abstract
- © 2017 IEEE. Obstacle detection for the use of blind and visually impaired people has been an area with a low development nowadays. Imaging technologies require large equipment and specialized software made up of complex algorithms that have not been fully tuned for everyday use. Ultrasound allows some bats to echolocate by determining the time-of-flying of the signals and their frequency domain processing. In this work, we propose a system for the generation, emission and reception of ultrasonic pulses in air, which will be used in the detection of obstacles with ultrasound. The system consists of an amplifier, two transducers and an active filtering system. The time-of-flying of the ultrasound signals will provide the distance between the emitter and the object, while the time/frequency information will permit to determine the size, composition and shape of the object. This paper is a first approximation of the whole system with some evidence in shape and composition determination with a simple analysis in the frequency domain.