Packet loss compensation method using injection of spectrally shaped noise
US7002913B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 18, 2001 |
| Grant date | Feb 21, 2006 |
| Priority date | — |
| Expiry date | Jul 16, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/005
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An insertion-based error concealment method and apparatus are provided whereby, instead of directly inserting white noise, a filter is created to shape the white noise. The filtered white noise is then used to replace lost data. The method of the present invention is implemented by first estimating the power spectrum of the previous frame; then designing a filter with transfer function H(f), where |H(f)|2=the estimated power spectrum; and finally generating the replacement packet using noise which has been spectrally modified by the filter. The resulting filtered noise has the same power spectrum as the previous packet but is not highly correlated with it.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.