Linear Acoustic LA-5291 Professional Audio Encoder User manual

Linear Acoustic

®

LA-5291

Professional Audio Encoder

Installation & User’s Guide

V1.0.25 June 2020

2001-00525-000

TelosAlliance.com

User Warnings and Cautions

The installation and service instructions in this manual are for use by qualiﬁed personnel only. This

equipment is not suitable for use in locations where children are likely to be present. To avoid electric

shock, do not perform any servicing other than that contained in the operating instructions unless you

are qualiﬁed to do so. Refer all servicing to qualiﬁed personnel

This instrument has an auto-ranging line voltage input. Ensure the power voltage is within the speciﬁed

range of 100-240VAC. The ~ symbol, if used, indicates an alternating current supply. Equipment must

be connected to protective earthing by means of a power cord connected to a socket outlet. Equipment

with an earthing terminal should be connected to a proper ground system with 20 – 14 AWG (0.5 –

1.5mm) wire.

This symbol, wherever it appears, alerts you to the presence of uninsulated, dangerous voltage

inside the enclosure – voltage which may be suﬃcient to constitute a risk of shock. Disconnect

equipment from all power sources before any servicing of parts.

This symbol, wherever it appears, alerts you to important operating and maintenance instruc-

tions. Read the manual.

This symbol, whenever it appears, identiﬁes the associated terminal as an earth ground for

protection against electric shock in case of a fault. The terminal should be connected to a

proper ground system with 20 – 14 AWG (0.5 – 1.5mm) wire.

This symbol, whenever it appears, indicates a fuse to protect against excessive current. When

replacing fuses, use only the type and rating of the original fuse as indicated by the manufacturer. Never

install a fuse with a higher current value.

CAUTION: HAZARDOUS VOLTAGES

The instrument power supply incorporates an internal fuse. Hazardous voltages may still be present on

some of the primary parts even when the fuse has blown. If fuse replacement is required, replace fuse

only with same type and value for continued protection against ﬁre.

WARNING:

The product’s power cord is the primary disconnect device. The socket outlet should be located near

the device and easily accessible. The unit should not be located such that access to the power cord is

impaired. If the unit is incorporated into an equipment rack, an easily accessible safety disconnect

device should be included in the rack design.

To reduce the risk of electrical shock, do not expose this product to rain or moisture. This unit is for

indoor use only.

This equipment requires the free ﬂow of air for adequate cooling. Do not block the ventilation openings

on the rear and sides of the unit. Failure to allow proper ventilation could damage the unit or create a

ﬁre hazard. Do not place the units on a carpet, bedding, or other materials that could interfere with any

panel ventilation openings.

If the equipment is used in a manner not speciﬁed by the manufacturer, the protection provided by the

equipment may be impaired.

USA CLASS A COMPUTING DEVICE INFORMATION TO USER.

WARNING:

This equipment generates, uses, and can radiate radio-frequency energy. If it is not installed and used as

directed by this manual, it may cause interference to radio communication. This equipment complies

with the limits for a Class A computing device, as speciﬁed by FCC rules, part 15, subpart j, which are

designed to provide reasonable protection against such interference when this type of equipment is

operated in a commercial environment. Operation of this equipment in a residential area is likely to

cause interference. If it does, the user will be required to eliminate the interference at the user’s expense.

Note: objectionable interference to TV or radio reception can occur if other devices are connected to

this device without the use of shielded interconnect cables. FCC rules require the use of shielded cables.

CANADA WARNING:

“This digital apparatus does not exceed the Class A limits for radio noise emissions set out in the radio

interference regulations of the Canadian department of communications.”

“Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables

aux appareils numériques (de Class A) prescrites dans le règlement sur le brouillage radioélectrique

édicté par le ministère des communications du Canada.”

CE CONFORMANCE INFORMATION:

This device complies with the requirements of the EEC council directives:

● 93/68/EEC (CE MARKING)

● 73/23/EEC (SAFETY – LOW VOLTAGE DIRECTIVE)

● 89/336/EEC (ELECTROMAGNETIC COMPATIBILITY)

Conformity is declared to those standards: EN50081-1, EN50082-1.

Trademarks, Patents, and Licenses

Telos is a trademark of TLS Corp. All other trademarks are the property of their respective holders.

