Braille reading display terminal device

Abstract: The present invention relates to a braille reading display terminal device in which a braille reading input/output unit 1 is connected to a host computer 2 through an expansion bus 2a, an expansion bus interface 1d is interposed between the input/output sections of the braille reading input/output unit 1 and the expansion bus 2a, and unit input/output elements of the input/output sections 1a to 1c are accessed or controlled through the expansion bus 2a based on software 2b and 2d.

Description: The present invention relates to a braille reading display terminal device which is improved in an interface between the unit and its host computer. A conventional braille reading display device is connected to a personal computer serving as a host computer and has an intelligence function of inputting braille informations, reading the information from tactile pins display, and outputting the information as a voice in combination with a voice synthesizer. Since the conventional braille reading display device comprises a microprocessor having a ROM for storing braille codes and a RAM for temporarily storing processing information to input/output braille informations, and a DIP SW (dual inline package switch) for selecting various braille notations (e.g., six-dot pattern and eight-dot pattern) from the ROM. Like generally-used peripheral terminal units of personal computers, the conventional braille reading display device is connected to various personal computers through RS-232C or CENTRONICS, both of which are standard interfaces, with the result that information is transferred in series or in parallel between the device and the personal computers through the interface. Information processing peculiar to the braille reading display device is executed by the microprocessor included therein. However, the conventional braille reading display device has the following drawbacks. (1) Since a widespread braille notation methods has not yet been established, information stored in a ROM has to be rewritten and the ROM has to be exchanged with another in accordance with various braille notation methods. Since an exchange of ROMs is difficult for users, it is usually performed by makers. In most cases, however, it is difficult even for makers because the ROMs are widely used. (2) It is troublesome to select one of interfaces RS-232C and CENTRONICS and set a transfer speed, various parameters, etc. using the DIP SW, in order to select a necessary one from various braille notations stored in a ROM. (3) Since a program of grammar (e.g., Six-Dot Japanese Braille Notation) proper to braille notations has to be stored in a ROM, the capacity of the ROM is increased. (4) Since there are different methods for representing Chinese characters by braille notations, the braile reading display device cannot be applied to all the methods. (5) Since various peripheral units are required in addition to a CPU, a ROM, and a RAM, the cost of hardware is increased. The publication "IEEE Transactions on Consumer Electronics" (36, (1990)) 121 describes a Braille display terminal for personal computers which enables visually handicapped people to have real time interaction with the computers. This terminal comprises an electro-mechanical Braille display unit which is controlled by a separate control unit being driven by the personal computer. The conventional Braille reading display devices have the drawback of increasing the total costs including running costs, debug costs and the like, which puts much strain on both the producers and the users. The present invention has been developed to resolve the above drawbacks and its object is to provide a Braille reading display terminal device which has a large part of hardware in common with the host computer to simplify the structure and decreases the total costs. This object is solved by a Braille reading display terminal device comprising the features of claim 1. Advantageous embodiments of the device are defined in the dependent claims. According to a preferred embodiment of the present invention, a Braille reading display terminal device comprises input/output means having a plurality of unit input/output elements and a host computer connected to the input/output means to transfer information including control information between the host computer and input/output means. The braille reading display terminal device further comprises anexpansion bus for connecting the host computer and the input/output means, interface means for connecting the host computer and the unit input/output elements of the input/output means, and software of the host computer for accessing or controlling the unit input/output elements of the input/output means through the expansion bus. Having the above structure, the braille reading display terminal device is simple in structure of hardware for accessing or controlling the input/output means and able to change programs without exchanging ROMs and the like. The following expected results can be obtained from the braille reading display terminal device of the present invention. (1) Since the number of elements of the device can be reduced, the structure of hardware is simplified, the total costs is lowered, the failure rate is dropped, the device is compacted and lightened, and the power necessary for operating the device is saved. (2) Since software for controlling the device can be changed by the host computer such as a personal computer, the ROM in the device need not be exchanged to another. The braille reading display terminal device can be applied to various types of braille notations and multilanguage. (3) Since the speed required for information processing of the device is much lower than that for processing of external memory devices, image and communication processing, etc., a CPU chip of a standard MS-DOS personal computer can execute information processing in idle time, and the capability of the CPU chip can be heightened with efficiency. Fig. 1 is a block diagram of the structures of hardware of a braille reading input/output unit and software of a personal computer according to an embodiment of the present invention. An embodiment of the present invention will now be described, with reference to the accompanying drawing. Fig. 1 is a block diagram of the structures of hardware and software according to the embodiment of the present invention. In Fig. 1, a braille reading input/output unit 1 includes a braille keyboard 1a serving as input means, and a tactile reading display 1b and a voice synthesizer 1c both serving as output means. The braille keyboard 1a, tactile reading display 1b, and voice synthesizer 1c are connected to an expansion bus 2a of a personal computer 2 serving as a host computer through an expansion bus interface 1d by means of a connecting cable 3. The braille keyboard 1a is intended to convert characters, symbols, and the like into braille codes and includes a plurality of unit keys for outputting a predetermined key code in accordance with a six dot or eight dot codes. The tactile reading display 1b is formed of a plurality of braille cells of six dot or eight dot codes of piezoelectric elements. The braille codes are displayed by projected tactile pins formed at free ends of the piezoelectric elements, which can be bent. The piezoelectric elements thus form device output elements of the tactile reading display 1b. The voice synthesizer 1c generates a predetermined synthesized voice based on informations supplied from the expansion bus 2a. An information line of the expansion bus 2a includes eight data lines and several control lines to transmit parallel 8-bit data line information and control information in series from the personal computer 2 to the braille reading input/output unit 1. The expansion bus interface 1d distributes the data line information to the braille keyboard 1a, the tactile reading display 1b, and the voice synthesizer 1c, on the basis of the control information. The personal computer 2 stores information necessary for controlling the braille reading input/output unit 1 in a floppy disk (not shown). The braille reading input/output unit is controlled by managing all of the braille keyboard 1a, the tactile reading display 1b, and the voice synthesizer 1c, based on the information stored in the floppy disk. For example, an operation for discriminating an input braille codes by key data transmitted from the braille keyboard 1a, a code system and a grammar of braille notations (six dot and eight dot patterns) for controlling the piezoelectric elements of the braille cells of the tactile reading display 1b, a method of converting Chinese characters, foreign languages, etc. into braille codes, and the like are managed, but the braille reading input/output unit 1 has nothing to do with this management. Software for controlling the finger-reading input/output unit 1 includes an MS-DOS system 2b of MICROSOFT, application software 2c on sale for a normal operation, and a device driver 2d for controlling the braille reading input/output unit 1. The device driver 2d is added to an OS (operating system) or is a form of software operating as one process of the OS. The software for controlling the unit 1 is stored in the floppy disk and supplied therefrom. The braille reading input/output unit 1 is controlled by means of the software placed on a memory. The software is a form of a device driver, and the device driver 2d controls input/output of the braille keyboard 1a, the tactile reading display 1b, and the voice synthesizer 1c of the braille reading input/output unit 1 by a fixed-cycle interrupt. According to the above embodiment, all the information on the input/output control of the braille reading input/output unit 1 is managed by the personal computer, and the unit 1 has no intelligence functions.

