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In this section we publish audio-tools, that we developed and that you can use online without installation.

We will soon be providing a variety of tools in this area, all from the field of audio/acoustics.

Many of these tools are free and can be used without registration. Others require free registration on our website.

Very high-quality and complex tools are available as a subscription or with costs per use

Data protection: We respect your data and specify exactly which data we store with which tool. Most tools do not store any data at all but perform the calculations locally.

We also license the code we develop or can develop customized versions.

These tools run on all modern browsers on various platforms (Windows, Mac, Linux, Android, Iphone, etc.) and do not require installation.

Overview

  • Audio Input Devices. Display of available devices for recording
  • Live FFT-Analyzer
  • Live sound level meter 1/3 octave RTA A/C Slow/Fast
  • Wav info: What format does your .wav or mp3 file have? Incl. graphic for the RMS value
  • Evaluation of the reverberation time RT60 (ISO3382) from a room impulse response
  • Evaluation of speech intelligibility (STI and STIPA) according to IEC60268-16 ED5.0 from a room impulse response
  • Calculation of tonality according to DIN45681
  • Calculation of loudness (sone) according to ISO532B
  • Calculation of time-variant loudness (sone) according to DIN 45631/A1
  • evaluations according to TA-Lärm
  • Building acoustics: Airborne sound insulation index ISO140

Audio Input Devices. Display available devices for recording:

With this small web-based tool you can display the available audio devices.

No data is uploaded to our server. All processing takes place locally in your browser.

Free and without registration/advertising etc.

Live FFT-Analyzer:

With this small web-based tool you can display the spectrum (FFT) of the input signal.

No data is uploaded to our server. All processing takes place locally in your browser.

Free and without registration/advertising etc.

Live sound level meter 1/3 Octave RTA A/C Slow/Fast :

This small web-based tool allows you to display the typical readings of a sound level meter. If you use an external microphone and a sound level calibrator, you can measure sound levels with high accuracy.

  • Optimized for mobile devices
  • Can be calibrated: With a sound level calibrator you can measure precise absolute sound levels
  • RMS and spectrum in real time
  • Frequency weighting: A/C/Flat
  • Time weighting: Slow/Fast
  • Display of the spectrum with 1/3-octave (third) resolution
  • Sine wave generator

No data is uploaded to our server. All processing takes place locally in your browser.

Free and without registration/advertising etc.

Wav info:

This small web-based tool allows you to easily analyze wave and mp3 files. Simply drag and drop your file into the rectangle. You will get all relevant file formats (bit resolution, sample rate, etc.). In addition, you will get a graph showing the level (RMS) over time. Areas can be enlarged by zooming. You can save the file as WAV and MP3. This tool scans for additional information (metadata) in the file.

Your wave file remains your property. No data is uploaded to our server. All processing is done locally in your browser.

Free and without registration/advertising etc.

Evaluation of the reverberation time RT60 (ISO3382) from a room impulse response:

With this web-based tool you can calculate the reverberation time in third-octave bands from wave and MP3 files that contain a room impulse response. Simply drag and drop your file into the rectangle. You can also use this tool to make your own recordings. You get the room impulse response by stimulating the room with an impulse source. This can be a bursting balloon, impulse clap, etc.

You will receive the following evaluations:

1) broadband energy vs. time (Schröder curve)
2) reverberation time (T20) over the frequency in third-octave bands as a graphic
3) reverberation time (T20) over the frequency in third-octave bands as a table

Your wave file remains your property. No data is uploaded to our server. All processing takes place locally in your browser.

free of charge and without registration/advertising, etc.

Evaluation of speech intelligibility (STI and STIPA) according to IEC60268-16 ED5.0 from a room impulse response:

This web-based tool allows you to calculate speech intelligibility from wave and MP3 files that contain a room impulse response. Simply drag and drop your file into the rectangle. You can also use this tool to make your own recordings. You can obtain the room impulse response by stimulating the room with an impulse source. This can be a bursting balloon, an impulse clap, etc.

You will receive the following evaluations according to IEC60268-16 ED5.0:

1) STI
2) STIPA
3) Consideration of the background level

Registration and paid subscription required. The evaluation is carried out on our server due to the high computing effort.

This tool serves as a simple and cost-effective alternative to our professional STI measuring devices ( Akulap , Bedrock sound level meter)

Calculation of tonality according to DIN45681

With this web-based tool you can calculate the tonality of wave and MP3 files according to DIN45681 . Simply drag and drop your file into the rectangle. You can also use this tool to make your own recordings.

You will receive the following evaluations according to DIN45681

1) Determination of the tonal components
2) Frequencies of the identified tones
3) Calculation of Delta L

Registration and paid subscription required. The evaluation is carried out on our server due to the high computing effort.

This tool serves as a simple and cost-effective alternative to our professional systems such as Akulap .

Calculation of loudness (sone) according to ISO532B

With this web-based tool you can calculate the loudness in sone from wave and MP3 files . Simply drag and drop your file into the rectangle. You can also use this tool to make your own recordings.

You will receive the following evaluations according to ISO532B

1) Loudness in sone for stationary noises

Registration and paid subscription required. The evaluation is carried out by the high computing effort on our server.

This tool serves as a simple and cost-effective alternative to our professional systems such as Akulap

Calculation of time-variant loudness (sone) according to DIN 45631/A1

With this web-based tool you can calculate the loudness in sone from wave and MP3 files. Simply drag and drop your file into the rectangle. You can also use this tool to make your own recordings.

You will receive the following evaluations according to DIN 45631/A1

1) Loudness in sone for time-varying noises


Registration and paid subscription required. The evaluation is carried out by the high computing effort on our server.

This tool serves as a simple and cost-effective alternative to our professional systems such as Akulap

evaluations according to TA-Lärm

With this web-based tool you can calculate the relevant values ​​for TA noise from wave and MP3 files. Simply drag and drop your file into the rectangle. You can also use this tool to make your own recordings.

You will receive the following evaluations according to TA-Lärm

  • LAEQ over time and as mean
  • LCEQ over time and as mean
  • LAFMAX
  • LCPEAK

Registration and paid subscription required. The evaluation is carried out by the high computing effort on our server.

This tool serves as a simple and cost-effective alternative to our professional systems such as Akulap

Building acoustics: Airborne sound insulation index ISO140

With this web-based tool you can calculate the airborne sound insulation value between rooms from wave and MP3 files . Simply drag and drop your file into the rectangle. You can also use this tool to make your own recordings.

The aim of this measurement is to record the sound transmission, especially the attenuation between two rooms

A sound source with pink noise is set up in room 1 (transmitter room). Measurements are taken in the transmitter room and the receiver room. You make a recording in the transmitter room and then in the receiver room.

You will receive the following evaluations according to ISO140

  • sound level difference in octave bands
  • single value

Registration and paid subscription required. The evaluation is carried out by the high computing effort on our server.

This tool serves as a simple and cost-effective alternative to our professional systems such as Akulap