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ARMY - MIL-M-6/7 - METER, DECIBEL, PANEL TYPE (SEALED FLUSH MOUNTING, ROUND FLANGE, 3-1/2 INCH), STYLE 36 Organization: ARMY
Date: 1957-05-10
ARMY - MIL-M-6/7 CANC NOTICE 1 - METER, DECIBEL, PANEL TYPE (SEALED FLUSH MOUNTING, ROUND FLANGE, 3-1/2 INCH), STYLE 36 Organization: ARMY
Date: 1960-08-10
NPFC - MIL-PRF-10304/10 - METERS, ELECTRICAL INDICATING, PANEL TYPE, RUGGEDIZED: DECIBEL (FLUSH MOUNTING, ROUND FLANGE, 3.5 INCH), STYLE 36 Organization: NPFC
NPFC - MIL-PRF-10304/19 - METERS, ELECTRICAL INDICATING, PANEL TYPE, RUGGEDIZED: SPECIAL DECIBEL, (FLUSH MOUNTING, SQUARE FLANGE, 1.5 INCH, STYLE 13) Organization: NPFC
NPFC - MIL-M-10304/19 - METERS, ELECTRICAL INDICATING, PANEL TYPE, RUGGEDIZED: SPECIAL DECIBEL (FLUSH MOUNTING, SQUARE FLANGE, 1-1/2 INCH) STYLE 13 Organization: NPFC
Date: 1997-11-04
EPA - 40 CFR PART 201 - NOISE EMISSION STANDARDS FOR TRANSPORTATION EQUIPMENT; INTERSTATE RAIL CARRIERS Organization: EPA
Date: 2017-07-01
Description: (b) Car Coupling Sound means a sound which is heard and identified by the observer as that of car coupling impact, and that causes a sound level meter indicator (FAST) to register an increase of at least ten decibels above the level observed immediately before hearing the sound.
EPA - 40 CFR PART 201 - NOISE EMISSION STANDARDS FOR TRANSPORTATION EQUIPMENT; INTERSTATE RAIL CARRIERS Organization: EPA
Date: 2016-07-01
Description: (b) Car Coupling Sound means a sound which is heard and identified by the observer as that of car coupling impact, and that causes a sound level meter indicator (FAST) to register an increase of at least ten decibels above the level observed immediately before hearing the sound.
NASA-TP-1301 - A CORRELATION OF MIXING NOISE FROM COANNULAR JETS WITH INVERTED FLOW PROFILES Organization: NASA
Date: 1979-01-01
Description: The maximum sound power reduction is found to be about 4 decibels. Directivity indices and a special set of spectral curves were developed to describe the characteristic double peak spectra of coannular jet noise.
ITU-T - P.56 - (PRE-PUBLISHED) OBJECTIVE MEASUREMENT OF ACTIVE SPEECH LEVEL Organization: ITU-T
Date: 2011-03-01
Description: Active speech level shall be measured and reported in decibels relative to a stated reference according to the methods described below, namely: – Method A – Measuring a quantity called speech volume, used for the purpose of real-time control of speech level (see clause 4); – Method B – Measuring a quantity called active speech level, used for other purposes (see clause 5).
ITU-T - P.56 - (PRE-PUBLISHED) OBJECTIVE MEASUREMENT OF ACTIVE SPEECH LEVEL Organization: ITU-T
Date: 2011-12-01
Description: Active speech level shall be measured and reported in decibels relative to a stated reference according to the methods described below, namely: – Method A – Measuring a quantity called speech volume, used for the purpose of real-time control of speech level (see clause 4); – Method B – Measuring a quantity called active speech level, used for other purposes (see clause 5).
ASA - ANSI/ASA S3.4 - AMERICAN NATIONAL STANDARD PROCEDURE FOR THE COMPUTATION OF LOUDNESS OF STEADY SOUNDS Organization: ASA
Date: 2007-05-24
Description: NOTE 1 The equal-loudness contour for narrow-band noise in a free field differs from that in the diffuse field, but the difference measured at 1/3-octave-band center frequencies varies from -2.0 to +4.3 decibels with the mean difference equal to only 0.8 decibels. These differences do not significantly affect calculations for broadband spectra.

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