How to Implement an FIR Filter in C++ [DSP #15]

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

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ABOUT THE VIDEO

In this video, I show you how to implement a plain (unoptimized) FIR filter in C++.

Learn how to
💡 Rewrite the FIR filter convolution formula,
💡 Pad the signals with zeros correctly, and
💡 Implement it in C++.

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.

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TIME CODES

00:00 Introduction
00:22 What is an FIR filter?
00:53 Mathematical definition of convolution
01:33 Practical convolution formula
02:08 How to pad the input signal with zeros?
03:38 FIR filter implementation
06:41 FIR filtering test
07:34 Summary

#dsp #cpp

[MoXyiD]

Good shit bro! I needed to get re-upped on my convolution and you provided GREAT easy to understand (from an engineers perspective) content.

[asthasingh]

Thanks for putting this up! Great help😊

[alexeykononov]

very thorough explanation, thanks 👍 I wish you well in your marketing agenda (it is much more complex than FIN Filter in C++ I presume 🤣)

[MatkatMusic]

Why not use std::vector instead of raw C-style arrays?

[nickst]

Thanks! Can you do an IIR tutorial as well?

[robc]

Interesting that you used the sound response of a room to somehow make the music match. I think this needs a more generalised explanation because most non DSP mathematicians won't have understood IMO :)

[AndriiAndrosovych-ue]

Hello! Does it make any sense to write it in assembly? Will we have any increase in performance or will this task be too complex and difficult?I mean standard x64 architecture - a usual laptop (not DSP or MCU)

[isaiahclemons]

If I wanted to create an FIR low pass filter at a specific frequency how could I change this code to implement a desired corner frequency?

[athuldas]

How are u implementing sound with the code please can I know this is not domain i am intrested please any one ???

[sadewosat]

Can you explain Hilbert transform in c++ too?

[danmiller]

Super helpful video thank you very much!!

[farhatibrahim]

Also it is a fundamental filter for Video coding ;)

[bigmistqke]

Damn, that's a pretty crazy result for such a simple filter. I am a bit puzzled how we get from the impulse response to the coefficient list (dsp noob here), but will look into your code to figure out those details.

[heddshot]

6:58 I thought you were playing Nokia ringtone