Masking is provided for any block of a transmitted digital signal which includes error signals caused by noise in the transmission channel. The digital signal may be an analog signal which has been digitized. When an erroneous block is detected, a masking signal is developed which is substituted for...http://www.google.fr/patents/US4829523?utm_source=gb-gplus-shareBrevet US4829523 - Error masking in digital signal transmission
