The Design And Development Of Braille-learning Machine Based On File-embedded System

The number of blind people in China is huge and the education level is not high.How to improve the cultural literacy and knowledge level of blind people is a difficult problem to be solved urgently in the harmonious development of our society.As an effective learning tool for blind people,Braille dot display can help blind people to learn without obstacles,acquire knowledge and skills,and have a very broad application prospect.However,the commercialized Braille dot display device is not only expensive in price,but also difficult to match the national conditions of blind school education in our country,and it is difficult to be popularized widely to benefit the vast number of blind people.Therefore,this paper focuses on the development of a high performance and cost effective Braille learning machine with better reading function,the main work is as follows:1.Research and development of embedded file system: this paper takes SD card as external memory of Braille learning machine,studies embedded file system,develops text reading management function,including page turning,chapter directory index and bookmark location,etc.The abundant network reading resources can be transmitted to Braille learning machine to achieve text acquisition and display.2.Research and Development of Chinese Blind Translation algorithm: based on embedded file system,this paper implements a reverse maximum matching algorithm for Chinese-blind translation,which can translate the vertex files of Braille corresponding to Chinese text.The features of the algorithm are as follows: 1)the result of word segmentation accords with the rules of Braille word segmentation,2)the dictionary can be modified to improve the recognition rate of unrecorded words;3)the pinyin of the corresponding words can be directly matched by the phonetic database to avoid the Chinese blind conversion errors caused by the multi-syllable words and improve the recognition rate of the multi-syllable words.3.The overall design and development of Braille learning machine system: according to the functional requirements of Braille learning machine,this paper designed the Braille contact driving module,SD card module,lcd display module,voice broadcast module and other main functional modules.The software system of Braille learning machine is developed.4.Test and verify the function of Braille learning machine: on the basis of embedded file system,this paper tests and verifies the main function of Braille learning machine.The experiments show that the Braille learning machine designed in this paper has high correct rate of Chinese-blind conversion,good reading function and friendly human-computer interaction.