Grass Valley PROFILE FAMILY v.2.5 - Manual (Page 54)

Chapter 2 Using the Profile Configuration Manager
54 Profile Family
5. If you want video input auto timed, click Enable Auto-Timing . Auto-timing
determines if the input is synchronized to the reference genlock signal. The
disk recorder records time-base corrected video whether or not it is also
locked to the reference. If auto-timing is enabled, and the signal was able to
be timed into the system, the
Auto Timed indicator is turned on. For more
information on auto timing, see “Auto Timing” on page 47.
6. Click Enable Dithering if the incoming signal is 10-bit resolution. This
produces the best quality result. The LSB artifacts on 10-bit video feeds are
reduced. There is no effect if the incoming signal is 8-bit.
7. Click Vertical Blanking to enable vertical blanking. When enabled, for the
525 standard, lines 1 through 9 and 264 through 272 are blanked; for the 625
standard, lines 1 through 5, 311 through 317, 624, and 625 are blanked.
8. Adjust the input gain on the syncs to compensate for any losses in the input.
You can adjust the gain manually or, with earlier cards, click AGC
(Automatic Gain Control) which enables the internal quality monitoring
circuit to automatically adjust the gain to keep the sync level constant. To
adjust the gain manually, move the slider to the desired value. The range is
from 71 to 141 percent (
±
3 dB) of the input signal. (For earlier cards, the
range is from 45 to 142 percent (
±
3 dB) of the input signal for NTSC and 82
to 142 percent for PAL.) When you click Default , the Input Gain Adjustment
resets to the default value (100 percent).
9. Click Undo to return the values in the dialog box to their original settings.
10. Click Close to accept all inputs.