All versions, claims of compatibility, trademarks, etc. of hardware and software products not made by

The Telos Alliance which are mentioned in this manual or accompanying material are informational

only. The Telos Alliance makes no endorsement of any particular product for any purpose, nor claims

any responsibility for operation or accuracy. We reserve the right to make improvements or changes

in the products described in this manual which may aﬀect the product speciﬁcations, or to revise the

manual without notice.

This document and its content are copyrighted by TLS Corporation and may not be copied, reproduced,

or distributed in any form without expressed written permission.

Patent information can be found at www.TelosAlliance.com/legal

Updates

LA-5291 features and operations are determined largely by software. The Telos Alliance strives to

provide the most stable and feature-rich software available. We encourage you to check for software

updates from time to time by visiting our website or by contacting us directly.

Feedback

We welcome feedback on any aspect of our products or this manual. In the past, many good ideas from

users have made their way into software revisions or new products. Please contact us with your com-

ments or suggestions.

We support you…

By Phone/Fax

You may reach our Telos Support Team in emergencies by calling +1 216-622-0247. For billing ques-

tions or other non-emergency technical questions, call +1 216-241-7225 between 9:00 AM to 5:00 PM

USA Eastern Time, Monday through Friday.

By Email.

Non-emergency technical support is available at Support@TelosAlliance.com.

By Web

The Telos Web site has a variety of information that may be useful for product selection and support.

The URL is https://www.telosalliance.com .

Service

You must contact Telos Alliance before returning any equipment for factory service. We will need

your unit’s serial number, located on the back of the unit. We will issue a return authorization number,

which must be written on the exterior of your shipping container. Please do not include cables or ac-

cessories unless speciﬁcally requested by the Technical Support Engineer. Be sure to adequately insure

your shipment for its replacement value. Packages without proper authorization may be refused. US

customers, please contact Telos Alliance Technical Support at +1-216-622-0247. All other customers

should contact local representative to make arrangements for service.

Warranty

For the latest Telos Alliance warranty, visit: telosalliance.com/warranty

Register your product

Register your product today to get the full beneﬁts of our warranty, support, and product updates.

telosalliance.com/product-registration/

The Telos Alliance

1241 Superior Ave. Cleveland, OH 44114 USA

+1 (216) 241-7225

For Telos Support:

24/7 telephone: +1 (216) 622-0247

Email: [email protected]

Web: telosalliance.com/support-request

Table of Contents

User Warnings and Cautions . . . . . . . . . . . . . . . . . . . . . . . . . ii

We support you… . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

1 Introduction 1

About This User Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Applications and Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Live Dolby Atmos Creation . . . . . . . . . . . . . . . . . . . . . . . . 2

Contribution Encoding . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Headend Transcoding . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Headend Contribution Decoding . . . . . . . . . . . . . . . . . . . . . 4

2 Front and Rear Panel Overview 6

LA-5291 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

LA-5291 Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3 Installation and Initial Setup

Using the Front Panel Interface 8

Physical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Front Panel Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

The Home Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

The Information Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

IP Conguration Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Locate Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Special Function Key Presses . . . . . . . . . . . . . . . . . . . . . . . . . 11

Factory Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Hardware Relay Bypass . . . . . . . . . . . . . . . . . . . . . . . . .12

4 Remote User Interface 14

Connecting to LA-5291 . . . . . . . . . . . . . . . . . . . . . . . . . . .14

User Accounts and Logging In. . . . . . . . . . . . . . . . . . . . . . . 16

LA-5291 Home Screen When Logged In . . . . . . . . . . . . . . . . . . . . 16

5 I/O, Clocking, and Reference 18

Input and Output Routing . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Initial I/O Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Creating an Input Group . . . . . . . . . . . . . . . . . . . . . . . . . 20

Routing a Signal to the Transcoder Input . . . . . . . . . . . . . . . . . . 21

Creating an Output Group . . . . . . . . . . . . . . . . . . . . . . . .22

Routing Transcoded Audio to the Physical Output . . . . . . . . . . . . . . 22

Latency and Delays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Sample Rate Converters . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Clock Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Clock Reference Requirements . . . . . . . . . . . . . . . . . . . . . .25

Setting Clock Reference . . . . . . . . . . . . . . . . . . . . . . . . .26

GPI/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

GPI/O Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

6 System and Network Conguration 30

System Menu Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

System Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

IP Conguration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

7 Using the Transcoder 34

Setting Up the Transcoder . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Transcoding Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Advanced Transcoder Controls . . . . . . . . . . . . . . . . . . . . . .36

