DANSK DSF/ISO/DIS 532-1 PDF

This part of ISO 532 specifies a method for estimating the loudness and loudness level of stationary sounds as perceived by otologically normal adult listeners under specific listening conditions. The document 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. NOTE 1 Problems of binaural calculations are discussed in Annex A. The method is based on the Moore-Glasberg algorithm and starts by converting a specified signal spectrum into a series of sinusoidal components representing that spectrum. This series is then transformed into a specific loudness pattern by applying four consecutive transformations, each of which is directly related to physiological and psychological characteristics of the human hearing system. Loudness is calculated from the specific loudness pattern. NOTE 2 Users who do not wish to understand the details of the calculation method can still apply the standard by using an executable computer program which is entirely informative and provided with the standard for the convenience of the user. This method can be applied to tones, broadband noises, and to complex sounds with sharp line spectral components, e.g., transformer hum or fan noise. It has been shown that this method provides a good match to the contours of equal loudness level as defined in ISO 226:2003 [1] and the reference threshold of hearing as defined in ISO 389-7 [2].