Coordinated Video Timings

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Coordinated Video Timings (VESA-2013-3 v1.2[1]) is a standard by VESA which defines the timings of the component video signal. Initially intended for use by computer monitors and video cards, the standard made its way into consumer televisions.

The parameters defined by standard include horizontal blanking and vertical blanking intervals, horizontal frequency and vertical frequency (collectively, pixel clock rate or video signal bandwidth), and horizontal/vertical sync polarity.

History[edit]

The standard was adopted in 2002 and superseded the Generalized Timing Formula.

Reduced blanking[edit]

CVT timings include the necessary pauses in picture data (known as "blanking intervals") to allow CRT displays to reposition their electron beam at the end of each horizontal scan line, as well as the vertical repositioning necessary at the end of each frame. CVT also specifies a mode ("CVT-R") which significantly reduces these blanking intervals (to a period insufficient for CRT displays to work correctly) in the interests of saving video signal bandwidth when modern displays such as LCD monitors are being used, since such displays typically do not require these pauses in the picture data. This mode is only defined for vertical frequency of 60 Hz in revision 1.1.

In revision 1.2, released in 2013, a new RB2 mode has been added which further reduces blanking interval and allows for unlimited vertical refresh rates, 4K/5K/8K resolutions, 0.001 MHz pixel clock precision, and 1000/1001 modifier for ATSC/NTSC video timing modes.

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