Time and frequency domains

  Рет қаралды 100,583

Mike X Cohen

Mike X Cohen

Күн бұрын

Пікірлер: 152
@electric_sand
@electric_sand Жыл бұрын
Clear voice, clear images, clearly explained. Thank you.
@bulbulroyagarwal9647
@bulbulroyagarwal9647 4 жыл бұрын
The search ends.. Finally an Excellent explanation of the concept with total clarity. Thanks a lot!
@mikexcohen1
@mikexcohen1 4 жыл бұрын
And now my search for the best KZbin comment has ended! We may both go in peace ;)
@MeistroJB
@MeistroJB 3 жыл бұрын
I sure hope so. Shouldn't take me that many more decades.... Omg! seven minutes in, it's true! Can't thank you enough.
@userhdza2248
@userhdza2248 3 жыл бұрын
i can confirm that i was looking for so long to know the use of spectrum untill setteled here
@OmniTraders
@OmniTraders 2 жыл бұрын
What will this help exactly
@tidytelz
@tidytelz Жыл бұрын
It is actually the best explanation I have seen so far.
@denisjoly4300
@denisjoly4300 4 жыл бұрын
Thanks for the clarity of your explanations! I have to agree with other comments : you give the best lectures on signal analysis I've seen so far!
@mikexcohen1
@mikexcohen1 4 жыл бұрын
awww, thanks!
@a.b3203
@a.b3203 2 ай бұрын
Mike Cohen and Mark Newman. The saving graces of any learner. Good stuff mister 👍🏻👍🏻.
@Yalsha
@Yalsha 4 жыл бұрын
You are one of the best in the KZbin to explaining frequency. thank you for your effort
@mikexcohen1
@mikexcohen1 4 жыл бұрын
You rock, Yasser!
@gregoryacacia8087
@gregoryacacia8087 9 ай бұрын
Thank you so much that was so clear !! We have hours of courses in university and still understand nothing, but here with a 10 min videos everything is cristal clear !! Wonderful job
@mikexcohen1
@mikexcohen1 9 ай бұрын
Glad it helped!
@mvelisompukuzela9034
@mvelisompukuzela9034 2 жыл бұрын
You really made this easy, thank you. I was struggling with understanding these two domains but now the light is there.
@mikexcohen1
@mikexcohen1 2 жыл бұрын
Thank you kindly, Mveliso. I'm glad you found it useful.
@jsmithtraveller
@jsmithtraveller Жыл бұрын
Thank you. I hope that conveys how much I appreciate you tutorials.
@mikexcohen1
@mikexcohen1 Жыл бұрын
Thanks! I'm glad you've found them useful.
@johnrogers1251
@johnrogers1251 3 жыл бұрын
In under ten minutes, along with clear pictures and verbal descriptions, you have removed the mystery (to me) of understanding the how/why/what-is-it-useful-for of Fourier transforms. I also appreciated that on the last slide, you explained the three things a student must be familiar with to do Fourier analysis (sine wave, complex numbers, dot product), and showed how the three things are combined to reach the end goal of Fourier coefficients. Thank you, and I look forward to watching your videos as I self-educate!
@mikexcohen1
@mikexcohen1 3 жыл бұрын
Awesome, thanks John :) I hope you find the rest of my videos just as useful!
@johnrogers1251
@johnrogers1251 3 жыл бұрын
@@mikexcohen1 I bought your course on Udemy, so I will give an assesment on the usefulness/understandability throughout the course. Overall, my goal in taking the course is to gain a better appreciation for signal processing.
@dakynshew4163
@dakynshew4163 4 жыл бұрын
you r one of the top teacher ive met,now frequency domain is sooo clear ..iv searrch for many youtuber to make me understand it n i found none but only u sir.......people should watch your videos to clear thei concept......you r the first youtuber where i memories the channel name.......keep it up sir
@mikexcohen1
@mikexcohen1 4 жыл бұрын
Happy to help!
@razor1887
@razor1887 4 жыл бұрын
I have been searching for a month. I can finally get an intuitive idea. Really appreciated!
@hishamtariq7054
@hishamtariq7054 Жыл бұрын
Thank you very much for providing a concise and informative explanation.
