speaker relay is performed.
[0014]
When this routine is called, it is first determined in step S1 whether the surround is on or not. If
it is not on, the routine is finished, and if it is on, the step S2 is performed. Migrate to
[0015]
In step S2, it is determined whether or not the front A-series speaker is on. If it is on, this routine
ends, and if it is not on, the process proceeds to step S3.
[0016]
In step S3, it is determined whether or not the front B-series speaker is on. If it is on, this routine
is finished. If it is not on, the process proceeds to step S4.
[0017]
In step S4, the center and rear speakers of the surround are forcibly turned off to end this
routine.
[0018]
By the above operation, when the front speaker relays are all turned off, the center and rear
surround speaker relays are turned off, and when the front speaker relays are turned off when
using headphones, In conjunction with this, since the surround speaker relay is turned off, it is
not necessary to turn off the surround key or to minimize the center and rear volume values.
[0019]
Effect of the Invention According to the stereo amplifier of this invention, the surround speaker is
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3
turned off only by turning off the switch for the front speaker without using the surround-related
operation when using headphones. Has the effect of improving
[0020]
Brief description of the drawings
[0021]
1 is a block diagram showing a characteristic portion of a stereo amplifier according to an
embodiment of the present invention.
[0022]
2 is a flow chart showing a characteristic portion of the microcomputer operation in the same
embodiment.
[0023]
Explanation of sign
[0024]
1 マイクロコンピュータ2 キーマトリックス3 Aスピーカリレー4 Bスピーカリレー5 センタ
ースピーカリレー6 リアスピーカリレー
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