Everything You Need To Know About Comb Filtering [with Audio Examples]
Vložit
- čas přidán 25. 06. 2024
- What does a comb filter sound like? What are the common causes of comb filtering? How do you eliminate comb filtering in a recording studio, mixing space, or live sound venue? In this video, you'll learn everything you need to know about comb filtering.
Full Post (Audio University Website): audiouniversityonline.com/com...
Download the free speaker placement guide here: audiouniversityonline.com/spe...
Acoustic Treatment (GIK Acoustics): www.gikacoustics.com/ref/121/
00:00 - What Is Comb Filtering?
00:31 - Introduction
00:44 - What Does A Comb Filter Sound Like?
01:57 - What Causes Comb Filtering?
02:11 - Comb Filtering From DSP Latency
03: 16 - Comb Filtering From Reflections
05:19 - Comb Filtering From Multiple Microphones
07:38 - Comb Filtering From Multiple Speakers
09:06 - Understanding Comb Filtering
09:15 - Comb Filtering Demonstration With White Noise
10:02 - Comb Filtering Demonstration With Sine Sweep
11:10 - Why Does Comb Filtering Happen?
12:26 - Comb Filter Frequency vs Delay
Book a one to one call:
audiouniversityonline.com/one...
Website: audiouniversityonline.com/
Facebook: / audiouniversityonline
Twitter: / audiouniversity
Instagram: / audiouniversity
Patreon: / audiouniversity
Gear Recommendations: kit.co/audiouniversity
#AudioUniversity
Disclaimer: This description contains affiliate links, which means that if you click them, I will receive a small commission at no cost to you. - Věda a technologie
I remember noticing, as a child (long before I'd heard of comb filters) that saying "sssshhh" while walking towards a wall produced an interesting sound like a passing jet plane. It occurred to me at the time, that I could use this to find the walls if I were ever in a room without any light. I used to practise by walking towards walls while making noise with my mouth... it was surprising to me at the time, how easy it was to stop right next to the wall before hitting it.
In fact this is the strategy for blind people to recognize obstacles, especially with clicking tongue sounds.
Kid memories are the best because you’re exploring the world with fresh eyes
I thought i was the only one acting that weird 😂
You are a very smart person
I wonder if bat's echo location is actually more like this than the classic pip and stopwatch view.
The professionalism and quality of his content tells me he is a subject matter expert. His youth, facial structure, and skin tone tells me I can purchase mushrooms off of him.
Dead. I died laughing. You killed me. Murderer. 💜💜
😂
Lmfao
Outrageous 😂
😂😂 let's listen to Pink Floyds dark side of the Moon in 8D😂😂 some songs are actually built into the floor the surrounds are play surround the room at different levels😅
I don't work with audio at all, but the way this guy talks and illustrates is phenomenal, I'm interested
OMG finally someone who knows what he is talking about. THANK you for making this most excellent and perfectly produced video. For years I have been fighting this rediculous idea of building center channel speakers with an array of drives positioned along a horizontal line under the TV. Everyone in the room other than the one person who gets to sit in the dead center will be experiencing comb filtering of the center channel material and that of course is mostly the human voice. Adding any type of distortion to the human voice is never a good thing. When I built my center channel speaker I susptended it vertically directly above the center of the TV aimed slightly down so it’s on axis with the average head height of the audience. This all but eliminates comb filtering. PLEASE do a video on this topic. You could really do it justice and perhaps enlighten the minds of people who think you just buy the speaker and place it under the TV. Thank you again for your great work.
Good idea, E! A video on horizontal vs vertical driver orientation is a great suggestion. Thanks!
Why not put one (or two) driver(s) above and one (or two) driver(s) below the screen? If drivers are not equidistant from heads, delay according to the average angle difference? Should create a phantom center right from the screen.
If projection screens are made from cloth or perforated, they put speakers behind 'em.
I am a high school student who just got my first paid gig for sound since people knew me for working with it for our live musicals/plays. Your videos have been wildly helpful for me since there is no one available to further train me on our sound system. Thank you so much!
Glad to read this! I hope the gig went well!
