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Linear Acoustic AERO.mobile User Guide
Chapter 3: Applications
The AERO.mobile is intended to be used in an emission (transmission) environment. This
chapter discusses several common applications for the unit. General block diagrams are
provided to give the user a sense of some of what can be accomplished with the
AERO.mobile unit but are by no means the only uses for the device.
Figure 3-1 below is a very high-level view of the last stages of a typical broadcast plant sup-
porting both legacy analog transmission in addition to digital transmission. It can be seen
that the AERO.mobile is being used to process a main and an alternate program, produc-
ing smooth and consistent audio appropriate for transmission to all consumers.
The AERO.mobile is also fed with a contact closure from master control and the station
automation system to signify when alternate audio programming (ALT) such as EAS is
present and when it is missing. This controls the ALT functionality to provide a seamless
crossfade between alternate and main audio so this secondary path always has audio pres-
ent. This feature saves the cost and complexity of several additional external units that
would be required to perform this function.
It should be noted that the AERO.mobile can also accept and utilize metadata to control
processing as well as automatically mute unused input channels. This is useful when Main
In 3-6 might be presented with audio that would otherwise be ignored by downstream en-
coders controlled by metadata.
Metadata can be applied either via serial RS485 connection or it can be extracted from the
vertical ancillary space of an applied HD-SDI signal.
Finally, note that setting clock source to SDI is required if the unit is used in an installation
where the AERO.mobile is re-embedding audio.
NOTE: When using SDI re-embedding, clock source will be forced to SDI.
3.1
Mobile DTV Only Application
Figure 3-1 shows how an AERO.mobile can be installed to process a mobile-specific pro-
gram stream. Note that up to two separate audio programs can be accommodated by the
AERO.mobile.
The primary processor in the AERO.mobile can accept stereo or a full 5.1 channel pro-
gram which it will downmix to stereo before processing.
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