NTi Audio PureSound Specifications
PRODUCT DATA
PureSound
SPEAKER TEST SYSTEM
Key features for a modern, state-of-the-art test system are speed, simplicity, reproducibility and
automation in a factory environment. The PureSound speaker test system exactly answers these
needs. The key element is the unique Rub & Buzz defects analysis with a 100% correlation to the
human ear. It replaces the subjective human ear perception against an objective, reliable and repeatable test feature.
The PureSound speaker test system is based on the FX100 Audio Analyzer, operated via the PCbased turnkey production software RT-Speaker. It is tailored for the total quality control of single
components, pre-assembled parts or finished products.
Key Features:
• Speed: Cycle time down to 1 second based on speaker
type.
• Accuracy: The FX100 Audio Analyzer is based on reliable technologies providing accurate and consistent test
results.
• Rub&Buzz: Superior Rub&Buzz defects detection with a
100% correlation to the human ear. Objective Rub&Buzz
testing replaces subjective golden ears.
• Noise Immunity: Maximum performance in noisy production environment using dedicated technologies.
• System Integration: Tailored for automated production
lines with PLC interface, barcode reader or remote control via TCP/IP commands; offering full data logging and
statistics (e.g. Cpk, Ppk).
• Multi-Channel Operation: Testing two DUTs in parallel or
multiple DUTs sequentially without any operator interaction.
Multimedia speaker testing
Mobile Devices
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PRODUCT DATA
INTRODUCTION
Electro-acoustical transducers naturally bear a particularly high error rate. Sorting out faulty devices
in an early production stage increases the overall yield and reduces the cost of waste material and
optimizes the quality of the manufactured goods. The FX100 Audio Analyzer and the production
software RT-Speaker form together the PureSound Speaker Test System comprising exactly the
required features for quality control and production line testing.
Basic Speaker Test Configuration
Test Functions:
• Frequency Response
• Sound Pressure Level dBSPL
• Rub & Buzz analysis with100% correlation to the human ear
• Impedance Response & Resonance Frequencies
• Distortion THD, THD+N, 2nd - 35th harmonics
• Speaker Polarities
• Thiele/Small Parameters
• DC Resistance
PureSound detects any audible manufacturing flaws of speakers or transducers, such as air-leaks,
misaligned coils, rubbing voice coils, loose particles, touching wires etc.
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PRODUCT DATA
SIMPLE AND INTUITIVE OPERATION
The PureSound speaker test system is setup and configured within a few minutes. The FX100 Audio
Analyzer communicates with the PC-software RT-Speaker via the USB interface. RT-Speaker provides an intuitive user interface for test setup and display of all measurement results.
The main menu guides the production administrator through the basic system configuration on to
the test parameter settings, which are contained in a single “Project“ folder. After an automated calibration sequence the reference measurements can be recorded, tolerances automatically calculated
and the Production Mode started. The RT-Speaker software provides a simple PASSED/FAILED
readout or a detailed view of all measured speaker parameters.
PC-Software RT-Speaker
The key element is the Rub&Buzz test technology with a unique and reliable defects analysis. The
cycle time may be set down to 1.0 second (based on the speaker type) for a complete test including
the outstanding Rub&Buzz analysis.
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PRODUCT DATA
UNIQUE RUB & BUZZ TEST IN TIME DOMAIN
The patented measurement technology enables the PureSound speaker test system to conduct fast
and reliable Rub&Buzz tests with a perfect equivalence to the human “Golden Ear”.
TECHNOLOGY:
Gliding chirp triggers
all frequencies
The measured signal is first processed with a filter bank, simulating the psycho-acoustic perception of the human ear. Then
the Transient Steepness Analysis is carried out by differentiation and rectifying the time signal. The result displays all sound
energy changes audible to the human ear.
PureSound filters
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100% CORRELATION TO HUMAN EAR
The NTi Audio Rub & Buzz test technology is the outstanding approach for perceptual audio testing in the time domain. The algorithms model the human ear
as a transient analyzer, effectively measuring every audible manufacturing imperfection with an unmatched correlation to the acuity of “Golden Ears” – “You
measure what you hear”. This correlation allows cost saving and much improved
test accuracy by replacing the subjective “Golden Ear“ with a successful and
objective Rub & Buzz test.
In the past “Golden Ear“ tests have been carried out based on the judgment of
individual persons, which may even vary over time as the human ears tire during
the day. PureSound offers a 100% repeatable, objective Rub&Buzz test at any
location around the globe.
PRODUCTION NOISE IMMUNITY
PRODUCT DATA
PureSound measures Rub&Buzz even in noisy factory environments. An effective, advanced noise cancellation algorithm eliminates non-correlating signal
components from the test signal, thus immunizing the measurement process
against factory noise. The typical test time is one second.
Rub & Buzz analysis: Loose particles
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PRODUCT DATA
Rub & Buzz analysis: Rubbing voicecoil
DETECTING SLIGHTEST RUB & BUZZ DEFECTS
PureSound provides a complete speaker or transducer characterization, detecting even the most subtle manufacturing flaws of speakers or transducers,
such as air-leaks, misaligned coils, rubbing voice coils, loose particles, touching
wires or defects from any other cause, also supporting the automatic qualification of the nature of these defects.
PURESOUND IN R&D
PureSound acquires “fingerprints” of speaker non-linearity’s to compare developments in every design stage over its entire life. Such a continuous Rub &
Buzz measurement monitors the objective quantification of design changes to
audible effects, minimizing design flaws. As lower the measured Rub & Buzz
is in the development stage as better are the test results of the final product.
Furthermore in the supplier selection process different speaker-samples can be
compared against each other in order to choose the sample with lowest Rub &
Buzz for the final product.
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