Operating instructions
OPTIMOD-AM DIGITAL INTRODUCTION
1-7
Input/Output Configuration
OPTIMOD-AM simultaneously accommodates:
Digital AES3 left/right inputs and outputs.
Analog left/right inputs and outputs.
Digital AES3 Left/Right Input/Outputs
The digital inputs and outputs conform to the professional AES3 standard. They
both have sample rate converters to allow operation at 32, 44.1, 48, 88.2, and 96
kHz sample frequency.
The left/right digital input is on one XLR-type female connector on the rear panel;
the left/right digital outputs are on two XLR-type male connectors on the rear panel.
OPTIMOD-AM provides digital and analog inputs and outputs. You select whether
OPTIMOD-AM uses the digital or analog input either locally or by remote interface.
If OPTIMOD-AM is set to accept a digital input and the feed fails, OPTIMOD-AM will
automatically switch back to the analog input.
If you are operating in mono, the 9400 can receive the signal from the left, right, or
sum of the left and right channels of either the analog or digital inputs. The 9400
can simultaneously process for HD AM in stereo while processing for the analog
channel in mono.
Level control of the AES3 input is accomplished via software control through System
Setup (see step 6 on page 2-26) or through PC Remote.
Both analog and digital outputs are active continuously
.
The 9400’s output sample rate can be locked either to the 9400’s internal crystal
clock or to the sample rate present at its AES3 input.
The 9400 can apply J.17 de-emphasis to signals applied to its digital input and J.17
pre-emphasis to the processed signal emitted from its digital output. J.17 is a 6
dB/octave shelving pre-emphasis / de-emphasis standard with break points at 400 Hz
and 4 kHz. It is mainly used in older studio / transmitter links that use NICAM tech-
nology. The 9400’s provisions for J.17 make it fully compatible with systems using
this standard.
Analog Left/Right Input/Outputs
The left and right analog inputs are on XLR-type female connectors on the rear
panel. Input impedance is greater than 10k; balanced and floating. Inputs can ac-
commodate up to +27dBu (0dBu = 0.775Vrms).