tags: mus-407 sound sound-properties amplitude decibel

Decibel

A decibel is a logarithmic unit for describing power and intensity, providing a more concise, convenient and meaningful range of numbers

• abbreviated dB, 1/10th of a bel, named after [Alexander Graham Bell]

The decibel is always a relative measurement, either comparing two quantities of comparing one quantity to an implied reference value. This value always depends on context.

• threshold of perception = +-1 dB
• doubling/halving [sound] power = +- 3 dB
• doubling/halving distance from a sound source = += 6 dB
  • also when you cut the [amplitude] in half (or double the height of amplitude)

Decibels are used on a variety of [scales], depending on the context.