| 摘要 |
PROBLEM TO BE SOLVED: To provide a digital signal encoding device capable of performing encoding with high fidelity adaptable to the signal characteristics and frequency band of digital data. SOLUTION: Band-dividing filters 30 and 31 divide digital data of a specified time length into data of respective sub-band frames. A block length determination portion 32 determines the block length when data of each sub-band frame are orthogonally converted. The block length determination portion 32 determines the block length based upon a coefficient corresponding to signal characteristics of each sub-band frame and the band of each sub-band frame. A quantization bit number calculation portion 39 allocates the number of bits based upon audiopsychological characteristics to digital data after orthogonal conversion with the determined block length, a quantization portion 40 quantizes the data, and a packing portion 41 encodes the data. COPYRIGHT: (C)2006,JPO&NCIPI
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