基于虚拟声场的智能音频设备声音接收指向性测量方法探究

To measure the sound reception directivity of intelligent audio devices and reduce the cost and complexity of the measurement system，the vector-based amplitude panning（VBAP）method is explored to form a virtual sound field simulating the physical sound field environment. The differences between the radiation sound field of the virtual and the actual sound source are verified by simulation，and the main factors affecting the differences of the sound field are analyzed. On this basis，the planar sound imager is used to locate the virtual sound source and capture its images. The pixel analysis of the images is carried out to obtain the position error between the experimental and the ideal sound source，and the uncertainty of the experimental data is evaluated. The experimental results indicate that for a dual-loudspeaker system with an angle of 45°，the virtual sound source significantly deviates from the preset position when the frequency is above 2.5 kHz. When the angle of the dual-loudspeaker system is 22.5° ，the maximum localization error of the sound imager for the virtual sound source within approximately 1° in 500 Hz-2.0 kHz. For the virtual sound source with 2.6 kHz，the maximum localization error can be controlled around 2.5° . Once the frequency exceeds 3.0 kHz，the maximum localization error of the virtual sound source will be greater than 3°，significantly deviating from the desired position. When the frequency reaches 4.0 kHz，it is difficult for the acoustic imager to locate the virtual sound source.