ASA S3 4-2007 AMERICAN NATIONAL STANDARD Procedure for the Computation of Loudness of Steady Sounds《IHS ASA订阅顾客稳定噪声计算程序及联系HIS Retail (1-800-854-7179)要求其它附件赠送本》.pdf
《ASA S3 4-2007 AMERICAN NATIONAL STANDARD Procedure for the Computation of Loudness of Steady Sounds《IHS ASA订阅顾客稳定噪声计算程序及联系HIS Retail (1-800-854-7179)要求其它附件赠送本》.pdf》由会员分享,可在线阅读,更多相关《ASA S3 4-2007 AMERICAN NATIONAL STANDARD Procedure for the Computation of Loudness of Steady Sounds《IHS ASA订阅顾客稳定噪声计算程序及联系HIS Retail (1-800-854-7179)要求其它附件赠送本》.pdf(47页珍藏版)》请在麦多课文档分享上搜索。
1、 Access to Additional Content for ASA S3.4:2007 (Click here to view the publication) This Page is not part of the original publication This page has been added by IHS as a convenience to the user in order to provide access to additional content as authorized by the Copyright holder of this document
2、Click the link(s) below to access the content and use normal procedures for downloading or opening the files. ANSI S3.4-2007 Loudness program Information contained in the above is the property of the Copyright holder and all Notice of Disclaimer Glasberg and Moore, 2006) that was developed from a mo
3、del originally proposed by Zwicker and his co-workers (1958, 1965, 1984, 1999). Zwickers model is part of ISO 532:1975. These models have their roots in the pioneering work of Fletcher and Munson (1933). The current procedure extends and improves the accuracy of these earlier methods. It replaces th
4、e more limited computational procedure used in the old ANSI S3.4-1980 that was based on the method proposed by S.S. Stevens (1957, 1961). Unlike the old ANSI S3.4-1980, the current standard can be applied to sounds with sharp line spectral components, e.g., transformer hum or fan noise, as well as t
5、o sounds with broadband spectra. Provided the measurement of sound pressure levels is sufficiently precise, and subject to certain restrictions specified below, the recommended procedure may also be used to estimate loudness, or loudness level, with reasonable accuracy down to near threshold levels.
6、 Moreover, it enables the loudness of complex sounds containing spectral energy below 500 Hz to be determined. The equal-loudness contours derived from this standard are in good agreement with ISO 226:2003 (see also Suzuki and Takeshima, 2004). Because loudness is a subjective quantity, the percepti
7、on of which may vary among people, any calculated loudness value represents only an estimate of the average loudness as perceived by a group of individuals with normal hearing. The changes made in this revision are: (1) A modification to the method for calculating specific loudness from excitation f
8、or center frequencies below 500 Hz to make the standard fully compatible with the provided software and with the model of Moore et al. (1997) and with its amendment by Glasberg and Moore (2006); (2) A modification to the transfer function of the middle ear, as proposed by Glasberg and Moore (2006),
9、which allows more accurate predictions of the absolute thresholds in ISO 389-7:2005 and of the equal-loudness contours in ISO 226:2003. The software provided with this American National Standard is entirely informative and provided for the convenience of the user. Use of the provided software is not
10、 required for conformance with the Standard. ASA and the owners of the copyright to the software provided with this American National Standard make no other representation or warranty or condition of any kind, whether express or implied (either in fact or by operation of law) with respect to any par
11、t of the product, including, without limitation, with respect to the sufficiency, accuracy or utilization of, or any information or opinion contained or reflected in, any of the product. ASA and the owner expressly disclaim all warranties or conditions of merchantability or fitness for a particular
12、purpose. No officer, director, employee, member, agent, 2007 Acoustical Society of America. All rights reserved. iv representative or publisher of the copyright holder is authorized to make any modification, extension, or addition to this limited warranty. At the time this Standard was submitted to
13、Accredited Standards Committee S3, Bioacoustics for approval, the membership was as follows: C.A. Champlin, Chair R.F. Burkard, Vice-Chair S.B. Blaeser, Secretary Acoustical Society of America . C.A. Champlin R.F. Burkard (Alt.) American Academy of Audiology .Y. Szymko-Bennett D.A. Fabry (Alt.) Amer
14、ican Academy of Otolaryngology, Head and Neck Surgery, Inc. . .R.A. Dobie . L.A. Michael (Alt.) American Industrial Hygiene Association T.K. Madison . D. Driscoll (Alt.) American-Speech-Language-Hearing Association (ASHA) L.A. Wilber V. Gladstone (Alt.) Beltone/GN Resound S. Petrovic Council for Acc
15、reditation in Occupational Hearing Conservation (CAOHC) .E.H. Berger .J.A. Mann (Alt.) Etymotic Research, Inc. M.C. Killion .R. Scicluna (Alt.) Food and Drug Administration J. Kane Frye Electronics, Inc. G.J. Frye K.E. Frye (Alt.) Hearing Industries Association .T.A. Victorian .C.M. Rogin (Alt.) Nat
16、ional Hearing Conservation Association T. Schulz National Institute for Occupational Safety and Health M. Stephenson .W.J. Murphy (Alt.) National Institute of Standards and Technology V. Nedzelnitsky R. Wagner (Alt.) Quest Technologies, Inc.M. Wurm .P. Battenberg (Alt.) Starkey Laboratories D.A. Pre
17、ves . T. Burns (Alt.) 2007 Acoustical Society of America. All rights reserved. vU.S. Air Force . R. McKinley U.S. Army Aeromedical Research Lab W. Ahroon U.S. Army Construction Engineering Research LaboratoriesL. Pater .D. Delaney (Alt.) U.S. Army Human Research FAX: 631-390-0217; E-mail: asastdsaip
18、.org AMERICAN NATIONAL STANDARD ANSI S3.4-2007 2007 Acoustical Society of America. All rights reserved. 1American National Standard Procedure for the Computation of Loudness of Steady Sounds 1 Scope This standard specifies a procedure for calculating the monaural and binaural loudness experienced by
19、 listeners with normal hearing under the following conditions: 1.1. Listening conditions. The standard applies to three listening conditions: free field with a frontal incidence, diffuse field, or listening via headphones. Listening in a free field with a frontal incidence is assumed when the sound
20、source is located at least one meter directly in front of the listener and there are no space boundaries or other surfaces that affect the sound field. The free-field condition can be achieved in an anechoic chamber or in open space. Listening in a diffuse field is assumed when the sound reaches the
21、 listeners ears from all directions with essentially the same acoustic power. The sound field in a room with hard reflective walls where the sound is reflected many times before being significantly absorbed approximates a diffuse field. Listening through headphones is assumed when the sound is deliv
22、ered directly to the listeners ears through circumaural or supra-aural headphones, or insert earphones. For simplicity, the term headphones will be used hereafter to denote both headphones and earphones. NOTE 1 The equal-loudness contour for narrow-band noise in a free field differs from that in the
23、 diffuse field, but the difference measured at 1/3-octave-band center frequencies varies from -2.0 to +4.3 decibels with the mean difference equal to only 0.8 decibels. These differences do not significantly affect calculations for broadband spectra. Nevertheless, since the loudness of a sound depen
24、ds on the nature of the enclosure in which it is heard, comparative evaluations of different sources should be based on measurements all made in essentially similar enclosures or all made in a free sound field. NOTE 2 Pressure levels in a diffuse field should be measured by means of an omnidirection
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