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DESCRIPTION JP2003108162

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DESCRIPTION JP2003108162
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker volume automatic control apparatus suitable for a karaoke apparatus or the like.
[0002]
2. Description of the Related Art FIG. 4 shows a conventional karaoke apparatus. In FIG. 4, the
karaoke music signal 1 output from the karaoke machine and the microphone audio signal 2
output from the wired or wireless microphone system are adjusted in volume by the mixing
amplifier 3 to be synthesized and amplified to be a speaker system. Applied to The speaker
system 4 is composed of a plurality of speaker units, here four speakers A to D, and outputs the
same volume preset in the mixing amplifier 3.
[0003]
However, in the above-described conventional example, since the plurality of speakers A to D
output the same volume regardless of the position of the microphone (the position of the singer),
the following problems are posed. is there. When the singer is far from the speakers A to D, it is
difficult to listen and to sing when the volume is insufficient. Also, at this time, if the volume of
the speakers A to D is increased, it is noisy for a listener close to the speakers A to D. This
problem is noticeable when a large number of speakers are distributed and installed in a large
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area.
[0004]
SUMMARY OF THE INVENTION In view of the problems of the prior art, it is an object of the
present invention to provide a speaker volume automatic control apparatus which can
automatically adjust the volume to an optimum volume for a singer and a listener.
[0005]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention
detects the distance between a microphone and each of a plurality of loudspeakers and raises the
volume of the speaker closest to the microphone. It is something like that.
That is, according to the present invention, distance detection means for detecting the distance
between a microphone and each of a plurality of loudspeakers, and volume control means for
raising the volume of the speaker closest to the distance detected by the distance detection
means And a speaker volume automatic control device is provided.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings. FIG. 1 is a block diagram showing a karaoke
apparatus as one embodiment of a speaker volume automatic control device according to the
present invention, FIG. 2 is a flow chart for explaining the operation of the speaker volume
automatic control device of FIG. It is explanatory drawing which shows the example of
installation of a karaoke apparatus.
[0007]
In FIG. 1, a karaoke music signal 1 output from a karaoke machine (not shown) and a
microphone audio signal 2 output from a wired or wireless microphone 2a are synthesized by a
mixer 3a. Then, the signals synthesized by the mixer 3 a are commonly applied to the volume
control units 12-1 and 12-2 to 12-n, and are amplified by respective gains based on the control
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of the control unit 10. Next, the output signals of the volume control units 12-1 to 12-n are
amplified with fixed gains by the main amplifiers 13-1 and 13-2 to 13-n, respectively, and the
speakers 14-1 and 14-2 to 14- applied to n.
[0008]
The microphone 2a is provided with an infrared light emitting unit (not shown). When the
microphone 2a is wireless, the infrared light emitting unit emits infrared light of a predetermined
level when the power switch (not shown) is turned on. In the vicinity of each of the speakers 141 to 14-n, sensors 15-1 and 15-2 to 15-n for receiving infrared rays are arranged, respectively.
Therefore, the sensors 15-1 to 15-n are each connected to the microphone 2a It receives infrared
light of a level according to the distance of and converts it into a voltage. Each voltage converted
by the sensors 15-1 to 15-n is A / D converted by the control unit 10 to detect an infrared light
reception level, and then each light reception level is compared by the CPU 11 in the control unit
10 and the comparison result The respective gains of the volume control units 12-1 to 12-n are
controlled based on
[0009]
The volume control units 12-1 to 12-n may be analog switching systems or electronic volume
systems. In the case of the analog switching system, the gain of each system can be controlled by
a plurality of volume control circuits and relays. Further, in the case of the electronic volume
system, the gain of each system can be controlled by the value stored in the memory of the CPU
11.
[0010]
The operation will now be described with reference to FIG. First, when the switch of the wireless
microphone 2a is turned on (step S1), the output signals of the sensors 15-1 to 15-n are taken in,
A / D converted and digitized (step S2), and then each numerical value is compared The system
having the largest amount of received light is selected (step S3). If the selected system is the
same as the previous one, the process returns from step S4 to step S2. On the other hand, if not
the same, the process proceeds from step S4 to step S5. And increase the gain of the volume
control unit 12 of the other system as a default value.
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[0011]
Therefore, for example, when a large number of speakers are dispersedly installed in a large area
as shown in FIG. 3, the volume of the microphone 2a, that is, the closest speaker of the singer
becomes larger than that of the other speakers. Volume can be adjusted automatically. The gains
of the system for raising the volume and the system not for raising the volume may be preset in
the control unit 10 according to, for example, the installation environment as shown in FIG.
[0012]
As described above, according to the present invention, the distance between the microphone
and each of the plurality of speakers is detected to increase the volume of the speaker closest to
the microphone. The volume can be automatically adjusted to the optimum volume for the singer
and the listener.
[0013]
Brief description of the drawings
[0014]
1 is a block diagram showing a karaoke apparatus as an embodiment of a speaker volume
automatic control apparatus according to the present invention.
[0015]
2 is a flowchart for explaining the operation of the speaker volume automatic control device of
FIG.
[0016]
3 is an explanatory view showing an installation example of the karaoke apparatus of FIG.
[0017]
4 is a block diagram showing a conventional karaoke apparatus.
[0018]
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Explanation of sign
[0019]
2a Microphone 10 Control unit 11 CPU 12-1 to 12-n Volume control unit 14-1 to 14-n Speaker
15-1 to 15-n sensor
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