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ISO 532-1-2017 pdf free download
ISO 532-1-2017 pdf free download.Acoustics — Methods for calculating loudness — Part 1: Zwicker method
Acuustique — Méthode de calcul du niveau d’isosonie — Partie 1: MEthode de Zwicker.
implementation in A.4 requires a sampling rate of 48 kHz. Signals with other sampling rates shall be resampled to 48 kllz when using this implementation. For the convenience of the user an additional source file containing an algorithm for up-sampling signals with sampling rates of 32 kHz or 44,1 kHz is provided (see 7/ BLOCK Resampling’).
For reasons of convenience, the program code is extended to allow the use of time signals in the form of WAVE files for the calculation algorithm of loudness. The data format can be 16-bit integer or 32- bit float format (correct sound pressure values, no normalized data). For a 16-bit integer format, an appropriate calibration file and the corresponding calibration value shall be given. The corresponding algorithms are also contained in the additional source file.
The type of sound field Ifree (F) or diffuse (D)J shall be specified.
The one-third-octave-band sound pressure levels are determined using one-third-octave-band filters that conform to IF.C 61260-1:2014, class I with centre frequencies spanning the range between 25 Hz and 12,5 kHz. In order to reduce uncertainties of loudness calculation the filter coefficients are provided (A2). The one-third-octave-band filters are designed as 6th order Chebyshev filters using three 2nd order sections. These filters are optimized to provide a damping of 20 dB at the centre frequencies of the adjacent bands (except for 12,5 kHz only the lower band is considered). This means that, for example, a I kHz tone with a sound pressure level of 70 dB produces the following levels at different centre frequencies: 50 dB at 800 Hz, 70 dB at 1 kllz and 50 dB at 1,25 kHz.
The method for stationary sounds also offers the use of one-third-octave-hand levels measured with a sound level meter according to IEC 61672-1:2013, class 1, and a filter according to IEC 61 260-1:2014, class 1, as input.
NOTE A software package including the listing of the program code can be freely downloaded from http://standa rdsiso.urg/iso/532/-1/ed.1/en
5 Method for stationary sounds
This specifies a method for calculating loudness and loudness level of stationary sounds using objective measurement data and a calculation procedure developed by E. Zwicker and his colleagues. 11.41 The calculated data allow the loudness to be specified and thus different stationary sounds to be quantitatively evaluated according to their individual expected perceived loudness. The procedure applies to all stationary sounds.
The method for stationary sounds given In this document is an updated version of method B as given En
ISO 532:1975, providIng a modified treatment of low-frequency energy. The calculation is based on an
algorithmic approach as opposed to a graphical method. ISO 532-1-2017 pdf free download.
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