DSP4YOU AV2USB User manual

AV2USB
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AV2USB
AVB to USB audio interface
User Manual
Revision
Description
Date
V1.0
Initial revision
05-05-2013

AV2USB
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Description
The AV2USB is a bridging interface allowing any computer to act as an Audio Video Bridging (AVB) endpoint. In other
words giving the ability to stream multiple channels of uncompressed, low latency and tightly synchronized audio
over Ethernet networks. By combining asynchronous USB audio to the latest Audio Video Bridging (AVB) standards,
high end streaming of AV content is finally a reality.
From an operational standpoint on the OS side of the computer, the AV2USB is an 8 channel USB audio device with
24/96kHz support. Routing of the audio channels to the playback/recording software is very simple thanks to the
ubiquity of USB audio class 2.0 device. While seen from the AVB Ethernet network side, the interface is now a so
called “Talker/Listener” device. In other words, a streaming interface able to receive and transmit up to 8 audio
channels, packetized as required in upto 8 streams. The configuration & routing to the AVB world is as simple as a
Drag & Drop process thanks the AVBStreamer software or any IEEE 1722.1 protocol compliant software. From a multi -
channel background music processor to a PC based recorder (court/meeting), the AV2USB rises to your audio
streaming challenges by providing an affordable Plug & Play interface that does not compromise latency & audio
quality
Features
oUSB Audio to Ethernet AVB interface
oLow cost, Low power, small form factor
oOEM friendly
Network
o2 auto-sensing 10/100Mbps ports
oAutomatic fall over for redundancy
oOptional powering by PoE port
Audio Video Bridging (AVB)
oSupport for AVBTP 1722
oUp to 8 x streams of recording & playback
USB Audio
oAsynchronous USB Audio Class 2 (UAC2)
oWindows/Mac/Linux compliant
oUp to 8ch @ 24bit – 48kHz

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Table of Content
1 Product Overview ..................................................................................................................................................................... 4
1.1 Front Panel Description .................................................................................................................................................. 4
1.2 Rear panel description................................................................................................................................................... 4
1.3 Feature description......................................................................................................................................................... 4
1.3.1 Audio Video Bridging............................................................................................................................................... 4
2 Setup guide................................................................................................................................................................................ 5
2.1 AV2USB Box content....................................................................................................................................................... 5
2.2 Connectivity .................................................................................................................................................................... 5
2.2.1 Network...................................................................................................................................................................... 5
2.2.2 DC power connectivity or PoE ............................................................................................................................... 5
2.3 System setup requirements ........................................................................................................................................... 6
2.3.1 PC systems ................................................................................................................................................................. 6
3 Software configuration............................................................................................................................................................. 6
3.1 USB Audio drivers installation under Windows OS ...................................................................................................... 6
3.1.1 Download the latest driver version from DSP4YOU.com.................................................................................... 6
3.1.2 Connect your AV2USB unit ..................................................................................................................................... 6
3.1.3 Setup the driver package....................................................................................................................................... 7
3.2 AV2USB configuration .................................................................................................................................................. 11
3.2.1 Driver general info.................................................................................................................................................. 11
3.2.2 Buffer settings .......................................................................................................................................................... 11
3.2.3 Device configuration............................................................................................................................................. 11
3.2.4 Input channel volume control (recording) ........................................................................................................ 12
3.2.5 Output channel volume control (playback) ..................................................................................................... 12
3.2.6 Clock source ........................................................................................................................................................... 12
3.2.7 Stream formats........................................................................................................................................................ 13
3.3 Mac OSx configuration................................................................................................................................................ 13
3.3.1 Device configuration............................................................................................................................................. 13
3.3.2 Speaker output for default output channel ...................................................................................................... 14
4 AVB Streamer Tools setup guide........................................................................................................................................... 16
4.1 User interface overview of the AVB Streamer toolbox ........................................................................................... 17
4.2 AV2USB Stream configuration..................................................................................................................................... 17
4.2.1 Device info page ................................................................................................................................................... 17
4.2.2 Audio Video Bridging (AVB) stream configuration ........................................................................................... 18
5 Virtual Stream – AVB configuration for 3rd party AVB products ....................................................................................... 21
6 3rd party Software and configuration................................................................................................................................... 21
6.1 Audio Recording........................................................................................................................................................... 21
6.2 Audio Playback............................................................................................................................................................. 21
6.2.1 Foobar (Open Source) .......................................................................................................................................... 22
7 Technical specifications......................................................................................................................................................... 24
7.1 AV2USB Technical specifications................................................................................................................................ 24

