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Article #227Re: Using an FM-Carrier for the Y [Luminance] Signal -- how to relieve the bandwidth issue?
From: Brian Gregory [UK]
Date: Mon, 24 Sep 2007 18:21
Date: Mon, 24 Sep 2007 18:21
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2456 bytes
I'm not an really an expert either. Actually, come to think of it, thinking of QAM as a combination of AM and PSK isn't at all helpful. I think QAM should be thought of as two carriers in quadrature with each other each being AM modulated, that is multiplied by numbers (which can be both positive and negative). The overall phase of the generated QAM signal (sum of the two carriers) does shift about as does the overall amplitude but treating them separately will not help you demodulate the QAM. I don't think I have much more to say on this subject. -- Brian Gregory. (In the UK) ng@bgdsv.co.uk To email me remove the letter vee.
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