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Time and frequency domains 

Mike X Cohen
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This video lesson is part of a complete course on neuroscience time series analyses.
The full course includes
over 47 hours of video instruction
lots and lots of MATLAB exercises and problem sets
access to a dedicated Q&A forum.
You can find out more here:
www.udemy.com/...
For more online courses about programming, data analysis, linear algebra, and statistics, see
sincxpress.com/

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4 окт 2024

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Комментарии : 146   
@bulbulroyagarwal9647
@bulbulroyagarwal9647 3 года назад
The search ends.. Finally an Excellent explanation of the concept with total clarity. Thanks a lot!
@mikexcohen1
@mikexcohen1 3 года назад
And now my search for the best RU-vid comment has ended! We may both go in peace ;)
@MeistroJB
@MeistroJB 3 года назад
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 2 года назад
i can confirm that i was looking for so long to know the use of spectrum untill setteled here
@OmniTraders
@OmniTraders 2 года назад
What will this help exactly
@tidytelz
@tidytelz Год назад
It is actually the best explanation I have seen so far.
@electric_sand
@electric_sand 11 месяцев назад
Clear voice, clear images, clearly explained. Thank you.
@denisjoly4300
@denisjoly4300 4 года назад
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 года назад
awww, thanks!
@a.b3203
@a.b3203 Месяц назад
Mike Cohen and Mark Newman. The saving graces of any learner. Good stuff mister 👍🏻👍🏻.
@Yalsha
@Yalsha 4 года назад
You are one of the best in the RU-vid to explaining frequency. thank you for your effort
@mikexcohen1
@mikexcohen1 4 года назад
You rock, Yasser!
@mvelisompukuzela9034
@mvelisompukuzela9034 Год назад
You really made this easy, thank you. I was struggling with understanding these two domains but now the light is there.
@mikexcohen1
@mikexcohen1 Год назад
Thank you kindly, Mveliso. I'm glad you found it useful.
@gregoryacacia8087
@gregoryacacia8087 8 месяцев назад
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 8 месяцев назад
Glad it helped!
@TravisTerrell
@TravisTerrell 4 года назад
This is so clearly explained! Thank you!
@jsmithtraveller
@jsmithtraveller Год назад
Thank you. I hope that conveys how much I appreciate you tutorials.
@mikexcohen1
@mikexcohen1 Год назад
Thanks! I'm glad you've found them useful.
@hishamtariq7054
@hishamtariq7054 Год назад
Thank you very much for providing a concise and informative explanation.
@dakynshew4163
@dakynshew4163 4 года назад
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 года назад
Happy to help!
@razor1887
@razor1887 4 года назад
I have been searching for a month. I can finally get an intuitive idea. Really appreciated!
@roymccormick5328
@roymccormick5328 Год назад
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 Год назад
Glad it was helpful!
@johnrogers1251
@johnrogers1251 3 года назад
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 года назад
Awesome, thanks John :) I hope you find the rest of my videos just as useful!
@johnrogers1251
@johnrogers1251 3 года назад
@@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.
@tubarekolah1786
@tubarekolah1786 4 года назад
Finally, I can stop my search on this topic bcos I've got it
@mikexcohen1
@mikexcohen1 4 года назад
Now you make me blush :D
@DavidClendenen
@DavidClendenen Месяц назад
Finally, a clear explanation. Thank you!
@mikexcohen1
@mikexcohen1 Месяц назад
Glad it was helpful!
@bonjour5651
@bonjour5651 6 месяцев назад
Thank you so much!! I was trying to find a source to understand the difference clearly. You are awesome! I appreciate.
@mikexcohen1
@mikexcohen1 6 месяцев назад
No, *you* are awesome!
@joseph13058
@joseph13058 Год назад
The best explaination I've seen of this so far.
@mikexcohen1
@mikexcohen1 Год назад
Thanks :)
@knightx9405
@knightx9405 Год назад
i gotta tell you for doing this video that, you are the definition of "Inner peace", at this moment :)
@mikexcohen1
@mikexcohen1 Год назад
If you can't fall asleep at night, try playing this video :P
@jurikang6731
@jurikang6731 8 месяцев назад
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 8 месяцев назад
Awesome :)
@isaganicomia4958
@isaganicomia4958 Месяц назад
Thank you, this is the explanation im looking for quite sometime.
@hparvizi
@hparvizi 2 года назад
FINALLY UNDERSTOOD this basic concepts. well done. thank you
@mikexcohen1
@mikexcohen1 2 года назад
Awesome ;)
@sourabhkay
@sourabhkay 2 года назад
Give this guy a medal!
