Скачать или смотреть 3. What is the difference between a Noise and a Note?

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Both noise and notes are mixtures of sound waves at different frequencies.

A note is made up of a ripple pattern which repeats itself over and over again in an ‘ordered’ way.

While a noise is made up of individual ripples which have no relationship to each other and do not repeat - and so are ‘disordered’.

If an object moves, it causes a disturbance in the surrounding air which ripples out as soundwaves. If the object vibrates with a fast and repeating pattern, like a string, then the sound waves will be evenly-spaced and regular; that is, the air particles are squeezed together into evenly-spaced waves. These evenly-spaced, regular sound waves are heard as notes with distinct pitches.

But, if you drop a vase or slam a door shut, you hear a noise which is made up of a lot of unrelated frequencies with no repeating pattern – and so will be a heard as noise with no defined pitch.
To be a note, it doesn’t really matter how complicated the individual ripples are, as long as the pattern repeats itself.

Some of the animations in this video were sourced from the below websites. A big thank you to them.

Title: Molecule5.gif
Author: Lookang
Link: https://commons.wikimedia.org/wiki/Fi...
License: Creative Commons Attribution-Share Alike 3.0 Unported