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[Discuss-gnuradio] mods to gr-carriertracking

From: Robert W McGwier
Subject: [Discuss-gnuradio] mods to gr-carriertracking
Date: Fri, 10 Mar 2006 15:39:27 -0500
User-agent: Mozilla Thunderbird 1.0.6 (X11/20050715)

I modified the gr complex pll carrier tracking. I changed the lock signal from a float to a bool. I added lock detection threshold setting. I added squelch and squelch enable.

These changes were made in preparation of upgrades to the FM stereo receiver. The current receiver works and the stereo separation is really sweet on strong stations. But on stations that are not strong or on stations that have no stereo signal, or while tuning, I am sure you agree the output is horrific. 1) We will remove much of the phase noise hiss that comes from squaring the "fading, distorted, etc." stereo subcarrier by doing a phase locked loop for the stereo carrier.

2) This will have the added benefit of providing a lock threshold signal "for free". You will be able to set the sensitivity of the stereo detection.

3) With the pll recovered clean carrier, a filtered version of the RDS signal will be basebanded and sent to a gr-null-sink. This will enable others to feed the gr-rds block that was recently contributed to our efforts.

Those are the great reasons I made the mods but did I break anyone's toys? Let me know.


Robert W. McGwier, Ph.D.
Center for Communications Research
805 Bunn Drive
Princeton, NJ 08540

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