Public address system
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United States of America Patent
Stats
-
Jun 23, 1981
Grant Date -
N/A
app pub date -
Jul 24, 1979
filing date -
Jul 27, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A public address system having a microphone, an amplifier which amplifies the output from the microphone and a speaker assembly which receives the output from the amplifier and reproduces a sound, in which the microphone is provided with a transmitter generating an electromagnetic wave and the speaker assembly has two receiving coils disposed perpendicular to each other. The outputs from the receiving coils are used to control the level of an audio signal applied to the speaker assembly and thereby to avoid the occurrence of howling.
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Family
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Cited Art Landscape
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