Method and apparatus for implementing hardware independent echo

Details Method and apparatus for implementing hardware independent echo Method and apparatus for implementing hardware independent echo

1994-12-28

1996-02-27

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

379410, H04B 320

Patent

active

054954738

ABSTRACT:
A method and apparatus for implementing the removal of electronic or acoustic echo from a full-duplex audio data stream. Audio data which has been input into a processing system is sampled at a predetermined rate. Audio data which has been received by the processing system and which is to be output from the processing system is also sampled. Each sample of the output audio data corresponds in time to the most recent sample of the input audio data and approximates the value of the output audio data at the time the most recent sample of the input audio data was acquired. A storage device is provided for storing N samples of the input audio data and N corresponding samples of the output audio data, where N is a positive integer. N samples of the input audio data and N corresponding samples of the output audio data are stored in the storage device, such that the contents of the storage device represent both the input audio data and an approximation of corresponding output audio data during a given time interval. This combined input/output can be routed through the processing system or across a communications network to another processing system, and the echo can be ignored or removed at any point by a cancellation device.

REFERENCES:
patent: 5193112 (1993-03-01), Sano
patent: 5278872 (1994-01-01), Greenberg
patent: 5371789 (1994-12-01), Hirano
patent: 5390250 (1995-02-01), Janse et al.

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