| 摘要 |
PROBLEM TO BE SOLVED: To provide an encoding rule conversion method and device for converting the encoding rule of data which are encoded with a first encoding rule, to a second encoding rule in a short period of time, without degradation in the quality. SOLUTION: In the encoding rule conversion method of the encoded data, a quantization scale calculating section 300 calculates an AAC(advanced audio coding) scale value Q' from an MP3 quantization scale value Q, on the basis of a primary function indicating correlation of the MP3 quantization scale value and the AAC quantization scale value. A quantization section 311 quantizes MDCT (modified discrete cosine transform) coefficient, on the basis of the AAC quantization scale value Q', which is calculated in the quantization scale calculating section 300. Consequently, repeated processings for determining the quantization scale value are not performed in the AAC encoding process. COPYRIGHT: (C)2008,JPO&INPIT
|
