Hands-free speech communication apparatus

Details Hands-free speech communication apparatus Hands-free speech communication apparatus

1997-04-21

2000-08-01

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455550, 379406, 379410, H04B 138

Patent

active

060979712

ABSTRACT:
In a hands-free speech communication apparatus incorporating an echo canceler in a mobile telephone, a howling prevention unit for preventing howling caused due to leakage of a mobile-side loudspeaker output voice into a mobile-side microphone input during hands-free speech communication and an echo canceler for canceling an echo generated due to leakage of a transmission voice signal from a self line output terminal into a reception voice signal input to a self line input terminal are constituted by a one-chip digital signal processor. The digital signal processor is controlled by a microprocessor incorporated in an external cellular phone, thereby controlling/processing operation parameters of the howling prevention unit and the echo canceler on the basis of software.

REFERENCES:
patent: 5353348 (1994-10-01), Sendyk et al.
patent: 5479502 (1995-12-01), Ohga et al.
patent: 5604799 (1997-02-01), Komoda et al.
R. Roncella et al., "Single-chip adaptive FIR filter for acoustic echo canceller board," Single Processing European Journal Devoted to the Methods and Applications of Signal Processing, vol. 27, No. 3, Jun. 1992.

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