CN101514902A

CN101514902A - Navigation device for the blind

Info

Publication number: CN101514902A
Application number: CNA2008102431336A
Authority: CN
Inventors: 宋爱国; 吴涓; 李志明; 郝飞; 李会军; 许俊超
Original assignee: Southeast University
Current assignee: Jiangsu Jianghai Machinery Group Co., Ltd.
Priority date: 2008-12-01
Filing date: 2008-12-01
Publication date: 2009-08-26
Anticipated expiration: 2028-12-01
Also published as: CN101514902B

Abstract

The invention discloses a navigation device for the blind, which belongs to the field of electronic navigation. A structure of the navigation device for the blind comprises a power module, an information acquisition module, a core decoding module, a driving module and a tactile prompt module, wherein the information acquisition module and the core decoding module transmit signals with each other, an output end of the core decoding module is connected with an input end of the driving module, an output end of the driving module is connected with an input end of the tactile prompt module, and the power module supplies the electricity for all the modules. In view of unique advantage of human tactile sense in the acquisition and perception of information, the device can ensure that the outgoing of the blind does not depend on blind roads or get help from others any more, greatly solves the problem of difficult outgoing of the blind, and enables the independent outgoing of the blind.

Description

A kind of blind man navigation device

Technical field

The present invention relates to a kind of guider, relate in particular to a kind of blind man navigation device, belong to the electronic navigation field.

Background technology

According to statistics, account for 14.61% of disabled person's sum by China person with visual disabilities in 2003, these persons with visual disabilities are subjected to the puzzlement of visual function obstacle and the influence of living environment, and scope of activities is very restricted, and its people and family have become society and gone up one of the most difficult colony of life.Therefore how to expand person's with visual disabilities information perception channel, and then expand the new approaches that its scope of activities becomes this social concern of solution.Sense of touch is an information transfer channel important but that be not fully utilized at present.People's tactilely-perceptible organ is compared with the sense of hearing, the organs of vision very big difference: vision and hearing organ concentrate, and have only when people's notice mainly concentrates on audiovisual, just can the information of carrying out obtain; And people's thigmoreceptor is distributed in people's whole body, does not need special concern of people's notice just can produce touch feeling continuously; The frequency range of tactilely-perceptible can reach KHz far above vision; Haptic stimulus is man-to-man, pointed characteristics; Utilize sense of touch can perception abundant information.Studies show that haptic stimulus can directly pass to visual cortex, this physiological Study substitutes for sense of touch and the expansion visual performance provides the important theory foundation.At present, blind person's walking and trip still depend on the region between the heart and the diaphragm road of urban construction or other people assisting to a great extent.

Summary of the invention

The present invention proposes a kind of blind man navigation device for the problem that solves blind person's trip and expansion blind person scope of activities.

A kind of blind man navigation device, its structure comprises: power module, information acquisition module, core codec module, driver module and sense of touch reminding module, wherein: information acquisition module and the mutual transmission signals of core codec module, the input end of the output termination driver module of core codec module, the input end of the output terminal contacting feeling prompting mould of driver module, power module is given above-mentioned all module for power supply.

The present invention is a kind of blind man navigation device, and this device is to utilize the human body sense of touch can experience extraneous abundant information, and the information response speed mechanism that routine is looked, the sense of hearing is fast is developed.This device can position user's geographic position, and has multiple sense of touch cue, allows the blind person go on a journey to be no longer dependent on sidewalk for visually impaired people or help by other people, has solved blind person's difficult problem of going on a journey largely, and the blind person is independently gone on a journey becomes possibility.

Description of drawings

Fig. 1 is a modular structure block diagram of the present invention.

Fig. 2 is the circuit structure diagram of core decoder module among the present invention.

Fig. 3 is the circuit structure diagram of driver module among the present invention.

Embodiment

As shown in Figure 1, a kind of blind man navigation device, its structure comprises: power module 1, information acquisition module 2, core codec module 3, driver module 4 and sense of touch reminding module 5, wherein: information acquisition module 2 and core codec module 3 mutual transmission signals, the input end of the output termination driver module 4 of core codec module 3, the input end of the output terminal contacting feeling reminding module 5 of driver module 4, power module 1 is given above-mentioned all module for power supply.

