6-1
DNW-A220
DNW-A220P
Section 6
Overall Block Diagram and Circuit Description
This unit consists of two separable VTRs. The VTR on the left functions as a player during editing and
the VTR on the right functions as a recorder when viewed from the front.
The main difference in functions of the right and left VTRs is as described below.
(1) Control panel
Player:
The JOG/SHUTTLE dial is located at the left. (KY-406 board)
Recorder: The JOG/SHUTTLE dial is located at the right and functions required as an editing
machine are added. (KY-400 board)
(2) Analog Betacam tape PB function
Player:
An analog Betacam tape PB function is available. (DM-114/114P board)
Recorder: No analog Betacam tape PB function is available. (No DM-114/114P board)
Since the circuit configuration except described above is the same, only the player VTR is described
below.
(1) Video Signal Processing Block (CP-317, DEC-97, SDI-23, VPR-34, DP-265/
265A, and TG-191 Boards)
Recording system
The analog composite video signal input from the external equipment to the VIDEO IN connector (on the
CP-317 board) is converted from analog to digital on the DEC-97 board. After that, the signal is convert-
ed into a digital component signal using a composite decoder and sent to the input time base corrector
(TBC) on the SDI-23 board.
The SDI signal input from the external equipment to the SDI IN connector is converted from serial to
parallel on the SDI-23 board and separated into a video signal and audio signal using a D1 decoder. One
of the SDI video signal and the analog composite video signal described above is selected using an input
TBC. The setup component of the video signal output from the input TBC is eliminated (for an NTSC
system only), and VITC signal of the video signal is read and then added to the video signal. The signal is
then sent to the DPR-87 board as REC data. It is also sent to the VPR-34 board as EE data.
Playback system
The SX PB video signal sent from the DPR-87 board is processed by the JOG processing block on the
VPR-34 board and sent to the video processor IC. In the video processor IC, one of the SX PB video
signal, the analog Betacam PB video signal sent from the DM-114/114P board, and the EE video signal
sent from the SDI-23 board is selected, and selected signal is video processed (gain adjustment, setup
adjustment, and blanking addition). The digital component video signal output from the video processor
IC branches to two paths using a composite encoder IC. One is encoded to a digital composite video
signal, and the other is directly sent to the SDI-23 and DP-265/265A boards.
The digital composite video signal output from the composite encoder IC is converted from digital to
analog, and output from the connector panel (CP-317 board).
The output signal branches to two paths. Characters can be superimposed on VIDEO OUTPUT2.
The digital component video signal sent to the SDI-23 board is multiplexed with an audio signal, convert-
ed from parallel to serial, then output from the connector panel.
The digital component video signal sent to the DP-265/265A board is added in characters and scan-
converted in the vertical direction. After that, the video signal is performed for contrast adjustment, RGB
signal conversion, and gain adjustment. The signal is then sent to the color LCD monitor (VGA 640
x
480).
