Rohde & Schwarz CMW-B400B User manual

R&S®CMW-B400B/-B405A
Audio Measurements
User Manual
User Manual
1176.8116.02 ─ 04
(;Úß@2)
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)
© 2015 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
1 Preface.................................................................................................... 7
1.1 How to Read Firmware Application Chapters............................................................ 7
1.1.1 General Description........................................................................................................ 7
1.1.2 Application Sheets.......................................................................................................... 8
1.1.3 GUI Reference................................................................................................................ 8
1.1.4 Programming Examples..................................................................................................8
1.1.5 Command Reference...................................................................................................... 8
2 What'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...............................................................................................23
4 GUI Reference ..................................................................................... 24
4.1 Main View.....................................................................................................................24
4.1.1 Scenario Selection........................................................................................................ 25
4.1.2 Analog/Digital Meas Tab............................................................................................... 26
4.1.3 Speech Analysis Tab.................................................................................................... 27
4.2 Measurement and Generator Control........................................................................29
4.3 Audio Measurement Settings.....................................................................................30
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4.3.1 General Settings (Analog).............................................................................................30
4.3.2 General Settings (Digital).............................................................................................. 33
4.3.3 Single Tone Settings..................................................................................................... 34
4.3.4 Multitone Settings..........................................................................................................37
4.3.5 FFT Noise Settings....................................................................................................... 38
4.4 Audio Generator Settings...........................................................................................40
4.4.1 General Settings........................................................................................................... 40
4.4.2 Single Tone Settings..................................................................................................... 41
4.4.3 Multitone Settings..........................................................................................................41
4.4.4 FFT Noise Settings....................................................................................................... 44
4.5 Speech Analysis Settings.......................................................................................... 44
4.6 Additional Softkeys and Hotkeys.............................................................................. 46
5 Programming........................................................................................47
5.1 Audio Measurement and Generator Scenario.......................................................... 47
5.1.1 Reset and Scenario Selection.......................................................................................47
5.1.2 General Measurement Settings.................................................................................... 48
5.1.3 Single Tone Measurement............................................................................................ 48
5.1.4 Multitone Measurement.................................................................................................49
5.1.5 FFT Noise Measurement.............................................................................................. 51
6 Command Reference........................................................................... 52
6.1 Conventions and General Information......................................................................52
6.1.1 MEAS<i> and GEN<i>.................................................................................................. 52
6.1.2 FETCh and READ Commands..................................................................................... 52
6.1.3 Current and Statistical Results......................................................................................52
6.1.4 Keywords...................................................................................................................... 53
6.1.5 Reliability Indicator........................................................................................................ 53
6.2 General Settings..........................................................................................................56
6.3 Audio Measurements..................................................................................................58
6.3.1 Measurement Control and States................................................................................. 58
6.3.2 General Measurement Settings.................................................................................... 60
6.3.3 Single Tone Measurement Settings.............................................................................. 65
6.3.4 Single Tone Measurement Results............................................................................... 71
6.3.5 Multitone Measurement Settings...................................................................................74
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6.3.6 Multitone Measurement Results....................................................................................76
6.3.7 FFT Noise Measurement Settings................................................................................ 78
6.3.8 FFT Noise Measurement Results................................................................................. 79
6.4 Audio Generators........................................................................................................82
6.4.1 Generator Control and States....................................................................................... 82
6.4.2 General Generator Settings.......................................................................................... 82
6.4.3 Single Tone Generator Settings....................................................................................83
6.4.4 Multitone Generator Settings........................................................................................ 84
6.4.5 FFT Noise Generator Settings...................................................................................... 90
6.5 Speech Analysis..........................................................................................................90
List of Commands................................................................................93
Index......................................................................................................97
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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.
There is a separate manual version for each R&S CMW model.
●Additional user manuals, like this document, describe the firmware applications.
There is only one version of these manuals for all R&S CMW models.
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, for example 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 descrip-
tions.
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 measurement applications a detailed description of measurement results and a
description of configurable limits is given, including the relation to conformance require-
ments defined in network standard specifications.
How to Read Firmware Application Chapters
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Preface
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1.1.2 Application Sheets
This optional section provides short application examples for select issues and related
background information.
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 hid-
den 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 "Com-
mand Reference" is provided. Ranges for numeric parameters and reset values are
given there.
For measurement results links to the corresponding command descriptions are provi-
ded (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 applica-
tion via a remote-control program and how to retrieve measurement results. The exam-
ples consist of comprehensive command sequences. You can check just a single com-
mand 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 com-
mand script, under consideration of dependencies and required orders of the com-
mands.
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 firm-
ware 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 3.5.10 and later of the "Audio Measurement" firmware
application. Compared to version 3.2.30, it provides the following new features and
changes:
●Speech analysis enhancements:
–Changed coupling between speech codec and signaling application. The set-
ting "Enable Speech Codec" is removed from the signaling applications. The
coupled application is now selected in the audio measurement settings, see
Speech Analysis Settings.
– Event log and information provided by coupled master application, see Speech
Analysis Tab
– The clock of the audio board can be adjusted, see Clock Drift
●Scenario selection improvements:
– New commands, one command per scenario, see General Settings
– The scenario is selectable per audio application instance.
●Support of STATus:OPERation registers, with the following register paths:
– STATus:OPERation:TASK:A:AUDio:GENerator<i>:ANALog | DIGital
– STATus:OPERation:TASK:A:AUDio:MEASurement<i>:ANALog | DIGital
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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 sin-
gle option (R&S CMW-B400B or R&S CMW-U400) provides an audio board, two ana-
log and two digital audio generator instances, two analog and two digital audio mea-
surement 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 gener-
ate 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 generator 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, com-
bined 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 fre-
quency 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 controlling application or encodes an audio signal
and delivers it to the controlling application.
Thus the speech codec allows to feed an audio signal into an established RF connec-
tion to the DUT or to extract an audio signal from the RF connection. The controlling
application can be a signaling application, the IMS server of the DAU (for VoLTE) or a
protocol test application.
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.
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