TD-Expert – is a system for forensic audio investigation – a set of professional instruments for audio editing detection.
TD-Expert is a set of special tools designed to detect audio modification during forensic study when the audio recording stands as evidence in a criminal case: audio stream authentication, revealing changes in the sequence of events or their content, speech enhancement, identification of the audio recording device.
device's storage examination reveals the features of the data sequences formation. This allows to establish whether the audio evidence was recorded using this device or copied to the storage device from an external source.
includes a detailed analysis of the file header and file structure verifying its compliance with the file format and recording format standards. The frame allocation map reveals the order of frames (and its violations). Metadata analysis reveals signs of editing using specialized software tools.
Consists of instruments focused on samples sequence analysis: histogram of samples, samples levelogram, distribution center behavior, repeating samples automatic search, automatic search of identical signal fragments (“copy-paste” detector), signal derivative.
is represented with methods focused on frequency characteristics of the recorded signal: momentum and average spectrum, dynamic spectrogram with view normalization, dynamic cepstrogram (autocorrelation), frequency range analysis, re-sampling traces detection, usage of filters traces investigation, narrowband signals (technical harmonics) energy and phase continuity detection.
Electrical Network Frequency analysis allows to establish exact date and time of the recording and its continuity.
allows to detect parameters of codec by the signal properties (MP3, WMA, AAC, OGG) including positioning of codec frames in the signal without information from the file header. Periodicity of frames sequence confirms audio signal continuity. The method allows to detect previous coding traces and compare evidence and test recordings features.
includes the research of synchronization between audio and video stream of the evidence. Comparison of video and audio signals behavior reveals traces of editing and manipulation, complementing each other.
includes the recording device analog and digital features analysis by evidence and test video recording comparison. Every approach listed above provides its own contribution into recording device identification: FAT analysis, file header and structure analysis, histogram of samples and DC Offset analysis. The unique functionality implemented in TD-Expert allows the user to extract and analyze audio recording editing traces and to export the results to the expert's report.
All audio files formats and majority of video files formats supported and converted: 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.
Majority of video formats supported. Audio track extraction and simultaneous audio and video playback.
The software is protected
by USB dongle;
Installation on multiple workstations is allowed;
Phone/Fax: +7 (495) 679-19-28
Moscow, st. 5th Kozhukhovskaya, 22, bldg. 1, 15A