@mikexcohen1
@mikexcohen1 2 года назад
Thank you, kind internet stranger.
@ДеянЦонев-ы7в
@ДеянЦонев-ы7в Год назад
Sir you are born to be a teacher ! I have follow your courses in Udemy and they are wonderfull too!
@mikexcohen1
@mikexcohen1 Год назад
Thank you kindly, user-hg1mn3qo8x.
@MGYTRAVELLER
@MGYTRAVELLER 2 дня назад
Thank you for the clear explanation!!!
@jasonstarr2036
@jasonstarr2036 2 года назад
Finally, a very clear explanation! Thank you for posting!
@mikexcohen1
@mikexcohen1 2 года назад
:)
@bhupiistersingh4097
@bhupiistersingh4097 3 года назад
Great way to explain both the domains.
@bugraaksu1252
@bugraaksu1252 3 года назад
Wonderful explanation, brief, clear and simple. Lot of thankss..
@mikexcohen1
@mikexcohen1 3 года назад
Awesome, I'm glad you found it useful.
@yaminobia7159
@yaminobia7159 Год назад
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 Год назад
Glad it was helpful!
@Christian-rf5zv
@Christian-rf5zv 10 дней назад
thank you for such a great and informative video!
@carlosvillarreal1933
@carlosvillarreal1933 Год назад
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 Год назад
Thank you, Carlos. I'm glad you're finding these useful.
@salmanjamil1248
@salmanjamil1248 Год назад
Wow! Excellent explanation!
@mikexcohen1
@mikexcohen1 Год назад
Glad you liked it :)
@unknownworld177
@unknownworld177 3 года назад
Thank you, you are great on this subjects. keep educating us
@mikexcohen1
@mikexcohen1 3 года назад
Will do! Thanks!
@ginmarx6104
@ginmarx6104 Год назад
thank you ! easy to understand and visually striking !
@imaginer04
@imaginer04 4 года назад
A nice explanation with most clear concept.
@wasilwestside
@wasilwestside Год назад
Hi Mike, I hope you are well. Absolutely beautiful way to explain the process, very impressive. Keep up the good work
@mikexcohen1
@mikexcohen1 Год назад
Thank you kindly, Wasil.
@lohithh9253
@lohithh9253 2 года назад
Wow..... What an explanation that is. Clear. Thanks a lot.
@Mulkek
@Mulkek 3 года назад
Thanks, and it's so easy & simple!
@arshadhussain734
@arshadhussain734 3 года назад
Crystal clear explanation! Thank you
@ErikaBeatrizDelgadoZhagui
@ErikaBeatrizDelgadoZhagui 4 месяца назад
Thank for such as great explanation!!
@mikexcohen1
@mikexcohen1 4 месяца назад
Glad it was helpful!
@frinikarayanidis4
@frinikarayanidis4 4 года назад
Fantastic resources, thanks Mike!
@mikexcohen1
@mikexcohen1 4 года назад
Thanks Frini!
@salihaamoura232
@salihaamoura232 4 года назад
شكرا جزيلا لك thank you very much :)
@ComputerScienceLessons
@ComputerScienceLessons Год назад
EXCELLENT!!!
@MrMec09
@MrMec09 8 месяцев назад
Thank you, it help me here!
@ckguleria7
@ckguleria7 2 года назад
finally I know what these frequency graphs tell...
@mikexcohen1
@mikexcohen1 2 года назад
Nice ;)
@Ranjit4uy2k
@Ranjit4uy2k 4 года назад
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 года назад
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 года назад
@@mikexcohen1 This Clarified my query. Awesome explanation dude. Now I understand the FFT.
@shoebshaikh1790
@shoebshaikh1790 Год назад
This is pure gold ❤
@mikexcohen1
@mikexcohen1 Год назад
@yssjc1414
@yssjc1414 3 года назад
Very well explained!
@AriaBreath
@AriaBreath 2 года назад
Thanks so much for this fantastic explanation :)
@mikexcohen1
@mikexcohen1 2 года назад
Glad it was helpful!
@muhamadariefhidayat1914
@muhamadariefhidayat1914 Год назад
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
@Pateriyadivya
@Pateriyadivya 3 месяца назад
searched a lot with the physical revelance of frequency domain and the search ended here. Thanks
@mikexcohen1
@mikexcohen1 3 месяца назад
Awesome :)
@thomasbayes2154
@thomasbayes2154 3 года назад
Thank you, I finally understood
@mikexcohen1
@mikexcohen1 3 года назад
Awesome.
