Feb 27, 2017 22:45
7 yrs ago
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Spanish term

disminuido en 5

Spanish to English Tech/Engineering Physics Noise emissions (Chile)
From a document on noise emissions legislation from Chile. Ideally I'd like help with the translation of the entire phrase, as it is a key part of the document:

"Para cada medición realizada, se elegirá el mayor valor entre el NPSeq y el NPSmáx disminuido en 5 dB(A), y se calculará el promedio aritmético de los valores obtenidos".

NOTE: NPSeq = Equivalent Continuous Sound Pressure Level; NPSmáx = Maximum Sound Pressure Level.

Discussion

Neil MacLean (asker) Feb 28, 2017:
Thank you
Jennifer Levey Feb 28, 2017:
greater of se elegirá el mayor valor entre el NPSeq y el NPSmáx disminuido en 5 dB(A), y se calculará el promedio aritmético de los valores obtenidos
-->
select the greater of NPSeq and NPSmax, reduced by 5 dB(A), and calculate the arithmetic mean of the selected values

The point is that the arithmetic average is calculated from a mixture of NPSeq values and NPSmax-5 values. The acoustic "feature" this caters for is the fact that a high value of NPSeq may be more harmful (cause more annoyance) than the NPSmax value measured over the same period. This may be the case if the noise is fairly constant but has occasional short peaks. The 5dB(A) reduction applied to NPSmax reflects the "annoyance differential" between continuous noise and noise spikes.
Neil MacLean (asker) Feb 28, 2017:
So could the full sentence be: For each measurement performed, the highest/higher value of the NPSeq and the NPSmáx (reduced by 5dBA), will be selected, and the arithmetic mean of the obtained values will be calculated (?) (bearing in mind what Robin Levey says about the 5dBA being subtracted from only the NPSmáx - hence the brackets. Also, would it be 'higher' value or 'highest' value? i.e. is the value referring to the relation between the two values or is it the highest reading in each of the measurements?)
Jennifer Levey Feb 27, 2017:
@Asker Both answers you have so far (from Phil and Taña) are valid. But to understand the sentence as a whole you need to appreciate that "disminuido en 5 db(A)" applies only to the value of NPSmáx.

Proposed translations

+1
5 mins
Selected

less 5

Or minus 5. Disminuir is to decrease.

--------------------------------------------------
Note added at 8 mins (2017-02-27 22:53:51 GMT)
--------------------------------------------------

For each measurement, choose the greater of NPSeq and NPSmax less 5 db(A) and calculate the arithmetic mean of the resulting values.
Peer comment(s):

agree Jennifer Levey : OK.
39 mins
Something went wrong...
4 KudoZ points awarded for this answer. Comment: "Thank you"
+6
22 mins

reduced by 5 dB(A)


....... the Equivalent Continuous Sound Pressure Level (NPSeq) and the Maximum Sound Pressure Level (NPSmáx), reduced by 5 dB(A), and the .... avaerage .... will be calculated (or words to that effect).


Noise Pollution Control - Springer
link.springer.com/content/pdf/10.1007%2F978-3-319-01234-6_4.pdf
The intensity of sound is measured in sound pressure levels (SPL) and common .... measuring the continuous equivalent level, which is defined as, the constant sound ... Noise limits for each item
of equipment shall be derived from the general noise ..... equipment noise limit shall be reduced by 5 dB(A) for such equipment.

[DOC] Noise Control - DEP 31.10.00.30
www.pogc.ir/portals/0/maghalat/891013.10.doc
The equipment noise limit shall be ***reduced by 5 dB(A)*** for such equipment.
Peer comment(s):

agree Steven Huddleston
16 mins
Thank you, Steven.
agree Jennifer Levey : Better.
24 mins
Thank you, Robin.
agree Wendy Streitparth
9 hrs
Thank you Wendy.
agree franglish
9 hrs
Thank you so much.
agree Marie Wilson
10 hrs
Thank you Marie. Un abrazo.
agree neilmac
10 hrs
Thank you Neil.
Something went wrong...
3 hrs

reduced in 5db (decibels)

Según el contexto, "disminuido en 5", está incompleto debería decir, "disminuido en 5db" al tratarse de los términos usados. Por tanto, se trata de un sistema de medición de ruido usando la escala DB (decibel, 1/10 of Bel) para este tipo de datos. Esto significa que hay dos cantidades representan ruido en potencia que se dividen y se calculan los decibelios =10 logaritmo del cociente entre la dos potencias de ruido. NPS max y NPSeq forman ese cociente => 10 logaritmo del cociente= x decibelios. (ver la tabla de cálculo de la última referencia, Cálculo de DBs), que corresponde a **3.16 veces** para 5 dbs (decibelios). El resultado será "power reduced in 5db"

The decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical ... (Field quantity ratio is also referred to as root-power ratio or amplitude ratio.) .... five one-thousandths of a bel would normally be written '0.05 dB', and not '5 mB'. ...... 1025. … the decibel represents a **reduction in power **of 1.258 times

The decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity. One of these values is often a standard reference value, in which case the decibel is used to express the level[a] of the other value relative to this reference
the number of decibels is ten times the logarithm to base 10 of the ratio of two power quantities
https://en.wikipedia.org/wiki/Decibel

El decibelio o decibel,3 4 con símbolo dB, expresa una razón entre cantidades y no una cantidad. El decibel expresa cuantas veces más o cuantas veces menos, pero no la cantidad exacta. Es una expresión que no es lineal, sino logarítmica. Es una unidad de medida relativa. En audiofrecuencias un cambio de 1 decibel (dB) es apenas (si hay suerte) notado.
https://es.wikipedia.org/wiki/Decibel

DB calculator
+30 dB 1000
+20 dB 100
16 dB 40
13 dB 20
10 dB 10
9 dB 8
8 dB 6.31
7 dB 5.01
6 dB 4
5 dB 3.16
http://www.satsig.net/lnb/db-calculator.htm

This means that reduced in 5 db the ratio of two power quantities corresponds to be reduced 3.16 times.
Peer comment(s):

neutral Jennifer Levey : The ST in fact says "disminuido en 5db(A)" - which is absolutely complete and correct - so your 1st sentence is irrelevant. All your references to "dB", including in your proposed translation, should read "dB(A)". This is acoustics, not electronics.
9 hrs
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