Rhythmic constant pitch time stretching for digital audio

Paper

Trevorrow, Brendan. 2014. "Rhythmic constant pitch time stretching for digital audio." Davy, John, Burgess, Marion, Don, Charles, Dowsett, Liz, McMinn, Terry and Broner, Norm (ed.) 43rd International Congress on Noise Control Engineering (INTERNOISE 2014): Improving the World Through Noise Control. Melbourne, Australia 16 - 19 Nov 2014 Brisbane, Australia.
Paper/Presentation Title

Rhythmic constant pitch time stretching for digital audio

Presentation TypePaper
Authors
AuthorTrevorrow, Brendan
EditorsDavy, John, Burgess, Marion, Don, Charles, Dowsett, Liz, McMinn, Terry and Broner, Norm
Journal or Proceedings TitleProceedings of the 43rd International Congress on Noise Control Engineering (INTERNOISE 2014)
ERA Conference ID50875
Number of Pages7
Year2014
Place of PublicationBrisbane, Australia
ISBN9780909882037
Web Address (URL) of Paperhttp://www.acoustics.asn.au/conference_proceedings/INTERNOISE2014/papers/p182.pdf
Conference/Event43rd International Congress on Noise Control Engineering (INTERNOISE 2014): Improving the World Through Noise Control
International Congress on Noise Control Engineering
Event Details
43rd International Congress on Noise Control Engineering (INTERNOISE 2014): Improving the World Through Noise Control
Event Date
16 to end of 19 Nov 2014
Event Location
Melbourne, Australia
Event Details
International Congress on Noise Control Engineering
Abstract

Constant pitch time stretching is not uncommon in audio editing software, however several issues arise when it is used on musical recordings, most notably the doubling and skipping of rhythmic transients. This paper examines three signal processing algorithms which are commonly used to provide constant pitch time stretching: these are SOLA (Synchronous Overlap and Add), TD-PSOLA (Time Domain Pitch Synchronous Overlap and Add), and Phase Vocoder. Enhancements to the SOLA and TD-PSOLA algorithms are provided which may make them more suited to rhythmic music. It is found that each of these three algorithms introduce audible artifacts in the time stretched waveform, the severity of these side effects and what causes them is also discussed.

Keywordsdigital audio; music; signal processing; acoustic noise
ANZSRC Field of Research 2020400909. Photonic and electro-optical devices, sensors and systems (excl. communications)
400607. Signal processing
461299. Software engineering not elsewhere classified
Public Notes

© 2014 The Australian Acoustical Society. Permission is granted for any person to reproduce a part of any abstract provided that the permission is obtained from the author(s) and credit is given to the author(s) and these conference proceedings.

Byline AffiliationsSchool of Mechanical and Electrical Engineering
Institution of OriginUniversity of Southern Queensland
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