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Adult male is somewhere around 120 hertz. on the other hand the average adult female voice has about 225 hertz per second. it's twice as high as men. on the other hand a small child produce somewhere around 400 hertz on the average. small children has highest pitch. this is based upon the speech samples while everybody is talking in a normal speech, carrying out conversation. this pitch goes all over the place when someone extreme conditions like roller coaster

Vibration in the speech. if there's a long amount of vibration, we will not proceed. the suspect voice recorded in the quiet room. if the telephone line has a bad quality, these days most of the telephone, especially land line carries decent quality. it can be usable. depending on the cell phone that distorts human voice. when we have to confront this disparity the examiner is mandated to stay away from further analysis. >> you've talked about sort the

Factors that affect your ability to conduct an analysis. i think you mentioned there's variations in what is going on with the speecher in terms of mental state or physical state or emotional state, the way the speech is expressed. you were just talking about sort of variables that could go on with the mechanism of the recording, the cell phone distortion and that sort of thing. are there other environmental facto factors, the distance between the recording and the mic microphone, are there other factors over and above with the speaker and microphone that could have an effect? >> yes. thank yo...

Only 2.35 seconds that could to in anyway be considered suitable? i don't mean suitable that it was suitable, but that's what you had to start with to make that decision? >> yes, that was cleanest area that we attempt to do any kind of analysis, not just for scientific but any kind of analysis. >> when you would say you like 30 minutes or up to 3 minutes of speech for analysis, are you talking about normal speech ore screaming speech? >> normal, natural conversational speech. >> why is that? what's this notion of phonetically balanced speech? >> the computer takes statistics of dynamic variati...

Spoken. it would be devoid of disguise attempt. any evidence of intoxication there must be removed from analysis and also we pay attention to emotional state of this speech. if the person is uttering voice samples with the extreme happiness, their voice would be too joyous including lots of giggling, those must be removed. sometimes we run into voice being uttered when the person is going through stress or undue depression. the voice must be also be removed and any other unnatural voicing say like yelling, screaming. this type of voice must be removed from the analysis and