Crystal Vision Indigo DACA214 User manual

DACA214
Digital to analogue audio converter
Crystal Vision Ltd., Lion Technology Park, Station Road East, Whittlesford, Cambridge, CB22 4WL, England.
Tel: [phone] Fax: [phone] [e-mail] www.crystalvision.tv

Crystal Vision DACA214 User Manual
Contents
1Introduction 3
System overview 4
Control 4
2Statesman 5
Statesman operation 6
Using DACA214 controls 7
Selecting silence options 7
Selecting the sample rate mode 8
Channel swapping, single channel mode and phase inversion 8
Setting channel gain and input termination 8
Audio Monitoring 8
3Using the front control panel 9
The DACA214 menu structure 11
Setting channel gain and input termination 13
Audio Monitoring 13
Status menus 14
Switch menus 15
Control menus 15
4Using card edge controls 17
Selecting the sample rate mode 17
Channel swapping, single channel mode and phase inversion 18
Selecting silence warning options 18
Setting the silence threshold 19
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Audio Monitoring 19
Setting channel gain and input termination 19
5Installation 20
Rear module connections 21
Using GPIs 27
GPI input assignments 27
GPI output assignments (alarms) 27
GPI Connections 28
Hardware configuration 28
Setting channel gain 28
Setting input terminations 29
Wiring XLR breakout leads 30
6Problem solving 31
7Specification 33
Revision 9 RM35 connection information updated 08/01/08
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Crystal Vision
Introduction
Crystal Vision Introduction
1 Introduction
The DACA214 is a dual digital to analogue audio converter designed to
convert two AES/EBU audio signals to four channels of analogue audio.
Each digital input has its own phase locked loop, which can automatically lock
to the incoming signal sample rate. The range is from below 30kHz to above
50kHz. Inputs at 48kHz have the added benefit of a highly stable re-clocking
mode.
Control and status monitoring are available from Statesman, the card edge, the
frame front panel or from a remote control panel.
In addition to digital to analogue conversion, the DACA214 incorporates a
number of powerful features. For example, a channel swap function allows
channels 1 and 2 to be transposed, whilst the phase of the right hand channel
can be inverted to correct phasing errors. Analogue monitoring can be used to
listen to each stereo pair and audio quality is ensured with sophisticated error
masking.
Also ‘near silence’ detectors monitor the audio signal level in both channels in
case they fall below –50 dBFS for more than a selected period of time. Silence
warning and loss of input warning status are normally routed by default to the
GPI port for each channel.
The main features are as follows:
• 20/24 bit dual digital to analogue audio converter
• output level range of +12dBu to +28dBu for 0dBFS digital
• output level pre-sets for +18dBu and +24dBu
• accepts 110 Ohm balanced, 75 Ohm unbalanced and high impedance inputs
• choice of rear connectors to accommodate I/O format options
• wide ranging ‘Auto’ mode for sample rates between 30kHz and 50kHz
• precision, re-clocking ‘Xtal’ mode for 48kHz inputs
• channel swap and RH channel invert
• loss of AES input and sustained silence warning via indicators and external
alarms
• GPIs for ‘Xtal’ and ‘Auto’ mode change, channel swap and loss
of input/silence warning
• control and status monitoring via Statesman, board edge or
frame/remote control panel
• audio error masking
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Introduction
Crystal Vision Introduction
System overview
The converter is configured as two independent converter channels each with
their own error masking, validity checking and regeneration circuitry.
Intelligent audio routing provides for channel swapping, single channel mode
and phase inversion.
There are two operational modes, ‘Auto’ allows flexible Phase Locked Loop
sample rate control to accept a wide input frequency range, whilst the ‘Xtal’
mode is provided for crystal locked operation at 48kHz.
Control of the card is on a first come first served basis from the card edge,
Statesman, the frame control panel (if fitted) or a remote control panel.
Two stereo pairs are output for each channel from the 24 bit Digital to
Analogue converters and are buffered to provide duplicate outputs and
headphone monitoring.
