Unequal error protection for perceptual audio coders
US6405338B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1998 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | Feb 11, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/0059
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An audio information bit stream including audio control bits and audio data bits is processed for transmission in a communication system. The audio data bits are first separated into n classes based on error sensitivity, that is, the impact of errors in particular audio data bits on perceived quality of an audio signal reconstructed from the transmission. Each of the n different classes of audio data bits is then provided with a corresponding one of n different levels of error protection, where n is greater than or equal to two. The invention thereby matches error protection for the audio data bits to source and channel error sensitivity. The audio control bits may be transmitted independently of the audio data bits, using an additional level of error protection higher than that used for any of the n classes of the audio data bits. Alternatively, the control bits may be combined with one of the n classes of audio data bits and provided with the highest of the n levels of error protection. Further protection may be provided for the control bits by repeating at least a portion of the control bits from a current packet of the audio information bit stream in a subsequent packet of the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.