PULSE Sound Quality Software Type 7698

PULSE Sound Quality Software Type 7698
The PULSE Application for Analysing and Improving Sound Quality
PULSE™ Sound Quality Software Type 7698 is advanced, standalone software which can record, analyse, edit and play back
binaural or monaural product sounds or other audio signals. With the
benefit of OLE automation, the software can be controlled from other
applications and provides a direct interface with the new
Psychoacoustic Test Bench software. This organises subjective and
objective tests and correlates the results into a combination metric.
Sound Quality software can record up to four channels using a four
channel sound card. It can also import signals recorded, for
example, with Portable PULSE, for sound quality evaluations in
addition to other available PULSE analysis methods.
PULSE Sound Quality software is the core of a complete sound
quality system. Add the necessary hardware and you have a complete sound quality solution.
Uses, Features and Benefits
Analysis of product sound
Editing recorded sounds to simulate product improvement
Preparing listening tests and play lists for product evaluation
Determining sound quality parameters: loudness, nonstationary loudness, binaural loudness, sharpness, fluctuation
strength, roughness and related parameters
• Visualising and editing orders on rotating machinery
• Runs under Microsoft® Windows® 2000 or XP with Microsoft®
sound system compatible sound card (up to 4 channels)
• Reads PULSE Data Recorder files
• Controls PULSE for measurements with Data Recorder or
Time Capture options
• Powerful Zwicker Loudness analysis option BZ-5265
• Order Analysis capabilities with option BZ-5277
• Subjective/Objective correlation tool with Psychoacoustic Test
Bench option BZ-5301
• Jury Test tool for designing and executing sound quality
listening tests
• Psychoacoustic correction for improved realism during
• Frequency and time domain editing of multiple signals with
real-time capability
• Displays multispectra as waterfalls, contour plots, envelopes
and slices
• Fully OLE programmable for automating routine tasks such as
analysis and reporting
• User-definable edits using Visual Basic® or Visual C++®
• User-definable macros using VBScript or JavaScript
• Performs regression analysis and creates a combination
metric with Psychoacoustic Test Bench option BZ-5301
• A complete sound quality solution
What is Sound Quality?
The sound quality of the noise from a product is of ever increasing importance when assessing the total
quality of the product. For products such as sports cars and hand tools, not only the level, but also the quality
of the noise it makes are part of what attracts or repels the customer. The right sound can lead to increased
Many factors come into play in the sound quality evaluation process. Traditional objective measuring and
analysis methods such as A-weighted sound pressure and FFT analysis are not enough for analysing
product sound. Customer expectations and jury testing are also important factors for determining acceptable
sound quality because, in the end, only the human ear can tell the designer whether he is producing the right
PULSE Sound Quality software allows you to perform objective analysis based on Zwicker Loudness. It
analyses sound much closer to the way the human ear experiences sounds. Many parameters of sound, or
metrics, can be defined and quantified with these tools to show whether aspects of sound such as
roughness and sharpness fall within an acceptable range. Used carefully, combinations of these objective
results can show good correlation with the subjective results of jury test, although they can never completely
replace them. This can save a tremendous amount of time and money in the development process.
This new version of the program runs even faster and easier, and consequently saves time. It also provides
a direct interface with the new Psychoacoustic Test Bench tool, thus ensuring a complete sound quality
The Complete Sound Quality System
Besides offering powerful tools for both objective and subjective analysis of sound quality, PULSE Sound
Quality software provides complete facilities for every other step of the sound quality evaluation and
optimisation process. From calibration, recording, and playback to editing and display, PULSE Sound
Quality software does it all.
Fig. 1
Creating reports for
Microsoft Excel with
OLE Automation
You can even customise the
software to automatically execute
operations with its extensive OLE
programmability, or with VBScript
especially useful for automating
long or involved tasks for a large
batch of measurements or files or
for creating reports containing
Zwicker Loudness and userdefined metrics for display in a
Microsoft® Excel spreadsheet.
