A reproduction apparatus has ASL function to select one of the two kinds of audio data based on PGC Block.

• Two kinds of audio data (AOBs) shall be encoded with the same audio contents, and are different in the number of channels and/or audio coding mode.
• AOBs are defined as PGC Block of two PGCs. Each PGC Block has attributes "Block mode," "Block type," and "Audio attribute."

[References]

• PART4 7.1.2.2/AU7-20
  PART4 Aucio Selection 2.4/AU2-12

[Offering Patent]

• USP 6,222,805