There are also three different types of rear module to provide a wide range of
I/O options. Further details of the rear modules can be found in the installation
chapter.
Control
The control of the DACA214 will always follow the last control surface used.
For example, if a card edge lever is moved the unit will switch to and remain
in the ‘Local Control Mode’. If any control panel menu is used, then the unit
will switch to and remain in the ‘Remote Control Mode’. The settings made
will be remembered after a power down and the last control mode used will
be retained.
The auto-configuration process performed when a DACA214 is first powered
up, detects the current configuration settings and restores the appropriate
control.
Once this initialisation procedure is complete, the card can be controlled or
configured from Statesman, the card edge, the frame’s local control panel or
from a remote control panel.
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Crystal Vision
Introduction
Crystal Vision Statesman
2 Statesman
The Crystal Vision Statesman PC control software is designed to control a
range of Crystal Vision modules via serial control from a PC. The main
Statesman application communicates with each module in a frame through an
active control panel with or without a LCD display. Statesman will not be
able to detect modules used in a frame with only a passive front panel.
2.1 Installing Statesman
Minimum pre-requisites:
• A PC running Windows 98, NT4 with SP 5 or higher Windows
2000 or Windows XP
• A parallel port dongle supplied with the Statesman software package
• An RS422 serial connection from the host PC to the Remote 2
connector on an FR1AV or FR2AV Crystal Vision frame with at
least one DACA214 module and/or other Statesman compatible
module
• An active control panel MUST be fitted to the frame with
version 1.63 or above firmware – if it is an Indigo frame the
firmware must be V1.04 or above
• An optional RS422 to RS232 converter if the PC has no RS422 ports
Installing Statesman
• Refer to the readme and/or help file on the CD before proceeding
• To view all application windows, set graphics resolution to at least 1024 x 768
• Remove any previous version of the Statesman software using
the Add/Remove Programs application in the Windows Control
Panel
• Ensure that the Statesman dongle is fitted to the parallel port of the host PC
• Insert the Statesman CD and the installation should start immediately
– if it does not, run the setup.exe file on the CD
• Obey any installation program prompts and restart the PC when prompted
Running Statesman for the first time
The Statesman PC Control System may be run from the Crystal Vision
programs folder via the Start menu or by double-clicking on the Crystal
Vision.exe file in the installed program directory. When the program runs it
will require licence information and an administrator name and password. It
will also need to know which computer port is being used to connect to a
Crystal Vision frame(s).
Note: For further details of Statesman configuration please refer to the Statesman manual.
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Introduction
Crystal Vision Statesman
Statesman operation
Once Statesman is configured it should automatically detect any Statesman
compatible modules in the connected frame or frames and display them in
the main application left hand explorer-style window.
Open any frame by clicking on the ‘+’ sign or by double clicking on a
frame. Installed modules should be shown with module icons. Frame and
module icons can be named as desired by right-clicking or using the edit
menu and choosing rename.
To aid user recognition of module and frame status quickly, the following
colour and size coding is used:
• A module is shown present by full colour and absent by greyed colour
• A module is shown open by large icon size and closed by small icon
• A module is the source of an active alarm if red and not alarmed if green
Double-clicking on a module will enable the display of the main application
menus.
Statesman main application window
The two large control panes shown in the upper and lower halves of the window
may display different menus for the same card, or controls for different cards.
Click on the horizontal button-bar between the two panes to close the lower
plane or drag the button to vary the size of the panes.
Note: For further details of Statesman configuration and operation please refer
to the Statesman
manual.
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Introduction
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Using DACA214 controls
The configuration controls are as follows:
• Silence time – 1.5 to 120 seconds
• AES1/2 Mode – 48K or Auto
• Phase inversion
• Audio channel assignment
• Status – Input presence, input sample rate, silence detect, GPI state
Configuration
Selecting silence options
The digital audio processing circuits include ‘near silence’ detectors. If the
audio signal levels are sustained at below –50 dBFS for more than a
selected period of time, a LED indicator comes on.
Silence detect indicators show if the left or right channel of the stereo AES1
and/or AES 2 signals have been silent.
