evertz 8025 User manual

Model 8025
Digital Video Keyer
Instruction Manual
© Copyright 1993, 1994, 1995
EVERTZ MICROSYSTEMS LTD.
3465 Mainway, Burlington, Ontario, Canada, L7M 1A9
Phone: [phone] Fax: [phone]
BBS: 905-335-9131
Internet: Tech Support: [email protected]
Sales: [email protected]
Web Page: http://www.evertz.com
Revision 1.4, Feb. 1995
The material contained in this manual consists of information that is the property of Evertz Microsystems and is
intended solely for the use of purchasers of the 8025 Digital Video Keyer. Evertz Microsystems expressly
prohibits the use of this manual for any purpose other than the operation of the 8025.
All rights reserved. No part of this publication may be reproduced without the express written permission of
Evertz Microsystems Ltd. Copies of this guide can be ordered from your Evertz products dealer or from Evertz
Microsystems.

INFORMATION TO USERS IN EUROPE
NOTE
CISPR 22 CLASS A DIGITAL DEVICE OR PERIPHERAL
This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to the European Union EMC directive. These limits are designed to
provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation
of this equipment in a residential area is likely to cause harmful interference in which
case the user will be required to correct the interference at his own expense.
INFORMATION TO USERS IN THE U.S.A.
NOTE
FCC CLASS A DIGITAL DEVICE OR PERIPHERAL
This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference in which case the
user will be required to correct the interference at his own expense.
WARNING
Changes or Modifications not expressly approved by Evertz Microsystems Ltd. could
void the user’s authority to operate the equipment.
Use of unshielded plugs or cables may cause radiation interference. Properly shielded
interface cables with the shield connected to the chassis ground of the device must be
used.

Model 8025 Digital Video Keyer Manual
REVISION HISTORY
REVISION DESCRIPTION DATE
1.0 Original issue - preliminary release Sept. 93
1.1 Revised to add 4Fsc support Dec. 93
1.2 Installations drawings revised May 94
1.3 Updated for Version B units Sept 94
1.4 Technical Description chapter added Feb. 95
Schematic drawings, component layouts & parts lists inserted

Model 8025 Digital Video Keyer Manual
TABLE OF CONTENTS i
TABLE OF CONTENTS
1. OVERVIEW ................................................................................................................................. 1-1
1.1. HOW TO USE THIS MANUAL.................................................................................................... 1-1
1.2. DEFINITIONS.............................................................................................................................. 1-2
2. INSTALLATION .......................................................................................................................... 2-1
2.1. REAR PANEL ............................................................................................................................. 2-1
2.1.1. Digital Video Input Connections.................................................................................... 2-1
2.1.2. Digital Video Output Connections................................................................................. 2-2
2.1.3. Keyer Interface Connectors.......................................................................................... 2-2
2.1.4. Analog Monitor Connections......................................................................................... 2-3
2.1.5. Remote Control Connections........................................................................................ 2-3
2.1.6. Power Connections....................................................................................................... 2-4
2.2. MOUNTING................................................................................................................................. 2-4
2.3. POWER REQUIREMENTS.........................................................................................................2-4
2.3.1. Selecting the Correct Mains Voltage............................................................................. 2-4
2.3.2. Changing the Fuse........................................................................................................2-4
2.4. CONNECTING THE DIGITAL VIDEO......................................................................................... 2-5
2.4.1. Video Input.................................................................................................................... 2-5
2.4.2. Video Output................................................................................................................. 2-6
2.5. CONNECTING THE KEYER CONTROLS.................................................................................. 2-6
2.5.1. Connecting the Reference Sync Output ....................................................................... 2-6
2.5.2. Connecting the Keyer Control and Fill.......................................................................... 2-6
2.6. CONNECTING THE 8025 TO A 4025 FILM FOOTAGE ENCODER.......................................... 2-7
2.6.1. Connecting the 4025 and 8025 for Digital VITC Keying ............................................... 2-7
2.6.2. Connecting the 4025 and 8025 for Digital and Analog VITC Keying............................ 2-9
3. HOW TO OPERATE DIGITAL VIDEO KEYER........................................................................... 3-1
3.1. AN OVERVIEW OF KEY AND DISPLAY FUNCTIONS.............................................................. 3-1
3.1.1. The Setup Pushbutton Group....................................................................................... 3-2
3.1.2. The Function Pushbutton Group................................................................................... 3-2
3.1.3. An Overview of the Status Indicators............................................................................ 3-3
3.1.4. Front Panel Operating Messages................................................................................. 3-3
3.1.5. An Overview of the Front Panel Programming Menu ................................................... 3-4
3.2. PROGRAMMING THE 8025 OPERATIONAL MODES.............................................................. 3-5
4. TECHNICAL DESCRIPTION ...................................................................................................... 4-1

