Kerim
Hi All,
I am looking for any reference that shows (in block diagrams in the least) a DSB-SC detector but other than the complex one known as "Costas Loop".
The reason I am doing this now, because 32 years ago I designed a DSB-SC demodulator as a project for my MS thesis in communication. Then it happens that I forgot about it, thinking that the simple method/solution I found for it will be surely discovered, with time, by many others around the world.
Now at age 61, I had the curiosity to find out the first engineer who got the same idea of mine in modifying the conventional PLL in a simple way (no I-Q signals and filters) to recover, as frequency and phase, the missing carrier in a DSB-SC signal. Indeed the production cost of my simple circuit is comparable with the well-known low-cost diode detectors. Obviously its features are also similar to the synchronous demodulators hence it can track automatically any shift of the missing carrier (like the Automatic Frequency Control AFC found in FM radio set).
Result:
As far as I know and hear from others, it seems and till these days I am the only one who happened to know how to build the simplest DSB-SC demodulator! (which also works with normal DSB for any AM index). And that is why I am posting this topic here so that someone might show me I am wrong :)
For instance, I found the missing trick by chance when I did a mistake in running my circuit for the last time. On that day I did what Archimedes did (but I wasn't in a bath). I run outside the lab shouting ... "I have found it."... "I have found it." Because that day was the last one I had to work in the lab, after 5 months of failures.
Any reply is appreciated.
Kerim
I am looking for any reference that shows (in block diagrams in the least) a DSB-SC detector but other than the complex one known as "Costas Loop".
The reason I am doing this now, because 32 years ago I designed a DSB-SC demodulator as a project for my MS thesis in communication. Then it happens that I forgot about it, thinking that the simple method/solution I found for it will be surely discovered, with time, by many others around the world.
Now at age 61, I had the curiosity to find out the first engineer who got the same idea of mine in modifying the conventional PLL in a simple way (no I-Q signals and filters) to recover, as frequency and phase, the missing carrier in a DSB-SC signal. Indeed the production cost of my simple circuit is comparable with the well-known low-cost diode detectors. Obviously its features are also similar to the synchronous demodulators hence it can track automatically any shift of the missing carrier (like the Automatic Frequency Control AFC found in FM radio set).
Result:
As far as I know and hear from others, it seems and till these days I am the only one who happened to know how to build the simplest DSB-SC demodulator! (which also works with normal DSB for any AM index). And that is why I am posting this topic here so that someone might show me I am wrong :)
For instance, I found the missing trick by chance when I did a mistake in running my circuit for the last time. On that day I did what Archimedes did (but I wasn't in a bath). I run outside the lab shouting ... "I have found it."... "I have found it." Because that day was the last one I had to work in the lab, after 5 months of failures.
Any reply is appreciated.
Kerim