Lecture 2, Signals and Systems: Part 1 | MIT RES.6.007 Signals and Systems, Spring 2011
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- เผยแพร่เมื่อ 6 ก.ย. 2011
- Lecture 2, Signals and Systems: Part I
Instructor: Alan V. Oppenheim
View the complete course: ocw.mit.edu/RES-6.007S11
This lecture covers mathematical representation of signals and systems, including transformation of variables and basic properties of common signals.
ocw.mit.edu; Creative Commons Attribution-NonCommercial-ShareAlike 3.0; ocw.mit.edu/OcwWeb/web/terms/t... Album photo courtesy of Professor Alan Oppenheim
this material is over 40 years old, yet it is still the best on you tube so far...
The S&S book by Oppenheim is the best ever. I'm reading the second edition after my EE Bachelors education and I am blow away at how good this book is at explaining S&S. I wish my school used it, Instead we got some half assed book written for people who are already knowledgeable of the topic.
@@companymen42 which book did your school use?
@@pspmaster2071 Linear Systems and Signals, 2nd Edition 2nd Edition by B.P. Lathi
@@companymen42 interesting. I hear people saying Lathi's book is the clearest for a beginner and Oppenheim's is hard to read.
@@pspmaster2071 B.P. Lathi is not recommended for beginners, Oppenheim is better
This is what a teacher at the top of his game looks like
i purchased Professor Opennheims book so I could follow along. this stuff truly is timeless. his presentation is very clear. this course is very core to electrical engineering. thanks for making this public, MIT
totallly agree with this guy!!!
this course is core to pretty much all of science
after 37 years, it's still far better than my professor's lecture
Wait, is this the man, the myth, the legend...sir Oppenheim himself!?
Blessed be the mathematical knowledge from which we all must draw upon to perceive and understand such elated topics!
Cursed be our shortcomings, that prevent us from reaching ever increasing knowledge.
this guy is a legend
in 2024 im whtch this course thank you Professor Opennheims
In india 🇮🇳 I can surely say, every signals nd system course use their basic textbook as oppenheim.. And Even for competitive exam
+Selcuk Caglar He is still alive.
MIT OpenCourseWare In case of discrete time exponential signal why are we taking an expression that leads to alpha=e^beta. This only causes problem when beta is -ve, as explained by the professor. Viewing the professor's concept in opposite way why don't we simply take the signal as Ce^(beta×n) as we did in case of continuous time exponential signal.
great he's such an amazing teacher ^^
i will never be able to thank Mr. Oppenheim enough.
wish i had used internet in a proper way during my college days ,how could i miss the author teaching his own book in lucid ways..better late than never ,im gonna learn this course now.
Thanks MIT for this material, I'm from Argentina and I study for Electronical Engineer in National Tecnological University (UTN), we use the book of Alan Oppenheim in class, this videos are very useful for me, maybe for a lot of local students too, to complement the class material wich our professors have forgotten to comment there.
I have to mention that I am a follower of your university, is an inspiration for the engineering world
Thanks a lot again! continue improving!
Regards
Javier Peruzzo
aguante la unc
in 2019 and I'm watching this video ^^ and it's so instructive thank you MIT OCW 😊
this man right here is to be protected at all costs
Thank you, MIT !!! These lectures really helps me understand these topics more clearly and systematically. I really wish to study in your prestigious university sometime in the future. Ciao ~ Rex :)
Sen ne Ulu bir Bilge, sen ne güçlü kudretli bir zat, sen ne Allah dostu bi adamsın. Ver elini öpeyim hocam.
Thanks from Turkey.
yine gelmişiz buralara mk
selam hocam
@@bilginburakoztoprak3204 okuldaki hoca bu bilge hocamızın kaynaklarını kullanıyor ve birebir aynı slayt aynı konular her şey aynı. ama abi bu adam bu işi zihnine kazıyor . okuldaki anlatınca sanki kendimi afrika kabile liderinin işaret diliyle bana anlatmaya çalıştığı şeyleri anlamaya çalışıyormuşum gibi oluyorum
really great teacher and great guidance, cant tell that these videos were recorded in the old days
i m very thankful to mit for providing such a nice lectures.
