Current affairs television shows and documentaries will sometimes employ the use of voice changers to disguise the voice of someone who wants to remain anonymous.Voice changers can be seen in various movies, including Scream, Saw, Super Troopers, Steel and a Talkboy voice changer was used in Home Alone 2: Lost in New York.The results of voice changing through software are quite impressive and satisfactory. The pitch plays an important role from changing a male voice into female voice, and vice versa. Most algorithms modify the voice by changing the amplitude, pitch and tone of the voice. There is a plethora of techniques that modify the voice by using different algorithms.
Nowadays, software implementations are very common. More sophisticated voice changers have different levels of various distortion effects variable by faders. There are low-priced, small lithium battery-powered voice changers that are used between a phone's mouthpiece and the user's mouth. The earliest voice changers were electronic devices usually used over the telephone for the purpose of disguise.
