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ANSI S3.4-2005

American National Standard Procedure for the Computation of Loudness of Steady Sound

This standard specifies a procedure for calculating the loudness of steady sounds as perceived by listeners with normal hearing. The procedure is based on the spectra of the sounds. The possible sounds include simple and complex tones (both harmonic and inharmonic) and bands of noise. The standard is applicable to sounds presented in free field with frontal incidence, in a diffuse field, or via headphones. A computer program, which performs the computation and provides a loudness estimate in sones, and the corresponding loudness level in phons, is provided. Use of this software is not required for conformance.


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Acoustical Society of America [ASA]


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As the voice of the U.S. standards and conformity assessment system, the American National Standards Institute (ANSI) empowers its members and constituents to strengthen the U.S. marketplace position in the global economy while helping to assure the safety and health of consumers and the protection of the environment.

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