miniDSP UMA-16 Manuale utente
miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 1
UMA-16
MICROPHONE ARRAY DEVELOPMENT BOARD
User Manual
miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 2
Revision history
Revision
Description
Date
V1.0
First version
18 Jan 2018
V1.1
Updated for MCHStreamer Lite interface (preliminary)
17 May 2022
miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 3
TABLE OF CONTENTS
Table of contents ............................................................................................................................................. 3
IMPORTANT INFORMATION ............................................................................................................................. 4
1 Product Overview ...................................................................................................................................... 6
2 Board Layout and Connectivity .................................................................................................................. 7
2.1 Board layout .............................................................................................................................................. 7
2.2 USB Connectivity ....................................................................................................................................... 8
2.3 Knowles SPH1668LM4H-1 microphones ................................................................................................... 8
3 USB Audio ................................................................................................................................................ 10
3.1 macOS ..................................................................................................................................................... 10
3.2 Windows ................................................................................................................................................. 11
3.2.1 USB Driver installation ..................................................................................................................... 11
3.2.2 Status ............................................................................................................................................... 11
3.2.3 Buffer settings ................................................................................................................................. 12
3.2.4 Volume ............................................................................................................................................ 12
3.2.5 Info .................................................................................................................................................. 13
3.3 Compliant USB audio software ............................................................................................................... 13
4 Custom Microphone Board Development ................................................................................................ 14
4.1 Headers and pinouts ............................................................................................................................... 14
4.2 PDM overview ......................................................................................................................................... 16
5 Additional Information ............................................................................................................................ 17
5.1 Specifications .......................................................................................................................................... 17
5.2 MCU firmware update ............................................................................................................................. 18
5.2.1 Windows .......................................................................................................................................... 18
5.3 Obtaining support ................................................................................................................................... 20
5.4 Schematics .............................................................................................................................................. 20
miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 4
IMPORTANT INFORMATION
Please read the following information before use. In case of any questions, please contact miniDSP via the
support portal at support.minidsp.com.
System Requirements
To configure the UMA-16, you will require a Windows PC or Apple Mac computer with the following minimum
specification:
Windows
• Microsoft• ® Windows® 7/8.1/10/11
• At least a dual core i3, i5, or i7 processor
• At least 2 GB RAM (4 GB or more preferred)
• One free USB 2.0 port
• Internet connection
macOS
• OS X 10.8 or higher, macOS 10.12 or higher
• At least a dual core i3, i5, or i7 processor, or an ARM processor (M1/Pro/Max)
• At least 2 GB RAM (4 GB or more preferred)
• One free USB 2.0 port
• Internet connection
Disclaimer/Warning
miniDSP cannot be held responsible for any damage that may result from the improper use of this product or
incorrect configuration of its settings. As with any other product, we recommend that you carefully read this
manual and other technical notes to ensure that you fully understand how to operate this product. The miniDSP
audio processor is a powerful tool, and misuse or misconfiguration, such as incorrectly set gains or excessive
boost, can produce signals that may damage your audio system.
As a general guideline, you should perform the initial configuration of the miniDSP audio processor before
enabling audio through any connected output device or amplification. Doing so will help ensure that the
software is correctly configured.
Finally, note that the miniDSP audio processor is a very flexible device, and many of the questions we receive at
the tech support department are already answered in this user manual and in the online application notes on
the miniDSP.com website. So please take the time to carefully read this user manual and the online technical
support. Thanks for your understanding!
Warranty Terms
miniDSP Ltd warrants this product to be free from defects in materials and workmanship for a period of one
year from the invoice date. Our warranty does not cover failure of the product due to incorrect connection or
installation, improper or undocumented use, unauthorized servicing, modification or alteration of the unit in any
way, or any usage outside of that recommended in this manual. If in doubt, contact miniDSP prior to use.
miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 5
FCC Class B Statement
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
• This device may not cause harmful interference.
