Rate-distortion optimization for advanced audio coding
US8380524B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 26, 2009 |
| Grant date | Feb 19, 2013 |
| Priority date | — |
| Expiry date | Aug 13, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/0017
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for optimization of rate-distortion for Advanced Audio Coding (AAC). The method provides for the identification of quantized spectral coefficient sequences for optimization of rate-distortion. The method also provides joint optimization of scale factors, Huffman codebooks and quantized spectral coefficient sequences for minimization of a rate-distortion cost. The method provides an iterative rate-distortion optimization algorithm for AAC encoding. In each iteration, the method first finds the optimal scale factors and quantized spectral coefficients when Huffman codebooks are fixed, then updates Huffman codebooks and quantized spectral coefficients given the optimized scale factors. The iterations may be applied until a predetermined threshold is attained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.