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1 Product Overview
1.1 Front Panel Description
1. Network connection #1 on RJ45 connector. Use this connector if you want to power the AV2USB from a PoE
AVB switch
2. Network connection#2 on RJ45. Redundant connection for network.
3. USB Audio 2.0 on miniUSB connector
1.2 Rear panel description
1. DC input for device powering. Requires a stable +5VDC supply supplied with the product
1.3 Feature description
1.3.1 Audio Video Bridging
AVB defines a group of network protocols for the distribution of time synchronized and low latency Audio & Video
streams over IEEE802 networks. By leveraging a combination of existing 802 network technologies along with
standards specifically designed for the purpose, AVB technology lays the ground work for un-paralleled guaranteed
media streaming over Ethernet networks. The overall concept of AVB is actually rather simple. Without getting into
too much detail, the three core protocols specify:
- Timing and synchronization
- Bandwidth allocation through the Stream Reservation Protocol (SRP)
- Traffic shaping to ensure that low priority Ethernet traffic does not interfere with AVB traffic
Engineered from the ground up for media streaming applications, AVB has a definitive edge over legacy Ethernet
technology in the sense that it allows bandwidth allocation and priority rules based on timing. Unlike similar audio
over IP (AOIP) technology, AVB will dynamically assign and defend bandwidth allocation for AVB streaming thanks to
the concept of Stream Reservation Protocol (SRP).
Terminology for AVB streaming goes as follow:
oAudio Video Bridging (AVB): General descriptive for a group of protocols providing audio/ video streaming,
timing, synchronization, Quality of service (QoS) , control and discovery.
oAVB Endpoint: AVB powered device, capable of transmitting and/ or receiving audio streams using P1722/
P1733 transport protocol.
oTalker: AVB endpoint transmitting audio to the network. (Source)
oListener: AVB endpoint receiving audio from the network. (Sink/ Destination)
1
3
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oTalker/Listener: AVB endpoint that is both transmitting and receiving. All AVB endpoints used on Dana series
are by default Talker/Listener devices.
oPrecision Time Protocol (PTP): Allows devices on the network to get a notion of global time in the effort to
synchronize with each other. PTP component in each AVB module can act as a Grand Master (providing
clock) or as a slave (receiving clock). Once a grand master negotiates and is selected as a sync source, all
units will synchronize to it.
oStreams: General term describing packetization of one or multiple audio/ video channels over the network.
Stream can be unicast or multicast. For the time being, the AVB module only supports unicast streaming.
Future revisions will provide additional features.
oStream ID: Unique 64-bit stream identifier used by AVB transport protocols to identify streams.
2 Setup guide
2.1 AV2USB Box content
Box Content
AV2USB module in steel enclosure
Removable wall mount ears
Step-by-step startup guide
1 x CAT6 patch cable
1 x USB2.0 Audio cable
Mounting instructions
The AV2USB unit ships with removable ears allowing wall/ceiling mount installation. Remove the 4 x M3 screws to
modify the configuration of your unit.
2.2 Connectivity
2.2.1 Network
AV2USB requires at least one Ethernet connection for configuration and audio streaming. Configuration is performed
using the provided AVBStreamer toolbox software and using a single Ethernet cable.
A standard-straight through Ethernet CAT5/6 network is required for connectivity through a network switch.
A crossover CAT-5/6 cable is required for direct connectivity to a PC/Mac machine that doesn’t support
auto-switching.
AV2USB devices utilize “Zeroconf” technology for plug&play integration.
- If a DHCP server is present at boot up, the AV2USB will automatically acquire an IP address
- If no DHCP server is present at boot up, the AV2USB will use the Link Local Address (Auto IP) P 169.254.0.xxx
Network requirements:
Audio Video Bridging systems requires special AVB enabled network switches ( so called AVB bridge) to
enjoy the advanced features of AVB such as the Stream Reservation Protocol. Such AVB bridge has the
ability to shape the traffic of the network such that any AVB traffic has higher priority.
If in doubt, don’t hesitate to contact our technical support team at [email protected]
2.2.2 DC power connectivity or PoE
The AV2USB requires an external DC supply either provided by an external 5VDC SMPS or a PoE switch.
OPTION A: +5VDC power supply (provided with the AV2USB). Here is a picture of the power supply provided along
with the plugs.

