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DTV scanning

Interlaced and progressive scanning

Interlaced scanningInterlaced Scanning: Picture constructed from interlacing two pairs of fields, each containing half the scan lines, as in todayís analog TVís. The purpose of interlacing is to minimize flicker inherent in lower-bandwidth images.

Progressive scanningProgressive Scanning: Picture constructed from single frames containing all the scan lines, progressing from top to bottom, as in todayís PC monitors. Progressive scanning provides a simpler method of constructing images but requires a faster scanning frequency and a higher bandwidth.


This DTV tip is reproduced from "The ABCs of DTV" with the permission of Sharp Electronics. Copyright 1998 Sharp Electronics Corporation.

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