Compensator and compensation method for audio frame loss in modified discrete cosine transform domain
US8731910B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 2010 |
| Grant date | May 20, 2014 |
| Priority date | — |
| Expiry date | Oct 19, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/0212
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The invention provides a compensation method for audio frame loss in a MDCT domain, the method comprising: when a frame currently lost is a Pth frame, obtaining a set of frequencies to be predicted, and for each frequency in the set, using phases and amplitudes of a plurality of frames before a (P−1)th frame in a MDCT-MDST domain to predict a phase and an amplitude of the Pth frame, and using the predicted phase and amplitude to obtain a MDCT coefficient of the Pth frame at each corresponding frequency; for a frequency outside the set, using MDCT coefficients of a plurality of frames before the Pth frame to calculate a MDCT coefficient value of the Pth frame at the frequency; performing an IMDCT for the MDCT coefficients of the Pth frame to obtain a time domain signal of the Pth frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.