Model 8025 Digital Video Keyer Manual
TABLE OF CONTENTS ii
4.2. JUMPERS AND SWITCHES.......................................................................................................4-1
4.2.1. DIP Switch Functions.................................................................................................... 4-1
4.2.2. Jumper Functions - Main Board.................................................................................... 4-2
4.3. CIRCUIT DESCRIPTION............................................................................................................. 4-2
4.3.1. Microcontroller (8025-36).............................................................................................. 4-3
4.3.2. Front Panel Display and Pushbuttons (5220-31).......................................................... 4-4
4.3.3. Parallel Digital Video Input and Output (8025-31) ........................................................ 4-4
4.3.4. Test Generator Oscillator (8025-37)............................................................................. 4-4
4.3.5. Serial Digital Video Input (8025-33).............................................................................. 4-5
4.3.6. Serial Digital Video Output (8025-34)........................................................................... 4-5
4.3.7. Input Multiplexer and Keyer LCA (8025-32, 8025-25, 8025-37)................................... 4-6
4.3.8. Analog Composite Monitor (8026-31, 8026-32)............................................................ 4-6
Figures
Figure 2-1: 8025 Rear Panel........................................................................................................2-1
Figure 2-2: Digital Video Input Connectors...................................................................................2-1
Figure 2-3: Digital Video Output Rear Panel Connections ...........................................................2-2
Figure 2-4: Keyer Rear Panel Connections..................................................................................2-2
Figure 2-5: Analog Monitor Rear Panel Connections...................................................................2-3
Figure 2-6: Connections to a 4025 Film Footage Encoder for Digital VITC Keying
(version A with 8 digit display)......................................................................................................2-8
Figure 2-7: Connections to a 4025 Film Footage Encoder for Digital VITC Keying
(version B with 12 digit display)....................................................................................................2-9
Figure 2-8: Connections to a 4025 for Digital and Analog VITC Keying
(version A with 8 digit display)....................................................................................................2-10
Figure 2-9: Connections to a 4025 for Digital and Analog VITC Keying
(version B with 12 digit display)..................................................................................................2-11
Figure 3-1: Version A Front Panel Layout ....................................................................................3-1
Figure 3-2: Version B Front Panel Layout ....................................................................................3-1
Figure 3-3: Overview of the 8025 Programming Menu System....................................................3-5
Figure 4-1: DIP Switch Functions.................................................................................................4-1
Figure 4-2: Block Diagram............................................................................................................4-3
Drawings......................................................................................................................Drawing #
Parallel Video I/O Schematic............................................................................................. 8025-31F
Serial / Parallel Mux And I/O Schematic............................................................................ 8025-32F
Serial Video Input Schematic ............................................................................................8025-33F
Serial Video Output Schematic.......................................................................................... 8025-34F
Digital Video LCA Schematic............................................................................................. 8025-35F
Microprocessor And Eprom Schematic ............................................................................. 8025-36F
Monitor Submodule Header, Tri Oscillator And Control Inputs Schematic....................... 8025-37F
Power Supply Dip Switch And Display Header Schematic................................................ 8025-38F
Clock Buffer And Phase Restorer Schematic.................................................................... 8025-39F
Main Board Component Layout......................................................................................... 8025-80F
Display Board Schematic ..................................................................................................5220-31B
Display Board Component Layout.....................................................................................5220-85C
Video Encoder...................................................................................................................8029-30B
Digital I/O Submodule Headers.........................................................................................8029-31B
Option CC D’Code Circuit..................................................................................................8029-32B
Top Component Layout.....................................................................................................8029-80B

