This document specifies a method for estimating the loudness and loudness level of stationary sounds as perceived by otologically normal adult persons under specific listening conditions. It provides an algorithm for the calculation of monaural or binaural loudness for sounds recorded using a single microphone, using a head and torso simulator, or for sounds presented via earphones. The method is based on the Moore-Glasberg algorithm. This method can be applied to tones, broadband noises and complex sounds with sharp line spectral components, for example transformer hum or fan noise. The evaluation of the harmful effect of sound events is outside the scope of this document.
Tämän julkaisun valmistelusta Suomessa vastaa Metalliteollisuuden Standardisointiyhdistys ry, puh. 09 19 231 (vaihde).
Sisällysluettelo
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 General
5 Specifications of signals
5.1 General
5.2 Complex tone
5.3 Noise consisting of bands of pink or white noise of defined width
5.4 Mixture of discrete sinusoidal components and bands of pink or white noise
5.5 Sound specified in terms of the sound pressure levels in 29 adjacent one-third-octave bands
6 Instrumentation
7 Description of the method
7.1 Introduction
7.2 Determination of sound spectrum at the tympanic membrane
7.3 Determination of sound spectrum at the oval window
7.4 Transformation of sound spectrum into excitation pattern
7.5 Transformation of excitation pattern into specific loudness
8 Calculation of loudness and loudness level
8.1 Calculation of monaural and binaural loudness (diotic and dichotic stimuli)
8.2 Relationship between loudness level and loudness
8.3 Calculation of the reference threshold of hearing
9 Uncertainty of calculated loudness for stationary sounds
10 Data reporting
Annex A Comments regarding binaural loudness (informative)
Annex B Results for specific test signals (informative)
Annex C Software for the calculation of loudness (informative)
IEC/TS 60318-7 Electroacoustics — Simulators of human head and ear — Part 7: Head and torso simulator for the measurement of hearing aids
IEC 61260-1:2014 Electroacoustics — Octave-band and fractional-octave-band filters — Part 1: Specifications
IEC 61672-1:2013 Electroacoustics — Sound level meters — Part 1: Specifications
IEC/TS 60318-7 Electroacoustics — Simulators of human head and ear — Part 7: Head and torso simulator for the measurement of hearing aids
IEC 61260-1:2014 Electroacoustics — Octave-band and fractional-octave-band filters — Part 1: Specifications
IEC 61672-1:2013 Electroacoustics — Sound level meters — Part 1: Specifications