Acoustic communication system
作者： Paul W. Sutton
DOI:
关键词:
摘要: An acoustic communication system comprises: a voice processing circuit wh generates first signal representing message; noise sensor channel which second in response to detecting background an environment; microcomputer receives the and signals, provides third selected one of output ports microcomputer, where amplitude is functionally related value signal; ultrasonic coupled port message receiving pubic address audible signal.
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