AERO.lite
DTV Audio/Loudness Manager
User Manual
Release Date: February 2012
Software Version: 0.0.10
Linear Acoustic Inc.
Phone: 717-735-3611
Fax: 717-735-3612
Web: www.linearacoustic.com
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Warranty Information
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Chapter 1: Introduction and Overview
1.1
Principles of Operation ............................................................................3
1.2
Location of AERO.lite ..............................................................................3
1.3
Reference Levels ....................................................................................3
Chapter 2: Connections and Quick Setup
2.1
Unpacking and Inspection .......................................................................5
2.2
Installation ...............................................................................................5
2.3
Rear Panel ..............................................................................................6
^ RS-485 Connection ..............................................................................6
^ 2.3.1 GPI/O .........................................................................................6
^ 2.3.2 ETHERNET ................................................................................6
^ 2.3.3 SDI I/O ........................................................................................6
^ 2.3.4 AES I/O .......................................................................................6
^ 2.3.5 AES Reference I/O .....................................................................6
^ 2.3.6 Analog I/O ...................................................................................6
^ 2.3.7 Power .........................................................................................7
2.4
Quick Setup Notes ..................................................................................7
Chapter 3: Detailed Operation and Menus
3.1
Main Menu (Signal Status Meters) ..........................................................9
^ 3.1.1 Audio Input/Output Meters and LKFS Display ............................9
^ 3.1.2 AGC/Processing Meters .............................................................9
^ 3.1.3 GPI Status Display .....................................................................9
^ 3.1.4 GPO Status Display ...................................................................9
3.2
Statistics Menu ......................................................................................10
^ 3.2.1 Firmware Version......................................................................10
^ 3.2.2 Device Options .........................................................................10
^ 3.2.3 App Uptime ...............................................................................10
^ 3.2.4 Ref Chg ....................................................................................10
^ 3.2.5 Reset LKFS ..............................................................................10
^ 3.2.6 SNMP Trap Err(or)s ..................................................................10
^ 3.2.7 SNMP Tx Errors .......................................................................10
^ 3.2.8 SNMP Rx Errors .......................................................................10
^ 3.2.9 SNMP Pkt .................................................................................10
^ 3.2.10 DSP 1 Version ........................................................................10
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^ 3.2.11 DSP 1 Tx Errors ......................................................................10
^ 3.2.12 DSP 1 Rx Errors .....................................................................10
^ 3.2.13 DSP 2 Version ........................................................................11
^ 3.2.14 DSP 2 Tx Errors .....................................................................11
^ 3.2.15 DSP 2 Rx Errors .....................................................................11
^ 3.2.16 AES In Detect .........................................................................11
3.3
Setup Menu ...........................................................................................11
3.4
Presets Menu ........................................................................................11
^ 3.4.1 User Preset ..............................................................................11
3.5
I/O Menu ................................................................................................11
^ 3.5.1 Master Bypass .........................................................................11
^ 3.5.2 GPI Control ...............................................................................12
^ 3.5.3 GPI Function (GPI 1-4) .............................................................12
^ 3.5.4 GPI Preset (GPI 1-4) ................................................................12
^ 3.5.5 Channel Mode ..........................................................................12
^ 3.5.6 SRC Bypass .............................................................................12
^ 3.5.7 Headphone Boost .....................................................................12
^ 3.5.8 Clock SRC Type .......................................................................12
^ 3.5.9 Clock Source ............................................................................12
^ 3.5.10 Proc In 1/2 Src .......................................................................13
^ 3.5.11 SDI Embed Audio ...................................................................13
^ 3.5.12 SDI Out ...................................................................................13
^ 3.5.13 Integration Time (ITU Meter Option) ......................................13
^ 3.5.14 GPO (1-4) Alert When ............................................................14
^ 3.5.15 GPO Threshold (1-4) ..............................................................14
^ 3.5.16 GPO On Delay (1-4) ...............................................................14
^ 3.5.17 GPO Off Delay (1-4) ...............................................................14
3.6
Communication Menu ...........................................................................14
^ 3.6.1 IP Address ................................................................................14
^ 3.6.2 Net Mask ..................................................................................14
^ 3.6.3 Port Number .............................................................................15
^ 3.6.4 MAC Address ...........................................................................15
^ 3.6.5 SNMP Trap Address (1 & 2) .....................................................15
3.7
System Menu.........................................................................................15
3.8
ITU-R BS.1770 Meter (Option) ..............................................................15
3.9
SNMP (Option) ......................................................................................16
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Chapter 4: Presets and Processing
4.1
Description of Factory Presets ..............................................................22
4.2
Processing Structure .............................................................................23
4.3
Input AGC ..............................................................................................23
^ 4.3.1 Gate Threshold .........................................................................24
^ 4.3.2 Freeze Thresh(old) ...................................................................24
4.4
Multiband AGC.......................................................................................24
^ 4.4.1 Density .....................................................................................24
4.5
Multiband Levels ...................................................................................24
4.6
Final Stage ............................................................................................25
^ 4.6.1 Output Lim(iter) Drive ...............................................................25
^ 4.6.2 Master Output ...........................................................................25
Chapter 5: Troubleshooting
5.1
Problems and Possible Causes ............................................................26
^ 5.1.1 Unit Won’t Power On ................................................................26
^ 5.1.2 Output Audio Clicks and Pops ..................................................26
^ 5.1.3 Audio Pumps and Breathes ......................................................26
^ 5.1.4 Problems with EAS Encoding ...................................................26
Chapter 6: Specifications
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Regulatory Information and Fusing
FCC
This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed and used
in accordance with this instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at his or her own
expense.
Canada
This Class A digital apparatus complies with Canadian ICES-003.
UL
WARNING: Troubleshooting must be performed by a trained
technician. Do not attempt to service this equipment unless you are
qualified to do so.
Check that the correct fuses have been installed. To reduce the risk of
fire, replace only with fuses of the same type and rating.
Exposed portions of the power supply assembly are electrically “hot”. In order to reduce the risk
of electrical shock, the power cord MUST be dis-connected when the power supply assembly is
removed.
The ground terminal of the power plug is connected directly to
the chassis of the unit. For continued protection against electric
shock, a correctly wired and grounded (earthed) three-pin
outlet must be used. Do not use a ground-lifting adapter and
never cut the ground pin. on the three-prong plug.
UK
As the colours of the cores in the mains lead may not correspond with the coloured markings
identifying the terminals in your plug, proceed as follows:
The core that is coloured green and yellow must be connected to the terminal in
the plug identified by the letter E or by the earth symbol
or coloured green or
green and yellow.
The core that is coloured blue must be connected to the terminal that is marked
with the letter N or coloured black.
The core that is coloured brown must be connected to the terminal that is marked
with the letter L or coloured red.
This apparatus must be earthed.
#:?62C4@FDE:4)&=:E6)68F=2E@CJ ?7@C>2E:@?2?5FD:?8
EU
This equipment complies with the EMC requirements of EN55103-1 and EN55103-2 when
operated in an E2 environment in accordance with this manual.
