Recording medium and audio-signal processing apparatus

A digital signal recording disc comprising:

• a first area (ACBS) storing first and second channel digital audio signals of a plurality of channels of audio data, and storing left and right channel stereophonic digital audio signals, wherein said plurality of channels are divided into first and second channel groups, and the first channel digital audio signal included in the first channel group comprises a front channel digital audio signal and the second channel digital audio signal included in the second channel group comprises a rear channel digital audio signal, the first channel digital audio signal resulting from an analog-to-digital conversion of a first channel analog audio signal at a first sampling frequency and a first quantization bit number, the second channel digital audio signal resulting from an analog-to-digital conversion of a second channel analog audio signal at a second sampling frequency and a second quantization bit number, and the left and right channel stereophonic digital audio signals resulting from an analog-to-digital conversion of left and right channel stereophonic analog audio signals at a third sampling frequency and a third quantization bit number;
• and
• a second area differing from the first area and storing information of first and second parameters respectively relating to the first and second channel (ATSI) digital audio signals, the first parameter comprising at least one item selected from the group comprising:
• quantization bit numbers of the first and second group channel digital audio signals;
• and sampling frequencies of the first and second channel group digital audio signals, and the second parameter comprising assignment of the first and second channel digital audio signals to said first and second channel groups, and the third sampling frequency, and the third quantization bit number.