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Dot crawl

Index Dot crawl

Dot crawl is the popular name for a visual defect of color analog video standards when signals are transmitted as composite video, as in terrestrial broadcast television. [1]

23 relations: Apple II, Checkerboard, Chroma dots, Chrominance, Color, Colour recovery, Comb filter, Component video, Composite artifact colors, Composite video, Crosstalk, Digital video, Frequency domain, Hanover bars, Intermodulation, LaserDisc, Luma (video), Multiplexing, S-Video, SECAM, Spectrum, Terrestrial television, Vacuum tube.

Apple II

The Apple II (stylized as Apple.

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Checkerboard

A checkerboard (American English) or chequerboard (British English; see spelling differences) is a board of chequered pattern on which English draughts (checkers) is played.

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Chroma dots

Chroma dots are visual artifacts caused by displaying an unfiltered analogue color video signal on a black-and-white television or monitor.

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Chrominance

Chrominance (chroma or C for short) is the signal used in video systems to convey the color information of the picture, separately from the accompanying luma signal (or Y for short).

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Color

Color (American English) or colour (Commonwealth English) is the characteristic of human visual perception described through color categories, with names such as red, orange, yellow, green, blue, or purple.

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Colour recovery

Color recovery (or color restoration) is a process which can restore lost color, specifically to television programs which were originally transmitted in color, but for which only black & white copies remain archived.

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Comb filter

In signal processing, a comb filter is a filter implemented by adding a delayed version of a signal to itself, causing constructive and destructive interference.

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Component video

Component video is a video signal that has been split into two or more component channels.

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Composite artifact colors

Composite artifact colors is a designation commonly used to address several graphic modes of some 1970s and 1980s home computers.

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Composite video

Composite video (one channel) is an analog video transmission (without audio) that carries standard definition video typically at 480i or 576i resolution.

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Crosstalk

In electronics, crosstalk is any phenomenon by which a signal transmitted on one circuit or channel of a transmission system creates an undesired effect in another circuit or channel.

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Digital video

Digital video is an electronic representation of moving visual images (video) in the form of encoded digital data.

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Frequency domain

In electronics, control systems engineering, and statistics, the frequency domain refers to the analysis of mathematical functions or signals with respect to frequency, rather than time.

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Hanover bars

Hanover bars, in one of the PAL television video formats, are an undesirable visual artifact in the reception of a television image.

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Intermodulation

Intermodulation (IM) or intermodulation distortion (IMD) is the amplitude modulation of signals containing two or more different frequencies, caused by nonlinearities in a system.

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LaserDisc

LaserDisc (abbreviated as LD) is a home video format and the first commercial optical disc storage medium, initially licensed, sold and marketed as MCA DiscoVision in the United States in 1978.

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Luma (video)

In video, luma represents the brightness in an image (the "black-and-white" or achromatic portion of the image).

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Multiplexing

In telecommunications and computer networks, multiplexing (sometimes contracted to muxing) is a method by which multiple analog or digital signals are combined into one signal over a shared medium.

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S-Video

S-Video (also known as separate video and Y/C) is a signaling standard for standard definition video, typically 480i or 576i.

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SECAM

SECAM, also written SÉCAM (Séquentiel couleur à mémoire, French for "Sequential colour with memory"), is an analogue color television system first used in France.

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Spectrum

A spectrum (plural spectra or spectrums) is a condition that is not limited to a specific set of values but can vary, without steps, across a continuum.

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Terrestrial television

Terrestrial or broadcast television is a type of television broadcasting in which the television signal is transmitted by radio waves from the terrestrial (Earth based) transmitter of a television station to a TV receiver having an antenna.

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Vacuum tube

In electronics, a vacuum tube, an electron tube, or just a tube (North America), or valve (Britain and some other regions) is a device that controls electric current between electrodes in an evacuated container.

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References

[1] https://en.wikipedia.org/wiki/Dot_crawl

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