decibeln.

/ˈdɛsɪbɛl/

Etymology: < deci- comb. form + bel n.

The usual unit (equal to one-tenth of a bel) used in comparing the power levels in two electrical communication circuits (or two parts of the same circuit) or the intensities of two sounds; frequently used to express a single power level or sound intensity relative to some reference level (stated or understood). Also used loosely in non-technical contexts. Abbrev. db.

ΘΚΠ

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

decibel1928

phon1932

phonon1932

PNdB1959

db.1975

society > communication > telecommunication > telegraphy or telephony > telephony > [noun] > unit of attenuation or intensity

standard cable1905

neper1922

decibel1928

bel1929

1928 Electr. Communication 7 i. 33/2 If common logarithms are used, the reproduction is obtained in Decibels.

1929 W. H. Martin in Bell Syst. Techn. Jrnl. 8 2 The Bell System has adopted the name ‘decibel’ for the ‘transmission unit’, based on a power ratio of 10·¹... For convenience, the symbol ‘db’ will be employed to indicate the name ‘decibel’.

1930 Discovery Dec. 398/2 The band-pass filter, which follows the low frequency modulator, allows the lower side-band to pass with an attenuation of six decibels.

1930 J. R. Firth Speech iv. 34 In order to measure differences of powers in units of sensation telephone engineers have adopted a logarithmic unit called the decibel (db.).

1937 Nature 28 Aug. 370 The First International Acoustical Conference... The ‘phon’..was adopted as the unit in the subjective scale of equivalent loudness, while the use of the ‘decibel’..was restricted to the scale of the associated energy or pressure level.

1948 Punch Miscellany 54/1 No one misses a single decibel of your conversation.

1953 L. F. Brosnahan Some Old Eng. Sound Changes iii. 28 The differences are measured in decibels, a decibel corresponding roughly to the change in loudness of a sound which is perceived as such.

1955 S. Gibbons Shadow of Sorcerer iv. 37 A deep, fierce droning, louder by many decibels than the noise of wasps.

1958 Engineering 31 Jan. 133/3 Measurement at 800 c/s of the attenuation of a physical circuit with loss up to 10 db.

1959 K. Henney Radio Engin. Handbk. (ed. 5) xxviii. 23 Noise measurements are commonly expressed in decibels above a base, which is approximately at 85 db below 1 mw.

1970 Daily Tel. 4 Nov. 12/4 Patrons are in for a fairly high rate of decibel battering from these two muscular and very loud players.

This entry has not yet been fully updated (first published 1972; most recently modified version published online December 2019).

单词	decibel
释义	decibeln. /ˈdɛsɪbɛl/ Etymology: < deci- comb. form + bel n. The usual unit (equal to one-tenth of a bel) used in comparing the power levels in two electrical communication circuits (or two parts of the same circuit) or the intensities of two sounds; frequently used to express a single power level or sound intensity relative to some reference level (stated or understood). Also used loosely in non-technical contexts. Abbrev. db. ΘΚΠ the world > matter > physics > science of sound > [noun] > unit of sound decibel1928 phon1932 phonon1932 PNdB1959 db.1975 society > communication > telecommunication > telegraphy or telephony > telephony > [noun] > unit of attenuation or intensity standard cable1905 neper1922 decibel1928 bel1929 1928 Electr. Communication 7 i. 33/2 If common logarithms are used, the reproduction is obtained in Decibels. 1929 W. H. Martin in Bell Syst. Techn. Jrnl. 8 2 The Bell System has adopted the name ‘decibel’ for the ‘transmission unit’, based on a power ratio of 10·¹... For convenience, the symbol ‘db’ will be employed to indicate the name ‘decibel’. 1930 Discovery Dec. 398/2 The band-pass filter, which follows the low frequency modulator, allows the lower side-band to pass with an attenuation of six decibels. 1930 J. R. Firth Speech iv. 34 In order to measure differences of powers in units of sensation telephone engineers have adopted a logarithmic unit called the decibel (db.). 1937 Nature 28 Aug. 370 The First International Acoustical Conference... The ‘phon’..was adopted as the unit in the subjective scale of equivalent loudness, while the use of the ‘decibel’..was restricted to the scale of the associated energy or pressure level. 1948 Punch Miscellany 54/1 No one misses a single decibel of your conversation. 1953 L. F. Brosnahan Some Old Eng. Sound Changes iii. 28 The differences are measured in decibels, a decibel corresponding roughly to the change in loudness of a sound which is perceived as such. 1955 S. Gibbons Shadow of Sorcerer iv. 37 A deep, fierce droning, louder by many decibels than the noise of wasps. 1958 Engineering 31 Jan. 133/3 Measurement at 800 c/s of the attenuation of a physical circuit with loss up to 10 db. 1959 K. Henney Radio Engin. Handbk. (ed. 5) xxviii. 23 Noise measurements are commonly expressed in decibels above a base, which is approximately at 85 db below 1 mw. 1970 Daily Tel. 4 Nov. 12/4 Patrons are in for a fairly high rate of decibel battering from these two muscular and very loud players. This entry has not yet been fully updated (first published 1972; most recently modified version published online December 2019). < n.1928
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