filter-c

Butterworth and chebyshev [lowpass, highpass, bandpass, bandstop] filters implementations in C.

based on algorithm from http://www.exstrom.com/journal/sigproc/

Run example

make example
./example

Steps to use a filter,

1. Create a filter object using create_***_pass/stop(params...)
2. Use filter to filter incoming numbers one by one. The output is a double or float that can be specified in header.
3. After using the filter, release the filter using free_***_pass/stop(filter).