Since PULSE Sound Quality now
controls and imports data from
the base PULSE software, you have easy access to PULSE’s multichannel recording capabilities. You can
also pre-analyse your data in real time with any of PULSE analyzers in parallel to exporting it to PULSE
Sound Quality. OLE automation allows Sound Quality to be controlled from other applications and
completely integrates Sound Quality software with the Psychoacoustic Test Bench software.
Calibration and Equalisation
In order to compare sounds recorded at different times or under different conditions and to repeat as
accurately as possible the psychoacoustic effect of a sound, it is important that you work with calibrated
signals. Type 7698 allows you to calibrate the input by using acoustic calibration signals.
When binaural signals are to be presented to listeners, the output needs to be calibrated as well. PULSE
Sound Quality software lets you adjust the output signal level for playback via headphones by placing
headphones on the Sound Quality Head and Torso Simulator Type 4100 or 4100-D. The software also
includes a weighting curve correction at both the input and the output. This has a number of fixed weightings
and also allows user-defined weightings. Using this, you can, for example, apply a frequency weighting to
the input to correct the diffuse- or free-field response of Type 4100 to a flat response, or correct the
frequency response for a specific set of headphones, e.g., Sennheiser HD 650. The audio quality is
improved using FIR filters. You can also define your own headphone correction filters.
Charge Injection Calibration (CIC)
The Sound Quality Program also allows you to use Brüel & Kjær’s patented CIC technique for calibration
checks and fault diagnosis. This method uses an electrical signal directed back to the microphone
preamplifier junction via a third cable. Information on the condition of the recording system can be obtained
by monitoring the stability of the response to this signal. If the response is unchanged the acoustic
calibration can be considered intact. Various other responses can indicate microphone diaphragm damage,
short circuits, leakage in the microphone or disconnected or broken cables.
Psychoacoustic Correction
Once you have calibrated your system, you may discover that the sound played back through headphones is
not realistic compared to the real-life situation. This can arise from the sense of the room, vibration, or even
the simple fact that you can no longer see the object making the sound. To overcome this, PULSE Sound
Quality software contains a psychoacoustic correction filter on top of the normal corrections that allows you
to alter the amplitude of the signal over the frequency range 20 Hz to 20 kHz. You can then save your userdefined filter specification when you are satisfied with the results.
Recording Sounds
Sound Quality supports four channel recording – two audio signals and two tacho signals. Using two
ZE-0770 sound cards interconnected with a synchronisation cable (included with the sound card), you can
record four channels (one binaural signal and two tacho signals). ZE-0770 A is a high-quality, 2-channel
Notebook sound card.
Fig. 2
Selecting a part of the
original recording for
editing and analysis.
You do this by either
entering the number of
seconds or by
selecting a section of
the signal using
As you are recording a sound,
the time signal is displayed on
proceeds. The sound is recorded
in a temporary .wav file on your
PC’s hard disk allowing you to
save longer time records than
would otherwise be available if
you were recording to RAM. After
recording, you can select the part
of the signal of interest. The
selected sound sample can then
be saved, including calibration
data, ready for further editing,
analysis, etc. When ready, the
part of the signal selected for
further processing is displayed in
a playback monitor in the toolbar
area. When you play the signal,
the display shows your progress
and indicates the level at every
point on a bar graph.
Recording with PULSE
Sound Quality supports recording
Recorder Type 7701 or Time
Capture Type 7705, it is possible
to record data from Portable Data
Acquisition Unit Type 2827. Type
7698 automatically controls the
PULSE system and records and
retrieves data. Time data can
also be retrieved from existing
recordings. In Sound Quality, you
can pick the signals from the
HATS and one or two tacho
signals and select the portion of
the time signal that you want to
use for analysis. Calibration
information from PULSE is saved
with the signal in Sound Quality.
