What is the approximate frequency range of human speech?

A.
20 Hz to 20,000 Hz

B.
40 Hz to 15,000 Hz

C.
200 Hz to 9000 Hz

D.
600 Hz to 5400 Hz

Explanation:
Human speech ranges from 200 Hz to 9000 Hz but Nyquist cut the sampling frequency range to 4000 Hz to save bandwidth although this cut down the quality of voice too.