took me a while to understand the bomb example, for those interested I'll write down my way of explaining what's happening and pls correct me if I'm wrong: Imagine you're sitting in front of the bomb and you have a timer that started when the bomb was set off. For example, you're at 9:00 minutes now (you've been sitting there watching the bomb for 9 minutes) and for some reason, you now cut the red wire that makes the bomb explode 2 minutes earlier. You can say that the bomb will explode at 12:00 - 2:00..... or you could imagine that you're now 2 minutes forward in time. You're not at 9:00 anymore, but 11:00. 9:00 is the instantaneous time and it now became 11. You only have 1 minute to flee. Neso explained the same thing considering you were at 10:00 and that's the number you see on the bomb cause that thing on the bomb is the timer. There's a 10 in it meaning that it started from 0:00 but now it arrived at 10:00. If no one cuts the red wire it arrives at 12:00 and BOOM, otherwise, it's going to explode right NOW. In fact, NESO says at some point "the bomb will now explode".
Thanks i was having a hard time trying to understand why we do t+x to represent a left shift cuz it always seemed it was delaying it by 2 seconds and have to wait another x units to start
another shortcut trick is .. when both sign are same i,e(t+2) , (t+4) then do left shift . And if sign are opposite ie (t-2), (t-4) then go for right shifting...
Summary:- Subtracting a fixed positive quantity from the time variable will shift the signal to the right (delay) by the subtracted quantity, while adding a fixed positive amount to the time variable will shift the signal to the left (advance) by the added quantity.
Could Neso come out with a better explanation or suggest any other video which explains this time shifting in a more understandable way ? I am of course aware and appreciate the fact that these videos are available for FREE.
It's the same concept actually. In the 'oppenheim' book, they've taken 'k' as '-to' , so in that case , when 'to > 0 ' , it represents a time delay (right shift) and 'to
@Naveen Naveen Let me explain that the compressed audio signal is not an example of Time Advancing, but can be an example of Time Scaling. If we compress the signal, we can't advance the starting point of the audio signal in past as that of the '-ve' time instant. I hope you are aware of the difference between Time Scaling and Time Advancing. 👍
in the first case i understood why u made a left shift for time advancement but I did not understand why u inversed the signal . u did not inverse the signal in the second case for time delay
so far, suppose you have to do some work in a specific period of time and you start in whatever point eg. if your starting time was at 7 A.M and your specific period of time T=2 hours, so if you start in the original time (7 A.M) t= +7 you will end up at 9 A.M but either you come earlier or later of that time, this determine the time when you finish y(t) depending on the time you start in, if you come earlier suppose at 6:30 x(t+0.5) t= +6.5 then you will finish early --------------> y(t)= 8:30 A.M and so opposite if you start lately you'll delay your finishing time x(t-0.5) -------------> y(t+0.5)
Means signal will occur earlier than x=0 time, the whole thing is counter-intuitive to me, adding constant shifts the signal left, which is opposite of what you'd expect.
Your videos are best on UA-cam for signal and system but since there is shortage of time can you please tell most important topics for internship tests so that i can focus on them first as there are lot of burden from other subjects too. Please.
The signal is advanced because everything is occurring 2 seconds earlier. Simple way to understand it is if the shifting is a positive number, it moves to the left, if it is a negative number it moves to the right.
I think he was basically saying that you can't advance a signal in real time, such as somebody speaking. You cant shift a real live signal that is happening unpredictably. You don't know what comes next, so how would you advance the signal to the left such that the future is happening sooner? You can only shift a recorded signal because you already have the whole signal recorded, you know how it starts and ends, so you can create a new starting point on the signal by advancing or shifting the signal to the left.
How the hell for case 2 it's x(t-2), when we pick -2 as t coordinate and then do subtraction to get y=x(t-2) => x(-2-2) = (0:-4) thus function value x equals to zero at coordinate t = -4 that's a function y values, and here you say it's actualy 0 how the hell does this work when you subtract negative two from negative two and have 0 what the hell is that math.
@AGNI PRASANTH First we write the given signal in a simplified form as: x(2-t) = x(-t+2). Now, we can see the operations being performed on the given signal clearly as: the signal is being advanced by the factor '2', and then the signal is being reversed about y-axis due to '- ve' sign added before the time instant 't'. So, first advance the signal by an advance factor of '2' in the graph then reverse the obtained graph about y-axis, you'll get the resultant graph of the given signal.
took me a while to understand the bomb example, for those interested I'll write down my way of explaining what's happening and pls correct me if I'm wrong:
Imagine you're sitting in front of the bomb and you have a timer that started when the bomb was set off.
