| 摘要 |
PROBLEM TO BE SOLVED: To provide the lossless audio coding/decoding method and apparatus which can provide a compression ratio better than that of BPGC. SOLUTION: The coding method includes a step, in which the audio spectrum signal in the frequency domain having an integral value is mapped into a bit-plane signal with respect to the frequency; a step in which a MSB and a Golomb parameter are obtained for each bit-plane, a step in which a binary sample on a bit-plane to be coded, in the order starting from the MSB to a LSB and from a low frequency to a high frequency is selected; a step in which the context of the selected binary sample is calculated by using significances of already coded bit-planes for each of a plurality of frequency lines existing in the vicinity of a frequency line, to which the selected binary sample belongs; a step in which a probability model is selected by using the obtained Golomb parameter and the calculated contexts; and a step in which a lossless-coding of the binary sample is performed, by using the selected probability model. COPYRIGHT: (C)2005,JPO&NCIPI
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