Decoder Metadata Screen . . . . . . . . . . . . . . . . . . . . . . . . . . 37

8 Specications 38

Coding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

Decoding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Transcoding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Encoding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

SDI I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

AES-3 I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

AES67 I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

MADI I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Latency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Sample Rate/Resolution/Frequency Response . . . . . . . . . . . . . . . . . 39

Ethernet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Parallel GPI/O Control Port . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Front Panel Controls and Indicators . . . . . . . . . . . . . . . . . . . . .40

Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Dimensions and Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Intended Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Regulatory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

Licensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

Creating the Most Exciting and Engaging

Audio Experiences Imaginable

Congratulations on your new Telos Alliance product!

The gang here at Telos is committed to shaping the future of audio by delivering innovative, intuitive

solutions that inspire our customers to create the most exciting and engaging audio experiences imaginable.

We’re grateful that you have chosen audio tools from Telos® Systems, Omnia® Audio, Axia® Audio,

Linear Acoustic®, 25-Seven Systems®, and Minnetonka Audio®. We’re here to help you make your

work truly shine. We hope that you enjoy your Telos Alliance product for many years to come and won’t

hesitate to let us know if we can help in any way.

The Telos Alliance

Chapter 1

| 1

Introduction

1 Introduction

Congratulations on your purchase of the Linear Acoustic LA-5291 Professional Audio Encoder.

The LA-5291 provides decoding, encoding, and transcoding to and from PCM and select Dolby® coded formats

for up to 16 audio channels in support of real-time immersive Dolby Atmos® workﬂows. This includes:

♦ Decoding Dolby ED2 to PCM

♦ Transcoding Dolby ED2 and Dolby E to Dolby Digital Plus and Dolby Digital Plus JOC

♦ Encoding PCM to Dolby Digital, Dolby Digital Plus JOC, and Dolby ED2

In the OB truck, the LA-5291 can encode a Dolby Atmos mix into either Dolby ED2 for backhaul to the network

center or directly to Dolby Digital Plus JOC for direct transmission to the viewer.

In the broadcast center, it can decode an incoming ED2 stream from the venue and send the PCM audio through

the facility for mixing in with studio shows and the playback of interstitials and commercials.

In the air chain, the LA-5291 can encode PCM coming through the plant to Dolby Digital Plus JOC or transcode an

incoming ED2 stream directly to Dolby Digital Plus JOC.

About This User Guide

A printed copy of the LA-5291 Quick Start Guide was included with your LA-5291 and will walk you through the

rear panel connections, setting up and conﬁguring network control, and basic I/O and program routing. A PDF of

the QSG is available for download from our website at www.telosalliance.com

This manual will provide more detailed information, including an in-depth description about speciﬁc functions

and controls.

Chapter 1

| 2

Introduction

Applications and Use Cases

Live Dolby Atmos Creation

In this example, two devices are employed: A Dolby DP590 to author the Atmos-related metadata, and the LA-

5291 to encode the Dolby ED2 or Dolby Digital Plus JOC.

♦ The DP590 ingests PCM audio over a MADI connection, which can be a combination of stem mixes and

objects

♦ The DP590 outputs a rendered presentation over MADI for monitoring

♦ The DP590 functions may be controlled via the mixing console using GPIO or Ember+, or directly via its web

remote UI

♦ The DP590 outputs metadata via an IP connection

♦ The LA-5291 encodes the content into Dolby ED2 or Dolby Digital Plus JOC

Figure 1-1 – Live Dolby Atmos creation

Chapter 1

| 3

Introduction

Contribution Encoding

In this example, the Dolby DP590 and LA-5291 work together for contribution encoding.

♦ The LA-5291 ingests PCM over MADI or SDI from the DP590, with the metadata being delivered to the

LA-5291 via an IP connection.

