Patent ID: 7212248

Claim:
A method of synchronizing audio and video portions of a media program signal, comprising the steps of: detecting an audio event in the audio portion of the media program signal; measuring a timing interval from the audio event to a subsequent video synchronization pulse in the video portion of the media program signal; and storing the timing interval in a third portion of the media program signal; wherein the audio event comprises a start of sentence, and the step of detecting the audio event comprises the steps of: determining a silence interval Δt silence during which an amplitude of the audio portion of the media program signal remains below a silence threshold T silence for a minimum silence interval time period min Δt silence ; and identifying the start of sentence as a time after the silence interval Δt silence and in which the audio portion of the media program signal rises from below the silence threshold T silence to above a syllable threshold T syllable within a syllable rise time Δt syllable .