Patent ID: 7933322

Claim:
A timing lock detection apparatus in a digital broadcasting receiver, comprising: a discrete value generating means for cyclically selecting a discrete signal value from a continuous timing error signal inputted from a loop filter of a symbol timing recovery unit; a differential calculating means for generating a timing jitter signal by obtaining a difference between the discrete signal value from the discrete value generating means and a previously selected timing error signal; a sign variation detection means for detecting variation in a sign of the timing jitter signal; a lock control signal generating means for discriminating a period based on the detected variation of the sign of the timing jitter signal from the sign variation detection means, and controlling a lock step of the loop filter according to a convergence mode of the timing jitter signal at each period; and a lock detection signal generating means for generating a lock signal or an unlock signal according to whether the timing jitter signal reaches a steady state or not and using the lock step.