phonn.

Brit.

/fɒn/, U.S.

/fɑn/

Inflections: Plural phons, unchanged.

Origin: A borrowing from German. Etymon: German Phon.

Etymology: < German Phon (H. Barkhausen 1926, in Zeitschr. f. techn. Physik 7 601/1) < ancient Greek ϕωνή sound (see -phone comb. form).

Acoustics.

A unit of perceived loudness, defined so that the loudness in phons of any sound is numerically equal to the intensity in decibels of a pure 1000 Hz tone judged to be equally loud. Formerly also used to express intensity (equivalent to decibel).

ΘΚΠ

the world > matter > physics > science of sound > [noun] > unit of sound

decibel1928

phon1932

phonon1932

PNdB1959

db.1975

1932 B.B.C. Techn. Tables & Gloss. 63/2 Two noises may be compared in strength in sensation units or phons by comparing the attenuations necessary to reduce each to the threshold of audibility.

1932 Engineering 9 Sept. 314/3 For quantitative measurements we turn to a unit called the decibel. [Note] Called the ‘phon’ in Germany.

1935 Sunday Times 13 Oct. 18/3 Now a machine exists which measures units of noise in ‘phons’, and no vehicle will be allowed after a certain date to make more than 90 phons of noise at a speed of 30 m.p.h.

1937 A. H. David Noise iv. 46 Limitation of the decibel to intensity ratios and the phon to loudness scales has been adopted by the British Standards Institution.

1959 G. R. Partridge Princ. Electronic Instruments xvi. 303 A loudness of 70 phons requires 80 db intensity at 70 cycles.

1974 Daily Colonist (Victoria, Brit. Columbia) 22 Nov. 16/5 Tokyo metropolitan government standards set permissible noise levels at 40 phon..in the morning and evening and at 45 phon during the day.

1992 Brit. Jrnl. Audiology 26 389/2 This effective loudness level is essentially the same as tinnitus loudness expressed in phons except for the difference of reference level.

This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022).

单词	phon
释义	phonn. Brit. /fɒn/, U.S. /fɑn/ Inflections: Plural phons, unchanged. Origin: A borrowing from German. Etymon: German Phon. Etymology: < German Phon (H. Barkhausen 1926, in Zeitschr. f. techn. Physik 7 601/1) < ancient Greek ϕωνή sound (see -phone comb. form). Acoustics. A unit of perceived loudness, defined so that the loudness in phons of any sound is numerically equal to the intensity in decibels of a pure 1000 Hz tone judged to be equally loud. Formerly also used to express intensity (equivalent to decibel). ΘΚΠ the world > matter > physics > science of sound > [noun] > unit of sound decibel1928 phon1932 phonon1932 PNdB1959 db.1975 1932 B.B.C. Techn. Tables & Gloss. 63/2 Two noises may be compared in strength in sensation units or phons by comparing the attenuations necessary to reduce each to the threshold of audibility. 1932 Engineering 9 Sept. 314/3 For quantitative measurements we turn to a unit called the decibel. [Note] Called the ‘phon’ in Germany. 1935 Sunday Times 13 Oct. 18/3 Now a machine exists which measures units of noise in ‘phons’, and no vehicle will be allowed after a certain date to make more than 90 phons of noise at a speed of 30 m.p.h. 1937 A. H. David Noise iv. 46 Limitation of the decibel to intensity ratios and the phon to loudness scales has been adopted by the British Standards Institution. 1959 G. R. Partridge Princ. Electronic Instruments xvi. 303 A loudness of 70 phons requires 80 db intensity at 70 cycles. 1974 Daily Colonist (Victoria, Brit. Columbia) 22 Nov. 16/5 Tokyo metropolitan government standards set permissible noise levels at 40 phon..in the morning and evening and at 45 phon during the day. 1992 Brit. Jrnl. Audiology 26 389/2 This effective loudness level is essentially the same as tinnitus loudness expressed in phons except for the difference of reference level. This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022). < n.1932
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