Power module 1 has adopted the lithium battery power supply of two joint 3800mAh.Power module 1 is the required level of each module with the level conversion that lithium battery provides.The required level of this system has 1.8V and 3.3V.

Information acquisition module 2 comprises GPS module and digital compass.The GPS module is used to gather the two-dimensional position information of target, i.e. user's absolute geography information is as the longitude and latitude and the road information of Location; The shirtfront that digital compass is used to gather the user towards, be true origin with user promptly, the earth magnetism North and South direction is respectively under the horizontal coordinates of coordinate axis, the user towards level orientation angle information.According to the two-dimensional position information of target and user towards level orientation angle information, can calculate the positional information of target, i.e. the relative horizontal position angle degree and the range information of target with respect to the user.

As shown in Figure 3, core codec module 3 is the controller modules based on embedded system.Consider that from the concrete function and the environment for use angle of situation signal conditioning package kernel processor chip adopts the LPC2294 at grace intelligence Pu.This module converts the information that information acquisition module 2 sends to situation information tactile coding signal according to predetermined encryption algorithm with the situation information data, and sends to driver module 4.

As shown in Figure 4, driver module 4 is that this guider is realized the functional part that tactile data is expressed, and its information translation that core codec module 3 is transmitted is that suitable activation bit drives sense of touch reminding module 5.This driver module 4 mainly is made up of the analog to digital converter MAX5259 and the driver for inductive load NUD3105D of a single-chip microcomputer C8051, four spi bus.

Sense of touch reminding module 5 is used to provide the sense of touch form to stimulate, this guider adopts the vibrating tactile mode, this module is the Vib. of an array of being made up of vibrating motor, promptly be fixed on the waistband around waist one circle by 12 evenly distributed vibrating motors of level angle.According to the coding method of rational system vibration, just can provide the position of two targets and apart from situation information by 12 vibrating motors to the user.

In this guider except that optimal design, the stand-by time that has adopted operating voltage Two monitor levels and high power capacity lithium battery to come extension fixture.The operating voltage Two monitor levels is monitored cell voltage and chip operating voltage respectively, will point out the user to charge when cell voltage reduces to a certain setting value or changes battery.The chip operating voltage supervisory circuit has been used the power monitoring chip CAT1025JI-30 of band I2C storer, and the threshold voltage that resets is 3.0-3.15V, has improved the reliability of system.Signal nRST is connected to the reset pin RESET of kernel processor chip LPC2294.When reset key RST pressed, the RESET pin of power monitoring chip CAT1025JI-30 was exported reset signal at once, and kernel processor chip LPC2294 is resetted.In addition, adopt one road AD to monitor in real time, to guarantee that the prompting user charges or changes battery when battery electric quantity is not enough for the voltage of lithium battery.

The workflow of this guider is:

(1) sets the destination that will arrive from GPS (band touch-screen);

(2) after core codec module 3 receives the command request of GPS, begin to read the current geography information of user;

(3) shortest path that arrives the destination is sought in 3 beginnings of core codec module in existing map;

(4) search out shortest path after, core codec module 3 will constantly read the current geography information of user and compare with shortest path, and point out the user to finish different walking actions by driving sense of touch reminding module 5;

(5) said process is constantly carried out, till arriving the destination.

Claims

1, a kind of blind man navigation device, it is characterized in that: comprise power module (1), information acquisition module (2), core codec module (3), driver module (4) and sense of touch reminding module (5), wherein: information acquisition module (2) and the mutual transmission signals of core codec module (3), the input end of the output termination driver module (4) of core codec module (3), the input end of the output terminal contacting feeling reminding module (5) of driver module (4), power module (1) is given above-mentioned all module for power supply.

2, a kind of blind man navigation device according to claim 1 is characterized in that: core codec module (3) is a kernel processor chip.

3, a kind of blind man navigation device according to claim 1, it is characterized in that: driver module (4) comprises single-chip microcomputer (U31), first socket (J8), second socket (RP1), No. four analog to digital converters and four road feel load drivers, wherein: single-chip microcomputer (U31) connects second socket (RP1) by first socket (J8), the output terminal of second socket (RP1) connects the analog to digital converter input end on every road, and the output terminal of every road analog to digital converter connects every road feel load driver.

4, a kind of blind man navigation device according to claim 1, it is characterized in that: sense of touch reminding module (5) is made up of 12 vibrating motors.