How is sound represented in electronic sound equipment such as a radio?
When somebody speaks into a microphone, the microphone converts the vibrating sound waves into an electrical signal; the signal is shown as a fluctuating wave, the wave varies depending on the loudness, pitch and tempo of the original sound wave.
How does the speaker change the electrical audio signal into a sound wave that can be heard?
After the sound waves have been converted into an electrical signal, the device reads the electrical signals and uses that to vibrate and move the speaker back and forth, recreating the sound waves originally picked up by the microphone.