IMPORTANT SAFETY NOTICE
This unit complies with the safety standard EN60065. The unit shall not be exposed to dripping or
splashing and no objects filled with liquids, such as coffee cups, shall be placed on the
equipment. To ensure safe operation and to guard against potential shock hazard or risk of fire,
the following must be observed:
o Ensure that your mains supply is in the correct range for the input power requirement of the
unit.
o Ensure fuses fitted are the correct rating and type as marked on the unit.
o The unit must be earthed by connecting to a correctly wired and earthed power outlet.
o The power cord supplied with this unit must be wired as follows:
Live—Brown
Neutral—Blue
Earth—Green/Yellow
IMPORTANT – NOTE DE SECURITE
Ce materiel est conforme à la norme EN60065. Ne pas exposer cet appareil aux éclaboussures
ou aux gouttes de liquide. Ne pas poser d'objets remplis de liquide, tels que des tasses de café,
sur l'appareil. Pour vous assurer d'un fonctionnement sans danger et de prévenir
tout choc électrique ou tout risque d'incendie, veillez à observer les recommandations suivantes.
o Le selecteur de tension doit être placé sur la valeur correspondante à votre alimentation
réseau.
o Les fusibles doivent correspondre à la valeur indiquée sur le materiel.
o Le materiel doit être correctement relié à la terre.
o Le cordon secteur livré avec le materiel doit être cablé de la manière suivante:
Phase—Brun
Neutre—Bleu
Terre—Vert/Jaune
WICHTIGER SICHERHEITSHINWEIS
Dieses Gerät entspricht der Sicherheitsnorm EN60065. Das Gerät darf nicht mit Flüssigkeiten
(Spritzwasser usw.) in Berührung kommen; stellen Sie keine Gefäße, z.B. Kaffeetassen, auf das
Gerät. Für das sichere Funktionieren des Gerätes und zur Unfallverhütung (elektrischer Schlag,
Feuer) sind die folgenden Regeln unbedingt einzuhalten:
o Der Spannungswähler muß auf Ihre Netzspannung eingestellt sein.
o Die Sicherungen müssen in Typ und Stromwert mit den Angaben auf dem Gerät
übereinstimmen.
o Die Erdung des Gerätes muß über eine geerdete Steckdose gewährleistet sein.
o Das mitgelieferte Netzkabel muß wie folgt verdrahtet werden:
Phase—braun
Nulleiter—blau
Erde—grün/gelb
NORME DI SICUREZZA – IMPORTANTE
Questa apparecchiatura è stata costruita in accordo alle norme di sicurezza EN60065. Il prodotto
non deve essere sottoposto a schizzi, spruzzi e gocciolamenti, e nessun tipo di oggetto riempito
con liquidi, come ad esempio tazze di caffè, deve essere appoggiato sul dispositivo. Per una
perfetta sicurezza ed al fine di evitare eventuali rischi di scossa êlettrica o d'incendio vanno
osservate le seguenti misure di sicurezza:
o Assicurarsi che il selettore di cambio tensione sia posizionato sul valore corretto.
o Assicurarsi che la portata ed il tipo di fusibili siano quelli prescritti dalla casa costruttrice.
o L'apparecchiatura deve avere un collegamento di messa a terra ben eseguito; anche la
connessione rete deve
avere un collegamento a terra.
o Il cavo di alimentazione a corredo dell'apparecchiatura deve essere collegato come segue:
Filo tensione—Marrone
Neutro—Blu
Massa—Verde/Giallo
#:?62C4@FDE:4)&=:E6)68F=2E@CJ ?7@C>2E:@?2?5FD:?8
AVISO IMPORTANTE DE SEGURIDAD
Esta unidad cumple con la norma de seguridad EN60065. La unidad no debe ser expuesta a
goteos o salpicaduras y no deben colocarse sobre el equipo recipientes con liquidos, como tazas
de cafe. Para asegurarse un funcionamiento seguro y prevenir cualquier posible peligro de
descarga o riesgo de incendio, se han de observar las siguientes precauciones:
o Asegúrese que el selector de tensión esté ajustado a la tensión correcta para su alimentación.
o Asegúrese que los fusibles colocados son del tipo y valor correctos, tal como se marca en la
unidad.
o La unidad debe ser puesta a tierra, conectándola a un conector de red correctamente
cableado y puesto a tierra.
o El cable de red suministrado con esta unidad, debe ser cableado como sigue:
Vivo—Marrón
Neutro—Azul
Tierra—Verde/Amarillo
VIKTIGA SÄKERHETSÅTGÄRDER!
Denna enhet uppfyller säkerhetsstandard EN60065. Enheten får ej utsättas för yttre åverkan
samt föremål innehållande vätska, såsom kaffemuggar, får ej placeras på utrustningen." För att
garantera säkerheten och gardera mot eventuell elchock eller brandrisk, måste följande
observeras:
o Kontrollera att spänningsväljaren är inställd på korrekt nätspänning.
o Konrollera att säkringarna är av rätt typ och för rätt strömstyrka så som anvisningarna på
enheten föreskriver.
o Enheten måste vara jordad genom anslutning till ett korrekt kopplat och jordat el-uttag.
o El-sladden som medföljer denna enhet måste kopplas enligt foljande:
Fas—Brun
Neutral—Blå
Jord—Grön/Gul
BELANGRIJK VEILIGHEIDS-VOORSCHRIFT:
Deze unit voldoet aan de EN60065 veiligheids-standaards. Dit apparaat mag niet worden
blootgesteld aan vocht. Vanwege het risico dat er druppels in het apparaat vallen, dient u er geen
vloeistoffen in bekers op te plaatsen. Voor een veilig gebruik en om het gevaar van electrische
schokken en het risico van brand te vermijden, dienen de volgende regels in acht te worden
genomen:
o Controleer of de spanningscaroussel op het juiste Voltage staat.
o Gebruik alleen zekeringen van de aangegeven typen en waarden.
o Aansluiting van de unit alleen aan een geaarde wandcontactdoos.
o De netkabel die met de unit wordt geleverd, moet als volgt worden aangesloten:
Fase—Bruin
Nul—Blauw
Aarde—Groen/eGel
#:?62C4@FDE:4)&=:E6)68F=2E@CJ ?7@C>2E:@?2?5FD:?8
WARNING: To reduce the risk of fire, replace fuses only with the
same type and rating.
Both units use a universal switching power supply that handles the full range of nominal
mains voltages between 90 and 264 VAC and any frequency between 50 Hz and 60 Hz.
Check Main Fuse
The Main fuse rating is T 1A L (1 Amp, 250 V, 20 mm, time-lag, low breaking capacity) for
all operating voltages.
WARNING: The power to the unit must be off when the
following steps are performed. Ensure that the main power
cable to the unit is not connected to a power source.
1. Open the fuse compartment door in the AC power input housing with a
small flat-blade screwdriver (Figure 1). Carefully pull out the fuse carrier.
2. Check that the replacement fuse has the correct rating. The fuse carrier
must be inserted into the compartment carefully. Do not force the carrier
into the compartment or both could be damaged.
3. Snap the fuse compartment door closed.
Figure 1 Checking the Main Fuse
Internal Fuse
The switching power supply contains a separate fuse. Most fault conditions should be
protected by the main fuse.
If you find it necessary to replace the internal fuse, be certain to replace it with a fuse of
the same type and rating as printed on the switching power supply board.
#:?62C4@FDE:4)&=:E6 ?EC@5F4E:@?2?5&G6CG:6H
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
^
Balanced +4dBu 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 longterm 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.
3
#:?62C4@FDE:4)&=:E6 ?EC@5F4E:@?2?5&G6CG:6H
Figure 1.1 AERO.lite Internal Audio Path
Relay
Bypass
SDI In
(HD/ SD)
HD/ SD-SDI
Demux
HD/ SD-SDI
M ux
Ref Sel
SDI-Out
(HD/ SD)
48kHz
Int.
Relay
Bypass
24-Bit
SRC
Analog
In
(XLR)
L
R
Ethernet
GPI In
90-264VAC
35W
12VDC
Aeromax
Loudness
DRC 2.0
Chan M ode
Stereo
M ono (1+ 2)
M ono 1 (1/ 1)
M ono 2 (2/ 2)
Proc
1/ 2
D/ A &
Driver
Rx
Analog
In
ITU
M eter
(Opt.)
