EMR User's Guide
High Density Modular Audio Router (AES, Analog, MADI, TimeCode, Data)
SYSTEM OVERVIEW
Revision 1.8
Page 105
4.1.5. Optional Audio Features
The EMR audio components have several optional features that make the EMR a very powerful audio
solution. Each of the components is described in the following sub sections.
4.1.5.1. Sample Rate Conversion (+SRC)
The sample rate conversion option is available on the EMR AES input and output cards. The sample rate
conversion option provides the capability to modify the same rate of any incoming audio signal and
change it to a user specified sample rate that is locked to the frame reference. The sample rate
converters can by bypassed to allow Dolby E/D signals to pass or they can be set in auto mode so that
they are enabled only when PCM audio is detected.
Each module has two sample rate conversion blocks, allowing half the signals in the module to convert to
one sample rate and the other half to convert to another sample rate. The sample rate conversion also
applies to MADI inputs and outputs when supported. Individual channels within the MADI signal pass
through independent sample rate converters. Control of the sample rate converters is done using
VistaLINK
®
Pro which is detailed in section
4.1.5.2. Signal Processing (+DSP)
The signal processing option or audio processing option is available on the EMR AES and analog input
and output cards. The signal processing option provides the capability to adjust the gain between -24dBu
and +24dBu, invert the phase, and mute each mono audio channel. Each mono channel also contains a
quad-input mixer in the processing path. Figure
4-5 provides a conceptual view of the audio signal flow
through the various processing stages for one mono audio channel. Control of the processing stages is
done using VistaLINK
®
Pro which is detailed in section
4.1.5.3. Delay (+DLY)
The delay option is available on the EMR AES and analog input and output cards. The delay option
provides the ability to add delay to each mono audio signal on the module. Delay of up to 1.3 seconds
can be added to each path in sample increments. If the option is applied to both the input and output
modules then a total delay of 2.6 seconds can be applied to the entire audio path. Figure
4-5 shows
where the audio delay is applied with respect to the processing path. Control of the audio delay is done
using VistaLINK
®
Pro which is detailed in section