| 摘要 |
PROBLEM TO BE SOLVED: To decrease the encoding quantity in a high frequency band and to perform more efficient encoding by handling frequency bands together as one bundled band and omitting the recording of a mantissa as to the bundled band. SOLUTION: Block data of respective audio blocks are formed of digital data on the frequency axis for each prescribed period obtained by the MDCT. The obtained frequency data obtain a signal indicating the intensity by 1000 fine bands having specific intervals. In this case, intensity signals in respective bands are handled together by approximately 3 to 12 bands in order to reduce the data amount while preventing deterioration of sound quality as to high frequencies at which auditory influence is small. Namely, bands of high frequency are bundled and handled together. Then audio blocks are reused and reproduced to expand a recording and reproduction time per frame. |
