Oversampling in a combined transposer filterbank
US9384750B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 3, 2014 |
| Grant date | Jul 5, 2016 |
| Priority date | — |
| Expiry date | Oct 3, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC12Q2600/156
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to coding of audio signals, and in particular to high frequency reconstruction methods including a frequency domain harmonic transposer. A system and method for generating a high frequency component of a signal from a low frequency component of the signal is described. The system comprises an analysis filter bank (501) comprising an analysis transformation unit (601) having a frequency resolution of Δf; and an analysis window (611) having a duration of DA; the analysis filter bank (501) being configured to provide a set of analysis subband signals from the low frequency component of the signal; a nonlinear processing unit (502, 650) configured to determine a set of synthesis subband signals based on a portion of the set of analysis subband signals, wherein the portion of the set of analysis subband signals is phase shifted by a transposition order T; and a synthesis filter bank (504) comprising a synthesis transformation unit (602) having a frequency resolution of QΔf; and a synthesis window (612) having a duration of DS; the synthesis filter bank (504) being configured to generate the high frequency component of the signal from the set of synthesis su…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.