Method and apparatus for enhancing loudness of an audio signal
US7177803B2 · kind B2 · utility
12Cited by
4References
5Claims
0Family size
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Key dates
| Filing date | Oct 22, 2002 |
| Grant date | Feb 13, 2007 |
| Priority date | — |
| Expiry date | Mar 1, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/15
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Human hearing perceives loudness based on critical bands corresponding to different frequency ranges. As a sound's frequency spectrum increases beyond a critical band into a previously unexcited critical band, the perception is that the sound has increased in loudness. To take advantage of this principle, a filter is applied to a speech signal so as to expand the formant bandwidths of formants in the speech sample.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.