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Article #128Re: Using an FM-Carrier for the Y [Luminance] Signal -- how to relieve the bandwidth issue?
From: Green Xenon [Radium]
Date: Sun, 28 Oct 2007 01:06
Date: Sun, 28 Oct 2007 01:06
40 lines
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2888 bytes
Paul Martin wrote: > In article <ujr6i3dolk1qjon2ij5tta8aip26tff9qa@4ax.com>, > John Evans wrote: > > >>Oh dear - what about the deviation? > > >>The rule of thumb bandwidth required for FM (Carson's Rule) says the >>bandwidth is given by > > >>2x(peak deviation x highest modulating frquency). What is peak deviation measured in? Hz? > >>So a system with a maximum modulating sinusoidal frequency of 15khz >>using a deviation of 75khz needs 180khz bandwidth minimum. > > >>Note a pulse would require a far greater bandwidth. Require a far greater bandwidth compared to what? A sine wave of the same frequency and amplitude? > > Depends on the type of pulse. A wavelet might be about the same. > Are you talking about the pulses [bauds] of QAM signals? Quotes from http://www.howstuffworks.com/framed.htm?parent=modem.htm&url=http://www.physics.udel.edu/wwwusers/watson/student_projects/scen167/thosguys/index.html : "The carrier signal is characterized by the number of signal intervals, or pulses, that are transmitted per second. Each pulse is called a baud."
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X-Google-Thread: f928c,9d8320c16fbdcf84 X-Google-Thread: 1133a5,9d8320c16fbdcf84 X-Google-Thread: 115947,9d8320c16fbdcf84 X-Google-Thread: 1118be,7e05cb8426dfb96 X-Google-Thread: ffcae,7e05cb8426dfb96 X-Google-Thread: 107cee,7e05cb8426dfb96 X-Google-Thread: f508e,9d8320c16fbdcf84 X-Google-Thread: f7d8a,9d8320c16fbdcf84 X-Google-Thread: fdad6,9d8320c16fbdcf84 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!news2.google.com!news.glorb.com!newscon02.news.prodigy.net!prodigy.net!nx02.iad01.newshosting.com!newshosting.com!post01.iad01!roadrunner.com!not-for-mail Date: Sat, 27 Oct 2007 18:06:15 -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? References: <46fc71d2$0$24285$4c368faf@roadrunner.com> <u9hus4-6vi.ln1@radagast.org> <4722f832$0$25703$4c368faf@roadrunner.com> <ujr6i3dolk1qjon2ij5tta8aip26tff9qa@4ax.com> <slrnfi6tb4.n9a.pm@thinkpad.nowster.org.uk> In-Reply-To: <slrnfi6tb4.n9a.pm@thinkpad.nowster.org.uk> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Lines: 40 Message-ID: <4723dde6$0$19659$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