CN100478855C - Braille computer pointing words input system, device and method thereof - Google Patents

Abstract

The invention discloses a braille computer Braille input system, device and method. The system includes a computer handwriting board, a computer, and also includes a Braille input guide, a Braille pen, and a Braille processing module; the Braille input guide is consistent with the size of the writing area of the computer handwriting board, and is installed on the handwriting board writing surface; the computer tablet is connected to the computer through an interface; the Braille processing module is used to perform Braille on the computer tablet when the user utilizes the Braille pen and the Braille input guide , the Braille input signal from the tablet is processed and converted into text. The utility model has the advantages of strong commonality, low cost and convenient use.

Description

Braille computer Braille input system, device and method

technical field

The invention relates to the field of computer input devices, in particular to a Braille computer Braille input system, device and method.

Background technique

There are two main types of Braille schemes commonly used in my country at present. One is the Braille scheme promulgated by the former Ministry of Education in 1953 and promoted throughout the country, referred to as "current Braille". This scheme has 21 initials, 34 finals, tone symbols and punctuation. It takes Beijing phonetics as the standard, putonghua as the basis, word as the unit, and adopts the rules of participle ligatures. Another Braille scheme is the Braille reform scheme approved by the National Language Work Committee in 1988, referred to as "Chinese Shuangpin Braille". The system includes: alphabet, punctuation marks, agreed differentiation method, abbreviation method, subsyllable method, etc., and also adopts the rule of participle and continuous writing.

)组成，一个盲符也简称一“方”。通过六个凸点上有点和无点进行排列组合，就可以表达相应的代码。No matter which braille scheme is adopted, they are all based on "braille characters" as the basic structure, arranged according to the rules of the coding scheme, and feel the scheme through touch (also known as Braille). Blind symbols consist of six raised dots (

) composition, a blind symbol is also referred to as a "square". The corresponding code can be expressed by permuting and combining dots and no dots on the six bumps.

The writing and reading of Braille are quite special, and the writing of Braille is realized by punching holes (braille) on relatively thick paper. When braille, first press the paper between the upper and lower layers of the braille template, and then under the guidance of the braille template, punch holes (braille) from right to left according to the braille coding scheme; The perforated paper is turned over and read by touching the raised dots on the paper from left to right.

With the continuous improvement of my country's informatization level, computers have been widely used in people's work, study and life. However, almost all information industry products, especially computer input/output methods, are designed for ordinary people without considering the application needs of disabled people. Blind people cannot enjoy the convenience brought by information technology like normal people. The current situation of information products has caused the information gap between the blind and normal people to continue to expand, further restricting the ability of the blind to survive and develop in the information society, and unable to truly integrate into normal social life.

In order to solve the problem of blind people inputting Chinese characters on computers, related manufacturers at home and abroad have released some related products. In summary, there are mainly two types, one is to input Braille with the Chinese character input method on the common computer.

The Chinese invention patent application with the application number 01129619.4 discloses a Chinese intelligent computer system for the blind, which mainly consists of a personal computer mainframe capable of accessing the Internet, a microphone connected to each interface of the mainframe, a speaker or earphone, a scanner, and a point display for the blind. It consists of hardware composed of a device and a printer, and software modules arranged in said host computer and related hardware. The invention enables blind people to give full play to their listening, speaking and touching abilities when using a computer, and selectively operate the computer more naturally and conveniently. Make the interactive process more humanized and intelligent. It provides tools for blind people to process documents, communicate with normal people, and teach teachers in schools for the blind.

The Chinese invention patent application with the application number 200410070161.4 discloses a blind-Chinese editing and typesetting system and an editing and typesetting method running on the Windows platform. The Braille editing and typesetting system consists of a Braille input device, an automatic Chinese-Blind converter, a Braille automatic converter, a voice navigator, a printer, a Braille engraving machine, a display, a point display, and a Braille editing and typesetting device. The system has a variety of input and output functions, which can realize high-accuracy automatic translation between Chinese and Braille, "what you see is what you get" typesetting for Braille-Chinese comparison, automatic braille proofreading, and automatic voice following function for Braille users , thus greatly improving the efficiency and practicability of braille typesetting. The Braille control editing and typesetting method realizes the automation of Braille editing and typesetting through the steps of formatted typesetting such as branching, pagination and folio, automatic comparison, synchronous editing, and intelligent proofreading, and provides convenience for Braille publishing.

But obviously these existing input methods are very difficult to use for the blind;

Another method is to define 6 keys on the standard keyboard, corresponding to the six convex points of Braille, and use two hands to operate. The three fingers of the left and right hands correspond to the three points on the left and right of the Braille character. Correspondingly, relatively speaking, the blind do not need to spend too much time to learn, but it is still very inconvenient because several fingers are often required to press the keys at the same time during operation. .

Contents of the invention

The object of the present invention is to provide a Braille computer Braille input system, device and method, which has high versatility, low cost and convenient use.

A kind of Braille computer input system provided for realizing the purpose of the present invention, comprises computer tablet, computer, also comprises Braille input guide plate, Braille pen, and Braille processing module;

The Braille input guide plate is consistent with the size of the writing area of the computer tablet, and is installed on the writing surface of the tablet;

The computer tablet is connected with the computer through an interface;

The Braille processing module is used to process the Braille input signal from the handwriting board when the user uses the Braille pen and the Braille input guide to perform Braille on the computer handwriting board, and convert it into characters .