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OPTION B: 3rd party AVB Switch with PoE capability(not provided)
2.3 System setup requirements
2.3.1 Windows based PC systems
CPU 1GHz or higher
128MB video card
1 x 10/100MB network connection
Latest version of Adobe Flash web plug-in from Adobe.com website : http://get.adobe.com/flashplayer/
Latest version of the Adobe Air environment from Adobe Website: http://get.adobe.com/air/
Keyboard & Mouse
OS: WinXP/Vista/7
2.3.2 Mac OSX
While the USB Audio section is supported under Mac OSx by default, an initial configuration of the stream via the
AVBStreamer toolbox (Windows only) makes the AV2USB not a fully MAC OSX compliant device. An alternative
option can be as follow:
a) Configure the stream/routing of your network using a Windows based PC running the AVBStreamer toolbox
b) Once the network and stream configured, the AVBToolbox software won’t be required anymore and you
can stream audio from your Mac via USB Audio.
3 Software configuration
3.1 USB Audio drivers installation under Windows OS
The AV2USB is an audio class 2.0 device which requires some driver installation under Windows OS. Installation of the
drivers allows any audio playback or recording software to access the USB audio section of the AV2USB. It is
compliant to two standard audio drivers:
- Windows Driver Model (WDM): Almost all software support this scheme but may require some testing since it’s not as
flexible when it comes to routing of the audio channels.
- Audio Stream Input/Output (ASIO) is another driver format optimized for low latency. It is a widely used solution
when it comes to multi-channel audio for professional audio applications e.g. recording/post production software/
3.1.1 Download the latest driver version from DSP4YOU.com
The driver is made available in the User Download section of the dsp4you website. Please log-in with your user
account credentials and look for the AV2USB section at the following link:
http://www.dsp4you.com/user-downloads
Once the driver downloaded, please unzip the folder on your PC, unzip the files to a temporary folder.
3.1.2 Connect your AV2USB unit
In order to automatically detect the AV2USB following the driver installation, you need connect a USB cable between
your PC and the AV2USB.

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3.1.3 Setup the driver package
Click on the setup.exe application to start the installation process. After clicking next, the setup wizard will check your
system capabilities.
If you didn’t connect the USB audio cable and provided power to the AV2USB unit, you will receive the follow
message. Make sure you connect both the USB cable and +5V external DC power to the unit.
Next step is to choose a location on your harddrive for the installation.
Wait for the installation to begin

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.Click on Continue Anyway at the warning about driver certificate.
A successful installation will show the following dialog box.
Following the pre-installation of the drivers on your PC, the connected AV2USB will now be detected by Windows
(pop up window as follow)

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Click on Install the software automatically.
Click on “Continue Anyway” to the warning message about driver signing.

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AV2USB
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3.2 AV2USB USB Audio driver configuration
3.2.1 Driver general info
This panel is just a general information panel with the driver version.
3.2.2 Buffer settings
The buffer setting is meant for those looking to optimize the buffering and latency settings of the interface. Note that
change of these settings may result in unstable operation since such modifications are PC resource-dependant. In
other words your PC + OS configuration may not have the horsepower/memory sufficient to have the lowest latency
settings. If you do not require lowest latency (e.g. simple audio playback), we recommend that you do not modify
the default safe settings.
3.2.3 Device configuration
This panel is the configuration panel for the device currently connected to the PC. Note that only one AV2USB can
be connected to a PC. Multiple AV2USB can however be connected to the network.

