What is ISO 26101-1- Test methods for the qualification of the acoustic environment about?
ISO 26101-1 specifies the methodology for qualifying acoustic spaces as anechoic and Hemi-anechoic spaces meeting the requirements of a free sound field.
ISO 26101-1 also specifies discrete-frequency and broad-band test methods for quantifying the performance of anechoic and Hemi-anechoic spaces defines the qualification procedure for an omnidirectional sound source suitable for free-field qualification, gives details of how to present the results, and describes uncertainties of measurement.
ISO 26101-1 has been developed for qualifying anechoic and Hemi-anechoic spaces for a variety of acoustical measurement purposes. It is expected that, over time, various standards and test codes will refer to ISO 26101-1 to qualify an anechoic or Hemi-anechoic space for a particular measurement. ISO 26101-1 describes the divergence loss method for measuring the free sound field performance of an acoustic environment.
Who is ISO 26101-1- Test methods for the qualification of the acoustic environment for?
ISO 26101-1 on test methods for the qualification of the acoustic environment is beneficial for:
- Acousticians
- Acoustical engineers
- Agencies of acoustic environment testing
- People qualifying for free-field environments
Why should you use ISO 26101-1- Test methods for the qualification of the acoustic environment?
ISO 26101-1 describes the divergence loss method of measurement of performance of an environment designed to provide a free sound field or free sound field over a reflecting plane. An acoustical environment is a free sound field if it has bounding surfaces that absorb all sound energies incident upon them. This is normally achieved using specialized test environments, such as anechoic or Hemi-anechoic chambers. In practice, these provide a controlled free sound field for acoustical measurements in a confined space within the facility.
The purpose of ISO 26101-1 is to promote uniformity in the method and conditions of measurement when qualifying free sound field environments.
Overall, ISO 26101-1 is helpful as it provides details on the test methods for the qualification of the acoustic environment which can be beneficial for your business. The free sound field performance is evaluated by quantifying the contributions of both the direct and the reflected components of acoustic energy.
What’s changed since the last update?
BS ISO 26101-1:2021 cancels and replaces the second edition of ISO 26101:2017, of which it constitutes a minor revision. The changes compared to the previous edition are as follows:
The title of the document was changed from “Acoustics — Test methods for the qualification of free-field environments” to “Acoustics — Test methods for the qualification of the acoustic environment — Part 1: Qualification of free-field environments”, so that an additional part, "ISO 26101-2, Acoustics — Test methods for the qualification of the acoustic environment —Part 2: Determination of the environmental correction", can be introduced.