Because of the multitude of impulsive sounds that can occur in automobiles it would be valuable to have a method for evaluating these sounds that relates well to customer response. Loudness Calculation based on ISO 532 Method B ( Zwicker' s method) was investigated for its potential as such a method. Problems occurred in obtaining valid 1/3 octave band spectra from conventional real time analyzers for the input to the calculation routine. A conflict arises between the short averaging times needed to track the impulse and the uncertainty principle (BT product rule) for the lower frequency bands. Since Zwicker' s method is based on critical bands, a four-pass analysis procedure was devised using an external filter set for the width of a critical band. The calculation routine was modified to directly accept critical band data. Example plots of Calculated Loudness versus time are presented showing the affects of selecting long averaging times, of not obeying the uncertainty principle, and of using the four-pass analysis method with an averaging time of 1/64th of a second. It is concluded that to properly use Zwicker' s Calculated Loudness method for impulsive sounds will require an analyzer based on critical bands rather than the standard 1/3 octave bands.


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    Titel :

    Investigating Calculated Loudness ISO 532 for Evaluating Impulsive Sounds


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    Noise & Vibration Conference & Exposition ; 1991



    Erscheinungsdatum :

    01.05.1991




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch


    Schlagwörter :


    Investigating calculated loudness ISO 532 for evaluating impulsive sounds

    Fridrich,R.J. / General Motors,US | Kraftfahrwesen | 1991


    Investigating Impulsive Sounds - Beyond “Zwicker-Loudness”

    Fridrich, Richard J. | SAE Technical Papers | 1993


    Investigating impulsive sounds - beyond "Zwicker-Loudness"

    Fridrich,R.J. / General Motors,US | Kraftfahrwesen | 1993


    Calculating loudness of impulsive sounds

    Blommer,M. / Otto,N. / Wakefield,G. et al. | Kraftfahrwesen | 1995


    Calculating the Loudness of Impulsive Sounds

    Feng, Ben John / Jones, Cerita / Wakefield, Gregory et al. | SAE Technical Papers | 1995