Double-talk detection

Details Double-talk detection Double-talk detection

2008-09-25

2011-10-18

Briney, III, Walter F (Department: 2614)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C370S286000

Reexamination Certificate

active

08041028

ABSTRACT:
Within audio telecommunications for audio-visual conferencing a means of reliable double-talk detection is required for several reasons, including control of residual echo, and control of adaptive algorithms used to estimate the echo. Existing techniques tend to either fail when echo return loss is very low or require highly complex algorithms to increase the range of detecting whether double-talk is occurring. The invention is based upon a new method of estimating the power envelope of the double-talk signal. This estimation is then employed in conjunction with a slightly modified version of an echo return loss enhancement (ERLE) based statistic, to form a double-talk decision based on a combination of the two statistics. The resulting decision rule works for both low-ERLE and high-ERLE situations, which is useful when there can be large variations in the magnitude of the echo path seen by the algorithms, or where near-end noise prevents the achievement of high ERLE.

REFERENCES:
patent: 2002/0041678 (2002-04-01), Basburg-Ertem et al.

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