Article View: comp.dsp
Article #2174Re: Pitch shifting
From: C.M. Hicks
Date: Wed, 06 Jan 1993 17:45
Date: Wed, 06 Jan 1993 17:45
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herman@nosc.mil (John W. Herman) writes: >cmh@eng.cam.ac.uk (C.M. Hicks) writes: >>mikael@terapin.com (Mikael Andersson) writes: >> - FFT, scale frequency, IFFT. >> Main problems: discontinuities at block boundaries, computational load. >Windowing the input function with a Hann window, shifting only half the >FFT length, and adding the appropriate outputs of the IFFT will produce >fairly smooth output time series. But likely not in real time. Yeah, this is basically what I had in mind, with a block length of around 10 to 50 milliseconds (maybe 1024 CD samples, roughly 20ms). My fear is that it may introduce a modulation at either one or two times the block frequency. Real-time should be possible with a DSP with some clout. Christopher Hicks -- ============================================================================== Christopher Hicks | If it doesn't fit... cmh@uk.ac.cam.eng | ...you need a bigger hammer. ==============================================================================
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Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!uknet!cam-eng!cmh From: cmh@eng.cam.ac.uk (C.M. Hicks) Newsgroups: comp.dsp Subject: Re: Pitch shifting Message-ID: <1993Jan6.174558.27810@eng.cam.ac.uk> Date: 6 Jan 93 17:45:58 GMT References: <mikael.31ea@terapin.com> <1993Jan5.184530.4560@eng.cam.ac.uk> <herman.726269308@phage> Sender: cmh@eng.cam.ac.uk (C.M. Hicks) Organization: cam.eng Lines: 25 Nntp-Posting-Host: tw500.eng.cam.ac.uk