D/ A &
Driver
AES
Ref
1/ 2
M ain Out
SDI In
1-16
SDI
1-16
Input Set
Rx
Receiver
& A/ D
AES
24-Bit
SRC
L
R
L
R
Analog Out
(XLR)
Headphone Out
(Via FP 6.3mm)
GPI Out
CPU
Internal
PSU
External PSU
(Opt.)
4
#:?62C4@FDE:4)&=:E6@??64E:@?D2?5(F:4<*6EFA
Chapter 2: Connections and Quick Setup
Far be it for us to get in the way of you and compelling audio. We want you to get your
new AERO.lite up and running just as quickly as you do, and realize this is not the most
exciting portion of any user manual. However, being thorough and careful now can
prevent common issues related to improper installation later. Honest.
2.1 Unpacking and Inspection
Before unpacking the unit, inspect the outer carton for shipping damage. We use
carefully designed shipping cartons and packing materials to protect our products during
shipment, but sometimes, bad things happen in transit. If the carton shows damage,
inspect the unit carefully in those areas.
In the unlikely even that the unit ever needs to be returned to to the factory, alternate
cartons and packing materials may not adequately protect the contents. Therefore, we
strongly encourage you to please save the original carton and packing materials.
In addition to a shiny new AERO.lite, we have also included a bag containing a quickstart sheet to get you up and running, an IEC power cord (style matches country of
order), this manual, and the much sought-after Linear Acoustic Sharpie marker.
You’ll also find the much maligned warranty card, which nearly everyone keeps with the
manual (where it does neither you nor us any good). Please, keep your New Year’s
resolution to always do the right thing, fill out the card, and mail it in. It will allow us to get
in contact with you for software or documentation updates, and we promise only to use
the information for good, never evil. We won’t clog your actual or electronic mailboxes
with unsolicited stuff, and we’ll never, ever share your information. Alternatively, you may
FAX the card to us at +1-717-735-3612. Thank you in advance for helping us help you!
2.2 Installation
AERO.lite installation requires:
^
One standard rack space unit with ADEQUATE VENTILATION. The unit relies
on convection cooling from the side-panel vents).
^
Standard 75-Ohm BNC cables for digital signal connections. To connect digital
equipment with 110-Ohm XLR connectors, use impedance-matching
transformers (available from Canare, Neutrik, and other manufacturers).
^
Standard balanced XLR cables for analog signal connections.
^
Proper reference. The unit provides an internal 48kHZ reference input, or it can
be synchronized to an external source via the AES Reference Input. All inputs
have Sample Rate Converters (SRC’s) but a master reference is required.
Proper reference signal selection and application is imperative for an artifact-free
installation. Clicks or pops in the audio can usually be traced back to improper
reference configuration.
#:?62C4@FDE:4)&=:E6@??64E:@?D2?5(F:4<*6EFA
2.3 Rear Panel
The rear panel of the AERO.lite contains its electrical, signal, and control connections.
Specific pinout information for GPI I/O is provided in Chapter 5.
Figure 2-1 Rear Panel
RS-485 Connection
%@EFD652EE9:DE:>6
2.3.1 GPI/O
Connect dry contact closures here to for external control of certain functions. For
example, you may wish to set up a means to recall a “Bypass Processing” preset if EAS
is inserted ahead of the AERO.lite (though installing your EAS unit after the AERO.lite is
preferred). Note that GPI functions require held closures for the duration of the desired
function.
2.3.2 ETHERNET
10/100 BASE-T Network connection used for firmware upgrades and SNMP reporting.
2.3.3 SDI I/O
Permits de-embedding and re-embedding any of the 16 available channels in an applied
HD-SDI or SD-SDI signal.
NOTE: Appropriate reference must be applied AND selected for proper
operation. To aid in this critical setting, if SDI embedding is enabled, the
clock source will automatically be set to SDI.
2.3.4 AES I/O
Inputs and outputs for 75-Ohm digital audio input and output. Note that the sync
reference can be set to use this AES Input, or if the input signal is not referenced to the
plant or is at a rate other than 48kHz, select the AES or SDI reference.
2.3.5 AES Reference I/O
Use AES Reference I/O to resynchronize the AERO.lite to an external reference, and be
sure to choose AES Ref as the clock source in the Setup->I/O menu. Note that the AES
Reference output is active and is locked to the selected reference signal (Internal, SDI,
AES In, AES Ref In).
2.3.6 Analog I/O
Connect left- and right-channel analog Inputs and Outputs here. If you intend to use the
internally-generated 48kHz reference signal, the analog inputs and outputs can be
employed with no need for external reference signals.
#:?62C4@FDE:4)&=:E6@??64E:@?D2?5(F:4<*6EFA
2.3.7 Power
Connect the supplied IEC power cord to the internal power supply, and the (optional)
external 12VDC power supply to the Backup In connection.
NOTE: If using an alternate 12VDC power supply, it MUST be filtered
and regulated and have an output of +12VDC +/-5%. Any damage caused
by use of power supplies not provided by Linear Acoustic will not be
covered by the warranty.
2.4 Quick Setup Notes
The Linear Acoustic AERO.lite is configured at the factory and arrives ready to go on the
air after making the proper input and output connections and establishing the proper I/O
and clock sync settings.
?
Apply audio to the SDI, AES, AES Reference, or Analog inputs as appropriate for
your individual facilities.
?
In the Setup->I/O menu, make sure the Input source corresponds to the type of
input employed on the rear panel.
?
While in the Setup->I/O menu, be sure to choose the proper clock reference for
your application.
?
Processed audio will be available on all audio outputs.
The best way to learn the AERO.lite is to explore its different settings with audio applied
and monitored. There are several factory presets to support many different applications
and tastes. Some presets may not sound much different at first, but will perform
differently depending on program content.
NOTE:
For best audio quality, the AERO.lite should be the only
processor in line with station audio. Please make sure to remove any
legacy processing - especially anything that might be left over from
previous analog transmission operations - it will impair the performance of
the AERO.lite. We suggest checking station documentation and physical
installations to make sure the old gear has been removed.
#:?62C4@FDE:4)&=:E66E2:=65&A6C2E:@?2?5$6?FD
Chapter 3: Detailed Operation and Menus
This chapter takes a detailed look at the layout and operation of the Linear Acoustic
AERO.lite. Included here are examples of the front panel display and descriptions of the
various menus.
As you explore, keep in mind that moving the joystick (menu knob) to the left will always
back you out toward the Main menu, turning the knob allows parameter adjustment, and
The menus and submenus are structured in such a way that more complex functions are
situated deeper into the hierarchy. A compact version of the menu tree is provided
below, though you may find it most helpful to study the larger, fold-out menu tree at the
end of this chapter and keep it handy as you navigate the AERO.lite for the first time.
Figure 3-1 Menu Tree
8
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3.1 Main Menu (Signal Status Meters)
3.1.1 Audio Input/Output Meters and LKFS Display
Shows input and output audio levels on the left and right channels, and the current
loudness LKFS loudness measurements.
Figure 3-2 Input/Output Meters and LKFS Display
3.1.2 AGC/Processing Meters
Shows the amount of gain expansion or reduction of the wideband input AGC (W) and
each band of the multiband AGC’s (1-5). The stationary horizontal line in each band
represents 0dB - the center of the meter’s range. Meters above this line indicate
expansion; meters below it indicate compression (gain reduction). More downward
excursion of the meters represents more gain reduction is being applied.
Figure 3-3 Processing Meters
3.1.3 GPI Status Display
Shows the current status of each of the four General Purpose Inputs, plus the current
(active) preset.
Figure 3-4 GPI Status Display
3.1.4 GPO Status Display
Shows the current status of each of the four General Purpose outputs.
#:?62C4@FDE:4)&=:E66E2:=65&A6C2E:@?2?5$6?FD
3.2 Statistics Menu
Provides detailed information about software, firmware and DSP versions, DSP
communications status, device options, SNMP errors and packet information, and the
presence of AES pairs 1-8, in the following order as you navigate downward in the
menu:
3.2.1 Firmware Version
Shows current firmware version.
