Parametric compression/decompression modes for quantization matrices for digital audio
US7143030B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 17, 2005 |
| Grant date | Nov 28, 2006 |
| Priority date | — |
| Expiry date | Mar 18, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/0204
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Quantization matrices facilitate digital audio encoding and decoding. An audio encoder generates and compresses quantization matrices; an audio decoder decompresses and applies the quantization matrices. For example, the audio encoder generates a quantization matrix including weighting factors and processes a set of weighting factors according to a parametric model to switch between a direct representation and a parametric representation of the set of weighting factors, where the parametric representation of the set of weighting factors accounts for audibility of distortion according to a model of human auditory perception. In another example, an audio encoder receives a band weight representation of a ciuantization matrix and compresses the band weight representation of the quantization matrix using linear predictive coding, wherein the compressing includes computing pseudo-autocorrelation values for the quantization matrix. For example, a matrix includes weights for bands of a group of frequency coefficients.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.