[sdiy] questions on string synthesizers

[Richie Burnett]

You could use an analogue formant filter bank (or digital IIR filter bank) to model the dominant resonant modes of an instrument's body. More bands makes for a more accurate model.

MATLAB for instance can design high order IIR filters which can approximate an arbitrary frequency response, presumably using something like least-square error optimisation. It's really just a matter of getting the poles and zeroes in the right place. 

-Richie,

Sent from my Xperia SP on O2

---- Ingo Debus wrote ----

>
>> Am 20.02.2017 um 08:32 schrieb Elain Klopke <functionofform at gmail.com>:
>> 
>> >I think they are essentially the same as old organs - the basic approach is to generate a square wave for each note, then optionally use a fixed filter (often just a resistor and a capacitor/inductor) to produce various different tones, then optionally combine those tones for each key to produce different timbres.  
>> 
>> Is there anywhere that shows what filter frequencies to use for what instrument? 
>
>Convolution is another option. You can get stunning results when convoluting a sawtooth with the impulse response of a string instrument’s body (violin, guitar, double bass…).
>
>Now, if there was a way to find out how to build an analog filter that sounds similar to a FIR filter with a given impulse response…
>
>Ingo
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