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

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Nasser Abbasi

Posts: 5,596
Registered: 2/7/05
Re: question on fft example
Posted: Nov 15, 2012 3:37 AM
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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




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