I've tried to build a distortion just using some parametric filters for boost the input signal,and than a clipper..
..but the results are not so good..
do you have some suggestions?

I havent find any good distortion algorithms on the web..

leonarrdo-

Use an array. One about 8192 wide is good enough for nice results.

Multiply your input by 4096 and add 4096, use that to index a normalised 8192 table (-1 to +1)
and start drawing some nice curves into te graph.

this is a cool trick

Is this waveshaping?

would anyone care to elaborate on this? I am confused on how to modulate tables with another table? what objects are used to input into the first array and what objects are used to index the normalised array? thanks....

db

note- i never knew you could draw inside of an array...curiosity never struck....very cool indeed...

I'm no expert but you might want to look at
3.audio examples/ -> B02.two-wavetables.pd
In the documentation.
I dont know if its what you are looking for but, It shows one way modulate a wavetable with another.

Put up a table with a size of 8192 called $0-waveTable. Then this is what i did:

[inlet~]
|
[*~ 4096]
|
[+~ 4096]
|
[tabread~ $0-waveTable]
|
[outlet~]

Now manually draw in the table and you'll hear the waveshaping (at least, that's what i think it is). So every possible sample value, ranging from -1 to 1, will be replaced by it's corresponding value in the table, and it sounds very nice to me. Thanx obi for this.

Isn't B02 more an example of fm synthesis, where you have an audio source (e.g. an oscillator) modulating the frequency of a second oscillator?

D.

thanks so much. this was very helpful to me, I was trying to use two tables and too much stuff in between, pretty straight forward. and I had looked through the examples for help and didn't find it...cheers and thanks for opening my eyes to this.!
db

Oh yeah!~ It gets better - try using a [tabsend~] to write to the indexed table. I actually ended up using a table only 64 positions in length, just right for the default blocksize and it sound ahhhmayyyzing.

Now it's your turn to shed some more light on what you're doing i guess

nestor, what did you use for sending to the indexed table? osc~? your inlet~?

Will post when I get off work.

Try this.

@nestor said:

Try this.

Not bad

is there an attachment I can't see? (I'm logged in)

Yeah. I'm not seeing the attachment either.

Hmm, I don't seen to recall..... I'll poke around in some folders.

Edit: Something like this maybe? Load 2 loops....

http://www.pdpatchrepo.info/hurleur/comingled.pd

FYI,
I've been playing with the technique posted by domien for a guitar amp simulator effect. I used a much smaller table (12) and tabread4~. This is much easier to fine tune. Follow it with some EQ and freeverb~ and it sounds as good as any other amp simulator I've used.

dack, do you want to share waveshape arrays? here's my favourite:

-0.928551
0.942857
0.942857
-0.328557
-0.0571318
-0.12856
-0.328557
-0.442842
-0.614269
-0.614269
-0.542841
-0.314272

definitely doesn't sound as good as any other amp simulator I've used though!!

posted some other distortions at:
<http://puredata.hurleur.com/sujet-2453-cubic-soft-clip-distortion>