The accuracy of explanation in this video is just absurd. Excelent repetition of information, examples and overall quality. Thank you so much. Comb filtering occurs everywhere, it's so important to understand it. But it it also important not to be driven mad by it. This video covers it all.
Thank you!
Wow, I began as a free-spirited musician...now I'm turning into a neurotic audiophile.
This is an outstanding explanation.
Thank you, Texas Blues Alley! I'm glad you enjoyed it. Also, thanks for the shout out on FB. It means a lot to me!
i came here in search for a eurorack comb filter lol. now i have learned something about comb filters. i‘ll take it.
Best Channel on CZcams, your explanations are incredibly well organized, easy to understand and of course useful. Amazing job
Thank you!
I like bros energy, makes these tutorials way better. thanks man
Excellent ! Really clear explanations & practical demonstrations.
First video I've seen on this channel and the first video I've seen explaining the illusive Comb Filter. You good Sir just earned yourself a subscriber. Thank you.
Glad to hear that! Thanks!
Outstanding!!! This explains why the noise coming from a flying drone - recorded with a microphone on a tripod - sounds (and looks) much different than when it's recorded with a ground-plane microphone. Comb-filtering shows up because of the reflections coming off the ground, and using ground-plane microphones eliminates these reflections.
It's very illuminating to see how the comb-filter changes with respect to the time delay! Such a remarkable demonstration. Thank you!!!
Excellent. I hope your viewers appreciate how much work goes into explaining foreign concepts in such a clear and concise manner.
The simplest tutorial ever , subscribed.!!
Good speak! This is why when making recommendations on installed systems, my first option is a single speaker array that is dead centre. It shows in the acoustic simulation software. All too often center placement is not a feasible solution and so, we compromise by spreading the speakers to the left and right.
Have you checked out L’Acoustics L-ISA? I think you’d find it interesting!
best explanation on youtube, thank you! one thing i wouldve liked to hear more about though is the pattern of frequencies that get notched/cancelled by comb filtering at the end of the video and specifically why that is the way it is
Great suggestion. It also doesn’t help that I misspoke when saying the amount of time shift. Here is a calculator that you might experiment with: www.mh-audio.nl/Acoustics/FFR.html
@@AudioUniversity Thanks so much! That site is a super helpful practical tool for figuring out how comb filtering might be affecting my actual recording situations! Still trying to understand the actual pattern and all a bit more as far as how it mathematically unfolds (something to do with the harmonic series from what Im reading), but your video and that website are a huge help along the way! 🤜🤛
Very nice. I didn't understand it all, but that's the beauty of being able to watch it again and again until it sticks.
Glad you like it, @THOMMGB. Thanks for watching!
I am learning so much! Thank you
The best video i could find on this topic
Your videos are well explained
Thanks for providing quality videos for free
YES okay this just helped me solve the weird phase sounds I get from my high schools lectern that uses dual mics when someone moves closer to one or another. THANK YOU
You´re doing an amazing job, your videos are helping a lot of people right now. Thanks for your effort, im sure it'll pay off.
Thanks, Alejandro! I really appreciate your support.
Best explanation of this phenomenon I ever encountered. ♥️
Wow! Thanks, Joris!
Thanks so much - you are so clear and concise and easy to listen to that it makes understanding easy!
great explanation! gives me great input for my phd work. Thank you for your support!
Underrated channel..... So much useful content explained in a precise and proper way.. I am preparing for an exam and these are so useful... thanks man... cheers :)
Glad to hear that! Please share with your classmates if you think it would help them!
God evening sir. I am from Odisha INDIA. Sir I appreciate you explanation. It's very useful and outstanding . Thank you sir
Thank you for watching, Rajkishor!
excellent demos!! I never understood what comb filtering was. Great explanations and demonstration!! Thanks!!!!!!
You did an amazing job explaining in this video! Great examples and illustrations too. Thanks for creating such good content.
It’s worth it with comments like these, crawlkid. Thanks for watching!
very professional, much useful information
Thank you, now I understand the other side of Comb filtering. I use Comb filters on purpose for synthesis, like for physical modeling. This video taught me everything else I didn't know about Comb Filtering. much appreciated ...subscribed.
