JPH0318192B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a character generator CG (hereinafter simply referred to as CG) for kanji used in a dot matrix type kanji printer device, a kanji display device, etc.
In particular, the present invention relates to a character generator for Kanji characters that detects and corrects erroneous bits included in a character pattern, thereby making it possible to send out a correct pattern when specifying the same character pattern thereafter.

Prior Art and Problems Conventionally, when there are missing bits in the CG of kanji characters used in kanji printers, kanji display devices, etc., there has been no particular effort to check and correct them. Therefore, if a kanji pattern with missing bits is printed using a kanji printer, for example, it may become unsightly depending on the position of the missing dots, and the unsightliness may be particularly noticeable when copying paper is used. The drawback was that it emphasized the situation even more. Another problem was that if you tried to replace it with a normal character generator ROM for kanji, you would have to pay a large price.

Purpose and main points of the invention The present invention aims to solve the above-mentioned problems, and when starting the operation of a kanji printer, etc., it detects errors in character patterns in CG and generates corresponding correct character patterns. Alternatively, a kanji character with an error correction means can be introduced and stored in RAM, etc., and when that character pattern is specified, the corresponding correct character pattern can be output from RAM. It provides a generator.

Embodiments of the Invention The present invention will be described below with reference to Examples.

FIG. 1 shows the configuration of an embodiment apparatus in which the present invention is applied to a printer. In the figure, 1 is
Main unit such as CPU, 2 is printer control device, 3
is the printer's print driver mechanism, 4 is the microprocessor MPU for printer control, and 5 is the printer's print driver mechanism.
The control memory CS, 6 consisting of ROM, carries out an error check routine for the CG pattern stored in the CS, and performs a correct CG pattern instead of an error CG pattern.
A correction output routine performs management control for outputting patterns, 7 is a CG composed of ROM, and 8 has a work area necessary for printer control.
RAM 9 is a storage area for the CG pattern management table 9a and CG pattern file 9b, 1
0 is a buffer for printing. In the CG pattern management table in RAM, only the kanji code of the CG pattern in which a dot error was detected among the CG patterns in the CG is registered in advance, and at the same time, the correct kanji code corresponding to that kanji code is registered in the CG pattern file. CG patterns are stored.

Next, the configuration of an embodiment of CG7 in FIG. 1 will be described. Figure 2 shows 256K per chip.
Kanji CG using 9 bit-sized ROMs
This figure shows one CG pattern ``Kan'' when configuring ``Kan''. #1 to #9 are 9 ROMs
It shows a chip and represents one kanji pattern in a 24 x 24 matrix.

FIG. 3 shows the configuration of an embodiment for detecting and correcting bit errors in the CG pattern. In the figure, 7 indicates CGROM, and nine CG chips #1 to #9 are stacked vertically in a 32K x 8-bit configuration, and divided horizontally into 8-bit units to arrange 4K character patterns. This is what I did.
12 is a horizontal parity bit ROM, and 13 is a vertical parity bit ROM.

The ROMs 12 and 13 calculate the odd parity between the horizontal direction and the vertical direction, respectively, for all bits of CG7 that are known to be correct.
The calculated parity bits are stored in a ROM separate from the CG chip. Therefore, since it is installed in each printer, even if a bit error occurs when copying CG7 from a correct CG, as long as it is a single bit error, the third
As shown by , in the figure, the intersection coordinates of the locations where both horizontal and vertical parity errors exist are given by
Erroneous bits can be detected and corrected.
Since most of the errors are usually single bit errors,
There is no problem in making corrections using such assumptions.

The pattern error check for the CG chip is performed as shown in Figure 1 at the initial check such as when the power is turned on.
CG pattern check stored in CS
This is done using a routine as follows.

First, all CG chips #1 to #9 are read, the number of dots "1" is calculated in each of the horizontal and vertical directions, and the expected odd parity bits are calculated. Next, the parity bits calculated in this way are
Correct (tentatively) read from ROM12, 13
The validity of the CG pattern in horizontal, vertical, and both directions is sequentially checked by comparing it with the parity bit.

In the example shown in Figure 3, since the pattern bit is said to be in error, the horizontal odd parity and vertical odd parity are different from the calculated odd parity, so it is difficult to know that there is an error. Can be done. Moreover, if it can be determined that there is an error in the pattern, the correct pattern can be immediately known.

The pattern error checking method shown in FIG.
Although this is sufficient for practical use, it cannot deal with multiple bit errors in each horizontal and vertical direction. In such cases, when a more rigorous check is required, you can subdivide the CG into blocks of appropriate size and perform a horizontal and vertical parity check for each block, or use an error correction code (ECC). ) may be employed as appropriate.