3.2.2 Device Options
Available options can be viewed by turning the menu knob.
3.2.3 App Uptime
Shows time running since the last reboot.
3.2.4 Ref Chg
Counts the number of times the system reference has changed since last reboot or
reset. Moving the menu knob to the right resets the meter.
3.2.5 Reset LKFS
Shows the elapsed time since the last reset of the LKFS loudness meter. Moving the
menu knob to the right resets the meter.
3.2.6 SNMP Trap Err(or)s
Indicates the number of SNMP trap errors and the error codes. Moving the menu knob
to the right resets the meter.
3.2.7 SNMP Tx Errors
Shows the number of SNMP transmit errors and the error code. Moving the menu knob
to the right resets the meter.
3.2.8 SNMP Rx Errors
Shows the number of SNMP receive errors and the error code. Moving the menu knob
to the right resets the meter.
3.2.9 SNMP Pkt
Counts the number of trap, transmit, and receive packets since the last reboot or reset.
Moving the menu knob to the right resets all counts.
3.2.10 DSP 1 Version
Shows current DSP 1 version.
3.2.11 DSP 1 Tx Errors
Shows the number of transmit errors between micro and DSP 1 and the error codes.
Moving the menu knob to the right resets the meter.
3.2.12 DSP 1 Rx Errors
Shows the number of receive errors between micro and DSP 1 and the error codes.
Moving the menu knob to the right resets the meter.
#:?62C4@FDE:4)&=:E66E2:=65&A6C2E:@?2?5$6?FD
3.2.13 DSP 2 Version
Shows the current DSP 2 version.
3.2.14 DSP 2 Tx Errors
Shows the number of transmit errors between micro and DSP 1 and the error codes.
Moving the menu knob to the right resets the meter.
3.2.15 DSP 2 Rx Errors
Shows the number of receive errors between micro and DSP 1 and the error codes.
Moving the menu knob to the right resets the meter.
3.2.16 AES In Detect
Shows the presence of an AES carrier on any of the 8 audio channels.
3.3 Setup Menu
Entering the setup menu gives you access to several sub-menus, including the Presets,
I/O, Communication, and System menus.
Moving the menu knob down one step from the main Setup Menu takes you to the these
four sub-menus. Moving the menu knob left or right allows you to scroll between them.
Once you’ve entered one of the sub-menus, moving the menu knob up or down
navigates through the various functions of each.
Presets and processing are discussed in more detail in Chapter 4.
3.4 Presets Menu
3.4.1 User Preset
Shows the current (active) preset. Turning the menu knob scrolls through all available
factory and user presets. An asterisk (*) appears in the display as soon as you move
away from the currently employed preset. To put the preset on the air, move the menu
knob to the right.
Moving the menu knob down from the User Preset menu provides access to the Input
AGC, Multiband AGC, Multiband levels, Final Stage level, and the Preset Name editor.
Please see Chapter 4 for a complete explanation of the processing menus.
3.5 I/O Menu
The Input/Output menu is where input and output audio are selected to interface with the
loudness control (processing) engine.
3.5.1 Master Bypass
When enabled, de-energizes the audio and SDI relays for a hard bypass. This will
create a brief interruption of these signals, and is a feature primarily designed for
troubleshooting.
#:?62C4@FDE:4)&=:E66E2:=65&A6C2E:@?2?5$6?FD
3.5.2 GPI Control
When enabled, the unit is under GPI control and most front-panel controls are disabled.
You will also see a “g” in the left corner of the display indicating GPI control is active.
3.5.3 GPI Function (GPI 1-4
Selects the function of each GPI input. Selections are:
?None: No function has been assigned for this GPI (as you may have guessed)
?Preset: GPI selects a preset.
?Reset LKFS: Resets the LKFS loudness meter.
3.5.4 GPI Preset (GPI 1-4)
Defines which of the stored presets a GPI will recall. Any factory or user preset can be
recalled by GPI.
3.5.5 Channel Mode
Determines whether the output will be Stereo, Mono (L and R inputs combined in both L
and R outputs), Mono Ch 1 (L channel input present at both L and R outputs), Mono Ch
2 (R channel input present at both L and R outputs). An asterisk (*) appears in the
display as soon as you move away from the current setting. To put a new configuration
on the air, move the menu knob to the right.
3.5.6 SRC Bypass
When enabled, bypasses the Sample Rate Converters. If the AERO.lite is synchronized
to incoming signals and plant reference, there is no reason for the SRCs to be in line,
and bypassing them will lower latency by about 3 milliseconds.
3.5.7 Headphone Boost
When enabled, increases the output level of the front panel headphone jack by 12dB.
This enables very low-level audio to be heard. CAUTION: The headphone output can
get LOUD, please use this selection carefully.
3.5.8 Clock SRC Type
The default selection of “Stable” is intended for external clock sources which are stable
and unlikely to be disturbed (i.e. via asynchronous “crash” switching). If the chosen
reference is regularly interrupted (yes, we know) then select “Changing” which enables a
faster recovery from such disturbances.
3.5.9 Clock Source
Select SDI input, AES Input 1, AES Reference input, or Internal 48kHz (only for analog
or stand-alone use).
#:?62C4@FDE:4)&=:E66E2:=65&A6C2E:@?2?5$6?FD
Figure 3-5 Clock Source Status
NOTE: +96E@ADE2EFDD4C66?H:==:?5:42E6M%@)67N:7E9649@D6?
C676C6?46:D?@E56E64E65 7 ?E6C?2=<K:D49@D6?E96DE2EFD
D4C66?H:==:?5:42E65M ?E)67NE@:?5:42E6E92EH9:=6G2=:57@C2?2=@8
@?=J@A6C2E:@?E96F?:E:D?@EDJ?49C@?:K65E@2?JC676C6?46
3.5.10 Proc In 1/2 Src
Determines which source provides audio for the loudness processing engine. Turning
the menu knob scrolls through the following choices.
?SDI In (1/2, 3/4, 5/6, 7/8, 9/10, 11/12, 13/14, 15/16): Uses the selected SDI
audio pair.
?Analog XLR In: Uses the analog audio inputs.
?AES In 1/2: Used the AES inputs.
3.5.11 SDI Embed Audio
Selects whether to enable audio re-embedding or pass the SDI signal through the
AERO.lite untouched. Note this does not affect de-embedding, which is active at all
times.
3.5.12 SDI Out
Selects the source for re-embedding into an applied SDI signal. Choices are the
processed output (1/2), the input of any SDI pair, the AES inputs (1/2), the analog XLR
inputs (1/2), or Muted. Turning the menu knob scrolls through these choices.
3.5.13 Integration Time (ITU Meter Option)
Adjusts the length or storage time of the integrator for the loudness meter. Faster
settings (shorter times) will produce more quickly-moving readings and may result in less
accurate average loudness readings. Choices are 3 seconds, 10 seconds, 30 seconds,
and Infinite. The default setting is 10 seconds. Turning the menu knob scrolls through
available settings.
The ITU Meter Option is discussed in more detail at the end of this chapter.
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3.5.14 GPO (1-4) Alert When
Configures each of the four general purpose outputs
?Never: GPO inactive
?Follow GPI: Each GPO will match the state of the corresponding GPI, so that if
GPI 1 is commanded Low, GPO 1 will follow.
?LKFS Over Thr: GPO will be active if the currently monitored input audio
exceeds the adjustable threshold (described below).
?LKFS Under Thr: GPO will be active if the currently monitored input audio falls
below the adjustable threshold (described below).
?Silence Detect: GPO will be active if silence (no audio) is detected at the
currently selected input.
