翻訳と辞書 Words near each other ・ Test theories of special relativity ・ Test and learn ・ Test and test-and-set ・ Test and Training Enabling Architecture ・ Test and Training Range ・ Test and validation centre, Wegberg-Wildenrath ・ Test anxiety ・ Test Anything Protocol ・ Test article ・ Test assertion ・ Test automation ・ Test automation management tools ・ Test Ban Treaty ・ Test bench ・ Test call generator ・ Test card ・ Test Card F ・ Test case ・ Test case (law) ・ Test CD ・ Test Channel 6 ・ Test Claimants in the Franked Investment Income Group Litigation v IRC ・ Test compression ・ Test construction strategies ・ Test cricket ・ Test cross ・ Test d'évaluation du français ・ Test data ・ Test data exclusivity ・ Test data generation Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Test card ： ウィキペディア英語版 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 programme is being broadcast (often at startup and closedown). 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 (and presence) of a camera. Digitally generated cards allow vendors, viewers and television stations to adjust their equipment for optimal functionality. Test cards are typically broadcast with a sine wave, radio or music. ==Technical details== Test cards typically contain a set of patterns to enable television cameras and receivers to be adjusted to show the picture correctly (See SMPTE color bars). Most modern test cards include a set of calibrated colour 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 (a flat waveform at 7.5 IRE, or the NTSC setup level), full white (100 IRE), and a "sub-black", or "blacker-than-black" (at 0 IRE), which represents the lowest low-frequency transmission voltage permissible in NTSC broadcasts (though the negative excursions of the colourburst signal may go below 0 IRE). 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 (or other equipment such as VTRs) can be adjusted to provide impressive fidelity. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Test card」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.