Filters in C

• electronic design:Use Software Filters To Reduce ADC Noise
  • Feedback filter is IIR
• stackoverflow: lowpass and high pass filter in C#

• stackoverflow: Low pass filter software?
• A C++ library for IIR filter
• github: vinniefalco / DSPFilters
• gnuradio

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• Averages/Simple moving average

IIR

• Stanford: Definition of the Simplest Low-Pass Read this first to understand that z-1 is the previous value
• wikipedia: Infinite impulse response

University of York

• Butterworth / Bessel / Chebyshev Filters CALCULATOR PRODUCES ANSI-C
  • Check the graph, response is calculated upto 1/2 of normalized sampling frequency
• more filters
• Same calculators also in this site Jayduino
• For passive filter York calculator go to Passive filter calculators

Cornell

• Digital Filtering for Atmel Mega32 (Version 2) - Cornell University

Atmel

• AVR223: Digital Filters with AVR