Patent ID: 6882373
Filing Date: 2005-04-19
Classification: H04L,H04N

Abstract:
1. A digital demodulating device in a digital TV receiver comprising: a digital signal processor digitizing pass band signals of a particular channel transmitted in a VSB modulation mode; a base band demodulator multiplying the pass band digital signals by a complex sinusoidal wave with a recovered carrier wave to convert the pass band digital signals to base band digital signals; a carrier wave recovery portion detecting phase error of a carrier wave from base band pilot signals output from the base band demodulator, generating a complex sinusoidal wave relative to the phase error, and outputting the complex sinusoidal wave to the base band demodulator; a resampler interpolating a timing error of current symbols to reduce an error between the base band digital signals output from the base band demodulator; a matched filter filtering the output of the resampler to maximize a signal-to-noise ratio (SNR) at a symbol position; a timing recovery portion obtaining a timing error of the current symbols from an output signal of the matched filter and feeding back the timing error to the resampler; and a channel equalizer compensating channel distortion included in the output signal of the matched filter.