fir1 1.3.0.4

Efficient FIR realtime filter

An efficient finite impulse response (FIR) filter class written in C++ with python wrapper.

The class offers also adaptive filtering using the least mean square (LMS) or normalised least mean square (NLMS) algorithm.

Installation

The preferred way to install is with pip:

pip3 install fir1

You can also install from source with python3 setup.py install:

git clone https://github.com/berndporr/fir1
cd fir1
python3 setup.py install

Usage

Realtime filtering

The filter is a realtime filter which always receives the values one by one so can process data as it comes in from an ADC converter. This is simulated here with the for loop:

import fir1
b = signal.firwin(999,0.1)
f = fir1.Fir1(b)
for i in range(len(noisy_signal)):
    clean_signal[i] = f.filter(noisy_signal[i])

The constructor Fir1(b) receives the coefficients and then filtering is performed with the method filter().

LMS adaptive filter

Please check the C++ code for examples and the main github page. The functions are identical.