Fig. 3
Recording with PULSE
Editing Sounds
Sound quality is normally used
interactively, for example in the
product design phase, to carry
out time and frequency filtering
before the signal is played back
for listening. This allows the
localisation of signal components
that are important for the
subjective impression of the
sound, or the simulation of
proposed modifications to a test
Fig. 4
The Real-time Filter
editing tool
Both time and frequency domain editing are available, as is real-time editing (see Fig. 4). Using Type 7698
and its advanced, time, and frequency cursors you can apply the following edits:
Peak Limit
Time Attenuation
Level Edit
Frequency Attenuate
Frequency Shift
Peak Limit Frequency
Harmonic Frequency Attenuate
Harmonic Frequency Shift
Harmonic Passband
Order Attenuation
Order Passband
Real-time Filter
Frequency Response Filter
User-defined Filter
The edits can be applied to a signal sequentially in any combination. Each edit sequence is displayed in the
project view as a branch of the signal tree. Within the limits imposed by your PC’s RAM, you can have any
number of signals in a project, and any number and combination of edits for each signal. You can also create
your own using Visual Basic® or Visual C++®.
The cursor readings can be customised using ActiveX™. Metrics, special calculations or combinations of
standard metrics can easily be tested and require only minor coding in Visual Basic.
Real-time Editing
The Real-time Filter lets you change filter parameters while listening to the result. This makes it easy to find
characteristics of the sound and alter it.
Analysing Sound Quality
Subjective Listening Tests
Subjective listening tests are vital for assessing a product’s competitiveness. The final evaluation of the
sound quality of a product is normally made using a group, or jury, representing the targeted customer
group, in a listening test.
For example, for a jury to listen to the sound in a car prototype, ideally, each jury member would have to
drive in the car and then report on the sound quality – a time consuming and expensive process. To
overcome this, a binaural head, such as the Brüel & Kjær Head and Torso Simulator Type 4100 can be used
as a stand-in for a human being to make a high-quality binaural recording of the specified product sounds
directly to the hard disk of a computer or a DAT recorder. Headphones are then used to present the
recording in parallel to all members of the jury off-site. The new Psychoacoustic Test Bench option makes
the setup and control of these subjective jury tests very easy.
Control of the Jury Test tool is fast and easy. It allows you to design and execute jury tests by arranging wave
files in a play list. You can create two specific types of tests. One is the Semantic Differential test, in which
each recording is rated on an absolute scale. The other is a Paired Comparison test (Fig. 5). Delays may be
inserted before and after the recordings to allow the jury time to form an opinion. There is full and automatic
integration with Psychoacoustic Test Bench with dedicated user interfaces.
Fig. 5
PULSE Sound Quality
software’s Play List
allows you to design
and execute jury tests
Fig. 5 is an example of a Paired
Comparison test, in which
recordings are paired together.
The jury decides which sound it
inserted between the pairs to
announce, for example, test
object identification or number.
Objective Measurements – Zwicker Loudness Option BZ-5265
Zwicker Loudness is the most
important tool for objectively
parameters, or metrics.
Fig. 6
The PULSE Sound
Quality software’s
Zwicker Loudness
option BZ-5265 adds
the ability to calculate
and analyse
It attempts to understand how the
human ear experiences sounds
different parts of the sound
signal. Sound Quality’s Zwicker
metrics for both stationary and
non-stationary sounds.
The Zwicker Loudness-based options include:
Loudness Averaged Spectrum
Loudness Waterfall Spectrum
Loudness Contour Spectrum
Total Loudness vs. Time
Instantaneous Loudness vs. Time
Statistical Instantaneous Loudness
Sharpness vs. Time
Specific Roughness
Specific Fluctuation Strength
All of the above can also be displayed for binaural loudness.
Other sound quality parameters can be determined through FFT analysis. These include the tone-to-noise
ratio, prominence ratio and RMS of time and frequency data.
Viewing the Results
You can choose to display a signal as a time graph, a spectrum or multispectrum on a frequency scale or
psychoacoustic Bark scale. Multispectra can be displayed as contour plots, 3D plots, slices and envelopes.
All of these can be displayed simultaneously. PULSE Sound Quality software offers a huge range of axis
settings and cursor values for display with graphs.
Fig. 7
Specific Loudness
waterfall graph with
read-out of sound
quality parameters.
