evertz 7700 Series User manual

7700 MultiFrame Manual
7730DAC Component D to A
1. OVERVIEW .......................................................................................................................... 1
1.1. FUNCTIONAL DESCRIPTION ........................................................................................................... 2
2. INSTALLATION ................................................................................................................... 4
2.1. VIDEO IN AND OUT........................................................................................................................... 5
3. SPECIFICATIONS ...............................................................................................................6
3.1. SERIAL VIDEO INPUT....................................................................................................................... 6
3.2. ANALOG VIDEO OUTPUT ................................................................................................................ 6
3.3. REFERENCE VIDEO INPUT.............................................................................................................. 6
3.4. VIDEO PERFORMANCE.................................................................................................................... 6
3.5. ANALOG AUDIO OUTPUTS (-A4 ONLY) ........................................................................................... 7
3.6. AES AUDIO INPUTS (-AES ONLY) AND OUTPUTS..........................................................................7
3.7. ELECTRICAL ..................................................................................................................................... 7
3.8. PHYSICAL.......................................................................................................................................... 7
4. STATUS LEDS..................................................................................................................... 8
4.1. MODULE STATUS LEDS .................................................................................................................. 8
4.2. AUDIO STATUS LEDS ...................................................................................................................... 8
5. AUDIO BUFFER MANAGEMENT (+S OPTION ONLY) .................................................... 10
6. AUDIO LEVELS, HEADROOM, CLIPPING AND THE BAR GRAPHS ............................. 10
7. AUDIO ALARM CALIBRATION PROCEDURE (-A4 AND –AES) .................................... 11
7.1. CALIBRATE AUDIO SILENCE DETECTION .................................................................................. 11
7.2. CALIBRATE AUDIO PHASE REVERSAL DETECTION ................................................................. 12
7.3. CALIBRATE AUDIO MONO DETECTION....................................................................................... 12
7.4. DEFINE THE FAULT CONDITION(S)..............................................................................................12
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8. ON SCREEN MENUS.........................................................................................................13
8.1. NAGIVATING THE ON SCREEN MENU SYSTEM.......................................................................... 13
8.2. CHANGING TEXT FIELDS ..............................................................................................................13
8.3. ON SCREEN DISPLAY – MAIN MENU ........................................................................................... 14
8.4. CONFIGURING THE AUDIO CONTROLS....................................................................................... 14
8.4.1. Selecting the Audio Source...................................................................................................15
8.4.2. Audio Freeze Mode (-A4 and –AES only) ............................................................................. 16
8.4.3. Additional Audio Delay (-A4 and –AES only) ........................................................................16
8.4.4. Monitoring the audio buffer tracking (-A4 and –AES only) .................................................... 17
8.4.5. Audio Channels Processing (-A4 and –AES only) ................................................................17
8.4.6. Setting the Analog Levels (-A4 only).....................................................................................17
8.4.7. Audio Gain Control (-AES only) ............................................................................................18
8.5. CONFIGURING THE VIDEO CONTROLS ....................................................................................... 18
8.5.1. Setting the Video Standard ...................................................................................................20
8.5.2. Setting the 525 Format..........................................................................................................20
8.5.3. Setting the 625 Format..........................................................................................................20
8.5.4. Selects the Action to Take when Input Video Is Missing.......................................................20
8.5.5. Genlock Source Selection.....................................................................................................21
8.5.6. Setting the Free-Running Frequency....................................................................................21
8.5.7. Setting the Fine Phase of the Output Video – NTSC/525 Video...........................................22
8.5.8. Setting the Fine Phase of the Output Video – PAL-B/625 Video ..........................................22
8.5.9. Setting the Horizontal Phase of the Output Video – NTSC/525 Video.................................. 22
8.5.10. Setting the Horizontal Phase of the Output Video – PAL-B/625 Video .................................22
8.5.11. Monitoring the Horizontal Delay between the Input and Output Video .................................22
8.5.12. Setting the Vertical Phase of the Output Video – NTSC/525 Video......................................23
8.5.13. Setting the Vertical Phase of the Output Video – PAL-B/625 Video ..................................... 23
8.5.14. Monitoring the Vertical Delay between the Input and Output Video......................................23
8.5.15. Monitoring the audio buffer tracking......................................................................................23
8.5.16. Setting the VITC Line Number – 525 Line Video .................................................................. 24
8.5.17. Setting the VITC Line Number – 625 Line Video .................................................................. 24
8.5.18. Setting the PESA Source ID Line Number – 525 Line Video................................................ 24
8.5.19. Setting the PESA Source ID Line Number – 625 Line Video................................................ 24
8.5.20. Setting the Default SID Mode................................................................................................24
8.5.21. Setting the Message to be Displayed When There Is No Incoming SID............................... 24
8.6. CONFIGURING THE OUTPUT VIDEO PROCESSING CONTROLS ..............................................25
8.6.1. Colour Bars ...........................................................................................................................25
8.6.2. Video Level ...........................................................................................................................26
8.6.3. Black Level Control ...............................................................................................................26