Model 8025 Digital Video Keyer Manual
TABLE OF CONTENTS iii
Bottom Component Layout................................................................................................8029-81B
Power Supply Schematic...................................................................................................8102-31A
Power Supply Component Layout.....................................................................................8102-80A
Parts Lists .................................................................................................................Parts List #
8025 Main Board...........................................................................................................BAM8025DK
5220 Display Board.......................................................................................................BAM5220DS
Video Encoder 8025, 8070 Submodule......................................................................... BAS8029VE
8102 Power Supply .......................................................................................................BAM8102PS
Misc. Items ...........................................................................................................................MA5000

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Model 8025 Digital Video Keyer Manual
OVERVIEW Page 1-1
1. OVERVIEW
The Model 8025 Digital video keyer provides a cost effective method of
keying vertical Interval time code or other similar signals into the digital
video bitstream.
Features:
• Keys directly into digital video bitstream
• Accepts 525 or 625 component (4:2:2) or composite (4Fsc) digital
video signals
• Parallel digital video input and output standard
• Optional Serial digital video input provides automatic cable equalization
on cable lengths up to 200 meters of low loss coax such as Belden
8281
• Optional Serial digital video output provides two separate outputs.
• Reference sync output extracted from the digital video to gen lock
equipment which is providing the key signals
• Keyer bypass mode allows video to pass through without keying any
signal in
• Built in digital video bar generator can be used for quickly verifying the
connections through your digital video system.
• Rack mountable
• 8 or 10 bit resolution
• 8 digit Alpha-numeric display, with 8 push buttons
• User setups programmed from the front panel make it easy to
reconfigure the 8025 for different applications. Configuration is recalled
from non-volatile memory on power up
• Optional Analog composite monitor output
1.1. HOW TO USE THIS MANUAL
This manual is organized into 4 chapters : Overview, Installation, and
Operation, Technical Description.
If you are currently an owner of the Evertz 4025 Film Footage Encoder, you
will find special information on connecting your digital keyer to the 4025
marked with the following symbol in the margin.
Items of special note for all users are marked with a double box like this.
4025
!
"

Model 8025 Digital Video Keyer Manual
OVERVIEW Page 1-2
1.2. DEFINITIONS
AES (Audio Engineering Society): A professional organization that
recommends standards for the audio industries.
AES/EBU:Informal name for a digital audio standard established jointly by
the Audio Engineering Society and the European Broadcasting
Union organizations.
ANALOG: An Adjective describing any signal that varies continuously as
opposed to a digital signal that contains discrete levels
representing digits 0 and 1.
A-TO D CONVERTER (ANALOG-TO-DIGITAL): A circuit that uses
digital sampling to convert an analog signal into a digital
representation of that signal.
BIT: A binary representation of 0 or 1. One of the quantized levels of
a pixel.
BIT PARALLEL: Byte-wise transmission of digital video down a multi-
conductor cable where each pair of wires carries a single bit.
This standard is covered under SMPTE 125M, EBU 3267-E and
CCIR 656.
BIT SERIAL: Bit-wise transmission of digital video down a single
conductor such as coaxial cable. May also be sent through
fiber optics. This standard is covered under SMPTE 259M and
CCIR 656.
BIT STREAM:A continuous series of bits transmitted on a line.
BNC: Abbreviation of "baby N connector". A cable connector used
extensively in television systems.
BYTE: A complete set of quantized levels containing all the bits. Bytes
consisting of 8 to 10 bits per sample are typical in digital video
systems.
CABLE EQUALIZATION: The process of altering the frequency
response of a video amplifier to compensate for high frequency
losses in coaxial cable.
CCIR (International Radio Consultative Committee) An international
standards committee.
CCIR-601:An international standard for component digital television from
which was derived SMPTE 125M and EBU 3246-E standards.
CCIR-601 defines the sampling systems, matrix values and filter