Note the list of cursor
values to the right of
the display. PULSE
Sound Quality software
has a very extensive
set of cursor values to
choose from
You can also display a multiple graph to allow easy comparison of data. The graph could, for example,
display the FFT of all signals in a project or the results of different edits applied to the same signal.
Exporting Data
For report generation or further post-processing using a word processor or spreadsheet, data can be
exported in ASCII format or via the clipboard. Sound signals can be exported with all calibration information
as Windows®-compatible .wav files. You can also export data to other analysis applications in Universal File
On-line Help
The software is fully documented with both context-sensitive help, an on-line manual and a glossary.
Sound Quality on Rotating Machinery – Order Analysis Option BZ-5277
Fig. 8
Plots of A-weighted
Level, Specific
Loudness and Total
Loudness as functions
of RPM
The Order Analysis Option for
PULSE Sound Quality software
lets you perform sound qualitybased order analysis on rotating
machinery, even when the speed
is not constant.
The order analysis option adds
supplement the two existing
sound channels. Data for the
tacho channels may either be
directly measured, transferred
from a digital recorder or
imported from files, for example,
from the base PULSE software.
When transferred from a two
channel digital recorder, the
tacho signal may either be taken
from one of the channels leaving
the other for acoustic input. The software can also read signals with the 16th bit of one or both acoustic
channels as a digital tacho. If the file format permits (for example UFF or multitrack wave), two sound
channels and two tacho channels may be selected.
The order analysis option also adds order-related display and analysis functions to allow detection and
quantification of order related signals from the sound channels. Order edits attenuate or filter out specific
orders or sets of orders for troubleshooting or simulation of design changes.
Combined with Zwicker Loudness Option BZ-5265, the order analysis option lets you display Loudness,
Roughness, Fluctuation Strength, and A-weighted and Linear levels as functions of RPM.
Psychoacoustic Test Bench Option BZ-5301
Psychoacoustic Test Bench is an advanced option which can be run as an addition to Sound Quality. It
controls the specific objective tests (metrics) carried out by Sound Quality and also implements the two
subjective test methods – Paired Comparison and Semantic Differential. For a set of sound files in .wav
format, Psychoacoustic Test Bench will calculate a sound model (a formula for a combination metric) using
regression analysis by correlating the subjective and objective tests, thus completing the sound quality
Subjective Tests
For each subjective test session a corresponding user-defined playlist and jury answer form are produced.
Multiple jury preference/voting can be collected using the Internet/Intranet and then saved in an Excel
worksheet. The program provides a fully detailed report score sheet for each jury session and saves the
HTMLs, playlists and Excel worksheets. The user can carry out as many subjective tests as required and
new worksheets are assigned to each.
Fig. 9
Project view and user
selected metrics
Objective Tests
The objective test tool calculates
the user selected metrics for
specified wave files in the project
input view. The loudness analysis
parameters are set from Type
The test results are placed in an
Excel worksheet. The saved data
includes wave file and metrics
names, loudness settings, and
the objective metric values. If the
sound is binaural, both left and
right channel values can be
calculated, and displayed both
individually and as a mean, and
Statistical Analysis
The statistical analysis function calculates the correlation between the objective and subjective tests. It is
carried out by an advanced Excel function which calculates the optimal straight line estimate for a given set
of input and output values.
