What is examined

Examination of audio recordings: signs of alteration, discontinuity, noise in the acoustic environment, recording conditions, signs of copying and connection to the recording device.

The examination uses the submitted audio and video materials, storage media, recording devices, voice and speech samples, case documents and the questions posed.

Possible questions

whether the recording is suitable for the task posed;
whether there are signs of alteration or discontinuity;
the content of the relevant recording segment;
which audio or visual features are relevant to the case;
whether the materials and samples provided are sufficient;
whether the findings of a previous examination are substantiated.

What to provide

source files without forwarding through messaging apps, if possible;
the storage medium or recording device;
the start and end times of the relevant segments;
voice and speech samples for identification questions;
an investigative order, a court ruling or draft questions;
information about the recording conditions.

Pricing

from RUB 90 000. The exact cost depends on the recording's duration, material quality, number of segments and questions, the need for a report review and urgency.

Audio recording examination considers file properties, the acoustic environment and signs of recording conditions. Technical examination is distinguished from interpretation of speech and determination of its legal significance.

Subject of examination

The audio file and information about its provenance
The background environment, noise and technical alterations
The device or available information about the recording channel

Sample questions for the expert

What technical properties does the submitted file have?
What changes in the acoustic environment and recording can be detected?
Are the signs sufficient for a conclusion about conditions or transformations?
How do copying, compression and processing affect the examination?

The final questions are formulated according to the objects and circumstances of the particular task.

What to prepare

The file in its earliest available form
Information about the recording device and application
The history of copying, export and processing
The storage medium, accompanying documents and questions

How the examination is conducted

Available technical parameters and audio signal characteristics are analysed. Provenance and transformation history are taken into account when interpreting each sign.

Scope and limitations

Failure to detect signs of processing does not prove that the recording is entirely unchanged. Background sound does not always allow a specific location or device to be established.

What the deliverable records

The result sets out the properties detected, substantiated conclusions about conditions and limitations relating to the submitted copy.

Cost and terms

from RUB 90 000. The exact cost depends on the recording's duration, material quality, number of segments and questions, the need for a report review and urgency.

Inquiry

Send a recording or describe the task

You may send an audio or video file, a link, an investigative order, a court ruling, draft questions or an existing report for review.

voice and spoken speech;
the acoustic environment and audio recording traces;
video images and video recording traces;
editing, continuity, the recording device;
report review and questions for court.

Type of examinationYour nameContact phone number or email *Briefly describe the task *Attach materials

Up to 10 files of 10 MB each, up to 15 MB in total. Preserve source recordings and metadata without resaving. Arrange the transfer of large files and storage media separately by email.

I give consent to the processing of my personal data for the purpose of considering and responding to my enquiry.

How data is processed: Personal Data Processing Policy. Attach only materials relevant to the examination; redact unnecessary data about other people.

Leave blank

For a preliminary assessment, please specify the file format, recording source, start and end times, recording device, and availability of the source file and voice samples.

Attachments: up to 10 files of up to 10 MB each, with a maximum combined size of 15 MB. If a file is rejected, the enquiry is not sent.

Examination of the acoustic environment and audio recording traces