Patent ID: 8537223

Claim:
A method of identifying digital television transmissions, comprising: for each of a plurality of digital television field sync time periods: determining, for a first window of data representing a signal received over a first portion of the field sync time period, a first non-coherent correlation power measure based on a correlation of the first window of data to a reference digital television field sync signal; storing data representing the first non-coherent power measure in a delay register to create a delayed data sample; determining, for a second window of data representing a signal received over a second portion of the field sync time period, a second non-coherent correlation power measure based on a correlation of the second window of data to the reference digital television field sync signal; and combining data representing the second non-coherent correlation power measure with the delayed data sample to create combined power data; and determining, based on the combined power data, that one of the digital television field sync periods includes a field sync signal.