Method and apparatus for feedback suppression

Details Method and apparatus for feedback suppression Method and apparatus for feedback suppression

1974-01-07

1976-03-16

Cooper, William C.

179 1HF, 179 1VC, H04M 120

Patent

active

039447430

ABSTRACT:
A system for suppressing positive feedback in acoustical-electrical devices having acoustic or electric feedback paths or a combination of both. Electrical signals from a microphone are transmitted through a sampling switch to a signal storage device. The transfer rate and duration are controlled by a pulse generator driven by an oscillator to time domain process the signals. The discrete signals output from the signal storage device are smoothed by a low pass filter and used to drive follow on circuitry, e.g., a speaker. A plurality of switches, signal storage devices, oscillators and pulse generators can be arranged in serial or parallel to provide various processing combinations. Several embodiments of the system are employed in a bidirectional telephone unit having separate incoming and outgoing signal channels to enable full duplex mode operation. In one embodiment, the incoming signals only are time domain processed and used to generate signals for controlling a voltage control gain block in the outgoing channel. In another embodiment, both the incoming and outgoing signals are time domain processed. In another embodiment, both the incoming and outgoing signals are time domain processed and voltage gain controlled by the signals in the opposite channel.

REFERENCES:
patent: 2568823 (1951-09-01), Potter
patent: 2723316 (1955-11-01), Goodell et al.
patent: 2980769 (1961-04-01), Lawsine
patent: 3429999 (1969-02-01), Stover
patent: 3602648 (1971-08-01), Holtz et al.
patent: 3665106 (1972-05-01), Parshad
patent: 3794763 (1974-02-01), Boudewijns

Affiliated with

Also associated with

Rating

Method and apparatus for feedback suppression does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for feedback suppression, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for feedback suppression will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-293782