Voice decoder and method for detecting channel errors using spectral energy evolution
US6658112B1 · kind B1 · utility
10Cited by
14References
20Claims
0Family size
Assignee
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Key dates
| Filing date | Aug 6, 1999 |
| Grant date | Dec 2, 2003 |
| Priority date | — |
| Expiry date | Aug 6, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/005
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A voice decoder detects channel errors and loss of cryptographic synchronization using the change in spectral energy between sequential frames. The change in energy between frames is determined between corresponding LSP's of said successive frames and summed together. A running average of the change in energy for a predetermined number of frames is maintained. Current voice frames are eliminated based on the difference between the change in energy associated with the current frame and the running average. Accordingly, offensive audio associated with such channel errors or cryptographic synchronization loss is eliminated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.