Basics of Video and TV

Overview
Are you prepared to take on the almighty Television and the components that make this device so legendary? To clear this level, one must have the wisdom to understand what makes a television work and the standards it has to defeat it... but traveler beware, if you hesitate for even a second its evolved stage of HD will captivate you to oblivion... Good Luck...

How Television Works
The Process of Transmission:


 * Image is captured


 * The Image is broadcast in some manner


 * The Image is displayed to the end user on some type of device

Analog Television


 * Creating a video signal


 * Light to electrical signal


 * Electron Beam traces an image


 * Voltage varies in proportion to light


 * Studio


 * High End Lenses, mounts, usually stream to a console


 * Portable

Example:
 * High end camcorders

http://www.explainthatstuff.com/television.html

Standards

 * National Television Systems Committee (NTSC), SECAM, PAL decide
 * Standard definition
 * 480i: 704 x 480 pixels interlaced
 * 480p: 704 x 480 pixels progressive (Enhanced Definition)
 * High Definition
 * 720p: 1280 x 720, progressive
 * 1080i: 1920 x 1080, interlaced
 * 1080p: 1920 x 1080, progressive (full or ultra HDTV)
 * 8-VSB (vestigial sideband modulation scheme with 8 discrete amplitude levels)
 * 6 MHz channel BW, delivers 19.39 Mbps

Scanning, Framing and Fields

 * Scanning
 * 2 Types
 * Interlaced and Progressive (both of which are used in HDTV)
 * Framing
 * 30 (frames) per second (NTSC)
 * Visual Persistence
 * Problem of flicker might occur
 * Fields
 * 1 Field = 1/2 Frame
 * Interlaced Scanning to reduce flicker
 * Save Bandwidth
 * 262 1/2 lines (NTSC)
 * 60 per second

HDTV

 * High-Definition Television
 * A Subset of Digital Television (DTV)
 * Best available picture resolution, clarity and color
 * Dolby Theatre Surround Sound
 * Wide-screen "movie-like" format
 * Aspect Ratio of 16:9 instead of 4:3
 * Increased Vertical (720 or 1080) and Horizontal Resolution (1280 or 1920)

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