28.2.15  Normalizing audio

The normalize command scales the amplitude of an audio clip.

• normalize takes two mandatory arguments:
  • A, an audio clip.
  • level, a negative real number specifying the maximum audio level in decibels (setting a positive value would result in clipping, i.e. audio distortion).
• normalize returns the copy of A normalized to the desired level.

Example

To normalize a sinusoidal sound to −6 dB:

Indeed, since about computes the level of audio:

Bit depth: 16
Channels: 2 (stereo)
Sample rate: 44100
Length: 132300 samples
Duration: 3 seconds
Level: -6.00048 dB