Abstract
In this modern era, the misuse of computers and tape recorders results in the widespread use of telephones, cell phones and tape recorders. This makes them an effective tool for the commission of criminal offences, where certain forms of crime are often used by criminals. Any criminal minded individuals might use some strategies and tricks to conceal the voice, assuming they would remain undercover, that some would not identify them. The misuse of voice can be evaluated by using the individualization character of audio. The manipulation or alteration of the speech of individuals is regarded as voice disguise. It can be done intentionally or non-intentionally. Luckily, it is not so easy. Because everyone has their own different and unique voice. By examining the parameters like pitch, frequency, way of talking, focusing on vowels can help to identify the disguised voice produced by someone by changing their voice. Pitch shift is a common method of mask introduced by perpetrators When comparing forensic voices, there is a lot of variation in acoustic properties leads to weaker detection in speaker performance. In most cases, the perpetrator tries to cover his voice until an anonymous or diverse call is sent. That is why it is necessary, before naming a speaker, to research the possibilities for covering the voice. The review paper deals with the studies reported on to analyse and compare genuine with disguised voices using various techniques and softwares.
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