发明名称 |
Audio subband coder with differentially encoded scale factors |
摘要 |
<p>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. <IMAGE></p> |
申请公布号 |
EP1085502(A2) |
申请公布日期 |
2001.03.21 |
申请号 |
EP20000119995 |
申请日期 |
2000.09.14 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
TANIGUCHI, SHOHEI;BANBA, YUTAKA |
分类号 |
H03M7/30;G10L19/00;G10L19/02;H03M7/40;(IPC1-7):G10L19/02 |
主分类号 |
H03M7/30 |
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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