Hands free telecommunication apparatus and method
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United States of America Patent
Stats
-
Mar 24, 1992
Grant Date -
N/A
app pub date -
Apr 26, 1990
filing date -
Oct 24, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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