Echo canceller dynamic range extension

Details Echo canceller dynamic range extension Echo canceller dynamic range extension

H - Electricity

04

M

379/64

H04M 3/18 (2006.01) H04B 3/23 (2006.01)

Patent

CA 1213088

ECHO CANCELLER DYNAMIC RANGE EXTENSION by DOUGLAS MACPHERSON BRADY ABSTRACT OF THE DISCLOSURE Echo cancellers provide echo return loss enhancement by sub- tracting a replica of the echo signal from the echo returned via the two-wire to four-wire transition. The echo replica is derived from the signal incoming from the far end by signal processing which consists of a convolution and adaptive modeling that is used to model echo paths caused by the imperfections of the two-wire to four-wire transition. An improved echo return loss enhancement (ERLE) is obtained by dynamic range compression of the incoming signal prior to processing and dynamic range extension following processing. The range extension is slaved to a control signal from the range compressor, providing proper compensation for the compressed signal, but insuring that processing noise and other extraneous signals have been adversely treated.

452534

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