TCVN 7878-2:2018 – Acoustics – Description, measurement and assessment of environmental noise – Part 2: Determination of environmental noise levels

1. Scope

This standard describes how to determine sound pressure levels by direct measurement, by extrapolation of measurement results from mean calculations, or by exclusion, to serve as a basis for environmental noise assessment. Recommendations specify preferred conditions for measurement or calculation applicable in cases where other specifications do not apply. This standard can be used for measurement with any frequency weighting or in any frequency band. Guidance is also provided for assessing the uncertainty of environmental noise assessment results.

NOTE 1: Since TCVN 7878-2 (ISO 1996-2) deals with measurements under practical operating conditions, no relation exists between this standard and other TCVN standards specifying measurements of noise emission under specified operating conditions.

NOTE 2: For general purposes, frequency and time weighting subscripts have been omitted in this standard.

2. Normative references

The following referenced documents are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

TCVN 7878-1:2008 (ISO 1996-1:2003), Acoustics – Description, measurement and assessment of environmental noise – Part 1: Basic quantities and assessment procedures.

ISO 7196, Acoustics – Frequency – weighting characteristic for infrasound measurements (Acoustics – Frequency – weighting characteristic for infrasound measurements).

IEC 60942:2003, Electroacoustics – Sound calibrator (Electroacoustics – Sound calibrator).

IEC 61260:1995, Electroacoustics – Octave-band and fractional-octave band filters (Electroacoustics – Octave-band and fractional-octave band filters)

IEC 61672-1:2002, Electroacoustics – Sound level meters – Part 1: Specifications (Electroacoustics – Sound level meters – Part 1: Specifications).

Guide to the expression of uncertainty in measurement (GUM), BIPM/IEC/IFCC/ISO/IUPAC/IUPAP/OlML, 1993 (corrected and reprinted, 1995) (Guide to the expression of uncertainty in measurement (GUM), BIPM/IEC/IFCC/ISO/IUPAC/IUPAP/OlML, 1993 (corrected and reprinted, 1995)).