This paper discusses the practical aspects of data acquisition and signal processing techniques involved while developing an impedance tube. Microphones, data acquisition systems, set of speakers were carefully selected, calibrated, and assembled as one unit. The raw time signal is acquired through a Virtual Instrument (VI) developed in LabVIEW, and the mathematical equations involved in the process are implemented in MATLAB R 2017a. Important considerations involved in these processes have been thoroughly discussed in the paper. The final results contained outliers that were removed by the application of digital filters. The results obtained from the application of different types of digital filters are shown, discussed, and the best combination of filters has been selected. This combination results in a robust and efficient method with an improved low-frequency response (< 250 Hz) which, in a standard commercial impedance tube, was achieved by altering the microphone spacing. The validation was performed by conducting experiments on a blank tube, melamine foam, glass wool, and comparison were made with the result obtained on the set-up of a leading manufacturer, and with the ones reported in works of literature. They show a good match between them which completes the validation.

本文讨论了开发阻抗管时涉及的数据采集和信号处理技术的实际方面。麦克风，数据采集系统和一组扬声器经过精心选择，校准和组装为一个单元。原始时间信号通过LabVIEW中开发的虚拟仪器（VI）采集，该过程中涉及的数学方程式在MATLAB R 2017a中实现。这些过程中涉及的重要考虑因素已在本文中进行了全面讨论。最终结果包含异常值，这些异常值已通过应用数字滤波器消除。展示，讨论了通过使用不同类型的数字滤波器而获得的结果，并选择了滤波器的最佳组合。这种组合产生了一种鲁棒而有效的方法，具有改进的低频响应（<250 Hz），在标准的商用阻抗管中，是通过改变麦克风的间距来实现的。验证是通过在空白管，三聚氰胺泡沫塑料，玻璃棉上进行实验来进行的，并与领先制造商的设置和文献报道的结果进行了比较。它们之间显示出良好的匹配，从而完成了验证。以及在文学作品中报道的那些。它们之间显示出良好的匹配，从而完成了验证。以及在文学作品中报道的那些。它们之间显示出良好的匹配，从而完成了验证。