Patent · US Active

Prediction of spectral coefficients in waveform coding and decoding

US7684981B2 · kind B2 · utility

34Cited by

138References

18Claims

0Family size

Assignee

Microsoft Corporation · US

Inventors

Naveen Thumpudi · Redmond, US
Wei-Ge Chen · Beijing, CN
Chao He · Tayport, GB

Key dates

Filing date	Jul 15, 2005
Grant date	Mar 23, 2010
Priority date	—
Expiry date	Sep 1, 2028

Classification

Technology area (CPC G)Physics
CPC primaryG10L19/0017
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

Techniques and tools for prediction of spectral coefficients in encoding and decoding are described herein. For certain types and patterns of content, coefficient prediction exploits correlation between adjacent spectral coefficients, making subsequent entropy encoding more efficient. For example, an audio encoder predictively codes quantized spectral coefficients in the quantized domain and entropy encodes results of the predictive coding. Or, for a particular quantized spectral coefficient, an audio decoder entropy decodes a difference value, computes a predictor in the quantized domain, and combines the predictor and the difference value.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.