Signal function transformations and presentations

[kevin_obl]

Hi, Just got some question with some function.. which I'm not really sure about the answer!

Question as below

My answer for Question 1

Is that the right way to present the signal?


My answer for Question 2

For f(t-2)

For f(2-t)

For f(-t)

For -f(t) [Not really sure about this] Am I do it correctly?

 

[chroot]

A sine wave in the time domain has a delta function representation in the frequency domain. The height of the delta function is related to the amplitude of the sine wave; the position along the frequency axis is related to the frequency of the sine wave. Obviously, smaller period implies higher frequency.

The answers to question 2 appear to be correct.

- Warren

 

[kevin_obl]

A sine wave in the time domain has a delta function representation in the frequency domain. The height of the delta function is related to the amplitude of the sine wave; the position along the frequency axis is related to the frequency of the sine wave. Obviously, smaller period implies higher frequency.

The answers to question 2 appear to be correct.

- Warren

Am I doing it wrongly?? Since the amplitudes are given as 0.5 for part a) and part c) and 1 for part b).. That's why I just wrote them on the frequency domain.
Is that any possible way for you to show me something in picture?? Thank a lot for your help.. Appreciated

 

[kevin_obl]

Anyone here know how to add and multiply two function together??

Question Part1

Question Part2