Admin: Created page with "A '''drop-out compensator''' is an error concealment device that was commonly used in the analog video era to hide brief RF signal "drop-outs" on videotape playbac..."

2019-05-15T04:25:10Z

Created page with "A '''drop-out compensator''' is an error concealment device that was commonly used in the analog video era to hide brief RF signal "drop-outs" on videotape playbac..."

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A '''drop-out compensator''' is an [[error concealment]] device that was commonly used in the [[analog video]] era to hide brief RF signal "drop-outs" on [[videotape]] playback caused by imperfections in or damage to the tape's magnetic coating. Most compensators worked by repeating earlier video scan-lines over short periods of signal loss; one early such system, "Mincom" was developed in the 1960s by the Minnesota Mining and Manufacturing Company, the company now known as [[3M]]. Because of the high cost of the 3M device at the time, [[BBC R&D]] engineers developed a simpler, less expensive unit based on a [[sample-and-hold]] technique for in-house use.

Dedicated drop-out compensators were eventually superseded by the incorporation of drop-out compensation functionality into [[timebase corrector]]s based on analog-to-digital conversion and digital line stores.

The advent of [[compressed digital video]] systems finally eliminated the need for line-based drop-out compensators. Most low-level media errors, such as those caused by tape damage or imperfections, are now dealt with by [[forward error correction]] techniques, and those which overwhelm the FEC layer are typically too severe to remedy using simple line-based error concealment techniques, because damage to the compressed bitstream will often damage large parts of the video image. However, since occasional signal drop-outs can still occur, either through severe tape damage or because of [[packet loss]] in packetized video transmission, modern [[error concealment]] techniques that are aware of the structure of the compressed video format have been developed to deal with these.

==Source==

[http://wikipedia.org/ http://wikipedia.org/]
==See Also on BitcoinWiki==
* [[IRIS]]
* [[Rouge]]
* [[SOAR]]
* [[Cubomania]]
* [[Anything App]]

Drop-out compensator - Revision history

Admin: Created page with "A '''drop-out compensator''' is an error concealment device that was commonly used in the analog video era to hide brief RF signal "drop-outs" on videotape playbac..."