Phasing vs Flanging - Technical Breakdown (Part 2)
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- Опубликовано: 29 авг 2024
- Part 1: • Phasing vs Flanging - ...
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Part two of Eric Tarr’s two-part series on flanging and phasing modulation effects. The first video covered the difference between the two, and this one goes behind the scenes to show you how they both work.
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Hey guys, Eric Tarr for theproaudiofiles.com. This is my second video on the differences between phasing and flanging modulation effects. In my first video I looked at what each processor is doing to a signal. In this video I’m gonna look at how these effects are created - what’s going behind the scenes of the plugins to create these effects. I’m gonna be working inside of Pro Tools. I’ve synthesized a test signal to analyze.
I’ve started out with white noise inside the signal generator plugin and I’ve printed it onto a separate audio track. Then I’m feeding it into the iZotope Ozone 5 meter bridge plugin. I’ve got the spectrum and the spectrogram displayed. The white noise by itself looks like this.
[white noise via signal generator plugin]
It’s got energy across the whole spectrum from low to high frequencies. Let me talk about how the flanging effect is actually created. I’m gonna bring up some other tracks I’ve got going. I’ve got my original white noise printed onto this track but then what I did is duplicate it and I’ve got several different versions of the same track. If I zoom in at the sample level, you’ll see I’ve got the same signal on all these tracks. The only difference is I’ve shifted the original by 1 sample for each track. I did this to show you the way that a flanging effect creates this comb filter that sweeps across the spectrum is it actually uses very short delay times such that when it adds a signal with itself that’s been shifted by 1, 2 or 3 samples of delay, certain frequencies get cancelled. That’s how the comb filter gets created.
I’ve got the original flanging noise I’m gonna use here going through the Ozone plugin.
[white noise]
Watch when I bring in a signal, the same signal duplicated, but I delay it by one sample so there’s a one sample delay between these. The high frequencies get rolled off.
[white noise]
Right now we have a kind of spectral effect by actually using a time delay. If I mute the 1 for 1 sample and bring in the 1 for 2 samples, you’ll see there’s another notch. Now I’ve done a time delay, a very short time delay of that white noise signal and added it in with itself.
Next if I do a time sample of 3 samples of delay it looks like this. The notch is occurring at a different place than 2. And 4, 5, 6, 7 and 8 you can see what happens. So on a conceptual level how the flanger creates this kind of sweeping comb filter is to use very short delay times where it’s blending in together the original signal with one that’s been delayed by just 1, 2, 3 or a few samples and it modulates that. So rather than just sticking with a delay time of 1, 2 or 3, it actually moves between these different samples of delay and what that’s gonna do is shift where these notches occur across the spectrum. That’s how the flanging effect is created.
Let me show you how the phasing effect is created. I’ve got that same white noise signal printed. Then I duplicated it on a separate track. I’m gonna mix together the original signal with a version of itself. I’m gonna use a phase plugin from Waves called InPhase. It allows you to shift the phase of a signal at specific frequencies. For low and high frequencies I’m leaving the signal as it was. Zero degree phase shift. At 1 kHz, I’m gonna shift the phase by 180 degrees. I’m gonna take it out of phase so the frequencies are out of phase and have destructive interference with the original. If I show you the original, I’ve brought it up so I have the same number of samples of delay of internal processing, but I’ve got it turned off here. Then my second version of it, I’ve got the part at 1000 kHz where I’m doing the phase shift.
[white noise + Waves InPhase plugin]
What the phaser effect is gonna do is flip the phase of certain frequencies and then modulate the frequency so I can sweep it around and you can see how this sweeps across the spectrum.
[noise + Waves InPhase]
This is what’s taking place behind the scenes inside the phaser plugin. It’s gonna be doing it in a smoother way rather than stepping from one frequency to another, but the idea is you’re flipping the phase on certain frequencies and then adding them together so you have constructive interference with the two signals when they’re at zero degrees phase shift. And destructive interference where they cancel out just at these frequencies. That’s how a phaser effect is created.
