Audio signals

Audio signals are generally referred to as signals that are audible to humans. Audio signals usually come from a sound source which vibrates in the audible frequency range.

There are numerous ways to classify audio signals. If we consider the source of audio signals, we can classify them into two categories:

• Sounds from animals: Such as human voices, dog's barking, cat's mewing, frog's croaking.
• Sounds from non-animals: Sounds from car engines, thunder, door slamming, music instruments, etc.