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Article #170Re: Using an FM-Carrier for the Y [Luminance] Signal -- how to relieve the bandwidth issue?
From: Brian Gregory [UK]
Date: Mon, 24 Sep 2007 18:08
Date: Mon, 24 Sep 2007 18:08
37 lines
3446 bytes
3446 bytes
"Green Xenon [Radium]" <glucegen1@excite.com> wrote in message news:46f73fc6$0$32520$4c368faf@roadrunner.com... > On Sep 23, 3:02 pm, Brendan Gillatt > <brendanREMOVET...@brendanREMOVETHISgillatt.co.uk> wrote in > http://groups.google.com/group/uk.tech.digital-tv/msg/4c903b0a453a39fa : > > I�ve tried painfully hard to answer my questions doing my own research -- > including reading information from books. I still haven�t found answers to > my questions. That is why I am turning to NGs for assistance. > > Is Quadrature Frequency Modulation used? What for? > > AFAIK, Quadrature Amplitude Modulation uses a combo of AM and > Phase-Shift-Keying. > > So QFM would use a combination of FM and PSK. Would this decrease the > bandwidth required for broadcasting FM luminance video signals? > > I did a Google Search for �Quadrature Frequency Modulation� on > http://www.google.com/search?hl=en&lr=&q=%22Quadrature+Frequency+Modulation+%22&btnG=Search > > None of those pages made any sense to me. I had a quick look at a few of them. Some guy seems to be trying to patent something he calls Quadrature Frequency Modulation. I see this as similar to the many perpetual motion machines that get patented. If it works at all I can't see it offering anything different from QPSK (aka QAM4) in performance or bandwidth requirements. -- Brian Gregory. (In the UK) ng@bgdsv.co.uk To email me remove the letter vee.
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