What is Audio Visual Forensic Analysis?

Audio and Visual evidence is becoming more and more prevalent in court cases around the world.  In the UK there are more CCTV cameras than in any other country, some would say this is big brother watching over everything we do, others would see past the scaremongers and see that everyone is using it as it can be an effective way of getting convictions in court.

The main issue with visual evidence in particular is the quality of the recording.  There are high definition quality cameras, but these are still relatively scarce due to their cost.  Visual forensic analysis can extract data from seemingly unusable digital video content and lead the way to vital information that can solve criminal cases and stand up in court.

Audio forensic analysis is similar in that by examining audio that may at first listen seem inaudible; experts can extract sounds and clear any background noise to give a clear stream of audio evidence.  Such recordings can come from any number of sources including mobile telephones or recorded conversations.

As an extended arm of digital forensics, audio and visual forensic experts will also look to recover audio and video information that was thought to have been deleted.  With many people storing digital data on computer hard drives or other removable media, it is often the job of computer forensic experts to first recover the data from deep inside the computer’s memory.  This multi-step recovery process, from first getting hold of the hardware that is storing the data, to recovering the data to then clean it up so that it can be clear what its contents are can be a large undertaking, but is often ultimately worth it.

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