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As displayed on the screenshot, the AV2USB is currently locked at 48kHZ sample rate which is a common sample rate
for most AVB products currently shipping on the market.
3.2.4 Input channel volume control (recording)
This panel is self explanatory but here is some basic information of the control available:
o1 x Master volume control for all 8 input channels
o8 x volume controls for all AVB input channels coming from the Network
Note that controls of each channel pair can be linked (stereo case) or unlinked (mono).
The M button is equivalent to the Mute button.
3.2.5 Output channel volume control (playback)
This panel is self explanatory but here is some basic information of the control available:
o1 x Master volume control for all 8 output channels
o8 x volume controls for each AVB outputs channels from PC to the Network
3.2.6 Clock source
This panel just confirms that the clock source is from the AVB network which is the way you would expect. Being an
Asynchronous USB audio device (clock coming from USB audio endpoint), it’s not possible to select another clock
source (e.g. PC).

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3.2.7 Stream formats
Since the AV2USB is always defaulted to 8x IN, 8 x OUT, no configuration is available from the following page.
3.3 Mac OSx configuration
Mac OSx has native support for USB Audio class 2.0 device and therefore doesn’t require any drivers. The device will
automatically be detected as a compliant multichannel USB audio interface. See below some screenshot of the
interface.
3.3.1 Device configuration
Once plugged, the device will automatically appear in Utilities - > Audio Midi setup. Select the interface to configure
the settings such as format/Clock source.

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To enable this sound card as a default output device, you need to right click on the AV2USB interface to tick “Use this
device for sound output”. It will default the AV2USB as the default output device for all your media player
applications.
3.3.2 Speaker output for default output channel
Being a multichannel device, one can easily configure the AV2USB for a 7.1 application if I2S is being used to feed a
multichannel DAC. Here are the 2 most common configurations.
Stereo configuration using the Toslink output to your 3rd party DAC.
Click on Configure Speakers and the below dialog box will appear. Default channels are I2S 1&2. You need to select
Ch9&10 (Toslink TX).

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7.1 multichannel configuration using the I2S outputs
Similar to before but this time, select the 7.1 Surround configuration from the drop down menu. You then just need to
assign the I2S channels as per your DAC configuration.

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4 AVB Streamer Tools setup guide
The AVB Streamer tool is the application used to configure the AVB network and stream routing. It is based on the
Adobe Air environment and currently only operates on PC environments. See below system requirements
Software
- Microsoft• ® Windows® Vista® SP1/ XP pro SP2
- Microsoft• ® .NET framework v3.5
- Adobe AIR environment
Hardware
- PC with 1GHz or higher processor clock speed recommended / Intel® Pentium®/Celeron® family, or AMD
K6®/AMD Athlon®/AMD Duron® family, or compatible processor recommended.
- 256 megabytes (MB) of RAM or higher recommended
- USB 2.0 port
- Keyboard and mouse or compatible pointing device
Step1: Pre-installation steps
- Install .net framework and .Air environment on your PC.
Step2: Getting AVBStreamer Tools install package
- Get the latest version of AVBStreamer tools from www.dsp4you.com. Login with your user account to gain
access to the secure section of the website.
Step3: Installation
- Launch AVBStreamer Toolbox.exe
Following a successful installation, AVBStreamer tools will be automatically launched and discover modules on the
network. See the default startup screen below.
AVB Device Tree
lists devices
discovered on
the network &
Virtual devices