@roymccormick5328
@roymccormick5328 2 жыл бұрын
Thank you very much for this extremely clear and helpful series of over 17 videos explaining the Fourier Transform from basic concepts. so super cool 😎
@mikexcohen1
@mikexcohen1 Жыл бұрын
Glad it was helpful!
@knightx9405
@knightx9405 Жыл бұрын
i gotta tell you for doing this video that, you are the definition of "Inner peace", at this moment :)
@mikexcohen1
@mikexcohen1 Жыл бұрын
If you can't fall asleep at night, try playing this video :P
@sourabhkay
@sourabhkay 2 жыл бұрын
Give this guy a medal!
@mikexcohen1
@mikexcohen1 2 жыл бұрын
Thank you, kind internet stranger.
@joseph13058
@joseph13058 Жыл бұрын
The best explaination I've seen of this so far.
@mikexcohen1
@mikexcohen1 Жыл бұрын
Thanks :)
@TravisTerrell
@TravisTerrell 4 жыл бұрын
This is so clearly explained! Thank you!
@jurikang6731
@jurikang6731 9 ай бұрын
I finally understand why FT is used!! Was really lost in my digital image processing course for a while. Thank you for such a spectacular explanation, you're amazing!
@mikexcohen1
@mikexcohen1 9 ай бұрын
Awesome :)
@yaminobia7159
@yaminobia7159 Жыл бұрын
I am doing a math ia on this topic and this video is extremely helpful and easy to understand. Thank you so much
@mikexcohen1
@mikexcohen1 Жыл бұрын
Glad it was helpful!
@carlosvillarreal1933
@carlosvillarreal1933 2 жыл бұрын
Hi, I use wavelets and Hilbert transform methods to analyze sea wave data for my Ph.D. in oceanography. Your videos and your book are really helpful. Thanks for your work
@mikexcohen1
@mikexcohen1 Жыл бұрын
Thank you, Carlos. I'm glad you're finding these useful.
@ДеянЦонев-ы7в
@ДеянЦонев-ы7в Жыл бұрын
Sir you are born to be a teacher ! I have follow your courses in Udemy and they are wonderfull too!
@mikexcohen1
@mikexcohen1 Жыл бұрын
Thank you kindly, user-hg1mn3qo8x.
@tubarekolah1786
@tubarekolah1786 4 жыл бұрын
Finally, I can stop my search on this topic bcos I've got it
@mikexcohen1
@mikexcohen1 4 жыл бұрын
Now you make me blush :D
@DavidClendenen
@DavidClendenen 2 ай бұрын
Finally, a clear explanation. Thank you!
@mikexcohen1
@mikexcohen1 2 ай бұрын
Glad it was helpful!
@hparvizi
@hparvizi 3 жыл бұрын
FINALLY UNDERSTOOD this basic concepts. well done. thank you
@mikexcohen1
@mikexcohen1 3 жыл бұрын
Awesome ;)
@bonjour5651
@bonjour5651 7 ай бұрын
Thank you so much!! I was trying to find a source to understand the difference clearly. You are awesome! I appreciate.
@mikexcohen1
@mikexcohen1 7 ай бұрын
No, *you* are awesome!
@isaganicomia4958
@isaganicomia4958 2 ай бұрын
Thank you, this is the explanation im looking for quite sometime.
@bugraaksu1252
@bugraaksu1252 3 жыл бұрын
Wonderful explanation, brief, clear and simple. Lot of thankss..
@mikexcohen1
@mikexcohen1 3 жыл бұрын
Awesome, I'm glad you found it useful.
@jasonstarr2036
@jasonstarr2036 2 жыл бұрын
Finally, a very clear explanation! Thank you for posting!
@mikexcohen1
@mikexcohen1 2 жыл бұрын
:)
@bhupiistersingh4097
@bhupiistersingh4097 3 жыл бұрын
Great way to explain both the domains.
@Ranjit4uy2k
@Ranjit4uy2k 4 жыл бұрын
Nice way presented the Noise, which i struggled before to understand. One Question... 1. In nose induced signal, time domain max amplitude goes to ~5. But frequency domain is 1. Could you clarify plz?
