| 摘要 |
PROBLEM TO BE SOLVED: To improve auditory quality by correcting discrepancy in power before encoding and after the encoding. SOLUTION: In an audio signal encoding device 1, a scale factor adjustment section 15 compares mean energy of spectrum coefficients by sub-bands of a normalized spectrum signal after normalization and before quantization with mean energy of spectrum coefficients by the sub-bands of a quantized spectrum signal after the quantization and adjusts a scale factor of a sub-band so that the energy of the sub-band after quantization approximates the energy after the normalization and before the quantization when there is discrepancy between the both, for example, the energy of the sub-band after the quantization decreases. Further, the scale factor adjustment section 15 determines whether the scale factor can be adjusted or an adjustment quantity of the scale factor etc., according to the sub-band position and local spectrum characteristics (for example, tonality). COPYRIGHT: (C)2006,JPO&NCIPI
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