Fast algorithms for computation of 5-point DCT-II, DCT-IV, and DST-IV, and architectures
US8631060B2 · kind B2 · utility
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52Claims
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Key dates
| Filing date | Dec 12, 2008 |
| Grant date | Jan 14, 2014 |
| Priority date | — |
| Expiry date | Apr 16, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/0212
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A more efficient encoder/decoder is provided in which an N-point MDCT transform is mapped into smaller sized N/2-point DCT-IV, DST-IV and/or DCT-II transforms. The MDCT may be systematically decimated by factor of 2 by utilizing a uniformly scaled 5-point DCT-II core function as opposed to the DCT-IV or FFT cores used in many existing MDCT designs in audio codecs. Various transform factorizations of the 5-point transforms may be implemented to more efficiently implement a transform.
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