@mikexcohen1
@mikexcohen1 4 жыл бұрын
I'm not sure which graph you're referring to, but the time domain signal is a combination of all frequencies. Noise is a good example of the advantage of the frequency domain, because noise amplitudes might be smaller in the frequency domain than in the time domain.
@Ranjit4uy2k
@Ranjit4uy2k 4 жыл бұрын
@@mikexcohen1 This Clarified my query. Awesome explanation dude. Now I understand the FFT.
@wasilwestside
@wasilwestside Жыл бұрын
Hi Mike, I hope you are well. Absolutely beautiful way to explain the process, very impressive. Keep up the good work
@mikexcohen1
@mikexcohen1 Жыл бұрын
Thank you kindly, Wasil.
@Ayoub.Naderei
@Ayoub.Naderei 14 күн бұрын
the way you teach and also your contents are amazing :)))))
@mikexcohen1
@mikexcohen1 12 күн бұрын
Thank you! 😃
@unknownworld177
@unknownworld177 3 жыл бұрын
Thank you, you are great on this subjects. keep educating us
@mikexcohen1
@mikexcohen1 3 жыл бұрын
Will do! Thanks!
@saraghorbani70
@saraghorbani70 3 жыл бұрын
It was so beneficial to me, and the explains were so clear, but you pointed out why the amplitude is half of the distance between throughs and the peaks. Could you please explain that?
@mikexcohen1
@mikexcohen1 3 жыл бұрын
Thank you, Sara, that's nice to hear. The answer to your question is in my playlist NEW-ANTS#2, don't remember offhand which video exactly.
@Christian-rf5zv
@Christian-rf5zv Ай бұрын
thank you for such a great and informative video!
@sukursukur3617
@sukursukur3617 4 жыл бұрын
Can we say that: fourier transform is a crosscorellation of a time dependent function with sine or cosine function for different frequencies.
@mikexcohen1
@mikexcohen1 4 жыл бұрын
Hmm, I would use that description for a wavelet analysis. The term "cross-correlation" means to repeatedly shift one signal relative to the other. The Fourier transform is better thought of as the correlation (not cross-correlation) between the signal and a set of sine waves. The correlation has two normalization factors that the Fourier transform doesn't have, but otherwise it's a good analogy.
@MGYTRAVELLER
@MGYTRAVELLER Ай бұрын
Thank you for the clear explanation!!!
@imaginer04
@imaginer04 4 жыл бұрын
A nice explanation with most clear concept.
@muhamadariefhidayat1914
@muhamadariefhidayat1914 2 жыл бұрын
thank for the clear explanation. i wonder how to interpret frequency domain in 2D. like image. each row in image can be interpreted like your explaination. but as we know that image contain many rows. how we can visualize frequency domain of many rows. in addition images have columns too. thank you
@salmanjamil1248
@salmanjamil1248 2 жыл бұрын
Wow! Excellent explanation!
@mikexcohen1
@mikexcohen1 2 жыл бұрын
Glad you liked it :)
@ginmarx6104
@ginmarx6104 Жыл бұрын
thank you ! easy to understand and visually striking !
@christianleyva3166
@christianleyva3166 26 күн бұрын
Excatly what I needed, thank you.
@lolo-cz3yk
@lolo-cz3yk 3 жыл бұрын
Search ends
@shoebshaikh1790
@shoebshaikh1790 Жыл бұрын
This is pure gold ❤
@mikexcohen1
@mikexcohen1 Жыл бұрын
@nasrink2086
@nasrink2086 3 жыл бұрын
Very great explanation. How we can convert from the time domain to the frequency domain in MATLAB? I used the following code to convert data from time domain to frequency, but the plots in the frequency domain are totally different from what I see in this video and I can not get information from them. This is the code: %% Compute the Fast Fourier Transform FFT of the refrigerator dt=.001; n=length(ref(9906:31449)); fhat=fft(ref(9906:31449),n); % Compute the Fast Fourier Transform PSD=fhat.*conj(fhat)/n; %Power spectrum (power per frerquency) freq=1/(dt*n)*(0:n); %Create x-axis of frequencies in Hz L=1:floor(n/2); %Only plot the first half of freqs figure; plot(freq(L),PSD(L)) title('FFT')
@lohithh9253
@lohithh9253 3 жыл бұрын
Wow..... What an explanation that is. Clear. Thanks a lot.
