The functional stereo squlech with a slider controlling the level has
been added to usrp_wfm_rcv_pll.py. All of the activity on
wfm_rcv_pll.py in the last 24 hours has been getting gains, loop
parameters, etc. all to work correctly to reduce hiss, and allow this
squelch to work. This was also accompanied by setting the usrp default
gain so match the loop expectations.
As you slide the squelch threshold from its default value (0) to the
right, somewhere around 1/3 scale the stereo will disappear and mono
will replace it. As you move it slowly up and down you can hear the
stereo additive pop in and out. This code is functional. Not all is
perfect here and more work remains but there is so much detritus in
wfm_rcv_pll.py and it is formatted so poorly that even I have trouble
reading my mess.
The RDS signal is also picked off. For now while we await a couple of
logistical necessities to be handled, this signal is sent to a complex
null sink.
Now that all of this is together, I will go through and clean up
namespaces and all sorts of scuzz. I want to add a check box for stereo
disable, etc. but I want to clean my mess up while I look for
optimizations.
Enjoy,
Bob
–
Robert W. McGwier, Ph.D.
Center for Communications Research
805 Bunn Drive
Princeton, NJ 08540
(609)-924-4600