Economical loudness measurement of coded audio
US8239050B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 2006 |
| Grant date | Aug 7, 2012 |
| Priority date | — |
| Expiry date | Sep 15, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S2400/13
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Measuring the loudness of audio encoded in a bitstream that includes data from which an approximation of the power spectrum of the audio can be derived without fully decoding the audio is performed by deriving the approximation of the power spectrum of the audio from said bitstream without fully decoding the audio, and determining an approximate loudness of the audio in response to the approximation of the power spectrum of the audio. The data may include coarse representations of the audio and associated finer representations of the audio, the approximation of the power spectrum of the audio being derived from the coarse representations of the audio. In the case of subband encoded audio, the coarse representations of the audio may comprise scale factors and the associated finer representations of the audio may comprise sample data associated with each scale factor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.