On the Braille input guide plate, multiple Braille character points are arranged according to its size, and the Braille area of the Braille input guide plate is within the writing area of the handwriting board.

The interface is a general purpose serial interface.

A micro-button is installed at the rear of the nib of the braille pen.

The Braille word processing module includes a coordinate point mapping table, a point coding table, an initialization module, a coordinate reading module, a coordinate-to-braille conversion module, and a braille coding-to-text conversion module, wherein:

The coordinate point mapping table is used to describe the mapping relationship between coordinates and blind character points;

The blind character point coding table is used to describe the corresponding relationship between point and coding;

The initialization module is used to call the computer handwriting board driver to drive the handwriting board, and transfer into the coordinate point mapping table and the blind symbol point encoding table;

The coordinate reading module is used to read and save the input coordinate data of the computer handwriting board when receiving the input signal, and call the coordinate to blind character conversion module and the blind character encoding to text conversion module to perform the input coordinate data deal with;

The coordinate-to-blind character conversion module is used to compare the received coordinate data with the coordinate point mapping table, thereby determining the point of the coordinate, and saving the point, and judging that when one party's input ends, Read out all the point data belonging to the same party, calculate its coded value in binary, and then compare the coded value with the blind character code table, so as to obtain the symbol represented by the code and save it;

The braille-to-text conversion module is used to read out all saved braille codes and convert the braille codes into text after the user inputs the sentence end key.

The coordinate point mapping table is a table with 4 columns and 216 rows, the first column stores the abscissa, the second column stores the ordinate, the third column stores the serial number of the blind symbol, and the fourth column stores the specific point of a blind symbol , each point occupies a row.

The point coding table of the blind characters is a two-column table established according to the national standard of Braille coding. The first column is the coding value of the point, and the second column is the symbol represented by the code.

The code is a pinyin code, and the national standard for Braille coding is the national standard GB/T15720-1995.

Also provide a kind of Braille computer input device for realizing the object of the present invention, comprise computer tablet, Braille input guide plate and Braille processing module, wherein,

The Braille input guide plate is consistent with the size of the writing area of the computer tablet, and is installed on the writing surface of the tablet;

The Braille processing module is used to process the Braille input signal from the handwriting board and convert it into characters when the user performs Braille on the Braille input guide plate.

On the Braille input guide plate, multiple Braille character points are arranged according to its size, and the Braille area of the Braille input guide plate is within the writing area of the handwriting board.

The Braille word processing module includes a coordinate point mapping table, a point coding table, an initialization module, a coordinate reading module, a coordinate-to-braille conversion module, and a braille coding-to-text conversion module, wherein:

The coordinate point mapping table is used to describe the mapping relationship between coordinates and blind character points;

The blind character point coding table is used to describe the corresponding relationship between point and coding;

The initialization module is used to call the computer tablet driver to drive the tablet, and transfer the coordinate point mapping table and the blind character point coding table;

The coordinate reading module is used to read and save the input coordinate data of the computer handwriting board when receiving the input signal, and call the coordinate to blind character conversion module and the blind character encoding to text conversion module to perform the input coordinate data deal with;

The coordinate-to-blind character conversion module is used to compare the received coordinate data with the coordinate point mapping table, thereby determining the point of the coordinate, and saving the point, and judging that when one party's input ends, Read out all the point data belonging to the same party, calculate its coded value in binary, and then compare the coded value with the blind character code table, so as to obtain the symbol represented by the code and save it;

The braille-to-text conversion module is used to read out all saved braille codes and convert the braille codes into text after the user inputs the sentence end key.

The computer tablet is a computer tablet with BS5618 single-chip microcomputer as the main body.

Further provide a kind of Braille pen for realizing the object of the present invention, be used for Braille computer Braille input device Braille, be made up of pen base, penholder, nib and miniature button, described nib is embedded in the described penholder, described penholder top There is a cavity for installing a micro-button, the micro-button is in close contact with the top cover of the pen tip, and the pen base is installed on the top of the pen holder and is firmly connected with the pen holder.

The pen holder is a cylindrical rod; the pen tip is a ballpoint pen tip-shaped rod with a diameter smaller than the pen holder, and a round or square top cover larger than the pen tip at the top.

The pen base is an elliptical sphere.

Further provide a kind of Braille processing method for realizing the object of the present invention, comprise the following steps:

Step A, call the computer tablet driver to drive the tablet, transfer the coordinate point mapping table and the blind character point coding table;

Step B, waiting for the user's braille input, when the input signal is received, read and save the input coordinate data of the computer handwriting board, and call the coordinate to braille character conversion module and the braille character encoding to text conversion module to input the coordinates data processing;

Step C, compare the received coordinate data with the coordinate point mapping table, so as to determine the point of the coordinate, and save the point, and judge that when one party’s input ends, all the point data belonging to the same party will be Read out, calculate its coding value in binary, and then compare the coding value with the blind character coding table, so as to obtain the symbol represented by the code and save it;

Step D, when the user inputs the sentence end key, read out all the saved braille codes, and convert the braille codes into text;

Step E, repeatedly execute steps B to D until the input is completed.

In the step C, the judgment is to compare the point with the previously received point;

If the point belongs to the same party as the point received last time, return to read the new input coordinates.

