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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
volume control apparatus connected to a main speaker and a sub-speaker such as a subwoofer
that mainly outputs a low frequency band.
2. Description of the Related Art When using the non-fedder output from the audio equipment
body as a subwoofer output for connection to a bass speaker amplifier, this subwoofer output
includes three non-fedder outputs 1 from a microcomputer as shown in FIG. The adjustment is
made by the attenuation circuit 3 by 2a, 2b and 2c. In the above case, since the number of
attenuation circuits 3 is three, the number of subwoofer output steps is eight from the
combination thereof.
However, in the above-mentioned conventional volume control apparatus, since the subwoofer
output is taken from the non-fedder output (the output after passing the main volume), the subwoofer output interlocks with the main volume of the audio device main body and the non-feder
output The subwoofer output was to continue to be distorted regardless of the subwoofer output
adjustment value when the waveform of the waveform was distorted.
In addition, the number of steps was limited because the output adjustment was performed with
hard attenuation.
On the other hand, although there is also a method of using a subwoofer output-only twochannel electronic volume, it is to cause cost increase. Therefore, an object of the present
invention is to provide a volume control device capable of freely adjusting the subwoofer output.
To this end, the invention according to claim 1 comprises channel distribution means for
distributing audio input into sub-output channels and normal channels, and electronic means for
adjusting the audio level of each distributed channel. The volume, the operation means for
performing the main volume adjustment operation and the sub output volume adjustment
operation, and when the main volume operation is performed, the subwoofer output channel and
the normal channel of the electronic volume are adjusted and the sub output volume is operated
And a volume control unit that adjusts the volume of only the sub output channel of the
electronic volume.
Description of Configuration] Hereinafter, an embodiment of the present invention will be
described with reference to the drawings. FIG. 1 is a block diagram showing a hardware
configuration of a volume control apparatus according to an embodiment of the present
invention. In FIG. 1, reference numeral 1 denotes a DSP (Digital sound processor) circuit. Adjust
the acoustic characteristics of the signal, and output the front 2 channels and the rear 2
channels. During the output of the DSP circuit 1, the front two-channel outputs are respectively
further divided into two via the amplifiers 2 and 3 and inputted to the four channels of the sixchannel independent electronic volume 6. The 6 channel independent electronic volume 6
corresponds to TC 9482F of IC manufactured by Toshiba, etc. The volume circuit is built in all 6
channels, and the volume can be adjusted independently for each 6 channels by the adjustment
signal from the microcomputer (not shown).
On the other hand, during the output of the DSP circuit 1, the rear 2 channel outputs are
respectively input to the remaining 2 channels of the 6 channel independent electronic volume 6
via the amplifiers 4 and 5, and each electronic volume in the 6 channel independent electronic
volume 6 The left and right rear outputs 17 and 18 are input to the amplifiers 11 and 12,
The left and right front output signals from the DSP circuit 1 input to the 6-channel independent
electronic volume 6 are respectively divided into two, and amplifiers 7, 8, 9, 10 are transmitted
via the respective electronic volumes in the 6-channel independent electronic volume 6. And the
left and right subwoofer outputs 13, 14 and the left and right front outputs 15, 16, respectively.
Description of Operation] Here, the volume adjustment operation will be described using the
flowchart of FIG.
When the volume adjustment operation is performed in the audio device body, it is judged
whether or not it is a subwoofer volume adjustment (S1), and if it is not the adjustment of the
subwoofer, the up / down operation of the overall volume all 6 channels independent electronic
volume 6 The channel output is changed according to the volume adjustment operation (S2). On
the other hand, if the volume adjustment operation is subwoofer volume up / down adjustment,
only the left and right subwoofer outputs 13 and 14 are adjusted in accordance with the volume
adjustment in the 6-channel independent electronic volume 6 (S3), other, front, The rear output
is left unchanged (S4).
In addition, when the overall volume is adjusted, if the overall volume has already reached the
maximum value or the minimum value, the volume adjustment is invalidated, and when the
volume adjustment of the subwoofer is performed, the subwoofer volume is already maximum
When the value or the minimum value is reached, the volume adjustment is invalidated.
Incidentally, the present invention is not limited to the above embodiment, and various
modifications are possible.
For example, although the six channel independent electronic volume 6 is taken as an example in
the above embodiment, it is needless to say that the present invention can be similarly applied to
an eight channel or ten channel independent electronic volume.
As is apparent from the above description, according to the present invention, the number of
adjustment steps is significantly increased because the adjustment of the sub-output is
performed by a plurality of channels independent electronic volume for adjusting the overall
volume, and Since the score does not increase, the cost increase can be prevented.
Brief description of the drawings
1 is a block diagram showing an embodiment of the sound volume adjustment device according
to the present invention.
2 is a flow chart showing an embodiment of the present invention.
3 is a circuit diagram showing a configuration of a conventional volume control device.
Explanation of sign
1 ... DSP circuit 6 ... 6 channels independent electronic volume 13 ... left subwoofer output 14 ...
right subwoofer output