Phon


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phon

[fän]
(acoustics)
A unit of loudness level; the loudness level, in phons, of a sound is numerically equal to the sound pressure level, in decibels, of a 1000-hertz reference tone which is judged by listeners to be equally loud to the sound under evaluation.

Phon

 

the unit of loudness level. Since sounds of differing intensity—that is, of differing sound pressure—may have the same loudness at different frequencies, the loudness of a sound is evaluated by comparing it with the loudness of a pure reference tone, usually a tone with a frequency of 1,000 hertz (Hz). One phon is the difference between the loudness levels of two sounds of a given frequency whose intensities, or sound levels, at a frequency of 1,000 Hz differ by 1 decibel (dB). For pure tones with a frequency of 1,000 Hz, a difference of 1 phon in loudness level is equal to a difference of 1 dB in sound level.

loudness level

Of a sound, the sound-pressure level of an equally loud 1,000-Hz pure tone, expressed in units called phons.
References in periodicals archive ?
Davutoglu also phoned the former Greek Foreign Minister Dimitrios Droutsas on Friday and had a conversation.
When we phoned the force's press office on April 9, they traced it within half an hour.
We phoned Columbus Coach Travel and company spokesman Mike Caldon said he would make sure the problem was resolved right away.
The next day a Helmsley associate phoned to ask him to come back to his old job.
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Then, as a last insult to the Schecks, attendants phoned doctors, staff, even insurance companies, before letting the family know an hour later that their daughter had been discovered near death.
The study does not suggest that people who were using cellular phones caused collisions, Redelmeier emphasized.
Her husband returned home and phoned their handyman to check it was him who'd been at the door.
I phoned Robert Plant and he offers such unbelievably good advice and he really saw me through that moment and then when we got the all clear again he said 'fine, OK well I'm not going to be phoning you every single day now".'.
I phoned them eight times in all as the animal concerned was neglected, underfed and beaten.
He had overheard the problem I had and asked the garage if they would normally have phoned the police.
Mr Jones phoned the police at 2am and said: "I want to report a burglar in my shed." The sergeant said: "Due to cuts we've nobody available." At 2.05am Mr Jones phoned again and said: "It's OK now...