With lectures n courses like these no one needs to be uneducated. Lecture is in your palms and desk. Anyone can learn anything these days and become a professional with it. Thank you
Thanks for taken great efforts to show the world what it means to be pure knowledge. Most of the videos on the internet are about "This is this" but MIT has videos about "Why this is this" huge difference. Thanks, Professor Alan.
That was nothing short of an extraordinary Thx for providing and sharing such a valuable & amazing video course for educating students all around the world 🙏 It's fascinating the global effect that you guys could cause which makes the world a better place
At 14:20 , why does frequency component of the Impulse Train start shifting towards left even if sampling frequency is kept constant and only input frequency is being varied?
The sinusoidal input signal has two frequency components, one is positive and the other one is negative. When the sinusoidal input signal is sampled by the impulse train, the original two frequency components are duplicated at each frequency components of the impulse train. Therefore, the sampled signal has infinite frequency components, one pair around each frequency component of the impulse train. For example, at the origin there are two original components, one is positive (the one shown on the left in the movie) and the other one is negative (not shown in the movie). At 10khz there are two duplicated components, one on the left (the one shown on the right in the movie) and the other on the right (not shown in the movie). When the input frequency is increased, the original positive frequency component at the origin moves to the right, the original negative component is actually shifting to the left (not shown in the movie). The frequency component shown on the right in the movie around the 10khz corresponds to the original negative frequency component at the origin, so it shifts to the left exactly as the original negative frequency component does.
@@yougoog1 hey ik this is late but can u also elaborate aa bit on the water going backwards..i understand that negative frequency component in the low pass band limit is what makes it slow down even when they increase the frequency but doesnt understand why they mve backwards..does this indicate phase shift or time reversal or smthng similar.. ..also they said the water pump is 60hz set and theyre increasing the strobe frequency does that mean theyre increasing saampling frequency,shoudnt it be the other way around .Thanks in advance
This lecture was pure brilliance. Reminds you of what education really ought to be
I wish prof. Alan be in a good health, thank you MIT once more for your kind by sharing this with the world
With lectures n courses like these no one needs to be uneducated. Lecture is in your palms and desk. Anyone can learn anything these days and become a professional with it. Thank you
The high level of knowledge has been aliased down into my brain. Thank you prof Alan and all the other teachers
omggggg I love this lecture, it's nice to see how the work is applied instead of just doing maths the entire time
Thanks for taken great efforts to show the world what it means to be pure knowledge. Most of the videos on the internet are about "This is this" but MIT has videos about "Why this is this" huge difference. Thanks, Professor Alan.
What a lecture! Glad that i found such a beautiful thing on TH-cam
The best way to teach sampling and aliasing! Thank you so much!
Aliasing 16:34 to 19:44
Great lecture from great person thank you Professor Alan V Oppenhiem
Addicted to your lecture
That was nothing short of an extraordinary
Thx for providing and sharing such a valuable & amazing video course for educating students all around the world 🙏
It's fascinating the global effect that you guys could cause which makes the world a better place
Oppenheim, EE with an emphasis in trolling. 26:12
Underrated!
At 14:20 , why does frequency component of the Impulse Train start shifting towards left even if sampling frequency is kept constant and only input frequency is being varied?
The sinusoidal input signal has two frequency components, one is positive and the other one is negative. When the sinusoidal input signal is sampled by the impulse train, the original two frequency components are duplicated at each frequency components of the impulse train. Therefore, the sampled signal has infinite frequency components, one pair around each frequency component of the impulse train. For example, at the origin there are two original components, one is positive (the one shown on the left in the movie) and the other one is negative (not shown in the movie). At 10khz there are two duplicated components, one on the left (the one shown on the right in the movie) and the other on the right (not shown in the movie). When the input frequency is increased, the original positive frequency component at the origin moves to the right, the original negative component is actually shifting to the left (not shown in the movie). The frequency component shown on the right in the movie around the 10khz corresponds to the original negative frequency component at the origin, so it shifts to the left exactly as the original negative frequency component does.
@@yougoog1 hey ik this is late but can u also elaborate aa bit on the water going backwards..i understand that negative frequency component in the low pass band limit is what makes it slow down even when they increase the frequency but doesnt understand why they mve backwards..does this indicate phase shift or time reversal or smthng similar..
..also they said the water pump is 60hz set and theyre increasing the strobe frequency does that mean theyre increasing saampling frequency,shoudnt it be the other way around
.Thanks in advance
a must-watch
Thats the best demonstration on Aliasing possibly
40:21 ... Hilarious as LMAO .... look at alan's face when he turns ... his smile fades as the old guy looks away @ 40:38 ... Hahaha
i dont find it hilarious. can you please explain why you found it hilarious?
pure brilliance
Changed my way of thinking
What a great video!
This is gold!
Incredible!!! Made my day
this is so cool
speechless
orders of magnitude better than the university of queensland signals and systems course lectures
So amazing
amazing. many thanks
@mitopenCourseWare it would be nicer if you people can make timeframes for topics
I would be nice if MIT could remake this series. This video is really old.
Why? The theory didn't change and teaching doesn't get better than this.
funnily this is STILL what's in the exams, lol
I'm seeing a lot of the same things here also on Digital Signal Processing at Brazil colleges.
These videos are the best and will always be relevant.
Amazing!
I think that girl in video is a professor of EECS in MIT right now.
where ? link?
"neat"
LOL
Why don't you crack jokes like this all the time prof?
they could use some anti-aliasing on this video lmao