@yasithsam9664
@yasithsam9664 Год назад
Great Explanation :)
@mikexcohen1
@mikexcohen1 Год назад
Glad you liked it!
@nasrink2086
@nasrink2086 3 года назад
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')
@sukursukur3617
@sukursukur3617 4 года назад
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 года назад
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.
@mechanicalbaba2484
@mechanicalbaba2484 2 года назад
Thats what I was finding, thanks
@kmsrog
@kmsrog Месяц назад
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.
@friendshipgreat5290
@friendshipgreat5290 2 года назад
Thanks bro for this awesome vedio
@mikexcohen1
@mikexcohen1 2 года назад
You got it, bro.
@saraghorbani70
@saraghorbani70 3 года назад
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 года назад
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.
@abdulmalikadeola
@abdulmalikadeola Год назад
Thank you.
@aminechniouel1418
@aminechniouel1418 Месяц назад
why do you count the picks and not the periodes of the signals ? thank you for the videos
@mikexcohen1
@mikexcohen1 Месяц назад
You can also do that. I just counted the peaks to illustrate the concept.
@hannav7125
@hannav7125 3 года назад
thanks Mike
@ahmedalwaheshi8334
@ahmedalwaheshi8334 3 года назад
Finaly i understand it thhhaaaaaannnnkkkkkk uuuuu ssssooooooo muchhhhhhhhhh u r a hero
@mikexcohen1
@mikexcohen1 3 года назад
Yoooouuuu'rreee weeeeellllllcccooommmeee!!!
@zeynepbetulkaya3645
@zeynepbetulkaya3645 4 месяца назад
thank you
@mehmetsensoy96
@mehmetsensoy96 3 года назад
thank you for that's awesome video
@mertpurtas8913
@mertpurtas8913 2 года назад
That was purly ı was looking for .
@mikexcohen1
@mikexcohen1 2 года назад
Nice :)
@nwars3961
@nwars3961 3 года назад
Amazing, thank you ;)
@Rushikesh21
@Rushikesh21 3 года назад
cleared all my doubts sir:)
@mikexcohen1
@mikexcohen1 3 года назад
That's good. Doubts make you age faster, so I'm happy I can help you stay young ;)
@Rushikesh21
@Rushikesh21 3 года назад
@@mikexcohen1 😅
@jasoncui2620
@jasoncui2620 4 года назад
I'm your big fan
@mikexcohen1
@mikexcohen1 4 года назад
:D
@xavihernandez6477
@xavihernandez6477 2 года назад
Mr., where r u all these time?
@mikexcohen1
@mikexcohen1 2 года назад
Don't worry, I'm still around :) working on new courses, books, research, etc. And trying to enjoy the weather now and then!
@jaivalani4609
@jaivalani4609 3 года назад
Thanks Mike this clearly explained . Can it happen Noise Amplitude starts dominating sinosodial waves meaning SNR
@mikexcohen1
@mikexcohen1 3 года назад
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.
@Ranjit4uy2k
@Ranjit4uy2k 4 года назад
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!
@lolo-cz3yk
@lolo-cz3yk 3 года назад
Search ends
@husseinalsajer4381
@husseinalsajer4381 3 года назад
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
@abbasbookwala
@abbasbookwala Год назад
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 Год назад
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 Год назад
@@mikexcohen1 Thank you so much for your response
@SteveGergetz
@SteveGergetz 3 года назад
That was excellent
@mikexcohen1
@mikexcohen1 3 года назад
Thanks Steve.
@aditikumari3677
@aditikumari3677 4 года назад
Thank u so much it was really helpful 😇
@adhil8918
@adhil8918 3 года назад
Thanks br0😁
@rabishrestha804
@rabishrestha804 3 года назад
Thanks wow
@irethoronar34
@irethoronar34 2 года назад
Cristal Clear
@mikexcohen1
@mikexcohen1 2 года назад
Noice.
@tsehayenegash8394
@tsehayenegash8394 Год назад
I want the code
@8ZER08
@8ZER08 2 года назад
i love you
@mikexcohen1
@mikexcohen1 2 года назад
I love you too, 808.
@ahmednor5806
@ahmednor5806 2 года назад
🙏🙏🌹🌹
@3almne
@3almne 6 месяцев назад
In the second example, the amplitude must be 5 not 1
@mikexcohen1
@mikexcohen1 6 месяцев назад
Why must that be the case?
@h-salah
@h-salah 2 года назад
THANK YOU
@roymoran1151
@roymoran1151 3 года назад
Thank you.
@mikexcohen1
@mikexcohen1 3 года назад
You're welcome!
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