Error detection method for sub-band coding
US4831624A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 1988 |
| Grant date | May 16, 1989 |
| Priority date | — |
| Expiry date | Apr 4, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2001/0098
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and apparatus is disclosed for improving the quality of speech samples communicated via sub-band coding utilizing adaptive bit allocation, by providing error detection only on the adaptive bit allocation information. A first error detection code, such as a cyclic redundancy check (CRC), is calculated on the bit allocation parameters in the transmitter and sent to the receiver, where a second error detection code is calculated based upon the reconstructed bit allocation parameters. The transmitted error detection code is then used to determine if the received bit allocation information is correct, and if not, the frame of speech data is discarded. By protecting only the bit allocation information, additional speech frames may be salvaged from the error-prone channel, thus further increasing speech intelligibility.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.