The beneficial effect of the present invention is: Braille computer Braille input system and device and method of the present invention, it has increased Braille input guide plate, Braille pen and Braille processing module on the basis of common computer tablet, thereby realized Braille The Braille input function of the computer has the advantages of strong versatility, low cost, and convenient use. It fully conforms to the habit of the blind to write Braille at ordinary times, and has a very wide application prospect.

Description of drawings

Fig. 1 is the structural representation of Braille computer Braille input system of the present invention;

Fig. 2 is the structural representation of Braille pen of the present invention;

Fig. 3 is a schematic structural diagram of a Braille processing module of the present invention;

Fig. 4 is a flow chart of the Braille processing method of the present invention;

Fig. 5A is a schematic diagram of one side of Braille characters in the Braille module in the embodiment of the present invention;

Fig. 5B is a schematic diagram of coordinate data corresponding to one braille character in the Braille module in the embodiment of the present invention;

Fig. 6 is the circuit schematic diagram of computer tablet in the embodiment of the present invention;

Fig. 7 is a photographic diagram of a Braille computer Braille input device according to an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, a Braille computer Braille input system, device and method of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The present invention aims at the problems existing in the current existing Braille input method, and proposes a Braille computer Braille input system. The Braille template is installed on the computer handwriting board 4, so that the blind person can input the coordinate position of the Braille word into the computer 6 through the computer handwriting board 4 when they are doing braille on this board, and then the coordinate points are converted into codes and codes by the Braille processing software module. Word.

As shown in FIG. 1 , the Braille computer input system of the present invention includes a computer 6 , a computer tablet 4 , a Braille input guide 1 , a Braille pen 3 , and a Braille processing module 31 .

The Braille input guide plate 1 is consistent with the size of the writing area 5 of the computer tablet 4, and is installed on the writing surface of the tablet.

The computer tablet 4 is connected with the computer 6 through an interface.

The Braille processing module 31 is used to process the Braille input signal from the handwriting board when the user performs Braille on the Braille input guide plate 1 and convert it into characters.

The Braille input guide plate 1 of the present invention is described in detail below: The Braille input guide plate 1 of the present invention refers to the Braille template used by the blind person when writing on paper.

In Appendix A of the national standard GB/T15720-1995, there are regulations on the dot diameter, dot height, dot distance, square distance and line distance of braille characters in the braille template.

The braille input guide plate 1 of the present invention is similar to a ruler and a set square, and is used to assist the braille to determine the point position.

The Braille input guide plate 1 is arranged with some square braille characters 2, preferably, there are 9*28 squares, 4*28 squares, etc., its horizontal direction is 28 squares, and its width is basically the width of 16 sheets of paper quite. Braille input guide plate 1 among the present invention, is according to the size of writing area 5 of computer handwriting board 4, makes correspondingly according to the regulation of national standard, or intercepts a piece from common braille template, is installed on the computer handwriting board 4 then.

That is to say, the Braille input guide plate 1 of the present invention utilizes a common computer tablet 4 to make a Braille input guide plate 1 of a corresponding size according to the size of the writing area 5 of the tablet, and install it on the writing panel of the tablet. surface.

On the Braille input guide plate 1, arrange the multi-party braille characters 2 points according to its size, and ensure that the Braille area of the Braille input guide plate 1 is within the writing area 5 of the handwriting board.

The computer tablet 4 is connected with the computer 6 through the interface.

Preferably, the interface is a universal serial interface.

As shown in Figure 2, the Braille pen 3 of the present invention is described in detail below

Computer handwriting board 4 mainly contains two classes, and a class is pressure board, and another kind is electromagnetic board, and what is commonly used at present is electromagnetic board. The handwriting tablet is equipped with a writing pen. The pen with the pressure plate is very simple, which is a pen-shaped plastic stick. When you press the pen on a point on the pressure plate, the pressure plate can read the current position through pressure induction. The coordinates of the electromagnetic board; the pen equipped with the electromagnetic board is more complicated, with an electromagnetic oscillation circuit and a contact switch inside. When the pen is pressed on a certain point on the electromagnetic board, the electromagnetic board can read the coordinates of the current position through electromagnetic induction. If you use an electromagnetic board, you can directly use the pen that comes with the electromagnetic board; if you use a pressure board, you can also use the original pen, but because the blind person has a penetrating feeling when Braille on paper, and will make a "da da" sound, In order to make blind people feel like braille on paper when they input Braille on a computer braille board, the present invention provides a braille pen 3, which is composed of a pen holder 25, a pen holder 22, a nib 21 and a miniature button 24, as shown in Figure 2 As shown, the pen holder 22 is a cylindrical rod, and the pen tip 21 is a ballpoint pen tip-shaped rod with a diameter smaller than the pen holder 22, embedded in the pen holder 22, and the top has a round or square top cover 23 larger than the pen tip 21; The upper part of the penholder 22 has a cavity for installing the miniature button 24; the miniature button 24 is in close contact with the top cover 23 of the nib 21; Oval sphere.

The design of the pen stand 25 is for the ease of holding the pen in the palm, the nib 21 is used for Braille, and the pen holder 22 is used for fixing the nib 21, and a miniature button 24 is installed at the rear of the nib 21 of the Braille pen 3 simultaneously, so that the pen can be used for Braille. There will also be a little downward displacement, and at the same time it will make a "da da" sound, just like braille on paper.

