Blind guiding device and blind guiding method based on dual-frequency ultrasonic waves

A technology of ultrasonic waves and transmitting transducers, which is applied in the direction of appliances that help people walk, physical therapy, etc., and can solve problems such as the inability to predict the movement state of moving obstacles, waste of battery power, and shortened battery life.

Pending Publication Date: 2017-04-26
TAISHAN MEDICAL UNIV
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  • Abstract
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Problems solved by technology

However, the problem with this device is that the blind guide equipment can only measure the distance between the user (blind person) and the obstacle, but cannot predict the movement state of the moving obstacle.
However, the problem with this device is that in order to achi

Method used

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  • Blind guiding device and blind guiding method based on dual-frequency ultrasonic waves
  • Blind guiding device and blind guiding method based on dual-frequency ultrasonic waves
  • Blind guiding device and blind guiding method based on dual-frequency ultrasonic waves

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Embodiment

[0043] In the current field of ultrasonic guided blind detection, the distance detection technology for obstacles is widely used, but the detection of its motion state is less, and in fact it is very important for blind people to know the motion state of obstacles in time. Therefore, a car with a moving speed of 30km / h is used as an obstacle, and the blind guide device based on dual-frequency ultrasonic waves of the present invention is used for detection.

[0044] The main control circuit mainly analyzes the frequency of the signal received by the second ultrasonic receiving transducer 8, and calculates the speed according to the Doppler effect, and the frequency changes caused by the approach and distance of obstacles are as follows:

[0045]

[0046]

[0047] Among them, v is the detected frequency; v 0 It is the moving speed of the blind person. Since the blind person walks slowly, it can be zero or other small values ​​by default; v s is the velocity of the ultraso...

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Abstract

The invention relates to a blind guiding device and a blind guiding method based on dual-frequency ultrasonic waves. The blind guiding device structurally comprises a control handle, a control press key, a main circuit board, a first ultrasonic wave emitting energy transducer, a second ultrasonic wave emitting energy transducer, a first ultrasonic wave receiving energy transducer and a second ultrasonic wave receiving energy transducer; the control handle is mainly provided with a storage battery; and a main control circuit is arranged inside the main circuit box, and can be used for resolving ultrasonic wave signals with the corresponding frequency received by the first ultrasonic wave receiving energy transducer and the second ultrasonic wave receiving energy transducer and controlling a warning device to send out the warning alarm according to the resolving result so as to tell the distance and the moving state of obstacles to a blind person. The blind guiding method provided by the invention can be used for helping the blind person to judge the moving state of the obstacles in advance on the basis of detecting the distance of the obstacles, and has the advantages that the precision is high; the operation is simple; and the electricity is saved, and the like.

Description

technical field [0001] The invention relates to a blind-guiding device and a blind-guiding method based on dual-frequency ultrasonic waves. Background technique [0002] According to the statistics of the national authoritative department, as of August 8, 2006, China is the country with the largest number of blind people in the world, with about 5 million people, accounting for 18% of the world's blind population. At the same time, there are 450,000 new blind people in my country every year. Experts pointed out that if the current development trend remains unchanged, the number of blind people in China is expected to increase by 4 times by 2020. Compared with able-bodied people, there are many inconveniences in the lives of blind people, the most prominent being walking. When the blind walk alone, they mainly rely on guide devices and guide dogs, but guide dogs are not easy to train and cost more. Many cities have set up sidewalks for the blind, but in many cases, the blin...

Claims

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Application Information

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IPC IPC(8): A61H3/06
CPCA61H3/061A61H2201/0157A61H2201/0184
Inventor 赵传华赵凌宇何志勇王世刚
Owner TAISHAN MEDICAL UNIV
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