Telephones with talker sidetone

Details Telephones with talker sidetone Telephones with talker sidetone

1996-11-22

1999-08-31

Le, N.

Telephonic communications

Substation or terminal circuitry

Sidetone control or hybrid circuit

379390, 379388, H04M 100

Patent

active

059463910

ABSTRACT:
A telephone, particularly a portable handset operable in a digital radio telephone system, has a sidetone gain circuit 28 which applies one of two levels of gain G1 G2 dependent on whether a detector 30 detects a high magnitude of input signal 14 corresponding to speech or a low level of input signal 14 corresponding to an idle condition. With varying magnitude of input signal 14, the gain switches between G1 and G2 dependent on two thresholds T1 and T2 of the input signal, the relationship including hysteresis to prevent unduly rapid switching.

REFERENCES:
patent: 4081620 (1978-03-01), Goodman et al.
patent: 4445002 (1984-04-01), Terry
patent: 4715062 (1987-12-01), Korsky et al.
patent: 5640450 (1997-06-01), Watanabe
patent: 5692042 (1997-11-01), Sacca

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