Patent ID: 8019197

Claim:
A recording/reproduction device for an information recording medium on which video data and audio data are recorded independently of each other, wherein on the information recording medium, in a separate area from a main sequence in which data blocks including original audio data and video data are recorded in succession, an additional sequence in which data blocks including post-record audio data are recorded in succession is formed, the recording/reproduction device comprising: a pick-up for recording or reproducing information onto/from the information recording medium, and a control portion for controlling an operation of the pick-up, wherein during reproduction from the information recording medium, the control portion controls an operation of the pick-up in the following order of (1) to (4), when M (M is an integer of 2 or larger) data blocks in the main sequence and M data blocks in the additional sequence, corresponding to each other in a real-time, are read out from the main sequence and the additional sequence, respectively, (1) from a head data block of the M data blocks in the main sequence, only original audio data of the head data block are read out with video data of the head data block not read out, (2) post-record audio data are read out in succession from the M data blocks in the additional sequence that correspond to the M data blocks in the main sequence, (3) video data are read out from the head data block of the main sequence, and (4) original audio data and video data are read out from remaining (M−1) data blocks in the main sequence.