Re: [Audacity-nyquist] Using audacity to automatically generate amplitude data
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From: David R. S. <dav...@sh...> - 2007-10-09 04:51:25
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On Sun, 7 Oct 2007, Roger Dannenberg wrote: > Edgar writes that analysis in Nyquist is not practical because of memory > issues. > > This is definitely a problem, especially in Audacity, but only because > the simplest or most natural-looking programs have a tendency to save > samples in memory. There are ways to access sounds such that samples are > not retained in memory. I'm not 100% certain of this in every case > because there are subtle interactions with Audacity. If there's a > generic problem, e.g. find the maximum amplitude for each spectral bin, > that characterizes analysis problems of interest, I'd be willing to work > out a constant-memory implementation that might serve as a template for > other analysis tasks. > Hi Roger, If I understand you correctly, you could work out some Nyquist code which would make it possible to (for instance) use the peak function in Audacity/Nyquist so that normalization code wouldn't cause samples to be put in memory? I would _LOVE_ this!! I submitted an updated delay.ny to the devel list, the early or possibly later version is going to be included in an Audacity build. It uses the peak function, but I had to limit samples checked to 1 million - at some point between this and 10 million samples checked, my old Windows 98 machine grinds endlessly. thanks very much David > - Roger > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Splunk Inc. > Still grepping through log files to find problems? Stop. > Now Search log events and configuration files using AJAX and a browser. > Download your FREE copy of Splunk now >> http://get.splunk.com/ > _______________________________________________ > Audacity-nyquist mailing list > Aud...@li... > https://lists.sourceforge.net/lists/listinfo/audacity-nyquist > -- David R. Sky http://www.shellworld.net/~davidsky/ |