Yoshiharu Soeta, Ryota Shimokura, Jin Yong Jeon and Pyoung Jik Lee
International Journal of Railway, vol. 6, no. 3, pp.120-124, 2013

Abstract : The aim of this study was to clarify the characteristics of interior noise in Japanese, Korean, and Chinese subways. The octave-band noise levels, A-weighted equivalent continuous sound pressure level (LAeq) and parameters extracted from interaural cross-correlation/autocorrelation functions (ACF/IACFs) were analyzed to evaluate the noise inside running train cars quantitatively and qualitatively. The average LAeq was 72-83 dBA. The IACF/ACF parameters of the noise showed variations in their values, suggesting they are affected by the characteristics of the trains running, wheel-rail interaction, and cross-section of the tunnels.

Keyword : Train noise in a car, Interaural cross-correlation function, Autocorrelation function, Pitch