Thanks MIT. Thanks MIT's Teachers and management.....
Thank you Alan V. Oppenheim, thank you mit OCW
i m very thankful to mit for providing such a nice lectures
Proud to have Richard from Silicon Valley as my professor. Pied piper compression algorithm
I can still learn something new from it.
I love this course, it's very useful. Thanks a lot.
He did a great job, my teacher though is good and the MIT Instructor was good too, by the way we would like to say THANK YOU for this great job made by MIT OCW , Its amazing donation keep it up and thank u again !
Neptl, IIT
So excellent! Thanks MIT OCW!
I literally applauded him at the end of the lecture. Great job. This is my first time understanding s&s :D
Very interesting. Great introduction for me, as a beginner.
Muchisimas gracias por compartir este material que es invaluable, el conocimiento. gracias! desde Argentina
Professor Opennheim is a legend !!!
Great videos! Thank you, we can apply signal processing to remove the background noise though
This video is very helpful. Every student must watch............
The Living Legend....
ground breaking, I can't comprehend how we have allowed current instruction to be so lacking comparatively, ty
Actually, at 7:25, he has it backwards. ODD functions are symmetric about the origin, even functions are symmetric about the Y-axis.
I think he meant to say "time origin" witch is when t = 0
and eventually it is y axis
very interesting lectures ....these lectures are like web series
I am watching these lecture in 2022 but I can't get out of the video to get good quality video lectures coz this is fantastic teaching
These videos are still useful for electronic engineers. Because it teaches fundamental of signals not classical memorization.
Here you can find the 1st lecture:
/watch?v=KJnAy6hzetw
Lecture 1 is available at iTunes U. I dont know about the others.
This is a great lecture 😁
he wrote book on signals and systems , hope i was in MIT, thanks for the lectures.
The intro music is outrageous.
Thank you.
He looks like Ross except with a mustache 😂
pure gold
At 10:28. If f (-x) = -f (x), then the function is odd.
time (32:40) :how alpha(=exp(beta)) will be negative because for all values of beta from -inf to +inf the value of alpha will be always positive.
in real exponential signal C and alpha should be real and this restriction are not on beta ,so beta may be complex or real such that alpha always come out to be real. for example exp(i*pi)=-1=alpha....
@@prabhatsingh3609 thanks for the explanation
I am about to start signals and systems course in school that uses his textbook. Any tips or suggestions before I start? These lectures will be awesome. Straight from the source
What a guy!
Oppenheim is unique.
Hi to all , can some one answer my questions
What does the spike in the autocorrelation represent? Does the spike hold all the information about the signal?How can we use the autocorrelation to help us detect the signal?
we can use correlation to detect some signal patterns
perfect
I really wished I had seen this video earlier. I have an exam on signals in 2 days time and I must say this video is so helpful!!
I'm reading his book :)
7:26 A signal said to be even if it is symmetric about the y axis. Not origin.
Well what he said is another way of what you are saying. When it's said that a function is symmetric about the origin it always means that it's not being referred as to being symmetric about the axis which accounts for the independent variable (which is 't' on x-axis in this figure). Notice his hand gesture.
These vedio may be in my watch later for a long time......= =
there are 2 parts of signals and systems, part I is lec 2, part II is lec 3
what is the year of this video? it looks like it is from 90-th? But still this video os very helpfull thanks
I can't believe that this course was recorded in 1987.
hey where is lecture 2 part II ? coz the next one i see is lecture 3 part II.. moreover where is lecture 3 part 1?
...and Oppenheim comes out of history and teaches the "real" signals and systems.
@MIT Many many thanks. you guys are astonishinggggggggggggggggggggggggggg
are you live?
Sir if we take π=(22)/7 and the N= 12πm if we take m =7 then N will be an integer. Why can't we do this ?At 23.59
The value of pi is approximated it will still be not an integer.
Pi is an irrational number, i.e., It can't be expressed as a ratio of integers. 22/7 is only an approximate.
why isnt lecture 1 in the playlist?
