Boys J T, Strelow E R, Clark G R
Ultrasonics. 1979 Jan;17(1):37-42. doi: 10.1016/0041-624x(79)90010-6.
An experimental ultrasonic sonar for use as a sensory aid with blind children is described. Novel signal processing techniques make the aid relatively simple to construct, yet allow many of its parameters to be changed in the field. In particular, the aid has two features, a variable range code and an automatic level control, which make the device very versatile in a wide variety of environments. The ultrasonic tranducers used in the aid are described in some detail.
本文描述了一种用作盲童感官辅助工具的实验性超声波声纳。新颖的信号处理技术使该辅助工具相对易于构建，但又允许其许多参数在现场进行更改。特别是，该辅助工具具有两个特点，可变距离编码和自动电平控制，这使得该设备在各种环境中都非常通用。文中还详细描述了该辅助工具中使用的超声换能器。
