If we consider repeated patterns within audio signals, we
can classify them into another two categories:
- Quasi-periodic sound: The waveforms consist of similar repeated patterns such that we can perceive the pitch. Examples of such sounds include monophonical playback of most music instruments (such as pianos, violins, guitars, etc) and human's singing/speaking.
- Aperiodic sound: The waveforms do not consists of obvious repeated
patterns so we cannot perceive a stable pitch. Examples of such sounds
include thunder pounding, hand clapping, unvoiced part in a human's
utterance, and so on.
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