It's in our playlist. Maybe you are using another playlist? th-cam.com/play/PL41692B571DD0AF9B.html
I think the assignment Lecture 2 .1(b) is false;for one is cos(wt+theta),the other is sin(wt+theta);but the answer conside them all be cos(wt+theta)
did you find an answer to this?
IIT KGP, CSE sophomore, midsems 3rd sem, for my future reference
GOAT
i couldn't find
if alpha is e^b where b is a complex number. how can alpha ever be negative??? please explain for me! I thought an exponential of any type has to be always positive
+Captain Rhodes Assume b to be -j(pi/2),then you would get alpha as -j..alpha can get negative sometimes..
Joy Emmanuel thanks. do you also know why in lecture 1 he refers to alpha being negative, yet at the same time refers to it as a ''real'' exponential. if beta is complex how can alpha be considered a real exponential?
Can the course manual still be found today?
yes
Where can this be purchased or acquired?
ocw.mit.edu/resources/res-6-007-signals-and-systems-spring-2011/video-lectures/lecture-2-signals-and-systems-part-i/
Can I get that book ?
The assigned readings refer to the course textbook: Oppenheim, Alan V., and A. S. Willsky. Signals and Systems. Prentice Hall, 1982. ISBN: 9780138097318. For more info, see ocw.mit.edu/RES-6.007S11. Best wishes on your studies!
有没有中文字幕呀
how could be alpha negative?
It could if it was expressed in decibels or some other logarithmic scale.
I cannot believe UCL library doesn't have a copy of the textbook Signals and Systems......
First off Thank you for the Video, it explained everything very well. But why does it look like it's from the 70's if it's from Spring 2011?
This was recorded in 1975.
The video was recorded in 1975 but published on MIT OpenCourseWare in the spring of 2011. In some ways though, these materials are considered timeless. Even though the material is old, it is still current and considered good reference material.
+MIT OpenCourseWare 1975? Wow. I certainly don't have an issue with the vintage audio-visual equipment. And I remember how in 1975 video equipment was heavy and much harder to use than today's iPods.
MIT OpenCourseWare please can u give the pdf of openheim signals and system...
link...please
I am lost at the Complex number part :(
taşşaklarına beton yetmez sinyal reis
even? symmetric with origin? are you sure about 7.25??
Adil Can Balçık yes!
Adil Can Balçık Are you sure about your education?
Adil Can Balçık well, you are right about that my professor also had the same conversation and i corrected him.
its symmetric about the y-axis
UJJWAL ANAND its symmetric about the y-axis. You sure about your education ?
Professor just missed it...
Yeah, otherwise it becomes odd...
I don't know how the substitle making engine works but it made many mistakes in this series of lectures.
Ferraz me trouxe aqui
17:40
👏👏👏
Why after all these years the people teaching this material don't mention such important issues , for example period 31 is astonishing. 23:25
What do you mean? Other people teaching this do not mention this kind of thing?
I'm struggling to understand why discrete is different from continuous... is discrete confined to only integers? But then there's a
He is talking about discrete-TIME (a discrete x-axis), not the y-axis. The amplitude of the sine-wave can still hold continuous values, because that's the vertical axis, but the horizontal (time) axis can only hold integer values.
Is this useful in real life ?
Some quick Googling... "Yes, discretized complex exponential functions are used in many real-world applications, such as in digital filters, digital communication systems, and image processing algorithms. They are also used in modeling and simulating the behavior of physical systems in engineering and physics."
Reference: www.physicsforums.com/threads/discretized-complex-exponential.494749/
OMG fucking gawd this shit makes sense
His book is a DSP bible
please make latest version video it is very old
حد من كليه التقنيه؟
adam asetattat ders anlatıyor ama adam gibi anlatıyor.
this is why hate prudue
Es se jada mujhe aata hai
35:39
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Lecture 1 plzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
picture qulatiy is not good
dude ..... that video was made in 19's and you are expecting for hd
its from the 80s, and its a free education in signals and systems from one of the worlds most renowned professors on the topic. stop complaining and open your spoiled eyes.
also neither is your spelling.
i m very thankful to mit for providing such a nice lectures.
17:16
i m very thankful to mit for providing such a nice lectures.