Adaptive loudness control
US9391575B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 13, 2013 |
| Grant date | Jul 12, 2016 |
| Priority date | — |
| Expiry date | May 4, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/32
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Loudness control is performed by estimating the energy and loudness of an audio signal. Loudness of the audio signal is determined by decomposing the audio signal into multiple frequency bands at different center frequencies. The energy of the audio signal in each frequency band is calculated and converted to a loudness, using a function that models human loudness perceptions of audio energies at different frequencies. The loudnesses are summed to obtain the total loudness of the audio signal. A signal gain is calculated as a function of a loudness setting provided by a human listener, the estimated signal energy, and the total loudness of the audio signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.