Model 8025 Digital Video Keyer Manual
OVERVIEW Page 1-3
characteristics for both Y, B-Y, R-Y and RGB component digital
television signals.
CCIR-656 The physical parallel and serial interconnect scheme for
CCIR-601. CCIR-656 defines the parallel connector pinouts as
well as the blanking, sync and multiplexing schemes used in
both parallel and serial interfaces. It reflects definitions found in
EBU Tech 3267 (for 625 line systems) and SMPTE 125M
(parallel 525 line systems) and SMPTE 259M (serial 525 line
systems).
COMPONENT ANALOG: The non-encoded output of a camera, video
tape recorder, etc., consisting of the three primary colour
signals: red, green, and blue (RGB) that together convey all
necessary picture information. In some component video
formats these three components have been translated into a
luminance signal and two colour difference signals, for example
Y, B-Y, R-Y.
COMPONENT DIGITAL: A digital representation of a component
analog signal set, most often Y, B-Y, R-Y. The encoding
parameters are specified by CCIR-601. The parallel interface is
specified by CCIR-656 and SMPTE 125M.
COMPOSITE ANALOG: An encoded video signal such as NTSC or
PAL video, that includes horizontal and vertical synchronizing
information.
COMPOSITE DIGITAL: A digitally encoded video signal, such as
NTSC or PAL video, that includes horizontal and vertical
synchronizing information.
D1: A component digital video recording format that uses data
conforming to the CCIR-601 standard. Records on 19 mm
magnetic tape. (Often used incorrectly to refer to component
digital video.)
D2: A composite digital video recording format that uses data
conforming to SMPTE 244M. Records on 19 mm magnetic
tape. (Often used incorrectly to refer to composite digital video.)
D3: A composite digital video recording format that uses data
conforming to SMPTE 244M. Records on 1/2" magnetic tape.
EBU (European Broadcasting Union): An organization of European
broadcasters that among other activities provides technical
recommendations for the 625/50 line television systems.
EBU TECH 3267-E: The EBU recommendation for the parallel interface
of 625 line digital video signal. This is a revision of the earlier

Model 8025 Digital Video Keyer Manual
OVERVIEW Page 1-4
EBU Tech 3246-E standard which was in turn derived from
CCIR-601.
EMBEDDED AUDIO: Digital audio is multiplexed onto a serial digital video
data stream.
PIXEL: The smallest distinguishable and resolvable area in a video
image. A single point on the screen. In digital video, a single
sample of the picture. Derived from the words picture element.
RESOLUTION: The number of bits (four, eight, ten, etc.) determines
the resolution of the signal. Eight bits is the minimum resolution
for broadcast television signals.
4 bits = a resolution of 1 in 16.
8 bits = a resolution of 1 in 256.
10 bits = a resolution of 1 in 1024.
SERIAL DIGITAL: Digital information that is transmitted in serial form.
Often used informally to refer to serial digital television signals.
SMPTE (Society of Motion Picture and Television Engineers): A
professional organization that recommends standards for the
film and television industries.
SMPTE 125M: The SMPTE standard for bit parallel digital interface
for component video signals. SMPTE 125M defines the
parameters required to generate and distribute component
video signals on a parallel interface.
SMPTE 244M: The SMPTE standard for bit parallel digital interface
for composite video signals. SMPTE 244M defines the
parameters required to generate and distribute composite video
signals on a parallel interface.
SMPTE 259M: The SMPTE standard for 525 line serial digital
component and composite interfaces.
TRS: Timing reference signals used in composite digital systems.
(It is four words long).
TRS-ID: Abbreviation for "Timing Reference Signal Identification". A
reference signal used to maintain timing in composite digital
systems. (It is four words long.)
4:2:2 A commonly used term for a component digital video format.
The details of the format are specified in the CCIR-601
standard. The numerals 4:2:2 denote the ratio of the sampling
frequencies of the luminance channel to the two colour
difference channels. For every four luminance samples, there
are two samples of each colour difference channel.

Model 8025 Digital Video Keyer Manual
OVERVIEW Page 1-5
4Fsc Four times subcarrier sampling rate uses in composite digital
systems. In NTSC this is 14.3 MHz. In PAL this is 17.7 MHz.

