Linear Acoustic LA-5269 User Manual
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Linear Acoustic LA-5269 User Manual

Dolby digital / plus transcoder
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Dolby
Digital/Plus Transcoder
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Model LA-5269
User Guide

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  • Page 1 Dolby Digital/Plus Transcoder ® Model LA-5269 User Guide...
  • Page 3 Dolby Digital/Plus Transcoder ® Model LA-5269 User Guide Release Date: March, 2011 Software Version: V0.0.15 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 optionally contains Dolby Digital (AC-3) encoding and is manufactured under license from Dolby Laboratories, Inc.

  • Page 5: List Of Figures

    Linear Acoustic LA-5269 Transcoder User Guide List of Figures Audio Block Diagram .........................6 Rear Panel ............................10 LA-5269 Connection Example ......................13 A/V Sync Timing ..........................14...
  • Page 6 Linear Acoustic LA-5269 Transcoder User Guide...

  • Page 7: Table Of Contents

    Linear Acoustic LA-5269 Transcoder User Guide Table of Contents List of Figures ............................v Chapter 1: Introduction ........................5 Principles of Operation..................5 Location of LA-5269....................6 Reference Levels .....................6 Reset and Upgrades ....................6 Warranty and Feedback ..................7 Chapter 2: Connections and Quick Setup ...............9...
  • Page 8 Linear Acoustic LA-5269 Transcoder User Guide 4.3.6 Metadata Setup ..................25 AC-3 Encoder Menu....................26 4.4.1 AES Channel Status Bits..............26 4.4.2 Transcoder.....................26 4.4.3 Encoder Mode & Metadata ..............26 Communication Menu ..................29 4.5.1 IP Address & Subnet ................29 4.5.2 SNMP Trap Addresses................29 System Menu ......................30 SDI Status Menu....................30...

  • Page 9: Chapter 1: Introduction

    Metadata translation between codecs Principles of Operation Figure 1-1 shows the internal audio path of the LA-5269. It should be noted that this dia- gram is a general representation of signal flow. Please consult the appropriate section of this manual for specific functionality.

  • Page 10: Location Of La-5269

    LA-5269 near the MPEG video encoder and/or multiplexer as the units work closely together and will benefit from short cable runs and common clocking. Reference Levels The LA-5269 is designed to support a standard reference level of -20dBFS via its digital inputs. Reset and Upgrades A soft re-boot of the unit can be accomplished by briefly and simultaneously pressing the Left, Up, and Right arrow keys.

  • Page 11: Warranty And Feedback

    Linear Acoustic LA-5269 Transcoder User Guide Introduction Upgrades are performed via the rear-panel Ethernet connector. The USB connector is un- used, however please do not insert any device into this connector. Warranty and Feedback Please take a moment to fill out and return the warranty card included with the unit. This will enable us to contact you if there are any software or documentation issues.
  • Page 12 Linear Acoustic LA-5269 Transcoder User Guide Introduction...

  • Page 13: Chapter 2: Connections And Quick Setup

    Two IEC power cords (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 LA-5269 installation requires: •...

  • Page 14: Rear Panel

    The rear panel of the LA-5269 contains its electrical I/O. 2.3.1 Connection Ports All of the connections for LA-5269 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

    Encoder B Output: AC-3 output of the 2.0 channel Dolby Digital encoder option Quick Setup Notes The Linear Acoustic LA-5269 is configured at the factory and is ready to go on the air after making the proper input and output connections.
  • Page 16 Linear Acoustic LA-5269 Transcoder User Guide Connections and Quick Setup...

  • Page 17: Chapter 3: Applications

    Linear Acoustic LA-5269 Transcoder User Guide Chapter 3: Applications The LA-5269 is essentially a modern updated version of the classic Dolby DP569. Features such as dual power supply, HD/SD-SDI I/O, and SNMP have been added to a Dolby- manufactured encoder card. Support for encoding from PCM inputs is provided along...

  • Page 18: Latency

    When installing an external audio encoder such as the LA-5269, the latency im- posed by the audio coding process can be “tuned out” of the MPEG multiplexer by re- moving some of the compensating delay.

  • Page 19: Snmp (Option)

    The current LA-5269 MIB file is copied below. Note that this data can be copied and past- ed to a text file that can be re-named LINEAR-ACOUSTIC-LA5269.mib and used by an SNMP manager.
  • Page 20 Linear Acoustic LA-5269 Transcoder User Guide Applications SYNTAX OCTET STRING (SIZE (0..40)) ACCESS read-only STATUS mandatory DESCRIPTION "Linear Acoustic Model." ::= { la5269-system 1 } -- software version software-version OBJECT-TYPE SYNTAX OCTET STRING (SIZE (0..40)) ACCESS read-only STATUS optional DESCRIPTION "Device's software version."...
  • Page 21 Linear Acoustic LA-5269 Transcoder User Guide Applications -- 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 } ::= { la5269-status 1 } -- Power Supply 2...
  • Page 22 Linear Acoustic LA-5269 Transcoder User Guide Applications DESCRIPTION "Status of Master Bypass." DEFVAL { 1 } ::= { la5269-status 3 } -- System Reference system-reference OBJECT-TYPE SYNTAX INTEGER {absent (1), present (2)} ACCESS read-only STATUS optional DESCRIPTION "Status of System Reference."...
  • Page 23 Linear Acoustic LA-5269 Transcoder User Guide Applications SYNTAX INTEGER {absent (1), present (2)} ACCESS read-only STATUS optional DESCRIPTION "Metadata Presence status." DEFVAL { 1 } ::= { la5269-status 6 } -- Encoder/Decoder codec OBJECT-TYPE SYNTAX INTEGER {error (1), ok (2)}...
  • Page 24 Linear Acoustic LA-5269 Transcoder User Guide Applications -- 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.
  • Page 25 Linear Acoustic LA-5269 Transcoder User Guide Applications -- Codec failed trap-codec-failed TRAP-TYPE ENTERPRISE la5269 DESCRIPTION "Trap, Encoder/Decoder failed or not detected." ::= 12 -- Metadata Loss trap-metadata-loss TRAP-TYPE ENTERPRISE la5269 DESCRIPTION "Trap, Metadata lost or not detected." ::= 13 -- Metadata Reverted...
  • Page 26 Linear Acoustic LA-5269 Transcoder User Guide Applications...