The miniature button 24 may be a G3B15 series ultra-miniature button of Japan NIKKAI Company.

As shown in FIG. 3 , the Braille processing module 31 of the present invention will be described in detail below.

Described braille word processing module 31 comprises coordinate point mapping table 32, blind symbol point coding table 33, initialization module 34, reads coordinate module 35, coordinates to braille character conversion module 36, and braille character codes to text conversion module 37, wherein :

The coordinate point mapping table 32 is used to describe the mapping relationship between coordinates and blind character points.

Described coordinate point mapping table 32 is a form of 4 columns of 216 rows, the first column stores the abscissa, the second column stores the ordinate, and the third column stores the serial number (1～36, 9*4=36 of blind symbols in total) square blind symbol), the fourth column stores the specific points (1-6) of a blind symbol, and each point occupies one row. Since the present invention has 36 square blind symbols, and each square blind symbol has 6 points, there are a total of 216 lines.

The blind character point coding table 33 is used to describe the corresponding relationship between points and codes.

The point coding table 33 of the blind character is a two-column table established according to the national standard of Braille coding. The first column is the coding value of the point, and the second column is the symbol represented by the code. For example: the first four initials in the Pinyin scheme are represented as: [3-b], [15-p], [13-m], [11-f].

Preferably, the code is a pinyin code, and the correspondence between points and pinyin codes adopts national standards, such as GB/T15720-1995.

The initialization module 34 is used to call the driver program of the computer handwriting board 4 to drive the handwriting board, and transfer the coordinate point mapping table 32 and the blind character point encoding table 33.

The coordinate reading module 35 is used to read and save the input coordinate data of the computer handwriting board 4 when receiving the input signal, and call the coordinates to the blind character conversion module 36 and the blind character encoding to the text conversion module to the input Coordinate data is processed.

Preferably, the coordinate reading module 35 does not save all input points, but uses 6 storage units to save the points of one side, that is to say, it only keeps the coordinate points of the current side of the blind character, and waits until the next side is read. When point coordinates, it converts the saved points into codes, no longer retains the points of this side, but uses these 6 storage units to save the points of the next side.

When the user clicks on the braille board, the computer tablet 4 will send the coordinate position of the point to the computer, and when the coordinate reading module 35 receives the input signal, it reads and saves the input data (coordinates), and calls the coordinates to The conversion module of blind character is processed, then waits for next input, until the user inputs sentence end key, at this moment calls blind character coding to text conversion module 37 again, continues to enter loop after processing.

The coordinates to the blind character conversion module 36 is used to compare the received coordinate data with the coordinate point mapping table 32, thereby determining the point of the coordinate, and saving the point, and judging that when one party's input ends , read out all the point data belonging to the same party, calculate its coded value in binary, and then compare the coded value with the blind symbol code table, so as to obtain the symbol represented by the code and save it.

The coordinate-to-blind character conversion module 36 is invoked by the coordinate reading module 35, and compares the received coordinate data with the coordinate point mapping table 32 to determine the point of the coordinate and save the point. Then compare this point with the point received before, if this point belongs to the same party as the point received last time, then return to the coordinate reading module 35 . If the point does not belong to the same party as the point received last time, take out all the point data belonging to the same party, calculate its coded value in binary, and then compare the coded value with the blind character code table, Thereby obtain the symbol represented by this code, and save in computer 6 li. Return to the coordinate reading module 35 after processing.

Described braille code is transferred to text conversion module 37, is used for after the user inputs sentence end key, reads out all preserved braille codes, and converts braille code into text.

After the user has input the end of sentence key, the conversion module that reads coordinates module 35 calls braille character to literal. It reads out all saved Braille codes and converts Braille codes into text.

The Braille processing module 31 of the present invention can be implemented in C language, run in the computer 6, and can also run in a Braille computer input device and implemented with a digital signal processor (DSP).

As shown in FIG. 4 , it is the working process of the Braille processing module 31 , that is, the flowchart of the Braille processing method of the present invention.

Braille processing method of the present invention comprises the following steps:

Step S1, first run the initialization module 34, call the computer tablet driver to drive the tablet, transfer the coordinate point mapping table 32 and the blind symbol point coding table 33;

The tablet driver is a prior art, and those skilled in the art can reproduce the present invention according to the content disclosed in the present invention, so no detailed description will be given in the present invention.

Step S2, run the coordinate reading module 35, wait for the user's Braille input, when the input signal is received, read and save the input coordinate data of the computer handwriting board, and call the coordinates to the braille character conversion module 36 and the braille character encoding to text The conversion module processes the input coordinate data;

Step S3, run the coordinate-to-blind character conversion module, compare the received coordinate data with the coordinate point mapping table 32, thereby determine the point of the coordinate, save the point, and judge when one party’s input ends , read out all the point data belonging to the same party, calculate its coded value in binary, and then compare the coded value with the blind character code table, so as to obtain the symbol represented by the code and save it;

Compare the received coordinate data with the coordinate point mapping table 32, thereby determine the point of the coordinates, and save the point; then compare the point with the point received in front, if the point Belong to the same party with the point received last time, then return to read coordinate module 35 and read new input coordinates; If this point does not belong to the same party with the point received last time, then will belong to all point data of the same party Read out, calculate its coding value in binary, and then compare the coding value with the blind symbol coding table, so as to obtain the symbol represented by the coding and save it.

