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Re: [Discuss-gnuradio] FFT Baselines curved?
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From: |
mgray |
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Subject: |
Re: [Discuss-gnuradio] FFT Baselines curved? |
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Date: |
Mon, 18 Apr 2005 17:40:38 -0700 (MST) |
That is the shape of the 4-stage decimating CIC filter in the FPGA. For
now, sample at 2X or 4X the desired band width and then process using the
host processor. Half band filters are on the way to help correct this
problem.
On Mon, 18 Apr 2005, Lamar Owen wrote:
> Anyone have any idea why the noise floor baselines would be curved? Attached
> is a png of an example.
>
> I would have expected it to be flatter.
>