Impulse noise detector and noise reduction system
US6385261B1 · kind B1 · utility
67Cited by
3References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 19, 1999 |
| Grant date | May 7, 2002 |
| Priority date | — |
| Expiry date | Jan 19, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/10
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An impulse noise detector detects impulse noise in an audio signal by filtering out the audio components of the signal, then comparing an envelope of a filtered signal with a threshold obtained as a moving average of the envelope. Short-duration impulse noise is thereby detected without detecting tone bursts and other fast-rising signals of longer duration. The envelope may be taken directly from the filtered signal, or from a difference signal obtained from a preliminary envelope of the filtered signal, to emphasize impulse noise when distorted audio components leak into the filtered signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.