noiseLAB 4.0 Now Shipping

noiseLAB 4.0 is now shipping.

Featuring a complete re-design, with focus on simpler workflow, faster and more accurate calibration, and a new, high-performance editor.


In addition, new functions include vibration measurements, sound quality metrics, and the Nordic Impulse detection method.

noiseLAB 4.0 consists of two programs:

  • noiseLAB Capture, for recording or import of .wav files, editing, and basic noise analysis functions: Sound Level, Ln, 1/N Octave and FFT Spectrum Analysis.
  • noiseLAB Batch for advanced analysis, including tone and impulse analysis, sound quality metrics, and vibration analysis and time slice analysis.

noiseLAB 4.0 is available in three editions:

  • Standard
  • Advanced
  • Professional

noiseLAB 4.0 Data Sheet

If you already own one of these editions for noiseLAB 3.0, your existing license gives you a free upgrade to noiseLAB 4.0.

To download the free demo, which also can be unlocked by valid license keys, click here:

noiseLAB download.

To purchase noiseLAB contact DELTA or one of our distributors.

Pricing of noiseLAB 4.0 remains the same a previous versions.

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noiseLAB and noiseLAB Wind at noiseCON Sept 7-10 in Fort Lauderdale

noiseLAB 4.0 (noiseLAB Pro) along with noiseLAB Wind will be featured at the Scantek stand at Noise-Con 2014. in Fort Lauderdale, Florida.

At the same time, noiseLAB 4.0 will be shipping (as a download on September 8) as a free upgrade for existing customers.  Attendees at Noise-Con are invited to a special individual demo of both noiseLAB and noiseLAB Wind at the show.

To book a time, contact the personnel at the Scantek stand, or email  Carsten Thomsen at cth at

A 10% show discount is available for all participants in the individual demo.

We invite you to see how DELTA’s many years of acoustics and noise experience is leveraged in these two new products, including our in-depth experience in wind turbine noise measurements and standardization.

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The flexibility of noiseLAB Pro 4.0

noiseLAB 4.0 Data Flow

noiseLAB 4.0 consists of two programs

  • “noiseLAB Capture” for data acquisition, recording, and Editing
  • “noiseLAB Batch” for analysis of large batches of Recordings or edited Clips.

noiseLAB uses open data formats and can interface to a wide range of data types.


noiseLAB Capture accepts waveforms from:

  • National Instruments DSA Digitizers with IEPE transducer powering. This gives you plug-and-play configuration and a fully documented signal path.
  • Internal and external sound cards
  • .wav files from hard disk recorders, sound level meters, and other sources.
  • TDMS waveform files recorded by noiseLAB itself, or noiseLAB Wind. This gives you flexibility in analyzing files from other noiseLAB projects or noiseLAB Wind Recordings.

noiseLAB Capture can export waveforms in:

  • TMDS waveform format, with complete metadata annotation.  These files can be read by LabVIEW, Excel Plugins and others packages.  The format is fully documented by National Instruments.
  • .wav files.  Recordings or Clips from noiseLAB Capture can be output in scaled format to optimize dynamic range of the resulting files. The relative level of the individual files is retained.

noiseLAB Batch provides for advanced analysis (FFT, Octave, Tone or Impulse Analysis, Sound Quality, Vibration etc.) of multiple Recordings or Clips. Input data sources include:

  • Recordings from noiseLAB Capture
  • Recordings from noiseLAB 3.0
  • FFT Spectra for subsequent IEC 1996 Tone Analysis from
    • Delimited FFT files in a variety of formats
    • from noiseLAB 3.0
    • from noiseLAB Batch 4.0
    • noiseLAB Wind

noiseLAB Batch can output results as:

  • Tables of Results for each analysis type in delimited format easily parsed by Excel or other applictions.
  • jpg graphs of the result(s). For Time Slice analysis, graphs of multiple slices are automatically output in one operation.

This flexibility means noiseLAB makes it possible for you to interface to virtually any source of signals and output data in a range of popular and open formats.

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noiseLAB 4.0 Release Candidate 3 available

Release candidate 3 of noiseLAB 4.0 is now available. It consists of two downloads:

  • noiseLAB Capture for wave file import, data acquisition, and editing of sound files.
  • noiseLAB Batch Processor for advanced analysis of files from noiseLAB Capture. Includes vibration analysis and sound quality metrics.

These Release Candidates will be subjected to certification testing, and when completed  will officially be released.

The products reflect extensive testing and performance improvements.

Important compatibility notes (only relevant for users who have used previous Release Candidates RC01 and RC02):

  • RC03 sound files and project files are not compatible with earlier release candidates.
  • Therefore if you want to keep these files, move the main folder containing earlier projects to a different location or rename it.  Otherwise you existing files may be overwritten.
  • To be able to process these files, you should not uninstall RC02.

