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AUDIO & VIDEO FORENSIC ANALYSIS

We provide the following services:

  • Clarification of audio evidence using different noise reduction and other algorithms.

  • Clarification of Video evidence for identification and association of different events captured by video surveillance systems.

  • Analysis of images extracted from video evidence using clarification and forensic enhancement tools.

Unlike other forms of forensic evidence, audio and video recordings can provide a story and investigators can see or hear what occurred. These sources of recorded audio and video that can help in an investigation have increased exponentially. Video and audio recorders can be found in businesses, traffic intersections, parking lots, ATMs, police vehicles, and of course, on cell phones.

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For large-scale events or crimes, the sheer amount of recorded audio and video evidence can be enormous, and for many crimes, high-quality audio and/or video recordings are often not available. 

This is where audio and video forensics can help. Forensic experts have techniques to enhance recordings, bring out details and give a clearer picture of what happened, or make an audio recording cleaner. This, in turn, helps investigators, lawyers or jurors to better perform their duties.

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Audio and video evidence can be found in more places and from more diverse sources than ever before. From stores, fast food restaurants, malls, banks, traffic intersections to parks and residences. These systems are pretty much everywhere. And cell phone cameras extend a watchful eye to almost every corner of every city. Audio evidence may be available from 911 calls, answering machines, voicemail recordings, video cameras, cell phones, and computer files.

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Audio forensics is a detailed examination of audio files for legal purposes. Audio forensic experts examine the recording in a forensic lab to determine its authenticity. The exam typically involves checking completeness, improving speech clarity, transcribing dialogue, comparing voices, and reconstructing timelines of events.

FORENSIC AUDIO AUTHENTICATION AND ANALYSIS

Once the evidence is collected, the audio forensics expert will inspect the recording to determine its authenticity. In this digital age of advanced editing software, it's easy to manipulate an audio file, making it fake. The expert will examine the recording using SWGDE best practices to determine if an audio file has integrity.

Audio files can also be enhanced to remove unwanted background noise so dialog can be heard more clearly. Various filters are applied to the recording to achieve this, such as:

FREQUENCY EQUALIZATION

Equalizers cut or boost specific frequency bands. The frequency bands that contain most of the speech content (600-3000 hertz) can be isolated or amplified to make speech more intelligible. If there are strong background noises, a spectrum analyzer can be used to identify its frequency and reduce the noise with the equalizer.

COMPRESSION

If the speech or sounds on the recording are weak, the signal can be compressed to reduce the dynamic range and emphasize softer sounds.

SPECIFIC FILTERS

We have a licensed arsenal of application-specific forensic software tools like De-Reverb, De-Wind De-Hum, and De-Crackle.

Audio files that have been examined and clarified by an audio forensic expert can be used in court as evidence. The audio forensic scientist can serve as an expert witness and provide reports and testimony regarding the results of their investigation. The information they provide includes everything from their methodology to impartial opinions on the results obtained.

AUDIO AND VIDEO ANALYSIS

The Audiovisual Analysis Department deals with the scientific examination, comparison and/or evaluation of audio and video evidence in legal matters.

The Audiovisual Analysis Department is equipped with the latest forensic tools for audio and video analysis that are used worldwide in the Forensic Community and are also LEVA (Law Enforcement/Emergency Video Association) approved.

Don't see what you're looking for on the list?

Call us at (787) 276-5619 or email us at info@covertintelligencegroup.com to see if we can help you.

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