Assignment for DFT

Question

1.00/5 (1 vote)

See more:

It is desired to determine the DFT of the analogue signal
x(t) = 25 cos(10PIt)cos(400PIt).
(a)
Find the Nyquist rate of the signal.

410Hz

(b)
What is the record (signal) length if the desired frequency resolution is 5Hz?

0.2s

(c)
If the Nyquist rate from part (a) and the record length found in part (b) are used, find the number of points that will be contained in the DFT.

82

(d)
Use the MATLAB function fft to find and plot the DFT X(k). Add the frequency scale (in hertz) to the diagram.

I not sure how to write the script for the last part

Posted 22-Oct-10 5:31am

Robbie Chen

Add a Solution

Comments

Tarun.K.S 22-Oct-10 11:35am

hey Robbie this is not a electronic signals forum!! i studied those in my college dayz though!

Robbie Chen 22-Oct-10 11:46am

I just want to know how to write the matlab program for it.
I know how to plot the function but not sure how to plot the DFT

Sandeep Mewara 22-Oct-10 12:09pm

Any effort made?

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

#realJSOP · Answer 1 · 2010-10-22T05:41:00

Solution 1

Weren't you paying attention in class when the instructor told you how to do it?

Posted 22-Oct-10 5:41am

#realJSOP

Comments

Sandeep Mewara 22-Oct-10 12:08pm

Comment from OP:
No the instructor did not teach me on the matlab stuff.
It is basically self exploratory.