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Linear Acoustic AERO.mobile User Manual

Mobile audio/loudness manager
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AERO.mobile
Mobile Audio/Loudness Manager
User Guide

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  • Page 1 AERO.mobile Mobile Audio/Loudness Manager User Guide...
  • Page 3 AERO.mobile Mobile Audio/Loudness Manager User Guide Release Date: November, 2010 Software Version: 0.1.13 and later Linear Acoustic Inc. Phone: 717-735-3611 FAX: 717-735-3612 Web: www.LinearAcoustic.com...

  • Page 4: Warranty Information

    Linear Acoustic or its agents have been advised, orally or in writing, of the possibility of such damages. This product contains Audyne dynamic range processing and is manufactured under license.

  • Page 5: Table Of Contents

    Linear Acoustic AERO.mobile User Guide Table of Contents List of Figures ............................vii Chapter 1: Introduction ........................5 Principles of Operation..................5 Location of AERO.mobile..................6 Reference Levels .....................8 Reset and Upgrades ....................8 Warranty and Feedback ..................8 Chapter 2: Connections and Quick Setup ...............9 Unpacking and Inspection ..................9...
  • Page 6 Linear Acoustic AERO.mobile User Guide 4.4.6 Clock Source (Output Reference)............25 4.4.7 Input Sources (Channels 1-8) .............25 4.4.8 SDI Embed ...................25 4.4.9 SDI Out Destination (Channels 1-16) ..........25 4.4.10 Metadata Setup ..................25 4.4.11 Ch 7/8 Out Src..................26 4.4.12 ALT Mode.....................27 4.4.13 Downmix Ch Mode ................27...

  • Page 7: List Of Figures

    List of Figures Basic Audio Block Diagram .......................6 Installation of AERO.mobile for Mobile DTV programming .............7 Installation of AERO.mobile and AERO.air for main DTV programming......7 Rear Panel ............................10 MB Type set to Downmix (no Mobilizer) ..................13 MB Type set to MB1 (one Mobilizer engine) ................14 MB Type set to MB1&MB2 (Stereo) ....................15...
  • Page 8 Linear Acoustic AERO.mobile User Guide viii...

  • Page 9: Chapter 1: Introduction

    Specific processing presets and adjustments are discussed in Chapter 5. Figure 1-1 shows the internal audio path of the AERO.mobile. It should be noted that this diagram is a general representation of signal flow and shows the optional Dolby Pulse (HE AAC) encoder.

  • Page 10: Location Of Aero.mobile

    Since AERO.mobile accepts baseband audio and outputs a signal for encoding, a good installa- tion point would be very close to the Mobile DTV encoder as shown below in Figure 1-2.

  • Page 11: Installation Of Aero.mobile For Mobile Dtv Programming

    Mobile Program(s) (SDI) Figure 1-2 Installation of AERO.mobile for Mobile DTV programming If the station already has a Linear Acoustic AERO.air or AERO.mobile as shown below in Figure 1-3, it can be installed near this unit. Encoding, Multiplexing and Modulation ATSC DTV (A/53): AERO.air...

  • Page 12: Reference Levels

    Linear Acoustic AERO.mobile User Guide Introduction Reference Levels The AERO.mobile is designed to support a standard reference level of -20dBFS. Other levels can be supported as the slow-moving Input AGC will easily compensate for any level differences. Please see Chapter 4 for detailed information.

  • Page 13: Chapter 2: Connections And Quick Setup

    IEC power cord(s) (style matches country of order); • this manual, and a handy black pen. • Warranty information: Please fill out and return the warranty card to Linear Acoustic to ensure your software and documentation are kept up to date. Installation AERO.mobile installation requires: •...

  • Page 14: Rear Panel

    The rear panel of the AERO.mobile contains its electrical I/O. 2.3.1 Connection Ports All of the connections for AERO.mobile are on the rear panel and are described in detail below. See Chapter 5: Specifications for specific pinouts. Figure 2-1 Rear Panel •...

  • Page 15: Quick Setup Notes

    7/8 = utility duplicate of 5/6. Quick Setup Notes The Linear Acoustic AERO.mobile is configured at the factory and is ready to go on the air after making the proper input and output connections and determining if upmixing is desired. By default, the unit is set to accept 5.1 channel input and downmix it, apply a single Mobilizer (MB) engine, and have a second ALT input available for use.
  • Page 16 Linear Acoustic AERO.mobile User Guide Connections and Quick Setup it will be processed and output from 7/8 with a duplicate on 5/6. • When MB Type = None or MB1 (single MB engine) and the Ch 7/8 Output Source menu is set to Downmix, then the main program on 1/2 and 53/4 will also be output from 5/6 and 7/8.

