Method for active feedback suppression

Details Method for active feedback suppression Method for active feedback suppression

1990-02-20

1991-04-23

Dwyer, James L.

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379406, 379388, H04M 908

Patent

active

050105701

ABSTRACT:
A process to reduce the howl condition in a radiotelephone when the microphone picks up audio from the speaker. The condition is detected by first lowering the speaker volume (103) and measuring the microphone volume for a corresponding decrease (104). The speaker volume is then increased (105) and the microphone volume is again measured for a corresponding increase (106). If the microphone volume follows the speaker volume, a howl condition has been detected. To eliminate the condition without the volume fluctuations being noticed by the parties conversing, the microphone and speaker volume is reduced in small increments (114) until the condition is eliminated.

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patent: 4629829 (1986-12-01), Puhl et al.
patent: 4715063 (1987-12-01), Haddad et al.
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patent: 4764954 (1988-08-01), Tsurusaki et al.
patent: 4843621 (1989-06-01), Potratz
patent: 4879745 (1989-11-01), Arbel
patent: 4955055 (1990-09-01), Fujisaki et al.

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