Hands free telecommunication apparatus and method

Details Hands free telecommunication apparatus and method Hands free telecommunication apparatus and method

1990-04-26

1992-03-24

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

379390, 379411, H04M 160

Patent

active

050994727

ABSTRACT:
In a hands free communications terminal apparatus, a loudspeaker and a microphone are permitted to be simultaneously active. A controller monitors signals in transmit and receive paths to direct operations of transversal filters to provide two echo canceller functions, one for the microphone and one for a telephone line so that most unwanted echo and feedback is removed, to prevent the howling and squealing sounds that commonly occur when the loudspeaker and the microphone are both active. Remaining echoes are removed by voice switching of loss between transmit and receive paths, wherein the amount of loss is determined in response to characteristics of the telephone line and the operating environment of the terminal apparatus.

REFERENCES:
patent: 2696529 (1954-12-01), Bachelet et al.
patent: 2702319 (1955-02-01), Ryall
patent: 3889059 (1975-06-01), Thompson et al.
patent: 4225754 (1980-09-01), Bernard et al.
patent: 4578543 (1986-03-01), LeBourlot et al.
patent: 4989242 (1991-01-01), Arnaud
patent: 5007046 (1991-04-01), Erving et al.

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