Quality and rate control strategy for digital audio
US7027982B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 2001 |
| Grant date | Apr 11, 2006 |
| Priority date | — |
| Expiry date | Sep 2, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/002
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An audio encoder regulates quality and bitrate with a control strategy. The strategy includes several features. First, an encoder regulates quantization using quality, minimum bit count, and maximum bit count parameters. Second, an encoder regulates quantization using a noise measure that indicates reliability of a complexity measure. Third, an encoder normalizes a control parameter value according to block size for a variable-size block. Fourth, an encoder uses a bit-count control loop de-linked from a quality control loop. Fifth, an encoder addresses non-monotonicity of quality measurement as a function of quantization level when selecting a quantization level. Sixth, an encoder uses particular interpolation rules to find a quantization level in a quality or bit-count control loop. Seventh, an encoder filters a control parameter value to smooth quality. Eighth, an encoder corrects model bias by adjusting a control parameter value in view of current buffer fullness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.