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Reply #85: What is the resolution of an analog TV set? [View All]

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Flatulo Donating Member (1000+ posts) Send PM | Profile | Ignore Mon Nov-24-08 12:56 PM
Response to Reply #81
85. What is the resolution of an analog TV set?
If your answer uses the word 'pixel' then you are completely and utterly full of shit and have no idea what you are talking about. You may be too young to even understand the NTSC standard. If you did, you would realize that there was a whole world of analog video before there was even the concept of VGA.

> Are you familiar with VGA? VGA is analog, yet has a fixed resolution of 640x480.

VGA has exactly, precisely nothing to do with the NTSC and PAL standards. You're confusing the nature of the video signal with the nature of the display device.

First of all, raw analog video is just that, analog. It knows absolutely nothing about pixels. Analog video is composed of a combined luminace and chroma signal that is defined by the NTSC standard in terms of scan rate and colorburst frequency. Analog TVs take the analog composite video sigmal off the analog tape and then amplitude modulates it and rasterize it to form 525 horizontal scan lines. There is no horizontal resolution. Repeat after me. There is no horizontal resolution. Did I mention that there is no horizontal resolution?

NTSC verticle resolution was limited to 525 lines due to bandwidth limitations in CRTs 60 years ago. PAL was able to go to 625 lines because the 50 Hz verticle refresh rate gave them the ability to juggle the available bandwidth around.

Now, if you want to talk digital video encoding and conversion, I'm all ears. Perhaps this is where your expertise lies. But there are some serious gaps in your knowledge about the older analog technology that videotape used.

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