System for fourier transform-based modification of audio

Details System for fourier transform-based modification of audio System for fourier transform-based modification of audio

1996-11-07

2000-08-29

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

381 943, 704206, G10L 1902

Patent

active

06112169&

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).

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