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Abstract

Broadcast DTV signals are improved by including in each of their successive data fields a training signal for the adaptive channel-equalization and echo-cancellation filtering in receivers. The training signal in each data field includes a prescribed number of cycles of a particular pseudo-random noise sequence extending over a plurality of data segments to provide a training signal for the adaptive filtering that is of longer duration than one of said data segments. Each data segment in each data field begins with a data segment synchronizing sequence, and the training signals incorporate some of these data segment synchronizing sequences within themselves. Receivers are described that initialize the parameters of the adaptive filtering using discrete Fourier transform calculations on the training signal, and receivers are described that initialize the parameters of the adaptive filtering using the results of match filtering for the particular pseudo-random noise sequence.

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