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OVERVIEW Page 1-6
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Model 8025 Digital Video Keyer Manual
INSTALLATION Page 2-1
2. INSTALLATION
2.1. REAR PANEL
MONITOR
VIDEO
SERIAL
OUT
REF SYNC
PARALLEL
DIGITAL OUT
FILL
KEY INPUTS
TEST
OUT
1
CTL
2230V:
.125 A
DIGITAL IN
PARALLEL SERIAL
MICROSYSTEMS LTD
.25 A
FUSE
115V:
PARALLEL
SERIAL
REM
CTL
MADE IN CANADA
evertz
Figure 2-1: 8025 Rear Panel
The following sections describe the purpose of the rear panel connectors of
the 8025. Sections 2.1.1 to 2.1.6 describe the specific signals that should
be connected to the 8025. Figure 2-6 to Figure 2-9 give sample connection
diagrams for connecting the 8025 Digital Video Keyer to your 4025 Film
Footage Encoder.
2.1.1. Digital Video Input Connections
230V:
.125 A
DIGITAL IN
PARALLEL SERIAL
MICROSYSTEMS LTD
.25 A
FUSE
115V:
L
LEL
I
AL
MADE IN CANADA
evertz
Figure 2-2: Digital Video Input Connectors
Selection of the active digital video input is controlled from the front panel.
The serial digital video input is optional and may not be fitted on your unit.
PARALLEL: A Female 25 pin D connector for input of 8 or 10 bit parallel
digital video signals compatible with the SMPTE 125M, SMPTE
244M or EBU Tech 3267-E standards.
SERIAL: A BNC connector for input of 10 bit serial digital video signals
compatible with the SMPTE 259M standard.
!

Model 8025 Digital Video Keyer Manual
INSTALLATION Page 2-2
2.1.2. Digital Video Output Connections
MONITOR
VIDEO
SERIAL PARALLEL
DIGITAL OUT
1
Figure 2-3: Digital Video Output Rear Panel Connections
Both the serial and parallel outputs contain the selected input video with
data keyed in by Keyer 2. The serial digital video output is optional and may
not be fitted on your unit.
PARALLEL: A Female 25 pin D connector for output of 8 or 10 bit parallel
digital video signals compatible with the SMPTE 125M, SMPTE
244M or EBU Tech 3267-E standards. This video will be the
selected video input with data inserted onto it.
SERIAL: Two BNC connectors for output of 10 bit serial digital video
signals compatible with the SMPTE 259M standard. This video
will be the selected video input with data inserted onto it.
2.1.3. Keyer Interface Connectors
OUT
REF SYNC
FILL
KEY INPUTS
TEST
OUT
1
CTL
2PAR
A
SE
R
REM
CTL
Figure 2-4: Keyer Rear Panel Connections
CTL 1 A BNC connector for input of a TTL level Key signal. This active
low signal is used to determine when Keyer 1 will be active.
FILL 1 A BNC connector for input of a TTL level Key Fill signal. This
signal is inserted into the digital video path assigned to Keyer 1
when the KEY CTL 1 signal is low.
CTL 2 A BNC connector for input of a TTL level Key signal. This active
low signal is used to determine when Keyer 2 will be active.
FILL 2 A BNC connector for input of a TTL level Key Fill signal. This
signal is inserted into the digital video path assigned to Keyer 2
when the KEY CTL 2 signal is low.
!

Model 8025 Digital Video Keyer Manual
INSTALLATION Page 2-3
On 8025 units with an 8 digit display there was a labeling error on the rear
panel connections. The actual functions of the CTL and Fill connectors are
reversed. The FILL2 connector is actually the one labelled CTL 2 and the
CTL 2 connector is actually the one labeled FILL 2.
REF SYNC OUT A BNC connector for output of an analog reference
sync signal, extracted from the digital video input. This signal is
used to genlock the equipment that is generating the keyer
control and fill signals.
TEST OUT A BNC connector for output of test signals from the 8025.
This signal is used for various diagnostics purposes, and is not
required for normal operation.
2.1.4. Analog Monitor Connections
MONITOR
VIDEO
SERIAL PARALLEL
DIGITAL OUT
Figure 2-5: Analog Monitor Rear Panel Connections
The analog composite monitor output is optional and may not be fitted on
your unit.
MONITOR VIDEO: A BNC output of the optional composite analog
encoder. The input to this encoder can be selected from either
the keyer 1 or keyer digital video path.
2.1.5. Remote Control Connections
SERIAL: A 9 pin female 'D' connector for connection to a computer for
remote control of the 8025. (Future use)
PARALLEL: A 9 pin female 'D' connector for connection to 'closure to
ground' remote control signals. (Future use)
2.1.6. Power Connections
LINE: The 8025 may be set for either 115v/60 Hz or 230v/50 Hz AC
operation. The voltage selector switch is accessible on the rear
!

