Patent ID: 8339517

Claim:
A television broadcast receiving apparatus, comprising: a tuning unit converting an inputted television broadcast signal into an intermediate frequency signal; and a demodulating unit demodulating said intermediate frequency signal, said demodulating unit including: a phase synchronization loop part synchronizing a phase of said intermediate frequency signal with a phase of an internally generated carrier signal, outputting a synchronization flag signal when said intermediate frequency signal and said carrier signal are in a synchronized state, and outputting an out-of-synchronization flag signal when said intermediate frequency signal and said carrier signal are in an unsynchronized state; a video detecting part demodulating said intermediate frequency signal outputted from said phase synchronization loop part into a video signal; and a sound detecting part demodulating said intermediate frequency signal outputted from said phase synchronization loop part into an audio signal when said synchronization flag signal is outputted from said phase synchronization loop part, and outputting a noise signal of a predetermined level instead of said audio signal when said out-of-synchronization flag signal is outputted from said phase synchronization loop part.