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Linear Acoustic L.A.M.B.D.A.-II User Manual

Digital audio and metadata monitor
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L.A.M.B.D.A.-II
Digital Audio and Metadata Monitor
User Guide

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Summary of Contents for Linear Acoustic L.A.M.B.D.A.-II

  • Page 1 L.A.M.B.D.A.-II Digital Audio and Metadata Monitor User Guide...
  • Page 3 L.A.M.B.D.A.-II Digital Audio and Metadata Monitor User Guide Release Date: March, 2010 Software Version: 00.00.96 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. Linear Acoustic, the “LA” symbol, L.A.M.B.D.A., AutoNorm, MetaMAX, AutoMAX, CrowdControl, upMAX, AEROMAX TV, AEROMAX DTV, and AEROMAX 5.1, AERO.air, AERO.qc, and...

  • Page 5: Table Of Contents

    Linear Acoustic LAMBDA-II Audio Monitor User Guide Table of Contents List of Figures ............................vii Chapter 1: Introduction ........................5 Principles of Operation..................6 Location ........................6 Upgrades ........................7 Warranty and Feedback ..................7 Chapter 2: Connections and Quick Setup ...............9 Unpacking and Inspection ..................9 Installation .......................9...
  • Page 6 Linear Acoustic LAMBDA-II Audio Monitor User Guide Chapter 5: Specifications ......................27 Chapter 6: Troubleshooting .......................31 Unit won’t power on ....................31 Output Audio Clicks and Pops................31 Meters Present, No Audio Reproduced............32...

  • Page 7: List Of Figures

    Linear Acoustic LAMBDA-II Audio Monitor User Guide List of Figures Audio Block Diagram .........................6 LAMBDA Rear Panel ........................10...
  • Page 8 Linear Acoustic LAMBDA-II Audio Monitor User Guide viii...

  • Page 9: Chapter 1: Introduction

    Linear Acoustic LAMBDA-II Audio Monitor User Guide Chapter 1: Introduction The second generation Linear Acoustic Monitor for Broadcast Digital Audio and metadata (LAMBDA) has been designed to enable fast and easy evaluation of complex multi-chan- nel audio and metadata signals. The unit has the following features: •...

  • Page 10: Principles Of Operation

    ITU loudness, and internal decoding of popular compressed audio formats such as Dolby E, Dolby Digital (AC-3), and Linear Acoustic e-squared. Sixteen baseband or compressed audio inputs are available via discrete AES3-ID (BNC) connectors, or by de- embedding from an applied HD-SDI signal.

  • Page 11: Upgrades

    Linear Acoustic LAMBDA-II Audio Monitor User Guide Introduction scaled for specific applications. Upgrades Updates to the functionality of the LAMBDA unit will be installed via Ethernet and a pro- vided update package. Customers are encouraged to fill out and mail the warranty registra- tion card to enable timely notifications of updates and feature additions.
  • Page 12 Linear Acoustic LAMBDA-II Audio Monitor User Guide Introduction...

  • Page 13: Chapter 2: Connections And Quick Setup

    • Spare fuses; • this manual • 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 LAMBDA installation requires: • two standard rack space units with ADEQUATE VENTILATION;...

  • Page 14: Rear Panel

    Linear Acoustic LAMBDA-II Audio Monitor User Guide Connections and Quick Setup Rear Panel The rear panel of the LAMBDA contains its electrical I/O. 2.3.1 Connection Ports All of the electrical I/O of the LAMBDA unit, with the exception of the front panel head- phone connector, is located on the rear panel.

  • Page 15: Quick Setup Notes

    Linear Acoustic LAMBDA-II Audio Monitor User Guide Connections and Quick Setup Quick Setup Notes The LAMBDA audio monitor is very straightforward to use and configure. Spending just a few minutes with this manual and the unit will allow quick mastering of settings and con- trols.
  • Page 16 Linear Acoustic LAMBDA-II Audio Monitor User Guide Connections and Quick Setup...

  • Page 17: Chapter 3: Application Notes

    Linear Acoustic LAMBDA-II Audio Monitor User Guide Chapter 3: Application Notes The Linear Acoustic L.A.M.B.D.A. monitor can be thought of as a multi-format audio and metadata router followed by optional decoding, with outputs in the form of powered speakers, headphones, and baseband PCM. Metadata must be carefully checked prior to the final encoding process and this monitor also provides this necessary functionality.

  • Page 18: Monitoring In 16-Channel Mode

    Linear Acoustic LAMBDA-II Audio Monitor User Guide Application Notes Speaker Mute Input Mode BNC Inputs Program Monitor Ch Channel Assignment Assignment Level In addition to allowing simple grouping of audio channels, setting programs also deter- mines how audio channels are presented to the downmixer and the ITU loudness meter.
  • Page 19 Linear Acoustic LAMBDA-II Audio Monitor User Guide Application Notes Speaker Mute Input Mode BNC Inputs Fixed program Channel and monitor Level assignments The outputs of the decoded signal (audio and metadata) are automatically mapped to the proper monitor channels. In the case of a Dolby Digital (AC-3) signal, a single program is created.
  • Page 20 Linear Acoustic LAMBDA-II Audio Monitor User Guide Application Notes...

