Preread Editing - Sony Betacam SX DNW-A28 Operation Manual

3-4 Preread Editing

Video and audio signals, already recorded onto the
tape, can be used as an edit source for insert editing,
because this unit uses the preread heads to read the
signals in advance. This type of editing is called
"preread editing".
Video source
Audio source
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, set the "OUT REF" item on Video Setting
Page 1/2 of the Submenu to "REF" and set the item
309 in the setup menu to "AUTO1" to select the
external reference signal for preread editing.
• When preread mode is selected, this unit will not
shift into E-E mode in any operation mode, to avoid
oscillation caused by the loop connection. When
preread mode is turned off, however, the E-E signal
is output and oscillation may occur if connection
between the input and output of the same channel is
not removed after preread editing.
To prevent the oscillation, select PB mode for the
video and digital audio channels in all the modes
before the preread editing, as follows:
1
Set the PB/EE switch to "PB".
2
On Video Setting Page 1/2 of the Submenu, set
"PREREAD" to "ON".
Signals read in advance can be sent to mixers for
mixing and can be returned to the original channels or
other audio channels (1 to 4).
For preread editing, set the "PREREAD" item on
Video Setting Page 1/2 of the Submenu to "ON".
SDI or analog video output
SDI or analog video input
Video switcher
SDI or analog audio input
Audio mixer
SDI or analog audio output
• When using an external switcher, set setup menu item
727 (page 6-20) to EXT.
• Some switchers cannot be used due to their delay
time. For details, consult Sony service personnel.
3
Make the necessary connections for the preread
editing.
4
Execute the preread editing after selecting the
desired insert editing.
For details of executing insert editing, see 3-1-2
"Insert Editing".
5
After preread editing, break the connections used
for the preread editing.
6
On Video Setting Page 1/2 of the Submenu, set
"PREREAD" to "OFF".
7
Make sure that no loop connection remains.
3-5
Chapter 3 Editing