How do you define "white noise" in audio terms?

In audio terms, "white noise" is defined as a random signal that has equal intensity across a wide range of frequencies, which results in a constant power density. This means that all frequencies within the range are present at the same amplitude, contributing to a sound that is perceived as a consistent hissing or whooshing noise. This characteristic makes white noise useful in various applications, such as sound masking, sleep aids, and audio testing, because it provides a uniform sound that can help to drown out other noises.

The uniform distribution of sound across frequencies is what distinguishes white noise from other types of sounds, such as steady beats or specific tones. This quality is also why it can occupy a significant amount of auditory space without being directly identifiable as a specific sound or musical note. In contrast, other options do not accurately capture the essence of white noise, as they pertain to more defined sounds or unwanted audio artifacts.