Simple Lowpass and Highpass Filters with Python Implementation [AudioFX

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Hi, my name is Jan Wilczek. I am an audio programmer and a researcher. Welcome to WolfSound!

WolfSound's mission is to provide high-quality, informative, and entertaining videos, articles, and courses on how to process sound by exploring mathematics, applying algorithms, and creating code in various programming languages. Topics include sound synthesis, digital signal processing, programming languages for audio (C, C++, Python, Rust), and audio effects. I am also sharing tips on how to learn fast and effectively. Make sure to visit https://www.thewolfsound.com/.

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ABOUT THE VIDEO

In this video, I present allpass-based lowpass and highpass filter structures with real-time cutoff frequency control.

You will learn
💡 What is the problem with most IIR filter design methods when it comes to music applications,
💡 What are lowpass, highpass, and allpass filters,
💡 How can we use allpass filters to design real-time controllable lowpass and highpass filters,
💡 How to implement the resulting structure in the Python programming language.

In case of any doubt in understanding, please, refer to the article above or ask a question in the comments 🙂

Video edited by Vadzim Vezhnavets.
Background music composed and produced by Jan Wilczek in the Music Maker JAM app (https://play.google.com/store/apps/de....

ABOUT ME

My name is Jan Wilczek. I am an audio programmer, a researcher in the field of music technology, and a musician. Through articles and videos from WolfSound, you will easily understand the main concepts of sound processing using software. My full story:    • How I Got Started With Audio Programming (...  

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TIME CODES

00:00 Introduction
01:34 What is a lowpass filter?
02:07 What is a highpass filter?
02:26 The problem with most IIR lowpass & highpass filter design methods for music
03:15 What is an allpass filter?
05:37 Phase cancellation for the lowpass filter
06:21 Allpass-based lowpass filter structure explained
07:39 Amplitude response of the allpass-based lowpass filter
08:08 Cutoff frequency control
08:42 Allpass-based highpass filter structure explained
09:43 Amplitude response of the allpass-based highpass filter
10:19 Python implementation of the lowpass & highpass filter
14:57 Real-time controlled lowpass filter sound example
15:23 Summary

#python #dsp