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The way speakers interact with their acoustic environment is highly dependent on directionality and directly affects the listening experience. From the perspective of speaker designers, there are countless options to make speakers directional or omnidirectional, from speaker materials, system design, to active control using digital signal processing. However, conducting accurate acoustic measurements in three-dimensional space remains a challenge. Traditional measurement techniques require far-field directional testing in a free field, which requires a fully anechoic or semi anechoic chamber with controllable indoor temperature and humidity, and a boundary covered with sound-absorbing materials. By utilizing Klippel's polar far-field measurement (POL) module, the measured sound source can be automatically controlled φ and θ Rotate the shaft and measure its sound pressure frequency response. There are different hardware setting methods. One is one-dimensional polar coordinate measurement using only one turntable: the measurement data can be processed through visualization software to obtain results such as sound power, directivity index, contour plot, and polar plot. Another testing setup is to use two turntables for two-dimensional polar coordinate measurement, which can obtain an additional 3D radiation characteristic balloon plot. Another alternative to rotating turntables is to use a microphone array, and the hardware settings are as follows: These traditional far-field measurement methods have many drawbacks: the anechoic chamber wastes space, costs money, and is not mobile. Imagine how to take away the anechoic chamber if you want to relocate? Low frequency sound absorption is insufficient, and the response data measured below 100Hz is often unreliable. For large speaker systems, the first condition to meet the far field requirement is that the testing distance should be greater than the size of the speaker system. The changes in temperature and humidity along the propagation path will affect the phase response, resulting in inaccurate directionality. For example, when testing at a distance of 5m, a temperature deviation of 2 ℃ produces a phase error of 90 ° at 5kHz. To obtain 3D data, it is necessary to rotate the DUT on multiple axes. For heavy-duty DUTs, it is often impractical to obtain data with a resolution of 1 °, usually higher than 2 °, and it is necessary to assume that one or two planes are symmetrical to reduce measurement time. Only far-field data is available, and near-field sound is not accurate. Near-field sound is important for evaluating portable devices and monitoring audio applications today. Author: Summer Saturday https://www.bilibili.com/read/cv15551347/ Source: Bilibili

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