Patent ID: 7289168

Claim:
A video and audio processing apparatus, comprising: a switch which selects one of a first audio signal superposed on a video signal and a second audio signal received other than the first audio signal; an information display circuit which displays information on a screen; and a control circuit which controls the switch and the information display circuit, wherein the control circuit selects the first audio signal when the first audio signal is superposed on the video signal, controls the switch to select the second audio signal when the first audio signal is not superposed on the video signal, and controls the switch to select the second audio signal when the first audio signal is superposed on the video signal and an error rate of the first audio signal is higher than a predetermined threshold value, and wherein the error rate of the first audio signal is determined by using an error rate of the video signal, an error correction function of the first audio signal, or copy control information added to the video signal.