how can i get to know the frequency of a speech signal? What is the actual meaning of frequency? what if the signal is aperiodic??
In general, we say that frequency means the repeatition of an event in unit time. But what about a speech signal? how can we say that a speech signal is having 4KHz Bandwidth(say)?
A speech signal can contain a lot more than 4kHz bandwidth, however experiments showed that if you removed all but the spectrum below 3kHz (thus allowing the use of cheaper circuitry), it was still reasonably understandable by another human.