Convert the input data into a coordinate position, and save the information, and repeat the conversion and saving process; when an input is not in the position of the blind character 2 of the same party, multiple coordinate points of the blind character 2 of the same party that have been received, According to the national standard of braille coding, such as GB/T15720-1995, convert to braille coding;

Step S4, finally run the conversion module from blind character encoding to text, when the user inputs the sentence end key, the conversion module from blind character to text is invoked by the coordinate reading module 35 . It reads out all saved braille codes and converts braille codes into text;

In step S5, steps S2-S4 are repeatedly executed until the input is completed.

Taking the Braille input of the four characters "Longtenghuyue" as an example to illustrate how the Braille processing method of the present invention realizes the process of converting coordinate points into Braille codes and converting Braille codes into characters.

其中“跃”只有韵母，所以只用一方表示。The pinyin of "Longtenghuyue" is long, teng, hu, and yue. According to the current Braille coding scheme, the braille characters of the consonants and finals are expressed as

Among them, "yue" has only finals, so only one side is used to express it.

而在输入时，则是

Since the blind characters are "reverse dots and positive display", that is, when writing Braille, they are written from right to left, and when reading, they turn the paper over and read from left to right, and the left and right columns of raised dots on the blind characters, It is also just the opposite when inputting and reading, such as the initial consonant l, which is displayed when reading

And on input, it is

As shown in FIG. 5A , the process of the braille processing method is described in detail here with a schematic diagram of one side of the braille symbol position.

As shown in Figure 5B, at first on the Braille input board from left to right, from top to bottom in order for each point, record the coordinates of each point of each side of the Braille character 2, and fill in the coordinate points Bitmap32.

When inputting the four characters "longtenghuyue", the writer just inputs the above nine blind symbols in the nine blind symbol positions from right to left in turn. At the first blind character position, you need to braille at the three points of 123; at the second blind character position, you need to braille at the three points of 256; and so on, at the ninth blind character position Above, you need to use Braille at the five points of 23456.

Then the processing flow of the Braille processing module is: read the input information on the computer handwriting board in turn, after reading the first coordinate information, compare it with the saved coordinate point mapping table 32, and draw that the coordinate belongs to the first The No. 1 point of the square blind character, record the point information; then continue to read the coordinate information, confirm that it is the No. 2 and No. 3 points of the first square blind character, and save these point information respectively; After a coordinate information, after comparison, this point belongs to the No. 2 point of the second party. At this time, compare the 3 point information saved by the previous party with the saved code list, so as to obtain that the code belongs to the initial consonant (1), save the code, and save the No. 2 point information of the second party at the same time, and then continue to read the coordinate information until all the information is input. Finally, use pinyin to convert to text to realize the conversion from code to text.

The structure that realizes Braille computer Braille input system input Braille of the present invention on a kind of existing computer handwriting board 4 is example below, and the present invention is illustrated, but, it should be noted that the example given is not to this invention The definition of the claims of the invention, the claims of the present invention are determined by the scope defined by the claims.

Computer handwriting board 4, also called computer handwriting input board, is subject to liking of more and more users because of its easy to use. As shown in FIG. 6 , the present invention takes the computer tablet 4 with BS5618 single-chip microcomputer as an example to illustrate the Braille computer Braille input system of the present invention.

The computer handwriting board 4 is designed with BS5618 single-chip microcomputer as the core, communicates with the computer 6 through the serial port, directly writes on the glass screen of the handwriting board with a writing pen, and can recognize Chinese characters and graphics conveniently with computer software.

The tablet communicates with the computer using a standard serial port, using five wires TXD, RXD, RTS, DTR, and GND. Among them, the TXD and RXD lines are used to exchange data with the computer 6 respectively, the DTR is used for the computer 6 to provide the required power to the tablet, and the RTS is used to cooperate with the computer 6 to provide a data ready sign.

As shown in Figure 6, the entire tablet hardware module includes:

· Touch screen interface circuit module;

· Communication module;

· Voltage comparator integration module;

·Key module;

·Power regulator module.

Each hardware module of the tablet will be described in detail below.

1. Touch screen

The touch screen adopts a four-wire resistive touch screen. The four-wire resistive touch screen has two inputs and two outputs of X and Y, respectively named XP (X power supply), XIN (X terminal voltage input), YP (Y terminal power supply), YIN ( Y terminal voltage input). Use single-chip microcomputer PA0, PA1, PA2, PA3 pins to connect the four wires of the touch screen, these four pins can be used as ordinary I/O pins, and can also be used as the input of the voltage comparator. Among them, the pins of PA1 and PA2 are set as the input terminals of XP and YP, PA0 is the input terminal of XIN, and PA3 is the input terminal of YIN. When measuring the voltage at the X terminal, the output of PA1 (XP) is high, and the output of PA3 (YP) is low. The voltage output by XIN varies with the position of the pen. It is input to the port PA0, compared with the integral circuit, and converted into a digital quantity. When measuring the voltage of the Y terminal, the output of PA2 (YP) is high, and the output of PA0 (XP) is low. The voltage output by YIN varies with the position of the pen. It is input to the port PA3 and compared with the integral circuit, it is converted into a digital quantity.

