pink noise

Pink noise is a type of sound in acoustics that contains all frequencies within the audible spectrum. However, unlike white noise, which has equal intensity across all frequencies, pink noise's intensity decreases as the frequency increases. This decrease is at a rate of three decibels per octave.1

This characteristic makes pink noise similar to the sound produced by acoustic musical instruments. Because of this, it's used to assess the acoustic properties of listening rooms and auditoriums, helping to identify issues like reverberation time and unwanted resonances. It's also utilized in audio equalizers to ensure a balanced sound response in a listening environment. Pink noise is distinct from white noise, which has equal intensity across all frequencies.12