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

Thanks for your kindly reply.

Can you explain more that, both sides from the center frequency of the
input frequency has been cut by a low pass filter.

Doesn't a low pass filter allow the lower frequency to pass?

Thanks,
Rono

On 28/02/11 12:22, Josh Blum wrote:
>
> 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
>
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