Patent ID: 6300984
Filing Date: 2001-10-09
Classification: H04L,H04N

Abstract:
An electrical signal received by a television signal receiver, which is of a type for receiving digital television signals and has adaptive channel equalization and ghost cancellation filter circuitry that can be trained responsive to composite ghost cancellation reference signals, said electrical signal divided into segments having respective initial synchronizing signal portions, said segments being grouped into fields, most of the segments of each field being available for transmitting television information, with at least one reference-signal segment of each field transmitting one of said composite ghost cancellation reference signals in a final portion thereof, each reference-signal segment including a respective first pseudo-random noise sequence at the beginning of said final portion thereof followed after an intervening time interval by a respective second pseudo-random noise sequence before the finish of said final portion thereof, said composite ghost cancellation reference signal transmitted in each reference-signal segment comprising said respective first and second pseudo-random noise sequences.