♦ The LA-5291 drives the output based on the Vref input

♦ The LA-5291 encodes PCM + PMD to Dolby ED2 or Dolby Digital Plus JOC and outputs it via SDI, 2x AES-3,

or AES67

Figure 1-2 – Contribution encoding

Headend Transcoding

In this example, the LA-5291 provides transcoding at the headend:

♦ The LA-5291 ingests Dolby ED2, Dolby E, or PCM via Quad-Link 3G SDI, AES67, or Audio/Video over IP

(SMPTE ST 2110)

♦ The LA-5291 supports a Vref input to drive the output

♦ The LA-5291 transcodes Dolby ED2 or Dolby E to Dolby Digital Plus JOC

♦ The LA-5291 outputs Dolby Digital Plus JOC over Quad-Link 3G SDI, AES-3, AES67, or Audio/Video over IP

Figure 1-3 – Headend transcoding

Chapter 1

| 4

Introduction

Headend Contribution Decoding

Here, the LA-5291 ingests a coded stream and decodes it:

♦ The LA-5291 ingests a Dolby ED2 stream over Quad-Link 3G SDI, Audio/Video over IP, or AES67

♦ The LA-5291 decodes the coded streams and outputs PCM to route through the facility and mix in with

studio shows, advertisements and interstitials, etc.

♦ The second LA-5291 encodes the PCM signal going to air into the ﬁnal Dolby Atmos (Dolby Digital Plus

JOC) signal

Figure 1-4 – Headend contribution decoding

Chapter 2

| 6

Front and Rear Panel Overview

2 Front and Rear Panel Overview

LA-5291 Front Panel

Figure 2-1 – LA-5291 front panel

LA-5291 front panel features include:

♦ Reset button for restarting the unit from the front panel (2-1A)

♦ Four status LEDs indicating the status of each power supply (2-1B, 2-1C), the overall status of the unit

(2-1D), and sync for the reference clock (2-1E).

♦ A color LCD display to show status and basic conﬁguration parameters (2-1F)

♦ A five-button navigation cluster with Left, Right, Up, and Down arrows plus a green “OK” button (2-1G)

♦ A USB port used for software updates (2-1H)

Basic conﬁguration and status monitoring can be performed using the front panel controls as outlined in Chapter

3. Connecting to LA-5291 via the web-based user interface (more on that in Chapter 4) provides easier navigation

and full control of the unit.

Chapter 2

| 7

Front and Rear Panel Overview

LA-5291 Rear Panel

Figure 2-2 – LA-5291 rear panel

The rear panel of the LA-5291 contains the following connections:

♦ Two RJ-45 Gigabit Ethernet connections, one for network remote control (2-2A) and one for AES67 I/O

(2-2B)

♦ 3Gb/s HD/SD-SDI inputs and outputs (2-2C) on female BNC connectors

♦ Quad-Link SDI or MADI I/O (2-2D) - optional

♦ Five AES-3 I/O connections (2-2E) on female BNC connectors

♦ Parallel GPI/O control port (female DB-15) for ﬁve inputs and ﬁve outputs (2-2F)

♦ Two IEC power inlets for the redundant internal universal auto-ranging power supplies (2-2G)

Note:

Although the hardware is present for two independent SDI I/O paths, only the rst SDI I/O is active at this

time. The second path will be enabled in a future rmware update.

Chapter 3 | 8

Installation and Initial Setup Using the Front Panel Interface

3 Installation and Initial Setup

Using the Front Panel Interface

Physical Installation

The LA-5291 is a 1RU product intended to be permanently installed in a standard 19 1/2” equipment rack and

secured with four standard rack screws.

LA-5291 is fan cooled with air intakes and exhausts located on the side of the unit just behind the front panel, but

whenever possible it is recommended to leave 1RU of empty space above and below the unit.

Important:

Please see the “User Warnings and Cautions” section of this manual for important electrical safety information.

Power

The LA-5291 has two internal auto-ranging redundant power supplies protected by type T1AL25V fuses. Remem-

ber that while redundant supplies do protect against the unit losing power in the event of a PSU failure, the loss of

mains supply voltage is a bigger concern. Accordingly, each supply should be fed from a diﬀerent circuit equipped

with adequate surge protection and ﬁtted with an uninterruptible power supply (UPS). Providing the receptacles

to which the supplied power cords are connected are grounded, the power connection serves as a ground.

Additionally, the rear panel earthing terminal should be connected to a proper ground system with 20 – 14 AWG

(0.5 – 1.5mm) wire.

Front Panel Buttons

As mentioned brieﬂy in Chapter 2, the front panel of LA-5291 includes a ﬁve-button navigation cluster with Left,

Right, Up, and Down arrow buttons plus a green “OK” button in the center.

