Re: [Discuss-gnuradio] first attempt at gnuradio - ssb phasing demod

[Charles Swiger]

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