Patent ID: 6757024
Filing Date: 2004-06-29
Classification: H04N

Abstract:
A timing recovery apparatus for a digital TV, the apparatus comprising:a symbol synchronization unit for determining the bandwidth of a timing recovery loop in a plurality of steps according to a convergence degree to output a sampling frequency upon receipt of a baseband signal; and a timing lock detector for detecting the convergence state of the symbol synchronization unit and detecting a lock by using a reference value calculated by the envelope of a timing error; wherein the timing lock detector comprises: a reference generator for taking an absolute value for a timing error generated by each symbol, detecting a maximum value for an integration interval, and outputting a reference value two times larger than a gain; an interval integrator for integrating the timing error; a lock/unlock count signal generator for generating a lock or unlock count signal by comparing the reference value outputted from the reference generator; and a confidence counter for counting each threshold level upon receipt of the lock or unlock count signal, outputting the lock or unlock count signal, and resetting them.