8.6.4. Y Video Level Control ...........................................................................................................26
8.6.5. Cb Video Level Control .........................................................................................................26
8.6.6. Cr Video Level Control ..........................................................................................................27
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8.6.7. Setting the PbPr Offset ......................................................................................................... 27
8.6.8. GBR Sync on Video .............................................................................................................. 27
8.6.9. H Blanking............................................................................................................................. 27
8.6.10. VBI Processing...................................................................................................................... 27
8.6.11. Y Filter Selection...................................................................................................................28
8.6.12. Wideband Y Frequency Response ....................................................................................... 28
8.6.13. Chroma Filter Selection......................................................................................................... 28
8.7. CONFIGURING THE BAR GRAPH CONTROLS (-A4) ................................................................... 28
8.7.1. Selecting the Bar Graph Operating Mode............................................................................. 29
8.7.2. Setting the Headroom ........................................................................................................... 30
8.7.3. Setting the Bar Graph Type .................................................................................................. 30
8.7.4. Setting the PPM Mode and Ballistics .................................................................................... 31
8.7.5. Setting the VU Display Range............................................................................................... 32
8.7.6. Setting The Phase Bar Graph Type...................................................................................... 32
8.7.7. Setting the Bar Graph Error Region......................................................................................32
8.7.8. Setting the Bar Graph Warning Region................................................................................. 33
8.7.9. Setting the Level Bar Graph Scale Position.......................................................................... 33
8.7.10. Setting The Phase Bar Graph Scale Position .......................................................................33
8.7.11. Setting The Window And Bar Graph Positions ..................................................................... 33
8.7.12. Setting the Colours of the Bar Graphs ..................................................................................34
8.7.12.1. Setting the Level Bar Graph Region Colour ........................................................34
8.7.12.1.1. Selecting a Bar Graph Region Custom Colour........................................... 34
8.7.13. Setting The Level Bar Graph Size......................................................................................... 35
8.7.14. Setting the Transparency (Opacity) of Bar Graph Background............................................. 35
8.7.15. Setting the Transparency (Opacity) of the Bar Graph Bars ..................................................35
8.8. CONFIGURING THE ON-SCREEN DISPLAY CONTROLS ............................................................ 35
8.8.1. Descriptions of the On Screen Windows...............................................................................36
8.8.1.1. Video/Audio Status.............................................................................................. 36
8.8.1.2. Time Code Window ............................................................................................. 36
8.8.1.3. Fault Message Windows ..................................................................................... 37
8.8.2. Setting the Position of On Screen Windows ......................................................................... 37
8.8.2.1. Setting the Horizontal Position of On Screen Windows ...................................... 37
8.8.2.2. Setting the Vertical Position of On Screen Windows........................................... 37
8.8.3. Setting the Position of the Bar Graphs.................................................................................. 37
8.8.3.1. Setting the Horizontal Position of the Bar Graphs............................................... 38
8.8.4. Setting the Vertical Position of the Bar Graphs..................................................................... 38
8.8.5. Selecting What Bar Graphs And Windows To Display.......................................................... 38
8.8.6. Setting the Text Window Attributes.......................................................................................38
8.8.6.1. Turning on the Text Window Backgrounds ......................................................... 39
8.8.6.2. Setting the Text Window Background Colours.................................................... 39
8.8.6.3. Setting the Text Window Background Opacity .................................................... 39
8.8.6.4. Setting the Text Window Text Opacity ................................................................ 39
8.8.6.5. Setting the Time Code Window Font Size...........................................................40
8.8.6.6. Setting the Status Window Mode ........................................................................ 40
8.8.7. Setting the Fault Window Attributes......................................................................................40
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8.8.7.1. Turning on the Fault Window Backgrounds.........................................................40
8.8.7.2. Setting the Fault Window Background Colours ................................................... 41
8.8.7.3. Setting the Fault Window Background Opacity ................................................... 41
8.8.7.4. Setting the Fault Window Text Opacity ............................................................... 41
8.8.7.5. Setting the Fault Window Font Size .................................................................... 41
8.8.7.6. Setting the Blink Mode of the Fault Windows ...................................................... 42
8.9. GPO CONFIGURATION...................................................................................................................42
8.9.1. Frame Status Fault Trigger Condition ................................................................................... 42
8.10. FAULT DEFINITIONS ............................................................................................................................42
8.10.1. Setting Up How A Fault Is Triggered And How It Is Presented............................................. 43
8.10.1.1. Fault Status .........................................................................................................43
8.10.1.2. Setting the position of the Fault Windows ........................................................... 43
8.10.1.3. Setting the Message Associated with a Fault......................................................44
8.10.1.4. Determining If The Fault Message Will Be Displayed .........................................44
8.10.1.5. Setting the Duration of the Fault Condition..........................................................44
