After-recording apparatus

1. An after-recording apparatus comprising:

first means for compressively encoding an audio signal into encoding-resultant audio data divided in units;

second means for compressively encoding a video signal into encoding-resultant video data by using MPEG encoding method divided in units;

third means for adding an audio time stamp for audio-vide audio-video synchronous reproduction to every unit of the encoding-resultant audio data generated by the first means to generate time-stamp-added audio data;

fourth means for adding a video time stamp audio-video synchronous reproduction to every unit of the encoding-resultant video data generated by the second means to generate time-stamp-added video data;

fifth means for multiplexing the time-stamp-added audio data generated by the third means and the time-stamp-added video data generated by the fourth means into main data by using MPEG multiplexing method;

sixth means for, to first after-recording-purpose encoding-resultant data for at least one of encoding-resultant audio data generated by the first means and the encoding-resultant video data generated by the second means which form the main data, adding a time stamp for reproduction synchronous with a portion of the main data and identification information for identifying the after-recording-purpose encoding-resultant data to convert the encoding-resultant audio data in main data into after-recording-purpose encoding-resultant data; and

seventh means for recording the main data, the after-recording-purpose encoding-resultant data, and play list information on a recording medium, the play list information by number of play items providing link between the main data and the after-recording-purpose encoding-resultant data.

2. A reproducing apparatus for reproducing after-recording-purpose data and a portion of main data from a recording medium, the recording medium storing the main data, the after-recording-purpose data, and play list information which are recorded thereon in a procedure comprising the steps of compressively encoding an audio signal into encoding-resultant audio data divided in units; compressively encoding a video signal into encoding-resultant video data by using MPEG encoding method divided in units; adding an audio time stamp for audio-video synchronous reproduction to every unit of the encoding-resultant audio data to generate time-stamp-added audio data; adding a video time stamp for audio-video synchronous reproduction to every unit of the encoding-resultant video data to generate time-stamp-added video data; multiplexing the time-stamp-added audio data and the time-stamp-added video data into main data; recording the main data on the recording medium; adding, to first after-recording-purpose encoding-resultant data, a time stamp for reproduction synchronous with a portion of the main data by using MPEG system multiplexing method and identification information for identifying the first after-recording-purpose encoding-resultant data to convert the encoding-resultant audio data in main data into second after-recording-purpose encoding-resultant data; and recording the after-recording-purpose encoding-resultant data and play list information on the recording medium, the play list information providing link between the main data and the second after-recording-purpose encoding-resultant data, the reproducing apparatus comprising:

first means for reading out the play list information from the recording medium;

second means for reading out desired main data and desired after-recording-purpose encoding-resultant data from the recording medium in response to users request by referring to the read-out play list information;

third means for separating the read-out desired main data into desired main video data and desired main audio data; and

fourth means for synchronously reproducing contents of the desired main video data and contents of the desired after-recording-purpose encoding-resultant data in response to time stamps therein.

3. A recording medium storing non-transitory main data, after-recording-purpose data, and play list information which are recorded thereon in a procedure comprising the steps of:

compressively encoding an audio signal into encoding-resultant audio data divided in units;

compressively encoding a video signal into encoding-resultant video data by using MPEG encoding method divided in units;

adding an audio time stamp for audio-video synchronous reproduction to every unit of the encoding-resultant audio data to generate time-stamp-added audio data;

adding a video time stamp for audio-video synchronous reproduction to every unit of the encoding-resultant video data to generate time-stamp-added video data;

multiplexing the time-stamp-added audio data and the time-stamp-added video data into main data by using MPEG system multiplexing method;

adding to after-recording-purpose encoding-resultant data for at least one of the encoding-resultant audio data and the encoding-resultant video data which form the main data a time stamp for reproduction synchronous a portion of the main data and identification information for identifying the after-recording-purpose encoding-resultant data to convert into second after-recording-purpose encoding-resultant data; and

recording the main data, the after-recording-purpose encoding-resultant data, and play list information on a recording medium, the play list information providing link between the main data and the second after-recording-purpose encoding-resultant data.