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Test card. SMPTE color bars: common NTSC test pattern. PM5544: common PAL test pattern. EBU colour bars (4:3) 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 ). [ 1]
The Philips circle pattern (also referred to as the Philips pattern or PTV Circle pattern) refers to a family of related electronically generated complex television station colour test cards. The content and layout of the original colour circle pattern was designed by Danish engineer Finn Hendil [ da] (1939–2011) [ 1] in the Philips TV & Test ...
Indian-head test pattern. The Indian-head test pattern is a test card that gained widespread adoption during the black-and-white television broadcasting era as an aid in the calibration of television equipment. It features a drawing of a Native American wearing a headdress surrounded by numerous graphic elements designed to test different ...
The Philips PM5540 was an early electronic video signal generator, which generated a monochrome test card [3] that is considered to be a black-and-white predecessor of the widely used Philips PM5544 and the latter's related family of Philips circle test patterns. The content and layout of the pattern, as well as the generator, was designed and ...
Test Card D was a television test card first broadcast on 5 May 1964 by both the BBC and the ITA. This was the first test card to be based on a specification. [ 9] Test Card D was amended, and the amendment introduced on the 1st December 1965 as the radio and television trade objected to the original. Both versions had Reduced Power cards from ...
The test card was generated electronically by several video-signal generators, [5] [6] including two variations of the Philips PM5644 generator (PM5644G/50 {PAL B/G} and PM5644G/70 {} [7]) and the Rohde & Schwarz SGPF-B3 [8] (the Grundig VG 1001 test signal generator has a different pattern design, but is sometimes indicated as "FuBk" because it features similar test elements [9]).
However, generally they are considerably slower (typically by a factor 2–10) than fast, non-cryptographic random number generators. These include: Stream ciphers. Popular choices are Salsa20 or ChaCha (often with the number of rounds reduced to 8 for speed), ISAAC, HC-128 and RC4. Block ciphers in counter mode.
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