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

[Robert McGwier]

Almost.  Translate the carrier to where you want it to be and then use a 
complex bandpass filter to pick off the sideband.

make the filter edges    L  < H for your favorite bandwidth  (H-L)

for USB,  make a complex filter   with edges  L, H

for LSB, make a complex band pass filter with edges

-H, -L

Take the real part, make imaginary part = real part.

send complex signal to sound card.

If you do not make imaginary part = real part  you will get  "binaural"

Bob



Eric Blossom wrote:
> On Sat, Mar 04, 2006 at 06:49:25PM +0100, Matteo Campanella wrote:
>   
> > Hello, I have made my first attempt at gnuradio and usrp today, trying
> > to get a phasing ssb demod - what follows is what I got, any suggestion
> > would be more than welcome. The demod is designed as a class to be
> > istantiated by a gui (i am using a modified version of usrp_wfm_rcv
> > gui). Right now the only sideband supported is LSB. Tested with the
> > basic rx and my 40m vertical attached, it behaves nicely.
> >
> > ciao
> > Matteo
> >     
>
> Since the usrp gives you complex baseband, there's really no reason
> for a phasing demod, just translate the signal to where you want it.
>
> Eric
>
>
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>   


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