In this video, we'll subject an impulse signal through a first order feedback filter to get an impulse response, and we'll see why this response is called an infinite impulse response and what makes a filter unstable. We'll then briefly talk about the zeros and poles of a filter, and make a simple modification to create a p-z filter. We'll end the discussion with the advantages and disadvantages on an IIR filter.
Find the full playlist here: https://www.youtube.com/watch?v=Qmd685msY-Y&list=PLbqhA-NKGP6Afr_KbPUuy_yIBpPR4jzWo
Content:
0:00 Impulse response
4:42 Poles and zeroes
8:41 p-z filter
9:27 Direct form 1 and 2
10:23 Bi-quads / Advantages
13:02 Disadvantages
Repository:
https://github.com/Thrifleganger/filter-basics
References:
Designing Audio Effect Plugins in C++, Will C. Pirkle -
https://www.willpirkle.com/about/books/
Digital Filters: A Practical guide, David Dorran
http://dx.doi.org/10.13140/RG.2.2.26017.48486
In this series on Digital Filter Basics, we'll take a slow and cemented dive into the fascinating world of digital filter theory. Many resources present this topic with dense and exhausting mathematics. Although a fair understanding of complex mathematics is required to fully comprehend the science of filter design, understanding the basics of filters and how they fundamentally work is better left to analysis and visualizations, which I try to do in this series. We'll learn about feedforward and feedback filter topologies, impulse and impulse responses and and wide variety of other topics.
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A lot of time was spent on creating this series, and I plan to do more. So please consider subscribing if you wish to be notified about more releases in the future. And if you feel generous: https://www.patreon.com/akashmurthy
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Check out the audio track in the intro and outro here: https://soundcloud.com/thrifleganger/tinderbox
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