Recording medium and audio-signal processing apparatus

1. An optical audio disc having an area storing an audio audio title set (ATS), the audio title set (ATS) including data representing a digital audio signal resulting from steps including (1) quantizing a first original audio signal at a first sampling frequency (fs 1 ), and (2) quantizing a second original audio signal at a second sampling frequency (fs 2 ), the first original audio signal being in a first channel group having multiple channels, the second original audio signal being in a second channel group having multiple channels, the first sampling frequency (fs 1 ) being assigned to each of the channels in the first channel group, the second sampling frequency (fs 2 ) being assigned to each of the channels in the second channel group;

the audio title set (ATS) including data representing the first sampling frequency (fs 1 ) and the second sampling frequency (fs 2 ), and channel assignment information for identifying the channels in the first channel group and the channels in the second channel group; and

the area also storing an audio manager (AMG) containing data for controlling the digital audio signals and the data for displaying menu of the digital audio signals.

2. A digital signal recording disc as recited in claim 1 , wherein the quantization bit numbers of the first and second original audio signals are different from each other.

3. An optical audio disc as recited in claim 2 , wherein the first sampling frequency of the first original audio signals is different from the second sampling frequency of the second original audio signals.

4. A method of recording data to or reproducing data from the optical audio disc of claim 1 .

5. A digital signal recording disc comprising:

a first area 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;

a second area(ATSI) storing information of first and second parameters respectively relating to the first and second channel 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;

sampling frequencies of the first and second channel group digital audio signals;

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; and

a third area (AMG) containing data for controlling the digital audio signals and the data for displaying menu of the digital audio signals.