The arrow buttons are used for navigating through the menus, and the “OK” button acts as an “Enter” or “Select”

key.

Chapter 3 | 9

Installation and Initial Setup Using the Front Panel Interface

The Home Screen

The IP address of the network Control port (used to connect to the remote user interface) is shown in the lower

left corner. If a network connection is detected, the IP address will be yellow. If there is no network connection, the

IP address will be red.

The primary reference clock source and status is shown in the lower right corner. Green indicates an active solid

reference. Red indicates an inactive or missing reference.

Figure 3-1 – Front panel Home screen

The Information Screen

Pressing the Right button navigates to the Information screen.

The name of this particular LA-5291 and its location are displayed at the top of the screen. These values can be

customized using the remote interface as detailed in Chapter 6.

The unit’s unique serial number is shown next, followed by the current ﬁrmware version, the IP address of the

Control port (the port used to connect to the remote interface), the IP address of the AES67 port (the port used to

carry AES67 AoIP), and the current active clock reference.

Figure 3-2 – Front panel Information screen

Chapter 3 | 10

Installation and Initial Setup Using the Front Panel Interface

IP Conguration Screen

Another press of the Right button brings you to the IP Conﬁguration screen for the Control port.

Figure 3-3 – Front panel IP conﬁguration screen

Important!

The Control and AES67 Ethernet connections both require 1000BASE-T (Gigabit) switch ports in order to

work properly.

If both the Control and AES67 ports will be used, they must be in dierent subnets. In-band control is

available using the AES67 port.

If only one port will be used, set the unused port to “Static IP” with an IP Address of 0.0.0.0, a Subnet Mask of

0.0.0.1, and a Gateway of 0.0.0.0.

By default, the LA-5291 will automatically obtain an IP address from a DHCP server which will suﬃce to provide

initial remote access to the unit for conﬁguration purposes. A ﬁxed IP address will be preferred in most cases and

can be set as follows:

1. Press the OK button to highlight “Edit”

2. Press OK again to highlight “Use DHCP”

3. Press the Right button to highlight “Yes”

4. Press the Up/Down button to “No”

5. Press the Left button to highlight the “Static IP Address” ﬁelds

a. Press the Down button to highlight “Address”

b. Press the Right button to move to the ﬁrst digit of the IP address

c. Use the Up/Down buttons to change the selection

d. Press the Right/Left buttons to select another digit to edit

e. When ﬁnished editing the address ﬁeld, press the Right or Left button to return to “Address”

f. Press the Down button to navigate to the Netmask and Gateway ﬁelds

Chapter 3 | 11

Installation and Initial Setup Using the Front Panel Interface

6. Repeat the above steps to edit the Netmask and Gateway ﬁelds; note that the gateway may be set to

000.000.000.000 if no gateway is required

7. After the gateway is set, press the Left button to highlight “Gateway”

8. Press the Down button to highlight “Update”

9. Press OK to save the new IP information

10. If you suddenly notice you’ve entered some incorrect information and need to bail out and start over, use the

Right/Left buttons to highlight “Cancel” followed by “OK”

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Locate Mode

Our sincere hope is that you like your LA-5291 so much that you’ll eventually end up with dozens of them pop-

ulating your racks, but since one LA-5291 looks pretty much like another, we’ve come up with a way to help you

identify an individual unit.

When you enable the “Locate Mode” from the remote user interface, the unit’s front panel display will repeatedly

change color until Locate Mode has been cleared by pressing any key on the front panel or by pressing the “Locate

Unit” button on the remote user interface a second time. Enabling Locate Mode aﬀects only the unit’s display, and

has no eﬀect on the audio.

Special Function Key Presses

Performing a full Factory Reset and engaging the Hardware Relay Bypass are possible from the front panel by

pushing and holding a particular combination of buttons.

Factory Reset

To reset the unit to its factory defaults, simultaneously press and hold the Left, Up, and Right buttons for ten

seconds until a red countdown timer appears in the bottom left corner of the display.

Important!

Performing a factory reset will erase all I/O routing as well as any other custom settings you may have saved.

This information cannot be reclaimed once you reset the LA-5291, even by contacting customer support

or feeling genuine remorse for your decision. We strongly recommend backing up your conguration to a

computer before performing a factory reset to avoid re-setter’s remorse. You have been warned!

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Linear Acoustic LA-5291 Professional Audio Encoder User manual

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