Because it is a resistive touch screen, there are certain resistances in the X and Y axis directions respectively. When the writing pen clicks on a certain point, the resistance value changes accordingly, so that the output voltage of the X and Y terminals changes, and the position of the contact point can be calculated.

2. Voltage comparator integration module

In order to judge the specific X and Y axis positions of the writing pen pressed on the glass screen, a single-slope ADC converter is designed by using the voltage comparator function of the BS5618 single-chip microcomputer to convert the voltage of 0-4V into a digital value of 10BITS 0-1023. The working principle of the voltage comparator is to input the voltage to be converted into the voltage comparison input pin of BS5618 (here, PA0 for the X direction and PA2 for the Y direction), using the internal comparator of the BS5618, when the capacitor charge rises from 0V to 4V , divided into 1023 equal parts interrupt time. At each interrupt time, if Vin>Vref (capacitor charging voltage at that time), the voltage comparator will generate a positive signal (read PA0) value. The accumulation will not end until Vin<Vref or 1023 interruptions, and the value of the input voltage can be calculated according to the accumulation result.

In the handwriting board, use transistor 9012, resistors, and capacitors to form an integral circuit, the integral output is 0-4V, and the integral time is 1ms. The PA4 (VERF) pin of the BS5618 microcontroller is connected to the output of the circuit. When the direction of the PA4 pin is set to output, the integral circuit can be cleared, and when the direction of the PA4 pin is set to input, the integral circuit starts.

In the integral program of the single-chip microcomputer, PORT A is set as an output at the beginning, and PORTA4 (PA4/VREF pin) is set as a low-level output, causing the capacitor to discharge to 0V, so it can ensure that the reference voltage starts counting from 0V. Then set PORT A4 (PA4/VREF pin) as the comparator input reference voltage, causing the capacitor to start charging. Since the actual operational amplifier has an input compensation voltage, which is generally about 1-5mv, it means that when V+=V-=0, the output terminal is not zero. To zero the output, a small compensation voltage is applied to the input. Therefore, the compensation delay time is added in the program, and the 0V reference point is moved back as a whole, so as to achieve the function of starting timing correctly.

In the program of the single-chip microcomputer, firstly compare the voltage value of PA0 terminal with PA4 (VREF) to judge whether there is a stroke. If there is a stroke, re-integrate the output of PA1 (XP) to be high, and PA3 (YP) to be low. The voltage output by XIN varies with the position of the pen, and it is input to the PA0 port, and compared with the integral circuit, it is converted into a digital quantity. When measuring the voltage of the Y terminal, the output of PA3 (YP) is high, and the output of PA1 (XP) is low. The voltage output by YIN varies with the position of the pen. It is input to the PA3 port, compared with the integral circuit, and converted into a digital quantity. In this way, the position of a point of the writing pen on the glass screen can be obtained, and the movement track of the writing pen on the glass screen can be obtained by executing the integral comparison program several times.

3. Other modules

The power supply of the whole tablet is provided by the serial port DTR data line of the computer 6, and is provided to active devices such as single-chip microcomputer and triode after passing through the voltage stabilizing circuit. The communication between the serial port of the computer and the single-chip microcomputer has gone through a level conversion circuit. The three buttons of the handwriting board (respectively equivalent to the left, middle and right buttons of the mouse) are respectively connected to the PB0, PB1, and PB2 ports of the BS5618 single-chip microcomputer after being pulled up by a resistor.

The program of the single-chip microcomputer in the tablet is closely coordinated with the recognition program of the tablet in the computer. After starting the recognition program in the computer, the DTR of the serial port of the computer is at a high level, which provides power for the tablet, and at the same time, the single-chip computer in the tablet is powered on and reset .

After the microcontroller is reset, it first executes the initialization program to set up the memory unit and ports. The next step is to communicate with the computer handshake. Communication data format: baud rate 9600, one start bit, two stop bits, 8 data bits. The computer program sets RTS to low, and sends four different identification codes to the handwriting board respectively. After receiving the identification code once, the microcontroller in the handwriting board sends the received identification code back to the computer according to a certain encoding method, four times. After the connection is correct, the computer considers the handshake successful. Put RTS as high level, the one-chip computer enters the data acquisition (integration) procedure. In the integral program, the single-chip microcomputer starts the data comparator, and constantly compares the output of the X terminal of the four-wire resistive touch screen, so as to judge whether there is a pen drawn on the screen. If there is a stroke, it will restart the comparator to continuously measure its accurate X and Y positions, and then test whether the three keys on the left, middle and right on the handwriting board are pressed, and combine the measured X and Y positions with the three The state of each key is compiled into a data packet and sent to the computer. After sending, continue to detect the next position of the pen on the screen and repeat the previous step until the pen is lifted. After receiving a series of location data, the computer displays its trajectory on the screen, and can load the handwriting recognition system, so that the words we write on the screen of the tablet can be displayed on the computer screen.

As shown in FIG. 7 , the embodiment of the present invention takes the "Xiao Zhuangyuan" computer tablet produced by Hanwang Company as an example to illustrate the Braille computer Braille input system of the present invention.

The "Little Champion" computer tablet is a pressure-type computer tablet, which communicates with the computer through a universal serial interface (USB). Enter the written information into the computer.

