Performing Preread Editing - Sony DVW-A500/1 Service Manual

6-2 Advanced Automatic Editing

6-2-4 Performing Preread Editing

Video and digital audio signals already recorded on the
tape can be used as an edit source for insert editing.
This type of editing is called preread editing, as the
VTR uses preread heads to read signals in advance.
Signals that are read in advance can be sent to mixers
for mixing, then recorded to the original channels or
other digital audio channels.
The preread editing settings are performed with the
[F1] (PRE READ) button in the HOME menu.
For details on the settings, refer to "4-2-1 Setting the
Preread Function (PRE READ)" on page 4-14.
Video
source
Digital or analog video input
Video
switcher
Audio
Digital or
mixer
analog
audio
input
Audio
source
Preread editing
6-18
Chapter 6 Editing
Notes
• In preread editing, if an input video signal is used as
the reference signal for the output video signal,
oscillation may occur because of loop-closing. To
avoid this, select the external reference signal for
preread editing by setting the item 309. SERVO
REFERENCE SELECT in the VTR SETUP menu to
ext.
• When preread mode is selected, shifting of the VTR
to E-E mode is disabled in all operation modes to
prevent oscillation caused by loop-closing. If preread
mode is deselected while a loop between the input
and output of the same channel exists, E-E signals are
output and oscillation occurs. To prevent oscillation,
do the procedure below to select PB mode for both
the video and digital audio channels before the start
of preread editing.
1
Press the ALT button, then press the [F2] (PB/EE)
button in HOME menu to select PB.
2
Press the ALT button again, and press the [F1]
Digital or
(PRE READ) button repeatedly while holding
analog
down the SFT button to select video, audio or a/v.
video
output
3
Make the required connections for preread editing.
4
Perform preread editing after selecting the insert
editing mode.
5
After preread editing, undo all the connections
Digital or
used for the preread editing.
analog
audio
output
6
Press the [F1] (PRE READ) button while holding
down the SFT button to select off.
7
Check that no loop connections remain.