VooDoo DCR 6000, Planning & Installation Manual

Page: 32 / 149

1. General DCR 6024/6128/6000
1 – 23 Planning and Installation – Rev. 1 / 7. 2001
For automatic editing the DCR 6024 must provide a definite identification for each
frame.For this purpose, a continuous analog longitudinal timecode (LTC) is re-
corded on the timecode track. In addition, the machine records and reads the Audio
Sector Timecode (ASTC) .
In crossplay modes 24p, sf and 25p, sf a switchable timecode conversion is imple-
mented. This allows to playback 24p, sf tapes in a 25p, sf mode and vice versa.
If timecode crossplay is switched on, the timecode on tape will be translated into
an absolute frame number. The frame number will be used to generate the time-
code in the currently selected standard.
All interfaces (iMCS, RS422, TC–Out/XLR) will follow the crossplay mode.
Internal Editing system (DTV mode)
The integrated two-machine (Master-Slave) editor serves for automatic edit execu-
tion. It is operated via the ”EDITOR” menu. All common edit modes (Normal, Insert
and Assemble) are available. Edit timing is realized by means of IN and OUT
marks.A preview function is provided to permit edit simulation. Sequential playback
can be selected in the ”EDITOR” menu.
BX 5121 Active Terminal Board (Input Buffer)
The serial 8 channel record data (2 bit parallel) coming from the Processor is
clocked by clock 7 in the input buffer on the active terminal board (I/O buffer)
BX 5121. Clock 7 is used for timing reference. All signals have ECL level.
BY 5113 Preequalizer
On the preequalizer BY 5113 the data will be converted into a one bit serial data
stream (LSB first).
A phase locked loop circuit (PLL) generates the necessary double frequency chan-
nel clock. The following differential amplifier controls the output level and can be
gated by the REC_GATE 0-7 command.
The next differential amplifier is the real preequalizer boosting the high frequencies
to compensate H.F. loss of the record heads.
The preequalizer parameters are controlled by two values, C1 and C2.
Then the signal is buffered by a DC controlled 50
Ω
output stage.(Separate control
voltages are provided for heads 0
o
and 180
o
heads via I
2
C-bus.)
Record current and preequalizer C are adjustable from the control panel (Adjust-
Menu), preequalizer C2 is a fixed value adjusted in the factory or by service engi-
neer.
The eight signals are fed to the scanner assembly.
BY 5110 Equalizer
The play signal from the scanner is fed to an equalizer circuit to compensate the
frequency response of the head-tape system. Thus the equalizer boosts both the
high and low frequencies and can be controlled by two parameters available on the
control panel, see menu ”Adjust” channel equalizer parameter: I/D and P/D2.
Further more the equalizer contains a signal rectifier to generate an rf-envelope
signal which is used for auto-tracking and for waveform-monitoring. The rf-enve-
lope signal can alter due to different tapes, recordings and head conditions.
Timecode System
(DTV mode)
Two-Machine
(Master-Slave)
Editing System
Record Path
Play Path