Patent ID: 7257135

Claim:
A method of generating an information signal to be recorded, comprising the steps of: 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 and designating an indication timing of the video signal to get an AV (Audio Visual) multiplexing-resultant signal; generating a second audio signal; compressively encoding the second audio signal to get a second compressively-encoding-resultant audio signal; and adding a sound-production-timing information signal to the second compressively-encoding-resultant audio signal to get a substitution playback audio signal which can be reproduced instead of the first audio signal while being synchronous with the video signal during playback, the sound-production-timing information signal being based on the reference clock information signal and relating to synchronization with the video signal.