  • Page 27: Chapter 4: Detailed Operation

    Linear Acoustic LA-5269 Transcoder User Guide Chapter 4: Detailed Operation This chapter discusses in detail the structure of the Linear Acoustic LA-5269, how to use the front panel interface to access the menus, accessing and saving factory and user pro- cessing presets, and GPI and Metadata setup.

  • Page 28: I/O Menu

    Note that if a selection is made for a source that is not applied, the front panel Ref LED will be red, and the LA-5269 will revert to internal 48kHz to maintain audio. All inputs have sample rate converters on them so asynchronous audio can be accepted as long...

  • Page 29: Audio Input Sources (Channels 1-8)

    4.3.4 SDI Embed Selects whether to enable audio re-embedding or pass the SDI signal through the LA-5269 untouched. Note this does not affect de-embedding which is active at all times. See note above about Clock Reference when SDI Embed is enabled.

  • Page 30: Ac-3 Encoder Menu

    Linear Acoustic LA-5269 Transcoder User Guide Detailed Operation SMPTE RP2020 recommends that metadata be inserted on Line 9, but we have seen a great deal of variation, thus the default is Auto. AC-3 Encoder Menu The Dolby Digital encoder option provides two encoders, the first capable of encoding up to 5.1 channels and the second capable of up to two channels.
  • Page 31 Lgt. for minimal DRC action. • Dialnorm EnA: Using an ITU loudness meter (Linear Acoustic LAMBDA, LQ-1000 or equivalent), set the transmitted dialnorm value here. Note that the factory default preset of TV 5B Gen is pre-adjusted to produce -24 on average with typical program audio inputs so the default setting is -24.
  • Page 32 Linear Acoustic LA-5269 Transcoder User Guide Detailed Operation NOTE: To correctly set dialnorm, the loudness of the output audio must be verified us- ing an ITU-R BS.1770 loudness meter. For compliance, any value between -1 and -31 could be valid, as long as it matches the actual measured audio. De- fault is -24.

  • Page 33: Communication Menu

    4.5.1 IP Address & Subnet Enter a valid IP address and subnet for connecting the LA-5269 to the network. 4.5.2 SNMP Trap Addresses Two trap IP addresses can be set and any messages will be relayed to both.

  • Page 34: System Menu

    Linear Acoustic LA-5269 Transcoder User Guide Detailed Operation System Menu Allows reset to factory defaults. Note that IP settings, Presets, and I/O can be reset indi- vidually or “All” can be chosen to be reset simultaneously. SDI Status Menu Pressing the left arrow key when at the top menu will display the status of an applied SDI signal.
  • Page 35 Linear Acoustic LA-5269 Transcoder User Guide Detailed Operation...
  • Page 36 Linear Acoustic LA-5269 Transcoder User Guide Detailed Operation...

  • Page 37: Chapter 5: Troubleshooting

    Linear Acoustic LA-5269 Transcoder User Guide Chapter 5: Troubleshooting The Linear Acoustic LA-5269 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.

  • Page 38: Output Audio Clicks And Pops

    It could also mean that audio applied to the unit is not properly referenced, or that the equipment that the LA-5269 is feeding is not properly referenced. Using the master bypass function of the unit is a helpful way to troubleshoot this issue.

  • Page 39: Chapter 6: Specifications

    Linear Acoustic LA-5269 Transcoder User Guide Chapter 6: Specifications Table 6-1 Electrical Specifications Sampling Rate 48 kHz (0.1%) Coding Delay See Table 6-2 below. Audio Word Length 24-bit performance Metadata Input/Output RS-485, 9-pin female D-connector on rear panel GPIO Port...
  • Page 40 Linear Acoustic LA-5269 Transcoder User Guide Specifications Table 6-2 Audio Coding Specifications -Dolby Digital (AC-3) Encode from PCM or Dolby E -Dolby Digital Plus (E-AC-3) Encode for PCM or Dolby E and Transcode from Dolby Digital (AC-3 to E-AC-3) Audio Codecs...

  • Page 41: Ethernet Port

    Linear Acoustic LA-5269 Transcoder User Guide Specifications Metadata Input 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. Table 6-5 Metadata I/O Port Pinout...
  • Page 42 Linear Acoustic LA-5269 Transcoder 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 6-6 GPI/O Port Pinout Connection GPI 1 GPI 2 GPI 3...

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