Multiple echo cancellation using a fixed filter delay

Details Multiple echo cancellation using a fixed filter delay Multiple echo cancellation using a fixed filter delay

2011-01-25

2011-01-25

Jamal, Alexander (Department: 2614)

Telephonic communications

Echo cancellation or suppression

Disable or inhibit function

Reexamination Certificate

active

07876892

ABSTRACT:
There is provided a method for use by an echo canceller to cancel a far echo at a variable delay and a near echo at a fixed delay. The method comprises constructing an echo signal model based on an incoming signal, determining a variable echo delay for a far echo caused by a far echo source, determining a fixed echo delay for a near echo caused by a near echo source, subtracting the echo signal model from an outgoing signal at a window placed around the variable echo delay to cancel far echo, e.g. when the echo canceller determines existence of the far echo, and subtracting the echo signal model from the outgoing signal at a window placed around the fixed echo delay to cancel near echo, e.g. regardless of existence of the near echo, wherein the fixed echo delay is smaller than the variable echo delay.

REFERENCES:
patent: 5400394 (1995-03-01), Raman et al.

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