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.
DACA214 User Manual R1.9
8
04 February 2019