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1.2
FEATURES
OVERVIEW
8083XDS-AD Analog and SD-SDI XDS Encoder
Figure 1-1 shows the typical waveform of the signal. The line 21 data
signal consists of a 7 cycle sine wave clock burst, a start bit, and two data
characters. Each character consists of seven data bits with odd parity.
The clock rate is 32 times the horizontal line frequency or 503.4 KHz. The
signal amplitude is 50 IRE units peak to peak. There is no setup on the
line when the caption signal is present. When caption data is encoded into
field 2, there must at least be null characters encoded into field 1. The full
specification for the caption data waveform and data content is given in the
EIA-608-B standard.
1.2.1
Hardware System Features:
•
3 RS-232 serial ports can be configured for direct connection to
captioning computer.
•
Rack mountable chassis.
•
16 digit alphanumeric display, with 8 push buttons.
•
Parallel remote port for GPI control of six important 8083 functions.
•
Real-time clock and calendar with battery backup.
•
Flash ROM program memory for easy in-system-programmable
firmware upgrades.
•
Optional redundant power supply.
1.2.2
Serial Digital Video Path Features:
•
Keys directly into 4:2:2 (525 or 625 line) digital video bitstream.
•
8 or 10 bit SDI video resolution supported.
•
Serial digital video input provides automatic cable equalization on cable
lengths up to 200 meters of low loss coax such as Belden 8281.
•
Two separate serial digital video outputs.
•
Serial Digital Video bypass relay activates automatically on power
failure to maintain the integrity of the program video path.
•
Analog composite monitor output with caption decoder provides a
means of verifying the caption information that is being encoded.
1.2.3
Component Analog Video Path Features
•
Keys directly into 1Vp-p component analog (525 or 625 line) video
signal.
•
User may select either analog or SDI video path as upstream data
source for data bridging applications.
•
XDS may be encoded onto both video feeds simultaneously when the
feeds are frame-locked.
•
Studio-quality video output with bypass relay protection.
•
Monitor output with caption and XDS decoder that provides a means of
verifying the information that is being encoded.
•
Video bypass relay activates automatically on power failure to maintain
the integrity of the program video path.
Revision 1.0.2
Page 1-3
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