Measuring system for directivity of loudspeaker

Abstract

A measuring system for the directivity of a loudspeaker is designed for solving technical problems that the traditional measuring method for the directivity of a loudspeaker only can be implemented for measuring the directivity in the horizontal direction and the vertical direction, the complete three-dimensional directivity of a sphere cannot be measured, and requirements of building a precise acoustic model of the loudspeaker cannot be met. A control system of the measuring system controls a sound producing system to rotate and to generate pink noise, and pink noise signals are received by a receiving system and are processed, so that three-dimensional directivity data of the loudspeaker are generated. A rotary platform for fixing the loudspeaker is arranged on the upper surface of a support frame of the sound producing system, and is used for combining rotation in the horizontal direction with rotation in the vertical direction, so that the three-dimensional directivity of the loudspeaker can be measured. Three-dimensional directivity data of loudspeakers for various purposes can be measured, and three-dimensional directivity patterns can be generated. The measuring system has the advantage that the loudspeaker can be changed at optional angles in three-dimensional space, the precise three-dimensional directivity data and directivity patterns are obtained, and the measuring system reliably guarantees building of a precise acoustic model of the loudspeaker and the accuracy of acoustic simulation.

Description

technical field [0001] The invention relates to an electroacoustic measurement system in the fields of automobiles, cinemas, concert halls and the like, in particular to a loudspeaker three-dimensional directivity measurement system. Background technique [0002] With the development of computer acoustic simulation technology, the method of realizing sound field simulation by establishing speaker acoustic model has become a reality, and at the same time, more requirements are put forward for the parameter measurement of the speaker. [0003] Directivity is used to describe the loudspeaker's ability to radiate sound power to all directions in space, and is usually represented by a curve of sound pressure level versus radiation angle. Traditional loudspeaker directivity measurement methods include directivity measurements in the horizontal direction alone and in the vertical direction alone. The directivity measurement in the horizontal direction is to fix the microphone dire...

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