Flicker fixer
video de-interlacer
A flicker fixer or scan doubler is a piece of computer hardware that de-interlaces an output video signal. The flicker fixer accomplishes this by adjusting the timing of the natively interlaced video signal to suit the needs of a progressive display for example a CRT computer monitor. Flicker fixers in essence create a progressive frame of video from two interlaced fields of video.
Flicker fixers sample the NTSC/PAL output from the output device and store each scan line from the field currently being displayed in RAM while simultaneously outputting the line alternately with the corresponding neighboring lines from the field stored previously (weaving). Some more advanced flicker fixers integrated in add-on graphics cards use more sophisticated methods. Outputting the image at double scan rate essentially composes a progressive display with all lines from both fields at full vertical refresh rate. This promotes the horizontal frequency of the signal from 15.734 kHz to 31.47 kHz (in the NTSC case, numbers for PAL are slightly lower), which can be the used to drive a VGA monitor from an output device.
Use with the Amiga
One computer capable of producing an interlaced image is the Amiga. The Amiga's default video mode is PAL or NTSC. NTSC and PAL interlaced screens have two fields called odd and even. The fields switch every 60th of a second on NTSC, or 50th of a second on PAL, which allows for higher resolution while using a narrower signal bandwidth than full 50 or 60 FPS progressive video would require, but it can also produce an alarming jittering effect for graphics with high contrast details between fields.
“Flicker fixer” enters the record as video de-interlacer. Crown Archives preserves that source wording while asking what Flicker, fixer and video can confirm, complicate or overturn.
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Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Jun 28, 2025. The linked authority identifier is Q451927. None of the 0 selected statements returned an explicit reference.
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