Crystal Vision
Introduction
DEC105S User Manual R1.1
3
15/12/04
1 Introduction
The DEC105S is an analogue composite or Y/C to serial digital video decoder. It contains
a 10 bit synchroniser allowing the serial digital output to be timed to an analogue
reference. The DEC105S also has a serial digital (SDI) input. This allows it to be used as
a synchroniser, with some additional control over gains and timing.
Two main operating modes are supported, 10 bit for professional quality PAL or NTSC
video and 8 bit for less stable PAL or NTSC video, as is often the case with VHS or
satellite feeds.
The decoder is fitted with a 3 line adaptive comb decoder and Crystal Vision’s own
bandsplit decoder which gives excellent decoding without the artefacts of a comb. This is
recommended when using broadcast PAL material. It is also designed to accommodate
jittery or damaged signals and will automatically switch to its tolerant 8 bit decoder mode
when a non-stable signal is received.
The main features are as follows:
•
compact single height module
•
converts composite or Y/C signals to SDI
•
frame synchroniser with SDI input
•
10 bit adaptive comb and PAL bandsplit filtering plus 8 bit input modes
•
automatic or manual PAL/NTSC standard selection
•
adjustable timing, gain and black level
•
audio follow pulse for audio to video delay tracking
•
GPI outputs for 8 bit lock, SDI present, ref present, std & audio follow pulse
•
loop or terminate composite input and external analogue video reference input
•
card edge, Statesman and remote control facilities
The DEC105S is a 100mm x 266mm module, which fits in all standard frames and can be
integrated with any boards from the company’s full product range. It uses the single
height RM01, RM23, and RM24, double height RM27 and quad height RM25 rear
connectors in the Indigo and FR-AV range of Crystal Vision frames. Note quad height
rear modules are limited to the 2U and 4U frames.
