Constant pitch variable speed audio decoding
US7580833B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 7, 2005 |
| Grant date | Aug 25, 2009 |
| Priority date | — |
| Expiry date | Nov 5, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/90
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A digital audio signal can be processed to have a constant pitch for a range of playback rates. A playback rate associated with a portion of the digital audio signal can be received, which differs from the rate at which the digital audio signal was recorded. A channel of the digital audio signal can be divided into a plurality of windows and one or more cross-correlation evaluations can be performed for at least a first window and a second window of the channel to determine an appropriate overlap. Further, the first cross-correlation evaluation can be performed using an ideal overlap. One or more sample values associated with a first waveform included in the first window can be averaged with one or more corresponding sample values associated with a second waveform included in the second window for the determined appropriate overlap to generate a rate-modified audio signal, which can be played.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.