Re: [Discuss-gnuradio] Question on FFT (Josh Blum)
On 08/18/2012 01:47 PM, Sam mite wrote:
> Hi Josh!
>
> Thanks for reply. I change type from complex float to float but still I
> found no negative frequency. I attached the GRC image. What should be the
> type of blocks to get both frequencies ?
>
The FFT plotter wont plot the negatives frequencies for a float stream.
Since the plot would be symmetric about 0, as Im{s(t)} == 0, it would
just be a waste of screen real estate.
-josh
>
>
> ___
> Discuss-gnuradio mailing list
> Discuss-gnuradio@gnu.org
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
___
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Question on FFT
On 17 Aug 2012 14:45, Sam mite wrote: > Hi All, > > I wanted to work on FFT using gnuradio. I have a question. Why there is only one frequency shown in plot ? why negative frequency is not being displayed ? I have attached picture of GRC implementation and FFT plot as well. > > Best Regards, > Sam Because there's no negative frequency component in your sample stream. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Question on FFT
On 08/17/2012 11:45 AM, Sam mite wrote: > Hi All, > > I wanted to work on FFT using gnuradio. I have a question. Why there is > only one frequency shown in plot ? why negative frequency is not being > displayed ? I have attached picture of GRC implementation and FFT plot as > well. > So, the blue color means complex floats. The signal source is not producing sin(t), its producing e^jwt -josh > Best Regards, > Sam > > > > ___ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