  • Page 21: Chapter 4: Detailed Operation

    Left and right advance through the menus, while up and down advance through settings within a menu. As with other Linear Acoustic products, when making a change that can be saved, an asterisk (*) will appear next to the changed value. To save it, press the Right or “Next”...
  • Page 22 Linear Acoustic LAMBDA-II Audio Monitor User Guide Detailed Operation Function Keys Four direct function keys are provided: • Solo Left - Mutes the right speaker to solo audio being sent to the left speaker. Also used in PCM-16 mode when not in downmix (no light above the Downmix key) to select the channel to be reproduced by the Left speaker.
  • Page 23 Linear Acoustic LAMBDA-II Audio Monitor User Guide Detailed Operation...

  • Page 24: Detailed Menu Functions And Setup

    4.2.1 Menu Settings As with other Linear Acoustic products, the menus are structured so that top level menus provide current system status information, while setup is performed by accessing lower level menus. In other words, the deeper you navigate, the more detailed the status and set- up information becomes.
  • Page 25 Monitor Channels Metadata - Displays metadata information from any of three sources: Serial RS485, VANC from HD-SDI, or from an installed Dolby or Linear Acoustic decoder module. Signal Status - Shows summary of audio and metadata configuration and presence. Statistics - Shows current installed firmware, options, and receive CRC errors for AES and metadata signals.
  • Page 26 Linear Acoustic LAMBDA-II Audio Monitor User Guide Detailed Operation LAMBDA Setup: Presets • User Preset - Up to sixteen presets can be stored and recalled and this menu al- lows selection of the current preset for editing. • Source Mode - Selects the type of input signals that will drive the rest of the unit: •...
  • Page 27 Linear Acoustic LAMBDA-II Audio Monitor User Guide Detailed Operation Speaker Mute Input Mode BNC Inputs Program Monitor Ch Channel Assignment Assignment Level NOTE: In PCM-16 via BNC or PCM-16 via SDI audio signals are mapped as applied to inputs. Front panel Solo and Downmix controls allow simple and quick se- lection of specific channels or groups for monitoring.
  • Page 28 Linear Acoustic LAMBDA-II Audio Monitor User Guide Detailed Operation LAMBDA Setup: I/O This menu allows for general configuration of input and output signals. These settings are normally adjusted during installation and will normally not need to be changed. • Master Bypass - Bypasses all audio, SDI, and metadata signals from input to out- put via relays.
  • Page 29 Linear Acoustic LAMBDA-II Audio Monitor User Guide Detailed Operation NOTE: Delay is only applied to the Monitor, headphone and speaker outputs, it is NOT applied to the Main AES outputs. • Downmix Type - Choose between a stereo LoRo or surround compatible LtRt downmix.
  • Page 30 Linear Acoustic LAMBDA-II Audio Monitor User Guide Detailed Operation • GPO X On Delay - Adjusts how long to wait before triggering the GPO. Default is 0 seconds, adjustable to 20 seconds. As an example, if set to 0 seconds, any event that would trigger GPO will do so instantly.

  • Page 31: Chapter 5: Specifications

    Linear Acoustic LAMBDA-II Audio Monitor User Guide Chapter 5: Specifications Table 5-1 Electrical Specifications Sampling Rate 48 kHz (±0.1%) PCM: >6 msec; Dolby E: 33/40 msec (NTSC/PAL); Output Delay Dolby Digital (AC-3): 32 msec; Delay can be padded up to an additional 100 msec.
  • Page 32 Linear Acoustic LAMBDA-II Audio Monitor User Guide Specifications Table 5-2 Mechanical Specifications Dimensions 3.5 × 19 × 15 in (89 × 483 × 381mm) Net Weight 10 lb (4.54 kg) approx. Shipping Weight 12 lb (5.44 kg) approx. Power Requirements 100-240 VAC, autoranging, 50–60 Hz...
  • Page 33 Linear Acoustic LAMBDA-II Audio Monitor User Guide Specifications Metadata Input/Output Port 9-pin female D-connector with full-duplex RS-485 protocol running at 115 kbps. Pinout is compatible with SMPTE 207M. Pin-for-pin compatible with Dolby metadata sources (i.e. straight-through cable should be used.
  • Page 34 Linear Acoustic LAMBDA-II Audio Monitor User Guide Specifications Ethernet Port The Ethernet port is a standard RJ-45 female connector that supports 10 or 100BASE-T. ITU Loudness Meter Implemented per ITU BS.1770 with an adjustable 3 second to 10 second integration time.

  • Page 35: Chapter 6: Troubleshooting

    Linear Acoustic LAMBDA-II Audio Monitor User Guide Chapter 6: Troubleshooting The Linear Acoustic LAMBDA monitor is designed for years of trouble-free operation, but as with any sophisticated audio gear, there may be circumstances where some guidance would be helpful. Some practical issues and solutions are presented below.

  • Page 36: Meters Present, No Audio Reproduced

    Linear Acoustic LAMBDA-II Audio Monitor User Guide Troubleshooting Meters Present, No Audio Reproduced The most obvious reason for this would be that the unit is muted, as indicated by a “re- verse-video M” in the top right corner of the display. If the unit is not muted, ensure that the volume control is turned up to a nominal level (such as -20dB).

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