Rohde & Schwarz CMW-B400B User manual

R&S®CMW-B400B/-B405A
Audio Measurements
User Manual
User Manual
(;Úß@2)
1176.8116.02 ─ 01
Test & Measurement
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This user manual describes the following R&S®CMW options:
●R&S®CMW-B400B (Audio analyzer/generator, for new units and units delivered after September 2011)
●R&S®CMW-U400 (Audio analyzer/generator, for units delivered before September 2011)
●R&S®CMW-B405A (Speech codec)
© 2013 Rohde & Schwarz GmbH & Co. KG
Mühldorfstr. 15, 81671 München, Germany
Phone: [phone] - 0
Fax: [phone]
E-mail: [email protected]
Internet: www.rohde-schwarz.com
Subject to change – Data without tolerance limits is not binding.
R&S® is a registered trademark of Rohde & Schwarz GmbH & Co. KG.
Trade names are trademarks of the owners.
The following abbreviations are used throughout this manual: R&S®CMW is abbreviated as R&S CMW.
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Contents
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Contents
1Preface....................................................................................................7
1.1 How to Read Firmware Application Chapters............................................................7
1.1.1 General Description........................................................................................................7
1.1.2 Application Sheets..........................................................................................................7
1.1.3 GUI Reference................................................................................................................8
1.1.4 Programming Examples..................................................................................................8
1.1.5 Command Reference......................................................................................................8
2What's New in this Revision..................................................................9
3 General Description.............................................................................10
3.1 Test Setups..................................................................................................................11
3.1.1 Audio Connectors..........................................................................................................11
3.1.2 Test Setup for Audio Measurement and Generator......................................................12
3.1.3 Test Setup for Microphone- and Speaker Test.............................................................13
3.1.4 Test Setup for External Speech Analysis......................................................................14
3.2 Performing Audio Measurements..............................................................................15
3.3 AF Filter Settings........................................................................................................16
3.4 Measurement Results.................................................................................................17
3.4.1 Single Tone Results......................................................................................................18
3.4.2 Multitone Results...........................................................................................................20
3.4.3 FFT Noise Results........................................................................................................21
3.4.4 Modifying Diagrams......................................................................................................22
3.4.5 Using Markers...............................................................................................................22
3.4.6 Common View Elements...............................................................................................22
4GUI Reference .....................................................................................24
4.1 Main View.....................................................................................................................24
4.1.1 Scenario Selection........................................................................................................24
4.1.2 Analog/Digital Meas Tab...............................................................................................26
4.1.3 Speech Analysis Tab....................................................................................................27
4.2 Measurement and Generator Control........................................................................27
4.3 Audio Measurement Settings.....................................................................................28
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4.3.1 General Settings (Analog).............................................................................................29
4.3.2 General Settings (Digital)..............................................................................................31
4.3.3 Single Tone Settings.....................................................................................................32
4.3.4 Multitone Settings..........................................................................................................34
4.3.5 FFT Noise Settings.......................................................................................................36
4.4 Audio Generator Settings...........................................................................................37
4.4.1 General Settings...........................................................................................................37
4.4.2 Single Tone Settings.....................................................................................................38
4.4.3 Multitone Settings..........................................................................................................38
4.4.4 FFT Noise Settings.......................................................................................................40
4.5 Speech Analysis Settings..........................................................................................41
5Programming........................................................................................43
5.1 Audio Measurement and Generator Scenario..........................................................43
5.1.1 Reset and Scenario Selection.......................................................................................43
5.1.2 General Measurement Settings....................................................................................44
5.1.3 Single Tone Measurement............................................................................................44
5.1.4 Multitone Measurement.................................................................................................45
5.1.5 FFT Noise Measurement..............................................................................................46
6Command Reference...........................................................................48
6.1 Conventions and General Information......................................................................48
6.1.1 MEAS<i> and GEN<i>..................................................................................................48
6.1.2 FETCh and READ Commands.....................................................................................48
6.1.3 Current and Statistical Results......................................................................................48
6.1.4 Reliability Indicator........................................................................................................49
6.2 General Settings..........................................................................................................51
6.3 Audio Measurements..................................................................................................52
6.3.1 Measurement Control and States.................................................................................52
6.3.2 General Measurement Settings....................................................................................54
6.3.3 Single Tone Measurement Settings..............................................................................58
6.3.4 Single Tone Measurement Results...............................................................................63
6.3.5 Multitone Measurement Settings...................................................................................66
6.3.6 Multitone Measurement Results....................................................................................68
6.3.7 FFT Noise Measurement Settings................................................................................70
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6.3.8 FFT Noise Measurement Results.................................................................................72
6.4 Audio Generators........................................................................................................74
6.4.1 Generator Control and States.......................................................................................74
6.4.2 General Generator Settings..........................................................................................75
6.4.3 Single Tone Generator Settings....................................................................................75
6.4.4 Multitone Generator Settings........................................................................................76
6.4.5 FFT Noise Generator Settings......................................................................................82
6.5 Speech Analysis..........................................................................................................83
List of Commands................................................................................84
Index......................................................................................................87
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Contents
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Preface
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1 Preface
The operation of the R&S CMW is described in several user manuals:
●The R&S CMW user manual describes the base software, common features of the
firmware applications and basic principles for manual operation and remote control.
●Additional user manuals, like this document, describe the firmware applications.