Fig. 10
The statistical analysis
calculation showing
the plots and graphs
displayed in an Excel
calculation provides an automatic
search facility using regression
analysis to find and calculate the
test model − the final combination
metric −
preselected number of metrics. It
compares the predicted values
from the model to the actual
results from the subjective
combination metric can be used
as a user-defined cursor reading
in the Sound Quality program,
making it possible to evaluate
any signal against the model very
Specifications – PULSE Sound Quality Software Type 7698
• 2 channels (+ 2 tacho channels with BZ-5277)
• Analog or Digital
• Tacho can be read from a 16th-bit encoding or normal encoded
• Direct recording with PULSE and Time Capture or Data Recorder
• Loading of time data from existing PULSE projects and recorder files
• Overall Levels: RMS, Statistics, Metric Statistics
• Statistical Regression Analysis (with BZ-5301)
• Envelope
• Stationary Loudness (according to DIN 45 631/ISO 532B)
• Non-stationary Loudness (according to Zwicker Loudness)
• Binaural Louness
• Loudness
• Sharpness
• Roughness
• Fluctuation Strength
• Tone-to-noise ratio (according to ANSI S1.13−1995)
• Prominence ratio (according to ANSI S1.13−1995)
• A, B, C, D weighting
• User-defined cursor readings
• Peak Limit
• Time Attenuate
• Level Edit, +/– 20 dB
• Demodulation
• Frequency Attenuate
• Frequency Shift
• Passband
• Peak Limit Frequency
• Harmonic Frequency Attenuate
• Harmonic Frequency Shift
• Harmonic Passband
• Generator
• Mixer
• Real-time Filter
• Frequency Response Filter
• User-defined Filter
• Real-time playback monitor
• Time (Lin/Lin, Log/Lin, Lin/Log, Log/Log, Waterfall, Contour)
• Single Signal or Multiple Signal Graphs
• Schmitt trigger of tacho signals
• RPM extraction from tacho signals
• FFT analysis of sound signal using RPM signal to determine orders
• Order Attenuate
position specified by order start and width attenuation in dB or absolute
• Order Passband
position specified by order start and width stop-band gain in dB or
• Time graphs:
Schmitt triggered tacho
• FFT Contour versus RPM
• FFT Waterfall versus RPM
with Zwicker Loudness Metrics (with BZ-5265)
• Loudness versus RPM
• Roughness versus RPM
• Fluctuation Strength versus RPM
• Controls Type 7698 from an Excel spreadsheet
• Set up of calculation of objective metrics for wave signals
• Set up of subjective tests and evaluation of results from jury members
• Remote jury tests using Internet
• Regression analysis for calculation of combination metrics
• Input (Flat, 4100 diffuse-field, 4100 free-field or user-defined)
• Output (Flat, HT 0012, HT 0017 or user-defined)
• Input level
• Output level
• Charge Injection Calibration
• OLE 2 interface
• Programmable from e.g., Visual Basic®, Visual C++®, Microsoft®
Excel, Microsoft® Word
• VBScript, JavaScript
Import and export of multichannel external file formats: HDF/DAT –
HEAD Acoustics ArtemiS format. Support for both 16- and 24-bit data
(Note: In 16-bit format, the tachometer information is embedded in the
LSB of the left channel). MATLAB time format – contains no calibration
Data Export
• .WAV (wave file)
• .TXT (ASCII text file)
• Universal File Format (UFF)
Data Import
• .WAV (wave file)
• Universal File Format (UFF)
• Import from base PULSE software – requires that either Data Recorder
Type 7701 or Time Capture Type 7705 is installed on PULSE computer.
Support of 24-bit DAT files from Type 7701
• Single or repeated
• Calibrated or uncalibrated
• Synchronised (original vs. edited)
• Test methods supported: Paired Comparison, Semantic Differential
• Voice annotation
• User-defined delays
• Play List
• On-line, context-sensitive Help and User Manual
Specifications – Power Amplifier ZE-0769 (optional headphone amplifier)
Type: bridging, balanced/unbalanced, transformerless
Input Impedance: 10 kΩ each leg
Maximum Input Level: +18 dBu
Connector: 3-conductor ¼″ (tip-ring-sleeve)
Power: yellow LED indicates power “on”
Frequency Response: 20 Hz to 20 kHz, +0 dB, –1 dB
THD: 0.01% (1 kHz, 0 dBm, 600 Ω)
0.02% (1 kHz, +24 dBm, 600 Ω)
Signal-to-Noise Ratio: 95 dB
Gain: –30 to 0 dB in 6 dB steps
Type: low-Z
Output Impedance: 60 Ω
Maximum Output Level: >50 V p-p into 2000 Ω
Connectors: ¼″ (×4)
16 V AC, 200 mA (power supply, included)
Specifications – Headphones HT- 0017 (optional)
Nominal Impedance: 300 Ω
Contact Pressure: approximately 2.5 N
Weight (without cable): approximately 260 g (9 oz.)
