6800/7000 Series - Audio and Video Multi/Demultiplexing Products Installation and Operation Manual
115
Block Diagram
Chapter 8: ENC/ENS/ENX-6801/M Encoder Modules and Accessories
Multi-Standard Encoder and Output Buffer
The multi-standard digital video signal encoding is done in U17
TDS6294 encoder chip. The encoder is capable of encoding all legal
colors which fulfill the diamond display with adequate headroom. The
adjustable parameters are listed.
See
“User-Controlled Parameters” on
page 116 for more information. There is a user adjustment group that
allows the user to correct luminance chrominance balance and hue if the
input signal requires correction. However, by a disable function, the
encoder can be easily switched to the
Calibrated
mode. The output of the
12-bit resolution D/A has a ±10% adjustment range. The U39 output
buffer can drive four double-terminated cable and has a cable pre-
equalization range of up to 50 m cable length.
Genlock
The composite output video is automatically color-frame locking. If a
blackburst reference signal is present, no selection is necessary. The
serial digital signal and the reference have to be frequency-locked and
the phase difference has to be within ±5 video lines for stable color-
frame locking. When color-frame locking is established, the phasing
adjustment range is according to specifications and referenced to the
serial digital input source.