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