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*Introduction of why we have High Definition TV

*Digital Television Overview

-Video Signal- Video is an electronic medium for the recording, copying and

broadcasting of moving visual images.

-Audio Signal- An audio signal is a representation of sound, typically as an

electrical voltage. Audio signals have frequencies in the audio frequency range of

roughly 20 to 20,000 Hz.

-Transmission- the action or process of transmitting something or the state of

being transmitted. The mechanism by which power is transmitted from an engine to the

wheels of a motor vehicle.

-8VSB Exciter-is the modulation method used for broadcast in the ATSC digital

television standard. ATSC and 8VSB modulation is used primarily in North America; in

contrast, the DVB-T standard uses COFDM. 8VSB is an 8-level vestigial sideband

modulation. In essence, it converts a binary stream into an octal representation by

amplitude modulating a sinusoidal carrier to one of eight levels. 8VSB is capable of

transmitting three bits (23=8) per symbol.

-Reception and Coverage- the action or process of receiving something sent,

given, or inflicted. a formal social occasion held to welcome someone or to celebr the

treatment of an issue by the media. ate a particular event. the extent to which

something deals with or applies to something else. the amount of protection given by an

insurance policy.

*The NTSC Television Signal

-Components- a part or element of a larger whole, especially a part of a

machine or vehicle. Each of two or more forces, velocities, or other vectors acting in

different directions that are together equivalent to a given vector.

-Redundancies-the state of being not or no longer needed or useful.

-Resolution- - A firm decision to do or not to do something. The action of solving

a problem, disputes, or contentious matters.

-Sync and Deflection- Images flash onto your screen in sync with the music.

The flash need to be sync to your camera. The act or process of deflecting or being

deflected. The amount by which something is deflected.

*NTSC Transmitter Principles

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-Cameras-Transmitting apparatus that receives the primary image on a light-

sensitive cathode-ray tube and transforms it into electrical impulses.

-Scanning- Cause (a surface, object, or part of the body) to be traversed by a

detector or an electromagnetic beam.

-NTSC Receiver Principles- One of these carries information about the

brightness, or luminance, of the televised scene, and the other carries the color, or

chrominance, information.

NTSC Transmitter/Receiver Synchronization- The National Television System

Committee. The analog television system that was used in most of Americas and pacific

island nations and territories.

-Interlaced Scanning - refers to one of two common methods for "painting" a

video image on an electronic display screen.

-Horizontal Synchronization- A term that appeared in the early years of the

21st century and is not well-define. The television locks on the horizontal and vertical

sync info in the video signal. Horiiztal sync defines the beginning of a new line.

-Vertical Synchronization- enabled, your graphics card becomes a slave to

your monitor. The beginning of a new field.

*Principles of NTSC Color Television-

-Color CRT- Two layers of phosphor, usually red and green, are coated on to the

inside of the CRT screen, and the displayed color depends on how far the electron

beam penetrated into the phosphor layers. The beam follows a zigzag path that covers

the entire screen many times per second.

-Convergence-The act, condition, quality, or fact of converging. The process or

state of converging.