Patent ID: 7269105

Claim:
An audio information reproducing method for reproducing audio from an optical disk, the optical disk being configured to store an audio object and management information configured to manage the audio object, the audio object including a plurality of packs each containing a packet, each of the plurality of packets having a pack header, a packet header, a private header, and a data section, audio signals of a plurality of channels stored in the plurality of packs being distributed into a first channel group and a second channel group, the audio signals of the first channel group being digitized into a first audio data string at a first sampling frequency in a first number of quantization bits, and the audio signals of the second channel group being digitized into a second audio data string at a second sampling frequency in a second number of quantization bits, the second sampling frequency being different from the first sampling frequency, the first audio data string and the second audio data string being arranged individually, and the management information including an audio title set information management table for reproducing the audio signals of the plurality of channels and a program chain information table, the audio title set information management table including allocation information, which indicates a state of each of the plurality of channels, wherein the state indicates whether each of the plurality of channels is allocated to a stereo channel or a surround channel, and at least one mix down coefficient table, the at least one mix down coefficient table describing a mixing coefficient for mixing each of the plurality of channels when the plurality of channels are reproduced, the packet header describing copyright information and information indicating whether data of the packet is an original or a copy, and the private header including an International Standard Recording Code (ISRC) number used for still picture control and ISRC data, the audio information method comprising: reading the management information from the optical disk; and reproducing the audio object based on the management information read from the optical disk.