System for automatic compensation of low frequency audio based on human loudness perceptual models
US8054993B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 2004 |
| Grant date | Nov 8, 2011 |
| Priority date | — |
| Expiry date | Nov 1, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2430/03
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A system for boosting the bass of an audio signal to closely match or mirrors a plurality of Robinson-Dadson loudness curves by interpolating coefficients from a table of values representing the Robinson-Dadson loudness. The system having a controller that interpolates the coefficients from the loudness curves and then uses the coefficients in a shelf filter that makes adjustments to the audio signal. The result of the adjustments to the audio signal is the introduction of bass boost slowly through a diminuendo or lowering of level through volume adjustment and to removes the bass boost rapidly during a crescendo or increase in level through user volume adjustment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.