Synchronization signal detection in a digital television receiver

A method of generating sync signals in a digital television receiver, comprising:

• demodulating television signals and outputting equalizer training signals in the form of real (I) and imaginary (Q) data;
• detecting a sync signal by:
• correlating the I and Q data;
• calculating the sum of the power of the correlated I and Q data;
• comparing the sum against a preset threshold and outputting a compare indication signal;
• monitoring the compare indication signal and outputting a lock control signal;
• and
• calculating a phase of the equalizer training signals based on the I and Q data and outputting a phase offset signal based on the compare indication signal;
• and
• adjusting the phase of the I and Q data based on the phase offset signal and outputting phase adjusted I data under control of the lock control signal.

A sync signal detector, comprising:

• a correlator that correlates equalizer training signals including I and Q data;
• a power calculator that calculates the sum of the power of the correlated I and Q data;
• a comparator that compares the sum against a preset threshold and outputs a compare indication signal;
• a sync lock controller that monitors the compare indication signal and outputs a lock control signal;
• a phase calculator that calculates a phase of the equalizer training signals based on the I and Q data and outputs a phase offset signal based on the compare indication signal;
• and
• a sync signal generator that generates sync signals for use in synchronizing television signals under control of the lock control signal.