Hd Fiber Features; Modular Construction - GRASS VALLEY LDK 4502 User Manual

Chapter 1 - Introduction

1.1.2 HD fiber features

The HD fiber system allows video transmission and remote control of cameras up to a distance
of 4,000 m (13,000 ft) and beyond, using industry standard fiber optic cable. It is based on
30MHz full-bandwidth 4:2:2 transmission (Y/Cr/Cb components).
The double sideband modulation technique used in combination with Y/Cr/Cb transmission
ensures linearity, resolution and an optimal signal-to-noise ratio over the maximum cable
length. Bandwidth efficient channel combining and equalization techniques minimize cross-talk
and interference. Teleprompter and viewfinder signals maintain high performance with
relatively long cable lengths.

1.1.3 Modular construction

The modular concept makes it easy to expand the functionality by simply adding new modules.
Quick exchange of the modules for servicing or the ability to swap modules between Base
Stations is another benefit.
The external video input module provides two analog video inputs and loop-through analog
outputs. The signal can be PAL or NTSC, and does not need to be clamped. It can also be non-
synchronized. The external video input module can be replaced in future by a digital one.
HDTV and simultaneous high-end SDTV
Besides standard high-definition outputs, the Base Station can be optionally equipped with
simultaneous high-end SDTV outputs. This offers ultimate flexibility: produce in SDTV one day,
and in HDTV the next, or do both simultaneously. Having both SDTV and HDTV outputs
facilitates a gradual and managed transition from STDV to HDTV. Three 1.5 Gb/s HD-SDI
outputs are available on the Base Station. The high quality SDTV Module adds three 270 Mb/s
SDI and three analog outputs (these can be programmed to be either R, G, B, or Y, Pr, Pb or
three CVBS outputs).
Monitoring
Monitoring in the analog HD video domain requires the monitoring module. The outputs on this
module provide four switchable signals (R, G, B and Y), which are simultaneously available on a
WFM and PXM connector. The switching is done in the digital video domain and can be
controlled from an OCP or MCP . The PXM output can be used for analog picture monitoring,
and the WFM output for monitoring on a waveform monitor. An additional conventional VGA
connector, which is also provided by this module, contains R, G, B, H-sync, and V-sync signals
for relative low-cost analog HD monitoring using an appropriate computer monitor. For
monitoring in the SD video domain, one of the SDI outputs or analog outputs of the High
Quality SDTV module can be used.
Audio and intercom
The audio and advanced intercom module provides 4-channel intercom and 2-channel audio
from the camera. The high-quality audio from the camera head is passed to the different
outputs via balanced line drivers on the module for clean transparent sound. The gain levels
can be remotely controlled.
In the installation menu of the Base Station, a choice is provided between a 4-wire or a 2-wire
intercom system. An intercom channel can be assigned as a data channel for private data. A
1kHz test-tone generator and voicemail extend the functionality even further. The voicemail
stores messages from a combination of sources like Program, Production or Engineering for
the camera operator. By adding the engineering intercom module, a 5-channel full-featured
intercom is possible.
14 LDK 4502/4503/4506 HDTV camera base station User's Guide (v3.5)