For example, you're at 9:00 minutes now (you've been sitting there watching the bomb for 9 minutes) and for some reason, you now cut the red wire that makes the bomb explode 2 minutes earlier.
You can say that the bomb will explode at 12:00 - 2:00..... or you could imagine that you're now 2 minutes forward in time.
You're not at 9:00 anymore, but 11:00. 9:00 is the instantaneous time and it now became 11.
You only have 1 minute to flee.
Neso explained the same thing considering you were at 10:00 and that's the number you see on the bomb cause that thing on the bomb is the timer. There's a 10 in it meaning that it started from 0:00 but now it arrived at 10:00. If no one cuts the red wire it arrives at 12:00 and BOOM, otherwise, it's going to explode right NOW. In fact, NESO says at some point "the bomb will now explode".
Thanks i was having a hard time trying to understand why we do t+x to represent a left shift cuz it always seemed it was delaying it by 2 seconds and have to wait another x units to start
thank you so much i didnt understand as well
ig the only thing that is to be corrected is that YOU ONLY HAVE 2* MINUTES TO FLEE
I'm a Canadian engineering student, and I found this really well explained. Thanks a lot!
Tm Indian hai
another shortcut trick is .. when both sign are same i,e(t+2) , (t+4) then do left shift . And if sign are opposite ie (t-2), (t-4) then go for right shifting...
Yeh 👍🏻
Thank you for explaining time shifts rather than just stating the notation as I've seen in many other videos!
Thank you sir...precise explain without wasting of time
Summary:-
Subtracting a fixed positive quantity from the time variable will shift the signal to the right (delay) by the subtracted quantity, while adding a fixed positive amount to the time variable will shift the signal to the left (advance) by the added quantity.
i like how time shifting is counter intuitive.
Sir, your videos are really helpful for me because in the 7th semester we read this course. Your approach to explaining things are extraordinary.
tmhara 7th sem hai mera 3rd sem mei kaise ye subject
@@HarshRaj-ev8pu Basically this subject is based on fourier series and transform functions.
Time shifting is a little bit counter intuitive topic but your explanation with the example really help me understand it.
Thank you..!
The example was just wow😊
It is so interesting and better if you can increase the sound of the video when editing
Could Neso come out with a better explanation or suggest any other video which explains this time shifting in a more understandable way ? I am of course aware and appreciate the fact that these videos are available for FREE.
thank you so much, interesting
subject and illustration
Thank You!
Good Explanation 💯
Extremely helpful! thank you, Sir! It would be great if you have PDF Notes of your work!
Thank you for the video.
its good to have straight A's.
9:53 that's 4(seconds) shifted
THANK YOU SO MUCH
Eem okuyorsun sanırım benim gibi, hangi üniversite ?
Why we can't advanced real time signal...
Nice lectures and good way of explaining
If voice is louder it's better
I watched it.
sir can u please explain in more detail why we do left shift when we have +ve value of k
seriously
i have an exam tomo . thank sir verymuch
in signal and system book by oppenheim on page # 38 ,39 the concept of time shifting is vice versa to your lecture can you please guide clearly
It's the same concept actually. In the 'oppenheim' book, they've taken 'k' as '-to' , so in that case , when 'to > 0 ' , it represents a time delay (right shift) and 'to
@@mostlyharmless161 but right and left shift conditions in this video are different
Sir but how are u taking her time in negative domain
There is a sudden raise at 0 and 2 u can't directly say lessthanorequalto it is less than in continuos signals
are you going to make videos on Fourier Series, Fourier Transform? Etc?
But in my textbook it's written if K is negative that results in left shifting and you said the opposite?
why is the signal in the case 2 is triangle instead like earlier ones which were square or rectangle?
can u explain advanced signal is not possible? with example, because the audio(songs) can be compress
@Naveen Naveen
Let me explain that the compressed audio signal is not an example of Time Advancing, but can be an example of Time Scaling.
If we compress the signal, we can't advance the starting point of the audio signal in past as that of the '-ve' time instant.
