Channel equalizer for a HDTV using a composite filter

Abstract

A channel equalization system of a VSB transmission system for a HDTV which can correct phase errors by using composite filters as well as by using general data even in a period having no training sequence. The channel equalizer for a HDTV includes, a composite filter part for making the input signal applied from outside produced as a I signal and a Q signal, filtering the I signal and the Q signal according to composite filter coefficients, and transmitting the filtered I and Q signals as first and second output signals. A composite filter restoring part for calculating an error for the training sequence and an error for the general data using a synchronization signal received from outside of the channel equalizer, the first and second output signals, and calculating real composite filter coefficients and imaginary composite filter coefficients based on the errors for the I signal and the Q signal produced at the composite filter part and training sequence and the error for general data and transmitting the calculated errors to the composite filter part.

Dependencies are inferred from the claim text.