H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 7/50 (2006.01) H04N 7/015 (2006.01) H04N 7/28 (2006.01) H04N 7/32 (2006.01)
Patent
CA 2055072
In a differential PCM encoder, the problem of error perpetuation is solved by leaking a changing, rather than a fixed, fraction of the input signal to the differential PCM. The fraction leaked is sensitive to the characteristics of the signal. In one embodiment the fraction leaked is fixed for a frame in accordance with a chosen characteristic of the frame signal. In another embodiment, the fraction leaked is set in accordance with one function when a chosen characteristic of the frame signal exceeds a given level, and follows another function when the chosencharacteristic does not exceed the chosen level. In a still another embodiment, the fraction leaked is set to one of two levels, based on a chosen characteristic of the frame signal.
Johnston James David
Knauer Scott Carroll
Matthews Kim Nigel
Netravali Arun Narayan
Petajan Eric David
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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