Patent ID: 7254103

Claim:
A digital signal recording medium having an area storing an audio title set (ATS), the area also storing information for managing the audio title set (ATSI), the audio title set (ATS) including an audio pack, the audio pack including data representing a digital audio signal resulting from steps including (1) quantizing a first original audio signal at a first quantization word length and a first sampling frequency, (2) quantizing a second original audio signal into a quantization-resultant audio signal at a second quantization word length and a second sampling frequency, and (3) subjecting the quantization-resultant audio signal to a bit shift, 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 being assigned to each of the channels in the first channel group, the second sampling frequency being assigned to each of the channels in the second channel group, the bit shift having a quantity common to the channels in the second channel group; the information for managing the audio title set (ATSI) including data representing the first quantization word length and first sampling frequency and the second quantization word length and second sampling frequency, data representing the quantity of the bit shift and channel assignment information for identifying the channels in the first channel group and the channels in the second channel group; the audio pack including a private header, the private header including data representing the first quantization word length and first sampling frequency and the second quantization word length and second sampling frequency, data representing the quantity of the bit shift and channel assignment information for identifying the channels in the first channel group and the channels in the second channel group.