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4.1 User interface overview of the AVB Streamer toolbox
AV2USB configuration software provides a simple user interface for configuration of the AVB
A Device tree on the left side lists all discovered AVB devices on the network
A center section tabbed based structure allows access to the various sections of the user interface
Tabbed Structure
Device info: Provides overall view of the current settings of AV2USB device including the model number,
firmware version, IP settings.
Audio settings: Digital Signal Processing section of the interface. Provides control to the basic gain control
and advanced DSP algorithms running on the on board Digital Signal Processor. Note that the digital signal
processing section will only be enabled if this feature was purchased.
4.2 AV2USB Stream configuration
4.2.1 Device info page
AVB end points are automatically discovered and listed as part of the AVB tree. Once your PC connected to the
network, simply open the AVB Streamer toolbox to have access to all settings.
To access the settings of a specific device, click on the AVB device tree on the left. The device info page will
automatically load the settings for this device. See below an example.
4.2.1.1 Rename device
By default, AVB endpoints will carry the name of the MAC Address of the network interface. The default name can
however be modified to a more meaningful “hostname”.
To change the name of the device, simply type a new name in the text window and click on the SET button.
The renaming is instantaneous and the device will appear in the tree with its new name.

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4.2.1.2 Static IP mode
The AVStreamer toolbox allow for setting up the device as DHCP/AutoIP (i.e. automatic addressing) or Static IP
addressing. Click on the SET button below to access the IP settings page.
By default, all units ship with DHCP/AutoIP mode and is the mode we recommend for all operation.
If using static, insure that you’re aware of what you’re doing else you may not be able to correctly configure the unit.
If you do set the unit in static mode and forget the IP address of the unit, you can easily retrieve it looking at the AVB
bridge window (little window application running in the background of the main application). Here is a scre enshot as
an example showing that 2 devices were discovered and their respective Mac address/IP.
4.2.1.3 Firmware upgrade
The AV2USB can easily be upgraded to new version over the Ethernet. Click Browse to select the firmware you would
like to upgrade the unit with.
Make sure not to un-plug the device during the firmware upload to prevent any corruption of the device.
4.2.2 Audio Video Bridging (AVB) stream configuration
The AV2USB AVB configuration requires limited setup. The following section will highlight steps involved in
building/deleting an AVB stream. Please refer to the AVB primer for the basic terminology used through out this
section.
4.2.2.1 Build a Stream
Click on the “Configure AVB Stream” button to access the following dialog box. The Talker List and Listener list on the
Left and Right pane of the dialog box are automatically generated based on the device discovered on the network.
They will most likely be different in your case. For the purpose of this demo, we’re using 1 x AV2USB and 1 x Eline unit.

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2 simple sections: Talkers (source) on the left, Listeners (destination) on the right.
Select one Talker (i.e. Source) from the Talker list and drag&drop it in the “Drop Talker Here” box. Repeat the same
step for the Listener side (i.e. destination). Let’s use the case where the AV2USB is a talker (i.e. Audio playback from a
software to be played over network) and the Eline is a listener on the AVB network (i.e. AVB to Analog Audio).
With the talker and listener selected, the next step in building a stream is to select the source channels from the talker
channel section. You can select one or multiple audio channels (press the CTRL key) from the Talker list. Simply
‘drag&drop’ them to the Listener channel list as shown below. In this example, we’re using ch_1 and ch_2 of the
AV2USB to be routed to the 2ch of the Eline.
To select one Talker
for configuration,
drag & drop action
as shown by green
arrow
To select one listener
for configuration,
drag & drop action
as shown by green
arrow

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Although the user interface will automatically pack up the talker channel in consecutive order on the listener side,
audio channels can be re-arranged. Using the Up & Down buttons, one can re-organize the order of channels on the
listener side as you wish.
The final step is to click on the BUILD Stream button at the center of the interface.
A confirmation message will appear with the Stream ID information.
4.2.2.2 Delete a stream
Once a stream is configured, the stream is listed in the Talker stream list (below the Talker audio channels), and is
uniquely identified by the Listener’s hostname. To delete a stream, simply drag from the Taker stream list the
particular stream into the garbage bin.
To configure a new stream with a new device, simply drag the Talker or Listener into the garbage bin.
To delete a stream,
simply drag the stream
into the garbage bin as
shown by green arrow