Duplex hands-free communications circuit

Details Duplex hands-free communications circuit Duplex hands-free communications circuit

1985-12-11

1988-02-16

Ng, Jin F.

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379389, H04B 320

Patent

active

047260629

ABSTRACT:
A circuit for reducing the effect of acoustic and electrical feedback in duplex "hands free" telephone sets. The circuit uses relatively simple and inexpensive gain control circuits and expanders to reduce the effects of feedback by controlling the gain of a transmitted signal in inverse relationship to the strength of a the received signal.

REFERENCES:
patent: 2825764 (1958-03-01), Edwards et al.
patent: 3462561 (1969-08-01), Deman
patent: 3591735 (1971-07-01), Brooks
patent: 3596011 (1971-07-01), Alexandrovich
patent: 3885111 (1975-05-01), Ishigami et al.
patent: 3975588 (1976-08-01), Besseyre et al.
"The New Speakerphone-Executive Model", R. T. Cleary et al., Automatic Electric Technical Journal, Jul. 1961, vol. 7, No. 7, pp. 232-238.

Affiliated with

Also associated with

Rating

Duplex hands-free communications circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Duplex hands-free communications circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Duplex hands-free communications circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2225900