Patent ID: 8107505

Claim:
An apparatus for reproducing an information signal, comprising: means for reproducing an audio-visual multiplexing-resultant signal generated by multiplexing 1) a compressively-encoding-resultant video signal which results from compressively encoding a video signal, 2) a first compressively-encoding-resultant audio signal which results 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; means for reproducing the video signal from the reproduced audio-visual multiplexing-resultant signal; means for 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; means for deriving the reference clock information signal and the indication timing information signal from the reproduced audio-visual multiplexing-resultant signal; means for deriving the compressively-encoding-resultant video signal from the reproduced audio-visual multiplexing-resultant signal; means for decoding the derived compressively-encoding-resultant video signal to get a decoding-resultant video signal; means for 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; means for deriving the sound-production-timing information signal and the second audio signal from the reproduced substitution playback audio signal; and means for 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.