A method and an apparatus provide extraction of data from an analog signal. The method includes deriving a data-location signal having amplitude transitions that identify a phase of amplitude transitions of the analog signal, and, in response to the data-location signal, selecting a sampling clock signal...http://www.google.com.tw/patents/US7421049?utm_source=gb-gplus-share專利 US7421049 - Apparatus and method for automated determination of sampling phase of an analog video signal
