Chapter 1: Introduction and Overview
The Linear Acoustic AERO.lite™ is a compact stereo transmission loudness
controller for digital television audio, with the following features:
^ AEROMAX® 2.0 channel multistage adaptive wideband and multiband
loudness control engine
^ AES I/O with reference input
^ Auto-sensing HD/SD-SDI inputs and access to all 16 audio channels
^ Ba4dBu analog I/O and front panel headphone output
^ Parallel GPI/O control port for alarms and control
^ Flexible audio routing allows conversion between analog, AES, and SDI
^ Internal auto-sensing power supply
^ Utility ITU BS.1770 loudness meter (Optional)
^ SNMP signaling (Optional)
^ Backup external 12VDC supply (Optional)
1.1 Principles of Operation
The AERO.lite is a simplified, 2-channel (stereo) version of the Linear Acoustic
AERO.one transmission loudness manager. It employs the same integrating long-
term loudness controller and multiband short-term loudness controllers found in the
AERO.lite and other AERO-series products.
Specific processing presets and adjustments are discussed in Chapter 4. Figure
1-1 shows the internal audio path of the AERO.lite.
1.2 Location of AERO.lite
Audio processors can be placed in a variety of locations depending upon the
design of the transmission path. We recommend you keep the AERO.lite as near
to the final emission DTV encoder as possible, as the units work closely together
and will benefit from short cable runs and common clocking.
1.3 Reference Levels
The AERO.lite is designed to support a standard reference level of -20dBFS via its
digital inputs. Analog inputs support nominal levels from +4dBu (nominal) to
+24dBu (maximum). Other levels are supported as the slow-moving Input AGC will
easily compensate for differences.
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