Bandpass & Bandstop Filters: Simplest Digital Design Ever? [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 bandstop (notch) and bandpass filter structures with real-time center frequency and bandwidth control.

You will learn
💡 What are bandstop, bandpass, and allpass filters,
💡 How can we use second-order allpass filters to design real-time controllable bandstop and bandpass filters,
💡 What is phase cancellation,
💡 How bandstop and bandpass filters differ from the band (peak, peaking) filter,
💡 What are the applications of bandpass and bandstop filters.

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.

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 Programm...  

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TIME CODES

00:00 Introduction
00:53 What is the bandstop filter?
01:28 What is the Q-factor and why do we use it?
02:18 What is the bandpass filter?
02:48 What do we need to implement bandstop and bandpass filters?
03:20 What is the second-order allpass filter?
03:50 Phase response of the second-order allpass filter
04:45 What is phase cancellation?
05:26 Allpass-based bandstop filter design
06:58 Bandstop filtering example (filter sweep)
07:29 Allpass-based bandpass filter design
08:45 Bandpass filtering example
09:02 Applications of bandstop and bandpass filters beyond just filtering
09:58 Summary

#filters #dsp