Model 8025 Digital Video Keyer Manual
INSTALLATION Page 2-4
panel. The line voltage connector contains an integral slow
blow fuse (and a spare one).
2.2. MOUNTING
The 8025 Digital Video Keyer is equipped with a rack mounting tray and fits
into a standard 19 inch by 1 3/4 inch (483 mm x 45 mm) rack space. The
8025 may be removed from the rack mounting tray if rack mounting is not
desired.
2.3. POWER REQUIREMENTS
2.3.1. Selecting the Correct Mains Voltage
Power requirements are 115 or 230 volts AC at 50 or 60 Hz, switch
selectable on the rear panel. Power should be applied by connecting a 3
wire grounding type power supply cord to the power entry module on the
rear panel. The power cord should be minimum 18 AWG wire size, type
SVT marked VW-1, maximum 2.5 m in length.
Before connecting the line power, be sure to select the proper line voltage.
Also, check that the line fuse is rated for the correct value marked on the
rear panel.
The power entry module combines a standard IEC 320 power inlet
connector, voltage selector switch, two 5 x 20 mm fuse holders (one active,
one spare) and an EMI line filter.
To change the mains voltage setting, open the cover of the power entry
module using a small screwdriver. Remove the drum selector switch, and
re-insert it so that the desired voltage is visible through the opening on the
mains connector cover. Check that the correct fuse is in use as shown in
section below.
2.3.2. Changing the Fuse
The fuse holder is located inside the power entry module. To change the
fuse, open the cover of the power entry module using a small screwdriver.
The fuse holder on the bottom contains the active fuse. The one at the top
contains a spare fuse. Pull the bottom fuse holder out and place a fuse of
the correct value in it. Use slo blo (time delay) 5 x 20 mm fuses rated for
250 Volts with the following current ratings:
For 115 Volt operation 250 mA
!

Model 8025 Digital Video Keyer Manual
INSTALLATION Page 2-5
For 230 Volt operation 125 mA
Make sure that the arrow is pointing down when you replace the fuse
holder. Close the door on the power entry module and connect the mains
voltage.
Never replace with a fuse of greater value.
2.4. CONNECTING THE DIGITAL VIDEO
2.4.1. Video Input
The 8025 requires that a digital video source be connected to either the
PARALLEL or SERIAL video inputs. (The SERIAL digital video input is
optional and may not be fitted on your unit.) Selection of either the
PARALLEL or SERIAL input is accomplished on the front panel, if the serial
input option is installed.
The 8025 may be configured to accept either 525 or 625 digital video in
either component (4:2:2) or composite (4Fsc) format. Selection of the
correct video type is accomplished using the front panel menu system.
As of the time of this writing the PAL composite (4Fsc) video format is not
supported.
The SER and PAR LED's indicate which input is active and if there is video
present. When either the SER or PAR LED is blinking it indicates that
there is no video present on the selected input. (See section Error!
Reference source not found. for information on selecting the video input
setting).
The VIDEO TYPE parameter on the front panel menu must be set correctly
to match the video input. (See section Error! Reference source not
found. for information on changing the video type setting).
2.4.2. Video Output
The 8025 has two internal video paths that may be assigned to either
Keyer 1 or Keyer 2. One path leads to the PARALLEL Video output, and
the other path leads to the SERIAL Video output. (The serial output is
optional and may not be fitted on your unit.)
!
!

