| Audio and Visual evidence is becoming more and | | | | inaudible; experts can extract sounds and clear |
| more prevalent in court cases around the world. | | | | any background noise to give a clear stream of |
| In the UK there are more CCTV cameras than in | | | | audio evidence. Such recordings can come from |
| any other country, some would say this is big | | | | any number of sources including mobile telephones |
| brother watching over everything we do, others | | | | or recorded conversations. |
| would see past the scaremongers and see that | | | | As an extended arm of digital forensics, audio and |
| everyone is using it as it can be an effective way | | | | visual forensic experts will also look to recover |
| of getting convictions in court. | | | | audio and video information that was thought to |
| The main issue with visual evidence in particular is | | | | have been deleted. With many people storing |
| the quality of the recording. There are high | | | | digital data on computer hard drives or other |
| definition quality cameras, but these are still | | | | removable media, it is often the job of computer |
| relatively scarce due to their cost. Visual forensic | | | | forensic experts to first recover the data from |
| analysis can extract data from seemingly unusable | | | | deep inside the computer’s memory. This |
| digital video content and lead the way to vital | | | | multi-step recovery process, from first getting |
| information that can solve criminal cases and | | | | hold of the hardware that is storing the data, to |
| stand up in court. | | | | recovering the data to then clean it up so that it |
| Audio forensic analysis is similar in that by | | | | can be clear what its contents are can be a large |
| examining audio that may at first listen seem | | | | undertaking, but is often ultimately worth it. |