No other video source, such as a computer, DVD player or set-top box is needed for the testing process. Using the corresponding video cable needed, simply connect the video test pattern generator to the supported display unit to run the test patterns on the screen. Some video test pattern generators also allow a user to test digital and/or analog audio signals through generated frequency waves. By comparing the video input pattern to the video output on a display unit, it is possible to determine how accurately a monitor displays the video it receives and if any defects can be rectified. Specific patterns are produced by the video test pattern generators to determine a variety of performance criteria, including: video resolutions, brightness and uniformity, purity and color saturation, linearity, edge geometry, sharpness, stability, etc. Video test pattern generators provide a convenient and effective way to calibrate, test and troubleshoot video display devices such as HDTVs, projectors, LCD (liquid crystal display) screens and CRT (cathode ray tube) monitors for the ideal viewing experience.
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