| 摘要 |
The recording area of a recording medium is separated into a first region and a second region. The basic information among plural channels is recorded in the first region and the remaining subsidiary information is recorded in the second region. As the basic information, digital audio signals of at least the left, center, right, surround left, surround right and sub-woofer channels are recorded. As the subsidiary information, digital audio signals of at least the left center channel, right center channel, delayed center channel, mixed left channel and mixed right channel are recorded. If the information recorded in one of the regions is lost, it is reproduced using the information of the other region during subsequent reproduction. In addition, the digital audio signals of six channels (L, LC, C, SW, RC and R) among the digital audio signals of the eight channels (L, LC, C, SW, RC, R, LB and RB), which digital audio signals of the six channels are psychoacoustically more crucial than those of the remaining two channels, are compression encoded with a higher audibility conforming to the human acoustic sense, while the digital audio signals of the two channels (LB, RB) are encoded with a higher compression ratio. In this manner, compression encoding with higher sound quality may be achieved for the crucial sound, while avoiding the wasteful bit allocation (wasteful byte allocation quantity). <IMAGE> |
