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A computer model for calculating the speech transmission index using the direct STIPA method

Dziechciński Paweł

Vibrations in Physical Systems

2019

Vol. 30, nr 1

art. no. 2019129

Computer models currently used for the simulation of the speech transmission index (STI) calculate the STI using the statistical method or are based on numerically determined impulse response of the transmission channel. The limitation of both these computational methods is that they do not allow to take into account the nonlinear properties of the transmission channel and fluctuating background noise. This paper presents a proposition of a model based on the direct STIPA method. This model allows computer simulations of STIPA for distributed sound systems, and enables analysis to include both changes in signal dynamics and fluctuating background noise. The paper presents the idea of the model and validation of its basic elements - the generator and the analyser. The possibilities of using the model for computer simulation of outdoor public address systems were also discussed.