the frequency at which voice signal is sampled lie between 200hz to 2khz
8 khz, as voice frequency is from 300hz to 3400 hz . so max. is 3.4khz which is approx. taken as 4 khz. as we know sampling freuency should be atleast twice the highest frequency component so it comes out to be 2 time of 4 khz. i.e. 8 khz.
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