Leitch DEC-6002 User manual

DEC-6002 USER MANUAL
DIGITAL COMB-FILTER DECODER
For Service, please contact your local representative or:
Leitch Europe Leitch Inc. Leitch Asia
Holland Park House 111 Galway Place Unit 306B
Oldbury Teaneck, NJ 07666 HK Industrial Technology Centre
Bracknell, Berkshire USA 72 Tat Chee Avenue
ENGLAND Kowloon Tong
RG12 8TQ HONG KONG
Tel: [phone] [phone] [phone]
Fax: [phone] [phone] [phone]
All efforts have been made to ensure the accuracy of this manual. Should any errors be noticed, please
notify the above.
© Leitch Technology International Inc. 2001
The copyright in this document is the property of Leitch Technology International Inc and it may not be
copied, reproduced, used for manufacture, nor the contents divulged without the express permission in
writing of Leitch Technology International Inc.
All Rights Reserved.

Warranty
This Leitch product is warranted against defects in materials and workmanship for a
period of one year from the date of invoice. During the warranty period, Leitch will, at its
option, either repair or replace products which prove to be defective.
The warranty shall not apply to defects resulting from improper or inadequate
maintenance by Buyer, Buyer-supplied software or interfacing, unauthorised modification
or misuse, operation outside of the environmental specifications for the product, or
improper site preparation or maintenance.
Safety Considerations
General
This product and related documentation must be reviewed for familiarisation with safety
markings and instructions before operation. This product has been designed and tested
in accordance with international standards.
Safety Symbols
Indicates hazardous voltages
Indicates earth (ground) terminal
The WARNING sign denotes a hazard. It calls
attention to a procedure, practice, or the like, which, if
not performed or adhered to, could result in personal
injury. Do not proceed beyond a WARNING sign until
the indicated conditions are fully understood and met.
The CAUTION sign denotes a hazard. It calls
attention to an operating procedure, practice, or the
like, which if not correctly performed or adhered to,
could result in damage to or destruction of part or all of
the product. Do not proceed beyond a CAUTION sign
until the indicated conditions are fully understood and
met.
Safety Earth Ground
This is a Safety Class 1 product (provided with a protective earthing terminal). An
uninterruptible safety earth ground must be provided from the main power source to the
product input wiring terminals, power, cord, or supplied power cord set. Whenever it is
likely that the protection has been impaired, the product must be made inoperative and
secured against any unintended operation.

Before Applying Power
Verify that the product is configured to match the available main power source per the
input power configuration instructions provided in this manual.
Servicing
Any servicing, adjustment, maintenance or repair of this product must be performed only
by qualified personnel.
Adjustments described in this manual may be performed with power supplied to the
product while protective covers are removed. Energy available at many points may, if
contacted, result in personal injury.
Capacitors inside this product may still be charged even when disconnected from their
power source. To avoid a fire hazard, only fuses with the required current rating and of
the specified type (normal blow, time delay, etc.) are to be used for replacement.
Caution
This add on device, model DEC-6002, is intended to be installed in equipment in the
field, by the user, in the manufacturer’s defined operator access area. Check the
equipment operating/installation instructions and/or equipment manufacturer to
verify/confirm if your equipment is suitable (including power consumption) for user
installed application devices.
This product is for use with Leitch Genesis FR-6001, FR-6003 and FR-6004 frames.

CONTENTS
1. GENERAL DESCRIPTION. .......................................................................................... 1
2. INSTALLATION ............................................................................................................ 4
3. SPECIFICATION .......................................................................................................... 9
4. EDGE CONNECTIONS .............................................................................................. 10

Document Number: DEC-6002UM2.doc Issue 2
24th March 1998
1
1. General Description.
The Genesis DEC-6002 eurocard module is a precision adaptive comb filter decoder for
use in any application requiring translation from the analogue composite format to the
digital component format. All processing is carried out in the digital domain to full
broadcast quality, maintaining 10 bit accuracy from input to output. This multistandard
decoder accepts analogue composite sources in PAL, NTSC, PAL-M and PAL-N
standards with automatic detection of input line standard. Error detection and handling
signals are inserted onto the output to allow equipment downstream to verify
transmission integrity. The standard width module (SG6-1) has 4 serial digital outputs
and one looping composite analogue video input.
The DEC-6002 features Leitch’s 134,000 gate ASIC and represents the most
comprehensive comb-filter decoding system, able to gracefully adapt between its
decoding modes. The digital decoder can accept non-mathematical signals and includes
features such as digital 50% sync slicing for robust handling of imperfect sources.

