Re: [Audacity-devel] Extreme Stretch for Audacity (updated patch2)
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From: Vaughan J. <va...@au...> - 2012-05-27 23:39:45
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Sounds right to me. "Time Smear", instead? - V On 5/26/2012 12:59 PM, Roger Dannenberg wrote: > I haven't heard the effect, and phase randomization to achieve an > "infinite stretch" or "infinite reverb" is definitely a useful thing, > but I don't think this is something we should advertise as time > stretching. I would expect at least a correctly implemented phase > vocoder under the label "time stretch." As long as we don't call this > "time stretch," I have no objections to it. Getting a good time stretch > effect is another issue. > > -Roger > > > On 5/26/12 3:48 PM, Paul N wrote: >> 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 >> >> |