@arshadhussain734
@arshadhussain734 3 жыл бұрын
Crystal clear explanation! Thank you
@aminechniouel1418
@aminechniouel1418 2 ай бұрын
why do you count the picks and not the periodes of the signals ? thank you for the videos
@mikexcohen1
@mikexcohen1 2 ай бұрын
You can also do that. I just counted the peaks to illustrate the concept.
@jaivalani4609
@jaivalani4609 3 жыл бұрын
Thanks Mike this clearly explained . Can it happen Noise Amplitude starts dominating sinosodial waves meaning SNR
@mikexcohen1
@mikexcohen1 3 жыл бұрын
Cleaning noise from a signal can be trivial, difficult, or impossible, depending on the nature of the signal and the noise. So there isn't one specific strategy that always works. But if the signal and noise have different spectral signatures, then filtering (e.g., FIR filters) is usually pretty successful.
@barbiliandan
@barbiliandan 12 күн бұрын
Great video :-) thanks. Something is not clear for me. In the third picture (time domain) if I count how many "big" peaks there are i will observe tgere are only 2 large peaks until 1sec, therefore I could not understand why in the frequency domain for the third picture the we still have some information when freq = 5Hz. Thanks!
@mikexcohen1
@mikexcohen1 10 күн бұрын
Great question :) The two frequencies actually cause some interference patterns, which causes the other features you see, like some peaks seem "lower" while others are "higher." It's another example of how signals get mixed in the time domain yet are easily separated in the frequency domain.
@Mulkek
@Mulkek 3 жыл бұрын
Thanks, and it's so easy & simple!
@frinikarayanidis4
@frinikarayanidis4 4 жыл бұрын
Fantastic resources, thanks Mike!
@mikexcohen1
@mikexcohen1 4 жыл бұрын
Thanks Frini!
@ckguleria7
@ckguleria7 2 жыл бұрын
finally I know what these frequency graphs tell...
@mikexcohen1
@mikexcohen1 2 жыл бұрын
Nice ;)
@ErikaBeatrizDelgadoZhagui
@ErikaBeatrizDelgadoZhagui 5 ай бұрын
Thank for such as great explanation!!
@mikexcohen1
@mikexcohen1 5 ай бұрын
Glad it was helpful!
@salihaamoura232
@salihaamoura232 4 жыл бұрын
شكرا جزيلا لك thank you very much :)
@ComputerScienceLessons
@ComputerScienceLessons Жыл бұрын
EXCELLENT!!!
@Ranjit4uy2k
@Ranjit4uy2k 4 жыл бұрын
One More Question-- I am in a way to convert a random road load data to PSD graph for FEA simulation. Could you help me understand the physics involved to simplify the data in frequency domain. Also need to understand the role of Gaussian or PDF in the algorithm!
@MrMec09
@MrMec09 9 ай бұрын
Thank you, it help me here!
@kmsrog
@kmsrog 2 ай бұрын
hi, is there a difference in sound? i saw ifi ad from their dongle, instead of frequency domain they manipulate the time domain. sorry i don't understand any of your explanation(i am on health sector). thank you if you ever read and answer this.
@KingBaa-d6x
@KingBaa-d6x 18 күн бұрын
Amazing. Thanks
@husseinalsajer4381
@husseinalsajer4381 3 жыл бұрын
nice ! please , if I want to create image from sampled signal ( sine wave for example ), how can get this please the image like white line and black line
@Pateriyadivya
@Pateriyadivya 5 ай бұрын
searched a lot with the physical revelance of frequency domain and the search ended here. Thanks
@mikexcohen1
@mikexcohen1 5 ай бұрын
Awesome :)
@thomasbayes2154
@thomasbayes2154 3 жыл бұрын
Thank you, I finally understood
@mikexcohen1
@mikexcohen1 3 жыл бұрын
Awesome.
@yssjc1414
@yssjc1414 3 жыл бұрын
Very well explained!
@AriaBreath
@AriaBreath 2 жыл бұрын
Thanks so much for this fantastic explanation :)
@mikexcohen1
@mikexcohen1 2 жыл бұрын
Glad it was helpful!