Document Number: DEC-6002UM2.doc Issue 2
24th March 1998
2
DEC
6002
Video Gain
Chroma Gain
Black Level
NTSC Hue
Multi Use
Hex Switch
Default = 0
Remote/Local
VBI blanked/VBI passed
EDH off / EDH on
No Pedestal / Pedestal
525 / 625
PAL M & N / PAL I & NTSC
Coherent / Non-Coherent
Manual / Auto Detect
PAL M/N
Coherent
No I/P
+ 12V
625
Remote
User
+5V
Store

Document Number: DEC-6002UM2.doc Issue 2
24th March 1998
3
IC 34
IC 7
SW2
SW5 (not fitted on Issue A
and B PCB’s)
LK7 LK8
LK5
LK6
LK9
Note: LK5-LK9 Select
PSU options
A
-B = External Rails
B-C = Leitch Rails

Document Number: DEC-6002UM2.doc Issue 2
24th March 1998
4
2. Installation
Rearconnectors that cannot be used in the FR-6002 will be marked as being so.
When used in a FR-6004 the rearconnector interconnections are as shown in the
manual. When used in a FR-6002 or FR-6001 chassis the rearconnector is
mounted horizontally. This means for example connector A on an S6 will become
the left hand most connector.
S6 Rear Connector
Analogue Input F
Looping Analogue Output E See note below.
Serial Digital Output (270Mb/s) D
Serial Digital Output (270Mb/s) C
Serial Digital Output (270Mb/s) B
Serial Digital Output (270Mb/s) A
This equipment may be damaged by electrostatic discharge (ESD). Suitable
precautions must be observed to minimise the risk of ESD induced damage.
Note: If the looping analogue output is not utilised, then a 75 Ohm termination must
be fitted to BNC E.
Summary of Switch settings (see below for descriptions):
Switch No SW3 On (towards PCB surface) Off (away from PCB surface)
8Manual Standard Detect Auto Standard Detect
7Coherent input Non-Coherent input
6PAL-M or PAL-N PAL-I or NTSC
5525 line Standard 625 Line Standard
4Input has no pedestal Input has pedestal
3EDH off EDH on
2VBI Blanked VBI passed
1Remote Control (BO/S) Local Control
F
E
D
C
B
A

Document Number: DEC-6002UM2.doc Issue 2
24th March 1998
5
Switch No SW2 On (towards card ejector) Off (towards 64 way DIN)
7Complementary Decoding Anti Diff Phase Decoding
6Decoding adaption Select
5Decoding adaption Select
4Kill TRS Enable TRS
3Blank Line 21 (NTSC only) Pass Line 21 (NTSC only)
SW2.6 SW2.5 Decoding Mode
0 (off) 0 (off) adaption mode 0 (minimum adaption). Highest
luminance resolution.
0 (off) 1 (on) adaption mode 1 (more inclined to adapt than mode 0)
1 (on) 0 (off) adaption mode 2 (more inclined to adapt than mode 1)
1 (on) 1 (on) adaption mode 3 (maximum adaption). Minimum dot
crawl.
Note: On issue B PCB’s towards the front of the PCB is on and towards the 64 way
DIN is off for SW2. On issue C PCB’s towards the front of the PCB is off and
towards the 64 way DIN is on for SW2. A more detailed explanation of the
decoding modes can be found further on in the manual. The issue of the PCB
can usually be found on the underside of the PCB near the 64 way DIN.
LK's 5-9 select which power rails can be used on the card. When A-B is
shorted together on all these links the external power rails are utilised to
power the card and it will not function in a Leitch chassis. When B-C is shorted
together on all these links the normal +6.5 and -7.5V rails are used.
Front Switches (SW3)
Where possible, the up (off) (away from PCB surface) state is intended to be the default
and the down (on) (towards PCB surface) state is the less often used state. All switches
relate to SW3 on the front of the DEC-6002 board.
Switch no 8: Off selects auto standard detection. The board can distinguish between
525 and 625 line standards and between coherent and non-coherent
(e.g. VHS) sources. It can’t detect between PAL-M or PAL-N and NTSC
or PAL-I respectively, so this selection must be made manually on switch
6. Switch 8 on selects manual standard selection where switches 5,6
and 7 select the standard as described below.
Switch no 7: When switch 8 sets the manual mode, switch 7 selects between non-
coherent (off) and coherent (on) standards.
Switch no 6: Whether in auto or manual mode, switch 6 selects between PAL-I or
NTSC (off) and PAL-M or PAL-N (on) standards.
Switch no 5: When switch 8 sets manual mode, switch 5 selects between 625 line
(off) and 525 line (on) standards.