Silence warning and loss of input warning status are normally routed by default
to the GPI port for each channel. To prevent silence detection from raising
alarms via GPI lines please refer to the Using Card edge controls chapter.
To change the time required for a sustained silence to raise alarms and display
warnings click on the Silence Time drop down box and select from the
following range:
Threshold
1.5 seconds
8 seconds
Every 8 seconds until...
120 seconds
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Introduction
Crystal Vision Statesman
Selecting the sample rate mode
Each DACA214 AES input channel operates in two main modes 48K and
Auto. Make the selection with the mouse by placing a selection dot against
the required mode for each channel.
The primary mode is for the input sample rate clock to be locked to the
AES input using a 48kHz crystal oscillator to achieve optimum distortion
figures. This is referred to as ‘Xtal’ mode and should be used at all times if
possible.
The second mode uses built in phase locked loops and VCOs to accept an AES
input which may vary from below 30 kHz to above 50 kHz. This is referred to
as ‘Auto’ mode, and should be used when an AES input rate is outside 48
kHz +/- 50 PPM.
Channel swapping, single channel mode and phase inversion
Channel routing logic following the regeneration circuits allows the incoming
digital signals to be assigned to outputs in a variety of ways.
The possible variations are as follows:
• channels may be swapped so that AES 1 feeds Stereo Output 2 and AES
2 feeds Stereo Output 1
• both output stages may be assigned to either AES 1 or AES 2,
effectively doubling the duplicate outputs for a single digital input
• the phase of the right hand output of Stereo Output 1 OR Stereo Output
2 may be inverted Make the selection with the mouse by placing a
selection dot against the required options.
Note: When used as a single input converter, the unused AES input will be disabled
and therefore silent, even if an active AES feed is present. GPI connections to
the shuffling mode lines will override card edge switches if asserted to logic low
or grounded.
Setting channel gain and input termination
Please refer to the Hardware configuration section of the Installation chapter
for channel gain and input termination settings.
Audio Monitoring
Audio monitoring is provided at the card edge with two miniature stereo jack
socket. The left hand socket is connected to the Stereo 1 input signal and the
right hand socket is connected to the Stereo 2 input signal.
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Introduction
Crystal Vision Using the front control panel
3 Using the front control panel
This operational guide assumes that the panel has been setup according to
the Panel setup procedure described in the Crystal Vision Controls Panel
manual.
Note: It is ESSENTIAL that the Panel setup procedure is followed and any
old or unknown passwords cleared prior to using the panel for the first
time.
At power up, the two line 20-character screen will display ‘Crystal Vision’
followed by the firmware version number for the control panel. All eight
control panel key LEDs will illuminate.
The Crystal Vision control panel start up display
'Control Panel' then briefly replaces the version number display.
If the control panel firmware has been updated for Statesman control (version
1.5.0 or higher), Statesman Mode will be entered and the message, ‘Press
CAL to Exit’ will be displayed and the CAL LED will light.
Statesman mode is entered by default
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To continue with control panel operation or configuration, press the ‘CAL’
key once. A second press of the ‘CAL’ key will return to Statesman control.
The control panel will display the name of the card that first responds to the
polling request together with its location number.
The location number consists of the frame number plus the card position in the frame.
Selecting the DACA214
To select a particular card in a frame, press the DEVICE key to go to the
Device menu. The top line of the display will show ‘Available Cards X’,
where X is the number of cards that have responded so far to the polling
request.
The available cards menu
Rotate the shaft encoder and the bottom row will display the successfully polled
cards by name and location or slot number.
In the example above, the card displayed is located in the first frame in slot
number 1. When the desired card is selected press the ENTER key to access that
card’s HOME menu.
If remote control has been enabled, the control panel will then enter card mode
and communicate with the selected module at the node number last displayed
in the available cards list.
