Suppression of echo signals and the like

Details Suppression of echo signals and the like Suppression of echo signals and the like

2006-06-13

2006-06-13

Harold, Jefferey F. (Department: 2646)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S406010, C379S406080, C379S406150

Reexamination Certificate

active

07062040

ABSTRACT:
In a microphone signal, the signal component corresponding to, e.g., echo is suppressed using an echo control scheme that estimates the spectral envelope of the echo signal, without having to estimate the waveform for the echo signal. In one embodiment, the input signal (to be applied to a loudspeaker) and the microphone signal are spectrally decomposed into multiple subbands, where echo suppression processing is independently performed on each subband. The echo control of the present invention can be implemented with substantially reduced (1) computational complexity and (2) phase sensitivity, as compared to traditional acoustic echo cancellation, in which the waveform for the echo signal is estimated.

REFERENCES:
patent: 4956838 (1990-09-01), Gilloire et al.
patent: 5933495 (1999-08-01), Oh
patent: 6580795 (2003-06-01), Li et al.
patent: 6751313 (2004-06-01), Zad Issa
patent: 6757385 (2004-06-01), Ehrenstr.ang.le et al.

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