Telephone set in which an echo signal is effectively cancelled i

Details Telephone set in which an echo signal is effectively cancelled i Telephone set in which an echo signal is effectively cancelled i

1995-03-20

1997-12-16

Zele, Krista

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379388, 379406, 379410, 379420, H04M 908

Patent

active

056994230

ABSTRACT:
In a telephone set having a receiver (42) and a loudspeaker (39), a switch circuit (37) selects supply of a reception speech signal, transmitted from a counterpart section (60), to the receiver or the loudspeaker in response to a selection signal. A first adaptive echo canceller (43a) produces a pseudo echo signal with reference to the reception speech signal. A controller (44) controls operation of the first adaptive echo canceller in response to the selection signal to optimize the pseudo echo signal. A first digital adder (35a) carries out a particular calculation between the pseudo echo signal and a transmission speech signal, relating to the transmission sound supplied to a microphone (46). The adder produces a particular calculation result signal representative of a result of the particular calculation. In accordance with the particular calculation result signal, a transmission is carried out towards the counterpart section.

REFERENCES:
patent: 4847887 (1989-07-01), Suzuki et al.
patent: 4905270 (1990-02-01), Ono
patent: 5239586 (1993-08-01), Marui
patent: 5263079 (1993-11-01), Umemoto
patent: 5313498 (1994-05-01), Sano
patent: 5353348 (1994-10-01), Sendyk et al.
patent: 5379338 (1995-01-01), Umemoto et al.
patent: 5384843 (1995-01-01), Masuda et al.
patent: 5400399 (1995-03-01), Umemoto et al.
patent: 5559793 (1996-09-01), Maitra et al.

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