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ZoltzerFilter1_2

Question asked by izhmel on May 1, 2016

Good day,

How can I use a potentiometer to control the Zoltzer  or the NF Filter in the sigmastudio ? , I want to use an external    potentiometer to make adjustments  to Gain , Frequency , Q using the auxiliary ADC GPIO

 

 

Thanks in advance

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KJBob

 

 

KJBob  (to Hopeton Brown) 3 weeks ago

 

 

     Hello,

 

     For GPIO control you would need filters with control input "pins."  Unfortunately, the only such filters presently available are the State-Variable filters, which are unsuitable for general EQ application.

 

     Up to now, SigmaStudio has not included external-control EQ filters because their bilinear coefficient calculations are rather complex to do at runtime inside the DSP.  However, the -1452 could change all this.  In fact, I just noticed in Beta version 3.12.4,  a  filter featuring runtime coefficient calculations!

 

Calc-Filter.png

     Since this is arguably the most difficult portion of the work needed for a General Second-Order filter with external inputs, perhaps such is on its way (of course I'm only speculating...).

 

     Yet this is still not what you're asking for (Zoltzer or NF filter).  Honestly I have no idea what these are.  Perhaps I could ask you what a Zoltzer filter is, and what advantages it might have over other filters.

 

 

     Best regards,

 

     Bob

 

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Hopeton Brown

Hopeton Brown  (to Hopeton Brown) 3 weeks ago

Look under custom algorithms./ second order 

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