Method of detecting a double talk situation for a...

Details Method of detecting a double talk situation for a... Method of detecting a double talk situation for a...

2010-06-02

2011-11-22

Chang, Kent (Department: 2617)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S569200, C379S388010, C379S406050, C379S406010, C379S387010, C348S611000, C348S607000

Reexamination Certificate

active

08064966

ABSTRACT:
The device comprises a microphone for detecting a speech signal from a near speaker, and a loudspeaker for reproducing a speech signal from a remote speaker. The processing for canceling the interfering acoustic echo implements an adaptive linear filtering algorithm. Double talk situations are detected by: evaluating an index representative of the convergence or divergence of the algorithm; assessing a predetermined condition for detecting a double talk situation; and if the condition is satisfied, modifying at least one parameter of the algorithm in response to the detection. The representative index may be the norm of the gradient vector describing the adaptation of the filter from one iteration of the algorithm to the next, the conditions being a comparison between the gradient and a threshold. The parameter that is modified double talk situation may be the adaptation stepsize of the algorithm, and also the gain control of an echo suppression stage.

REFERENCES:
patent: 6795550 (2004-09-01), Chen
patent: 2002/0154761 (2002-10-01), McLaughlin et al.
patent: 2003/0007633 (2003-01-01), Tucker et al.
patent: 2004/0052358 (2004-03-01), Lashley et al.
patent: 2005/0286714 (2005-12-01), Tokuda
patent: 2008/0101622 (2008-05-01), Sugiyama

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