Definitions for test card
test card

WiktionaryRate this definition:0.0 / 0 votes

1. test cardnoun

   A card printed with various letters or symbols, used in testing vision.

2. test cardnoun

   A test signal, typically broadcast at times when the transmitter is active but no programme is being broadcast (often at startup and closedown).

WikipediaRate this definition:0.0 / 0 votes

1. Test card

   A test card, also known as a test pattern or start-up/closedown test, is a television test signal, typically broadcast at times when the transmitter is active but no program is being broadcast (often at sign-on and sign-off).Used since the earliest TV broadcasts, test cards were originally physical cards at which a television camera was pointed, allowing for simple adjustments of picture quality. Such cards are still often used for calibration, alignment, and matching of cameras and camcorders. From the 1950s, test card images were built into monoscope tubes which freed up the use of TV cameras which would otherwise have to be rotated to continuously broadcast physical test cards during downtime hours. Electronically generated test patterns, used for calibrating or troubleshooting the downstream signal path, were introduced in the late-1960s. These are generated by test signal generators, which do not depend on the correct configuration (and presence) of a camera, and can also test for additional parameters such as correct color decoding, sync, frames per second, and frequency response. These patterns are specially tailored to be used in conjunction with devices such as a vectorscope, allowing precise adjustments of image equipment. The audio broadcast while test cards are shown is typically a sine wave tone, radio (if associated or affiliated with the television channel) or music (usually instrumental, though some also broadcast with jazz or popular music). Digitally generated cards came later, associated with digital television, and add a few features specific of digital signals, like checking for error correction, chroma subsampling, aspect ratio signaling, surround sound, etc. More recently, the use of test cards has also expanded beyond television to other digital displays such as large LED walls and video projectors.

WikidataRate this definition:0.0 / 0 votes

1. Test card

   A test card, also known as a test pattern, is a television test signal, typically broadcast at times when the transmitter is active but no program is being broadcast. Used since the earliest TV broadcasts, test cards were originally physical cards at which a television camera was pointed, and such cards are still often used for calibration, alignment, and matching of cameras and camcorders. Test patterns used for calibrating or troubleshooting the downstream signal path are these days generated by test signal generators, which do not depend on the correct configuration of a camera. Digitally generated cards allow vendors, viewers and television stations to adjust their equipment for optimal functionality. The test card usually has a set of line-up patterns to enable television cameras and receivers to be adjusted to show the picture correctly. Most modern test cards include a set of calibrated color bars which will produce a characteristic pattern of "dot landings" on a vectorscope, allowing chroma and tint to be precisely adjusted between generations of videotape or network feeds. SMPTE bars—and several other test cards—include analog black, full white, and a "sub-black", or "blacker-than-black", which represents the lowest low-frequency transmission voltage permissible in NTSC broadcasts. Between the colour bars and proper adjustment of brightness and contrast controls to the limits of perception of the first sub-black bar, an analogue receiver can be adjusted to provide impressive fidelity. The most famous Test Card shown in the UK since 1967 and also shown in some other countries is Test Card F, which features a little girl and a clown doll in a circle in the centre of the picture.

Anagrams for test card »

1. detracts

How to pronounce test card?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

   Australian

   Veena

   Indian

   Priya

   Indian

   Neerja

   Indian

   Zira

   US English

   Oliver

   British

   Wendy

   British

   Fred

   US English

   Tessa

   South African

How to say test card in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of test card in Chaldean Numerology is: 8

2. Pythagorean Numerology

   The numerical value of test card in Pythagorean Numerology is: 9

References

1. ^ Wiktionary
   https://en.wiktionary.org/wiki/Test_Card
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Test_Card
3. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=test card