Rohde & Schwarz provides registered users a "CMW Customer Web" section on
GLORIS, the Global Rohde & Schwarz Information System: https://extranet.rohde-
schwarz.com. From this resource you can download software updates, waveform library
updates and documentation updates, e.g. updates of this document.
1.1 How to Read Firmware Application Chapters
Each firmware application is described in a separate chapter. These chapters can be
read independently of each other. However, they are all organized as follows:
1. General Description
2. Application Sheets (optional)
3. GUI Reference
4. Programming Examples
5. Command Reference
The chapters "System Overview" and "Remote Control" in the R&S CMW user manual
provide additional important information independent of the individual firmware applica-
tions. The most important parts are referenced by the firmware application descriptions.
1.1.1 General Description
This section provides a general description of the firmware application, independent of a
specific operation mode (manual or remote control). It gives a high-level introduction to
the capabilities of the firmware application. Background information related to the network
standard is given as far as it is directly related to administrable parameters. For mea-
surement applications a detailed description of measurement results and a description
of configurable limits is given, including the relation to conformance requirements defined
in network standard specifications.
1.1.2 Application Sheets
This optional section provides short application examples for select issues and related
background information.
How to Read Firmware Application Chapters
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Preface
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1.1.3 GUI Reference
The GUI reference describes the manual operation of the firmware application via the
Graphical User Interface (GUI).
The description of a configuration dialog usually starts with a screenshot presenting the
preset values of the parameters (sometimes preset values are modified to enable hidden
parts of a dialog). Below the screenshot all shown parameters are described. For each
single parameter a link to the corresponding command description in the "Command
Reference" is provided. Ranges for numeric parameters and reset values are given there.
For measurement results links to the corresponding command descriptions are provided
(commands to retrieve the results). The measurement results are described in detail in
the "General Description".
1.1.4 Programming Examples
The programming examples show how to control and configure the firmware application
via a remote-control program and how to retrieve measurement results. The examples
consist of comprehensive command sequences. You can check just a single command
of a sequence to get an example for the syntax of this single command. But you can also
consider an entire sequence showing the commands in the context of a command script,
under consideration of dependencies and required orders of the commands.
The command sequences are written with the intention to list most commands of the
firmware application. They do not show the fastest way for a given configuration task.
The fastest way would use many reset values and omit the corresponding commands.
The examples are referenced by the command descriptions of the "Command Refer-
ence".
1.1.5 Command Reference
The command reference provides information on the remote commands of the firmware
application. The commands are grouped according to their function.
Each command description indicates the syntax of the command header and of the
parameters. For input parameters the allowed ranges, reset values and default units are
listed, for returned values the expected ranges and default units. Most commands have
a command form and a query form. Exceptions are marked by "Setting only", "Query only"
or "Event". Furthermore a link to the "Programming Examples" is provided and the first
software version supporting the command is indicated.
How to Read Firmware Application Chapters
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What's New in this Revision
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2 What's New in this Revision
This revision describes version 3.2.10 and later of the "Audio Measurement" firmware
application. This is the initial software version.
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General Description
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3 General Description
The "Audio Analyzer/Generator" option enhances the R&S CMW for audio tests. A single
option (R&S CMW-B400B or R&S CMW-U400) provides an audio board, two analog and
two digital audio generator instances, two analog and two digital audio measurement
instances, four analog AF connectors at the front panel and two digital SPDIF connectors
at the rear panel.
You can use all generator and measurement instances in parallel. So you can generate
and measure two analog mono audio test signals and two digital mono audio test signals
in parallel. You can also generate and measure a stereo signal by combining two gen-
erator and measurement instances.
The tests cover the following audio signal properties:
●Characteristics of a single tone signal, for example Total Harmonic Distortion (THD),
Signal to Noise and Distortion ratio (SINAD) and Signal to Noise Ratio (SNR).
●Audio levels of up to 20 single tones at configurable frequencies and levels, combined
to a multitone signal.
●Audio level vs. frequency for a noise signal, consisting of several thousand single
tones. The noise signal has a very low crest factor. It is ideal to analyze the frequency
response of a DUT over the entire audio frequency range, with a single measurement.
Two audio analyzer and generator options are available. They provide the same test
functionality. Which option is required, depends on your instrument:
●Option R&S CMW-B400B "Audio Analyzer/Generator" is compatible to R&S CMW
delivered after September 2011. It is also compatible to R&S CMW delivered before
September 2011, that have been upgraded with R&S CMW-U5024.
●Option R&S CMW-U400 "Audio Analyzer/Generator" is compatible to R&S CMW
delivered before September 2011, that have not been upgraded with R&S CMW-
U5024.
Optional speech codec
Optionally, the audio board can be enhanced with a speech codec (R&S CMW-B405A).
A speech codec provides an interface to the signaling units of the R&S CMW. It decodes
the signal delivered by a signaling application or encodes an audio signal and delivers it
to the signaling application.
Thus the speech codec allows to feed an audio signal into an established RF connection
to the DUT or to extract an audio signal from the RF connection. This is possible for
signaling applications supporting the speech interface.
The audio signal can be generated and analyzed internally using the digital audio gen-
erator and measurement. This allows for example microphone- and speaker tests for a
mobile phone.
For speech quality analysis of a mobile phone, the audio signal must be generated and
analyzed by an external audio analyzer (e.g. R&S UPV) connected to the audio connec-
tors of the R&S CMW.
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