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Article #169Re: Using an FM-Carrier for the Y [Luminance] Signal -- how to relieve the bandwidth issue?
From: Green Xenon [Radium]
Date: Mon, 24 Sep 2007 18:14
Date: Mon, 24 Sep 2007 18:14
27 lines
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2359 bytes
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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X-Google-Thread: f928c,7e05cb8426dfb96 X-Google-Thread: 1133a5,7e05cb8426dfb96 X-Google-Thread: 115947,7e05cb8426dfb96 X-Google-Thread: 1118be,7e05cb8426dfb96 X-Google-Thread: ffcae,7e05cb8426dfb96 X-Google-Thread: 107cee,7e05cb8426dfb96 X-Google-Thread: f508e,7e05cb8426dfb96 X-Google-Thread: f7d8a,7e05cb8426dfb96 X-Google-Thread: fdad6,7e05cb8426dfb96 X-Google-Attributes: gidf928c,gid1133a5,gid115947,gid1118be,gidffcae,gid107cee,gidf508e,gidf7d8a,gidfdad6,public,usenet X-Google-Language: ENGLISH,ASCII-7-bit Path: arc1-ca.pugleaf.net!g2news2.google.com!news1.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!nx01.iad01.newshosting.com!newshosting.com!post01.iad01!roadrunner.com!not-for-mail Date: Mon, 24 Sep 2007 11:14:02 -0700 From: "Green Xenon [Radium]" <glucegen1@excite.com> User-Agent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.8b) Gecko/20050217 MIME-Version: 1.0 Newsgroups: uk.tech.digital-tv,rec.video.production,uk.media.tv.misc,sci.electronics.components,uk.tech.broadcast,sci.electronics.misc,aus.radio.broadcast,ba.broadcast,alt.radio.broadcasting Subject: Re: Using an FM-Carrier for the Y [Luminance] Signal -- how to relieve the bandwidth issue? Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Lines: 27 Message-ID: <46f7fbee$0$17122$4c368faf@roadrunner.com> Organization: Road Runner High Speed Online http://www.rr.com NNTP-Posting-Host: 75.84.20.87 X-Complaints-To: abuse@rr.com