JPS6171800

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DESCRIPTION JPS6171800
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
outdoor speaker amplification apparatus used in a disaster prevention administrative radio
system or the like, and more particularly to an outdoor speaker amplification apparatus in which
adjustment of speaker sound is considered according to wind direction. (Prior Art) The
configuration of an outdoor speaker loudspeaker station such as a disaster prevention
administrative radio system is a system for attaching a speaker to the top of a pillar with a height
lO = 15 m and broadcasting. This system has the disadvantage that, for example, when the wind
direction changes, such as in the night, summer or winter, the sound suddenly becomes small at
a place where the sound reaches, or conversely becomes large. Conventionally, in order to
correct the variation in the voice reach distance due to the change in the wind direction, a
maintenance person climbs on a pillar and adjusts the speaker direction b. (Object of the
Invention) An object of the present invention is to provide an outdoor speaker loud-speaker
capable of obtaining an almost constant sound f at each location around the speaker by adjusting
the sound pressure output level of the speaker according to the wind direction. There is K.
(Structure of the Invention) In order to achieve the above object, the outdoor speaker
loudspeaker system according to the present invention comprises one or more loudspeakers
having directivity, a wind direction detector, an audio output amplifier, and the output of the
wind direction detector. And an output regulator for adjusting the output level of the audio
output amplifier to provide a sound pressure output level suitable for the wind direction for each
of the speakers. According to the above configuration, since the sound pressure output level of
each speaker is adjusted according to the wind direction, the correction of the direction of the
speaker is unnecessary, and the object of the present invention is completely achieved. The
present invention will be described in more detail with reference to the drawings. FIG. 1 is a
circuit block diagram showing an embodiment of the outdoor speaker loudspeaker system
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according to the present invention. This figure is an example in which 21 speakers 1.1 'are
directed in the incoming direction and in the B direction, respectively. When the wind is blowing
in the incoming direction, the wind direction detector 4 detects the wind direction in the
incoming direction. The output regulator 3 is configured to output, for example, 50% of the
normal sound pressure output level for speakers in the same wind direction, and 100% audio
output level for the speakers in the opposite wind direction. . Therefore, under the above
conditions, the output from the amplifier 5 is adjusted so that the output to the speaker 1 is 50%
and the output to the speaker 2 is 100%, and the speaker 1.1 'is respectively connected via the
cable 2.2'. Sent to Here, the wind direction detector 4 is configured to monitor for a fixed time
after the wind changes in that direction, for one minute if it is released, and if there is no change
in the state, it outputs a detection output for that wind direction at that time. .
Therefore, it is possible to cope with the case where the wind direction is constantly changing.
(Effects of the Invention) As described above, according to the present invention, it is possible to
solve over-hearing and un-listening of the voice which is a problem in a speaker amplification
station installed in a wind direction or a frequently changing place as described in detail. The klx
is effective for coastal areas where the wind direction is completely reversed, such as from the
sea breeze to a sleepy by day or night. In addition, there is an advantage such as the reduction of
dangerous work due to the necessity of adjusting the direction of the speaker.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a circuit block diagram showing an embodiment of the outdoor speaker loudspeaker
according to the present invention.
1.1 ′ ··· Speaker 2.2 ′ ··· Speaker cable 3 ··· Output regulator 4 ··· Wind direction detector 5 ···
Amplifier
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