Patent ID: 8238382

Claim:
A method of reproducing an information signal, comprising the steps of: reproducing an audio-visual multiplexing-resultant signal generated by multiplexing (1) a compressively-encoding-resultant video signal resulting from compressively encoding a video signal, (2) a first compressively-encoding-resultant audio signal resulting from compressively encoding a first audio signal having a synchronized relation with the video signal, (3) a reference clock information signal relating to synchronization between the compressively-encoding-resultant video signal and the first compressively-encoding-resultant audio signal, and (4) an indication timing information signal based on the reference clock information signal; reproducing the video signal from the reproduced audio-visual multiplexing-resultant signal; reproducing a substitution playback audio signal to reproduce a second audio signal, the substitution playback audio signal being generated in a signal generation side by (1) compressively encoding the second audio signal to get a second compressively-encoding-resultant audio signal, and (2) adding a sound-production-timing information signal to the second compressively-encoding-resultant audio signal, the sound-production-timing information signal designating a sound production timing of the second compressively-encoding-resultant audio signal, wherein a play list is generated from the audio-visual multiplexing-resultant signal and is linked with the substitution playback audio signal in the signal generation side; deriving the reference clock information signal and the indication timing information signal from the reproduced audio-visual multiplexing-resultant signal; deriving the compressively-encoding-resultant video signal from the reproduced audio-visual multiplexing-resultant signal; decoding the derived compressively-encoding-resultant video signal to get a decoding-resultant video signal; supplying the decoding-resultant video signal as an output video signal in response to the derived reference clock information signal and the derived indication timing information signal; deriving the sound-production-timing information signal and the second audio signal from the reproduced substitution playback audio signal; supplying the derived second audio signal instead of audio data in the reproduced audio-visual multiplexing-resultant signal as an output audio signal in response to the derived reference clock information signal and the derived sound-production-timing information signal; comparing the reference clock information signal and the indication timing information signal to get a comparison result; and supplying the video signal as an indication-purpose signal in accordance with the comparison result.