Patent ID: 7706312

Claim:
An apparatus to generate a synchronized sub-carrier signal based on a pilot signal, the apparatus comprising: a zero-crossing detector, responsive to said pilot signal, for detecting a pilot signal zero-crossing based on said pilot signal; a sub-carrier signal phase sampler, responsive to said zero-crossing detector, for generating a sequence of sub-carrier signal phase samples at a sampling frequency, said sequence of sub-carrier signal phase samples comprising a first sub-carrier signal phase sample and additional sub-carrier signal phase samples at predetermined phase sample intervals; a phase sample counter for counting said phase samples generated by said sub-carrier signal phase sampler; a sub-carrier signal generator, responsive to said sub-carrier signal phase samples, for generating said synchronized sub-carrier signal; and a post-zero-crossing sub-carrier phase computation circuit, responsive to said zero-crossing detector, said sub-carrier signal phase sampler, and said phase sample counter, for outputting to said sub-carrier signal phase sampler an expected phase of a post-zero-crossing pilot signal phase sample in response to a premature pilot signal zero-crossing and an adjusted post-zero-crossing sub-carrier signal phase sample in response to said detected pilot signal zero-crossing.