LOUDNESS CONTROL: TRANSMISSION
Engineered on the foundation of the company’s supremely successful
first and second generation digital television audio processors,
the third-generation AERO.air enables broadcasters to deliver
compelling 5.1-channel surround sound while saving time,money, and
space. The AERO.air also represents the world’s first TV audio
processor to feature built-in Dolby® Digital (AC-3) encoding. The comprehensive AERO.air is equipped with multiple loudness
controllers, dual upmixers, metadata management, as well as full-time
two-channel downmixing to support legacy stereo or analog paths.
Built-in AutoMAX-II™ processing detects incoming audio and
automatically upmixes only when necessary, producing a full-time
compelling 5.1-channel output. The processor accepts 5.1-channel
network audio, two-channel local audio, SAP/DVS, and digital or
analog auxiliary/EAS audio for processing. Available options include
HD/SD-SDI input for de-embedding any of the possible 16 audio
channels and vertical ancillary (VANC) metadata,
internal 5.1+2 dual Dolby Digital (AC-3) encoders, HD/SD-SDI I/O for
de-embedding and re-embedding up to 16 channels of audio plus SMPTE
2020 (VANC) metadata, auto-sensing Dolby E/AC-3 decoding, and
CrowdControl™ dialog protection.The AERO.air is available in two configurations to support needs
ranging from simple dual stereo to 10 channels. Customers can
purchase with confidence knowing that their investment can be
upgraded to the fully featured version by purchasing an update that
can be installed via the front panel in just minutes.
The AERO.one is also available in a
dual stereo (2+2) version for stereo and SAP processing. This
version also contains a downmixer allowing input of 5.1 channel
audio and output of stereo LoRo or LtRt.
Audio for mobile DTV presents new
challenges. The dynamic range “comfort zone” used for mixing television
audio for viewing on stereo or surround in-the-home televisions is far
too wide for comfortable listening on typical earbuds or tiny speakers.
Background noise in many environments will define a relatively high
loudness floor — if the volume is increased for acceptable
intelligibility on soft passages, loud passages run the risk of causing
hearing damage.The AERO.mobile™ employs newly developed psychoacoustic processing that
enables content to remain audible in noisy environments on small mobile
devices. Accepting mono, stereo, or Dolby® 5.1-channel station audio,
the unit includes all tools a broadcaster needs to deliver the most
satisfying experience appropriate for widely varying individual
LOUDNESS CONTROL: INGEST/QC
The AERO.qc allows users to fix loudness problems automatically and
in real time as audio enters the plant and is fed into the ingest
server. This ingest quality control system from Linear Acoustic
provides all of the tools necessary to get audio loudness right. The
AERO.qc couples the ITU BS.1770 loudness-measurement specification
with proprietary signal evaluation techniques to evaluate content
and make adjustments. Operator
intervention can range from full control of measurement and audio
adjustment to highly automated processing that requires little
oversight. Front-panel metering offers instant go/no-go feedback and
precise loudness adjustment. Options include Dolby E/AC-3 decoding,
additional advanced production upmixing algorithms, AERO-style
multiband loudness and dynamic range control, metadata generation
and monitoring, multichannel
analog output with speaker EQ, and HD/SD-SDI input and output. A
hardware remote volume and speaker control is available separately.
AERO.file brings Linear Acoustic multipass
scaling, loudness range control, and UPMAX-II® upmixing and downmixing
to file-based workflows, without the need for external hardware devices.
AERO.file was designed in collaboration with RadiantGrid Technologies,
the developer of leading-edge transcoding, transformation, and new media
automation service platforms, to deliver best-in-class solutions for
loudness and audio control in file-based workflows. It’s the first of
several new solutions addressing this goal. AERO.file uses RadiantGrid transwrapping functionality to pass through
video streams of any type while separately performing audio functions
via the AERO.qc Loudness Correction module (a software version of the
AERO.qc hardware product). The triple-pass approach enabled by working
in the software domain guarantees the loudness target can be met
independent of other processing choices and preserves the quality of the
Options include Dolby Digital (AC-3),
Dolby E decoding, dual power supplies, and TCP/IP remote.
- A utility audio delay to allow up
to three frames of compensation for external video monitors.
- A 16-channel mode allows all
applied audio channels to be displayed simultaneously and reproduced
individually or as a 5.1 downmix.
- Quick navigation through four
dedicated function keys that allow direct channel selection, instant
preset recall, and downmix configuration.
The LQ-1000 evolved from extensive field experience with mixers and
broadcasters during post production and high-profile live events.
comprehensive loudness and peak level metering of up to eight
channels of 5.1 surround and/or stereo AES or SDI audio per
industry-standard ITU-R BS.1770, a crucial requirement for mixing
and transmitting in compliance with ATSC Recommended Practice A/85.
The 2RU device features a clear at-a-glance display
of all critical parameters on a large color OLED display. The
LQ-1000 offers metering in a simple cost-effective package for studio
mixing and plant-wide monitoring, making it ideal for
ingest and live sports event metering and control. Deploying the
LQ-1000 and AERO.qc throughout a facility maintains a common user
interface and display, improving consistency and reducing
Designed to enable audio and metadata monitoring throughout the entire
broadcast chain, the Linear Acoustic LAMBDA professional digital audio
and metadata monitor displays and reproduces up to 16 audio channels
from AES or embedded HD/SD-SDI input. The system accepts audio metadata
via 9-pin serial input or extracts it from the VANC space of an applied
HD-SDI input. Audio and metadata are displayed in combination to allow
for accurate monitoring. Included loudness monitoring per ITU BS.1770
enables operators to verify program loudness quickly and accurately. Any
channel, channel pair, or downmix can be monitored through the powerful
amplified two-way aluminum alloy subwoofer and HF speakers, a
front-panel headphone connector, or rear-panel balanced analog and AES
digital output. Options include Dolby Digital (AC-3),
Dolby E decoding, dual power supplies, and TCP/IP remote.
METADATA & TOOLS
The Linear Acoustic Model LA-5180 Audio
Metadata Frame Synchronizer and Generator is an integral part of any
facility relying on the successful creation and continuity of
metadata for proper audio encoding. Useful in digital television
transmission, remote production, and DVD creation environments, the
flexible unit accepts professional audio metadata via a standard
RS-485 serial input, or as delivered inside the VANC space of an
HD-SDI stream. Model LA-5180 allows correction of incoming
errors, re-writing of all parameters and reversion to fully
adjustable internally generated values output via serial and HD-SDI.
Can also be used as a stand-alone generator. Optional AMAS Metadata
Analysis Software provides detailed display and analysis of critical
metadata parameters and user-definable limits for values drives error
indication and logging.