Audio decoding
US8433583B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 23, 2007 |
| Grant date | Apr 30, 2013 |
| Priority date | — |
| Expiry date | Dec 26, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/18
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An audio decoder comprises a receiver (801) for receiving input data comprising an N-channel signal corresponding to a down-mixed signal of an M-channel audio signal, M>N, having complex valued subband encoding matrices applied in frequency subbands and parametric multi-channel data. A subband filter bank (805) generates real-valued frequency subbands for the N-channel signal. A matrix processor (809) determines real-valued subband decoding matrices for compensating the application of the encoding matrices in response to the parametric multi-channel data. A compensation processor (807) generates down-mix data corresponding to the down-mixed signal by a matrix multiplication of the real-valued subband decoding matrices and data of the N-channel signal in the at least some real-valued frequency subbands. The down-mix data can be used to regenerate the down-mixed signal and the M-channel audio signal. The decoder may compensate for MPEG Matrix Surround Compatibility operations performed at the encoder using real-valued frequency subbands.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.