中文说明：在本演示中的 Windows 声卡用作数据采集装置。线性调频波形是奏出演讲者和同时被麦克风捕获。音高和渔获物之间的时间延迟表明分离的距离。使用信号处理概念 （交叉关联和希尔伯特前信封） 确定的时间延迟。图形用户界面，使操作简单。这个演示说明了基本原则 ；没有校准的距离，为精度。
English Description：
In this demo the Windows sound card is used as a data acquisition device. A chirp waveform is played out the speaker and captured by the microphone concurrently. The time delay between pitch and catch indicates separation distance. The time delay is determined using signal processing concepts (cross correlation and Hilbert pre-envelope). A graphical user interface makes operaton simple. This demo illustrates the basic principle; distances are not calibrated for accuracy.