How to implement a simple digital filter (lowpass and highpass exponential moving average (EMA)) on a realtime embedded system (STM32 + audio codec). Useful for noise reduction, removing DC offsets, and more in simple situations.
Discussion on filter basics, advantages & disadvantages, theory, implementation in C, and realtime time and frequencydomain tests.

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[TIMESTAMPS]
00:00 Introduction

00:44 Altium Designer Free Trial

01:15 What We'll Look At
01:47 EMA Filter Basics
03:40 Digital Filter Basics

05:03 LowPass Filter Theory
08:36 Filter Coefficient Effect on Frequency Response (Alpha)
09:57 Software Implementation in C (LowPass)
13:11 LowPass Filter RealTime Test

16:39 HighPass Filter Theory
18:32 Filter Coefficient Effect on Frequency Response (Beta)
19:11 Software Implementation in C (HighPass)
20:23 HighPass Filter RealTime Test

23:04 Outro