A Study of Intelligent Walking Guide by Focused Parametric Array

研究了一种利用聚焦参量阵声束的盲人步行引导系统。利用聚焦参量阵在空气中传播的过程中发出可听声，形成窄可听声束，首先考虑了声束形成的最佳条件，并对声束的制导灵敏度进行了评估。研究发现，对于引导行走来说，大约20 cm的宽度是必要的，而传统的扬声器需要50-8 cm的宽度来引导人行走。同时也证实了该系统能够通过超声波的反射信号来检测被引导人的位置，这意味着该系统能够很好地智能引导人。

A walking guide system for the blind using sound beam made by focused parametric array was researched. The narrow audible sound beam was made by focused parametric array which emit audible sound in the course of propagation in air.At first, The optimum condition for making sound beam was considered and the sensitivity of guidance by the beam was evaluated. About 20cm width was found to be necessary for guided walk, meanwhile a conventional speaker needs 50-8-cm width for guided person to walk. A capability of detecting guided person's position by reflection signal of ultrasonic wave was in the course was also confirmed and it mean that this system can guide person very intelligently.