ASTM C634-22
(Terminology)Standard Terminology Relating to Building and Environmental Acoustics
Standard Terminology Relating to Building and Environmental Acoustics
SIGNIFICANCE AND USE
3.1 Definitions—Terms and related definitions given in Section 4 are intended for use uniformly and consistently in all building and environmental acoustic test standards in which they appear.
3.2 Definitions of Terms Specific to Each Standard:
3.2.1 As indicated in Section 4, terms and their definitions are intended to provide a precise understanding and interpretation of the building and environmental acoustic test standards in which they appear.
3.2.2 A specific definition of a given term is applicable to the standard or standards in which the term is described and used.
3.2.3 Different definitions of the same term are acceptable provided each one is consistent with and is not in conflict with the standard definition for the same term, that is, the general concept the term describes.
3.2.4 If a standard under the jurisdiction of ASTM Committee E33 specially defines a term, i.e. provides a definition different in any way from what is given in Section 4 of Terminology C634, that standard shall list the term and its description under the subheading, Definitions of Terms Specific to This Standard.
3.2.4.1 Discussion—The mandatory language of section 3.2.4 is consistent with the mandatory language from §E2 of Form and Style for ASTM Standards (April 2020) and with the ASTM Committee E33 bylaws in place when this standard was published; it reflects a situation that exists, it does not prescribe anything.
3.3 Definitions for some terms associated with building and environmental acoustic issues and not included in Terminology C634 are found in ISO/TR 25417 or IEEE P260.4. When discrepancies exist, the definition in Terminology C634 shall prevail.
SCOPE
1.1 This terminology covers terms, related definitions, and descriptions of terms used or likely to be used in building and environmental acoustics standards. Definitions of terms are special-purpose definitions that are consistent with the standard definitions but are written to ensure that a specific building and environmental acoustics standard is properly understood and precisely interpreted. The primary focus of this document is upon terms, definitions and descriptions found within standards under the jurisdiction of ASTM Committee E33; however, terms, definitions and descriptions that are of general interest to the field of acoustics are also included.
1.2 This building and environmental acoustics standard cannot be used to provide quantitative measures.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C634 − 22
Standard Terminology Relating to
1
Building and Environmental Acoustics
This standard is issued under the fixed designation C634; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
In some of the entries, those that are measures of physical quantities, the term is followed by several
items: an abbreviation or a symbol, or both, the dimensions of quantities, the measurement units, and
the part of speech. The abbreviation, where applicable, indicates the term as typically referenced. The
symbol stands for the magnitude of the quantity in mathematical expressions. The dimensions of a
quantity express its measure in terms of three fundamental quantities: M for mass, L for length, and
T for time. Speed, for instance, is the quotient obtained when the distance an object moves is divided
−1
by the time involved. The dimensions are [LT ], the negative exponent indicating division. The
measurement units are consistently in SI, Le Système International d’Unités. Those still using the cgs
(centimetre-gram-second) or the inchpound system of units are referred for most of the conversion
factors to IEEE/ ASTM SI 10. Some conversion factors are listed in Section 6 of this document for
convenient reference.
The dimensions of a quantity are the same regardless of the units in which the quantity is measured.
−1
Speed has the dimensions [LT ] whether it is measured in miles per hour, feet per second, or metres
per second. Quantities with different dimensions are not the same. Flow resistance and specific flow
resistance, for instance, are quantities of different kinds even though the names are similar. On the
other hand, quantities with the same dimensions are not necessarily of the same kind. Sound energy
−1 −2
density, for instance, has the same dimensions as sound pressure, [ML T ], but it is not a kind of
2
sound pressure. Nor is absorption with the dimensions [L ] a kind of area.
1. Scope responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
1.1 This terminology covers terms, related definitions, and
mine the applicability of regulatory limitations prior to use.
descriptions of terms used or likely to be used in building and
1.4 This international standard was developed in accor-
environmental acoustics standards. Definitions of terms are
dance with internationally recognized principles on standard-
special-purpose definitions that are consistent with the standard
ization established in the Decision on Principles for the
definitions but are written to ensure that a specific building and
Development of International Standards, Guides and Recom-
environmental acoustics standard is properly understood and
mendations issued by the World Trade Organization Technical
precisely interpreted. The primary focus of this document is
Barriers to Trade (TBT) Committee.
upon terms, definitions and descriptions found within standards
under the jurisdiction of ASTM Committee E33; however,
2. Referenced Documents
terms, definitions and descriptions that are of general interest to
2
2.1 ASTM Standards:
the field of acoustics are also included.
