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National Television Standards Committee

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DEFINITION: The NTSC (National Television StandardsCommittee) was responsible for developing, in 1953, a set of standard protocol fortelevision (TV) broadcast transmission and reception in theUnited States. Two other standards - Phase Alternation Line (PAL) and Sequential Couleur avec Memoire (SECAM) - are used in other parts of the world. The NTSC standards have not changed significantly sincetheir inception,  … 
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NATIONAL TELEVISION STANDARDS COMMITTEE DEFINITION (continued): …  except for the addition of new parameters forcolor signals. NTSC signals are not directly compatible withcomputer systems.An NTSC TV image has 525 horizontal lines perframe (complete screen image). These lines are scanned from leftto right, and from top to bottom. Every other line is skipped.Thus it takes two screen scans to complete a frame: one scan forthe odd-numbered horizontal lines, and another scan for theeven-numbered lines. Each half-frame screen scan takesapproximately 1/60 of a second; a complete frame is scanned every1/30 second. This alternate-line scanning system is known asinterlacing.Adapters … 
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