No DigitalFilter.h. How can I download it?

[KMing-L]

fatal error: DigitalFilter.h: No such file or directory
#include "DigitalFilter.h"
^~~~~~~~~~~~~~~~~
compilation terminated.

[worldfigures]

Hi!

Did you find an answer to the problem?

Geting the same error message and can't find any information on solving the problem.

[KMing-L]

sorry,i didn't find it.