JPS5939049B2 - Code conversion method - Google Patents

Description

Detailed Description of the Invention The present invention uses a code table divided into a plurality of sub-tables, selects a sub-table based on an input code, and calculates the representative code in the sub-table and the contents of a displacement table according to the ranking. The present invention relates to a code conversion method for converting the manual code into a corresponding code.

Conventionally, when you want to convert an input code from a certain input device into another code and output it to a target device, for example, as shown in FIG. A system is often used in which the coordinate code is sent to a character code, which is converted into a character code, and then displayed on a display 4 via a character generator 3.

In this case, code table 2 is stored in the same way as normal memory.
The coordinate code of the key switch is used as an address, and the character code is stored as data. Since this code table is attached around the display device, it is desirable that the processing is simple and that it is compressed into a small size.

Such code conversion is usually applied when a coordinate code from a keyboard or the like is converted into a consecutive character code and then supplied to a character generator as an interface code.

An object of the present invention is to provide a code conversion method using a code table that is easy to process and compressed into a small size.

In order to achieve the above object, the code conversion method of the present invention converts an input code into a code corresponding to the input code using a code table and outputs the code, in which the code table is divided into a plurality of sub-tables. Each sub-table consists of one representative code and a displacement table corresponding to the rank of each code in the table, and the input code is decoded to select a sub-table in the code table, and the representative code in the sub-table is selected. The present invention is characterized in that a code is calculated according to the contents of a displacement table corresponding to the ranking within the table, and a corresponding code is output.

The present invention will be described in detail below with reference to examples.

FIG. 2 is an explanatory diagram showing the configuration of an embodiment of the present invention.

3, the keyboard 1 represents multiple switch positions using coordinate (X.Y) codes, such as X code N.

-N4 creates four zones A. B. C. Classify into D.
Then, these coordinate codes are sent to the X coordinate calculation circuit 11 and the ranking calculation circuit 12, and in the X coordinate calculation circuit 11,
The value of the X coordinate is N shown in Table 1. -n1, n1~N2, N
When in the ranges 2 to N3 and N3 to N4, table selection signals 4, 8, 0, and 9 are output, respectively, and the corresponding serve table knobs of the code table 13 are set to {~, 1B1, 0, (L
)l. In the next ranking calculation circuit 12, the coordinates X. from the keyboard 1. Y and signals Nx-1, nX indicating the range of the selected zone from the X coordinate calculation circuit 12, the X. Y position rank 0)
A ranking signal indicating ? is calculated using equation (1).

For example, suppose the key switch coordinates are X-6, YlO,
The range of A zone is N. -0,. If n1-10, the rank (1) will be.

That is, the coordinate address X, .
Y corresponds to the 106th address of the selected A zone. In order to obtain the character code stored at this address with a small storage capacity, in the present invention, as shown in FIG. , the intra-table displacement table 22 corresponding to the above-mentioned intra-table order is arranged in another 1-byte area.

As shown in FIG. 2B, each displacement table 22 represents displacement 1 corresponding to rank (1) in the table in 1 byte. And the character code to be converted is the first code in the zone and the displacement 1
are output and added by the arithmetic circuit 14 to output an interface code represented by equation (2) to be supplied to the interface of the target device. When performing such code conversion, the data of the selected sub-table requires 2 bytes for each character code in the conventional method, but in the method of the present invention, only the first code in the table requires 2 bytes. Since the character code is output in the form of adding displacement to this first code, it is possible to reduce the number of bytes per character code to just over 1 byte.

Note that the arithmetic circuit 14 modifies the representative code according to the contents of the displacement table, and includes not only arithmetic operations but also logical operations.

As explained above, according to the present invention, a code table divided into a plurality of sub-tables is used, a sub-table is selected by manual code, and the representative code in the sub-table, for example, corresponds to the first code and address order in the table. By calculating the contents of the displacement table, it can be converted into an interface code or the like.

This makes it possible to perform code conversion with relatively simple processing and a small storage capacity as described above, making it an advantageous configuration to be installed around the target device.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional example, FIG. 2 is an explanatory diagram showing the configuration of an embodiment of the present invention, and FIGS. b is an explanatory diagram of the main parts of the embodiment shown in FIG. 2, in which 1 is a keyboard;
is an X coordinate calculation circuit, 12 is a ranking calculation circuit, 13 is a code table, 14 is a calculation circuit, 20 is a sub table, 21
22 indicates the first code within the table, and 22 indicates the displacement table within the zone.

Claims (1)

[Claims] 1. In a code conversion method in which an input code is converted into a code corresponding to the input code using a code table and output, the code table is divided into a plurality of sub-tables, and each sub-table contains one representative code and the table. It consists of a displacement table corresponding to the rank of each code in the
decoding the input code to select a sub-table in the code table, calculating a representative code in the sub-table according to the contents of a displacement table according to the rank in the table, and outputting a corresponding code; Characteristic code conversion method.