[Stk] Wah-wah filter?
Perry Cook
prc at CS.Princeton.EDU
Sun Oct 6 15:32:16 PDT 2013
Of course! I'll post in both ChucK and STK groups.
PRC
On Oct 6, 2013, at 3:31 PM, Robert Oschler wrote:
> Hello Perry,
>
> Will you be posting the results?
>
> Robert
>
> On Sun, Oct 6, 2013 at 2:48 PM, Perry Cook <prc at cs.princeton.edu> wrote:
>> I especially like the end result of Julius' experiments
>> with his CryBaby:
>>
>> The estimated Q values printed at the end are
>> Q = [9.4, 4.0, 1.9],
>>
>> and the estimated pole frequencies are
>> fp = [464, 838, 2252] Hz.
>>
>> This, plus other data from that article, pretty much
>> sets you up to use a 2pole resonator, and just interpolate
>> between (and beyond) those values.
>>
>> Think ill code this up in ChucK this afternoon!!
>>
>> Prc
>>
>>
>> Sent from my iPad :-)
>>
>> On Oct 5, 2013, at 7:32 AM, Stephen Sinclair <sinclair at music.mcgill.ca>
>> wrote:
>>
>> On Sat, Oct 5, 2013 at 1:23 AM, Robert Oschler <robert.oschler at gmail.com>
>> wrote:
>>
>> Hello all,
>>
>>
>> I'm a veteran C++ programmer but I am brand new to the STK. Although
>>
>> somewhat math challenged I do know basic DSP principles. Is there a
>>
>> built-in effect that creates a good Wah-Wah pedal effect? If so,
>>
>> where do I start poking around to use it? If not, are there some
>>
>> low-level filter effects I can use to build one? Or do I have to go
>>
>> it alone and create a separate block of code that does the DSP
>>
>> operations necessary to create the Wah effect?: Note, need it to be
>>
>> fast enough for real-time processing.
>>
>>
>> http://en.wikipedia.org/wiki/Wah-wah_pedal
>>
>>
>> For the guitarists out there, I want to create a truly solid Wah
>>
>> effect that really sounds like a mouth opening and closing around the
>>
>> sound, something with some body to it, instead of an adjustable cutoff
>>
>> filter that sounds more like someone simply twisting the Treble knob
>>
>> on a stereo (is there some resonance processing involved with
>>
>> achieving an enhanced Wah effect?). I'm going to use the effect to
>>
>> process the sound output of my current STK waveform output.
>>
>>
>>
>> Hi Robert,
>>
>> So there's a bit of work out there on wah wah pedal modeling if you
>> search google scholar. One that jumps out is Julius Smith's work
>> which specifically shows how to emulate the Cry Baby pedal, perhaps
>> it's of interest:
>>
>> https://ccrma.stanford.edu/realsimple/faust_strings/faust_strings.pdf
>>
>> In general (if i understand correctly) a wah wah pedal *is* just a
>> resonant low pass filter. You might be able to use STK's TwoPole
>> class to implement it.
>>
>> Not sure if that answers your question though, since I don't know
>> exactly what you mean by "something with some body to it." (Not a
>> guitarist.)
>>
>> By the way if you just want some good guitar effects and don't want to
>> implement it yourself I suggest checking out Guitarix:
>> http://guitarix.sourceforge.net/
>>
>>
>> Steve
>>
>> _______________________________________________
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>> Stk at ccrma.stanford.edu
>> http://ccrma-mail.stanford.edu/mailman/listinfo/stk
>
>
>
> --
> Thanks,
> Robert Oschler
> Twitter -> http://twitter.com/roschler
> http://www.RobotsRule.com/
> http://www.Robodance.com/
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