?Reference Loss: GPO will be active if a loss of the currently selected sync
reference is detected.
3.5.15 GPO Threshold (1-4)
Adjustable from Mute to 0db, with -40dB as the default by turning the menu knob.
3.5.16 GPO On Delay (1-4)
Adjusts how long the unit will wait before triggering the GPO. Settings between 0 and 20
seconds are selectable by turning the menu knob. The default setting is 0 seconds.
3.5.17 GPO Off Delay (1-4)
Adjusts how long to hold a GPO function once triggered.
3.6 Communication Menu
Displays and, where applicable, adjusts the IP address, subnet mask, and MAC
address. Changes can be made to the highlighted values by turning the menu knob. To
move back and forth between settable value fields, move the menu knob left or right. An
asterisk (*) indicates changes have been made to the particular parameter. To apply the
changes, move the menu knob to the right one step past the final field. When changes
are applied, the front panel logo backlight will turn red, the unit will immediately reboot,
and there will be an interruption to program audio.
3.6.1 IP Address
Allows you to assign an IP address to the AERO.lite.
3.6.2 Net Mask
Allows you to configure the subnet mask.
#:?62C4@FDE:4)&=:E66E2:=65&A6C2E:@?2?5$6?FD
3.6.3 Port Number
The port number is factory set at 2002.
3.6.4 MAC Address
Displays the unique MAC address of your particular AERO.lite.
3.6.5 SNMP Trap Address (1 & 2)
+H@EC2A '255C6DD6D42?36D6E2?52?J>6DD286DH:==36C6=2J65E@3@E9'=62D6D66
D64E:@?7@C56E2:=65*%$':?7@C>2E:@?
3.7 System Menu
Allows IP and I/O settings to be set back to factory defaults. These settings can be reset
individually or together by turning the menu knob to scroll through IP Comm, I/O, or All.
3.8 ITU-R BS.1770 Meter (Option)
The goal for most broadcasters today is to transmit a signal that pleases audiences and
is neither too loud nor too soft. If this is accomplished, and the transmitted loudness
matches the corresponding loudness metadata (called dialnorm in the Dolby Digital
encoder), compliant output can be achieved.
The ITU Meter Option is a simple utility ITU loudness meter used for calibrating the final
loudness of the AERO.lite. This meter and others like it are based on an international
standard developed to give an objective estimation of loudness levels, which are
normally very subjective.
ITU meters are not perfect. They get us closer to agreement, and as long as everyone
uses meters that comply with the BS.1770 standard, results can be much more
consistent world-wide.
Integration provides a running average of a certain times worth of audio samples. Longer
integration times give a better view of an entire program segment, with Infinite being the
best. However, an infinite integration must be reset after each segment, else the meter
becomes less sensitive to short term events that might occur and so is generally not a
practical choice for continuos metering. However, when used correctly it can be an ideal
choice and we provide a way to reset the meter via the front panel and a GPI control.
Very short integration times do not provide enough detail about the overall average for
longer program or commercial segments. The CRC in Canada determined that 3
seconds is about fastest useful integration time, but in practical terms for checking the
output of a station, it is probably still too fast. It will show variations quickly and tend to
result in overly dense processing settings.
The best results for continuous loudness monitoring will be obtained with 10-second or
30-second integration times. Known as “leaky integration” these settings provide a
continuous reset of the integrator. For the 10-second selection, samples that enter will
“leak out” the integrator after 10 seconds.
#:?62C4@FDE:4)&=:E66E2:=65&A6C2E:@?2?5$6?FD
3.9 SNMP (Option)
The AERO.lite supports error reporting via the Simple Network Management Protocol
(SNMP). Status of critical information such as PSU health, unit bypass, audio presence,
levels over/under threshold, loss of synchronization and others are reported.
The current AERO.lite MIB file is copied below. For use in an SNMP management
system, this data can simply be copied and pasted into a text file that can be re-named
LINEAR-ACOUSTIC-AERO-LITE.mib.
------------LINEAR-ACOUSTIC-LA2002-MIB DEFINITIONS ::= BEGIN
-- MIB for Linear Acoustic la2002 devices
IMPORTS
enterprises
TRAP-TYPE
OBJECT-TYPE
FROM RFC1155-SMI
FROM RFC-1215
FROM RFC-1212;
linearAcoustic OBJECT IDENTIFIER ::= { enterprises 28660 }
la2002
OBJECT IDENTIFIER ::= { linearAcoustic 2002 }
la2002-system OBJECT IDENTIFIER ::= { la2002 1 }
la2002-status OBJECT IDENTIFIER ::= { la2002 2 }
--- la2002-system
--- model
la-model
OBJECT-TYPE
SYNTAX
OCTET STRING (SIZE (0..40))
ACCESS
read-only
STATUS
mandatory
DESCRIPTION
"Linear Acoustic Model."
::= { la2002-system 1 }
-- software version
software-version OBJECT-TYPE
SYNTAX
OCTET STRING (SIZE (0..40))
ACCESS
read-only
STATUS
optional
DESCRIPTION
"Device's software version."
::= { la2002-system 2 }
-- firmware version
firmware-version OBJECT-TYPE
SYNTAX
OCTET STRING (SIZE (0..40))
ACCESS
read-only
STATUS
optional
#:?62C4@FDE:4)&=:E66E2:=65&A6C2E:@?2?5$6?FD
DESCRIPTION
"Devices's firmware version."
::= { la2002-system 3 }
--- la2002-status
--- Power Supply 1
power-supply-1 OBJECT-TYPE
SYNTAX
INTEGER {fail (1), ok (2)}
ACCESS
read-only
STATUS
mandatory
DESCRIPTION
"Status of power supply 1."
DEFVAL { 1 }
::= { la2002-status 1 }
-- Power Supply 2
power-supply-2 OBJECT-TYPE
SYNTAX
INTEGER {fail (1), ok (2)}
ACCESS
read-only
STATUS
optional
DESCRIPTION
"Status of power supply 2."
DEFVAL { 1 }
::= { la2002-status 2 }
-- Master Bypass
master-bypass OBJECT-TYPE
SYNTAX
INTEGER {off (1), on (2)}
ACCESS
read-only
STATUS
optional
DESCRIPTION
"Status of Master Bypass."
DEFVAL { 1 }
::= { la2002-status 3 }
-- System Reference
system-reference OBJECT-TYPE
SYNTAX
INTEGER {absent (1), present (2)}
ACCESS
read-only
STATUS
optional
DESCRIPTION
"Status of System Reference."
DEFVAL { 1 }
::= { la2002-status 4 }
-- Audio Detected (Primary)
pri-audio-detected OBJECT-TYPE
SYNTAX
INTEGER {no (1), yes (2)}
ACCESS
read-only
STATUS
optional
DESCRIPTION
#:?62C4@FDE:4)&=:E66E2:=65&A6C2E:@?2?5$6?FD
"Detection of Primary Audio Signal."
DEFVAL { 1 }
::= { la2002-status 5 }
-- GPO1 Current State
gpo1-status OBJECT-TYPE
SYNTAX
INTEGER {off (1), on (2)}
ACCESS
read-only
STATUS
optional
DESCRIPTION
"Status of GPO1."
DEFVAL { 1 }
::= { la2002-status 6 }
-- GPO2 Current State
gpo2-status OBJECT-TYPE
SYNTAX
INTEGER {off (1), on (2)}
ACCESS
read-only
STATUS
optional
DESCRIPTION
"Status of GPO2."
DEFVAL { 1 }
::= { la2002-status 7 }
-- GPO3 Current State
gpo3-status OBJECT-TYPE
SYNTAX
INTEGER {off (1), on (2)}
ACCESS
read-only
STATUS
optional
DESCRIPTION
"Status of GPO3."
