Re: [Discuss-gnuradio] gr.fft_vcc usage in make_fft_sink_X

[Eric Blossom]

On Wed, Mar 16, 2005 at 08:04:53PM -0500, Chuck Swiger wrote:
> At 03:55 PM 3/16/2005 -0800, you wrote:
> >This would work fine.
> >In this particular case you can reduce this to:
> >
> >>         src = gr.sig_source_f (sample_rate,gr.GR_SIN_WAVE,440,1,0)
> >>         s2p = gr.serial_to_parallel (gr.sizeof_float, fft_size)
> >>         fft = gr.fft_vfc (fft_size,True,True)
> >>         dst = gr.file_sink (gr.sizeof_gr_complex * fft_size, "fft_test")
> >
> >> now I just have to get a grasp on what, precisely, it means ;)
> >
> >Oh, that...
> 
> It certainly opens up a whole new world - so far I've shown that an ifft 
> will
> reproduce the original signal:
> 
> http://webpages.charter.net/cswiger/fft_ifft.html
> 

Re your comment re amplitude: See 
http://www.fftw.org/faq/section3.html#whyscaled

Eric