Through the invention of the telephone, Alexander Graham
Bell gave birth to the transmission of the spoken words on
wires. Certainly such remarkable invention was the foundation
of the microphone as well as the earphone later on used in
the development of radio and broadcasting.
As professor of Vocal Physiology at Boston University, Bell
was engaged in the study of the speech’mechanics, which
finally led him to develop the first device for the transmission
of the spoken words on wires.