Synchronization signal adjustment device, synchronization signal adjustment method, image display device, and synchronization signal generation device

Abstract

A receiver receives a stream of program data that includes: an image signal including a plurality of frames; a sound signal; and a playback timing signal used for synchronized playback of the image signal and the sound signal. A clock signal generation unit generates a clock signal that is independent of the playback timing signal. A reception timing signal acquisition unit acquires a reception timing signal indicating a receiving time of the program data. An analysis unit analyzes a trend of time-dependent variation in a detected difference between the reception timing signal and the playback timing signal. An adjustment amount generation unit generates an adjustment amount of the clock signal, which causes the difference between the reception timing signal and the playback timing to be constant, by referring to a trend of time-dependent variation analyzed by the analysis unit.