# coefficient « alpha sabine »

## English translation: info.

 08:47 Apr 7, 2005
French to English translations [PRO]
Tech/Engineering - Construction / Civil Engineering
 French term or phrase: coefficient « alpha sabine » A s’était rapproché de B pour avoir des conseils quand à la réduction du bruit. B avait souhaité connaître les spécifications techniques des cloisons, notamment le coefficient « alpha sabine » qui est l’indicateur d’isolation/transmission. There are a few occurrences of 'alpha sabine coefficient' in English on the internet, but they appear to be hasty translations. Does anyone know if the there is a standard English equivalent? Many thanks in advance for any help...
 Local time: 04:45
 English translation:info. Explanation:From my notes: Alpha Sabine ([alpha symbol] Sabine) Measurement of noise reduction as per NRC, sabin Scott Building <> <> [Doct. of Arch. & Const., ed. Cyril M. Harris, McGHill] [Scott / Penguin Dict of Building]--------------------------------------------------Note added at 4 hrs 21 mins (2005-04-07 13:09:10 GMT)--------------------------------------------------\"Alpha\" does not seem to be used (much) in English though. The material’s absorptivity will be quantified by its sound absorption coefficient or alpha sabin. For a highly sound absorbing material, it tends towards 1, and for a very reflecting material it tends towards 0. [www.acoustock.com/faq/index.jsp?locale=en] Sound Absorption Three terms are introduced to define and evaluate sound absorption. These are the Sound Absorption Coefficient, Sabin, and Noise Reduction Coefficient. The Sound Absorption Coefficient is a measure of the proportion of the sound striking a surface which is absorbed by that surface, and is usually given for a particular frequency. Thus, a surface which would absorb 100% of the incident sound would have a Sound Absorption Coefficient of 1.00, while a surface which absorbs 45% of the sound, and reflects 55% of it, would have a Sound Absorption Coefficient of 0.45. A Sabin or square-foot Unit of Absorption is defined as the amount of sound absorbed by one square foot of surface having a Sound Absorption Coefficient of 1.00. The number of Sabins (Absorption Units) of a given area is then the product of the area and the Sound Absorption Coefficient. 100 sq. ft. of a surface with a Sound Absorption Coefficient of 0.25 furnishes 25 Sabins (Absorption Units). Most materials are tested at frequencies from 125 to 4000 cycles per second (cps) in octave steps. The Noise Reduction Coefficient is the average of the Sound Absorption Coefficient at 250,000, 1000 and 2000 cps in octave steps. The Table lists approximate values of the Noise Reduction Coefficients of numerous materials. [http://www.norliteagg.com/maps/sound.htm]
Selected response from:

Bourth (X)
Local time: 05:45
 Many thanks to both you for all the help, greatly appreciated as always. Cheers!4 KudoZ points were awarded for this answer

4 +1info.
 Bourth (X)
4See comment below... [not for grading)
 Tony M

29 mins   confidence:
coefficient « alpha sabine »
See comment below... [not for grading)

Explanation:
This glossary looks ever so useful:

http://www.owenscorning.com/around/sound/glossary.asp

And this is just one Google that appears relevant:

Glossary of Terms
... Noise in which the acoustic energy is distributed over a relatively wide ... Unit, metric sabin. In a reverberant room of volume V, speed of sound c, ...

users.aol.com/inceusa/glossary.html

[I'm really only posting this so these handy links will be associated with the question for future use!]

 Tony MFranceLocal time: 05:45Works in fieldNative speaker of: EnglishPRO pts in category: 1174

12 mins   confidence: peer agreement (net): +1
coefficient « alpha sabine »
info.

Explanation:
From my notes:
Alpha Sabine ([alpha symbol] Sabine) Measurement of noise reduction as per NRC, sabin Scott Building

<<sabin. The unit of sound absorption, equivalent to the absorption of 1m² of open window (after Dr Sabine, pioneer in acoustics]>>

<<sabin. A unit of sound absorption equivalent to 1 sq ft of perfectly absorptive surface. Also see metric sabin ...

metric sabin. A unit of sound absorption equivalent to 1 sq m of perfectly absorptive surface.>>
[Doct. of Arch. & Const., ed. Cyril M. Harris, McGHill]
[Scott / Penguin Dict of Building]

--------------------------------------------------
Note added at 4 hrs 21 mins (2005-04-07 13:09:10 GMT)
--------------------------------------------------

\"Alpha\" does not seem to be used (much) in English though.

The material’s absorptivity will be quantified by its sound absorption coefficient or alpha sabin. For a highly sound absorbing material, it tends towards 1, and for a very reflecting material it tends towards 0.
[www.acoustock.com/faq/index.jsp?locale=en]

Sound Absorption
Three terms are introduced to define and evaluate sound absorption. These are the Sound Absorption Coefficient, Sabin, and Noise Reduction Coefficient. The Sound Absorption Coefficient is a measure of the proportion of the sound striking a surface which is absorbed by that surface, and is usually given for a particular frequency. Thus, a surface which would absorb 100% of the incident sound would have a Sound Absorption Coefficient of 1.00, while a surface which absorbs 45% of the sound, and reflects 55% of it, would have a Sound Absorption Coefficient of 0.45. A Sabin or square-foot Unit of Absorption is defined as the amount of sound absorbed by one square foot of surface having a Sound Absorption Coefficient of 1.00. The number of Sabins (Absorption Units) of a given area is then the product of the area and the Sound Absorption Coefficient. 100 sq. ft. of a surface with a Sound Absorption Coefficient of 0.25 furnishes 25 Sabins (Absorption Units). Most materials are tested at frequencies from 125 to 4000 cycles per second (cps) in octave steps. The Noise Reduction Coefficient is the average of the Sound Absorption Coefficient at 250,000, 1000 and 2000 cps in octave steps. The Table lists approximate values of the Noise Reduction Coefficients of numerous materials.
[http://www.norliteagg.com/maps/sound.htm]

 Bourth (X)Local time: 05:45Specializes in fieldNative speaker of: EnglishPRO pts in category: 4135
 Many thanks to both you for all the help, greatly appreciated as always. Cheers!

agree  Tony M: I don't have specialist knowledge to authoritatively corroborate this, but I am unaware of another term...
 12 mins

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