Method and apparatus for evaluating audio distortion
US5402495A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 7, 1993 |
| Grant date | Mar 28, 1995 |
| Priority date | — |
| Expiry date | Oct 7, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R29/001
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is provided an improved apparatus and method which include precisely adjustable digital circuitries employing psychoacoustic modeling so that the results obtained have a best consistency with actual human auditory perception. The apparatus comprises a first estimator for estimating a power density spectrum of an input digital audio signal to the audio system; a detector for determining a masking threshold depending on the power density spectrum of the input digital audio signal as an audible limit reflecting human auditory faculty; a second estimator for estimating a power density spectrum of an error signal representative of the difference between the input digital audio signal and its output digital audio signal from the audio system; and a third estimator for estimating the power density spectrum of the error signal which exceed the masking threshold and for calculating a perceptual spectrum distance(PSD) representative of the audio distortion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.