  • Page 17: Mb Type Set To Downmix (No Mobilizer)

    Linear Acoustic AERO.mobile User Guide Connections and Quick Setup “SDI Out Dest” “Input Source” SDI Out HD/SD-SDI HD-SDI SDI In (HD/SD) Demux (HD/SD) 48kHz “Clock Source” “Presets” “Downmix” Main Int. (AES 1/2) Aeromax Input 1/2 Main 24-bit Loudness/DRC 2.0 (#1)

  • Page 18: Mb Type Set To Mb1 (One Mobilizer Engine)

    Linear Acoustic AERO.mobile User Guide Connections and Quick Setup “SDI Out Dest” “Input Source” SDI Out HD/SD-SDI HD-SDI SDI In (HD/SD) Demux (HD/SD) 48kHz “Clock Source” “Presets” “Downmix” “MB” Main Int. (AES 1/2) Aeromax Input 1/2 Main Mobilizer 24-bit Loudness/DRC 2.0 (#1)

  • Page 19: Mb Type Set To Mb1&Mb2 (Stereo)

    Linear Acoustic AERO.mobile User Guide Connections and Quick Setup “SDI Out Dest” “Input Source” SDI Out HD/SD-SDI HD-SDI SDI In (HD/SD) Demux (HD/SD) 48kHz “Clock Source” “Presets” “MB” Main Int. (AES 1/2) Aeromax Input 1/2 Main Mobilizer 24-bit Loudness/DRC 2.0 (#1)
  • Page 20 Linear Acoustic AERO.mobile User Guide Connections and Quick Setup NOTE: For best audio quality, the AERO.mobile should be the only processor in line with station audio. Please make sure to remove any legacy processing that might have been installed as it will impair the performance capabilities of the AERO.mobile.

  • Page 21: Chapter 3: Applications

    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.

  • Page 22: Standard Plus Mobile Application

    Standard plus Mobile Application Figure 3-2 shows how an AERO.mobile can be installed alongside a new or existing AERO.air or AERO.one main channel audio processor. Since it is likely that the video en- coders for both the mobile and the standard DTV channels will be located near each other,...

  • Page 23: Aero.mobile For Mobile Dtv And Aero.air For Standard Dtv

    Note that it is possible to consider feeding both sources from an SDI distribution amplifier and the AERO.air will provide 5.1 channel audio and Dolby Digital encoding for the pri- mary DTV services, while the AERO.mobile will take the same source audio and create a version appropriate for Mobile DTV transmission.
  • Page 24 Linear Acoustic AERO.mobile User Guide Applications This Page Is Not Blank (but is useful for notes)

  • Page 25: Chapter 4: Detailed Operation

    The next two menus show output and ALT status with channel labels. Note that for AERO.mobile, the 5.1 channel input (L,R,C,S,Ls,Rs) is the input to the downmixer and is only active when the Mobilizer type is Downmix (No MB) or MB1 and is not active in...

  • Page 26: Audio Signal Presence And Upmix Indication

    Linear Acoustic AERO.mobile User Guide Detailed Operation I n p u t O u tp u t A L T L t R t L R C S L s R s L R Figure 4-2 Audio signal presence and upmix indication AGC Meters Show the gain reduction status of the Input AGC and the Multiband AGC.

  • Page 27: Statistics Menu

    Linear Acoustic AERO.mobile User Guide Detailed Operation Statistics Menu Provides details about software, firmware and DSP versions, DSP communications status, as well as listing any installed options. This menu also shows the presence for each of the AES pairs, 1-8.

  • Page 28: Gpi Control (Flashing "G")

    Downmix Setup: • Type: LtRt/LoRo - The AERO.mobile is able to create an LoRo or LtRt output from an applied 5.1 channel signal for output on 1/2. Note that due to the required phase encoding, selection of LtRt will increase the latency of the 7/8 output to 21 millisec- onds.

  • Page 29: Clock Source (Output Reference)

    Note that if a selection is made for a source that is not applied, the front panel Ref LED will be red, and the AERO.mobile will revert to internal 48kHz to maintain audio. All inputs have sample rate converters so asynchronous audio can be ac- cepted as long as the reference is set correctly.

  • Page 30: 4.4.11 Ch 7/8 Out Src

    If dialnorm was set cor- rectly upstream, then the processing will be minimal. If dialnorm does not match the audio, the AERO.mobile will realign it in real time. Default is Do Not Apply. 4.4.11 Ch 7/8 Out Src Selects the function of each GPI input.

  • Page 31: 4.4.12 Alt Mode

    Linear Acoustic AERO.mobile User Guide Detailed Operation 4.4.12 ALT Mode Selects mode of the Main In 7/8 between stereo and three mono modes. Selections are: • Stereo: Channel 7/8 are passed without modification • Mono: Channel 7 and 8 are summed and passed as dual mono •...
  • Page 32 Linear Acoustic AERO.mobile User Guide Detailed Operation - NOTES -...
  • Page 33 Linear Acoustic AERO.mobile User Guide Detailed Operation...
  • Page 34 Linear Acoustic AERO.mobile User Guide Detailed Operation...

