Noise mitigation and mode switching in communications terminals

Details Noise mitigation and mode switching in communications terminals Noise mitigation and mode switching in communications terminals

1989-12-27

1991-10-15

Ng, Jin F.

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379388, 379389, H04M 908

Patent

active

050581538

ABSTRACT:
A circuit to improve noise mitigation and mode switching in telephony, wherein the noise-floor level is continuously estimated by comparing its stored current value to the signal level value and substituting the latter for the former if it is less than the former.

REFERENCES:
patent: 3751602 (1973-08-01), Breeden
patent: 3894187 (1975-07-01), Shibata et al.
patent: 3925618 (1975-12-01), Kato et al.
patent: 3952166 (1976-04-01), Kato et al.
patent: 4513177 (1985-04-01), Nishino et al.
patent: 4571461 (1986-02-01), Uno et al.
patent: 4715063 (1987-12-01), Haddad et al.
patent: 4796287 (1989-01-01), Reesor et al.

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