(c) Synthesize x[1] assuming you are given the normalized values
ReX[f] = [7 1 4] and ImX[f] =[0 -2 0], and the basis functions:


c = 1.0000 1.0000 1.0000 1.0000
1.0000 0.0000 -1.0000 0.0000
1.0000 -1.0000 1.0000 -1.0000

s = 0 0 0 0
0 1.0000 0.0000 -1.0000
0 0.0000 0.0000 0.0000

Late night cram for exam. Does anyone know how to do this? Please help!

9/25/2012 11:32:03 PM

i'd divide both sides by 3, then find the square root of the left side

9/25/2012 11:39:03 PM

why do we need to normalize the signal

answer that question and you're halfway there

9/25/2012 11:39:41 PM

I don't know. I have decided I do not care why we do any of this. I just want a grade. Now can someone give me the equation.

This is the one I found

ReX¯[k ] cos( 2Bki /N) + ImX¯[k ] sin( 2Bki /N)

I don't get what the c and s are for

9/25/2012 11:43:23 PM

http://www.wolframalpha.com/input/?i=Discrete+Fourier+transform




tutorin aint free

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[Edited on September 26, 2012 at 12:12 AM. Reason : nigga]

9/25/2012 11:44:06 PM

Thank you. Except for the last part. I know everything on this exam except problem.

So this problem is really complex and I am screwed. This exam is at 9:30

[Edited on September 25, 2012 at 11:49 PM. Reason : .]

9/25/2012 11:46:03 PM

Wait are you taking ECE 421 or some csc class?

If its ECE 421 and alexander is teaching it then i'm definitely overthinking this because its only what like 4 weeks into the semester

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9/25/2012 11:49:28 PM

you're fucked

start praying

9/25/2012 11:49:48 PM

No this is csc 467. And I think you are overthinking it. I learned everything we covered in class so far in the last 4 hours. This can't be that complex.

9/25/2012 11:50:35 PM

Does it give you a sampling frequency or an m or M or anything? If not then i think you just multiply all of this shit out after transposing and then take the second line of the matrix


actually you know what. fuck this you're going back on block. shouldn't have looked at this on my phone

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9/25/2012 11:53:40 PM

Nope that is all it gives. This type of question is on both of the previous exams he gave us to study. I am fucked.

9/25/2012 11:56:30 PM

why do we need to normalize the signal

i wasn't kidding

this really is the key

9/25/2012 11:57:54 PM

On the realz. Pro tip for taking tests:

All he gave you are matrices... So multiply some of them together and write down your logic. Easy way to make a B on every exam unless your teacher/grader is a douche.

okay I got it i THINK

x[1] is going to be [1,-2]*c*s

seriously going back to ignore now. fucking ece is my weakness


also blackjesus tell me how wrong i am about all this shit tomorrow. I literally can't wait to hear it.




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9/25/2012 11:59:29 PM

he needs to normalize the signal cause it's gonna be on the test!

9/26/2012 12:01:35 AM

To scale them correctly?

9/26/2012 12:01:39 AM

I will be back to cry about it tomorrow

I HATE THIS CLASS

9/26/2012 12:04:29 AM

Spring reverb, not digits reverb.

9/26/2012 12:21:27 AM

9/26/2012 12:18:48 PM

that was my experience all the way through ECE.

Senior year i finally realized that I didn't have to study and my grade was basically proportional only to how much i went to class, not studying or doing hw.

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9/26/2012 4:12:37 PM

9/26/2012 4:28:40 PM

Yay! i was basically right in what i ORIGINALLY wrote except that i used phaser notation, and i normalized the values with 1/M i guess... Oh well i'm satisfied. Alexander would've given me 9/10 points on that shit.

k/N=Fs?

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[Edited on September 26, 2012 at 4:32 PM. Reason : DSP IS THE JAM FUCK EVERYTHING ELSE]

[Edited on September 26, 2012 at 4:33 PM. Reason : what time is your class? If i don't get a new job in 2 weeks i'm gonna start going.]

9/26/2012 4:30:38 PM

i did not enjoy this class

9/26/2012 5:06:57 PM

Crazy amount of respect for anyone who can do this stuff with ease.

9/26/2012 5:08:22 PM

The math looks complex but if you remember all this shit is a bunch of discrete dots on graphs then you can usually get through most of a problem. Phase domain is the weird stuff but it goes ignored a lot

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9/26/2012 5:15:53 PM

except of course for "faggots" amirite

[Edited on September 26, 2012 at 5:16 PM. Reason : ^^Mulva sux

9/26/2012 5:16:34 PM

Lewisje, shouldn't you be posting pictures of unfunny lesbian cartoons in the best thing thread instead of spreading your hateful homosexual propaganda in here with the adults?

9/26/2012 5:24:22 PM

man fuck dsp

cranos raped chunks of my brain with it

9/26/2012 5:28:25 PM

h8ed ece421 so bad....

9/26/2012 5:48:10 PM

ece 421 and 420 were my favorite classes

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9/26/2012 6:11:36 PM

bump

10/30/2012 4:42:40 PM

Can a get a band pass filter for real life?

10/30/2012 4:54:19 PM

^ it's doable, with specially constructed ear muff type things.

I don't know if anyone's done it yet though.

10/30/2012 7:15:50 PM

^^Come listen to my guitar amp

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10/30/2012 7:16:37 PM

exam time AGAIN. I WILL DIE

10/30/2012 8:27:24 PM

10/31/2012 10:45:40 AM

not for master's

10/31/2012 2:25:00 PM

POST FOR TOMORROWS ASS KICKING

12/4/2012 11:27:06 AM

good luck dude.

remember all this shit is made up.

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12/4/2012 11:28:30 AM

I've calculated to achieve a D I need a 20. I got this

12/4/2012 11:48:54 AM

oh man lol that sounds exactly like my old roommate.

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12/4/2012 11:50:53 AM