Circuit and method of reducing sidetone in a receive signal path

Details Circuit and method of reducing sidetone in a receive signal path Circuit and method of reducing sidetone in a receive signal path

1994-08-02

1997-07-15

Brown, Thomas W.

Telephonic communications

Substation or terminal circuitry

Sidetone control or hybrid circuit

379406, 379409, 379390, H04M 908

Patent

active

056490089

ABSTRACT:
A cordless telephone has receive (12) and transmit (14) signal paths for passing voice signals. Sidetones normally appear in the receive signal path from the near party's voice. A signal strength comparator (34) monitors the transmit signal path and the receive signal path and asserts a gain control signal when the transmit path signal strength exceeds a threshold set to a predetermined value below the receive path signal strength. The gain control signal decreases the gain (42) in the receive signal path to reduce undesirably loud sidetones in the speaker earpiece. When the transmit path signal strength is less than the predetermined threshold, the gain control signal is not asserted allowing maximum amplification in the receive signal path as the sidetone is sufficiently small as to not interfere with the main received voice signal, or otherwise become noticeably loud in the speaker earpiece.

REFERENCES:
patent: 5012139 (1991-04-01), Susak et al.
patent: 5245299 (1993-09-01), Bader et al.

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