发明名称 |
Quantization in perceptual audio coders with compensation for synthesis filter noise spreading |
摘要 |
Many perceptual split-band coding systems that use analysis and synthesis filters assume the quantization noise introduced by quantizing split-band signals is substantially the same as the noise that results in the output signal obtained by applying the synthesis filters to the quantized split-band signals. In general, this assumption is not true because the synthesis filters modify or spread the quantization noise. A theoretical framework for deriving an optimum bit allocation that accounts for synthesis-filter noise spreading and the overlap-add process is disclosed. In concept, the problem of finding an optimal bit allocation can be expressed as a linear optimization problem in a multidimensional coordinate space. Simplified processes derived from this theoretical framework are disclosed that can obtain near-optimal solutions using modest computational resources. |
申请公布号 |
AU4338200(A) |
申请公布日期 |
2000.11.14 |
申请号 |
AU20000043382 |
申请日期 |
2000.04.10 |
申请人 |
DOLBY LABORATORIES LICENSING CORPORATION |
发明人 |
ANIL WAMANRAO UBALE;GRANT ALLEN DAVIDSON |
分类号 |
G10L19/00;G10L19/02;H03M7/30 |
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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