Hi This Question Is From Prof To Prof In Radio Telecom

Hi, this question is from Prof to Prof in radio telecom.It is known that the suppressed carrier of double-sideband suppressed-carrier AM signal (DSB-SC, not DSB-RC or with a pilot) can be recovered (frequency and phase) from the two sidebands by one of the two methods: “Costas Loop based on I & Q” and “the Squaring Method based on selective filter”. Both make the DSB-SC demodulator rather complex and/or sensitive in comparison to other detectors. There is a third method which is much simpler and not sensitive. It is not known yet by any university in the world since it uses the conventional simple Phase Locked Loop; phase comparator, RC filter and VCO. Obviously a minor change is added to the PLL, otherwise and as we all know, the loop cannot be locked to the suppressed carrier at its input. So I wonder if there is a university that might be interested to include this third very simple method in its course of communications. Perhaps it is time not to keep telling the graduate students that DSB-SC is harder to demodulate than the SSB-SC though the former takes twice its bandwidth! For instance, I used to hear this statement since I was at the university in the 70’s. Just in case, I prepared the new loop circuit, on the simulator LTspice, which demodulates a DSB-SC at 455 KHz (AM IF) as an example. Thanks.