GB/T 25079-2010Acoustics -- Application of new measurement methods in building and room acoustics -- MLS and SS methods (English PDF)

Foreword

This standard is identical with ISO 18233:2006 "Acoustics Building acoustics and room acoustics in the new measurement methods in use MLS and SS Method "(in English).

This standard is equivalent to using international standards were editorial changes.

The Standard Annexes A and B are normative appendix.

This standard was proposed by the Chinese Academy of Sciences.

This standard by the National Standardization Technical Committee of Acoustics (SAC/TC17) centralized.

This standard was drafted. Institute of Acoustics, Chinese Academy of Building Research.

Introduction

Analytical methods used to measure the random signal from the sound propagation phenomenon began to develop in 1960, but due to lack of effective initially calculated to Force, these methods can only be applied to well-equipped laboratories.

With digital circuits, the development of a powerful general-purpose computer, and digital signal processing components in the field of acoustic measurement applications, Based on such measuring instruments expanded digital signal processing applications matures. Currently, special equipment and can be transported on a general purpose computer Line professional software already adopted these measurements, and has been applied widely.

Compared with traditional methods, the new method has many advantages, for example. suppress background noise and extended measuring range. But if you do not comply with certain Guidelines, it may not be reliable results. At the same time, compared with the traditional method, the new method may be time-varying and changing environmental conditions more sensitive.

This standard is intended for the construction of new acoustics and room acoustics measurement methods given in the relevant requirements and guidelines, and the requirements and guidelines can be Measuring device suitable for the application of these methods.

Even the traditional methods and measuring equipment and experienced people may not realize that some applications of the new method of difficulties and limitations, each user should be encouraged on the basis of new theoretical method we have a deeper understanding of, and should be encouraged to give equipment manufacturers More guide device applications, and the measured results unreliable timely warning is given as a design target Equipment.

This standard gives the requirements for sound insulation in buildings and building components measured reverberation time and related physical quantity measuring methods applied in new and guidelines Then, references are given about the content of the measurement, standards and the number of points the traditional method of selecting the location and the measurement conditions.

Acoustics in building acoustics and room acoustics MLS and SS application methods of new measurement methods

1 Scope

This standard specifies the application guide measuring the acoustic characteristics of the building and of building elements of the new approach and requirements, but also gives the excitation signal Selection, signal processing and environmental control guidelines and requirements, as well as linear and invariant aspects of the system under test when requested.

This standard applies to the following measurements, such as airborne sound insulation between rooms and the amount of the external walls of the room reverberation time and other room acoustical parameters Measurement, reverberation chamber sound absorption, vibration and differential loss measurements factors.

The method defined in this standard may be used instead, such as GB/T 19889 (all parts), ISO 3382 (all parts) and GB/T 21228.1 Traditional methods defined.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.

GB/T 3241 octave and fractional octave filters (eqv IEC 61260:1995, GB/T 3241-1998) Electric, acoustic performance and test methods GB/T 3785 sound level meter (IEC 61672-1, NEQ)

3 Terms, Definitions and Acronyms