DateThis.app is free service that detects the Electrical Network Frequency (ENF) from audio signals, and then compare it to known historical references.

Match scores are provided without any warranty of accuracy. Any non-amateur use of the application should be reviewed by a qualified person.

For any question, reach Raphael at raphael {at} noisycamp {dot} com.

Privacy policy

DateThis.app does not collect any personal information, such as IP addresses or location. The app does not rely on cookies.

Uploaded audio signals are stored in their downsampled (up to 1000 Hz) format. Video data is fully discarded.

E-mail addresses collected during the processing of an audio signal are discarded automatically once no longer required.

DateThis.app is hosted in Belgium.

Source code

Signal processing algorithms are publicly published through the libhum open-source library.

Reference signal coverage

DateThis.app only possesses a restricted history of the power grid frequencies.

The following table presents the available frequency data that can be matched against for some electrical power grids.

Source credits

• European Network of Transmission System Operators
  • Wind Energy Technology Instiute (WETI), Henning Thiesen, Arne Gloe and Clemens Jauch
    Website
  • SwissGrid
    Website
• UK National Grid
  • National Grid Electricity System Operator (ESO)
    Website
• Synchronous grid of Northern Europe
  • Svenska kraftnät
    Website

Citation

If you use Libhum or DateThis.app in any scientific publication, please use the following BibTex citation:

@software{Javaux_Libhum,
    author = {Javaux, Raphael},
    license = {LGPL-3.0},
    title = {Libhum},
    url = {https://github.com/RaphaelJ/libhum},
    year= {2024},
}

    

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