Regarding the CG pattern containing the bit error in CG7 detected as described above, its kanji code and corrected CG pattern are shown in Figure 1.
The data is stored in the CG pattern management table 9a and CG pattern file 9b in the RAM 8. FIG. 4 shows the configuration of the CG pattern management table and CG pattern file in the RAM 8.

Next, according to the operation flow shown in Figure 5,
The operation of the embodiment device shown in FIG. 1 will be explained. This flow shows the processing of the CG pattern correction output routine in CS.

The main body device 1 starts printing the printer and sends print data to the printer control device 2. in the control device 2
The MPU4 stores the received print data in the RAM.
The data is stored in the data buffer set in the work area within 8.

Next, the CG designation code ni (kanji code) of the character to be printed first is read from the print data in the data buffer.

The read CG designation code ni is compared with one CG code in the CG pattern management table 9a.
If a match is found, CG pattern file 9
The corresponding correct CG pattern is read from b (FIG. 4) and transferred to the printing buffer 10. On the other hand,
If no match is found, another CG code in the CG pattern management table is read and the same process as the previous one is performed.

When all the CG codes in the CG pattern management table 9a and the CG designation code ni to be printed are completed without a match being found,
Read the corresponding CG pattern from ROM CG7,
Transfer to printing buffer 10.

Finally, necessary editing processing is performed on the CG pattern in the print buffer 10, and the result is output to the print driver/mechanism section 3 for printing.

When the above operations are completed, the CG designation code of the next character to be printed is read from the data buffer in the RAM, and the same CG pattern is output and printed repeatedly.

In the description of the embodiments above, the correct CG pattern stored in RAM in response to a bit error CG pattern is
The CG pattern was generated by correcting the bit error CG pattern, but this can be replaced with one transferred from the CG pattern master file normally stored in the main unit. Figure 6 shows
It is a schematic explanatory diagram.

In FIG. 6, the CG of the bit error pattern detected during the CG check of the printer control device 2 is shown.
The code is sent to the main device 1. The main device 1 searches the CG pattern master file according to the received CG code, reads out the corresponding correct CG pattern, and transfers it to the printer control device 2 together with the CG code. Printer control device 2
converts the correct CG pattern sent from the main device 1 into a CG code and stores it in the CG pattern file 9b.

The present invention has been explained above using a printer as an example, but it can also be applied to a display device.
It is clear that the same applies.

Effects of the Invention As described above, according to the present invention, the CGROM
Even if there are some bit error patterns in the
High-quality printing or display is possible without the need to replace CG or make major changes to conventional configurations.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is an explanatory diagram of the CG pattern for kanji, Fig. 3 is an explanatory diagram of the CGROM structure and bit error detection method, and Fig. 4 is an explanatory diagram of the CGROM structure and bit error detection method.
A configuration diagram of the CG pattern management table and CG pattern file in RAM, Figure 5 is an operation flow diagram for explaining the operation of the embodiment, and Figure 6 shows how the correct pattern corresponding to the error pattern is transferred from the main unit. It is an explanatory diagram for an example. In the figure, 1 is a main unit such as a CPU, 2 is a printer control device, 3 is a print driver and mechanism of the printer, 4 is an MPU for controlling the printer, 5 is a control memory, and 6 is a CG pattern check routine and correction. Output routine, 7 is CG ROM, 8
is RAM, 9 is the storage area for the CG pattern management table and CG pattern file in RAM,
Reference numeral 10 indicates a printing buffer.

Claims (1)

[Claims] 1. A kanji character generator used in a kanji printer or a kanji display device, etc., which includes a ROM in which kanji character patterns are stored, and a ROM that stores kanji character patterns;
Bit errors are detected for each character pattern in the ROM, the character pattern in which a bit error has been detected is corrected to the correct character pattern, and the corrected correct character pattern is sent along with its character code.
When the character pattern check means stored in RAM and the character code are input, the above
Correction to check the character code in RAM and output the character pattern if the corresponding character code exists, and if the corresponding character code does not exist in RAM, output the corresponding character pattern in the ROM. A character generator for kanji, characterized by comprising an output means. 2. The kanji character set forth in item 1 above, wherein the correct character pattern stored in the RAM is a character pattern with a bit error in the ROM corrected using an error detection code or an error correction code. character generator. 3. The character generator for kanji as set forth in item 1 above, wherein the correct character pattern stored in the RAM is one transferred from the kanji pattern table of the main unit.