Glossary of terms used in noise control engineering

This document defines terms which are commonly used in noise control engineering. Most of the definitions are taken without significant modification from ANSI S1.1-1994, American National Standard ACOUSTICAL TERMINOLOGY, published by the Standards Secretariat, Acoustical Society of America, 120 Wall Street, 32nd Floor, New York, New York 10005-3993, USA. The Acoustical Society of America holds the copyright on ANSI S1.1-1994. Terms in this document which are excerpted from ANSI S1.1-1994 are reproduced with permission. In those areas of noise control engineering where ANSI S 1.1-1994 is incomplete, additional definitions have been introduced from other sources. These additional definitions are identified with superscripts. Superscript 1 is ISO 2041, superscripts 2 and 3 are the NNI staff, superscript 4 is ANSI Y10, and superscript 5 is ISO-DIS 12001. The terms from ANSI S1.1-1994 have been reordered, so that each term makes use of definitions that have appeared earlier in the glossary, whenever possible. Some of the ANSI S 1.1-1994 definitions have been simplified by incorporating notes into the main definitions, and with minor editing of the sentence structure. The glossary is presented in nine sections: (1) General, (2) Periodic Quantities, (3) Waves, (4) Spectrum, (5) Pressure, Velocity, Energy and Power, (6) Levels, (7) Instruments and Devices, (8) Noise, and (9) Building Acoustics.