Pre-echo attenuation in a digital audio signal
US8676365B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 2009 |
| Grant date | Mar 18, 2014 |
| Priority date | — |
| Expiry date | Jun 29, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/025
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method is provided for attenuating pre-echoes in a digital audio signal generated from a transform encoding, comprising, upon decoding and for a current frame of said digital audio signal: defining a concatenated signal from at least the reconstructed signal of the current frame, dividing said concatenated signal into subunits of samples having a predetermined length, calculating the time envelope of the concatenated signal, detecting the transition of the time envelope towards a high-energy area, determining the low-energy sub-units preceding a subunit in which a transition has been detected, and an attenuation step in said determined subunits. The attenuation is carried out according to an attenuation factor calculated for each of the determined subunits, based on the time envelope of the concatenated signal. The invention also relates to a device for implementing said method, and to a decoder including such a device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.