Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1978-11-02
1980-12-23
Konick, Bernard
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455296, 455613, H04B 900
Patent
active
042412366
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.
REFERENCES:
patent: 3927316 (1975-12-01), Citta
patent: 3999132 (1976-12-01), Smith
patent: 4068093 (1978-01-01), Fidi
patent: 4081747 (1978-03-01), Meyerle
Phaselock Techniques (John Wiley & Sons, Inc.), Floyd M. Gardner, "Tracking and Acquistion," pp. 52-54, 1966.
Signetics Digital Linear MOS Applications, 1974, "Phase Locked Loop Applications," pp. 6-12, 6-13 and 6-39.
Plessey Semiconductors, "SL600 Series, Radio-communication Circuits," NPD.
Bell Telephone Laboratories Incorporated
Konick Bernard
Nimtz Robert O.
Popek Joseph A.
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