Definition

Noun: * A steady, unobtrusive sound containing a blend of all audible frequencies at equal intensity. It is often used to mask or drown out other, more distracting sounds.

Usage

• White noise is typically used as a non-count noun. It refers to the general concept or a continuous source of this sound.
• It is commonly employed in contexts related to sleep, concentration, privacy, and audio engineering.

Examples

• Noun:
  • She plays white noise all night to help her sleep through the city sounds.
  • The constant hum of the air conditioner acted like white noise, allowing him to focus on his book.
  • Audio engineers use white noise to test sound equipment and acoustic spaces.

Advanced Usage

• Technical Context: In acoustics and signal processing, white noise is formally defined as a random signal having equal intensity at different frequencies, giving it a constant power spectral density.
• Figurative Use: The term can be used metaphorically to describe a large amount of unsorted, undifferentiated, or meaningless information.
  • The barrage of notifications on his phone was just white noise to him after a while.

Variants and Related Words

• Pink Noise (n): A variant of noise where the power spectral density is inversely proportional to the frequency. It is often perceived as more balanced or natural-sounding (like steady rain or wind) compared to white noise.
• Brown Noise (n): Also called Brownian or red noise, it has even more energy at lower frequencies, producing a deep, rumbling sound (like a waterfall or strong wind).

Synonyms

• Static (n): Specifically refers to the white noise heard on radios or televisions when not tuned to a station. While a type of white noise, "static" is more context-specific.
• Hiss (n): A sibilant sound that can be a component of white noise, often used to describe the sound of steam or a radio between stations.

Related Phrases and Idioms

• To drown out with white noise: To use white noise to make another sound inaudible.
  • I use a fan to drown out the traffic with white noise.
• A wall of white noise: Describes an overwhelming, impenetrable, and constant sound.
  • When the alarm went off, it was like a wall of white noise.

Noun

1. a noise produced by a stimulus containing all of the audible frequencies of vibration
   • white noise is a good masking agent