Ultrasonic tactile feedback system and method for assisting blind person to perceive

A tactile feedback, ultrasonic technology, applied in the input/output process of data processing, the input/output of user/computer interaction, instruments, etc., can solve the problems of delay, system time and spatial resolution, and achieve small sequence Bias, low latency, high resolution effects

Active Publication Date: 2019-11-29
XI AN JIAOTONG UNIV
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Problems solved by technology

However, there is a delay problem in the existing vision-based finger motio

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  • Ultrasonic tactile feedback system and method for assisting blind person to perceive
  • Ultrasonic tactile feedback system and method for assisting blind person to perceive
  • Ultrasonic tactile feedback system and method for assisting blind person to perceive

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Embodiment Construction

[0069] In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

[0070] see figure 1 with figure 2 , the present invention provides an ultrasonic tactile feedback system for assisting the perception of the blind, including a PC terminal 1, a microcontroller 2, an FPGA controller 3, a polyhedral three-dimensional ultrasonic phased array 4 in the air, a drive circuit and a hand motion capture sen...

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Abstract

The invention discloses an ultrasonic tactile feedback system and method for assisting a blind person to perceive. The ultrasonic tactile feedback system comprises a PC terminal for generating a focustime sequence; a microcontroller which stores focus information; an FPGA controller which completes conversion of the focus under different unit coordinate systems; an ultrasonic phased array which controls sound pressure distribution in a cavity surrounded by the ultrasonic phased array, and a plurality of tactile points or three-dimensional patterns are formed in space under the action of driving signals on each unit ultrasonic transducer, so that static and freely touchable aerial virtual braille points are realized; the transmitted and modulated ultrasonic waves at the focal point in a phase delay mode are focused according to the focal point coordinates, so that a person obtains tactile perception to indicate that the current gesture task is smoothly completed; and when the hand position capture sensor captures the identification position information, the PC terminal sends the next group of control signals to finish the real-time update and display of the information. Static braille information can be formed in space and can be quickly changed and switched in real time, and the blind can touch and sense the braille information in a non-contact mode.

Description

technical field [0001] The invention belongs to the technical field of spatial volume imaging, and in particular relates to an ultrasonic tactile feedback system and a method thereof for assisting perception of blind people. Background technique [0002] Blind people need to experience a more three-dimensional and richer world than their daily life. Through touch, they can feel everything in the world, such as animals, plants, celestial bodies, and buildings. A general touch exhibition requires a large number of various exhibits. Daily learning by touch is also through flat two-dimensional touch images, or special three-dimensional model perception. Currently, to aid touch perception for the blind, a team from Orbital Research and the American Printing Institute for the Blind has developed an electronic touchscreen that contains 2,400 equally spaced pins that can be adjusted to different heights. Variable height pins can depict geometric figures, pie charts, bar charts, a...

Claims

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Application Information

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IPC IPC(8): G06F3/01
CPCG06F3/016G06F3/017
Inventor 李晓玲赖嘉芮郑子明贾维维田全文张丽霞
Owner XI AN JIAOTONG UNIV
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