Noise detector for frequency modulation systems

Details Noise detector for frequency modulation systems Noise detector for frequency modulation systems

1978-11-02

1980-10-14

Konick, Bernard

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455212, 455615, H04Q 704

Patent

active

042283205

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: 3873925 (1975-03-01), Eastmond
patent: 3939425 (1976-02-01), Toyoshima
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.

Affiliated with

Also associated with

Rating

Noise detector for frequency modulation systems does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Noise detector for frequency modulation systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Noise detector for frequency modulation systems will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2102219