<pramodchowda@gmail.com> wrote in message
news:1103459121.614956.308770@f14g2000cwb.googlegroups.com...
> 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
Reply by Eric Jacobsen●December 20, 20042004-12-20
On 19 Dec 2004 19:05:13 -0800, "S A kumar" <arun.sakumar@gmail.com>
wrote:
>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
Reply by S A kumar●December 19, 20042004-12-19
Is Google groups turning into some sort of online homework assistance?
Reply by Daniel Nilsson●December 19, 20042004-12-19
> 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.
Reply by Stephen Maudsley●December 19, 20042004-12-19
"Fred" <Fred@nowhere.com> wrote in message
news:Ghfxd.495$yV1.279@newssvr14.news.prodigy.com...
> 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".
Reply by Jerry Avins●December 19, 20042004-12-19
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
Homework?
Jerry
--
Engineering is the art of making what you want from things you can get.
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Reply by Fred●December 19, 20042004-12-19
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?
Reply by pram...@gmail.com●December 19, 20042004-12-19
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