| Author |
Message |
pramodchowda@gmail.com
Guest
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 Posted:
Sun Dec 19, 2004 5:25 pm Post subject:
A problem on FFT |
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Hi,
Could anyone give solution to this problem ?
Write a program to compute the 128 point FFT for the signal, x(n) =
cos(n *pi)/2.Also plot the FFT spectra.
any pointer would be helpful
Thanks
Pramod |
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Fred
Guest
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| Posted:
Sun Dec 19, 2004 6:23 pm Post subject:
Re: A problem on FFT |
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pramodchowda@gmail.com wrote:
| Quote: | Hi,
Could anyone give solution to this problem ?
Write a program to compute the 128 point FFT for the signal, x(n) =
cos(n *pi)/2.Also plot the FFT spectra.
any pointer would be helpful
Thanks
Pramod
|
But you only have one frequency?
f=1/4 cycle/sample
so that is your spectra.
you can use matlab fft(). are you being asked to code fft function
itself from scratch? |
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Jerry Avins
Guest
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| Posted:
Sun Dec 19, 2004 6:27 pm Post subject:
Re: A problem on FFT |
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pramodchowda@gmail.com wrote:
| Quote: | Hi,
Could anyone give solution to this problem ?
Write a program to compute the 128 point FFT for the signal, x(n) =
cos(n *pi)/2.Also plot the FFT spectra.
any pointer would be helpful
Thanks
Pramod
|
Homework?
Jerry
--
Engineering is the art of making what you want from things you can get.
ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ |
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Stephen Maudsley
Guest
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| Posted:
Sun Dec 19, 2004 9:38 pm Post subject:
Re: A problem on FFT |
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"Fred" <Fred@nowhere.com> wrote in message
news:Ghfxd.495$yV1.279@newssvr14.news.prodigy.com...
| Quote: | pramodchowda@gmail.com wrote:
Hi,
Could anyone give solution to this problem ?
Write a program to compute the 128 point FFT for the signal, x(n) =
cos(n *pi)/2.Also plot the FFT spectra.
any pointer would be helpful
Thanks
Pramod
But you only have one frequency?
f=1/4 cycle/sample
so that is your spectra.
you can use matlab fft(). are you being asked to code fft function
itself from scratch?
|
Could be the trick question to encourage "thinking before coding". |
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Daniel Nilsson
Guest
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| Posted:
Mon Dec 20, 2004 1:09 am Post subject:
Re: A problem on FFT |
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| Quote: | But you only have one frequency?
f=1/4 cycle/sample
so that is your spectra.
|
The signal is windowed by a 128 sample long window, this will make the
FFT different from a single frequency value. |
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S A kumar
Guest
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| Posted:
Mon Dec 20, 2004 7:58 am Post subject:
Re: A problem on FFT |
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| Is Google groups turning into some sort of online homework assistance? |
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Eric Jacobsen
Guest
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| Posted:
Mon Dec 20, 2004 11:59 pm Post subject:
Re: A problem on FFT |
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On 19 Dec 2004 19:05:13 -0800, "S A kumar" <arun.sakumar@gmail.com>
wrote:
| Quote: | Is Google groups turning into some sort of online homework assistance?
|
Or something like that. I have noticed that the quality of some the
questions is going way down, close to the point of handholding. I get
the impression that some folks are posting questions before even
thinking about it enough to frame the question clearly.
It is a little tough sometimes to assess how much of that is due to a
language barrier, though.
Eric Jacobsen
Minister of Algorithms, Intel Corp.
My opinions may not be Intel's opinions.
http://www.ericjacobsen.org |
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Mike Yarwood
Guest
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| Posted:
Tue Dec 21, 2004 12:18 am Post subject:
Re: A problem on FFT |
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<pramodchowda@gmail.com> wrote in message
news:1103459121.614956.308770@f14g2000cwb.googlegroups.com...
| Quote: | Hi,
Could anyone give solution to this problem ?
Write a program to compute the 128 point FFT for the signal, x(n) =
cos(n *pi)/2.Also plot the FFT spectra.
any pointer would be helpful
Thanks
Pramod
Hi Pramod your input signal is a repetition of -0.5 , +0.5 to fill yor fft |
( or +0.5, -0.5 if you start with n=0).
Best of luck - Mike |
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