The physical size of the writing area of the "Little Champion" computer handwriting board is 5.8cm*4.5cm. According to this size, the embodiment of the present invention cuts out a piece of 9*4 squares from the common Braille template, and its size is the same as that of computer handwriting. The size of the board writing area is consistent, and then it is installed in the writing area of the computer tablet, thereby forming a Braille input guide plate 1.

The "Little Champion" computer handwriting board also has 3 customizable keys above the writing area, and the present invention defines the leftmost key as the sentence input end key.

When Braille is written normally, because it is perforated on the paper, Braille has a sense of penetration and makes a "da da" sound. In order to make it possible for the blind to enter Braille on the computer Braille board like Braille on paper Feeling, the present invention provides a kind of Braille pen 3, and its external shape is the same with common Braille pen, does not have uncomfortable feeling when using like this. But the structure is changed to some extent, it is made up of pen holder 25, pen holder 22, nib 21 and miniature button 24, and the design of pen holder 25 is to be convenient to hold a pen in the palm, and nib 21 is used for Braille, and pen holder 22 is used for fixing nib 21, At the same time, a miniature button 24 is installed at the rear of the nib 21 of the Braille pen 3. Its effect is that the pen also has a little downward displacement when Braille pen 3, and also makes a sound of "da da" at the same time, just following on the paper. Braille feels the same.

The Braille computer input system of the present invention adds a Braille input guide plate 1, a Braille pen 3 and a Braille processing module 31 on the basis of an ordinary computer tablet, thereby realizing the Braille computer input function. It has the advantages of strong versatility, low cost, convenient use, etc., fully conforms to the usage habits of blind people in writing Braille at ordinary times, and has a very wide application prospect.

Other aspects and features of the present invention will be apparent to those skilled in the art from the above description of specific embodiments of the present invention in conjunction with the accompanying drawings.

The specific embodiments of the present invention have been described and illustrated above, and these embodiments should be considered as exemplary only, and are not used to limit the present invention, and the present invention should be interpreted according to the appended claims.

Claims (15)

1, a kind of Braille computer pointing words input system comprises writing board for computer, and computing machine is characterized in that, also comprises Braille input guide plate, braille pen, and Braille processing module;

Described Braille input guide plate is consistent with the size of writing the zone of described writing board for computer, is installed in the writing surface of writing board for computer;

Described writing board for computer is connected with described computing machine by interface;

Described Braille processing module is used for the braille input signal from writing board for computer being handled, and being converted to literal when the user utilizes described braille pen and described Braille input guide plate to carry out braille on described writing board for computer;

Described braille pen, be used for braille on the Braille computer pointing words input media, form by pen stand, penholder, nib and mini button, described nib is embedded in the described penholder, described penholder top has the cavity of an installation mini button, described mini button closely contacts with the top cover of nib, and described pen stand is installed in the top of penholder, is fastenedly connected with penholder.

2, Braille computer pointing words input system according to claim 1, it is characterized in that, on the described Braille input guide plate, according to the blind in many ways symbol point of its size arrangement position, braille zone the writing in the zone of described Braille input guide plate at writing board for computer.

3, Braille computer pointing words input system according to claim 1 is characterized in that, described interface is a USB (universal serial bus).

4, according to each described Braille computer pointing words input system of claim 1 to 3, it is characterized in that, described Braille processing module comprises coordinate points position mapping table, blind symbol point position coding schedule, initialization module, the coordinate reading module, coordinate is to blind symbol conversion module, and blind symbol is encoded to the text conversion module, wherein:

Described coordinate points position mapping table is used to describe the mapping relations of coordinate to blind symbol point position;

Described blind symbol point position coding schedule is according to blind symbol coding national standard, the form of one two row of foundation, and first row are blind symbol encoded radios of blind symbol point position, secondary series is the represented blind symbol coded identification of this blind symbol encoded radio;

Described initialization module is used to call the writing board for computer driver and drives writing board for computer, calls in coordinate points position mapping table and blind symbol point position coding schedule;

Described coordinate reading module is used for when receiving the braille input signal, reads and preserve the input coordinate data of writing board for computer, and calls coordinate and be encoded to the literal conversion module to blind symbol conversion module and blind symbol the coordinate data of being imported is handled;

Described coordinate is to the conversion module of blind symbol, the coordinate data and the coordinate points position mapping table that are used for receiving are compared, thereby determine the blind symbol point position of this coordinate, and this blind symbol point position of preservation, and when determining side's end of input, all blind symbol point bit data that will belong to same side are read, and go out its blind symbol encoded radio by binary computations, then blind symbol encoded radio and blind symbol point position coding schedule are compared, thereby obtain represented blind symbol coded identification of this blind symbol encoded radio and preservation;

Described blind symbol is encoded to the modular converter of literal, is used for after the user has imported the sentence end key, and the blind symbol coded identification of all preservations is read, and converts blind symbol coded identification to literal.

5, Braille computer pointing words input system according to claim 4, it is characterized in that, described coordinate points position mapping table is the form of one 4 row 216 row, first row are deposited horizontal ordinate, secondary series is deposited ordinate, the 3rd row are deposited the sequence number of blind symbol, and the 4th row are deposited the concrete blind symbol point position of a blind symbol, and each blind symbol point position accounts for delegation.

