Real-time Sliding Phase Vocoder using a Commodity GPU

Russell Bradford, John ffitch, Richard Dobson

Research output: Chapter or section in a book/report/conference proceedingChapter or section

6 Citations (SciVal)
56 Downloads (Pure)


We describe a new approach to the processing of audio by way of transformations to and from the frequency domain. In previous papers we described the Sliding Discrete Fourier Transform (SDFT), comprising an extension to the classic phase vocoder algorithm to perform a frame update every sample. We proposed this as offering musical advantages over the common STDFT, including lower latency and the potential for new classes of effect. Its major disadvantage has been the very high computational cost, which makes it intractable for real-time use even on high-specification consumer workstations.

We report on a version of the SDFT that exploits the intrinsic parallelism of the scheme on a commodity GPU, to implement the transform and its inverse in real time for multiple audio channels. This implementation is used to provide previously uncomputable real-time effects. We describe a key new effect, enabled by the method, which we have called Transformational FM (TFM).

Original languageEnglish
Title of host publicationProceedings of ICMC 2011
PublisherUniversity of Huddersfield and ICMA
Number of pages4
ISBN (Print)978-0-9845274-0-3
Publication statusPublished - Aug 2011
EventProceedings of ICMC2011 -
Duration: 1 Aug 2011 → …

Publication series

PublisherUniversity of Huddersfield and ICMA


ConferenceProceedings of ICMC2011
Period1/08/11 → …


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