Definition

Noun: 1. Extraneous or unwanted sound present in an environment: This refers to any ambient, non-essential sounds that are part of an acoustic setting but are not the primary sound of interest. It is often considered a disturbance or interference. 2. A constant or persistent low-level sound: This can describe a continuous, often unnoticed, auditory backdrop to a situation or activity.

Usage

• Background noise is typically used as a non-count noun. It refers to the general ambient sound, not individual sounds.
• It is commonly discussed in contexts like audio recording, communication, and environmental acoustics where distinguishing a primary signal from surrounding sound is important.

Examples

• The background noise of the cafe made it difficult to hear our conversation.
• Audio engineers use filters to reduce background noise in podcasts.
• I find the gentle background noise of rain helps me sleep.
• There was too much background noise on the phone line, so I called her back.

Advanced Usage

• Signal-to-noise ratio: A technical term often used alongside background noise. It describes the relationship between the desired signal (e.g., a voice) and the level of background noise. A high ratio means the signal is clear; a low ratio means the noise is problematic.
• Acoustic backdrop: A more descriptive synonym that emphasizes the environmental and constant nature of the sound.

Variants and Related Words

• Ambient noise: A very close synonym, often used interchangeably. It emphasizes sound that is present in an environment.
• White noise / Pink noise: Specific types of constant, even background noise often used to mask other disruptive sounds or to aid concentration or sleep.
• Interference: A broader term that includes background noise but can also refer to non-acoustic disruptions (e.g., radio static, electronic distortion).

Synonyms

• Ambient sound
• Hubbub (specifically for noise from a crowd)
• Hum (specifically for a low, continuous sound)
• Racket (implies loud, disturbing noise)

Antonyms

• Silence
• Quiet
• Signal (in a technical context, as the desired sound opposed to noise)

Related Phrases

• Drown out the background noise: To overcome or mask the ambient sound.
  • She turned up the music to drown out the background noise from the street.
• Fade into the background noise: To become an unnoticed or insignificant part of the general sound environment.
  • After a while, the construction sounds faded into the background noise.

Noun

1. extraneous noise contaminating sound measurements that cannot be separated from the desired signal