The DACA214 home menu
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Introduction
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Navigating the display
The functions assigned to control panel keys are dependent on the card
selected for control, and the panel mode. The following list illustrates the
functions when controlling the DACA214:
• DEVICE – enters Device menu to select a card or card to control /
enter Panel setup when held down during power up / shows frame
status when pressed from Statesman mode
• CAL – Enter or leave Statesman mode / enter panel diagnostics
mode when held down during power up / updates the display
• Asterisk – enters board rename menu from the Device menu
• F1 to F4 – soft keys, function assigned within each menu
• HOME – moves the display to the home menu
• ENTER – accept current selection
• Upward arrow – used to move up the menu structure / enter lock panel
menu from the Device menu
• Rotary control – shaft encoder used to select options or variable data
Note: Please refer to the Crystal Vision Control Panel manual for details of
the Panel Setup, Lock Panel and Diagnostic menus.
Updating the display
The values displayed on an active front panel are only updated when an
adjustment is made and when changing menu level. If mode changes occur
through the use of Statesman, card edge controls or through automatic
response to the input video signal, the text displayed on the active front panel
will not be updated immediately. If necessary, press CAL to update the
display.
The DACA214 menu structure
The main top-level menus are obtained by pressing the F1, F3 and F4 keys from
the HOME menu. Menu keys are illuminated when active and when further
menus are available. The three top-level menus are:
• STATS (Status) – press F1
• SWTCH (Switch) – press F3
• CNTRL (Control) – press F4
The following chart shows the available menus. The actual menus available
may vary slightly as DACA214 software is updated.
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Introduction
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The DACA214 menu tree
Note: Function keys and shaft encoder LEDs are illuminated when active.
The use of STATUS or SWITCH monitoring functions does not affect
whether the DACA214 is operating in ‘LOCAL CONTROL MODE’, or
‘REMOTE CONTROL MODE’.
The STATUS display data may differ from the actual settings due to
Statesman, GPI inputs or remote CONTROL settings from the front
panel overriding the front PCB control settings. Press the CAL button to
update the display.
Menu numbering scheme
This manual uses a simple menu numbering convention based on the sequence
of keys required to reach each menu from the top level home menu. For
example, menu 1.1.2 is reached from the home menu by pressing F1, then F2.
Menu 1.1.2.1 is reached by pressing F1, F2 and then F1 again.
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Introduction
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Shorthand codes
The following shorthand codes are used in the control panel menus:
Menu code Function description
AES1/2 AES/EBU digital audio signal
COM (or Both) 1/2 Common to both channels
GPI General Purpose Interface INPUT
GPO General Purpose Interface OUTPUT
/ Indicates no-effect when used in front of menu code
/Rph NO phase inversion of right hand channel
Rph Right hand channel IS phase inverted
AUTO Follows ref input clock frequency between 30 and 50kHz
48K Locked to 48kHz crystal oscillator
DUAL Dual channel operation
SWAP Inputs are swapped
/SWAP Inputs are NOT swapped
SNGL Single channel mode
delay Time period required for signal to remain below threshold before input silent is
asserted
s Audio signal silent (below –50dBs FS longer than delay period)
Note: Remember, the ‘/’ symbol negates the effect of a menu code it precedes.
Setting channel gain and input termination
Please refer to the Hardware configuration section of the Installation chapter
for channel gain and input termination settings.
Audio Monitoring
Audio monitoring is provided at the card edge with two miniature stereo jack
socket. The left hand socket is connected to the Stereo 1 input signal and the
right hand socket is connected to the Stereo 2 input signal.
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Crystal Vision Using the front control panel
Status menus
Pressing F1 from the home menu will bring up the top status menu. The status
menus provide the following information:
• Audio silence sustain delay
• AES1 and AES2 status
Status menu structure Description
The top menu line displays the currently
selected sustained silence delay before the
‘Silence’ LEDs are illuminated, and (optionally)
the relevant GPI outputs are asserted low.
The F1 and F2 function keys select the AES1 or
AES2 channel status displays.
The AES1 or AES2 menus show if the AES
input is ‘OK’, ‘ERR’, or ‘missing’. If present
(OK), the actual current input sample rate and
sample rate tolerance is displayed. The standard
tolerance shown is <400 PPM or <4%.
