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| Desktop Software |
|
 dB-Lab |
Specification |
|
runs on: USB Dongle, DA2, PM8 |
| dB-Lab integrates all software modules in a common
environment. |
- Project-oriented Microsoft Windows application
- Hosts measurement and simulation modules
- Configure Modules
- Template based HTML-report generator
- Scalable database for setups and results
|
 |
|
| Software Modules
for the Distortion Analyzer hardware |
|
| LSI -
Large Signal Identification |
Specification |
|
runs on: DA2 |
| LSI identifies the nonlinear and thermal parameters of a
transducer. |
| Features |
Benefits |
- Nonlinear and thermal parameters
- Instantaneous state variables (x, Tv, P, ...)
- Dynamic measurement under normal conditions
- Distortion analysis
|
- Measure the causes of distortion
- Find and fix driver defects
- Adjust coil and suspension
- Optimize size, weight, output, distortion
- Assess maximal output
|
| LSI comes in 3 modules: |
|
| LSI WOOFER:
|
|
- low frequency drivers (fs< 400 Hz)
- woofers
- headphones
- shakers
- other electro-dynamical transducer where the mechanical-acoustical
part can be modeled by a 2nd-order system (moving mass, compliance,
damping)
|
| LSI TWEETER: |
|
- tweeters
- horn drivers
- micro-speakers (telecommunication ...)
- other electro-dynamical transducer with high resonance frequency
(100 < fs < 4 kHz)
where
the mechanical-acoustical part can be modeled by a 2nd-order system
(moving mass, compliance, damping
|
| LSI BOX: |
|
- includes functionality of the LSI WOOFER
- plus drivers mounted in sealed or vented enclosure
- any other electro-dynamical transducer coupled with an additional
resonator (e.g. bandpass, horn, panel) giving a 4th-order
mechanical-acoustical system.
- also dedicated for low-frequency drivers (fs < 400 Hz)
- recommended for systems without crossover
|
|
| LPM -
Linear Parameter Measurement |
Specification |
|
runs on: DA2 |
| LPM measures the small signal parameters and the creep of the
suspension. Using the optional laser head dispenses with additional mass or
enclosure. |
| Features |
Benefits |
- Linear transducer parameters + creep
- Curve-fitting in impedance and displacement
- Direct identification using a laser
- Result validity check
|
- Get reliable, and reproducible data
- Speed up with one-step measurements
- Examine dependency on amplitude
- Measure at extremely small amplitudes
|
|
| TRF -
Transfer Function |
Specification |
|
runs on: DA2 |
| Determines transfer function and harmonic distortion in one
fast measurement |
| Features |
Benefits |
- Fast two-channel data acquisition (<43.6 kHz) with noise monitoring
- Automatic SPL calibration
- Adjustable Stimulus: bandwidth, spectrum, crest factor
- Impulse response and energy-time-curve (ETC)
- Quasi-anechoic measurement
- Time delay, minimal phase, and group delay
- Cumulative Spectral Decay (CSD) and Sonograph
|
- Measure linear transfer function and harmonic distortions simultanously
- Combines linear and nonlinear measurement
- Measure quickly at high signal-to-noise ratio
- Adjust stimulus to transducer
- Investigate transient behavior
|
|
| TRF
Pro -
Transfer Function Pro |
Specification |
|
runs on: DA2 |
|
| Features |
|
- Detection of low energy, impulsive disturbances (clicks, rub & buzz,
etc.)
- Full temporal fine structure of distortion(contrary to Fourier
Analysis)
- Reveals short-time disturbances of much lower level than traditional
methods
- Applicable to Speakers and Electronics
- Simple interpretation
|
- Separation from ambient noise
- 3D representation reveals location and physical cause of disturbance
- Uses active Compensation technique for revealing defects
- Measures deviation (impulsive and regular) from a “golden unit”
- Full TRF (standard) features
|
|
| SIM
2-
Simulation Version 2 |
Specification |
|
runs on: USB Dongle, DA2 |
| The SIM module predicts the large signal behavior of a driver
mounted in a vented, sealed or bandpass enclosure, based on the parameters identified
using the LSI. |
| Features |
|
- Numerical exploration of large signal behavior of speaker systems
- Considers nonlinearities in driver, enclosure and radiation
- Nonlinear parameters can be easily manipulated with an professional
curve editor
- Vented, sealed box, passive radiator, bandpass and general enclosure
- Incorporates crossover, cone, radiation and room frequency response
- Sophisticated nonlinear thermal model that considers air forced
convection cooling
- Two-tone excitation signal
- Available for Dongle or Distortion Analyzer hardware
|
- Calculates electrical, mechanical and acoustic state signals (waveform
and spectrum)
- Calculates voice coil, gap and magnet temperature
- Shows results versus frequency and voltage
- Reveals the large signal mechanism in detail
- Separates the effects of the individual nonlinearities
- Finds dominant sources of distortion
- Determines maximal output
- Shows mechanical and thermal load
- Helps to improve performance/cost ratio
- Saves time and cost in prototyping.
|
|
| DIS -
3D Distortion Measurement |
Specification |
|
runs on: DA2 |
| Measures fundamental, harmonic, intermodulation vs. frequency
and amplitude |
| Features |
Benefits |
- Measures harmonic and intermodulation distortion
- Measures DC component of displacement
- Thermal and mechanical protection
- Interface and result corresponds to simulation
- Dual channel acquisition up to 43.6 kHz
|
- Assess large signal behavior
- Check amplitude compression
- Evaluate stability of transducer
|
|
| AUR -
Auralization |
Specification |
|
runs on: DA2 |
| Makes speaker distortion audible for subjective evaluation
and correlates the subjecte performance with objective parameters |
| Features |
Benefits |
- Digital woofer simulation in real time
- Separation of nonlinearities
- Arbitrary input signals (music, test signal)
- Blind or open A/B-listening test
|
- Investigate impact on sound quality
- Combine subjective and objective evaluation
- Listen to separated distortion components
- Match targets in marketing and engineering
- Non-desctructive testing
|
|
| PWT -
Power Test |
Specification |
|
runs on: DA2, PM8 |
|
| Features |
Benefits |
- Long term testing with parameter monitoring
- Reports mechanical and thermal load
- Internal signal generator
- External signal applicable
- Control of amplitude and cycle scheme
- Death report
|
- Analyze cause of desctruction
- Perform systematic long-term tests
- Find initial and consequential damages
- Measure and specify limits of the transducer
- Ensure robust and reliable products
|
|
| MAT -
Math Processing |
Specification |
|
runs on: USB Dongle, DA2 |
|
| Features |
|
- Implement your own ideas
- Write flexible, powerful scripts
- Exploit MatLab / Scilab
- Hide math in a container
- Available for Dongle or Distortion Analyzer hardware
|
- Create tools usable for everyone
- Extend dB-Lab functionality
- Share tools with coworkers
|
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R+D System