Method and apparatus for encoding and decoding audio information representing three-dimensional sound fields
US5909664A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | May 23, 1997 |
| Grant date | Jun 1, 1999 |
| Priority date | — |
| Expiry date | May 23, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04H20/91
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an encoder, multiple channels of audio information representing multidimensional sound fields are split into subband signals and the subband signals in one or more subbands are combined to form composite signals. The composite signals, the subband signals not combined into a composite signal and information describing the spectral levels of subband signals combined into composite signals are assembled into an encoded output signal. The spectral level information conveys either the amplitude or power of the combined subband signals or the apparent direction of the sound field represented by the combined subband signals. In digital implementations, adaptive bit allocation may be used to reduce the informational requirements of the encoded signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.