Patent
1975-10-23
1977-05-03
Cooper, William C.
H04B 320
Patent
active
040216233
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 response 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 or digital implementation can be used.
REFERENCES:
patent: 3789165 (1974-01-01), Campanella et al.
patent: 3836734 (1974-09-01), Campanella et al.
patent: 3894200 (1975-07-01), Campanella et al.
Kauffman Eric R.
Onufry, Jr. Michael
Suyderhoud Henri G.
Communications Satellite Corporation (Comsat)
Cooper William C.
Myers Randall P.
LandOfFree
Automatic H-register clear for prevention of erroneous convoluti does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Automatic H-register clear for prevention of erroneous convoluti, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic H-register clear for prevention of erroneous convoluti will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-346995