Circuit for preventing acoustic feedback

Details Circuit for preventing acoustic feedback Circuit for preventing acoustic feedback

1977-12-21

1979-08-21

Claffy, Kathleen H.

179 1FS, H04M 120

Patent

active

041654455

ABSTRACT:
This hands-free telephone prevents acoustic feedback between its speaker and microphone by attenuating either the transmission or receive path under the control of a corresponding pair of counters (computers), each counter sensing the signal divided and digitized from its corresponding path. An increase in counted pulses indicates feedback and causes a counter to more quickly reach a predetermined counter state (count), to trigger attenuation (damping) before it can be reset (restored) to zero by the other counter.

REFERENCES:
patent: 3296373 (1967-01-01), Suganuma
patent: 3934085 (1976-01-01), Munson et al.
patent: 3975588 (1976-08-01), Besseyre et al.

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