🚀 go-pugleaf

RetroBBS NetNews Server

Inspired by RockSolid Light RIP Retro Guy

Article View: uk.tech.digital-tv
Article #205

Re: Y [Luminance] signal on FM carrier wave.

#205
From: Green Xenon [Radium]
Date: Sat, 03 Nov 2007 00:36
40 lines
2898 bytes
Roderick Stewart wrote:

> In article <472b9a39$0$20584$4c368faf@roadrunner.com>, Green Xenon [Radium] 
> wrote:
> 
>>Anyways, again, the following is interesting but only 
>>theoretically-possible. Not gonna happen with today's technology:
>>
>>The original Y signal is converted to QAM. This QAM signal is then 
>>broadcasted on an FM radio carrier wave whose base frequency is 300 Hz. 
>>300 Hz is the lowest ULF frequency and the lowest frequency used by 
>>telephones.

> 
> 
> Not gonna happen at all. If you try to modulate a 300Hz carrier with 5MHz 
> video you'll end up with a mess.

So decrease the 5 MHz frequency to a frequency that is low enough not to 
cause any distortion on a 300 Hz carrier.

> 
> 
>>Prior to converting the Y signal to QAM, the temporal and spatial 
>>frequencies [excluding DC -- 0 hertz] are downshifted in real time [sort 
>>of like the video-equivalent of the voice-changers used on the phone 
>>which can decrease the pitch of your voice in real time without 
>>decreasing the speed of your speech]. This frequency downshifting does 
>>not involve decreasing the "speeds" of the temporal or spatial 
>>components of the Y-signal. All temporal and spatial frequencies other 
>>than zero-hertz are shifted closer to zero. This decreases the bandwidth 
>>of the Y-signal. No low-pass filtering. No changing the speed of the 
>>temporal signal. No changing the size of the spatial signal.



> 
> You still believe in magic, don't you?

What about this is magic?
Technical Details
Message-ID: <472bb331$0$25644$4c368faf@roadrunner.com>
Path: arc1-ca.pugleaf.net!g2news2.google.com!news2.google.com!border1.nntp.dca.giganews.com!border2.nntp.dca.giganews.com!nntp.giganews.com!cyclone1.gnilink.net!gnilink.net!nx01.iad01.newshosting.com!newshosting.com!post02.iad01!roadrunner.com!not-for-mail
References: <472b9a39$0$20584$4c368faf@roadrunner.com> <VA.000001a5.026b23b2@removethisbit.beeb.net>

Show Full Headers
Complete Article Headers
X-Google-Thread: f928c,ab81b61b65e80ebd
X-Google-Thread: ffcae,ab81b61b65e80ebd
X-Google-Thread: 107cee,ab81b61b65e80ebd
X-Google-Thread: f7d8a,ab81b61b65e80ebd
X-Google-Thread: fdad6,ab81b61b65e80ebd
X-Google-Attributes: gidf928c,gidffcae,gid107cee,gidf7d8a,gidfdad6,public,usenet
X-Google-Language: ENGLISH,ASCII-7-bit
Path: arc1-ca.pugleaf.net!g2news2.google.com!news2.google.com!border1.nntp.dca.giganews.com!border2.nntp.dca.giganews.com!nntp.giganews.com!cyclone1.gnilink.net!gnilink.net!nx01.iad01.newshosting.com!newshosting.com!post02.iad01!roadrunner.com!not-for-mail
Date: Fri, 02 Nov 2007 16:36:12 -0800
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,uk.tech.broadcast,sci.electronics.misc,ba.broadcast,alt.radio.broadcasting
Subject: Re: Y [Luminance] signal on FM carrier wave.
References: <472b9a39$0$20584$4c368faf@roadrunner.com> <VA.000001a5.026b23b2@removethisbit.beeb.net>
In-Reply-To: <VA.000001a5.026b23b2@removethisbit.beeb.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Lines: 40
Message-ID: <472bb331$0$25644$4c368faf@roadrunner.com>
Organization: Road Runner High Speed Online http://www.rr.com
X-Complaints-To: abuse@rr.com
X-Original-Bytes: 2602