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Re: [Discuss-gnuradio] Software Decimation - problem estimating frequenc
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From: |
Eric Blossom |
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Subject: |
Re: [Discuss-gnuradio] Software Decimation - problem estimating frequency |
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Date: |
Tue, 31 Mar 2009 20:36:51 -0700 |
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User-agent: |
Mutt/1.5.18 (2008-05-17) |
On Wed, Apr 01, 2009 at 12:45:45PM +1300, Kieran Brownlees wrote:
> My advice would be to go read up on downsampling (especially anti-aliasing
> filters). :)
>
> The short answer is you need to low pass filter the incoming signal so when
> you perform the down sampling you do not get aliasing of the signal.
Yes. Consider using
gr.fir_filter_ccf(decim, taps)
to decimate. The low pass filter taps can be generated using
gr.firdes.low_pass.
Eric