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E-Series Network / Apr 2007
H A R D W A R E
Digital Input Card (DI-NC4)
Overview
The DI-NC4 digital audio input cards for the E-SAT and MICROSAT
accept up to 4 AES-3 formatted stereo sources (i.e. 8 mono channels). An
Audio Configuration form in the supplied XPoint software allows the user to
set attributes for the input channels including signal name, location, and Stereo/
Mono. These signal attributes are pre-configured at the factory for stereo
operation.
Note: While it is possible to split the 4 stereo AES inputs into 8 mono channels,
there are still only 4 physical wires, each containing the 2-channel AES
formatted data.
A dedicated sample rate converter for each input re-clocks the incoming
audio data and phase locks it to the system’s master sample rate clock. Source
sample rates up to 96 kHz are supported.
AES Input Interface
The balanced digital audio inputs on the DI-NC4 card are transformer
coupled. AES receivers strip off the received sample rate clock and audio data
for further processing by sample rate converters. The balanced interface
operates at a nominal peak-to-peak input voltage of 5V with an input imped-
ance of 110 Ohm and conforms to the AES-3 1992 electrical specification.
Note that Channel Status data is not forwarded.
While unbalanced SPDIF formatted input signals may be connected to the
HI and LO inputs of an AES input channel (leave the shield floating), it is
recommended that a BALUN or other external matching device be inserted to
convert the SPDIF impedance to 110 Ohm with a signal level of at least 1V p-
p.
Содержание E-SAT
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