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1 pole lowpass filter

For general discussion related FlowStone

1 pole lowpass filter

Postby borodadada » Fri Jul 17, 2015 12:21 pm

Hello guys, i want create simple filter use site http://www.micromodeler.com/dsp/, but i dont understand how work parametr start freq 0 - 0.5
http://rghost.ru/7zqvqbL2L/image.png
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Re: 1 pole lowpass filter

Postby martinvicanek » Sat Jul 18, 2015 2:54 am

I have an article on filters at http://flowstone.guru/blog/digital-filt ... mechanics/ which you may find useful. You can also download a set of 1 pole filters here: http://flowstone.guru/downloads/first-o ... e-filters/ .
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Re: 1 pole lowpass filter

Postby borodadada » Sat Jul 18, 2015 9:02 am

In 1 pole LP filter.
Code: Select all
stage(0)
{
abs = 3.4e38|0.999999|0.1;
}

which means this line ?
Code: Select all
out  = ((out&abs) > 1e-11)&out;

and this
1e-11 ?
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Re: 1 pole lowpass filter

Postby martinvicanek » Sat Jul 18, 2015 12:08 pm

That is a way to prevent denormals, see viewtopic.php?f=4&t=2808#p14876
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