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A cable channel (sometimes known as a cable network) is a television network available via cable television. Many of the same channels are distributed through satellite television . Alternative terms include non-broadcast channel or programming service , the latter being mainly used in legal contexts.
Analog television is the original television technology that uses analog signals to transmit video and audio. [1] In an analog television broadcast, the brightness, colors and sound are represented by amplitude , phase and frequency of an analog signal.
Analog television system by nation Analog color television encoding standards by nation. Every analog television system bar one began as a black-and-white system. Each country, faced with local political, technical, and economic issues, adopted a color television standard which was grafted onto an existing monochrome system such as CCIR System M, using gaps in the video spectrum (explained ...
Advanced Television Systems Committee (ATSC) standards are an international set of standards for broadcast and digital television transmission over terrestrial, cable and satellite networks. It is largely a replacement for the analog NTSC standard – like that standard – is used mostly in the United States , Mexico , Canada , South Korea ...
The elements of a simple broadcast television system are: . An image source. This is the electrical signal that represents a visual image, and may be derived from a professional video camera in the case of live television, a video tape recorder for playback of recorded images, or telecine with a flying spot scanner for the transfer of motion pictures to video).
In an analog channel model, the transmitted message is modeled as an analog signal. The model can be a linear or non-linear , time-continuous or time-discrete (sampled) , memoryless or dynamic (resulting in burst errors ), time-invariant or time-variant (also resulting in burst errors), baseband , passband (RF signal model), real-valued or ...
The defining example of a circuit-switched network is the early analogue telephone network.When a call is made from one telephone to another, switches within the telephone exchanges create a continuous wire circuit between the two telephones, for as long as the call lasts.
Network architecture is the design of a computer network.It is a framework for the specification of a network's physical components and their functional organization and configuration, its operational principles and procedures, as well as communication protocols used.