Loudness modification of multichannel audio signals
US8019095B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 2007 |
| Grant date | Sep 13, 2011 |
| Priority date | — |
| Expiry date | Sep 28, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S2400/13
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Scaling, by a desired amount sm, the overall perceived loudness Lm of a multichannel audio signal, wherein perceived loudness is a nonlinear function of signal power P, by scaling the perceived loudness of each individual channel Lc by an amount substantially equal to the desired amount of scaling of the overall perceived loudness of all channels sm, subject to accuracy in calculations and the desired accuracy of the overall perceived loudness scaling sm. The perceived loudness of each individual channel may be scaled by changing the gain of each individual channel, wherein gain is a scaling of a channel's power. Optionally, in addition, the loudness scaling applied to each channel may be modified so as to reduce the difference between the actual overall loudness scaling and the desired amount of overall loudness scaling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.