Audio-peak limiting in slow and fast stages
US8488811B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 8, 2007 |
| Grant date | Jul 16, 2013 |
| Priority date | — |
| Expiry date | Apr 24, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G11/008
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for limiting the absolute magnitude of an audio signal. The method may include firstly variable-gain reducing the gain of an audio signal, and then secondly variable-gain reducing the gain of the audio signal faster than the first variable-gain reduction, thereby limiting the absolute magnitude of the audio signal to a threshold. The first variable-gain reduction may include variable-gain reducing the gain of the audio signal in a first stage, and the second variable-gain reduction may include variable-gain reducing the gain of the audio signal in a second stage that reduces the gain faster than the first stage. The second variable-gain reduction may include delaying the audio signal, finding a peak among the delayed audio signal, calculating a fast gain from a found peak, and modifying the delayed audio signal with the calculated fast gain.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.