论文标题
一种新的方法，用于获得麦克风校准的扩散场测量
A Novel Method for Obtaining Diffuse Field Measurements for Microphone Calibration
论文作者
论文摘要
我们提出了一种直接且具有成本效益的方法，以执行弥散的声场测量值，以校准麦克风阵列的幅度响应。通常，这种校准是在混响室中创建的弥漫性声场中进行的，这是一个昂贵且耗时的过程。提出了一种在未处理环境中获得弥漫性场测量的方法。首先，得出了扩散场中宽带信号的空间相关性的闭合形式表达。接下来，我们描述了一个实用程序，用于通过在麦克风位置中引入随机扰动，在存在非散动声场的情况下获得麦克风阵列的扩散场响应。将获得的实验空间相关数据与理论模型进行了比较，证实可以在相对较少的扬声器的未处理环境中获得弥漫性场测量。证明从4-8个扬声器播放的30秒测试信号足以使用所提出的方法获得扩散的场测量。然后，在两个不同的地理位置上成功校准了特征。
We propose a straightforward and cost-effective method to perform diffuse soundfield measurements for calibrating the magnitude response of a microphone array. Typically, such calibration is performed in a diffuse soundfield created in reverberation chambers, an expensive and time-consuming process. A method is proposed for obtaining diffuse field measurements in untreated environments. First, a closed-form expression for the spatial correlation of a wideband signal in a diffuse field is derived. Next, we describe a practical procedure for obtaining the diffuse field response of a microphone array in the presence of a non-diffuse soundfield by the introduction of random perturbations in the microphone location. Experimental spatial correlation data obtained is compared with the theoretical model, confirming that it is possible to obtain diffuse field measurements in untreated environments with relatively few loudspeakers. A 30 second test signal played from 4-8 loudspeakers is shown to be sufficient in obtaining a diffuse field measurement using the proposed method. An Eigenmike is then successfully calibrated at two different geographical locations.
