Propellerhead Software
Prev Previous Post   Next Post Next
  #1  
Old 2007-09-26, 13:14
audax's Avatar
audax audax is offline
 
Join Date: Sep 2007
Posts: 44
Physical modeling

Hello everybody!

I was asked by document02 to post some more details about my pm synthesizer entirely done in R3.

[link]
http://www.propellerheads.se/songs/r...onstration.rps

Maybe someone is interested in.

I am not a PM pro, so don't expect too much professional information like a physicist could provide .

So this is how it's working:

As mentioned in another thread in the feature suggestion forum, physical modeling takes another approach for generating tones.

The [source] is producing a mix of noise and an odd harmonics oscillator to produce a natural sounding tone like a blower of a whistle.

Every instrument "reacts" to certain frequencies, that is called resonance. As you may have guessed, the resonance points aren't easily matched by a simple [LP|HP|BP]/ res filter, but we can simulate a body containing certain resonance characteristics. Usually the body is a hall effect.

Now, depending on the instrument type, certain parameters are of interest in generating a usable tone:

- a modified comb filter can be used to "stimulate" certain resonance frequencies (a trumpet may have a slight variation of comb frequency)

- the body [hall fx] provides us with irregular resonance points

- to improve the sounding of a tone we can use some of the scream algorithms to create a richer sounding source, that is more "unpredictable" ie has more irregular characteristics ( like in real nature)

- the oscillation types: you may vary the types of oscillation like using a rectangle shape instead of sawtooth ( yes, a sawtooth contains not pure odd harmonics)

PS: I'm not good in writing tutorials. Please feel free to post any comments or questions. I'll try to answer them as soon as possible.

audax
 

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT +2. The time now is 21:10.