Hopefully these videos have given you a good idea about the differences and similarities between phasing and flanging. 
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This is awesome. I love what's really going on to the signal with these filters we use everyday.
Thanks, Jimmy. These plug-ins do some pretty cool things.
how does a chorus fit into all this? is it just a straight line?
this was very helpful, haven't found something this clear explaining the signal processing happening behind audio effects! really appreciate it !
becaue of this tutorial, i now understand; how the two effects working on the sound. Gonna repay you by recommend your videos to someone else.
This video is awesome. I have wanting this exact information for awhile. Thank you. And thank you for presenting it so straight forward and easy to understand.
this is a very good explanation of how these ubiquitous modulation effects actually work, very eye opening. Thank you very much this a good video, along with the part 1
Thanks for your feedback. I am glad you found it helpful!
Eric Tarr always makes amazing videos with detail
Wow! Amazing in-depth explanations of what's going on with these 2 modulation effects that we're using quite often or that we heard (here thinking about guitar FX, or on some Hendrix's songs..) Thanks again Eric Tarr
Best video on this topic, thank you very much
I was looking for this video for a while, thanks !
What a brilliant presentation!
The problem is that different plugin companies use different modulations. Some shift phase some shift pitch and some shift filters...
Very cool and unique tutorial. keep them coming :)
Thanks for your feedback, Patrick.
very informative video. couldnt have been better
Really nice
so apart from this,when we create a notch filter in an equalizer,what happens there? i mean behind the scene the eq is creating another version of audio and give it a delay or just simply flip the phase of the chosen frequancy?
thanks for great info.
A masterful lesson. Thank you for illuminating me. =]
my hero
Am I right by saying phasing and flanging are just other ways of EQing and automating EQs?
That's correct. Many effects (flanging, phasing, eq, filters, etc) are all based on using very short time delays. Depending on how you choose the time delays, you can end up with different results.
thank you so much, that's usefull
great video
Great explanation!
Quick question tho, why do the time & phase shifts also seem to slightly attenuate the frequencies either side of target frequencies?
Is there a way of adjusting the steepness of these notches?
great tutorials!!
Thanks for watching!
So when people take 2 mono vocal tracks and delay one by a few milliseconds to create space using haas effect does that also create a notch in certain frequency's like the Flanger effect you got from delaying the printed white noise by a few samples?
Yes! That is is absolutely the case. Your idea will create the perception of "space," but it will create notches in the spectrum like the flanger effect.
To an extent. Normally the two vocal tracks are panned left and right though, which reduces the perceived phasing
thank you very much.
I still don't get it. What's the difference in how the two effects are created? It sounds like both are about duplicating a signal & having a small delay between the two, then the delay time is lengthened & shortened, as the copied signal moves back & forth. There must be some difference in what happens for each effect. (I know about phase cancellation).
Perfect!
Thank you
Thanks a lot.
Here's part two of Eric Tarr's Phasing vs Flanging tutorial series. This one is a technical breakdown of what's going on behind the scenes.
Part 1: ruclips.net/video/Ici_YOVDl_0/видео.html
Can someone explain that if I mix a signal to the original one sample later, why does it cancel out a part of the spectrum? I'm an electric engineering student, but shame on me, I can't figure this out.
Might be easier to see with sine waves. Most of the signal will have constructive interference, while a small band will be at odds and cancel.
muy bueno gracias wacho, entendi
super.
i wish a practical use of these effects had been demonstrated
Ok, and what is a phase? Not much information here.
I disagree that the plugin you're using for the phaser is inverting the phase here, since the frequency meter is simply showing a notch, which means all the plugin is doing is scooping the frequency as you move it along on the plugin interface. This is not inverted phase and it doesn't sound like it either, since you can clearly hear the notch being moved.