Re: Using an FM-Carrier for the Y [Luminance] Signal -- how to relieve the bandwidth issue?

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1 total messages Started by Green Xenon [Radium] Mon, 24 Sep 2007 18:14

#169

Author: Green Xenon [Radium]
Date: Mon, 24 Sep 2007 18:14

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On Sep 24, 12:23 am, "Brian Gregory [UK]" <n...@bgdsv.co.uk> wrote in 
http://groups.google.com/group/uk.tech.digital-tv/msg/e3f02036509d6ca6 :

 > "Green Xenon [Radium]" <gluceg...@excite.com> wrote in 
messagenews:46f6f08e$0$16535$4c368faf@roadrunner.com...
 >

 > > So QFM would use a combination of FM and PSK.
 > > Would this decrease the
 > > bandwidth required for broadcasting
 > > FM luminance video signals?

 > Think about it.
 > Obviously there is no way FM and PSK can
 > be going on at the same time in any
 > way that can convey separate information.

How about FM and FSK [Frequency-Shift-Keying]?

Would this work if FSK is used in place of PSK?

 > Worse still if you separately FM
 > modulate two signals that start in
 > quadrature with each other they won't
 > stay in quadrature.

Okay. Then what is the *practical* FM-equivalent of QAM?

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