System for fourier transform-based modification of audio
US6112169A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 7, 1996 |
| Grant date | Aug 29, 2000 |
| Priority date | — |
| Expiry date | Nov 7, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/27
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system and method for preserving the natural sound of a signal that is processed by an analysis step of converting the signal into a sequence of overlapping windowed DFT representations and a synthesis step of converting these DFT representations back to a time domain signal. For example, the system and method are applicable to analysis-synthesis systems based on a sequence of overlapping windowed, DFT representations in which either: (1) the analysis transforms overlap in time by a different amount than the synthesis transforms, or (2) the modification involves a re-mapping of transform values from one frequency location to another. The phases of the complex-valued DFT representations may be modified so that synthesis of the time domain signal results in a natural sound despite the effects of e.g., either (1) or (2).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.