@mechanicalbaba2484
@mechanicalbaba2484 3 жыл бұрын
Thats what I was finding, thanks
@xavihernandez6477
@xavihernandez6477 2 жыл бұрын
Mr., where r u all these time?
@mikexcohen1
@mikexcohen1 2 жыл бұрын
Don't worry, I'm still around :) working on new courses, books, research, etc. And trying to enjoy the weather now and then!
@hannav7125
@hannav7125 3 жыл бұрын
thanks Mike
@abbasbookwala
@abbasbookwala Жыл бұрын
AT 3:50 when you say its difficult, yet possible to figure out the frequency components from the time graph, can you help how you would figure that out?
@mikexcohen1
@mikexcohen1 Жыл бұрын
Well, you'd have to look at the time series data and count the number of peaks (or troughs) within a 1-second window. It's not very precise and can be impossible if there's too much noise.
@abbasbookwala
@abbasbookwala Жыл бұрын
@@mikexcohen1 Thank you so much for your response
@friendshipgreat5290
@friendshipgreat5290 2 жыл бұрын
Thanks bro for this awesome vedio
@mikexcohen1
@mikexcohen1 2 жыл бұрын
You got it, bro.
@yasithsam9664
@yasithsam9664 Жыл бұрын
Great Explanation :)
@mikexcohen1
@mikexcohen1 Жыл бұрын
Glad you liked it!
@jasoncui2620
@jasoncui2620 4 жыл бұрын
I'm your big fan
@mikexcohen1
@mikexcohen1 4 жыл бұрын
:D
@zeynepbetulkaya3645
@zeynepbetulkaya3645 5 ай бұрын
thank you
@roymoran1151
@roymoran1151 3 жыл бұрын
Thank you.
@mikexcohen1
@mikexcohen1 3 жыл бұрын
You're welcome!
@Rushikesh21
@Rushikesh21 3 жыл бұрын
cleared all my doubts sir:)
@mikexcohen1
@mikexcohen1 3 жыл бұрын
That's good. Doubts make you age faster, so I'm happy I can help you stay young ;)
@Rushikesh21
@Rushikesh21 3 жыл бұрын
@@mikexcohen1 😅
@ahmedalwaheshi8334
@ahmedalwaheshi8334 3 жыл бұрын
Finaly i understand it thhhaaaaaannnnkkkkkk uuuuu ssssooooooo muchhhhhhhhhh u r a hero
@mikexcohen1
@mikexcohen1 3 жыл бұрын
Yoooouuuu'rreee weeeeellllllcccooommmeee!!!
@nwars3961
@nwars3961 3 жыл бұрын
Amazing, thank you ;)
@mehmetsensoy96
@mehmetsensoy96 3 жыл бұрын
thank you for that's awesome video
@mertpurtas8913
@mertpurtas8913 2 жыл бұрын
That was purly ı was looking for .
@mikexcohen1
@mikexcohen1 2 жыл бұрын
Nice :)
@SteveGergetz
@SteveGergetz 4 жыл бұрын
That was excellent
@mikexcohen1
@mikexcohen1 4 жыл бұрын
Thanks Steve.
@tsehayenegash8394
@tsehayenegash8394 Жыл бұрын
I want the code
@adhil8918
@adhil8918 3 жыл бұрын
Thanks br0😁
@irethoronar34
@irethoronar34 3 жыл бұрын
Cristal Clear
@mikexcohen1
@mikexcohen1 3 жыл бұрын
Noice.
@rabishrestha804
@rabishrestha804 3 жыл бұрын
Thanks wow
@aditikumari3677
@aditikumari3677 4 жыл бұрын
Thank u so much it was really helpful 😇
@ahmednor5806
@ahmednor5806 2 жыл бұрын
🙏🙏🌹🌹
@8ZER08
@8ZER08 3 жыл бұрын
i love you
@mikexcohen1
@mikexcohen1 3 жыл бұрын
I love you too, 808.
@3almne
@3almne 7 ай бұрын
In the second example, the amplitude must be 5 not 1
@mikexcohen1
@mikexcohen1 7 ай бұрын
Why must that be the case?
@h-salah
@h-salah 2 жыл бұрын
THANK YOU
@abdulmalikadeola
@abdulmalikadeola Жыл бұрын
Thank you.
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