All Pass Filter Explained In 1 Video: The Ultimate DSP Tool [AudioFX

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Hi, my name is Jan Wilczek and 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 www.thewolfsound.com/.
WolfSound enables everybody to learn about audio programming!
In this video, we are discussing digital all-pass filters. You will learn:
✅ what is an all-pass filter,
✅ what are the types of all-pass filters,
✅ what is their phase response,
✅ what are their applications in digital signal processing, and
✅ how to implement them.
I apologize for the audio quality in this video: no fix in the mix could correct the recording errors. I hope you'll understand 😉
In case of any doubt in understanding, please, refer to the article above or ask a question in the comments 🙂
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...
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TIME CODES
00:00 Introduction
01:00 Video outline
01:33 All-pass filter definition
02:20 FIR all-pass filter
03:08 First-order IIR all-pass filter
04:15 Phase response of the first-order IIR all-pass filter
05:51 First-order IIR all-pass filter applications
06:03 Recap of first-order IIR all-pass filter properties
06:39 Second-order IIR all-pass filter
07:15 Phase response of the second-order IIR all-pass filter
08:24 Second-order IIR all-pass filter applications
08:35 Second-order IIR all-pass filter properties summary
09:05 Higher-order IIR all-pass filters?
09:33 Summary
#dsp #filters

Опубликовано:

14 июл 2024

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Комментарии : 39

@WolfSoundAudio 2 года назад

Have I helped you with this video? If yes, please, consider buying me a ☕ coffee at www.buymeacoffee.com/janwilczek Thanks! 🙂

@CatFish107 9 месяцев назад

I would buy a coffee for someone who does not use white text on a white background, with only a thin outline of the letters for contrast.. No coffee for you. Garbage sound quality too.

@velvetsound 2 года назад

I’d recommend some sound treatment panels for your walls. It’ll improve your audio quality immensely. Good content, just hard to understand with the audio recording issue.

@WolfSoundAudio 2 года назад

Hi, Jason, thanks for the feedback! Too bad I'm not in Finland anymore :) Cheers!

@gurratell7326 5 месяцев назад

Or at least move the mic closer for more direct sound and less indirect.

@willdryer1625 Год назад

super cool video, this had some amazing information in it. you rock and i hope you never stop teaching the world

@RotansMusic 2 месяца назад

Thank you man, I'm learning Waves Inphase plugin and i was not understanding the All pass filters. Through this video i did not understand completely, but now i have some kind of little idea of that. It's not your fault. I would like to give suggestion too, consider using some more easy graphics please, the equation part was complicating for me. By the way you know what is right for the video. Thank one more time.

@JazzInATinCan Год назад

I'm sorry, but I have a hard time not focusing on the sheer amount of real cool and heavy titles in your bookshelf. Oh and forgot this: Thanks for the time and effort!!

@petrparizek9945 Год назад

Thanks for the detailed explanation. The only thing that I'd love to be added is some sound examples of comparing unfiltered and filtered sine sweeps. Suppose that the left channel of your recording would contain an exponential sine sweep of 10 seconds in length while the right channel would contain the same sine sweep filtered with the allpass filter that you're talking about (assuming both sine sweeps would be aligned in time with single-sample accuracy). Or, let's say that when you talk about the allpass filter being actually a convolution of some two other filters (I think you said something like this there), again, I'd love to hear a sine sweep being run through each of them (on one channel, while the other channel would contain the unprocessed sweep). This would help people like me who are used to mentally converting (sometimes pretty quickly) sound to maths or maths to sound. I do these conversions almost on a daily basis as I'm interested in things like tunings and microtonality and non-standard scales and new harmonic systems and all that stuff, so I switch from ratios to cents or from cents to ratios pretty often.

@baghdadiabdellatif1581 4 месяца назад

Thank you

@prtysh 2 года назад

This is very cool to see, thank you :)

@WolfSoundAudio 2 года назад

Thank you for the feedback! :)

@cowbless Год назад

Thanks for such a comprehensive explanation and directions for further study! I am learning Bitwig's Grid, and allpasses are a big part of making reverbs, apparently, so I wanted to make sure I understand what they do!

@WolfSoundAudio Год назад

Thanks for sharing, that's great!

@GeorgeLocke 2 месяца назад

Bitwig finally added a proper allpass grid module. That's what brought me here.

@loidis9347 2 года назад

thank you

@WolfSoundAudio 2 года назад

You're welcome! :)

@ndrstrl1142 10 месяцев назад

Good tutorial! I came across a different formula for the first order allpass: w = abs(fb)*2Pi/fs ; a1 = (sin(w)-1) / cos(w) ; ... that only seems for first order though, but maybe it’s just a different way to the same place

@dendriloquist Год назад

your video is amazing. absolutely essential to learn for DSP, . could you reproduce this video with a lavalier or directional mic. you are giving out such good info that it would be bad that people would not listen or stay on the video because of bad audio. anyway. thank you so much for this.

@fano72 Год назад

Allpass Filters are strange species. Thanks for the good explanation. Will make some Java experiments with them.

@jeyko666 Год назад

thanks, great video, i find the audio fine actually 🤷‍♀. i'm having 0 trouble understanding you

@WolfSoundAudio Год назад

Great!

@1over137 Год назад

i assume you use this by then adding the signal to it's pre-all pass filter self, such that the phase will cancel or construct based on teh phase.

@beyondhelp 2 года назад

The true question: are all those textbooks yours? Additionally, have you read them all?

@WolfSoundAudio 2 года назад

Haha, I have read some of them but not all :) These books are the property of the Aalto Acoustics Lab and I happen to record the videos in their mini-library. There's a funny story behind these books though; while I was studying, I was puttig together a list of books in audio and programming I would like to own or read. When I arrived at the Acoustics Lab, I saw that all those books were already there in that one room... It was like visiting Honeydukes from Harry Potter :)

@przekladanki 2 года назад

Sound is not great but video still interesting ^^

@WolfSoundAudio 2 года назад

Yes, I apologize for the audio quality; One can never stop learning...

@JazzInATinCan Год назад

If all this math is too much for me, where do you suggest I go? I know basic decreete math for computer science, but this seems just a step more advanced.

@JohnJTraston Год назад

You talk about sound filters with a lot of hand motion and zero, ZERO audio example. Amazing.

@magnuswootton6181 Год назад

there is analogue filters, then digital filters, then back to an analogue filter which does the digital maths in analogue with comparitors!!!

@RokSivante 2 года назад

holy shit. I used to be exceptionally good at math & physics 20 years ago in high school, but this just makes me feel DUMB now. 😹 off to look for the "for dummies" version to figure out exactly what the all-pass filter in Volcano 3 does...

@WolfSoundAudio 2 года назад

Oh, sorry... That wasn't meant to sound complicated 😕 I have not dealt with Volcano 3 so I cannot help there. I hope you'll find your solution!

@RokSivante 2 года назад

@@WolfSoundAudio lol. No worries. I’m sure this is is fantastic for a mathematical/physics approach to it, though was just looking for something basic and kinda dumbed down more pertaining to the practical application of how it sounds. Mighta found something else though sorta forgot already, just resorting to playing/experimenting and learning that way - which is often the best route anyways 🙂🥂