The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 25, 2009
Filed:
Sep. 07, 2005
Daniel Steinberg, Mountain View, CA (US);
Daniel Steinberg, Mountain View, CA (US);
Apple Inc., Cupertino, CA (US);
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.