8.10.1.6. Determining What Items Will Generate The Fault Condition...............................44
8.10.2. Setting the Fault Window Attributes ......................................................................................45
8.10.3. Setting the Loss of Video Duration........................................................................................46
8.10.4. Setting the Loss of Audio Duration........................................................................................46
8.10.5. Detecting Audio Over Level Faults........................................................................................46
8.10.5.1. Setting the Audio Over Level...............................................................................46
8.10.5.2. Setting the Audio Over Duration..........................................................................46
8.10.6. Detecting Audio Silence Faults .............................................................................................46
8.10.6.1. Setting the Audio Silence Level...........................................................................47
8.10.6.2. Setting the Audio Silence Duration......................................................................47
8.10.7. Detecting Audio Phase Reversal Faults................................................................................ 47
8.10.7.1. Setting the Audio Phase Reversal Level ............................................................. 47
8.10.7.2. Setting the Audio Phase Reversal Duration ........................................................ 48
8.10.8. Detecting Audio Mono Faults ................................................................................................48
8.10.8.1. Setting the Audio Mono Threshold Level............................................................. 48
8.10.8.2. Setting the Audio Mono Duration......................................................................... 48
8.10.9. Detecting Loss of Primary Captioning...................................................................................49
8.10.10.Detecting Loss of Program Rating Duration ........................................................................49
8.10.11.Detecting Picture Freeze .....................................................................................................49
8.10.11.1. Setting the Picture Noise Level ........................................................................... 49
8.10.11.2. Setting the Picture Freeze Duration .................................................................... 50
8.10.11.3. Optimizing the Picture Noise Level and Picture Freeze Duration Parameters ....50
8.10.12.Detecting Picture Black Duration.........................................................................................51
8.11. UTILITIES .........................................................................................................................................52
8.11.1. Accessing Information About this Module and its Firmware .................................................52
8.11.2. Saving And Recalling Configurations....................................................................................52
8.11.2.1. Storing Configurations to the User Presets ......................................................... 52
8.11.2.2. Recall Configurations from the User Presets ...................................................... 52
8.11.3. Initiating a Software Upgrade................................................................................................53
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8.11.4. Restoring the card to its Factory Default Configuration ........................................................ 53
8.12. CLEAR FAULTS AND PEAKS ........................................................................................................ 53
9. JUMPERS .......................................................................................................................... 54
9.1. TERMINATION JUMPERS............................................................................................................... 54
9.2. SELECTING WHETHER LOCAL FAULTS WILL BE MONITORED
BY THE GLOBAL FRAME STATUS ...............................................................................................54
9.3. CONFIGURING THE MODULE FOR FIRMWARE UPGRADES ..................................................... 55
9.4. SETTING THE COARSE ANALOG AUDIO INPUT GAIN RANGE ................................................. 55
Figures
Figure 1: 7730DAC Block Diagram ..................................................................................................................... 3
Figure 2: 7730DAC-A4 Block Diagram ............................................................................................................... 3
Figure 3: 7730DAC-AES Block Diagram............................................................................................................. 4
Figure 4: 7730DAC Rear Panels......................................................................................................................... 5
Figure 5 : Location of Jumpers on 7730DAC Main Board (7736CE) ................................................................ 54
Figure 6 : Location of Jumpers on 7735AI Submodule..................................................................................... 54
Tables
Table 1: Audio Channel Status LEDs.................................................................................................................. 9
Table 2: PPM Bar Graph Characteristics .......................................................................................................... 31
Table 3: Video/Audio Status Screen Items........................................................................................................ 36
Table 4: Methods of turning Windows and Bar graphs On and Off .................................................................. 38
Table 5: Possible Error Conditions to Produce a Fault ..................................................................................... 45
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REVISION HISTORY
REVISION DESCRIPTION DATE
0.0 start Oct 03
1.0 First release Jan 04
1.1 Added missing menu items Mar 04
WARNING: This version contains areas of gray text that are indicative of future
software releases. These sections are to be used as information only
and are subject to change. Some of these features may seem to work
but they have not been completed and have not been verified by
Evertz.
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1. OVERVIEW
The 7730DAC line of serial digital video to component analog converters are broadcast quality D to A’s
with an extensive list of additional features. High quality digital to analog conversion of audio or AES
inputs/outputs can be packaged with the video to create a D to A frame synchronizer with audio demux. In
addition, Evertz fault monitoring processing will analyze and report video and audio problems via an On-
Screen-Display, or remotely via VistaLINKSNMP.
The Features of the D to A process:
• 12 bit, over sampled video DACs.
• SMPTE/EBU N10, Betacam, MII and NTSC related standards supported.
• Y, Pb, Pr or G, B, R output format.
• Selectable setup pedestal.
• Black level and gain controls of all three components.
• 300mV separate composite sync output.
The Features of all 7730DAC’s are:
• SDI 525 or 625, 270 Mb/s component digital video input.
• One 270 Mb/s re-clocked SDI output.
• Four output BNCs for Y, Pb, Pr or G, B, R and composite sync.
• One composite analog output on BNC for monitoring and control.
• One frame video synchronizer (with +S option).
• Infinitely variable output phase (27MHz clock increments).
• Freeze modes: black, freeze, pass
• Menu adjustable free running frequency.
