Definition

Noun: 1. Extraneous signals that interfere with or obscure a primary signal or phenomenon: A "background signal" refers to any unwanted or irrelevant electrical, electromagnetic, or acoustic signals present in a system or environment. These signals are not part of the intended data or measurement but can be confused with or mask the primary phenomenon being observed, analyzed, or communicated.

Usage Examples

• Noun:
  • The radio telescope's data was corrupted by cosmic background signals from distant galaxies.
  • To get an accurate reading, the scientist had to filter out the background signal from the laboratory equipment.
  • The microphone picked up a lot of background signal from the air conditioning, making the interview difficult to understand.

Advanced Usage

• "To distinguish from the background signal": To successfully separate the desired data or primary signal from the interfering noise.
  • Advanced software is needed to distinguish the weak planetary radio emissions from the cosmic background signal.
• "Signal-to-background ratio": A technical measurement comparing the strength of the desired signal to the level of the interfering background noise. A high ratio is desirable.
  • The experiment's success depends on achieving a high signal-to-background ratio.

Variants and Related Words

• Background noise (n): Often used interchangeably in non-technical contexts, especially for audible interference.
  • There was too much background noise on the call.
• Noise (n): In scientific and technical contexts, "noise" is a broad term for any unwanted disturbance, which includes background signals.
  • The sensor's readings were affected by electrical noise.
• Interference (n): A general term for any signal that disrupts or degrades a desired signal.

Synonyms

• Interference
• Noise (in a technical sense)
• Static (specifically for audio or radio signals)
• Crosstalk (specifically in telecommunications)

Related Phrases

• Background radiation: A specific type of background signal consisting of ionizing radiation from environmental sources.
  • Geiger counters must account for natural background radiation.
• Cosmic microwave background (CMB): A specific, uniform background signal of microwave radiation from the early universe, crucial in cosmology.

Noun

1. extraneous signals that can be confused with the phenomenon to be observed or measured
   • they got a bad connection and could hardly hear one another over the background signals