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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. The standard was adopted in 2002 and superseded the Generalized Timing Formula.
A multiple-sync (multisync) monitor, also known as a multiscan or multimode monitor, is a raster-scan analog video monitor that can properly synchronise with multiple horizontal and vertical scan rates.
A vertical synchronization is an option in most systems in which the video card is prevented from doing anything visible to the display memory until after the monitor finishes its current refresh cycle.
This part of the line display process is the Horizontal Blank. [1] [2] In detail, the Horizontal blanking interval consists of: front porch – blank while still moving right, past the end of the scanline, sync pulse – blank while rapidly moving left; in terms of amplitude, "blacker than black".
Horizontal sync pulse width pixels 8 lsbits (0–255) 10: Bits 7–4: Vertical front porch (sync offset) lines 4 lsbits (0–15) Bits 3–0: Vertical sync pulse width lines 4 lsbits (0–15) 11: Bits 7–6: Horizontal front porch (sync offset) pixels 2 msbits (0–3) Bits 5–4: Horizontal sync pulse width pixels 2 msbits (0–3) Bits 3–2
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Horizontal sync polarity: 0 = negative 1 = positive 10–11: Horizontal sync width 12–13: Vertical active image lines 14–15: Vertical blank lines 16–17 Vertical sync offset (front porch) Bits 7:0: 8-bit LSB Bits 14:8: 7-bit MSB Bit 15: Vertical sync polarity: 0 = negative 1 = positive 18–19: Vertical Sync Width
In electrical engineering terms, for digital logic and data transfer, a synchronous circuit requires a clock signal.A clock signal simply signals the start or end of some time period, often measured in microseconds or nanoseconds, that has an arbitrary relationship to any other system of measurement of the passage of minutes, hours, and days.