samples synthesis

aquanaut · Posted: Sun Apr 25, 2004 5:19 pm Post subject: samples synthesis

hi everybody...first post here

does somebody know if it's possible to synthesis 2 samples together using FM. i'd like to go beyond either a simple mix or the mutation fonction that soundhack provides.?

Nicholas

mosc · Posted: Sun Apr 25, 2004 7:10 pm Post subject:

Hi, Nicholas. Welcome to electro-music.com.

I'm not sure what you are asking. Do you want to frequency module one sample with another?

elektro80 · Posted: Mon Apr 26, 2004 2:58 am Post subject:

You are talking morphing and or true resynthesis here?? You are using mac or pc?

seraph · Posted: Mon Apr 26, 2004 3:54 am Post subject:

maybe through the Fourier Transform:
The Fourier transform, in essence, decomposes or separates a waveform or function into sinusoids of different frequency which sum to the original waveform. It identifies or distinguishes the different frequency sinusoids and their respective amplitudes.

http://aurora.phys.utk.edu/~forrest/papers/fourier/
http://en.wikipedia.org/wiki/Fast_Fourier_transform
Idea

elektro80 · Posted: Mon Apr 26, 2004 4:02 am Post subject:

THX Carlo!

aquanaut · Posted: Mon Apr 26, 2004 9:48 am Post subject:

Thanks for the reply

yes i'd like to mosc. but it also seem that this method will create an effect.

/////
elektro80
i want to blend a violin and a cello. maybe a resynthesis would do the trick but i don't want an approximation done with an oscillator.

i have a mac.

/////
thanks seraph for the links. that's too far out for me.

Nicholas

seraph · Posted: Mon Apr 26, 2004 10:05 am Post subject:

paul e. · Posted: Mon Apr 26, 2004 11:15 am Post subject:

'Metasynth' is a great app for FFT...made simple....

http://www.uisoftware.com/PAGES/products.html

some other great little apps too...

aquanaut · Posted: Mon Apr 26, 2004 12:20 pm Post subject:

some other great little apps too...[/quote]

May i dare ask what are those?

right now i'm using

-Cecilila
-Soundhack
-Marcohack
-Metasynth
-SonicWorx artist
-Turbosynth and Lemur Pro

Nicholas

paul e. · Posted: Mon Apr 26, 2004 3:40 pm Post subject:

ah sorry...what i meant was, that software company [u and i software] has a few other cool apps as well..like artmatic etc

anyway, once thing you might be interested in is SuperCollider

http://www.audiosynth.com

it's free and is very powerful synth, fx machine etc etc etc

there are lots of good tutorial patches.

HIGHLY recommended... since you mentioned you use things like Lemur etc

paul e. · Posted: Mon Apr 26, 2004 9:19 pm Post subject:

come to think of it...in metasynth there is 'cross convolve'...that would do it...

or..'formants filter'...oooohhh..that is fun stuff

all under the 'Morph' menu

aquanaut · Posted: Tue Apr 27, 2004 12:01 pm Post subject:

in Metasynth 2.7 you have also spectrum analysis/resynthesis.

i feel a bit stupid saying that.

i think i might be able to blend those strings samples with that process.

Anig Browl · Joined: May 05, 2004 Posts: 20 Location: San Francisco

Well, you could get hold of Reaktor, tht allows sample FM. The thing is, if you use a sample of a cello (say), because it is a recording of an oscillating string rather than an oscillator per se, FMing it will basically be like super-fast scratching. Negative FM values will make the sample play backwards and FM values lower than the sample rate will cause the pitch of the sample to fall. Now this is all to the good - I built a DJ thing in Reaktor ages ago to emulate vinyl scratching, cutting power to the turntable etc., and there is a much more powerful implementation of the same idea that ships with the product nowadays (and the demo I think). If you can get near a Kurzweil K2xxx synth, that also allows you to do FM on samples which can create some wicked textures, though you will be restricted to things like LFOs, envelopes and FUNs for the FM modulator sources.

But if you FM a cello sample with a flute sample, well you will certainly get some interesting noises but they will probably be pretty harsh and unmusical, not what you are expecting. If you want to do weird things with samples, I suggest playing different sampler channels into the G2 and then using filters and envelope followers on one sample to fiddle with the dynamics of the other, as a starting point.

play · Posted: Thu May 06, 2004 5:44 pm Post subject:

if u use an app that allows simple math on audio streams (a la reaktor, maxmsp) you can just multiply the two signals. that's the simplest modulation possible. It won't give that weird resynthesized quality that inevitable occurs when using fft, sine wav modulation, etc. It might be really quiet though, or really loud, or on an extreme end of the frequency spectrum. when I do simple modulation like that I usually do some post limiting and maybe pitch shifting as well.

maxmsp has some great fft objects if you can force yourself to spend a couple days understanding them. there's also the oft-overlooked plogue bidule (http://www.plogue.com/forums.html?option=content&task=view&id=11&Itemid=28)

happy mangling ::)