• VU/PPM bargraph level Indicators.
• Decodes vertical interval time code (VITC), outputs longitudinal time code (LTC) and “burns” the time
code into the monitoring output picture.
• A comprehensive on screen display is available to configure the various features of the module.
• Flexible configuration of the text and audio bar graph information displays.
• An extensive list of error conditions can be monitored and fault conditions can be configured from
these conditions.
• On screen messages can be triggered by the configured fault conditions.
The Features of "-A4" option are:
• One group (4 channels) of synchronous 20-bit audio is de-multiplexed from the incoming digital video.
• 2 unbalanced AES audio inputs (up to 48kHz, 24 bits) on BNC.
• User selects EITHER the de-embedded audio or the input AES audio.
• The selected audio is delayed equivalently to the video delay with the +S option.
• 4 high quality 24 bit audio channels are output (analog) as balanced on 2 removable barrier strips.
• Low impedance outputs (66Ω).
• Analog audio output levels are adjustable.
• Additional audio delay of up to 5 seconds.
• Additional audio advance of up to 1 frame, depending on video delay.
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• Loss of video modes: pass audio, mute audio.
The Features of "-AES" option are:
• 75-Ohm coaxial (unbalanced) AES inputs (2) on BNC.
• Audio delay equivalent to video delay (with +S option).
• Additional audio delay of up to 5 seconds.
• Audio advance of up to 1 frame less 3 microseconds.
• One group (2 channels of audio) is multiplexed on the outgoing digital video.
• 2 unbalanced AES audio outputs delayed equivalently to the embedded audio.
• 75-Ohm coaxial (unbalanced) DARS reference input on BNC.
• Loss of video modes: pass audio, mute audio.
• Bypass relay protection that allows removing the card without re-wiring AES audio.
1.1. FUNCTIONAL DESCRIPTION
The 7730DAC is a complete standard definition component D to A system with frame synchronizing (+S
version only), audio demulitplexing, audio delay and audio D to A. The embedded audio is extracted from
the input video before the video and audio are synchronized to a reference source. The component serial
digital video is then converted to 10 bit over-sampled component (Y, Pb, Pr or G, B R) analog video. Gain,
black level, color space conversion and setup pedestal addition are functions that are performed during
the digital processing.
In the 7730DAC-A4 version, the embedded audio is converted from digital PCM audio to balanced analog.
The 7730DAC-AES, alternatively receives input AES audio and rate converts it to synchronous 48kHz.
The digital audio is then delayed to match the delay experienced by the video in the video synchronizer
(with +S option). This delayed audio (with +S option) is formatted properly and delivered to the user as
unbalanced 75 Ohm AES audio on BNC and balanced analog audio.
The audio is also processed to extract level and phase information. The CPU creates the level and phase
bar graphs and writes them out to the on screen display (OSD) memory.
The hardware mixes (keys) the on screen text and bar graphs display information onto the video stream.
This video goes out through a composite encoder with the OSD "burn-ins".
The CPU also gets pushbutton and toggle switch commands from the card edge controls and draws
extensive menus for configuring the operation of the card.
The following block diagrams illustrate the processing blocks.
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S/P EDH
Analysis
SDI Input
VBI Decoders
and Freeze/
Black detector
Genlock
75 Ω
Card
Reference
CPU
Card Edge
Controls &
Indicators
To/From
SNMP
Network
Composite
Analog
Reference
OSD
Display
Frame
Sync
(optional)
Y/G
Pr/R
Pb/B
Composite
Sync
Sync
Generation
DAC
Colour
Space
Converter
Low
Pass
Filters
Composite
Encoder
SDI Loop
Out
Mon Output
7730DAC(+S)
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Figure 1: 7730DAC Block Diagram
S/P
2 AES
Inputs
EDH
Analysis
SDI Input
VBI Decoders
and Freeze/
Black detector
Genlock
75 Ω
Card
Reference
CPU
Card Edge
Controls &
Indicators
To/From
SNMP
Network
Composite
Analog
Reference
OSD
Display
Audio content
analysis and
Delay (optional)
Audio
Demux
Frame
Sync
(optional)
AES
Receivers
D/A
4 Channels
Balanced
Analog
Audio
Y/G
Pr/R
Pb/B
Composite
Sync
Sync
Generation
DAC
Colour
Space
Converter
Low
Pass
Filters
Composite
Encoder
SDI Loop
Out
Mon Output
7730DAC-A4(+S)
Figure 2: 7730DAC-A4 Block Diagram

7700 MultiFrame Manual
7730DAC Component D to A
S/P EDH
Analysis
SDI Input
VBI Decoders
and Freeze/
Black detector
Genlock
75 Ω
Card
Reference
CPU
Card Edge
Controls &
Indicators
To/From
SNMP
Network
Composite
Analog
Reference
OSD
Display
Frame
Sync
(optional)
Y/G
Pr/R
Pb/B
Composite
Sync
Sync
Generation
DAC
Colour
Space
Converter
Low
Pass
Filters
Composite
Encoder
SDI Loop
Out
Mon Output
7730DAC-AES(+S)
2 AES
Inputs
Audio content
analysis and
Delay
75 Ω
AES
Formatter
Sample Rate
Converters
2 AES
Outputs
DARS
Reference
Audio
Demux
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Figure 3: 7730DAC-AES Block Diagram
2. Installation
The 7730DAC modules come with a companion rear plate and occupy one or two slots in the 7700FR(-G)
frame. Figure 4 shows a picture of each of the rear panels. For information on mounting the rear plate
and inserting the module into the frame see the 7700FR chapter section 3.
