ENF-EXPERT is a powerful forensic audio and video evidence authentication tool.

By expert experience Electrical Network Frequency pick-up is present in every third case of audio and video forensic examination. ENF pick-up is conducted by electro-magnetic influence of electric power supply network or any electronic equipment on the analogue chain of the audio and video signal recording.

Electrical Network Frequency is changing slightly during time as different network customers are joining or leaving the net. ENF change has always individual behavior and cannot be predicted. The ENF database keeps historical values of the mains frequency value and can be used for the search of the ENF trace extracted from the audio/video evidence matching to the certain period of time. If there is a match the audio/video evidence continuity and exact date and time of the recording can be verified standing as a proof of its’ authenticity.

ENF ANALYSIS solution consists of:

  • ENF-TRACKER — hardware tool for precise ENF value measurement;
  • ENF-SERVER — software application for ENF database management;
  • ENF-EXPERT (or ENF module in OT-EXPERT (TD-EXPERT) and VD-EXPERT) for ENF traces extraction and search for ENF database match.


ENF-TRACKER is the hardware equipment developed for the purposes of ENF database collection using precise measurements.

Metal shielded box reduces the impact of any other EM interferences. The system is compatible with all types of mains plugs, voltage and frequency parameters of local electric grid.

ENF-SERVER is the software part of ENF database collection and management. ENF measurements precision is 0.001 Hz. ENF-SERVER allows to navigate through the database and provides real-time ENF visualization over dynamic spectrogram.

ENF-EXPERT can be a module of VD-EXPERT or TD-EXPERT or a standalone application that extracts the ENF trace from audio or video signal of the media evidence and runs the search of the extracted ENF evidence pick-up through the ENF database, proving the exact date and time of the recording and verifying signal continuity.



  • precise detection of ENF (SNR <60 dB, shielded box)


  • accurate ENF extraction
  • 0.001 Hz precision
  • database collection
  • database navigation and management
  • real-time ENF visualization
  • two options for time measurements:
    • Internet (if connection allowed)
    • GPS sensor (if connection restricted)


  • Extraction of ENF trace from audio or video signal;
  • Search of ENF pattern in ENF database;
  • Allocation of evidence date and time in ENF database timeline
  • Simultaneous audio and video playback.

ENF-EXPERT supported video formats

Display and frame positioning for all general video file formats: MPEG-4/QTFF (*.mp4, *.mpv, *.mov, *.3gp, *.3g2), ASF (*.wmv, *.asf), RIFF AVI (*.avi), Matroska (*.mkv), FLV (*.flv, *.swf), h264 (*.h264, *.264, *.psf, *.dav, *.avc), MPEG_PS ( *.mpeg, *.mpg, *.mod,*.vob), MPEG_TS (*.mts, *.m2ts), images (*.jpeg, *.bmp, *.png).

All audio files formats: 3gp, aac, ac3, amr, ape, asf, au, avi, avm, avs, cda, dat, divx, dts, flac, flv, m4a, mkv, mka, mov, mp2, mp3, mp4, mpa, mpc, mpeg, mpg, mts, nsv, ofr, ogg, ogm, ppk, ra, rm, rmvb, tp, ts, tta, vdr, vob, voc, wav, wma, wmv, wsd.


  • Proprietary technology of ENF measurement and storage;
  • Unique algorithm of the evidence ENF-trace search through the ENF database;
  • Very high reliability of evidence authentication;
  • Specially designed by audio and video experts.


The software is protected
by USB dongle;

Installation on multiple workstations is allowed;

The license
is lifetime.


Phone/Fax: +7 (495) 679-19-28

Moscow, st. 5th Kozhukhovskaya, 22, bldg. 1, 15A