Claims: A Braille reading display terminal device comprising: input/output means (1), including a Braille reading keyboard (1a), a Braille reading display (1b) and a voice synthesizer (1c), for inputting and outputting data; an expansion bus (2a) having an interface function; and a host computer (2) connected to said input/output means through said expansion bus; characterized in that said input/output means and said expansion bus (2a) having no intelligence functions therein, and said host computer (2) including software controlled means (2b, 2c, 2d) for exclusively controlling transferring of information including control information between said host computer (2) and said input/output means (1), and wherein said host computer (2) accesses and controls at least one of said Braille reading keyboard (1a), said Braille reading display (1b) and said voice synthesizer (1c) of said input/output means (1) through said expansion bus (2a) without requiring intelligence functions in said input/output means (1) or in said expansion bus (2a), and wherein said input/output means (1) and said expansion bus (2a) do not control said transferring of information between said host computer (2) and said input/ output means (1). The Braille reading display terminal device of claim 1, wherein said Braille reading keyboard (1a) comprises a finger reading keyboard. The Braille reading display terminal device of claim 2, wherein said Braille reading display (1b) comprises a tactile finger reading display. The Braille reading display terminal device of claim 1, wherein said Braille reading display (1b) comprises a tactile finger reading display. The Braille reading display terminal device of claim 4, wherein said tactile finger reading display comprises a tactile pin display having projected tactile pins arranged to be touched by a finger of a user. The Braille reading display device of claim 1, wherein said expansion bus comprises: an expansion bus interface (1d) in said input/output means (1) for distributing data to an from the Braille reading keyboard (1a), the Braille reading display (1b) and the voice synthesizer (1c), on the basis of control information received from said host computer (2); a multi-line expansion bus (2a) in said host computer (2); and connecting cable means (3) coupled between said expansion bus interface (1d) of said input/output means (1) and said multi-line expansion bus (20) of said host computer (2) for transmitting information signals therebetween.

Inventors: HIRANO HIROSHI, OSAKI YOSHITAKA, YAMAZAKI JUNJI, HIRANO, HIROSHI, OSAKI, YOSHITAKA, YAMAZAKI, JUNJI, Hirano, Hiroshi, c/o NEC Corporation, Yamazaki, Junji, c/o KGS CORPORATION
Applicants: KGS KK, NIPPON ELECTRIC CO, KGS CORPORATION, NEC CORPORATION
Application year: 1992
Main classification: G09B21
IPC codes: G09B21, G09G5, G06F3, G09F9