I hope you are aware of the difference between Time Scaling and Time Advancing. 👍
in the first case i understood why u made a left shift for time advancement but I did not understand why u inversed the signal . u did not inverse the signal in the second case for time delay
oh , found out the mistake in my miscomprehension . thanks for the video
i think the shifted amount is wrong in both cases by 1 unit
Thank you
why we cannot advance a signal in real time?
a good chanel bro
what is the solution if x(t+2) and x(t-2) is to be happened from 2nd quadrant?
Can you please upload lectures on Fourier series n transform
Thanks
What is meant by recorded singal
can you give me some practical applications for time shifting both negative and positive
so far, suppose you have to do some work in a specific period of time and you start in whatever point eg. if your starting time was at 7 A.M and your specific period of time T=2 hours, so if you start in the original time (7 A.M) t= +7 you will end up at 9 A.M but either you come earlier or later of that time, this determine the time when you finish y(t) depending on the time you start in, if you come earlier suppose at 6:30 x(t+0.5) t= +6.5 then you will finish early --------------> y(t)= 8:30 A.M and so opposite if you start lately you'll delay your finishing time x(t-0.5) -------------> y(t+0.5)
please do make some video on convolution integral of both continuous and discrete time
it is very good but we hope you will also prepare according to GATE EXAM EXAMPLE
sir if we subtract 2sec of time from original time.for suppose t-2.it is redusing the original then why we not call it as time advance.
In time shifting with k=+2 , It must be shifted to left, not to reflect it
what do you mean by advancing of singnals?
Means signal will occur earlier than x=0 time,
the whole thing is counter-intuitive to me, adding constant shifts the signal left, which is opposite of what you'd expect.
how do we fid out values of b, like first we took b=2 and then b=0.5? Is it our choice or is there some steps?
thank u so much , but in case 1 when ''k'' is positive you reflected the signal about the vertical axis did not shifted it to the left by 2 ...
Why k=2 time is left shifting and k=-2 time is right shifting
i think its x(t)=x(t+k) and with the concept of the time bomb, makes sense
Your videos are best on UA-cam for signal and system but since there is shortage of time can you please tell most important topics for internship tests so that i can focus on them first as there are lot of burden from other subjects too. Please.
what is the meaning of advancing the signal.........couldnt understand the last few seconds
The signal is advanced because everything is occurring 2 seconds earlier. Simple way to understand it is if the shifting is a positive number, it moves to the left, if it is a negative number it moves to the right.
I think he was basically saying that you can't advance a signal in real time, such as somebody speaking. You cant shift a real live signal that is happening unpredictably. You don't know what comes next, so how would you advance the signal to the left such that the future is happening sooner? You can only shift a recorded signal because you already have the whole signal recorded, you know how it starts and ends, so you can create a new starting point on the signal by advancing or shifting the signal to the left.
This topic requires a better interpretation due to obvious notation (Advancing / Delays etc ?) confusion.
X greater than 2 and 0greterthan t lessthan 2 that is explain bro
sound of the lectures is very low ...please consider the matter
lectures is very useful for me if voice is louder it's better fol all viewer
Nice
Sir one doubt if time bomb is set at timer 10 minutes then how it will explode at 12 minutes sir as you told.
content is nice so please take care of voice
How the hell for case 2 it's x(t-2), when we pick -2 as t coordinate and then do subtraction to get y=x(t-2) => x(-2-2) = (0:-4) thus function value x equals to zero at coordinate t = -4 that's a function y values, and here you say it's actualy 0 how the hell does this work when you subtract negative two from negative two and have 0 what the hell is that math.
Iam full confusion in this lecture
views kam aaye toh lagaye tumne ads thats fact
IS THIS LECTURE COVERS COMPLETE GATE SYLLABUBS?
Yes
work on your sound quality plzz...
can we prepare for ipu exams also from these lec???
@@nesoacademy when will be the EMTL classes are available
This time shifting is confusing.
sir time negative kaise ho skta hai?
Not understood
voice is too slow not audible
X(2-t)..?
first reflect on y axis and shift 2 units left.
x-(t-2) solve it . then u get the ans...........................
FBI wants your location 3:49 😂
X(2-t)..?
X(2-t)..?
@AGNI PRASANTH
First we write the given signal in a simplified form as: x(2-t) = x(-t+2).
Now, we can see the operations being performed on the given signal clearly as: the signal is being advanced by the factor '2', and then the signal is being reversed about y-axis due to '- ve' sign added before the time instant 't'.
So, first advance the signal by an advance factor of '2' in the graph then reverse the obtained graph about y-axis, you'll get the resultant graph of the given signal.
X(2-t)..?