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Re: [Discuss-gnuradio] About the -ve represenation on FFT graph.
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From: |
Josh Blum |
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Subject: |
Re: [Discuss-gnuradio] About the -ve represenation on FFT graph. |
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Date: |
Mon, 28 Feb 2011 00:36:22 -0800 |
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User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.13) Gecko/20101208 Lightning/1.0b2 Thunderbird/3.1.7 |
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