Active audio channels are indicated by the
numbers 12 (Left = 1, Right = 2). Any silent
channels are indicated by the symbol ‘s’.
Note: ‘ERR’ indicates that the AES input signal does not match the operating
conditions. For example, the input sample rate is 32 kHz or 44.1 kHz,
when the DACA channel is set to ‘48 kHz Xtal Mode’.
Each input channel is equipped with ‘near silence’ detectors. If audio
signal levels are sustained at below –50 dBFS for more than a selected
period of time, a LED indicator for each channel comes on and an
appropriate GPI output can be asserted low.
Stereo 1 silent in either audio channel 1 or 2 will illuminate ‘silent’ LEDs
and assert GPO5 low if enabled. Stereo 2 silent in either audio channel 3
or 4 will illuminate ‘silent 2’ LED and assert GPO6 low if enabled.
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Crystal Vision Using the front control panel
Switch menus
Pressing F3 from the home menu will bring up the top Switch status
menu. This menu provides the following information:
• Further AES channel status
• Mode selected status
• GPI status
Switch menu structure Description
The ‘SWTCH’ menu displays the current module
settings.
The AES1 menus shows the current status of the
following settings 1 (AUTO/48K mode), 5 (Rph –
phase of right hand channel) and 7 (GPO 5
enabled or disabled)
The AES2 menus shows the current status of the
following settings 2 (AUTO/48K mode), 6 (Rph
or /Rph – phase of right hand channel) and 8
(GPO 6 enabled or disabled)
The COM menu (bottom line) shows the current
status effect of the following 3 (SNGL/DUAL)
and 4 (/SWAP or SWAP)
The GPI menu shows the status of GPI inputs 1 to
4
Note: The STATUS display data may differ from the SWITCH settings due to
Statesman, GPI inputs or remote CONTROL settings from the front
panel overriding the front PCB control settings. Press the CAL button to
update the display.
Control menus
Pressing F4 from the home menu will bring up the top Control menu. The
control menu allows the module’s front PCB switches to be overridden if
desired to allow control of:
• AUTO/Xtal lock
• Right hand channel phase
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• Single or Dual mode selection
• Silence threshold delay
• Re-establish LOCAL control
Control menu structure Description
The CNTRL menu allows remote access to the
functions normally controlled by front PCB
controls.
Use F3 and F4 in the AES1 menu to controls the
following functions; AUTO/48K mode (PCB
SW1) and Rph – phase of right hand channel
(PCB SW5)
Use F3 and F4 in the AES2 menu to control the
following function; AUTO/48K mode (PCB
SW2) and Rph – phase of right hand channel
(PCB SW6)
The BOTH menu controls the following
functions; SNGL/DUAL (PCB SW3), /SWAP or
SWAP (PCB SW4) and silence delay (HEX
switch SIL T)
Silence delay may be increased using the F3 ‘+’
or decreased using F4 ‘-‘ between 1.5s and 120s
in 8s steps. In SNGL mode use F2 to select the
AES channel before changing the delay.
Silence warning and loss of input warning status are normally routed by default
to the GPI port for each channel. To prevent silence detection from raising
alarms via GPI lines please refer to the Using Card edge controls chapter.
Accessing any remote CONTROL menu will always establish REMOTE
CONTROL MODE. If any PCB switch levers or the rotary hex switch is
altered, the module will switch back to ‘LOCAL CONTROL MODE’, and
operate in accordance with the front of PCB switch settings. It will remain that
way until any remote control command is received. The LOCAL button, F4 in
the CNTRL menu will also return the unit to local control.
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Introduction
Crystal Vision Using card edge controls
4 Using card edge controls
The front edge of the card provides power rail monitoring, a configuration
dip-switch, analogue audio monitoring outputs, and a rotary control to set the
silence threshold delay.
LEDs monitor power rails, input presence, input sample rate and local/remote mode.
Selecting the sample rate mode
The DACA214 channel operates in two main modes. The primary mode is for
48 kHz sample rates using crystal oscillators to re-clock the digital audio input
to achieve optimum distortion figures. This is referred to as ‘Xtal Mode’ and
should be used at all times if possible.
