VISTEK V1667, V1667/SY & V1667/SY-VHS
12-bit pal/ntsc to sdi adaptive
comb filter decoder
4
Issue 3
1.
GENERAL DESCRIPTION
The V1667 is a 12 bit broadcast quality multi-standard adaptive comb filter decoder, and forms part of the
Vistek V1600 modular range of interface products. The 3U x 250mm card may be fitted into either the V1601
(1U) or V1603 (3U) 19” rack mountable enclosures, from which it derives its power. All signal inputs and
outputs are made via a passive rear module.
In its basic form, without a Frame Synchroniser fitted (
V1667
product), the unit converts an analogue colour
encoded composite video input to a 270Mbit component Serial Digital Video (SDV) output standard.
One of two Frame Synchroniser modules may be optionally fitted to the decoder. The standard Frame
Synchroniser module (fitted on the
V1667/SY
product) permits the output of the unit to be timed up to an
external reference, with a user programmable offset of up to + 127 lines relative to the reference. The
alternative module (fitted on the
V1667/SY-VHS
product) has the same functionality of the standard
synchroniser module, but also offers the facility to decode non-timebase corrected signals, specifically the
output of a VHS tape recorder.
VisLock
processing may be optionally factory fitted to the card. VisLock processing is a patented method of
converting an NTSC composite analogue signal to serial digital form (within the V1667), then subsequently
re-converting back to NTSC (within a Vistek V1668 encoder) with negligible loss of picture quality.
The V1667 has a high impedance looping input, into which the analogue colour encoded input is presented.
The card will detect, and consequently automatically decode, any of the standards listed below:-
PAL B, G, I, M, N
NTSC M, NTSC JAPAN
NTSC 443
The decoder may also be forced into any one of the specified standards, although it is generally
recommended that the user leave the card set in automatic (
AUTO
) mode.
The V1667 has four 270Mbit component Serial Digital Video (SDV) outputs.
Front panel controls enable the user to set up/adjust various operating parameters, and if a Frame
Synchroniser option is fitted they may be used to time the unit into an installation.
All parameter settings, for each standard, are stored in non-volatile memory. Thus a unit may be powered
down without the settings being lost.
