Quantum Data 801GC, 801GF, 801GX manual

Horizontal Pulse delay is the period of time from the last active pixel in a scan line to the leading edge of the horizontal sync pulse. Some display spec sheets refer to this period as the horizontal sync front porch. Horizontal Pulse width is the width of the horizontal sync pulse itself.

Vertical Pulse delay is the period of time from the last active scan line to the leading edge of the ver- tical sync pulse. Some display spec sheets refer to this period as the vertical sync front porch. Vertical Pulse width is the width of the vertical sync pulse itself. The 801G* always uses the entered values for non-interlaced American (E.I.A.) sync types. The values used are different for other sync types:

❖If you had a non-interlaced format that had the vertical sync delay set to 8 lines and vertical sync width set to 3 lines, a European (C.C.I.R.) selec- tion would produce 7.5 lines of delay and 2.5 lines of sync.

❖The 801G* blanks the half lines of active video that would appear at the top and bottom of in- terlaced formats. Vertical sync delay is measured from the last full line of active video in each field. If you had an interlaced format that had the vertical sync delay set to 8 lines and vertical sync width set to 3 lines, you would have the following results: An American sync selection would produce 8 lines of delay in one field and 8.5 lines of delay in the second field. There would be 3 lines of sync in both fields. A European sync selection would produce 7.5 lines of delay in one field and 8 lines of delay in the second field. There would be 2.5 lines of sync in both fields.

EQ Before sets the how many scan lines just prior to the vertical sync interval will contain pre-equal- ization pulses. EQ After sets the how many scan lines right after the vertical sync interval will con- tain pre-equalization pulses. The pulses are only added to composite sync outputs that have equal- ization pulses enabled.

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