6, Braille computer pointing words input system according to claim 4 is characterized in that, described blind symbol is encoded to Pinyin coding, and described blind symbol coding national standard is the GB/T15720-1995 national standard.

7, a kind of Braille computer pointing words input media comprises writing board for computer, it is characterized in that, also comprises Braille input guide plate and Braille processing module, wherein,

Described Braille input guide plate is consistent with the size of writing the zone of described writing board for computer, is installed in the writing surface of writing board for computer;

Described Braille processing module is used for the braille input signal from writing board for computer being handled, and being converted to literal when the user uses braille pen to carry out braille on described Braille input guide plate; Described braille pen, be used for braille on the Braille computer pointing words input media, form by pen stand, penholder, nib and mini button, described nib is embedded in the described penholder, described penholder top has the cavity of an installation mini button, described mini button closely contacts with the top cover of nib, and described pen stand is installed in the top of penholder, is fastenedly connected with penholder.

8, Braille computer pointing words input media according to claim 7, it is characterized in that, on the described Braille input guide plate, according to the blind in many ways symbol point of its size arrangement position, braille zone the writing in the zone of described Braille input guide plate at writing board for computer.

9, according to claim 7 or 8 described Braille computer pointing words input medias, it is characterized in that, described Braille processing module comprises coordinate points position mapping table, blind symbol point position coding schedule, initialization module, the coordinate reading module, coordinate is to blind symbol conversion module, and blind symbol is encoded to the text conversion module, wherein:

Described coordinate points position mapping table is used to describe the mapping relations of coordinate to blind symbol point position;

Described blind symbol point position coding schedule is according to blind symbol coding national standard, the form of one two row of foundation, and first row are blind symbol encoded radios of blind symbol point position, secondary series is the represented blind symbol coded identification of this blind symbol encoded radio;

Described initialization module is used to call the writing board for computer driver and drives writing board for computer, calls in coordinate points position mapping table and blind symbol point position coding schedule;

Described coordinate reading module is used for when receiving the braille input signal, reads and preserve the input coordinate data of writing board for computer, and calls coordinate and be encoded to the literal conversion module to blind symbol conversion module and blind symbol the coordinate data of being imported is handled;

Described coordinate is to the conversion module of blind symbol, the coordinate data and the coordinate points position mapping table that are used for receiving are compared, thereby determine the blind symbol point position of this coordinate, and this blind symbol point position of preservation, and when determining side's end of input, all blind symbol point bit data that will belong to same side are read, and go out its blind symbol encoded radio by binary computations, then blind symbol encoded radio and blind symbol point position coding schedule are compared, thereby obtain represented blind symbol coded identification of this blind symbol encoded radio and preservation;

Described blind symbol is encoded to the modular converter of literal, is used for after the user has imported the sentence end key, and the blind symbol coded identification of all preservations is read, and converts blind symbol coded identification to literal.

10, Braille computer pointing words input media according to claim 9 is characterized in that, described writing board for computer is the writing board for computer based on the BS5618 single-chip microcomputer.

11, a kind of Braille pen, it is characterized in that, be used for braille on the Braille computer pointing words input media, form by pen stand, penholder, nib and mini button, described nib is embedded in the described penholder, and described penholder top has the cavity of an installation mini button, and described mini button closely contacts with the top cover of nib, described pen stand is installed in the top of penholder, is fastenedly connected with penholder.

12, Braille pen according to claim 11 is characterized in that, described penholder is cylindric barred body; Described nib be a diameter less than the pointed rod of the ball pen of penholder, the top of nib has a circular or square top cover greater than nib.

13, according to claim 11 or 12 described Braille pens, it is characterized in that described pen stand is an oval-shaped ball.

14, a kind of Braille disposal route is characterized in that, comprises the following steps:

Steps A is called the writing board for computer driver and is driven writing board for computer, calls in coordinate points position mapping table and blind symbol point position coding schedule;

Step B, wait for that the user uses braille pen to carry out the braille input, when receiving the braille input signal, read and preserve the input coordinate data of writing board for computer, and call coordinate and be encoded to the literal conversion module to blind symbol conversion module and blind symbol the coordinate data of being imported is handled; Described braille pen, be used for braille on the Braille computer pointing words input media, form by pen stand, penholder, nib and mini button, described nib is embedded in the described penholder, described penholder top has the cavity of an installation mini button, described mini button closely contacts with the top cover of nib, and described pen stand is installed in the top of penholder, is fastenedly connected with penholder;

Step C, the coordinate data and the coordinate points position mapping table that receive are compared, thereby determine the blind symbol point position of this coordinate, and this blind symbol point position of preservation, and when determining side's end of input, all blind symbol point bit data that will belong to same side are read, and go out its blind symbol encoded radio by binary computations, then blind symbol encoded radio and blind symbol point position coding schedule are compared, thereby obtain represented blind symbol coded identification of this blind symbol encoded radio and preservation;

Step D after the user has imported the sentence end key, reads the blind symbol coded identification of all preservations, converts blind symbol coded identification to literal;

Step e, repeated execution of steps B～D is till end of input.

15, Braille disposal route according to claim 14 is characterized in that, described step C, and described judgement is that this blind symbol point position and the blind symbol point position that receives are previously compared;

If this blind symbol point position does not belong to same side, then side's end of input with the blind symbol point position that received last time.

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