Glad to hear that, @Audio Artisan! Thanks for watching!
This is the university I had to graduated with! Thank you so much for your great work!
Excellent channel with pertinent data on the subject of sound engineering. Keep up the good work, your information is so relevant and important to managing sound.
Thanks, William!
Kyle: "Let me teach you how to avoid comb filtering."
Me: "Let me add a comb filter to my synthesizer patch and be in awe."
Great video Sir, insta-subbed.
Thanks, @Rayder Rich!
An absolutely great educational video, its clarity and simplicity are among the best in the entire CZcams. Many thanks and bravo! A couple of questions: Comb filtering effect happens naturally, it is caused by a phase shift between two copies of the same signal. How will the frequency comb look like with three or more copies at different delay times? And are there any comb filters built to process signal and when are they used? Thank you!
Multiple comb filters occur in every room. It yields a bunch of combs on top of each other. To see a graph, look at an acoustic measurement of a room.
Comb filtering is used in many many ways. One example in audio is flanger. However, as a few others have stated in the comments, comb filtering is also a tool in programming and computing!
You're amazing, Kyle.
10:10 volume down for that section…
thanks for this refresher… i was eager for the 3:1 rule part 7:04 … hehe
and thanks foe the guide. always useful, and really dl’d for support
I work in electronics a d what you are describing is a comb filter EFFECT, not a comb FILTER. A comb filter is used in signal processing to introduce destructive or constructive signal at the output by applying a delayed version of the original signal. So a filter is an actual variable delay line sometimes used in analog video processing foe time base correction.
What you describe is the comb effect that can be caused naturally as u described or by introduction of a delay as you did by shifting the audio signal also called phase shifting. Phase shifting can amplify or cancel out a signal such as in noise canceling headphones There it hears ambient sound with a microphone, phase shift it 180° and insert that sound into the audio stream. Thus cancelling the ambient sound signal. :)
Interesting distinction, Roy! Thanks for sharing your perspective on this and the extra info.
@@AudioUniversity your welcome. I only like to post positive comments that are helpful to others
This is literally why in my synthesizing process I tune my delay to about 000.5 secs, just to get that resonance from the comb filter. Thank you for explaining why.
Excellent subject, excellent explanations ! Just a small note : At 10:21 the delay is O.5 ms, not 5 ms. Otherwise the first cancellation would be at 100 Hz, not 1 KHz. The cancellation happens at half the period, which is 0.5 ms for a 1KHz signal having a 1 ms period. And at 13:12 the graph shows clearly a 0.0005 sec delay, which is 0.5 ms, not 5 ms.
This was clear and very helpful. Thank you for posting.
Thank you for watching!
Great video and explanation, thank you!!!
Listening to music =
1 - enjoying the music, the beautiful sensations it gives you;
Making music =
1 - enjoying the music, the beautiful sensations it gives you;
2 - enjoying the fact that you will offer the others the beautiful sensations that you love;
3 - enjoying all the complexity and all the beauty that goes into that beautiful final product.
The verbal economy of these lectures is a paradigm. He concentrates exclusively on the subject matter and has banished autobiographical and self-indulgent topics, both of which are a great temptation in a medium that has no material supply cost. In comparison, there is another CZcams channel, home stereo related, always with promising titles but whose contents are full of the word "I" and whose presentation and content is not distant from this-- search, "grandpa simpson onion on my belt."
This is the best explanation video!
Brilliantly explained Kyle thank you!
thank you alot, you explained it perfectly , greets from egypt
Brilliant explanation! Great work!
Sehr interessant und genau das was viele nicht wissen. Viele Lautsprecher, ein (unbenutzter) Equalizer und mächtig Lautstärke. Das allein zählt... es gibt halt viele Ignoranten.
My other hobby is Amateur (Ham) Radio. In radio communications, many transceivers have been touted as having comb filters as if this is a good thing, a feature, and found only on high end radios. Now I will have to go figure out how or what exactly they are using com filtering for and why it is a benefit.
To add to my last comment. This channel is absolutely effing amazing!!
Loved this video, keep teaching more stuff, so informative. Thanks.