The second mode uses built in phase locked loops and VCOs to accept any
sample rate from 30 kHz to 50 kHz. This is referred to as ‘Auto Mode’, and
should be used when the incoming sample rate is outside 48 kHz +/- 50 PPM.
The sample rate mode for each channel can be controlled from the card edge
using the first two levers of the DIL switch as explained in the following
table:
Lever Function
1
2
Down = Ch 1 in Auto (30-50kHz) mode, Up = Ch 1 in Xtal (48kHz) mode
Down = Ch 2 in Auto (30-50kHz) mode, Up = Ch 2 in Xtal (48kHz) mode
Note: GPI connections to the ‘Auto’/ ‘Xtal’ mode change lines will override card
edge switches if
asserted to a logic low or grounded.
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Lever Function
3
Down = Channels swapped, Up = Normal
4
Down = Single channel mode – AES 1 feeds all outputs, Up = Normal
(Note: Lever 3 also Down will swap channels so AES 2 feeds all outputs)
5
Down = CH 1 output RHS inverted, Up = CH1 normal
6
Down = CH 2 output RHS inverted, Up = CH2 normal
Channel swapping, single channel mode and phase inversion
Channel routeing logic following the regeneration circuits allows the incoming
digital signals to be assigned to outputs in a variety of ways.
The possible variations are as follows:
• channels may be swapped so that AES 1 feeds Stereo Output 2 and AES
2 feeds Stereo Output 1
• both output stages may be assigned to either AES 1 or AES 2,
effectively doubling the duplicate outputs for a single digital input
• the phase of the right hand output of Stereo Output 1 OR Stereo Output 2
may be inverted The various channel shuffling modes are selected as follows:
Note: When used as a single input converter, the unused AES input will be
disabled and therefore
silent, even if an active AES feed is present.
GPI connections to the shuffling mode lines will override card edge
switches if asserted to
logic low or grounded.
Selecting silence warning options
The digital audio processing circuits include ‘near silence’ detectors. If the
audio signal levels are sustained at below –50 dBFS for more than a
selected period of time, a LED indicator comes on.
The top amber ‘SIL’ LED indicates that either the left or right channel of
the stereo AES1 signal has been silent, while the bottom ‘SIL’ LED shows
that either the left or right channel of the stereo AES 2 signal has been silent.
Silence warning and loss of input warning status are normally routed by default
to the GPI port for each channel.
Silence detection can be prevented from raising alarms via these GPI outputs as
follows:
Lever Function
7
8
Down = Disable Stereo 1 silence warning, Up = Enable
Down = Disable Stereo 2 silence warning, Up = Enable
Note: The routeing of ‘Loss of AES 1 or AES 2 input’ warnings to the GPI
port cannot be
disabled. Loss of AES 1 input always asserts GPO5
low. Loss of AES 2 input always
asserts GPO6 low.
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Introduction
Crystal Vision Using card edge controls
Setting the silence threshold
The Hex rotary switch, ‘SIL TIME’ is used to set the required sustained
silence period before the LED indicators are illuminated and associated
warnings raised. Switch position ‘0’ provides 1.5 seconds of sustained silence.
Positions ‘1’ through to ‘F’ provide a range of 8 to 120 seconds in 8-second
increments.
The following table shows each silence threshold timing available:
SIL TIME Threshold SIL TIME Threshold
0
1
2
3
4
5
6
7
1.5 seconds
8 seconds
16 seconds
24 seconds
32 seconds
40 seconds
48 seconds
56 seconds
8
9
A
B
C
D
E
F
64 seconds
72 seconds
80 seconds
88 seconds
96 seconds
104 seconds
112 seconds
120 seconds
Audio Monitoring
Audio monitoring is provided at the card edge with two miniature stereo jack
socket. The left hand socket is connected to the Stereo 1 output signal and the
right hand socket is connected to the Stereo 2 output signal.
Setting channel gain and input termination
Please refer to the Hardware configuration section of the Installation chapter
for channel gain and input termination settings.
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