Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1978-11-02
1980-09-09
Konick, Bernard
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455 42, 455 67, 455615, H04Q 704
Patent
active
042219329
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 turnoff. 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: 3909722 (1975-09-01), Bennett, Jr.
patent: 3927316 (1975-12-01), Citta
patent: 4068093 (1978-01-01), Fidi
patent: 4081747 (1978-03-01), Meyerle
Phaselock Techniques (John Wiley & Sons, Inc.), 1966, Floyd M. Gardner, "Tracking and Acquisition," pp. 52-54. _
Signetics Digital Linear MOS Applications, 1974, "Phase Locked Loop Applications," pp. 6-12, 6-13 and 6-39. _
Plessey Semiconductors, "SL600 Series Radio-Communications Circuits," NPD. _
Anglikowski Ronald E.
Hui George P.
Lese Gregory
Nash Donald H.
Bell Telephone Laboratories Incorporated
Konick Bernard
Nimtz Robert O.
Popek Joseph A.
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