Re: [Audacity-devel] Extreme Stretch for Audacity (updated patch2)
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From: Paul N <zyn...@ya...> - 2012-05-26 19:48:34
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Hi Michael. I updated the patch with 3 spaces instead of tabs and attached into the email. Regarding people wanting this, the effect became quite popular in last few years. Here are some articles about it: http://www.washingtonpost.com/lifestyle/style/time-stretching-warps-songs-into-sprawling-blurs/2011/12/27/gIQASnwARP_story.html http://www.g4tv.com/videos/55210/pauls-extreme-sound-stretch-play-with-sound-review/ http://www.npr.org/blogs/therecord/2010/08/18/129283985/the-art-of-a-time-stretch Regarding the algorithm, you can see better explained here (with minor modifications than the code submitted to Audacity): http://zynaddsubfx.sourceforge.net/doc/paulstretchsteps.png Indeed, it is a FFT->do_something->IFFT approach, but the phase randomization is an important step. It sounds best on choirs ( like this one http://ericwhitacre.com/blog/the-virtual-choir/virtual-choir-2-0-slowed-to-61-minutes ) , ensemble music (like this one http://soundcloud.com/birdfeeder/jurassic-park-theme-1000-slower - this has over 1 million views) . It is not just useful for time stretching but also to smear the sound over a period of time (if you set stretch=1.0 and window to a large value, like 5 seconds). This is an useful tool to create ambient music. Paul |