Quantization in perceptual audio coders with compensation for synthesis filter noise spreading
US6363338B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1999 |
| Grant date | Mar 26, 2002 |
| Priority date | — |
| Expiry date | Apr 12, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/0204
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
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 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.