[Discuss-gnuradio] Re: ssb phasing demod revisited

[Chuck Swiger]

At 12:13 AM 2/26/2005 +0530, you wrote:

Oh, one other thing on the phasing demod script - you can get a huge
effeciency gain eleminating a lot of inter-block overhead by replacing:

        self.connect (lo_c, c2r)
        self.connect (lo_c, c2i)

        self.connect (combine, (mix_i,0))
        self.connect (combine, (mix_q,0))

        self.connect (c2r, (mix_i,1))
        self.connect (c2i, (mix_q,1))

        self.connect (mix_i, lpf1)
        self.connect (mix_q, lpf2)

with one gr.freq_xlating_fir_filter()  like I use in the weaver SSB demod. 
I guess you can
say the weaver method is just a dual-conversion phasing method ;) with the 
sharp filters
and 2nd mixer running at low cost audio sampling rates.

--Chuck