AS 3657.2-1996

1 - AS 3657.2-1996 ACOUSTICS-EXPRESSION OF THE SUBJECTIVE MAGNITUDE OF SOUND OR NOISE - METHOD FOR CALCULATING LOUDNESS LEVEL
4 - PREFACE
5 - CONTENTS
7 - 0 INTRODUCTION
8 - SECTION ONE METHOD A FOR CALCULATING THE LOUDNESS OF A COMPLEX SOUND THAT HAS BEEN ANALYSED IN TERMS OF OCTAVE BANDS
8 - 1 GENERAL
8 - 2 SCOPE AND FIELD OF APPLI CATION
8 - 2.1 Diffuse sound field
8 - 2.2 Kind of spectrum
8 - 2.3 Steady state
8 - 3 DEFINITIONS
8 - 3.1 sound pressure level
8 - 3.2 band pressure level
9 - 3.3 loudness (S) in sones
9 - 3.4 loudness-loudness level relation
9 - 3.5 loudness index:
9 - 4 SPECIFICATION
9 - 4.1 Calculated loudness
9 - 4.2 Calculated loudness level
9 - 4.3 Table of loudness index
12 - SECTION TWO METHOD B FOR CALCULATING THE LOUDNESS OF A COMPLEX SOUND THAT HAS BEEN ANALYSED IN TERMS OF ONE-THIRD OCTAVE BAND
12 - 5 GENERAL
12 - 6 SCOPE AND FIELD OF APPLI CATION
12 - 6.1 Frontal sound
12 - 6.2 Diffuse field
12 - 7 DEFINITI ONS
12 - 7.1 band pressure level
12 - 7.2 critical bands
13 - 7.3 calculated loudness level:
13 - 8 SPECIFICATION
13 - Step 1
13 - Step 2
13 - Step 3
24 - ANNEX A - BIBLIOGRAPHIC REFERENCES (Method A)
24 - ANNEX B - BIBLIOGRAPHICAL REFERENCES (Method B)

Specifies two methods for calculating the loudness level of a complex sound in terms of a single number calculated from a spectrum analysis. Method A utilizes physical measurements obtained from spectrum analysis in terms of octave bands. Method B utilizes spectrum analysis in terms of one-third octave bands. This Standard is identical with and has been reproduced from ISO 532:1975.

First published as AS 3657.2-1996.