Patent ID: 8270269

Claim:
A timing extraction device in an information reproduction device for extracting data and recording timing of the data from a received signal, comprising: an asynchronous clock generator for generating an asynchronous clock which is asynchronous with data recording timing of the received signal; an A/D converter for converting the received signal which is an analog signal into a digital signal based on the asynchronous clock of the asynchronous clock generator; an asynchronous timing detector for measuring an appearance interval of a specific pattern included in the digital signal from the A/D converter based on the asynchronous clock of the asynchronous clock generator, and outputting the measured value which is the number of clock pulses of the asynchronous clock; a phase controller for receiving the digital signal from the A/D converter and calculating a phase error between the digital signal and the asynchronous clock generated by the asynchronous clock generator; and a pseudo-synchronous clock generator for thinning the asynchronous clock of the asynchronous clock generator based on the specific pattern appearance interval measured by the asynchronous timing detector and the phase error calculated by the phase controller to generate a pseudo-synchronous clock which is pseudo-synchronous with the data recording timing.