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The sound intensity measurement can be applied to different problems of practical acoustics.The enployment of a two-channel technique makes it possible to obtain information about a sound field, the reactivity of the sound'field being of particular importance.In a given point of the sound field and a given direction of measurement, the reactivity of the sound field is defined as a ratio between sound pressure and sound intensity or as a difference bet een sound pressure level and sound intensity level.The difference of these levels contains three important pieces of information: about the sound source, the environment
J BELZA (Fri,) studied this question.