Voice controlled attenuation adjustment in telephone transmission circuits
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United States of America Patent
Stats
-
Feb 5, 1991
Grant Date -
N/A
app pub date -
Feb 6, 1989
filing date -
Aug 22, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process and apparatus for a voice controlled attenuation adjustment in telephone transmission circuits is disclosed. Signals in the sending and receiving directions are decomposed into sub-band signals in a set of frequency sub-bands. Each frequency sub-band is associated with an attenuation device for each direction of transmission. Depending on the level of activity in each direction in a particular sub-band, the attenuation values of the attenuation devices of that particular sub-band are adjusted. The sub-band signals are then recombined.
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