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And echoes created by bouncing walls. that sort of smears the voice. another thing is that far-field voice tends to have very poor signal to noise ratio. signal to noise ratio is the ratio of signal divided by noise signal. say like in the courtroom the signal level when we measure it by sound pressure meter it might give something like 40 dd decibels. i'm talking probably with the total of about 80 db loudness and the signal to noise ratio is

Mixed with the noise created by the room and also reverberations and echoes created by multiple bouncing walls. that sort of smears -- >> we've been listening to dr. nakasoni right now. we'll be right back for more from the zimmerman trial, live from sanford, florida. we also expect as early as today to hear from the lead investigator coming up. that could happen at the end of this witness. the state's 23rd witness. and the president is expected to be speaking from tanzania shortly. we will bring you there live as well. we'll be right back on "the daily rundown."ey don't now it y. they will. i...