What is an Audio Signal?
An audio signal is an electrical representation of a sound.
The following is a typical audio signal chain:
- The sound source creates sound wave vibrations in the air.
- These vibrations of the sound waves are picked up by a microphone.
- The microphone converts the vibrations into an electrical signal.*
- The electrical signal is processed.
- Eventually, the signal ends up in an output device (such as an earphone or loudspeaker).
- The output device converts the electrical signal back into sound waves.