Block length decision based on tonality index
US6456963B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 20, 2000 |
| Grant date | Sep 24, 2002 |
| Priority date | — |
| Expiry date | Mar 20, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/0208
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A converting portion converts each of blocks of an input digital audio signal into a number of spectral frequency-band components, the blocks being produced from the signal along a time axis. A bit-allocating portion allocates coding bits to each frequency band. A scalefactor is determined in accordance with the number of the coding bits allocated. The digital audio signal is quantized using the scalefactors. Each block of the input digital audio signal is converted into the number of spectral frequency-band components. A tonality index of the digital audio signal is calculated in each of a predetermined one or plurality of frequency bands. The tonality index is compared with a predetermined one or plurality of thresholds. A decision to use the long or short block type is based on the thus-obtained comparison result.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.