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Originally posted by aplanetaryguide
Also did anyone catch the reason why they couldn't use night vision cameras? That one is unexpectedly curious, because of how many ghost hunters use night vision equipment.
Scientific investigations into Bacci include voice print analysis using FBI software. Recordings of people’s voices before they died have been compared to those emerging from Bacci’s radio have produced a 97% match. This is the first time Bacci’s work has appeared in a UK/US production.
"Several studies have been published on the reliability of voice identification. A Federal Bureau of Investigation survey of its own performance in the voiceprint examination of 2,000 forensic cases revealed an error rate of 0.31 percent for false identifications and 0.53 percent for false eliminations.The process of identifying voices visually involves translating the wave patterns produced by the voice into a pictorial display called a spectrogram. The spectrogram serves as a permanent record of the words spoken and facilitates the visual comparison of similar words spoken by an unknown and known speaker's voice.
Is it possible for a person to "fool" a spectrograph (the device that produces the spectrogram)?Not really, Cain says."You can disguise your voice," he notes, "but you're not fooling the spectrograph; you're just not giving a parallel sample. If you distort your natural speaking voice to the point that you're not giving parallel voice samples you're really not comparing apples and apples. You're comparing apples and oranges. An experienced operator would notice this immediately. If I see this I won't stand for it and I will tell the court I will not accept such a sample and often they'll throw the defendant in jail for failing to comply with the district attorney's request for a natural, undisguised sample."Cain says that it's essential that speech samples contain exactly the same words and phrases as those in the questioned sample, because only identical speech sounds are used for comparison. He says the suspect should not be allowed to read the phrases from a transcript but should repeat each phrase after it is spoken by someone else. To avoid an unnatural response, the suspect should repeat the first phrase and proceed in the same manner with each successive phrase.What are the limits of the accuracy of voiceprints?'The limits," says Cain, "generally are the quality of the evidence it self. It's like any other pattern-matching skill, such as handwriting. You have to have good samples."
Do voiceprints compare in accuracy to fingerprints?
"If done properly, yes, in my opinion," says Cain, who adds, "However, with fingerprints you have static images that don't change unless some damage is done to the fingerprint ridge detail. In voiceprints these are dynamic qualities. For example, when you say good morning to your wife or husband early in the morning before you've had your first cup of coffee and then say it again later in the morning there will be some changes in the pitch of your voice and how you stress certain vowels. That's why we get several repetitions of a speaker's voice, saying the same thing, so we can find the range of variation."