Double talk detection and echo control circuit

Details Double talk detection and echo control circuit Double talk detection and echo control circuit

1997-07-10

2000-04-18

Isen, Forester W.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379411, 379406, H04M 158

Patent

active

060524626

ABSTRACT:
In a full duplex audio telecommunication system, it is desirable to determine whether a transmitted signal contains a signal component generated exclusively at one end of the communication path. A removal filter is connected to receive a Far-End signal and to remove a signal component therefrom. A detection filter is connected to receive a Near-End signal and to detect the presence of a signal component corresponding to the component removed from the Far-End signal. A decision stage connected with the detection filter responds to the detection filter by actuating a control signal when signal activity in the selected signal component is detected. The control signal is used to control adaption of an AFIR filter of an echo canceler to prevent adaption during intervals of Near-End speech activity. The selected signal component preferably comprises a predetermined frequency range.

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