On Fri, 2006-03-10 at 11:40 -0500, Bob McGwier N4HY wrote:
> I missed this question for 3 days.
it took 3 days to hit the list
> Yes we do. And here is how it works
>
> It makes a real, low pass filter with cutoff
>
> (H-L)/2
>
> and then spins the coefficients to the correct frequency using a complex
> sinusoid.
>
> It is used in a few places in usrp_wfm_rcv_pll.py
>
Oh - found it - cool. There it is in blksimpl/wfm_rcv_pll.py:
stereo_carrier_filter_coeffs = gr.firdes.complex_band_pass(20.0,
can make this beautiful response:
http://webpages.charter.net/cswiger/filter_response.jpg
Voila, single-sideband.
BTW I recently fixed a broken decimation rate (11 -> 16) in Mike's
examples apps/hf_radio - now is sounds much better.
tks
--Chuck
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