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[Discuss-gnuradio] Re: ssb phasing demod revisited

From: Chuck Swiger
Subject: [Discuss-gnuradio] Re: ssb phasing demod revisited
Date: Sat, 26 Feb 2005 04:04:12 -0500

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.


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