Voice controlled attenuation adjustment in telephone transmissio

Details Voice controlled attenuation adjustment in telephone transmissio Voice controlled attenuation adjustment in telephone transmissio

1989-02-06

1991-02-05

Ng, Jin F.

Multiplex communications

Wide area network

Packet switching

379406, 379410, H04J 100

Patent

active

049911678

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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"Improvement of Acoustic Feedback Stability by Frequency Shifting", M. R. Schroeder, The Journal of Acoustical Society of America, vol. 36, No. 7, Sep. 1964, pp. 1718-1724.

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