DEFVAL { 1 }
::= { la2002-status 8 }
-- GPO4 Current State
gpo4-status OBJECT-TYPE
SYNTAX
INTEGER {off (1), on (2)}
ACCESS
read-only
STATUS
optional
DESCRIPTION
"Status of GPO4."
DEFVAL { 1 }
::= { la2002-status 9 }
-- GPO1 Current Assignment
gpo1-assignment OBJECT-TYPE
SYNTAX
OCTET STRING (SIZE (0..40))
ACCESS
read-only
STATUS
optional
DESCRIPTION
"Assignment of GPO1."
::= { la2002-status 10 }
-- GPO2 Current Assignment
#:?62C4@FDE:4)&=:E66E2:=65&A6C2E:@?2?5$6?FD
gpo2-assignment OBJECT-TYPE
SYNTAX
OCTET STRING (SIZE (0..40))
ACCESS
read-only
STATUS
optional
DESCRIPTION
"Assignment of GPO2."
::= { la2002-status 11 }
-- GPO3 Current Assignment
gpo3-assignment OBJECT-TYPE
SYNTAX
OCTET STRING (SIZE (0..40))
ACCESS
read-only
STATUS
optional
DESCRIPTION
"Assignment of GPO3."
::= { la2002-status 12 }
-- GPO4 Current Assignment
gpo4-assignment OBJECT-TYPE
SYNTAX
OCTET STRING (SIZE (0..40))
ACCESS
read-only
STATUS
optional
DESCRIPTION
"Assignment of GPO4."
::= { la2002-status 13 }
--- traps
--- 10/29/2010 RDC
-- Linear Acoustic rules for enterprise-specific traps
-- 1. Use trap numbers from 10 to 127.
-- This makes them different from generic traps (0 - 5) and
-- lets them fit into a consistent and small space in BER TLV packet.
-- 2. Do not include VARIABLES to keep the overall BER packet
-- size consistent.
-- Power Supply 1 failed
trap-ps1-failed TRAP-TYPE
ENTERPRISE la2002
DESCRIPTION
"Trap, Power Supply 1 failed."
::= 10
-- Power Supply 2 failed
trap-ps2-failed TRAP-TYPE
ENTERPRISE la2002
DESCRIPTION
"Trap, Power Supply 2 failed."
::= 11
-- Audio Loss (Primary)
trap-pri-audio-loss
TRAP-TYPE
#:?62C4@FDE:4)&=:E66E2:=65&A6C2E:@?2?5$6?FD
ENTERPRISE la2002
DESCRIPTION
"Trap, Primary Audio lost or not detected."
::= 12
-- Audio Detected (Primary)
trap-pri-audio-detected TRAP-TYPE
ENTERPRISE la2002
DESCRIPTION
"Trap, Primary Audio detected."
::= 13
-- GPO1 Turned On
trap-gpo1-on TRAP-TYPE
ENTERPRISE la2002
VARIABLES {gpo1-assignment}
DESCRIPTION
"Trap, GPO1 On"
::= 14
-- GPO1 Turned Off
trap-gpo1-off TRAP-TYPE
ENTERPRISE la2002
VARIABLES {gpo1-assignment}
DESCRIPTION
"Trap, GPO1 Off"
::= 15
-- GPO2 Turned On
trap-gpo2-on TRAP-TYPE
ENTERPRISE la2002
VARIABLES {gpo2-assignment}
DESCRIPTION
"Trap, GPO2 On"
::= 16
-- GPO2 Turned Off
trap-gpo2-off TRAP-TYPE
ENTERPRISE la2002
VARIABLES {gpo2-assignment}
DESCRIPTION
"Trap, GPO2 Off"
::= 17
-- GPO3 Turned On
trap-gpo3-on TRAP-TYPE
ENTERPRISE la2002
VARIABLES {gpo3-assignment}
DESCRIPTION
"Trap, GPO3 On"
::= 18
-- GPO3 Turned Off
trap-gpo3-off TRAP-TYPE
#:?62C4@FDE:4)&=:E66E2:=65&A6C2E:@?2?5$6?FD
ENTERPRISE la2002
VARIABLES {gpo3-assignment}
DESCRIPTION
"Trap, GPO3 Off"
::= 19
-- GPO4 Turned On
trap-gpo4-on TRAP-TYPE
ENTERPRISE la2002
VARIABLES {gpo4-assignment}
DESCRIPTION
"Trap, GPO4 On"
::= 20
-- GPO4 Turned Off
trap-gpo4-off TRAP-TYPE
ENTERPRISE la2002
VARIABLES {gpo4-assignment}
DESCRIPTION
"Trap, GPO4 Off"
::= 21
END
#:?62C4@FDE:4)&=:E6'C6D6ED2?5'C@46DD:?8
Chapter 4: Presets and Processing
+96#:?62C4@FDE:4)&=:E64@?E2:?D>F=E:A=6724E@CJAC@8C2>>65AC@46DD:?8AC6D6ED
E92E 92G6 366? 56G6=@A65 27E6C >2?J 9@FCD @7 =:DE6?:?8 2?5 6IA6C:>6?E:?8 FD:?8
9F?5C65D@7AC@8C2> D@FC46D24C@DD2==86?C6D7@CEF?:?8'C6D6E4C62E:@?:D2?@?8@:?8
AC@46DD2?5H6C68F=2C=J:>A=6>6?E?6HAC6D6ED32D65@?4FDE@>6C7665324<
,?=:<6@E96C#:?62C4@FDE:4AC@5F4EDE92E6>A=@J E96)&$/AC@46DD:?86?8:?6E96
4@?EC@=D@?E96)&=:E6 92G6 366?56=:36C2E6=J <6AEC2E96C D:>A=6 @H6G6CD6G6C2=
A2C2>6E6CD :?4=F5:?8 82E6 2?5 7C66K6 E9C6D9@=5D >F=E:32?5 56?D:EJ :?5:G:5F2=
32?5=6G6=DP?2=DE286=:>:E6C5C:G62?5>2DE6C@FEAFE2C625;FDE23=6
4.1 Description of Factory Presets
249 F?:E D9:ADH:E9 2 ?F>36C @7 AC6D6EDE92E 2C6 FD67F= 7@C >@DE D:EF2E:@?D 3C:67
56D4C:AE:@?@76249:DAC@G:56536=@H
L+-11%+9:D:DE96724E@CJ5672F=E2?5>@DE 4@>>@?=J 6>A=@J65AC6D6E
EAC@G:56D2>@56C2E6568C66@75J?2>:4C2?86AC@46DD:?82?5:DDF:E23=67@C2==
EJA6D@7 4@?E6?E +9:DAC6D6EH:== 56=:G6C 2F5:@ E92EH:== 92G62?2G6C2865:2=@8
=@F5?6DD@7#"*
L+-11# + -6CJ D:>:=2C E@ +-11% 3FE H:E9 2 =@H6C >F=E:32?5
4@>AC6DD:@? C2E:@ 7@C >@C6 86?E=6 24E:@? +9:D=:89E6C AC@46DD:?8 >2J C6DF=E :?
