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

On 02/27/2011 10:21 PM, Howard Wong wrote:
> 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.
>

If you want to filter around 0 to f, then use the complex bandpass
filter. Its the same FIR filer with different filter taps.

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

Correct. For a complex baseband signal, this is all frequencies between
+/- cutoff_freq

-josh

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