The Simplest Digital Filter (STM32 Implementation) - Phil’s Lab #92

How to implement a simple digital filter (low-pass and high-pass exponential moving average (EMA)) on a real-time 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 real-time time- and frequency-domain tests. [SUPPORT] Free trial of Altium Designer: PCBs manufactured and assembled by PCBWay: Patreon: Mixed-signal hardware design course: Advanced Hardware Design Course Survey [GIT] [LINKS] Instagram: [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 Low-Pass Filter Theory 08:36 Filter Coefficient Effect on Frequency Response (Alpha) 09:57 Software Implementation in C (Low-Pass) 13:11 Low-Pass Filter Real-Time Test 16:39 High-Pass Filter Theory 18:32 Filter Coefficient Effect on Frequency Response (Beta) 19:11 Software Implementation in C (High-Pass) 20:23 High-Pass Filter Real-Time Test 23:04 Outro