Definition

1. Noun:
   • A unit of subjective loudness: A "phon" is a unit used in acoustics and psychoacoustics to measure the perceived loudness level of a sound, as heard by the human ear. It is a subjective measure, meaning it is based on human perception rather than purely physical intensity. One phon is defined as the loudness level of a sound that is judged by a typical listener to be equal in loudness to a 1,000-hertz tone at a sound pressure level of 1 decibel.

Examples of Usage

• Noun:
  • The noise from the construction site was measured at 80 phons.
  • A whisper is about 20 phons, while a normal conversation is around 60 phons.
  • The study compared the loudness, in phons, of different musical instruments.

Advanced Usage

• "Loudness level in phons": This is the standard phrase for reporting measurements using this unit.
  • The loudness level of the alarm was 90 phons, which is considered very intense.

Variants and Related Words

• Phoneme (n): A distinct unit of sound in a language that can distinguish one word from another (e.g., /p/ and /b/ in "pat" and "bat"). This is a related linguistic term but is not a variant of "phon."
• Phonics (n): A method of teaching reading by correlating sounds with letters or groups of letters.

Synonyms

• Loudness unit: A general term for any unit measuring perceived loudness. "Phon" is a specific type of loudness unit.
• Sone: Another unit of subjective loudness. One sone is defined as the loudness of a 40-phon tone. The sone scale is linear (twice as many sones sounds twice as loud), while the phon scale is logarithmic.

Related Phrases

(This word is a scientific unit and does not have idiomatic expressions or phrasal verbs.)

Noun

1. a unit of subjective loudness