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Video Signal Processing Circuit
The DM-152 board has two circuits for the main-line system and the return system. In the main-line system circuit, the
OFDM-modulated signal from the camera is demodulated. Then video signals are transferred to the DPR-361 board. In
the return system circuit, the return video signals and the VBS prompter signal from the DPR-361 board are encoded,
OFDM-modulated, and are then sent back to the camera.
• In the main-line system circuit, the stream signal demodulated from the signal sent from the transmission block is
separated into video signals, audio signals, command signal, and trunk signal. The video signals are sent to the
CODEC IC to be decoded to baseband video signals. Video signals to be decoded to baseband by the CODEC IC,
audio signals, command signal, and trunk signal sent to the DPR-361 board.
• In the return system circuit, the return video signal from the DPR-361 board is sent to the CODEC IC to be encoded,
and is then sent to the OFDM modulation IC. The VBS prompter signal from the DPR-361 board is decoded by
the VBS decoder IC, and is then sent to the ENC-112 board to be encoded. The encoded signal is sent to the OFDM
modulation IC.
The OFDM modulation IC multiplexes the return/prompter signals, the command signal sent to the camera, and
the audio signal for the intercom to generate two-system signals (F7 + F9 and F8 waves), D/A-converts the
multiplexed signal, and then sends it to the transmission circuit.
In addition to these circuits for the main-line and return signal processing systems, the DM-152 board contains an
EEPROM that retains signals for the cable length determination adjustment data.
1-10-2.
ENC-112 Board
The small ENC-112 board located on the DM-152 board functions as a CODEC of video signals for the prompter.
The ICs on this board have MPEG2 encoding/decoding functions, and the CCU side uses the encoding function.
1-10-3.
DPR-361 Board
The DPR-361 board has the following functions.
Control Block
The DPR-361 board that contains a microcomputer SH2-DSP (IC100) controls the internal boards and power supply,
and performs settings for the system including camera. It also performs command communication with the camera,
RCP, and MSU.
Furthermore, this board enables LAN connection by the LAN controller that incorporates a microcomputer.
This board has an HD/SD signal generator and performs genlock with the external reference and between HD and SD
signals. Thus it controls entire video signal phases. It also can select HD tri-level sync signal or SD sync signal and
output it.
Audio Signal and Tally Processing
• D/A-converts and outputs the MIC signal sent from the DM-152 board.
• Selects and D/A-converts the intercom signals sent from the DM-152 board, and sends them to external circuits.
• A/D-converts the intercom signals and the PGM signal that are input to the unit, and sends them to the DM-152
board.
• R/G tally signal interface
HXCU-TX70
1-17
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