Crystal Vision Indigo DACA214 Manual de usuario

DACA214

Digital to analogue audio converter

Crystal Vision Ltd., Lion Technology Park, Station Road East, Whittlesford, Cambridge, CB22 4WL, England.

Tel: +44(0) 1223 497049 Fax: +44(0) 1223 497059 sales@crystalvision.tv 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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Crystal Vision DACA214 User Manual

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

DACA214 User Manual R1.92 04 February 2019

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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Crystal Vision

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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Crystal Vision

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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Crystal Vision

Introduction

Crystal Vision Statesman

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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Crystal Vision

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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Crystal Vision

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

DACA214 User Manual R1.99 04 February 2019

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