FREQUENCY AND ANGULAR RESOLUTION FOR MEASURING, PRESENTING, AND PREDICTING LOUDSPEAKER POLAR DATA

The spherical polar loudspeaker data available today are usually measu red with such a coarse resolution that only rough estimates of the per formance of sound systems can be predicted by applying these data. Com plex, spherical polar data with higher angular and frequency resolutio ns than used today are needed to represent and predict the sound field s from single and multiple sound sources more accurately. The relation ship between measurement resolution and the accuracy of presented or p redicted polar and frequency responses from single or arrayed loudspea kers is described. Plane and spherical polar data measurement principl es and systems, in terms of specific levels of accuracy, are also disc ussed. The presented material consists of research the authors have do ne for the AES Standards Committee SC-04-03, working group on loudspea ker modeling and measurement, toward a goal set by that working group anti approved by the AES Standards Committee. The work is a continuati on of AES project AES-X07 and is presented to provide background for a Call for Comment on Draft AES-5id-xxxx, AES information document for Room acoustics and sound reinforcement systems-loudspeaker modeling an d measurement-Frequency and angular resolution for measuring, presenti ng and predicting loudspeaker polar data.