Abstract
This paper describes actual measurement on sound pressure propagation. We are studying speaker array which applies approach to hearing as a parts of robots to works on people. In order to examine the change of sound field forming by speaker array minutely, it is necessary that we measure dynamic characteristic of sound field. But, we could not measure to make sure of an effect of dynamic characteristic till now. In this study, it is the main object that we are enabled to measure the change of sound field from the dumb state to steady state in dozens of microsecond units.