The 7730DAC cards must be inserted into slots with the correct rear panel. Some cards have physical
differences and some have functional differences.

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7730DAC Component D to A
Figure 4: 7730DAC Rear Panels
2.1. VIDEO IN AND OUT
Connect a source of SDI component digital video to the top BNC labeled SDI IN. If needed, you can
cascade the input SDI signal to other gear with the re-clocked output labeled SDI OUT. Connect the
component analog output (Y/G, Pb/B, and Pr/R) to the destination equipment with three equal length coax
cables. Separate composite sync is available on the SYNC output if needed. Connect a reference black
signal to the REF IN BNC (+S option only). Alternatively, if you have a 7700FR-G frame, this card can be
configured to accept one of the reference signals provided to the frame. Composite analog video with text
and audio bar graphs are available on the MON OUT output BNC. If the card is not present or the power is
off, there will be nothing on any of the outputs. Optionally, LTC is available on the REF IN/LTC OUT BNC
which has been converted from the incoming VITC.
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3. SPECIFICATIONS
3.1. SERIAL VIDEO INPUT
Standard: SMPTE 259M-C – 525 or 625 line component.
Number of Inputs: 1
Number of re-clocked
outputs:
1
Connector: BNC per IEC 169-8
Return Loss: >15dB to 270MHz
Embedded Audio: SMPTE 272M-A
Frequency Lock
Range:
±75ppm from nominal
3.2. ANALOG VIDEO OUTPUT
Standards: SMPTE/EBU N10, Betacam, MII and NTSC specific standards
GBR or YPbPr formats with or without setup
Number of outputs: 1
Connectors: 4 BNCs per IEC 169-8
Video signal Level: 1V nominal
Sync signal Level: 300mV nominal
Output level control range: ±10%
Black level control range: ±10 IRE
Input Impedance: 75 Ohm
Return loss: >45dB to 10MHz
3.3. REFERENCE VIDEO INPUT
Standard: NTSC, SMPTE 170M
PAL, ITU624-4
Number of Inputs: 1
Connector: BNC per IEC 169-8
Signal Level: 1V nominal
Frequency Lock Range: ±75ppm from nominal
Input Impedance: 75 Ohm or High impedance (jumper selectable)
Return Loss: >25dB to 10MHz
3.4. VIDEO PERFORMANCE
Frequency Response: <±0.1dB (100kHz to 4.1MHz)
Noise Floor: < -73dBrms (15kHz to 5MHz)
Inter-channel Delay: <±5ns
Minimum Delay: 3 µsec
Maximum Delay: 1 frame plus 3 µsec
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3.5. ANALOG AUDIO OUTPUTS (-A4 only)
Number of
Outputs:
4
Type: Balanced analog audio
Connector: Two 6 pin removable terminal strips
Output
Impedance:
66Ωbalanced
Sampling
Frequency:
48kHz
Signal Level: 0dBFS => 12 to 25dBu (user settable)
Frequency
Response:
<+/- 0.05dB (20Hz to 20kHz)
Dynamic range: 24 bits when AES inputs selected,
20 bits when embedded audio selected
THD+N: <0.001% (>100dB) @ 1kHz, -1dBFS
Crosstalk: <-105dB (20Hz to 20kHz)
DC Offset: <+/- 30mV
SNR: >110dB "A" Weighting
Inter-Channel
Phase Error:
<+/-1°(20Hz to 20kHz)
3.6. AES AUDIO INPUTS (-AES only) AND OUTPUTS
Number of Inputs: none on –A4 versions, 2 on –AES versions
Number of Outputs: 2
Input Standard: SMPTE 276M, single ended synchronous or asynchronous PCM AES
Output Standard: SMPTE 276M, single ended synchronous AES
Connectors: BNC per IEC 169-8
Resolution: 24 bits
Sampling Rate: 32kHz to 48 kHz on inputs, synchronous 48kHz on outputs
User Bits: Transferred to output in a non-real-time, non-block-contiguous manner
Minimum I/O Delay: 2.1msec on –A4 versions
2.5msec on –AES versions
Maximum I/O Delay: 5 seconds
3.7. ELECTRICAL
Voltage: + 12VDC
Power: 10 Watts DAC + 7.5 Watts (-A4 option) = 17.5 Watts total
EMI/RFI: Complies with FCC Part 15, class A and EU EMC directive
3.8. PHYSICAL
7700 frame mounting:
Number of slots: 1 for non-audio versions
2 for audio versions (-AES, -A4)
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Stand Alone Enclosure:
Dimensions: 14 “ L x 4.5 “ W x 1.9 “ H
(355 mm L x 114 mm W x 48 mm H)
Weight: approx. 1.5 lbs. (0.7 Kg)
4. STATUS LEDs
Front card edge drawing goes here.
