Automatic h-register clear for prevention of erroneous...

Details Automatic h-register clear for prevention of erroneous... Automatic h-register clear for prevention of erroneous...

H - Electricity

04

M

379/64, 328/0.1

H04M 1/74 (2006.01) H04B 3/20 (2006.01) H04B 3/23 (2006.01) H04B 7/185 (2006.01)

Patent

CA 1065514

ABSTRACT An automatic H-register clear system for the prevention of erroneous convolution in adaptive digital echo cancellers is disclosed. Incoming signals from the H- register are accumulated and compared to a predetermined threshold value and when the value is exceeded, the H- register is cleared with the occurrence of the internal housekeeping cycle of the echo canceller. The clearing of the H-register allows a new impulse responsive model to be generated from new sampled data. In one embodiment using analog implementation, the accumulation takes place using a sequence of signal processing of digital-to-analog conversion, full wave rectification followed by integration of the signal. In another preferred embodiment using a counter detection system, each word is compared to a threshold and if this value is exceeded, a counter is indexed. If the value of the count in the counter exceeds a predetermined number during the sampling interval, the H-register is cleared. In this latter embodiment, either analog digital implementation can be used.

262668

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