Enhancing audio signals by nonlinear spectral operations
US7277550B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 2003 |
| Grant date | Oct 2, 2007 |
| Priority date | — |
| Expiry date | Jun 27, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G7/007
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A system and method are disclosed for enhancing audio signals by nonlinear spectral operations. Successive portions of the audio signal are processed using a subband filter bank. A nonlinear modification is applied to the output of the subband filter bank for each successive portion of the audio signal to generate a modified subband filter bank output for each successive portion. The modified subband filter bank output for each successive portion is processed using an appropriate synthesis subband filter bank to construct a modified time-domain audio signal. High modulation frequency portions of the audio signal may be emphasized or de-emphasized, as desired. The modification may be applied within one or more frequency bands.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.