4.1. MODULE STATUS LEDS
MODULE STATUS: This Green LED will be on when the module is operating properly.
LOCAL FAULT: This Red LED makes it easy to identify one module in a frame that is missing an
essential input or has another fault.
The LED will blink on and off if the microprocessor is not running.
The LED will be on when there is a fault in the module power supply or a user
configurable error condition exists.
NTSC/PAL: The NTSC/PAL Green LEDs (NTSC on the top, away from the PCB and PAL on
the bottom, closest to the PCB) will indicate the video standard of the SDI video
input. If video is removed, both LEDs will go off. If the input standard is opposite
to the user selected standard, the LED will flash.
GENLOCKED: This Green LED is on solid if the genlock source is present and the user has
turned on genlocking.
It is flashing if the user has turned on genlocking and the genlock source is not
present.
It will be off if the user has turned genlocking off.
AUDIO:
This Green LED is on solid when the user selected audio is present. It will flash
when some, but not all, of the audio channels are present. If no audio is present,
it will be off.
For instance, if external AES audio is selected (via. the OSD menu) and only one
of the two AES channels is present, then this LED will flash.
4.2. AUDIO STATUS LEDS
Four LEDs located on the lower end of the module (near the card extractor) indicate which audio channels
are present. Audio channel 1 LED is located closest to the center of the module. Digital audio presence is
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determined by the AES receiver lock indicator (when AES input is selected). When embedded audio is
selected, the channel must be present on the selected group for the LED to illuminate.
Audio
LED
Colour Audio Channel Status
1 Off No channel 1 present.
Green Channel 1 present.
2 Off No channel 2 present.
Green Channel 2 present.
3 Off No channel 3 present.
Green Channel 3 present.
4 Off No channel 4 present.
Green Channel 4 present.
Table 1: Audio Channel Status LEDs
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5. AUDIO BUFFER MANAGEMENT (+S OPTION ONLY)
The audio is delayed, through a large memory buffer, by the same time value as experienced by the video
through the video frame synchronizer. This is done to maintain a consistent video/audio relationship.
Unfortunately, when the video frame buffer drops or repeats frames of video, we cannot do the same with
the audio. The rate of the ingoing audio data is changed and over a period of time, the buffer is returned to
a value that matches the video. A sample rate converter is used to change the rate of the incoming AES
on the -AES version while the 48kHz sampling clock is changed slightly from it's nominal value on the
analog audio input (-A4) version. This method is also used when video is first applied or there is a sudden
change in either the input video phase or genlock video phase.
When the audio buffer delay needs to be changed, there are two rates used; +/- 1% and +/- 30ppm.
Initially, a 1% rate change is used to quickly match the audio delay to the video delay. This correction will
only take a couple of seconds but will produce a pitch change. The pitch change will be discernable,
particularly on sustained musical notes. When the video/audio delays are close to each other and only
small corrections are required, the audio buffer will be adjusted with a rate change of 30ppm (30 Parts-
Per-Million is equivalent to 0.003%). This rate change will produce a pitch change that is near the
threshold of where a human can detect it and should not be discernable with normal content.
Unfortunately, the audio buffer management relies on a sample rate converter (-AES versions only) to
adjust the audio buffer size. This precludes the synchronization of non-PCM AES data (i.e. Dolby-E). In
the future, a non-sample rate converter mode may be available.
Audio A to D converters and sample rate converters have inherent delays that are much longer than what
the minimum acceptable video I/O delay is. To allow the user to operate the video synchronizer with small
video delays, we will hold the audio buffer delay at it's minimum value when the video is less than this
minimum.
6. AUDIO LEVELS, HEADROOM, CLIPPING AND THE BAR GRAPHS
This section contains notes to understand how the 7730DAC-A4 relates analog audio levels, digital audio
levels, and the displayed bar graph levels.
Before you can calibrate the audio digital to analog converter, you must know a couple of system issues
specific to your application. What is your analog reference level and how much headroom is there in the
digital audio signal? By adding these two values together, you will get the analog output level that will just
begin to saturate the digital word (This is the highest level that can be represented without distortion with
the digital numbers). This level is called 0dB FS (FS stands for "full scale"). For instance, if your analog
program reference level is 4dBu and you have 20dB of headroom in the "digital world", then 0dB FS will
correspond to an analog level of 24dBu. Once the audio output level is calibrated, when you apply a digital
level of –20dB FS, the analog output signal will be 4dBu .
The SDI embedded audio, the AES input audio and the bargraphs are all based on the same digital
quantized signal level. The AES/EBU bargraph ballistics mode is scaled to 0dB FS while the other modes
have a user selectable headroom. For this reason, use the AES/EBU mode for calibrating audio levels.
