Comments on: Spectral Analysis source files http://stephan.acidcats.nl/blog/2009/03/01/spectral-analysis-source-files/ from the trenches of software development Fri, 17 Dec 2010 11:00:54 +0000 http://wordpress.org/?v=2.9.1 hourly 1 By: stephan http://stephan.acidcats.nl/blog/2009/03/01/spectral-analysis-source-files/comment-page-1/#comment-10882 stephan Sun, 17 Jan 2010 16:45:45 +0000 http://stephan.acidcats.nl/blog/?p=39#comment-10882 Would be good to try pitch detection yeah, especially with Flash player 10.1 coming up. I haven't had the time to delve into it, but what I do know about it is that pitch detection is basically a double FFT. Googling should get you more details on that. I suggest you start with something simpler than piano though. Piano tones are known to contain a lot of non harmonic overtones, which will give a lot of misses on the pitch detection if you use double FFT. Voice is prob a better start :D Would be good to try pitch detection yeah, especially with Flash player 10.1 coming up. I haven’t had the time to delve into it, but what I do know about it is that pitch detection is basically a double FFT. Googling should get you more details on that. I suggest you start with something simpler than piano though. Piano tones are known to contain a lot of non harmonic overtones, which will give a lot of misses on the pitch detection if you use double FFT. Voice is prob a better start :D

]]> By: phil http://stephan.acidcats.nl/blog/2009/03/01/spectral-analysis-source-files/comment-page-1/#comment-10881 phil Sun, 17 Jan 2010 16:22:27 +0000 http://stephan.acidcats.nl/blog/?p=39#comment-10881 hey stephan, i'm pretty new to FFT and it's uses. But i'm trying to figure out how to do pitch detection on simple sounds. Say for example a single piano note. maybe you could point me in the right direction? :) hey stephan, i’m pretty new to FFT and it’s uses. But i’m trying to figure out how to do pitch detection on simple sounds. Say for example a single piano note. maybe you could point me in the right direction? :)

]]> By: makc http://stephan.acidcats.nl/blog/2009/03/01/spectral-analysis-source-files/comment-page-1/#comment-10117 makc Mon, 28 Sep 2009 14:42:54 +0000 http://stephan.acidcats.nl/blog/?p=39#comment-10117 damn, why didn't I find this post <a href="http://twitter.com/makc3d/status/4381425518" rel="nofollow">earlier</a>:( damn, why didn’t I find this post earlier :(

]]> By: stephan http://stephan.acidcats.nl/blog/2009/03/01/spectral-analysis-source-files/comment-page-1/#comment-5737 stephan Sat, 14 Mar 2009 21:53:13 +0000 http://stephan.acidcats.nl/blog/?p=39#comment-5737 Looks good! I don't mind you changing package & class name, after all, it's your effort :) Anything to get this stuff going. Keep me posted on your performance upgrades! Looks good! I don’t mind you changing package & class name, after all, it’s your effort :) Anything to get this stuff going. Keep me posted on your performance upgrades!

]]> By: vFragosop http://stephan.acidcats.nl/blog/2009/03/01/spectral-analysis-source-files/comment-page-1/#comment-5729 vFragosop Sat, 14 Mar 2009 01:52:42 +0000 http://stephan.acidcats.nl/blog/?p=39#comment-5729 Hi again Stephan. I've done some <a href="http://labs.vfragosop.com/Crush.html" rel="nofollow">testings</a> with your sources. With some minor upgrades it will be running really really fast. I've uploaded one of the tests and the <a href="http://labs.vfragosop.com/Crush_sources.rar" rel="nofollow">sources</a> to share with you some ideas. Note that I've modified the class name and its package cause I rewrote the code to better understand how the work was done without having to overwrite your code so I could compare results. But, since I have no intentions besides colaborate with you and learn about fft and complex functions performance, I guess there's no problem. Please, let me know if you feel uncomfortable about that. Hi again Stephan. I’ve done some testings with your sources. With some minor upgrades it will be running really really fast.
I’ve uploaded one of the tests and the sources to share with you some ideas.

Note that I’ve modified the class name and its package cause I rewrote the code to better understand how the work was done without having to overwrite your code so I could compare results.

But, since I have no intentions besides colaborate with you and learn about fft and complex functions performance, I guess there’s no problem. Please, let me know if you feel uncomfortable about that.

]]> By: vFragosop http://stephan.acidcats.nl/blog/2009/03/01/spectral-analysis-source-files/comment-page-1/#comment-5726 vFragosop Wed, 11 Mar 2009 00:12:54 +0000 http://stephan.acidcats.nl/blog/?p=39#comment-5726 Own!!! Nice nice news.. I'll check out the codes, and hopefully comeback with nice suggestions.. Thanks for the draft and the time spent. I'm forwarding this link for some other guys who are interested on Actionscript FFT too. Maybe we all can help you! Own!!! Nice nice news.. I’ll check out the codes, and hopefully comeback with nice suggestions.. Thanks for the draft and the time spent.
I’m forwarding this link for some other guys who are interested on Actionscript FFT too.
Maybe we all can help you!

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