Re: [music-dsp] Algorithms for finding seamless loops in audio

2010-12-02 Thread Stefan Stenzel
Now I wonder, am I the only one to calculate ACF using FFT? Regarding seamless loops, I found that quantizing frequencies to integer numbers of periods in the loop works extremely well. Regards, Stefan -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code

Re: [music-dsp] Algorithms for finding seamless loops in audio

2010-11-29 Thread Element Green
On Thu, Nov 25, 2010 at 9:33 PM, robert bristow-johnson r...@audioimagination.com wrote: depending on how big your window is, i think a better term for this is *cross-correlation* not autocorrelation.  it's a single stream of audio so in a sense of the word, it *is* autocorrelation, but what i

Re: [music-dsp] Algorithms for finding seamless loops in audio

2010-11-26 Thread robert bristow-johnson
On Nov 26, 2010, at 2:21 AM, Ross Bencina wrote: robert bristow-johnson wrote: you can have a periodic (or quasi-periodic) signal with absolutely no energy at harmonic #1 (what i would call the fundamental), and as long as it has energy in most other odd harmonics, the autocorrelation

Re: [music-dsp] Algorithms for finding seamless loops in audio

2010-11-25 Thread Ross Bencina
Element Green wrote: I'm the author of a SoundFont instrument editing application called Swami (http://swami.sourceforge.net). A while back an interested developer added a loop finding algorithm which I integrated into the application. This feature is supposed to generate a list of start/end

Re: [music-dsp] Algorithms for finding seamless loops in audio

2010-11-25 Thread Element Green
Hello Didier, On Wed, Nov 24, 2010 at 9:51 PM, Didier Dambrin di...@skynet.be wrote: IMHO finding loop points is the wrong problem to solve, it's better to make something loop instead, as (ideally) you're only gonna find the least bad loop points, nothing guarantees that there's anything

Re: [music-dsp] Algorithms for finding seamless loops in audio

2010-11-25 Thread Element Green
On Thu, Nov 25, 2010 at 2:14 AM, Johannes Kroll jkr...@lavabit.com wrote: On Thu, 25 Nov 2010 06:51:03 +0100 Didier Dambrin di...@skynet.be wrote: IMHO finding loop points is the wrong problem to solve, it's better to make something loop instead, as (ideally) you're only gonna find the least

Re: [music-dsp] Algorithms for finding seamless loops in audio

2010-11-25 Thread Element Green
On Thu, Nov 25, 2010 at 4:05 AM, Sebastian Stober sto...@ovgu.de wrote: Hi Joshua, you might be interested in this blog post: http://runningwithdata.tumblr.com/post/597154309/earworm-capsule about a graph-based approach. Best regards, Sebastian Does indeed sound like an interesting

Re: [music-dsp] Algorithms for finding seamless loops in audio

2010-11-24 Thread Alan Wolfe
Agreed here (: in 2d graphics and skeletal animation, making tileable 2d art and seamless blends are basically the same problems. in both areas they MAKE the things seamless instead of trying to find how they could be seamless. in 2d graphics this comes up via texturing (probably obvious), and