  • Page 35: Chapter 5: Presets And Processing

    • MOBI 5B GEN - This is the default preset for the AERO.mobile. It provides a mod- erate degree of dynamic range processing, and is appropriate for all types of content. Use of this preset is highly recommended as a starting point as it has been tuned to work with the preceding Mobilizer stage (see below).

  • Page 36: Processing Structure

    *P re s e n t o n ly © 2 0 1 0 L in e a r A c o u s tic In c . fo r M a in In 1 -6 Figure 5-1 General signal flow of the AERO.mobile processing core...

  • Page 37: Adjusting Processing

    Figure 5-2 Adjust Processing Menus But first... A Word on Our Crossovers The multiband crossovers in the AERO.mobile consist of second order Linkwitz Reilly style filters that are hard coded to specific frequencies. As the processing required for tele- vision applications is not as aggressive as other mediums, little advantage can be gained from changing these values, and the remainder of the processing relies on these character- istics remaining constant.
  • Page 38 Linear Acoustic AERO.mobile User Guide Presets and Processing Parametric Eq(ualization) Three bands of parametric equalization are provided for fine tuning if necessary. None of the factory-supplied presets use the parametric equalizers, but they are provided to create notch filters or other effects if necessary. Each filter has a gain control with a +/-12dB range, a center frequency control that varies from 20 Hz to 22.050 kHz, and a bandwidth...
  • Page 39 Linear Acoustic AERO.mobile User Guide Presets and Processing is reflected in real time by changing the AGC meter scale. • Threshold: -18dBFS - 0dBFS • Attack: 0 - 150, slowest - fastest • Release: 0 - 150, slowest - fastest •...
  • Page 40 Linear Acoustic AERO.mobile User Guide Presets and Processing • B1 - B5 AGC Release: 0 - 150, slowest - fastest -How fast an input signal recovers from a gain change once that signal falls be- low the set threshold. • B1 - B5 AGC Thresh(old): -12.00dB - +12.00dB -The reference point for the attack and release parameters to act on the audio signal present in that band.
  • Page 41 This is useful as more aggressive pre- sets will measure differently from less aggressive versions. NOTE: With MOBI 5B GEN selected and normal dialog-based programming applied, loudness will measure approximately -24dBLKFS using a Linear Acoustic LAMBDA audio monitor or LQ-1000 Loudness Quality Meter.

  • Page 42: Aero.mobile Factory Presets

    Linear Acoustic AERO.mobile User Guide Presets and Processing Mobi 5B Gen Mobi 5B Light Mobi 5B Heavy Mobi 5B Sports ITU_Loud_Limit Protection_Limt Input AGC Gate Threshold -21 dB -21 dB -21 dB -11 dB -15 dB -21 dB Freeze Thresh...

  • Page 43: Linear Acoustic Mobilizer Settings

    This is exactly what traditional wideband, single band or multiband audio pro- cessors do. In fact, it is also what the processing section of other Linear Acoustic AERO processors do.
  • Page 44 Linear Acoustic AERO.mobile User Guide Presets and Processing Inverse Frequency Compensation This control provides equalization to help audio stand out from mobile devices. Default Setting: 75 Max Surr Reduction Threshold Sets the threshold for a limiter that constrains the amount of non-phase coherent audio (like crowd swells) from overwhelming the phase coherent sounds (like dialogue).

  • Page 45: Chapter 6: Troubleshooting

    Linear Acoustic AERO.mobile User Guide Chapter 6: Troubleshooting The Linear Acoustic AERO.mobile 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 the unit is to use once installed, it is very flexible and thus a necessarily complex processor.

  • Page 46: Output Audio Clicks And Pops

    Set correctly, this will prevent background noise being increased unneces- sarily during quiet scenes. 6.1.6 Problems with EAS decoding It is important to locate EAS encoding equipment after any audio processing, including AERO.mobile. It is critical that processing be minimized for use with current EAS sys- tems.

  • Page 47: Chapter 7: Specifications

    Table 7-1 Electrical Specifications Sampling Rate 48 kHz (0.1%) 16 msec minimum Processing Delay Linear Acoustic Mobilizer audio processing plus AEROMAX Processing Algorithms loudness and DRC engine and ITU LoRo and LtRt downmix Audio Word Length 24-bit performance, processing in bypass...
  • Page 48 Linear Acoustic AERO.mobile User Guide Specifications Table 7-3 Environmental Specifications Operating Temperature C to 50 Non Operating Temperature C to +70 – (Storage) Humidity Up to 98% relative humidity, non-condensing EMC Radiation Limits FCC Part 15 Class A, ICES-003 Metadata Input Port 9-pin female D-connector with full-duplex RS-485 protocol running at 115 kbps.
  • Page 49 Linear Acoustic AERO.mobile User Guide Specifications GPI/O Parallel Control Port TTL level controls, active Low. The 5-V output for external GPO indicators is limited by a self-resetting fuse. Table 7-5 GPI/O Port Pinout Connection GPI 1 GPI 2 GPI 3...
  • Page 50 Linear Acoustic AERO.mobile User Guide Specifications This page is not blank...

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