When a full-scale digital signal is input, you will get a peak analog output signal level that is set by the
analog level controls. The Headroom control sets the 100% program reference level (0 dB on the scale)
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with respect to the Peak Output Level set by the analog level controls. For example, if the Peak Output
Level is set to 24 dBu and the Headroom is set to 20 dB, then the 0 dB reference on the bar graphs will
correspond to an output level of 4 dBu. This level will be achieved when a digital input signal of –20 dB FS
is applied at the input. Therefore, the following relationship is always maintained:
PGM reference level + headroom = peak output level
NOTE: The VU and PPM standards were set before the digital revolution. These standards deal with
headroom levels that are quite a bit lower what should be used in the digital world. Also, most of the
bar graphs only display a few dB above the program reference level. In a digital world, one needs to leave
around 20 dB of headroom to keep most material away from clipping.
For best results, follow these steps when setting up the audio bar graphs and output levels:
1. Set the Headroom control to the desired value. Remember that this is the value in dB between the
100% reference level (expressed in dB FS) and saturation level of the digital input word (0 dB FS). It
will also correspond to the value in dB between the analog output level when a reference level is input
and the maximum output level set by the analog level controls.
2. Pick the bar graph type and mode. This selection will configure the bar graphs with the defaults
dictated by the standards. It will also set the Peak Output Level and the 0dB reference level to adhere
to the standard and the desired headroom.
3. Adjust any of the bar graph configuration parameters to customize the display of the graphs.
4. Save the card configuration into a preset so that you can recall it if any card parameter is tampered
with.
7. AUDIO ALARM CALIBRATION PROCEDURE (-A4 and –AES)
This section contains detailed description on setting the various audio warning/error detection parameters.
Some of the audio alarm detection algorithms are dependent on the state of other audio alarm detectors.
For instance, the mono detection algorithm will not use periods of silence as determined by the silence
detection. For this reason, the following sequence should be used to calibrate the audio alarms. The
items in italics refer to menu items in the OSD. See section 8.10 for a complete description of the fault
definition menu items.
7.1. CALIBRATE AUDIO SILENCE DETECTION
1. Supply the card with your plant's noisiest audio feed without any audio program material present. This
will be a baseline noise level to calibrate the silence detector.
2. Turn off all sources of errors in a Fault Condition and assign Audio Silence as the only error. Also,
make sure that you set the Fault Duration to a small number of frames so that you will see when the
error condition disappears.
3. Set the Silence Duration to 0.5 sec so that you can see the results of adjusting the Silence Level
parameter without getting confused with the detection time.
4. Adjust the audio Silence Level until the Fault Condition begins to go active. This will be the noise floor
level. Raise the Silence Level a few dB to make the detector insensitive to this noise level.
5. Set the Silence Duration to a time appropriate to your application. This should be set to a value longer
than your worst case acceptable quiet period.
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7.2. CALIBRATE AUDIO PHASE REVERSAL DETECTION
1. Supply the card with a stereo signal that has the phases reversed. Make sure that the material is
typical of normal content for this channel.
2. Turn off all sources of errors in a Fault Condition and assign Phase Reversal as the only error. Also,
make sure that you set the Fault Duration to a small number of frames so that you will see when the
error condition disappears.
3. Set the Phase Reversal Duration to 0.5 sec so that you can see the results of adjusting the Phase
Reversal Level without getting confused with the detection time.
4. Adjust the Phase Reversal Level so that the Fault Condition detects the phase reversal.
5. Set the Phase Reversal Duration to a time period appropriate to your application.
Warning: Periods of silence (below the Silence Level) will extend this duration. In other words, periods
without audio content are not included in the phase reversal detection.
Warning: Stereo material with long periods of dissimilar left/right content (i.e. music with plenty of
panning) may cause the phase reversal detector to fire. It is best to set the Phase Reversal Duration to
a value larger than what you would expect.
7.3. CALIBRATE AUDIO MONO DETECTION
1. Supply the card with a stereo signal that originated from mono material and that has a large amount of
un-correlated noise added to each channel. This will allow you to set the Mono Threshold to a value
that will detect the mono condition in the presence of noise.
Warning: Make sure that the material is in-phase. Mono material will not be detected if it is out of
phase.
2. Turn off all sources of errors in a Fault Condition and assign Mono as the only error. Also, make sure
that you set the Fault Duration to a small number of frames so that you will see when the error
condition disappears.
3. Set the Mono Duration to 0.5 sec so that you can see the results of adjusting the Mono Threshold
Level without getting confused with the detection time.
4. Adjust the Mono Threshold Level so that the Fault Condition detects the mono material in the
presence of noise.
5. Set the Mono Duration to a time period appropriate to your application.
Warning: Periods of silence (below the Silence Level) will extend this duration. In other words, periods
without audio content are not included in the mono detection.
Warning: Stereo material with long periods of similar left/right content (i.e. talking heads in a news
cast) may cause the mono detector to fire. It is best to set the Mono Duration to a value larger than
what you would expect.
