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
DACA214 User Manual R1.9
3
04 February 2019