Re: [Discuss-gnuradio] About the -ve represenation on FFT graph.

[Josh Blum]

On 02/27/2011 07:57 PM, rono wrote:
> Sorry if the question was re-posted.
> 
> 
> Can anyone reply this entry level question?
> 
> 
> In complex data representation such as the attached image by grc,
> the LPF cut the frequency in both direction(+/- freq)
> which the center frequency is 0Hz
> 
> http://www.fungkai.com/~howie/sdr/complex_1_basefreq0.gif
> 
> When I set the base frequency to a large positive value such as 10MHz,
> the cutoff shows on both side apart from the center frequency too.
> 

The baseband frequency parameter only changes the value printed on the x
axis. For example: If you had a usrp source tuned to frequency X, you
would also set the baseband frequency to X -> for display purposes.

-josh