Ultrasonic blind guide method and portable ultrasonic blind guide device thereof
An ultrasonic and ultrasonic detection technology, which is applied in measuring devices, using sound waves/ultrasonic waves/infrasonic waves to analyze solids, and reradiation of sound waves, etc., can solve problems such as difficulty in understanding, poor perception, and confusion for users, and achieve easy understanding and learning , small amount of calculation, easy to carry
Active Publication Date: 2011-05-18
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology
However, this single-frequency ultrasonic pulse can only detect the information of the nearest object, which makes the user poorly aware of the complex environment with multiple objects. Moreover, the prompt sound and tactile vibration fed back by some products will Make users feel confused and difficult to understand
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Embodiment 1
[0068] The present invention utilizes the above-mentioned characteristics of the ultrasonic chirp signal and a special demodulation mode for echo, and realizes the function of identifying and feeding back obstacle information through hardware circuit design and software programming. The specific implementation process of this embodiment includes the following steps:
[0069] Such as figure 2 As shown, a portable ultrasonic blind guide device according to the present invention is produced, including: a transmitting transducer A, which transmits a continuous cycle of ultrasonic chirp signals, and the ultrasonic signals are reflected by obstacles to generate echo signals; receiving transducer B , to receive the echo signal; the microcontroller 1 is connected to the input end of a signal generating unit 2 for software control signal generating unit 2; the signal generating unit 2 is connected to the input end of the receiving transducer B and The output terminal of the microcont...
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Abstract
The invention relates to an ultrasonic blind guide method and a portable ultrasonic blind guide device thereof. The ultrasonic blind guide method comprises the following steps: 1) transmitting an ultrasonic detection signal with broadband linear frequency modulation to an environment by a transmission transducer, wherein the ultrasonic detection signal is spread in air and reflected by obstacles to generate an echo signal; 2) receiving the echo signal by a receiving transducer; and adjacently placing the transmission transducer and the receiving transducer which point to the same direction; 3) processing the echo signal to obtain an audio frequency prompt voice; and 4) outputting the audio frequency prompt voice to feed back to a user. The ultrasonic blind guide device of the invention comprises a transmission module, a receiving module and an audio frequency feedback module, wherein, the transmission module comprises the transmission transducer, a signal generation unit and a microcontroller; the receiving module comprises the receiving transducer and an echo processing unit; and the audio frequency feedback module is used for amplifying a difference-frequency signal and driving an earphone to output an audio frequency signal a. The method can help realize detection and discrimination on a plurality of objects.
Description
technical field [0001] The present invention relates to the technical field of biological sonar, in particular, the present invention particularly relates to an ultrasonic blind guiding method based on biological sonar technology and a portable ultrasonic blind guiding device thereof. Background technique [0002] A blind guide device is an electronic device used to assist a blind person to travel, and is generally called an electronic travel aid (Electronic Travel Aid, ETA) device. The blind guide device is equipped with different types of sensors, which transmit the information of detecting objects in the three-dimensional space ahead to them in a form acceptable to the visually impaired, usually using hearing (such as changes in sound intensity, changes in frequency, timbre, etc.) ) and tactile (such as vibration, stimulation, etc.) ways. According to different detection signals used by blind guide devices, currently formed blind guide systems include: ultrasonic blind g...
Claims
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IPC IPC(8): A61H3/06A61F9/08G01S15/93G01N29/04
Inventor 杨军纪伟许勇
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI