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Tips To Understanding Forensic Audio Analysis

By Freida Michael


There are many components involved in solving a crime investigation. Forensic audio analysis is a process that involves investigators examining and analyzing different types of sounds from a crime scene. These sounds usually include recordings such as from phone calls or other devices. Audio forensics is an essential part of any crime investigation.

The analysis of forensic sound has many components. First the authenticity of the sound must be confirmed. Then it must be evaluated in order to assure that it can be used in a court of law. If it passes both of those it is enhanced in order to ascertain that nothing was missed in the initial listening and in order to improve audibility. Then the sounds on the recording -- such as people talking -- must be identified. If there is someone talking on the recording, it is the job of the investigators to figure out who it is. Any dialogue is transcribed, and the recording is used to set up the scene of the crime through sounds.

The audio is enhanced to improve the sound and make it clearer. This is to make sure nothing was missed on the initial listen. When a sound is enhanced, it cleans any unwanted noises such as static. Sound analysis requires professional equipment and specific skills. Improved technology allows different was to analyze sound. The old method required huge equipment. Technology has made it so most work is done digitally on computers today.

There are many different techniques used thanks to technology. Digital signal processing involves using math to manipulate an information signal. It messes with time and the frequency of the sound to better understand it. One trick is to reverse engineer a noise to determine where it came from. An analysis must be careful not to destroy important evidence while cleaning recordings. Discrete Fourier transform orders sounds by their frequencies as a way to interpret sounds better.

Sound analysis first came onto the scene during the Watergate scandal, when investigators had to pick apart the audio recordings ceased in the course of the investigation. In those days they had racks of huge equipment to help them. Today, however, most of the work is done digitally, on computers. Today's technology can achieve what would have been impossible back during the Watergate investigation. However, a working knowledge of the old equipment is still welcome and appreciated even in today's digital world.

Because sound recording may come from different devices, a crime scene may involve many sound recording devices. Audio recordings are available from 911 calls, voicemails, and memory cards from mobile devices and computers. Consequently giving tons of clips to analyze. A forensics audio lab needs to be organized and thorough as they handle tons of recordings. Their work is crucial because a legitimate sound lab analyzes these recorded sounds and makes sure that they are permissible in court.

Sometimes, these forensic technicians must testify in a courtroom. They describe the sound and their analysis of the findings. It is important that they do an accurate and efficient job in analyzing sound from crime scenes. Their work plays an important part in the court of law and solving a crime. Their work is under careful observation in court and they must be able to defend their findings.

Audio forensics is an important part of an investigation. Recordings can help unravel things like motives and alibis, and can even help with determining who is at the scene of a crime. It is a difficult task to undertake, and an important part of trying to solve a crime.




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