Study on programmable gain in ultrasonic guidance system for the blind
- VernacularTitle:超声波导盲系统中可编程增益的研究
- Author:
Xiang YAO
;
Yongchun SU
;
Wei YU
;
Qinkai DENG
- Publication Type:Journal Article
- Keywords:
programmable gain;
digital potentiometer;
ultrasonic sensor;
echolocation;
time of flight;
the blind
- From:
Chinese Medical Equipment Journal
1993;0(06):-
- CountryChina
- Language:Chinese
-
Abstract:
Ultrasonic sensors are optimal to the guidance system for the blind.The previous ultrasonic guidance systems acquire the position information of obstacles,and transform it into audio signal or tactile vibration.The system developed in this paper,utilizing programmable gain technique and digital potentiometer,acquires the power of reflected ultrasonic as additional information,and informs the blind with modulated audio signal.In this paper,the studies on programmable gain is described detailed including the hardware structure,the software design and information post processing.