C367/C367M Test Methods for Strength Properties of Pre-
1.2 This building and environmental acoustics standard
fabricated Architectural Acoustical Tile or Lay-In Ceiling
cannot be used to provide quantitative measures.
Panels
1.3 This standard does not purport to address all of the C384 Test Method for Impedance and Absorption of Acous-
safety concerns, if any, associated with its use. It is the tical Materials by Impedance Tube Method
C423 Test Method for Sound Absorption and Sound Absorp-
tion Coefficients by the Reverberation Room Method
1
This terminology is under the jurisdiction of ASTM Committee E33 on
Building and Environmental Acoustics and is the direct responsibility of Subcom-
2
mittee E33.07 on Definitions and Editorial. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Oct. 1, 2022. Published February 2023. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1969. Last previous edition approved in 2021 as C634 – 13 (2021). Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/C0634-22. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959.
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C634 − 13 (Reapproved 2021) C634 − 22
Standard Terminology Relating to
1
Building and Environmental Acoustics
This standard is issued under the fixed designation C634; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
In some of the entries, those that are measures of physical quantities, the term is followed by several
items: an abbreviation or a symbol, or both, the dimensions of quantities, the measurement units, and
the part of speech. The abbreviation, where applicable, indicates the term as typically referenced. The
symbol stands for the magnitude of the quantity in mathematical expressions. The dimensions of a
quantity express its measure in terms of three fundamental quantities: M for mass, L for length, and
T for time. Speed, for instance, is the quotient obtained when the distance an object moves is divided
−1
by the time involved. The dimensions are [LT ], the negative exponent indicating division. The
measurement units are consistently in SI, Le Système International d’Unités. Those still using the cgs
(centimetre-gram-second) or the inchpound system of units are referred for most of the conversion
factors to IEEE/ ASTM SI 10. Some conversion factors are listed in Section 56 of this document for
convenient reference.
The dimensions of a quantity are the same regardless of the units in which the quantity is measured.
−1
Speed has the dimensions [LT ] whether it is measured in miles per hour, feet per second, or metres
per second. Quantities with different dimensions are not the same. Flow resistance and specific flow
resistance, for instance, are quantities of different kinds even though the names are similar. On the
other hand, quantities with the same dimensions are not necessarily of the same kind. Sound energy
−1 −2
density, for instance, has the same dimensions as sound pressure, [ML T ], but it is not a kind of
2
sound pressure. Nor is absorption with the dimensions [L ] a kind of area.
1. Scope
1.1 This terminology covers terms and definitions related to environmental acoustics. Only definitions common to two or more
standards under the jurisdiction of Committee E33 are listed here. The purpose of this terminology is to promote uniformity of key
definitions. Definitions pertinent to only one standard and exceptions to the definitions listed below are contained in the individual
standards and should be used when following those standards.terms, related definitions, and descriptions of terms used or likely
to be used in building and environmental acoustics standards. Definitions of terms are special-purpose definitions that are
consistent with the standard definitions but are written to ensure that a specific building and environmental acoustics standard is
properly understood and precisely interpreted. The primary focus of this document is upon terms, definitions and descriptions
found within standards under the jurisdiction of ASTM Committee E33; however, terms, definitions and descriptions that are of
general interest to the field of acoustics are also included.
1.2 This building and environmental acoustics standard cannot be used to provide quantitative measures.
1
This terminology is under the jurisdiction of ASTM Committee E33 on Building and Environmental Acoustics and is the direct responsibility of Subcommittee E33.07
on Definitions and Editorial.
Current edition approved Jan. 1, 2021Oct. 1, 2022. Published February 2021February 2023. Originally approved in 1969. Last previous edition approved in 20132021 as
ε1
C634 – 13 (2021). . DOI: 10.1520/C0634-13R21.10.1520/C0634-22.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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C634 − 22
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
...
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