6-2
DNW-A220
DNW-A220P
Sync system
A sync signal is generated on the TG-191/191P board. The signal input from the REF VIDEO IN or
VIDEO IN connector is sync-separated to produce a sync signal (sync or burst). For SDI input locking,
moreover, a sync signal is generated on the SDI-23 board by the signal input from the SDI IN connector.
Based on the generated sync signal, a REF signal and various timing signals (CF, GOP, FRAME , HD,
VD, and AUDIO ID signals) for the unit are generated on the TG-191/191P board . In addition, the video
and audio clock signals synchronized with this sync signal are generated and sent to each board together
with timing signals.
(2) Audio Signal Processing Block (CP-316, KY-400/406, AU-249, SDI-23, APR-27,
and HP-88 Boards)
The analog audio signal input from the external equipment to the AUDIO IN connector (on the CP-316
board) is switched in an input level on the CP-316 board and controlled in a level on the KY-400 or KY-
406 board. The resultant signal is sent to the AU-249 board. On the CP-316 board, phantom power is also
supplied.
An automatic gain control (AGC) is applied to the audio signal sent to the AU-249 board. This audio
signal and the Dolby noise-reduced analog Betacam PB audio signal are switched and emphasized. The
resultant signal is converted from analog to digital and sent to the APR-27 board. For the SDI signal input
from the external equipment to the SDI In connector, an audio signal and various control signals (mute
flag, Z flag, and C bit signals) are extracted on the SDI-23 board and sent to the APR-27 board.
On the APR-27 board, five-field sequence processing (for NTSC only) and JOG processing are performed
for the SX PB audio signal sent from the DPR-87 board.
This SX PB audio signal, the analog input signal sent from the AU-249 board, and the SDI input signal
sent from the SDI-23 board are switched, swap in channels, mixed in channels, and muted. These signals
are then sent to the boards below.
REC signal: To the DPR-87 board
LINE and MONITOR output signals: To the AU-249 board
SDI output signal: To the SDI-23 board
The LINE output signal sent to the AU-249 board is converted from digital to analog and de-emphasized.
The signal is then output through the output amplifier on the CP-316 board from the connector panel.
The MONITOR output signal sent to the AU-249 board is converted from digital to analog and de-
emphasized. The output signal is then gain-controlled on the HP-88 board and output through the output
amplifier on the CP-316 board from the connector panel.
The MONITOR output signal can also be monitored using headphones or speaker.
The channel type of the signal to be output to the LINE and MONITOR output connectors can be set
using a sub LCD menu.
The output audio signal sent to the SDI-23 board is multiplexed with a video signal using an SDI encoder,
converted from parallel to serial, and output from the connector panel.
