ISO 3382-2:2008 PDF

Acoustics — Measurement of room acoustic parameters — Part 2: Reverberation time in ordinary rooms

Open preview (PDF)

Title (English):

ISO 3382-2:2008

Acoustics — Measurement of room acoustic parameters — Part 2: Reverberation time in ordinary rooms

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 17
Publication date:: June 12, 2008
Edition:: ISO IS 3382 edition 1 version 1
ICS:: 91.120.20

Delivery type:

Full version25 €Read online 24h10 €Read online 72h15 €

Document language:

enru

Delivery time:Immediate download

Price:25 €

Description (English):

ISO 3382-2:2008 specifies methods for the measurement of reverberation time in ordinary rooms. It describes the measurement procedure, the apparatus needed, the required number of measurement positions, and the method for evaluating the data and presenting the test report. The measurement results can be used for correction of other acoustic measurements, e.g. sound pressure level from sound sources or measurements of sound insulation, and for comparison with requirements for reverberation time in rooms.

Technical details

Technical committee: ISO/TC 43/SC 2 - Building acoustics
SKU: ISO 3382-2:2008

Abstract

Overview

ISO 3382-2:2008 - "Acoustics - Measurement of room acoustic parameters - Part 2: Reverberation time in ordinary rooms" specifies standardized methods to measure reverberation time (RT) in ordinary indoor spaces. The standard defines measurement procedures, required apparatus, measurement-position rules, evaluation of decay curves, uncertainty categories, and the required content of a test report. Results are used both to assess room acoustic quality and to provide correction terms for other acoustic measurements (e.g., sound pressure level, sound insulation, sound power).

Key topics and technical requirements

Measurement methods:
- Interrupted noise method (direct recording of the decay after noise cutoff).
- Integrated impulse response method (reverse-time integration of squared impulse responses).
Measurement accuracy levels: survey, engineering, and precision - differing mainly by the number of measurement positions and resulting uncertainty.
Evaluation ranges: 20 dB and 30 dB ranges are defined; 20 dB is preferred for practical field work (better SNR, relates to early decay).
Equipment and filters:
- Omnidirectional sound source recommended; for precision work source directivity must meet ISO 3382-1 requirements.
- Omnidirectional microphones (preferably ≤14 mm diaphragm; up to 27 mm allowed with appropriate response correction).
- Octave or 1/3-octave filters conforming to IEC 61260.
Signal processing and averaging:
- Exponential averaging time ≲ T/30; linear averaging interval ≲ T/12.
- Sampling interval between decay points

Related standards

Mentioned in the description and other ISO standards

Overview

Key topics and technical requirements

Measurement methods:
- Interrupted noise method (direct recording of the decay after noise cutoff).
- Integrated impulse response method (reverse-time integration of squared impulse responses).
Measurement accuracy levels: survey, engineering, and precision - differing mainly by the number of measurement positions and resulting uncertainty.
Evaluation ranges: 20 dB and 30 dB ranges are defined; 20 dB is preferred for practical field work (better SNR, relates to early decay).
Equipment and filters:
- Omnidirectional sound source recommended; for precision work source directivity must meet ISO 3382-1 requirements.
- Omnidirectional microphones (preferably ≤14 mm diaphragm; up to 27 mm allowed with appropriate response correction).
- Octave or 1/3-octave filters conforming to IEC 61260.
Signal processing and averaging:
- Exponential averaging time ≲ T/30; linear averaging interval ≲ T/12.
- Sampling interval between decay points

ISO 3382-2:2008 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Related standards

Abstract

Overview

Key topics and technical requirements

Related standards

Acoustics - Measurement of room acoustic parameters - Part 1: Performance spaces (ISO 3382-1:2009)

Electroacoustics - Octave-band and fractional-octave-band filters - Part 1: Specifications

Systems and software engineering — Software life cycle processes

Asset management — Vocabulary, overview and principles

Asset management — Asset management system — Requirements

Information technology — Radio frequency identification device conformance test methods — Part 2: Test method…

Information technology — Multimedia framework (MPEG-21) — Part 22: User Description

Milk — Determination of the lactoperoxidase activity — Photometric method (Reference method)