Parametric array bionic signal acoustic ultrasound guidance system for the blind

Abstract

The invention discloses a parametric array bionic signal acoustic guidance system for the blind, and the system comprises the following steps: 1) an instruction is transmitted to an transmitting control unit through a handheld control device; 2) the transmitting control unit receives an instruction of the handheld control device to drive a parametric array transmitting unit to continuously transmit bionic acoustic signals; and 3) echo signals are generated by the bionic acoustic signals (simulating a detection signal waveform transmitted by a dolphin during cruising) passing through an object.According to the invention, there is no ultrasound receiving and processing unit, the transmitting unit transmits continuous acoustic waves and acoustic beams with high directivity through acoustic parametric array technology, thus an effect similar to an "acoustic flashlight" is formed, a user can only hear reflected acoustic waves of an object irradiated by the "acoustic flashlight", the auditory pathway of a human brain is a real signal processor, and by analyzing intensity, direction and tonality features of the echo signals, the distance, the size, the shape, the material and other information of the "irradiated" object are judged.

Description

Technical field [0001] The present invention relates to the field of acoustic implantation technology, and more particularly to a para-active signal acoustic blind system. Background technique [0002] Because the blind and severe amblyopia population cannot obtain the surrounding environment information through visual acquisition, the surrounding environment can only be well known. The traditional guide method is to judge whether there is an obstacle around whether the touch of the blind stick is touched and tapped according to the guide rod and its echo. With the advancement of technology, a guide device for applying optical photographing and incorporating image identification techniques has emerged. [0003] As early as the 1970s, New Zealand scholar leslie kay gave the design of the ultrasound guide, and he adjusted the distance between the detection obstacles into different frequencies, suggesting the distance and size of the obstacles in front of the blind. Xu Zhenxia, ​​Ea...

AI Technical Summary

Problems solved by technology

[0004] The above ultrasonic blind guide designs all adopt short-pulse ultrasonic signals to measure the obstacle distance according to the time difference between the echo pulse sound signal and the transmitted pulse sound signal (the principle is similar to the car reversing radar), and the traditional horn cannot achieve ultra-high directional emission. If the sound waves are emitted continuously, the user will not be able to hear the echo signals of the objects clearly because the direct sound waves from the speaker to the ears are too large, and the echo signals of the surrounding objects in all directions reach the ears at the same time, and it is difficult for the auditory system to distinguish the echoes of each object

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