ISO/TR 17534-4:2020 PDF

Acoustics — Software for the calculation of sound outdoors — Part 4: Recommendations for a quality assured implementation of the COMMISSION DIRECTIVE (EU) 2015/996 in software according to ISO 17534-1

First page of standard ISO/TR 17534-4:2020

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Title (English):

ISO/TR 17534-4:2020

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 124
Publication date:: November 16, 2020
Edition:: ISO TR 17534 edition 1 version 1
ICS:: 17.140.01

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Description (English):

This document facilitates a standardized interpretation and a verifiably consistent software implementation of the sound propagation part of the calculation method CNOSSOS-EU:2015 according to ISO 17534-1. Other parts of CNOSSOS-EU:2015, such as the source models or the calculation method for aircraft noise, are beyond the scope of this document. This document provides an agreed interpretation of ambiguous aspects of the sound propagation part of CNOSSOS-EU:2015, a set of illustrative test cases along with reference solutions, and an example of a template form for the declaration of conformity for software manufacturers.

Technical details

Technical committee: ISO/TC 43/SC 1 - Noise
SKU: ISO/TR 17534-4:2020

Abstract

Overview

ISO/TR 17534-4:2020 provides recommendations for a quality‑assured, verifiable software implementation of the sound propagation part of the CNOSSOS‑EU calculation method (COMMISSION DIRECTIVE (EU) 2015/996), in accordance with ISO 17534‑1. The technical report clarifies ambiguous aspects of CNOSSOS‑EU:2015, supplies a comprehensive set of illustrative test cases with reference solutions, and offers an example template for a declaration of conformity for software vendors. Note: source models and aircraft noise calculations are outside this document’s scope.

Key topics and technical requirements

Standardized interpretation of CNOSSOS‑EU:2015 to ensure consistent software behavior across implementations.
Detailed handling of ambiguous propagation issues, including:
- sloping objects and equivalent heights
- ground factors and spatially varying ground properties
- octave band treatment and centre frequencies
- diffraction (including lateral and retro‑diffraction) and Rayleigh’s criterion
- reflection on near‑vertical structures and complex object interactions
- distances and geometry conventions used in CNOSSOS‑EU equations
A structured test-suite (TC01–TC28) covering flat and varying ground, barriers, buildings, long‑distance propagation and combinations of effects; each test case includes intermediate and final reference results for validation.
Quality assurance guidance for software developers: documentation identification, agreed interpretations of ambiguous clauses, and a sample declaration of conformity to support compliance claims.
Normative references include ISO 17534‑1, ISO/TR 17534‑2, and the COMMISSION DIRECTIVE (EU) 2015/996 (CNOSSOS‑EU:2015).

Applications and who should use it

Acoustic software developers implementing outdoor sound propagation modules to ensure CNOSSOS‑EU compliance and interoperable outputs.
Environmental consultants and noise modelers validating software and interpreting propagation results for strategic noise mapping.
Regulatory bodies, local authorities and project auditors who need verifiable conformity checks for noise‑mapping tools under EU directives.
QA engineers and test laboratories using the provided test cases and reference solutions to perform independent validation and regression testing.

Related standards

ISO 17534‑1 - Quality requirements and quality assurance for outdoor sound calculation software
ISO/TR 17534‑2 - General recommendations for test cases and QA interface
COMMISSION DIRECTIVE (EU) 2015/996 - CNOSSOS‑EU:2015 (source method document)

ISO/TR 17534‑4:2020 is a practical resource for ensuring a quality‑assured implementation of CNOSSOS‑EU sound propagation in software, improving consistency and comparability of environmental noise assessments across organizations and EU Member States.

Related standards

Mentioned in the description and other ISO standards

Abstract

Overview

Key topics and technical requirements

Standardized interpretation of CNOSSOS‑EU:2015 to ensure consistent software behavior across implementations.
Detailed handling of ambiguous propagation issues, including:
- sloping objects and equivalent heights
- ground factors and spatially varying ground properties
- octave band treatment and centre frequencies
- diffraction (including lateral and retro‑diffraction) and Rayleigh’s criterion
- reflection on near‑vertical structures and complex object interactions
- distances and geometry conventions used in CNOSSOS‑EU equations
A structured test-suite (TC01–TC28) covering flat and varying ground, barriers, buildings, long‑distance propagation and combinations of effects; each test case includes intermediate and final reference results for validation.
Quality assurance guidance for software developers: documentation identification, agreed interpretations of ambiguous clauses, and a sample declaration of conformity to support compliance claims.
Normative references include ISO 17534‑1, ISO/TR 17534‑2, and the COMMISSION DIRECTIVE (EU) 2015/996 (CNOSSOS‑EU:2015).

Applications and who should use it

Acoustic software developers implementing outdoor sound propagation modules to ensure CNOSSOS‑EU compliance and interoperable outputs.
Environmental consultants and noise modelers validating software and interpreting propagation results for strategic noise mapping.
Regulatory bodies, local authorities and project auditors who need verifiable conformity checks for noise‑mapping tools under EU directives.
QA engineers and test laboratories using the provided test cases and reference solutions to perform independent validation and regression testing.

Related standards

ISO 17534‑1 - Quality requirements and quality assurance for outdoor sound calculation software
ISO/TR 17534‑2 - General recommendations for test cases and QA interface
COMMISSION DIRECTIVE (EU) 2015/996 - CNOSSOS‑EU:2015 (source method document)

ISO/TR 17534-4:2020 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Applications and who should use it

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Applications and who should use it

Related standards

Related standards

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