Noise range indicating system
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United States of America Patent
Stats
-
Dec 23, 1980
Grant Date -
N/A
app pub date -
Nov 2, 1978
filing date -
Nov 2, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hands-free telephone system is disclosed utilizing an infrared transmitter and receiver to permit wireless speech transmission. The transmitter uses frequency modulation imposed on the infrared signal and includes carrier shift signaling arrangements for indicating a low battery condition and transmitter turn-off. The receiver utilizes a noise detection circuit for permitting remote turn-on, for squelching noise in the voice path, and for feeding an alerting signal to a loudspeaker to indicate that the received signal is excessively noisy. The portable transmitter must then be moved or redirected to provide a better line-of-sight signaling path.
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Family
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Cited Art Landscape
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