System and method of encoding and decoding a layered bitstream by re-applying psychoacoustic analysis in the decoder
US6092041A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1996 |
| Grant date | Jul 18, 2000 |
| Priority date | — |
| Expiry date | Aug 22, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/002
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The invention provides a device, method (400,500,600), and system (100) to improve compression efficiency when coding audio for bitrate scalability. It includes at least one of an encoder and a decoder and is applicable when utilizing perceptual coding for an upper bitrate. The encoder includes a hybrid psychoacoustic modeling unit, coupled to receive lowband audio and diffband audio, for determining psychoacoustic data, and a quantizer control and zero-flagging unit, coupled to receive psychoacoustic data and diffband audio, for determining explicit quantizer stepsize parameters and at least one of: 1) implicit quantizer stepsize parameters and 2) implicit zero-flags. The decoder includes a lowband psychoacoustic model, coupled to receive lowband audio samples, for determining lowband psychoacoustic data, and a implicit quantizer stepsize and zero-flag computer, coupled to receive lowband psychoacoustic data for determining at least one of: 1) implicit quantizer stepsize parameters and 2) implicit zero-flags.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.