Design of a Sonar System for Visually Impaired Humans
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Constraints and features useful for an effective and easy to learn human sonar device are described. These include matching spatial cues generated by the device to those in the world. Techniques used by natural echolocators, including specifications of signal type, emitter, and receiver are briefly reviewed, as is techniques of converting ultrasonic signals to the audible range and techniques for externalizing sounds. Finally, a prototype sonar system designed while considering these ideas is described.