The Release Candidates contain the full functionality of the full edition of noiseLAB and Expire October 31, 2014.

The files are available for download here 


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Recent Wind Turbine Noise Presentations

In January and March, 2014, DELTA has presented four papers related to noise measurement on Wind Turbines.

At the Wind Turbine Acoustic Day on January 24, 2014

and at the Danish Wind Industry Annual Event 2014

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noiseLAB Release Candidate 2 Available

Updated April 29, 2014

The new noiseLAB Pro Family consists of two programs:

  • noiseLAB Capture for Data Acquisition, wave import, editing, and basic signal analysis.
  • noiseLAB Batch for advanced analysis, including tone and impulse analysis, psychoacoustic metrics, and vibration.

The release candidates (RC2) for noiseLAB Capture and noiseLAB Batch are now available for download.

The preliminary Users Guide is available noiseLAB 4.0 Users Guide0.8


  • noiseLAB Capture RC02 is not compatible with previous versions of noiseLAB Capture or noiseLAB Express.
  • noiseLAB Batch RC02 is compatbile with noiseLAB 3.0.17 (.nlp project files) and with noiseLAB Capture RC02 (.nlrc project files)

For best performance we recommend Windows 7 or above with 8 GByte RAM og 256 M Solid Stateddisk.  However, the programs will run on Windows XP Service Pack 2 through Windows 8.  Loading and performance will be slower on older machines.

Extensive online help is available by clicking or right clicking on the DELTA Logo and ? in the upper right corner of the screen.

You can download the Release Candidates from here.

The new noiseLAB Programs will be numbered as version 4.0

We welcome your feedback and questions at

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Major new features in noiseLAB Pro

noiseLAB Pro is a major upgrade of noiseLAB with greatly improved usability and new measurement functions.

noiseLAB provides a completely re-designed front end for one-click import, calibration and editing, plus support of a wider range of National Instruments data acquisition devices.

Load and editing performance for long files is significantly improved.

“Scrubbing” lets you view the FFT or octave spectra while dragging your cursor through the waveform.

Editing is performed with a single click-drag-release gesture, and can be fine tuned using numerical entry. Created Clips can be renamed and measurement annotation can be added, including links to picture or video files.  Each Clip is clearly indicated on screen in the associated recording.TotalFP with Clips

Increased dynamic range of the built in volume control overcomes the limitations of Windows native volume control, letting you listen to signals from low level wind turbine noise, to high volume jet engines.

New measurement functions in the associated Batch Processor will include vibration, Sound Quality, and the Joint Nordic Impulse method.

noiseLAB Pro is compatible with Windows XP Service Pack 2 through Windows 8.

An overview of the entire noiseLAB Family is available here.

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noiseLAB Wind: System Overview

Data Flow for Wind Turbine


noiseLAB Wind provides a number of open data interfaces that gives greater flexibility and interoperability with third party tools.

The above diagram shows the major data flow paths in the system, and some of the major data formats used.  In the following these will be described in detail.

Microphone Inputs

IEPE powering is provided by National Instruments NI USB 9234 and other NI DSA compatible modules.  The USB 9234 can be powered from the USB port of a laptop computer with only a minor decrease of battery life. The USB 9234 can provide power for up to four microphones. However, microphone preamps with built-in gain, such as the GRAS 26CF require more power, and hence only two of these can be connected to each USB 9234.   Analog cable lengths of  up to 200 m from microphone pre-amp to the USB 9234 are possible without signal degradation due to cable length.

Meteorology inputs

Data from Met masts can include wind speed, direction, temperature, pressure and humidity.  noiseLAB Wind can handle all of these in analog form with AC or DC voltages from 0 to +-10 V using the NI USB 9215A. The 9215A is powered from a USB port of a computer.  The 9215A samples up to 100 kS/s per channel, and the noiseLAB Wind Software provides user settable gain and offset on a per-channel basis.  In addition, for frequency proportional outputs (typically seen from anemometers), software in noiseLAB Wind converts this to wind speed units.

Selected meteorology masts with RS-232 outputs are also supported.  Contact DELTA for more details.

Power curve and correction curves

The Wind turbine power curve and wind shield correction curves as entered into the system from well-defined delimited text files.

Wind Turbine Parameters

Wind turbines can output a number of parameters, either by analog or digital interface.  These parameters can include power output, RPM, Pitch, Yaw, Nacelle Wind Speed, etc.

When these are available in analog form, up to four of these can be digitized by each NI USB9215A.  Each channel provides user settable gain and offset.

For digital outputs, DELTA provides standard RS-232 drivers for a range of Vestas and Siemens Turbines.

