A monoscope video camera tube is a special form which displays a single still video image. Picture tube, so the name was built in. The tube is similar to a small cathode ray tube (CRT). Psychosocialisms were used to create TV test patterns and station logos in the early 1950's. This type of test card generation system was technically obsolete in the 1980s.

Monoscope was similar to the creation of a CRT with an electron gun at one time, but instead of a picture-styled phosphor-cocode screen, it had a metal object in place. As the electron beam scans the target, the number of electrons varies from the different area of ​​the image. Reflected electrons are sorted by an internal electrode ring, it creates a separate electrical signal that becomes video output of the tube.

This signal still reproduces the exact image of the target, so the monomoccup is still used to create images like test patterns and station logo cards. For example, the classic Indian Head Test Card, used by NBC, is often produced using a single monoco on the right.


Target is the test card in this example
Monocosms were available with a variety of patterns and messages and can be ordered with a custom image as a station logo. Attention is used extensively for generating general announcements such as "camera" test card, station logo, special signal for testing and "please stand" and "resume normal service ...." They had a lot of benefits using a live camera directed at one card; An expensive camera was not tied up, they were always ready, and the focus was not misframed out. Indeed, monomocos are often used to synthesize the camera directly by comparing the image of the image and the same test pattern.

The goal with a letter generator part number and symbol
Referring to an electronic camera in the same fixed monochrome caption for a long time, the image can burn to the camera tube - and even in extreme cases it can also be seen on a monitor phosphor.

In the 1960s, text-mode video displays for short periods were used as character generators for video rendering. [1] [2] [3] [4] In the 1960's, due to the lack of a color test card and the problem of solid-state TV test pattern signal generator, the monoscope has reduced popularity.

A test card, also known as a test pattern or start-up / closedown test, is a television test signal, usually broadcasting occasionally when the transmitter is active but no program (often broadcasting is sign-on and sign-off). Used from early TV broadcasts, test cards were mainly physical cards where a television camera tips were made, and these cards are often used to calibrate, align, and match cameras and camcorders. These days the test signals generated by the signal generator, which are used to calibrate test patterns or solve downstream signal paths, are not dependent on the proper configuration (and presence) of a camera. Digital-made card vendors, viewers and television stations are allowed to adjust their equipment for optimum performance. During the test card, audio broadcasts are shown usually a sine wave tone, radio (if connected or connected to a television channel) or music (usually helpful, but broadcasts with some jazz or popular music).

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