I’m very glad to hear that you’re enjoying these videos. Thanks!
nice work. I am sharing this resource with my volunteers!
Fantastic explanation, thank you!
Wow, good thing I subscribed to you guys Audio University. Truly I’m learning a lot from you guys...thanks thanks thanks...nice presentation guys...it’s a A+ from me...
I’m really glad to hear that, Paul! Thanks for your support!
Thank you. I have seen videos on comb filtering, but none that explained/demonstrated it so well :)
Thanks!
Thanks for this explanation. Very useful info for those getting into audio recording. There's actually a lotta math--and history--behind this phenomenon... Christiaan Huygens, inventor of the grandfather clock, observed the (comb filtering) audio effect we now know as 'flanging' in 1693... Talk about 'back in the day'... That's even older than the Beatles, whose producer, George Martin, used tape-reel flanging!
Wow! That’s amazing! I had no idea the discovery of this phenomenon happened THAT long ago. Thanks for sharing, Carl!
This information is never going to be useful to me but I still enjoyed the video 😂
Glad you found it helpful, Jeff!
Thank you so much Bro
Dude, Seriously dont stop I beg you
Keep it up👌👌👌
Thanks, Allan! I appreciate your support.
It's super good thank you..
What a very interesting and informative series on the various aspects of sound reproduction. Much of it I had known years ago but age tends to restrict memory! Very well presented!
Glad you enjoyed it!
I loved this video it was crazy man great content
Always know the sound but didn't know what caused it and what it is called. Thank you so much, this is such a great video.
Glad to help, mura!
Really cool video, excellent examples.
I think that would be intetesting to make a video about Linear Phase EQ. Maybe talking about how EQ affects the phase of the input signal, or why it is important to use linear phase when equalizing.
Thanks, Leonardo! That’s a great suggestion.
I second that
5 second delay causing the same pattern of comb filtering in the sweep and white noise (i.e. 1Khz) is crazy. I'm gonna need a lot more absorption panels in my home studio. Thanks!
honestly these are so good I feel like I should be paying for this
Very clear and understandable. Good job!
Thanks, Rammstein Orchestra! Glad you liked it.
I already know all this, just wanted to say that this is an excellent video on the topic!
Thanks, eraser! I appreciate you watching and leaving a comment!
Good content and good explanations. Keep up the good work, Bless.
Thanks, Billy! Glad you like the videos!
Excellent video
Fantastic tutorial 👌👌👌
amazing video!
what a goldmine of a channel :)
Thanks! Glad you’ve found it!
My teacher makes comb filtering in supercollider and I never understood how it works. Now I do.thanks
Wow! That sounds interesting! Thanks, David. Glad to help!
As always - an excellent video -
Thanks, Thomas!
What an excellent explanation! Thanks man.
Thanks for watching!
super succinct, super informative, and with auditory/ visual demonstrations? and no spam?
THIS CHANNEL SMACKS
Great explanation, thank you
Glad you liked it, Peter! Thanks for watching!
Thanks! really needed this one!
I’m glad it was helpful to you, Bluehydra. Thanks!
So didactic! Thanks!!!
Excellent job.
Thanks, selbalamir!
Great logic
Great explanation
Thank you!
Thank you for sharing
Glad to help, Christopher. Thanks for watching!
You can also get comb filtering from thunder, jet flybys etc. from reflections off of the ground / surroundings, but in those cases it actually sounds good!
You're the best Kyle
Thanks, Akash!
Best on YT. I wish I were this good when I teach my students tech stuff !
Thanks, rayrecordings!
Great instructor!
Thanks, @bootlebeats!
Cool Man 😀 very interesting stuff, thanks
Vey important concept explained in a very easy manner. Liked and subscribed
thank you, kyle!!
Thanks for watching!
This is excellent.
Thanks, Rich!
Love you bro now i'm going to watch ur all videos 😋🤩
Thanks, Sagar! Glad you're enjoying the videos!
Sweet video
I've seen other videos like this but this was very well explained. Great job. This is the same thing as a phase shift, right? Thanks for a great and easy to understand video
Awesome!👍
Bravo! Awesome video :)
Thanks, @Acercandro!