Abstract Floor impact noises generated by bang and tapping machines were measured through dual microphones on the ear of a human head. Matching and magnitude estimation techniques for noise evaluation were used to investigate the perceptual differences of the impact noises from apartment floors. Measurements of noise were also conducted by a diagnostic system based on the model of the human auditory–brain system [1]. Physical factors in the model were calculated by the use of the auto-correlation function (ACF) and interaural cross-correlation function (IACF) of binaural signals. From the results, it was found that perceived loudness of floor impact noise could be represented by the ACF/IACF factors. It became apparent that, at the beginning of each impact of intermittent noise (“bang noise”), the spatial impression of the sound field in an apartment bedroom corresponds to a high value of the IACC. Results also show that bang machine noise is perceived to be louder and noisier than that of a tapping machine.
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