Model 8025 Digital Video Keyer Manual
INSTALLATION Page 2-6
As of the time of this writing only Keyer 2 is supported. Keyer 2 is always
assigned to both the serial and parallel outputs
The PARALLEL digital video output contains the video from the selected
input with data keyed in by Keyer 2. Connect this output to any input on
your system that accepts 8 or 10 bit digital video in the selected format.
The SERIAL outputs contain the video from the selected input with data
keyed in by Keyer 2. Connect one of these outputs to any input on your
system that accepts 8 or 10 bit SERIAL digital video in the selected format.
Two identical SERIAL digital video outputs are provided.
2.5. CONNECTING THE KEYER CONTROLS
2.5.1. Connecting the Reference Sync Output
The 8025 extracts a composite sync from the input digital video bitstream
and outputs this analog video level signal on the REF SYNC output BNC.
The REF SYNC output has been re-timed to compensate for the internal
delays in decoding the SYNC from the digital video. The REF SYNC must
be connected to the input video or genlock input connector on the device
that is generating the KEY FILL and KEY CTL data.
2.5.2. Connecting the Keyer Control and Fill
The 8025 accepts two signals to drive the keyer. Identical inputs are
provided for each of the keyers in the 8025.
Provision is made for two independent keyer paths inside the 8025.
However at this time only keyer 2 is implemented. All references to Keyer 1
throughout this manual should be ignored at this time.
The KEY CTL is an active low signal that controls where in a line and which
lines in the field the keyer will be active. The KEY FILL contains the actual
pixel data that will be keyed in to the digital video bitstream. When the
KEY CTL signal is active (low) the 8025 samples the KEY FILL signal at
each digital clock and keys in a digital black value if the KEY FILL is low
and a digital white value if the Key FILL is high. The exact data values that
are keyed in depend on the video type and standard that have been
selected from the front panel of the 8025.
To avoid sampling problems caused by slight differences in the digital
video clock rate and the KEY FILL pixel rate, it is recommended that the
!
!

Model 8025 Digital Video Keyer Manual
INSTALLATION Page 2-7
Key Fill pixel clock be synchronized to the REF SYNC out from the 8025
where possible.
2.6. CONNECTING THE 8025 TO A 4025 FILM FOOTAGE ENCODER
There are two different versions of 8025 hardware. Version A has an 8 digit
display located on the right hand side of the gray front panel. Version B has
an 12 digit display located in the middle of the black front panel. The silk
screening on version A rear panel had the Key CTL and Key Fill inputs
reversed. Please use the correct configuration drawing for the version you
have to confirm that you have the right connections.
There are two different methods of configuring the 4025 Film Footage
Encoder to work with the 8025 Digital Keyer. The first method is the
preferred configuration and is used where you want to key VITC into either
Component or Composite digital signals only. The other configuration is
useful particularly in composite digital facilities where you want to use the
4025 for both analog and digital keying. Sections 2.6.1 and 2.6.2 describe
these configurations in further detail. Figure 2-6 to Figure 2-9 gives sample
connection diagrams for connecting the 8025 Digital Video Keyer to your
4025 Film Footage Encoder in each of these configurations.
2.6.1. Connecting the 4025 and 8025 for Digital VITC Keying
Figure 2-6 (version A) and Figure 2-7 (version B) show the typical
connections required when using the 8025 in conjunction with the 4025
Film Footage Encoder for digital VITC keying. This is the preferred
configuration when using the 8025 and 4025.
The 4025 has internal jumpers located on the 6231 VITC keyer submodule
(top board in the centre location) which must be configured to permit its
operation in this mode. Remove the shorting jumpers from JPC1 and
JPD1 and install them on JPA1 and JPB1. Also make sure that Jumper
J33 on the 7006 I/O board is not installed.
Consult your 4025 manual section 5.3.1 and 5.3.5 for further information on
how to change the jumpers.
Connect the REF SYNC OUT of the 8025 to the GEN VIDEO IN of the
4025 and terminate it. Connect KEY CTL 2 of the 8025 to the 4025's
VITC OUT B and KEY FILL 2 of the 8025 to the 4025 VITC OUT A.
The 8025 must be set up to use TTL level input levels for the KEY controls.
This mode is accessible by using the Engineering Format menu and setting
the CTL LVL setting to Lvl ttl. See section 3.2 of this manual.
!
4025
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