Jack Plug: 6.5/3.5 mm stereo
Transducer Principle: open, dynamic
Ear Coupling: Circumaural
Cable Length: 3 m (10 ft.)
Frequency Response: 10 to 39500 Hz
Sound Pressure Level: 103 dB (1 V RMS)
THD: 0.05%
Ordering Information
Type 7698-X*
Quality Zwicker Loudness
Quality Order Analysis
Quality Psychoacoustic Test Bench
Type 3050-A-040 4-ch. Input Module LAN-XI 51.2 kHz (Mic, CCLD, V)
Type 7708-X
PULSE Time Data Recorder
Type 7698-X
PULSE Sound Quality
PULSE Sound Quality Zwicker Loudness
Type 7700-X2
PULSE FFT & CPB Analysis, 2-channel License:
– Gives you the possibility to control the recording from inside Type 7698
using the PULSE Recorder
– Gives you the possibility to analyse the recordings in PULSE LabShop
System Requirements
• Gen Intel® Core™ i7 3 GHz processor, or better
• 8 GB RAM
• 250 GB Solid State Drive (SSD) with 20 GB free space, or better
• DVD-RW drive
X Specifies license: N for node locked, F for floating
Optional to the ordering information FOR DATA RECORDING USING TIME
• 1 Gbit Ethernet network
• Microsoft® Windows® 8.1 Pro (x64), Windows® 7 SP1 (x32 and x64) or
Windows® XP Professional (SP3)
• Microsoft® Office 2007 (SP2), Office 2010 (SP2) (x32) or Office 2013 (x32)
• Adobe® Reader® 11.0 (US version included on DVD)
• Microsoft® SQL Server® 2008 R2 Express Edition (SP 1) (included with
• Sound Card (see Optional Accessories)
Optional Accessories
Type 4100
Sound Quality Head and Torso Simulator
(Preamplifiers: Type 2669-L with charge injection
calibration facility)
Type 4100-D
Sound Quality Head and Torso Simulator
(Preamplifiers: DeltaTron® Type 2671)
Type 2672
Sound Quality Conditioning Amplifier
Positioning Frame for Types 4100 (D) and 2672
Sennheiser HD 650 Headphones
Headphone Amplifier, including JP 0352 and
2 × AO-1459
ZE-0770-A-001 PCMCIA Sound Card
Stereo Jack Plug – 2 × BNC male cable (1 m)
Mono Jack Plug – BNC male cable (1 m)
Stereo Jack Plug – Stereo Minijack Adaptor
Type 4101
Binaural Microphone
Type 4101-A
Binaural Microphone with TEDS
PULSE Sound Quality
Software 7698-X*
Zwicker Loudness
Option BZ 5265-X*
Time Data
Recorder 7708
Order Analysis Option
BZ 5277-X*
Psychoacoustic Test Bench
Option BZ 5301-X*
Power Amplifier
Optional PULSE FFT & CPB Analysis
2-channel License 7700-X2
Microsoft, Windows, Visual Basic and Visual C++ are registered trademarks and ActiveX is a trademark of Microsoft Corporation in the United States and/or other
countries · SONY is a registered trademark of Sony Corporation · Pentium is a registered trademark of Intel Corporation or its subsidiaries in the United States and/
or other countries · MATLAB is a registered trademark of The MathWorks, Inc.
Brüel & Kjær reserves the right to change specifications and accessories without notice
HEADQUARTERS: Brüel & Kjær Sound & Vibration Measurement A/S · DK-2850 Nærum · Denmark
Telephone: +45 7741 2000 · Fax: +45 4580 1405 · www.bksv.com · info@bksv.com
Local representatives and service organisations worldwide
BP 1589 – 22
* X Specifies license: N for node locked, F for floating
Sound Quality
Head and Torso
Simulator 4100 or 4100-D