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Forum: VirtualDJ Plugins

话题: Message for Stephane or other people who know something about FFT

由于该帖子已年深日久,可能包含陈旧过时或描述错误的信息。

ikkeHome userMember since 2003
Can someone please tell me what the fastest FFT and iFFT libs are? Maybe one of the ops can ask Stephane once... (sorry for my english).

Thanks!

Greetz, ikke
 

发表时间 Sun 17 Mar 02 @ 11:59 am
FFT=Fast Fourier Transform ?
a quick algorithm to compute the Fourier transform (and the find the most important frequencies , probably used in beat matching)

but maybe it was not the question.
(abd maybe it is not the answer ;-)

Maxime
 

发表时间 Tue 19 Mar 02 @ 4:22 pm
ikkeHome userMember since 2003
Yep, that's it! I found the Intel SPL and FFTW, but they seem quite difficult to use... I don't need all those functions. Only the FFT transform and the magnitude, phase and freq extraction. I found some code (www.dspdimension.com, really a great site!) but it's not fast enough...
 

发表时间 Tue 19 Mar 02 @ 5:06 pm
you're smart ...
 

发表时间 Wed 20 Mar 02 @ 1:33 am
Oh ! I forgot to ask you...

I've asked Corpse already .... but he's a busy guy: Is it possible to write an algorithm which alters the pitch (instrumental tone) of the sound without modifying the speed/tempo ???

This way when you are making mixes .... not only the speed is matched but also the instrumental tone. But I am sure when if you were to alter something like that .... I assume it would definately alter the sound quality ? Mixvibes has a feature like that (Not that i am saying mixvibes IS better ? duh !)

-- Dave --
 

发表时间 Wed 20 Mar 02 @ 1:36 am
ikkeHome userMember since 2003
Hey man, that'll be my next effect!!! I'll send it to you this afternoon!!!
 

发表时间 Wed 20 Mar 02 @ 2:50 pm
ikkeHome userMember since 2003
Well, I tried MV 4 Pro yesterday, and there's one BIG problem with it: the BPM detection is really tooo slow, and you always need to scroll wehn you use a resolution of 600*800
 

发表时间 Wed 20 Mar 02 @ 3:00 pm


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