• This device must accept any interference received, including interference that may cause undesired
operation.
Warning: This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection. This
equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance
with the instructions, may cause interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause harmful interference to radio
or television reception, which can be determined by turning the equipment off and on, the user is encouraged to
try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
Notice: Shielded interface cable must be used in order to comply with emission limits.
Notice: Changes or modification not expressly approved by the party responsible for compliance could void the
user’s authority to operate the equipment.
CE Mark Statement
The miniDSP UMA-16 has passed the test performed according to European Standard EN 55022 Class B.
A note on this manual
This User Manual is designed for reading in
both print and on the computer. If printing
the manual, please print double-sided. The
embedded page size is 8 ½” x 11”. Printing on
A4 paper will result in a slightly reduced size.
For reading on the computer, we have
included hyperlinked cross-references
throughout the manual. In addition, a table of
contents is embedded in the PDF file. Use the
View menu (Preview on Mac) or the
bookmarks sidebar (Adobe reader on Mac and
Windows) to view this table of contents.
Acknowledgments
ASIO® is a registered trademark of Steinberg Media Technologies GmbH.
miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 6
1
PRODUCT OVERVIEW
Thank you for choosing the UMA-16 audio processor board. The UMA-16 is a cost effective sixteen-channel
microphone array with plug-and-play USB audio connectivity. With its embedded XMOS interface, the UMA-16 is
the perfect fit for researchers looking to develop their own beam forming algorithms.
The UMA-16 system architecture is powered by two core elements:
- A microphone array PCB with 16 x SPH1668LM4H MEMS Knowles with PDM outputs. A center hole fits an
optional USB camera perfect in applications such as acoustic cameras. The microphone array is a simple 2-
layer design that can easily be customized to your needs by following our schematics included in this user
manual.
- Stacked on top of the mic array is the MCHStreamer Lite USB interface. This XMOS XCORE multicore CPU
allows for a high quality PDM to PCM conversion and presents all 16 channels of raw audio to the ASIO USB
audio driver.
Please note that the following sections will highlight basic operation of the UMA-16. Beamforming algorithm
development or any 3rd party support for software (e.g. Matlab) is considered outside the scope of this manual
and our support structure.
miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 7
2
BOARD LAYOUT AND CONNECTIVITY
2.1
BOARD LAYOUT
The below diagram shows the layout of the UMA-16 board. Sixteen MEMS microphone are laid out in a Uniform
Rectangular Array (URA) distribution, with microphone offset set to 42mm. CAD drawings are available on
request.
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2.2
USB CONNECTIVITY
Connect the USB port (type B) to a computer. The USB port provides asynchronous USB Audio (Class 2)
streaming at the sample rates 14.7/11.025/12/16/22.05/44.1/48kHz. See section 3 for more details on USB
audio connectivity
The array is powered over the USB connection, so there is no need to separately connect power.
2.3
KNOWLES SPH1668LM4H-1 MICROPHONES
The UMA-16 is fitted with 16 Knowles MEMS microphones. Please refer to the complete datasheet for more
details.
Features
• Low Distortion of 1.6% at 120dBSPL
• High SNR of 65.5dB
• Flat Frequency Response
• RF Shielded
• Zero-Height Mic™
• Supports Dual Multiplexed Channels
• Standard SMD Reflow
• Omnidirectional
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Acoustic performance under the Performance Mode (default)
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3
USB AUDIO
The miniDSP UMA-16 streams PCM audio at sample rates of 14.7k/11.025k/12k/16k/22.05k/44.1k/48k over its
USB Audio Class 2 (UAC2) compliant interface. Here are more details on setup and configuration.
3.1
MACOS
Open the program Audio MIDI Setup (in Applications->Utilities). The UMA-16 will appear as “MCHStreamer
micArray 16” in the list on the left-hand side. Clicking on it will show the input and output channels. Sample rate
can be selected in the dropdown menus:
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