filter-c

Elegant Butterworth and Chebyshev filter implemented in C, with float/double precision support. Works well on many platforms. You can also use this package in C++ and bridge to many other languages for good performance.

Features

• lowpass
• highpass
• bandpass
• bandstop

This imlementation is based on algorithm from https://exstrom.com/journal/sigproc/dsigproc.html

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).