The soundscape dynamics of human agglomeration

The soundscape dynamics of human agglomeration

H. V. Ribeiro, R. T. Souza, E. K. Lenzi, R. S. Mendes, L. R. Evangelista, New Journal of Physics 13, 023028 (2011). PDF | DOI

We report on a statistical analysis of the people agglomeration soundscape. Specifically, we investigate the normalized sound amplitudes and intensities that emerge from human collective meetings. Our findings support the existence of non-trivial dynamics characterized by heavy tail distributions in the sound amplitudes, long-range correlations in the sound intensity and non-exponential distributions in the return interval distributions. Additionally, motivated by the time-dependent behavior present in the volatility/variance series, we compare the observational data with those obtained from a minimalist autoregressive stochastic model, namely the generalized autoregressive conditional heteroskedastic process (the GARCH process), and find that there is good agreement.