Document Number: DEC-6002UM2.doc Issue 2
24th March 1998
6
Switch no 4: When this switch is on, 525- line standards are assumed to have no
pedestal.
Switch no 3: Set this switch on to disable the insertion of EDH information in the
output signal.
Switch no 2: Set this switch on to blank VBI and off to pass VBI. Passing VBI is the
normal mode.
Switch no 1: Set this switch on to select remote control via BO/S and off for control
via the local front switches on the PCB.
Front Switches (SW2)
Switch no 7: Set this switch on to select complementary decoding, off to select anti
diff phase decoding.
Switch no 6: Decoding adaption selector. See Notes below
Switch no 5: Decoding adaption selector. See Notes below
Within SW2, switches 5 and 6 select the different modes of decoding adaptation
available from the DEC-6002 card. Switch 5 acts as the least significant bit and switch 6
as the most significant bit. So 00 (off,off) is decoding mode 0 and 10 (on,off) is decoding
method 2. Some further explanation follows.
Comb-Filter Decoding - Adaption modes
The DEC-6002 comb-filter decoder applies a 3 line comb-filter aperture where-ever the
three lines contain consistent colour information. By compensating for the change in
subcarrier phase over these three lines it is possible to combine the signals in such a
way that the luminance information is separated from the chrominance. This allows the
full luminance bandwidth to be recovered. Where the three lines do not contain
consistent colour information it is no longer appropriate to combine them in this way. The
decoder must ADAPT into an alternative decoding mode. The four adaption modes
affect the methods used to detect vertical changes in colour (vertical chrominance
transitions).
Luminance information close to the subcarrier frequency may change phase over the
three lines. This is mathematically identical to a signal which has resulted from a colour
change over the three lines. Where this signal has resulted from high frequency
luminance information comb-filtering is appropriate. However if a colour change has
produced the signal the decoder should adapt to an alternative decoding mode. As a
result there is a trade-off between detecting chrominance transitions and incorrectly
switching out the comb-filter in the presence of high frequency luminance.
Adaption mode 3 (maximum adaption) is the least likely to miss a vertical chrominance
transition. It will produce minimum dot crawl in the decoded picture.
At the other extreme adaption mode 0 is the least likely to incorrectly adapt in areas of
the picture which contain luminance detail. It will produce higher levels of dot crawl but
will offer some increase in luminance detail.

Document Number: DEC-6002UM2.doc Issue 2
24th March 1998
7
Adaption modes 1 and 2 offer intermediate levels of adaption.
The selection between the decoding modes is a subjective issue and will be largely
dependent on the demands of the application.
Switch no 4: Set this switch on to kill TRS on the output when there is no input
present. Off to enable TRS's on the output when there is no input.
Switch no 3: Set this switch on to blank line 21 Closed Captions (NTSC only), and off
to pass line 21.
Adjustments
Pots are labelled on board as Video gain, Chroma gain etc. and are mounted on the top
front edge of the PCB.
Video Gain: Adjusts the gain of the input with a range of zero to double (+6dB) gain.
Held to pre-set value when hex switch is set to zero.
Chroma Gain: Adjusts the gain of the input with a range of zero to double (+6dB) gain.
Held to pre-set value when hex switch is set to zero.
Black Level: Shifts the input with a range of -100mV to +100mV. Held to pre-set value
when hex switch is set to zero.
NTSC Hue: In the NTSC standard only, allows the chroma phase to be adjusted up
to 90 degrees either side of normal. Held to pre-set value when hex
switch is at zero.
Multi-Use: This is intended to provide various extra adjustments with the hex switch
selecting the function. As yet, no extra functions have been
implemented.