>@C6momentaryG2C:2E:@?7C@>E96=@F5?6DDE2C86E
L+-11-0 =D@ D:>:=2C E@ +-11% 3FE H:E9 2 9:896C >F=E:32?5
4@>AC6DD:@?C2E:@C6DF=E:?8:?:?4C62D6556?D:EJ2?5C65F4655J?2>:4C2?86
L+-11#&,*:>:=2CE@+-11-03FE=@F56C2?5>@C6AF?49J
�
L +,1#&,1# $ + ,E:=:K6D DA64:2==JEF?65 ?AFE D6EE:?8D E92E 2==@H E96
>F=E:32?52?5 P?2= =:>:E6CDE@ 4@?EC@= =6G6=D F?E:= E96 42E496DFA E@ 25;FDE
AC@8C2> =@F5?6DDE@28:G6?G2=F6+9:DAC6D6E:D>@C62AAC@AC:2E67@C :?86DE@C
=:G62AA=:42E:@?DE92?7@CEC2?D>:DD:@?2DE96$F=E:32?5 D64E:@?:D3JA2DD65
H9:49>2<6D:E=6DD23=6E@>2?86E96DA64EC2=32=2?46@7:?4@>:?82F5:@
L')&++ &% # $ + JA2DD6D 2== AC@46DD:?8 6I46AE 7@C E96 :?2= &FEAFE
#:>:E6CH9:49:DD6E@?=JE@AC6G6?E@G6C=@25
L*'&)+* $F=E:32?5 2EE24< 2?5 C6=62D6 G2=F6D 92G6 366? >@5:P65 7@C 2
D>@@E9 2?5 4@?D:DE6?E @FEAFE 7@C EJA:42= ?6EH@C< DA@CED AC@8C2>>:?8 +9:D
AC6D6E92D=6DDC2?867@C3@E9E96 ?AFE2?5$F=E:32?5D64E:@?D
L$,* 1-0 6?D6 AC@46DD:?8 >@DE DF:E23=6 7@C +- >FD:4 492??6=
2AA=:42E:@?D
#:?62C4@FDE:4)&=:E6'C6D6ED2?5'C@46DD:?8
L,*)')*+*)&=:E6 AC@G:56DC@@> 7@C 255:E:@?2= 4FDE@> FD6C
AC6D6ED
4.2 Processing Structure
6=@H:D25C2H:?8D9@H:?8E9686?6C2=D:8?2=A2E9@7E96)&=:E6AC@46DD:?84@C6
Figure 4.2)&=:E6'C@46DD:?8@C6
6CE2:?A2C2>6E6CDDF492D4C@DD@G6C 7C6BF6?4:6D2?532?54@FA=:?82C6?@E25;FDE23=6
2?52C6PI65E@ E96 >@DE2AAC@AC:2E6G2=F6D ?<66A:?8H:E9E96>@C6DEC2:89E7@CH2C5
2AAC@249@7E96 F?:ED@>6AC@46DD:?84@?EC@=D7@F?5:? @E96C #:?62C 4@FDE:4 AC@5F4ED
2C6?@E25;FDE23=6@?E96)&=:E6
$@G:?8 E96>6?F <?@35@H?EH@DE6AD7C@> E96'C6D6ED>6?FH:== 8:G6 J@F 2446DDE@
E96 25;FDE23=6 A2C2>6E6CD56D4C:365 36=@H '=62D6 D66 D64E:@? @7 92AE6C 7@C
>@C6:?7@C>2E:@?23@FE>6?F=2J@FE
4.3 Input AGC
+96:?AFE:D2G6CJ D=@H24E:?87C@?E6?582:?4@?EC@=H:E925C2?86H9@D6@?=J
AFCA@D6:DE@>2<6DFC6AC@46DD:?8DE286DE92E7@==@H :E2C6765H:E9E96AC@A6C 2G6C286
2F5:@ =6G6=D 6:?8 H:5632?5 :? ?2EFC6 E96 ?AFE :D?@E >62?E E@ A6C7@C> C2A:5
82:?C65F4E:@? @C 6IA2?D:@? H9:49 H@F=5 >2<6 :ED 24E:@?D>@C6 ?@E:4623=6 2DH:E92==
H:5632?582:?AC@46DD@CD D2D=@H 82:?C:56C:ED24E:@?D2C6?62C=J:?2F5:3=6E92?<D
E@ E96 >F=E:32?5 AC@46DD:?8 E92E 7@==@HD:E +96 ?AFE 92D EH@ DE286D @7 82E:?8
H9:49D=@HD@CDE@AD6IA2?D:@?E@AC6G6?E324<8C@F?5?@:D67C@>:?4C62D:?8
#:?62C4@FDE:4)&=:E6'C6D6ED2?5'C@46DD:?8
4.3.1 Gate Threshold
+9:DD6EDE96A@:?E 2E H9:49 E96 ?AFE C6=62D6 D=@HD 5@H? 3J 2 724E@C @7 E9C66 E@
AC6G6?E=@H=6G6=2F5:@@C324<8C@F?5?@:D67C@> :?4C62D:?8BF:4<=J2?52F5:3=JH9:=6
DE:== A6C>:EE:?8 E96 E@ C6EFC? E@ F?:EJ 82:? E :D 25;FDE23=6 36EH66? 5* 2?5
5*3J EFC?:?8E96>6?F<?@3+@2AA=J E96492?86@?2:C>@G6E96>6?F<?@3 E@
E96C:89E+965672F=ED6EE:?8G2C:6D7@C5:776C6?EAC6D6ED
4.3.2 Freeze Thresh(old)
+9:DD6EDE96A@:?E2EH9:49E96 ?AFE C6>2:?D7C@K6?2E:ED4FCC6?E 82:?G2=F6F?E:=
2F5:@6I4665:?8E9:DE9C6D9@=5:DAC6D6?E E:D�
25;FDE23=6 36EH66? 5* 2?5
5*:? E96 D2>6 >2??6C 2DE96 2E6+9C6D9@=5 +96 5672F=E G2C:6D7@C 5:776C6?E
AC6D6ED'C@8C2>>:?84@?E2:?:?87C6BF6?EA6C:@5DG6CJ BF:6E2F5:@8@=7>2E496D4@>6
E@ >:?5 H:== 36?6PE 7C@> 92G:?8 E96 ?AFE 7C66K6 2E 2 9:896C 4=@D6C E@ 5*
=6G6= +96?@:D6 7C@> E96 3=:>A @C 7C@> D@>6@?6 F?HC2AA:?8 2 >:?E@? E96 ?6IE 9@=6
D9@F=5?@E363C@F89EFAE@E96D2>6=6G6=2DE962??@F?46C
4.4 Multiband AGC
+9:DD64E:@? :D2EE96962CE@7E965J?2>:4DAC@46DD:?86?8:?62?52==@HDJ@FE@25;FDE
@G6C2== AC@8C2> 56?D:EJ 2?5 E96 6IE6?E E@ H9:49 E96)&=:E6 >2:?E2:?D E96 DA64EC2=
4@?D:DE6?4J@7E96D@FC46>2E6C:2=
4.4.1 Density
+96C2?86@7E9:D4@?EC@=:D6IAC6DD65:?C6=2E:G6?F>36CD36EH66?2?5.96?J@F
25;FDEE9656?D:EJ 4@?EC@=24@>3:?2E:@?@7492?86DE@E96$F=E:32?5 AC@46DD@C2C6
36:?8>256M369:?5E96D46?6DN:?4=F5:?825;FDE>6?EDE@E9C6D9@=5D2EE24<2?5C6=62D6
C2E6D2?5C2E:@D#@H6C?F>36CDC6DF=E:?>@C64@?D6CG2E:G65J?2>:4D6EE:?8DE92EDE2J
>@C6 ECF6 E@ E96 @C:8:?2= AC@8C2> 4@?E6?E H9:=6 9:896C ?F>36CD H:== AC@G:56 ME:89E6CN
5J?2>:4D2?5>@C6D@FC46E@D@FC46DA64EC2=4@?D:DE6?4J
4.5 Multiband Levels
+9:DD64E:@?4@?EC@=DE96@FEAFE@76249@7E9632?5D:?E96>F=E:32?5 D64E:@?2?5
42?36FD65E@E2:=@C E96@G6C2==7C6BF6?4J C6DA@?D6@7E96)&=:E624932?5
92D2C2?86@7
525;FDE23=6:? 5:?4C6>6?ED 642FD6E96D64@?EC@=D2C6
=@42E65 367@C6 E96 P?2= =@@<29625 =:>:E6C :?4C62D:?8 82:? >2J C6DF=E :? >@C6 P?2=
=:>:E:?8A6C92AD>@C6E92?56D:C65
7E6C >2<:?8 D:8?:P42?E 492?86D E@ E96D6 =6G6=D H6 C64@>>6?5 J@F C66I2>:?6 E96
P?2= =:>:E6C D6EE:?8D 2?5 25;FDE E96 &FEAFE #:>:E6C C:G6 4@?EC@= 56D4C:365 36=@H 2D
?66565
#:?62C4@FDE:4)&=:E6'C6D6ED2?5'C@46DD:?8
4.6 Final Stage
+96 P?2= D64E:@?@7 E96 AC@46DD@C :D H96C6 E96 P?2= A62< =:>:E6C 2?5 @FEAFE =6G6=D2C6
D6E+96P?2==:>:E6C:D@7E96H:5632?5=@@<29625G2C:6EJ6IEC6>6=J 72DE:??2EFC62?5
42A23=6@7FA E@5@782:?C65F4E:@? E:D2=D@G6CJ EC2?DA2C6?E2?5G:CEF2==J :?2F5:3=6
6G6?2E7F== 82:?C65F4E:@?2?556D:8?65E@4@?EC@=2F5:@A62<DE92E>2<6:EE9C@F89E96
AC6G:@FD>F=E:32?5DE286
4.6.1 Output Lim(iter) Drive
*6EDE96 =6G6= 2EH9:49 E96H:5632?5 DF> @72== 32?5D:D765 E@ E96 P?2= =:>:E6C @G6C 2
C2?86@755:?5:?4C6>6?ED
4.6.2 Master Output
*6EDE96@FEAFE=@F5?6DD=6G6= 7@C E964FCC6?EAC6D6E 7E96 +,#@F5?6DD$6E6C@AE:@?