7.4. DEFINE THE FAULT CONDITION(S)
1. A Fault Condition is defined as a group of one or more problems grouped together that will create a
fault when any one of the problems exist. Decide what grouping of error conditions will generate a fault
by setting the appropriate condition to Yes in the Fault Condition menu.
2. Set the Fault Duration to either Until Reset or to a time value. This is how long the condition will stay
active after the conditions generating the fault go away.
3. Configure a Fault Message. Enter the text to display on screen, it's H and V position, and it's
characteristics (opacity, colour, etc).
4. Assign the Fault Condition to an output contact closure (GPO) if it is desired.
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8. ON SCREEN MENUS
8.1. NAGIVATING THE ON SCREEN MENU SYSTEM
A toggle switch and pushbutton allow card edge navigation of a set of on-screen menus used to configure
the card.
To enter the on-screen menu system, press the pushbutton once. This will bring you to the main setup
menu where you can use the toggle switch to move up and down the list of available sub menus. An arrow
(>) moves up and down the left hand side of the menu items to indicate which item you are currently
choosing. Once the arrow is on the desired item, press the pushbutton to select the next menu level.
On all menus, there are two extra selectable items: Back and Exit. Selecting Back will take you to the
previous menu (the one that was used to get into the current menu) while Exit will return the display to its
normal operating mode. On the main menu, BACK and EXIT will both take you to the normal operating
mode.
Once in a sub menu, there may be another menu layer, or there may be a list of parameters to adjust. If
there is another set of menu choices, use the toggle switch to select the desired menu item and press the
pushbutton.
To adjust any parameter, use the toggle switch to move up or down to the desired parameter and press
the pushbutton. The arrow will move to the right hand side of the line (<) indicating that you can now
adjust the parameter. Using the toggle switch, adjust the parameter to its desired value. If the parameter
is a numerical value, the number will increase if you lift the toggle switch and decrease if you push down
on the toggle switch. If the parameter contains a list of choices, you can cycle through the list by pressing
the toggle switch in either direction.
When you have stopped at the desired value, depress the pushbutton. This will update the parameter to
the selected value and move the arrow back to the left side of the parameter list (>). Continue selecting
and adjusting other parameters or use the BACK or EXIT commands.
8.2. CHANGING TEXT FIELDS
Some of the controls of the OSD menu allow you to adjust a text-based field. Editing a line of text can be a
little tedious with a toggle switch and a pushbutton, but it can be done with the following procedure:
1. Select the text to edit by pressing the pushbutton when the menu item is selected. This will take you
to a screen that has the label/name of the text being edited and a white box. The white box contains
the text to change and is drawn to the maximum size of the text field.
SAMPLE TEXT
^
Note the arrow (^) under the character. This indicates which character you will be changing with the
toggle switch.
2. Use the toggle switch to change the first character of the text message.
3. Once you have selected the desired character, press the pushbutton. This will advance the arrow to
the next character. Continue changing the remainder of the characters in the same way.
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4. There are two special characters to help you enter the text: a backspace character (left pointing
arrow), and an end of line character (stop sign):
Left Arrow: If you have accidentally advanced to the next character and want to go back, select the left
arrow with the toggle switch. When you press the pushbutton, you will go back to the previous
character. This will save you from having to complete the editing and re-edit it to change the mistake.
Stop sign: If you are done changing the text, and the new text is shorter than old text, you can terminate
the line with a stop sign. When you use the pushbutton after selecting the stop sign, any remaining
characters in the text field will be erased and you will return to the menu structure.
5. You are done editing when you reach the end of the field (maximum length), or you select the stop
sign and press the pushbutton.
8.3. ON SCREEN DISPLAY – MAIN MENU
Audio Configuration of the parameters associated with analog audio inputs and audio
multiplexing
Video Controls for the operation of video processing.
Bar graphs Configuration of the audio level and phase bar graphs.
On-screen display
configuration
Positioning controls and the on/off state of all windows and bar graphs.
Configuration of the text window colours and opacity levels.
Fault definitions Definition and calibration of the fault conditions.
Configuration of the fault message windows.
Utilities Card preset management, and various debug and maintenance features.
Clear faults and
peaks
An easy to access “clear fault state and bar graph peaks” command.
The OSD menu is arranged in a layered structure that groups similar configuration items together. The
following section gives a brief description of the first level of menus that appear when you enter the OSD
screens. Selecting one of these items will take you to the next menu level. Sections 8.4 to 8.12 provide
detailed descriptions of each of the sub menus. The tables in sections 8.4 to 8.12 are arranged in an
indented structure to indicate the path taken to reach the control. Menu items or parameters that are
underlined indicate the factory default values.
8.4. CONFIGURING THE AUDIO CONTROLS
The Audio menus are used to configure parameters associated with the analog audio outputs and the
audio de-multiplexing. The chart below shows the items available in the Audio menu. Sections 8.4.1 to
8.4.6 give detailed information about each of the parameters. Many of the menu items are the same for
the channel 1/2 and 3/4 channel pairs. For simplicity only the menu items for the channel 1/2 channel pair
are shown in the manual.
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