The turbine parameters are typically sampled at 10 samples per second, and averaged in software to give one second averages.

noiseLAB Wind Data Acquisition Software

This software runs on the data acquisition computer which receives data from the above mentioned devices via USB or RS-232 ports.  Wi-fi or cabled Ethernet can also be used to connect to the USB devices, which are placed in an Ethernet Adapter cradle to enable networking these.  To give more robust operation, each device is assigned a fixed IP address. Cabled Ethernet is recommended in uncontrolled environments such as residential areas where risk of mechanical or electrical interference are higher.

Acoustic Processing

The digitized microphone signals (24 bits resolution) are converted to 32 bit single precision floating point for internal storage.  For each microphone channel the following is computed and stored to disk in user selectable time slices (typically 10 s or 60 s): LAeq, ⅓ octave Sound Level, A-weighted ⅓ octave sound level, and FFT spectra. All of the above are averaged using linear RMS integration.

Wind Turbine and Met signal processing

The incoming signals are sampled at 10 S/s, and averaged to 1 second values, which are recorded on disk as time domain waveforms. In addition, these are processed into time slices, typically 10 or 60 seconds.

Raw waveform storage

The raw time domain waveforms are stored in the National Instruments TDMS format. This format lets your PC serve as a multi-channel “tape recorder” where high numbers of channels can be stored with individual sampling frequencies per channel.  Data is time stamped with a 128-bit time stamp. In addition, meta data related to the measurement is also stored in the recording.  Recording duration is limited only by disk size, since the sample counter in TDMS is a 64 bit integer.

The TDMS format is open, and data can be read from a broad range of software including LabVIEW, C, .net languages, MatLab, Excel, Open Office, and Diadem, a powerful data explorer package.

Result Data storage

All data is written to disk in as simple as possible a file format which only appends to disk files, thus making files more robust in terms of recovery from crashes.

Time domain data is written in the TDMS format as described above.

Acoustic results(except FTT), Met and Turbine data are written to a delimited text file in the user-selectable time slices (typically 10 or 60 s). This is a temporary file which is converted to Excel at the end of the measurement.

FFT time sliced spectra are stored in a separate delimited text file.

The text delimited files are self-documenting with clear labels and axes.

User entered data

noiseLAB Wind provides a time coherent data collection system.  However, for some applications, it may be desired to input parameters from different devices, such as autonomous data loggers.  This can be done after the measurements are complete, by taking the external data, ensuring that it is time-aligned with the data in the above spreadsheets, and copying it into the spreadsheet. Likewise, FFT spectra can be copied into the FFT spectrum file.  In these cases, the user is responsible for time alignment and calibration integrity of these data.

.wav file inputs

For round robin testing and other applications, it may be useful to input .wav files into the system.  This is done by importing the .wav files into noiseLAB Pro, and performing time slice analysis of FFT, LAeq, and ⅓ octave spectra using it, and exporting these to the appropriate files as described above. Again, time alignment and calibrated must be managed by the user.

Post-processing of data

Sound Level/Sound Power

Based on the Acoustic, met, and turbine data, the sound level and sound power is calculated by the noiseLAB Wind Sound Level/Sound Power Module according to IEC 61400-11. This module also provides validation of data by auditing potential outliers by viewing their spectra. Audio files may also be monitored in an audio monitoring utility included with the system.

Tone Analysis

noiseLAB Wind provides the Tone Analysis Module which performs the tone analysis specified by IEC 61400-11. This is based on the FFT spectra generated by the data acquisition software as well as the met parameters.

Tone analysis  to ISO 1996-2 Second Edition Annex C is provided by noiseLAB Pro. (This option is not shown on the above diagram.)


Measurement Uncertainty

The software module calculates this for all  required parameters as specified by IEC 61400-11.

Output format for report generation

All of the above modules output their results in tabular and graphic form in Excel. From here, the plots and tables can be copied and pasted into your final report. This gives high flexibility in creating reports suited for your organization, including choice of language, layout, logos, etc. while easily importing the final results in a Word compatible format.

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noiseLAB Family Overview

In the following presentation you get a good overview of the noiseLAB family, including lots of screen shots and pictures from the field of the system in action.

noiseLAB Extended Overview

And stay tuned for the official release of the next generation noiseLAB coming soon.

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Practical Challenges ;-)

noiseLAB Wind now provides Wi-Fi capability of up to 1000 meters line of sight. But at this distance, unplanned events can occur.  The meteorology mast and wi-fi antenna was surrounded by an electric fence, which unfortunately, the farmer did not provide powering for.  The cows toppled the fence and the antenna, thus interrupting the measurement.  Satisfied with their achievement, the contented cows are seen relaxing next to the “crime scene” and chewing their cud. Cowfoto

Photo: Mikael Sørensen, DELTA.

Fortunately, we can access the main data collection PC remotely by an iPad, thus making it possible to tune the antenna angle for optimum transmission back to the PC.

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