:D?@EAC6D6?E 2?6IE6C?2=>6E6C DF492DE96 #:?62C4@FDE:4 #(@C #$ :D
C6BF:C65E@AC@A6C=JD6E=@F5?6DD=6G6=D
#:?62C4@FDE:4)&=:E6+C@F3=6D9@@E:?8
Chapter 5: Troubleshooting
The Linear Acoustic AERO.lite is a very stable and reliable unit, and most problems can
be traced back to mis-wiring causing incorrect signals to be applied to the unit, or, more
than likely, mis-configuration. As simple as this unit is to use once installed, it is very
flexible and thus a necessarily complex processor. In an effort to speed troubleshooting,
some common problems and solutions are described below.
5.1 Problems and Possible Causes
5.1.1 Unit Won’t Power On
At the risk of sounding like the start of a horribly long and cliche-ridden technical support
call, check the obvious and make sure the power cord or cords are plugged into a live
AC outlet (it happens).
The next thing to check is the power supply fuse. Remove the power cord and use a
small, flat-blade screwdriver to carefully remove the fuse holder from the IEC inlet
module. The holder carries a spare fuse and extras were included in the packing kit with
the unit. If the fuse is bad and continues to blow, please contact the factory.
5.1.2 Output Audio Clicks and Pops
The most likely culprit of clicks and pops is incorrect reference. The AERO.lite contains
sample rate converters that are active by default and allow digital audio signals of any
sample rate to be accepted. For installations in digital environments, the AERO.lite
digital outputs should slave to plant timing. This can be accomplished by ensuring that
proper reference is connected and selected: If using the AES outputs, reference should
be set to AES Input or AES Reference, or even SDI. For SDI, reference is automatically
set to SDI. Internal Reference should be reserved for asynchronous use, such as when
using only the analog outputs.
Note that clicks and pops can also originate upstream of the unit. Since AERO.lite will
add gain to the input signal, these noises may become more apparent.
5.1.3 Audio Pumps and Breathes
These artifacts are sometimes audible in less sophisticated processors or when the
attack and release times are not properly adjusted. The factory presets included with
the AERO.lite will not cause pumping or breathing. If you do detect these artifacts, it is
possible that audio is being processed somewhere in the plant by legacy gear that has
not been removed from the signal path. The AERO.lite performs best when it receives
unprocessed audio. If you are using a custom preset in lieu of a factory preset, closely
examine attack time, release time, and gating controls and adjust as necessary to avoid
these artifacts.
5.1.4 Problems with EAS Encoding
EAS encoding equipment should be located after any audio processor, including
AERO.lite. It is critical that processing be minimized for use with current EAS systems.
#:?62C4@FDE:4)&=:E6*A64:P42E:@?D
1*8;.9%8.,2C,*;276:
Table 6-1 Electrical Specifications
*2>A=6)2E6
<K
)6D@=FE:@?
3:E
C6BF6?4J)6DA@?D6
K<K36=@HAC@46DD:?8E9C6D9@=5D
'C@46DD:?86=2J
>D64*)&77>D64*)&?
'C@46DD:?8=8@C:E9>D
#:?62C4@FDE:4)&$/>F=E:DE286252AE:G6H:5632?5
2?5>F=E:32?5=@F5?6DD2?55J?2>:4C2?864@?EC@=
* &
FE@D6?D:?8
** *$'+$
$:?AFEDFAE@
:
KH:E92446DDE@2==2F5:@492??6=D
* &:?4=F5:?8*)67
&9>%76>2=64@??64E@CDH:E9&9>:?AFE
E6C>:?2E:@?C6=2J3JA2DD65E@@FEAFED:?42D6@7A@H6C=@DD
@C72F=ED:8?2==6G6=DA6C*$'+$
*
?2=@8 &
"&9>32=2?465/#)76>2=6DE6C6@:?AFED5F
?@>:?2=5F>2I2=2?465/#)>2=6DE6C6@@FEAFED
5F?@>:?2=5F>2I:?E@&9>D
625A9@?6&FEAFE
>>7C@?EA2?6=4@??64E@C5F>2I:?E@&9>D
'2C2==6=' &@?EC@='@CE
A:?76>2=64@??64E@C-++#=6G6=D
Ethernet Port
)!76>2=6;24<4@??64E@C
'@H6C)6BF:C6>6?ED
*E2?52C5:?E6C?2=DFAA=J-
K2FE@
D6?D:?8.>2I:>F>&AE:@?2=C65F?52?E324<FADFAA=J
-
C68F=2E65>2I:>F>G:2>>D62=65
=@4<:?84@??64E@Ccenter pin is positive!
Table 6-2 Mechanical Specifications
:>6?D:@?D
),96:89ENIN.INII>>
%6E.6:89E
=3D<8
*9:AA:?8.6:89E
=3D<82AAC@I:>2E6
#:?62C4@FDE:4)&=:E6*A64:P42E:@?D
Table 6-3 Environmental Specifications
&A6C2E:?8+6>A6C2EFC6
@?G64E:@?4@@=65568C66D568C66D
%@?&A6C2E:?8*E@C65
+6>A6C2EFC6
$:?FD568C66D$:?FD568C66D
)68F=2E@CJ
$#:>:ED
%@CE9>6C:426D:8?65E@4@>A=JH:E9H:E9=:>:ED7@C2
=2DD5:8:E2=56G:46AFCDF2?EE@'2CE@7E96CF=6D
)6D:8?657@C,*2?52?25:2?=:DE:?8H:E9,#
FC@A66D:8?65E@4@>A=JH:E9E96C6BF:C6>6?ED@7#@H
-@=E286:C64E:G6
2?5$:C64E:G6
6D:8?657@C)@*2?5.4@>A=:2?46
Table 6-4 GPI/O Parallel Control Port
Pin
@??64E:@?
' ' ' ' C@F?5
@>>@?
'&
'&
8
'&
'&