At 06:49 AM 2/15/2005 +0100, you wrote:
In hardware a Weaver modulator avoids
the need for the phase shifting baseband
filters.
What is the reason for using a Weaver
modulator
(http://webpages.charter.net/cswiger/weaver_gen.py)
in an SDR?
Is it faster than an Hilbert
transformer?
(http://comsec.com/wiki?SingleSideBandModulator)
Hi Thomas - no reason other than it's the only thing I've
gotten to work so far ;) I tried a phasing demodulator
and ran into some problems, likely from not understanding
how to use the hilbert transform gr.hilbert_fc(). Putting
together a weaver graph actually worked, and after combining
a few parts into gr.freq_xlating_fir_filter_xxx() it really became
effecient enough to use, plus sounds good. Turning to
transmitting, I just took what's working so far and turned it
around. Other strategies will likely work much better. The
above script does work, but is very inefficient as I can't
(or don't know how to) combine the rf mixers and filters
and decimators, or interpolators in the transmitting case,
into one processing block like in the demodulator.
An instructive app note:
http://www.standardproducts.philips.com/support/appnotes/analog/pdf/an1981.pdf
I'll try your script out shortly.
--Chuck
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