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Topic: question on fft example
Replies: 5   Last Post: Nov 17, 2012 11:02 PM

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mailcwc@gmail.com

Posts: 52
Registered: 7/14/05
Re: question on fft example
Posted: Nov 15, 2012 4:40 AM
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On 11?15?, ??4?37?, "Nasser M. Abbasi" <n...@12000.org> wrote:
> On 11/15/2012 2:33 AM, oversky wrote:
>

> > The mathwork fft example in the following link,
> >http://bit.ly/SO9TuV
> > why do we double abs(Y(1:NFFT/2+1) when plotting the amplitude?

>
> > plot(f,2*abs(Y(1:NFFT/2+1)))
>
> This was talked about before. can google it. Here is my take on it:
>
> "Why does it multiply by 2?"
>
> http://12000.org/my_notes/on_scaling_factor_for_ftt_in_matlab/index.htm
>
> --Nasser


Thank you. I found a lot of useful material in your website.



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