Videonics MXPro DV, Руководство пользователя

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APPENDIX B
T
IME
B
ASE
C
ORRECTOR
The MXProDV contains a Time Base Corrector (TBC) that ensures top quality
results in your productions. The TBC operates automatically at all times. You
don’t have to do anything special to use the feature.
TBC compensates for image “shifting” and “wavering” that occurs with many
VCR’s, camcorders, and other video devices. It modifies the video signal so that
all elements in the picture — lines, fields, frames, and individual dots (or, pix-
els) — appear on the OUTPUT screen exactly where they should. This improves
video signal quality significantly.
D
UAL
TBC M
ODE
You can use the MXProDV TBC as a dedicated, two-channel device to induce
time base correction on two separate channels. Set up your equipment as fol-
lows:
1 Set up the video devices normally — that is, make one the CURRENT source and
make another the NEXT source.
2 Press
DISPLAY
so that the Preview screen shows the NEXT source. (See “Display”
beginning on page 87 for instructions.)
The CURRENT source appears on the Output monitor. So the two sources each
appear on separate monitors, and both have the benefit of time base correction.
While operating in Dual TBC Mode, MXProDV can perform cut transitions as it
normally does. Use the CUT buttons to change the CURRENT source — the one
displayed on the Output screen. Use the
NEXT
buttons to choose the NEXT
source — which appears on the Preview screen.
V
ERTICAL
I
NTERVAL
D
ATA
Time code, closed captioning, and other data in the vertical interval should be
added after mixing (downstream from MXProDV). This is necessary because
dissolves and other transitions mix the data signals, making them unreadable.
The MXProDV might remove vertical interval data from the sources, depending
on how data has been added and the accuracy of a source’s time base.