发明名称 |
Method and apparatus for sub-band coding and decoding |
摘要 |
An input digital audio signal is divided into sub-band signals in respective sub-bands. Scale factors of the respective sub-bands are determined on the basis of the sub-band signals for every frame. Calculation is made as to differences between the determined scale factors for a first frame and the determined scale factors for a second frame preceding the first frame. Absolute values of the calculated scale-factor differences are calculated, and data representative of the calculated absolute values are generated. The data representative of the calculated absolute values are encoded into data of a Huffman code. Sign bits are generated which represent signs of the calculated scale-factor differences. The sub-band signals are quantized in response to the determined scale factors for every frame to generate quantized samples of the sub-band signals. The Huffman-code data, the generated sign bits, and the quantized samples of the sub-band signals are combined into a bit stream.
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申请公布号 |
US6625574(B1) |
申请公布日期 |
2003.09.23 |
申请号 |
US20000645326 |
申请日期 |
2000.08.25 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL., LTD. |
发明人 |
TANIGUCHI SHOHEI;BANBA YUTAKA |
分类号 |
G10L19/00;G10L19/02;H03M7/30;H03M7/40;(IPC1-7):G10L19/02;G10L11/00;G10L19/14 |
主分类号 |
G10L19/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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