Patent ID: 7333576

Claim:
A digital demodulation device comprising: a synchronization detector for detecting a sync signal included in a received signal and outputting a sync timing signal indicating the timing of the sync signal, the sync signal being composed of a plurality of symbols; a waveform equalizer having a transversal filter for performing waveform equalization of the received signal by updating coefficients of taps of the transversal filter regarding the timing of the sync timing signal as the position of a center tap; and a controller for receiving at least one of the coefficients of the taps and determining, based on the coefficient of the tap, whether or not the synchronization detector has made a synchronization error such that the synchronization detector captures a sync signal included in a delayed signal, the sync signal being composed of the plurality of symbols, wherein the controller instructs the synchronization detector to re-detect a sync signal when determining that the synchronization detector has made the synchronization error, and the synchronization detector re-detects a sync signal in response to the instruction from the controller.