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SDI PROCESSING AMPLIFIER
INSTALLATION and OPERATION
© Vistek Electronics Ltd
Filename: V1642om.doc
Issue :
2
Date:
March 2001
VISTEK Electronics Ltd
Wessex Rd
Bourne End
Buckinghamshire, SL8 5DT
ENGLAND
Tel.
+44 1628 531221
Fax.
+44 1628 530980
Web:
www.vistek.tv
17 February, 2005
V1642
V1642OM.DOC
Page 1 of 9
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Summary of Contents for VISTEK V1642
- Page 1 V1642 SDI PROCESSING AMPLIFIER INSTALLATION and OPERATION © Vistek Electronics Ltd Filename: V1642om.doc Issue : Date: March 2001 VISTEK Electronics Ltd Wessex Rd Bourne End Buckinghamshire, SL8 5DT ENGLAND Tel. +44 1628 531221 Fax. +44 1628 530980 Web: www.vistek.tv 17 February, 2005 V1642OM.DOC...
- Page 2 Bypass The V1642 has a Fade to Black function which can be triggered from a remote control system, or by a contact closure. The duration is fixed at about half a second. The video is returned to its pre-fade, but adjusted setting on release of the contact closure.
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Page 3: Installation
2.1 REAR PANEL CONNECTIONS The rear module to be used with the V1642 is the same as that used with the V1645 Noise Reducer and V1647 Aspect Ratio Converter. Some early units were delivered with rear modules that did not have a D-type connector for GPI, in which case the Fade to Black input used two lower BNC connectors. -
Page 4: Insertion Delay
2.3 INSERTION DELAY SDI to SDI 32 clocks 1.188µs Parallel processing 25 clocks 0.925µs 2.4 HARDWARE The figure below shows diagrammatically the printed circuit board along with certain other components of interest. In particular it shows the position and orientation of the links and switches which set up the operation modes. -
Page 5: Front Panel
CAL and OFF LEDs (see below) DOWN Button RS485 REMOTE / LOCAL control selection Local V1642 Proc. Amp. The front panel shown above has three purposes: Provide the user with the operating conditions Offer Local control and indication of the primary controls Select the control source 2.5.1 Operating Conditions... - Page 6 2.7 ANCILLARY DATA AND VERTICAL INTERVAL The V1642 passes all ancillary data and all data in the active portion of the vertical interval unmodified. Thus all audio or Teletext or VITS is unaffected by the processing.
- Page 7 The standard V1642 contains EDH generation. This means a new correct EDH data packet is always created on the output. 1 March, 2005 V1642OM.DOC Page 7 of 9...
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Page 8: Operation
Since gain can be applied to the D1 signal it is possible to generate levels outside the normal 10 bit gamut of D1 and so limiting is required. The V1642 normally applies a soft form of limiting that progressively reduces the gain of a signal as it approaches the limits, either overshoot or undershoot. If this is not required then it can be disabled by putting LK4.2 to OFF. -
Page 9: Fade To Black
3.6 FADE TO BLACK The V1642 includes a fade to black facility. This enables the output to be cleanly attenuated to digital black on receipt of an external command. The rate of the fade is fixed at half a second.
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