Document Number: DEC-6002UM2.doc Issue 2
24th March 1998
8
Hex Switch: When the hex switch is at zero, all the pot functions are inactive and set
to their pre-set values. In any other switch setting (1 to F), the pots are
active. The function of the USER led (see diagram page 2)is also
controlled by the HEX switch. In position 1 this led will turn OFF as the
VIDEO GAIN pot is adjusted to it’s detent position. Note that this is a
very precise adjustment. In positions 2,3 and 4, the led will indicate the
CHROMA GAIN,BLACK LEVEL and NTSC HUE detent position
respectively.
HEX SWITCH
POSITION
FUNCTION USER LED CONTROLS
ACTIVE
0CONTROLS AT PRESET OFF NO
1CONTROLS ACTIVE VIDEO GAIN at preset YES
2CONTROLS ACTIVE CHROMA GAIN at preset YES
3CONTROLS ACTIVE BLACK LEVEL at preset YES
4CONTROLS ACTIVE NTSC HUE at preset YES
5 to B CONTROLS ACTIVE OFF YES
CCONTROLS ACTIVE & TEST MODE TEST USE ONL
Y
YES
DCONTROLS ACTIVE OFF YES
ECONTROLS ACTIVE & LINE COUNT TEST USE ONL
Y
YES
FCONTROLS ACTIVE & NON-PRESET
INDICATION.
ON if any of above 4
controls is not at preset.
YES

Document Number: DEC-6002UM2.doc Issue 2
24th March 1998
9
3. Specification
Mechanical
Length 220mm
Width 100mm
Height 18mm
Weight 250g
Electrical
Power Consumption 11.7W (1.8A @ 6.5V)
Delay 70us
Frequency Response +0.1dB to 5.5MHz
Return Loss >40dB
Subcarrier Rejection >50dB
transient response <0.2%K rating
diff. phase error <1 degree
diff. gain error <1%
Chroma-Luma delay inequality <2ns
1st Active Line Last Active Line
VBI Handling 625 525 625 525
6/319 10/273 310/623 263/525
Process Control Adjustment Range:
Video Gain +6dB
Chroma Gain +6dB
Black Level +100mV
NTSC Hue +90 degrees

Document Number: DEC-6002UM2.doc Issue 2
24th March 1998
10
4. Edge Connections
Row A Function Row B Function
Pin 1A Analogue I/P Pin 1B Gnd
Pin 2A Pin 2B
Pin 3A Pin 3B
Pin 4A Pin 4B
Pin 5A Looping Analogue O/P Pin 5B Gnd
Pin 6A Pin 6B
Pin 7A Gnd (Iss C PCB) Pin 7B Gnd (Iss C PCB)
Pin 8A Pin 8B
Pin 9A Serial O/P Pin 9B Gnd
Pin 10A +5V In (Iss C PCB) Pin 10B +5V In (Issue C PCB)
Pin 11A +3.3V In (Iss C PCB) Pin 11B +3.3V In (Iss C PCB)
Pin 12A +12V In (Iss C PCB) Pin 12B -12V In (Iss C PCB)
Pin 13A Pin 13B
Pin 14A Pin 14B
Pin 15A -7.5V Pin 15B -7.5V
Pin 16A Gnd Pin 16B Gnd
Pin 17A +6.5V Pin 17B +6.5V
Pin 18A Pin 18B
Pin 19A BO/S Flag (Iss C PCB) Pin 19B BO/S PCB Sel (Iss C PCB)
Pin 20A Pin 20B
Pin 21A Pin 21B
Pin 22A Pin 22B
Pin 23A Pin 23B
Pin 24A Serial O/P Pin 24B Gnd
Pin 25A COM1 A (Iss C PCB) Pin 25B COM1 B (Iss C PCB)
Pin 26A COM2 A (Iss C PCB) Pin 26B COM2 B (Iss C PCB)
Pin 27A Pin 27B
Pin 28A Serial O/P Pin 28B Gnd
Pin 29A TKN Data (Iss C PCB) Pin 29B I2 Add (Iss C PCB)
Pin 30A TKN Clock (Iss C PCB) Pin 30B I2 Ret (Iss C PCB)
Pin 31A Pin 31B
Pin 32A Serial O/P Pin 32B Gnd