Audio encoding/decoding for reducing pre-echo of a transient as a function of bit rate
US8463614B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 10, 2009 |
| Grant date | Jun 11, 2013 |
| Priority date | — |
| Expiry date | Oct 5, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/025
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An audio encoding method and a corresponding decoding method are provided. Accordingly, the pre-echo effect of the audio transient signal is eliminated and the distortion of the transient signal is mitigated. The technical solution includes performing time-domain processing on an input audio transient signal; dividing sampling points x1,x2, . . . , xN of an input frame into L segments; calculating an energy Ei for each segment; calculating an average energy E0 for each segment of the input frame; calculating a multiplying parameter λi corresponding to each segment by virtue of λi=r(bitrate)*E0/Ei; multiplying the sampling points of all the segments of the input frame by corresponding multiplying parameter λi, obtaining the processed sampling points x1′,x2′, . . . , xN′; and sending the multiplying parameter λi to a code stream for transportation; performing time-frequency transformation and coding on the processed sampling points x1′,x2′, . . . , xN′ and outputting to the code stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.