Noise detection for audio encoding by mean and variance energy ratio
US7457747B2 · kind B2 · utility
2Cited by
6References
20Claims
0Family size
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Key dates
| Filing date | Aug 23, 2004 |
| Grant date | Nov 25, 2008 |
| Priority date | — |
| Expiry date | Oct 3, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/012
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The techniques described are utilized for detection of noise and noise-like segments in audio coding. The techniques can include performing a prediction gain calculation, an energy compaction calculation, and a mean and variation energy calculation. Signal adaptive noise decisions can be made both in time and frequency dimensions. The techniques can be embodied as part of an AAC (advanced audio coding) encoder to detect noise and noise-like spectral bands. This detected information is transmitted in a bitstream using a signaling method defined for a perceptual noise substitution (PNS) encoding tool of the AAC encoder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.