JPS6029827A - Check system for undefined character code - Google Patents

Abstract

PURPOSE:To facilitate and simplify the detection processing of an undefined character code by adding an undefined character code detecting circuit to an image processor. CONSTITUTION:A character code is transmitted from a host computer to the image processor 10 which consists of a microprocessor unit (MPU) 11, etc., and is provided with the undefined character code detecting circuit 16 to process character data and also check the undefined character code. The MPU11 extracts a character code CC from the character data CD, and an ddress register 13 uses it as an address to read a character pattern CP out of a character pattern generatng memory 12 and transfer to a register 14. When the corresponding character pattern is not found, the undefined character pattern is supplied as it is and detected by a detecting circuit 16. Once one character pattern CP is read out of the register 14 a decision on it and storage to a video memory 15 are performed at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION (11) Technical Field of the Invention The present invention relates to an undefined character code checking method that can easily detect undefined character codes transmitted to an image processing apparatus.

(2) Background of the Technology - In image communication, it is widely practiced to transmit character data from a solid device to each terminal device via a computer network for display or printout.

At this time, some of the character data transmitted from the postcomputer of the solid device may contain characters that are not stored in the character pattern generation memory provided in the receiving terminal device.

Characters that are not stored in the character pattern generation memory are called undefined character codes, and the detection and processing of these undefined character codes is always a problem for the image processing device installed in the terminal device. becomes.

(3) Prior art and problems Conventionally, in order to identify whether or not a transmitted character code is an undefined character code, a character pattern table is separately provided in the firmware within the image processing device, and the character I was exploring the pattern table.

However, such identification methods require a character pattern table separate from the character pattern generation memory, and read from the character pattern memory after searching in the character pattern table, making character data processing complicated and slow. There was a problem that speeding up was hindered.

(4) Purpose of the Invention The purpose of the present invention is to enable the detection of undefined character codes easily with a simple configuration that does not require a separate character pattern table, and to read out character patterns and store them in an image memory. An object of the present invention is to provide a method for checking undefined character codes in an image processing apparatus that can quickly perform original character data processing.

(5) Structure of the Invention In order to achieve the above object, the present invention provides a character pattern generation memory, an address register for the character pattern generation memory, and a readout register for storing the character pattern read from the character pattern generation memory. a register, an image memory for storing the character pattern read from the reading register in a predetermined location, and a predetermined character pattern corresponding to the character code from the received character data including the character code, using the character code as an address. In a method for checking an undefined character code in an image processing apparatus having a microprocessor unit that reads out a character pattern from a character pattern generation memory, stores it in a predetermined location of the image memory, and checks for an undefined character code, the undefined character code is read from the successive register.

Receive character pattern data for each character that is issued,
An undefined character code detection circuit is provided which generates a detection signal indicating whether the character pattern is a regular character pattern corresponding to a character code or includes an undefined character code and supplies it to the microprocessor unit, The processor unit is characterized in that when receiving a detection signal from the undefined character code detection circuit, the processor unit checks whether the received character code is an undefined character code.

(6) Examples of the invention An embodiment of the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 shows a block diagram of the undefined character code checking method of the present invention.

In FIG. 1, 10 is an image processing device that processes character data and checks undefined character codes, and 20 is a host computer that sends character codes to this image processing device 1o. Characters that are subject to character codes include Japanese and English texts, numbers, punctuation marks, various parentheses, and other characters and symbols necessary to create sentences. This is called a character code.

Among the components of the image processing device 10, 11 is a microprocessor unit (hereinafter referred to as MPU) that performs character data processing operations such as reading and storing character patterns; 12 is a character pattern generation memory in which various character patterns are stored; 13 is an address register for the character pattern generation memory 12; 14 is a shift register type read register for temporarily storing one character pattern read from the character pattern generation memory 12; 15 is a read register 1;
4 is an image memory in which the read character pattern is written to a predetermined location; 16 is an undefined character code detection circuit (details will be explained in FIG. 3); and T is a timing signal.

Although not shown in the figure, from MPU II, 12
Various control signals including a timing signal T are supplied to each of the 16 elements.

Next, the operation shown in FIG. 1 will be explained.

When the host computer 20 sends the character data CD including the address where the character code is stored to the MPU II of the image processing device 10, the MPU 11 extracts the character code CC from the character data CD and stores it in the address register 13. send.

Address register 13 uses character code CC as an address, reads character pattern CP corresponding to character code CC from character pattern generation memory 12, and reads register 1
Transfer to 4.

When the character pattern corresponding to the addressed character code CC exists, the character pattern generation memory 12 outputs the character pattern, but when the character pattern corresponding to the addressed character code CC does not exist, e.g. An undefined character pattern in which all bits are rOJ is output and transferred to the read register 14.

When the transfer of the character pattern CP for one character to the read register 14 is completed, the MPU II reads each bit from the read register 14, stores the character pattern at the address specified by the character data CD, and sets each bit as an undefined character. The signal is supplied to the code detection circuit 16.

The undefined character code detection circuit i6, as shown in FIG. 2(A), is composed of a JK flip-flop, and the character pattern CP is supplied one bit at a time from the reading register 14 to the J terminal which is an input terminal. Since the K terminal is fixed at "0", the relationship between the input (J terminal) and the output (Q terminal) and the bit status are as shown in Figure 2 (B).
”, the output retains the previous bit status,
When the input is "1", the output is "1" regardless of the previous bit status. Therefore, if a series of input bits supplied to the J terminal are all "0", "0" is output to the output terminal Q, and even if one of the series of input bits is "0", "0" is output to the output terminal Q.
If a ``1'' is present, the final output will always be a ``1''.

By the way, in the character pattern CP transferred to the read register 14, except for the blank code consisting of rOJ bits, all other character patterns are composed of at least one "1" bit.
” bit. □Therefore, when the supply of one character pattern bit from the read register 14 to the undefined code detection circuit 16 is completed, the undefined code detection circuit 16
When the output of , that is, the detection signal DS is "1", the character turn read from the successive register is determined to be a regular character pattern corresponding to the character code CC, and the detection signal DS is "1". is determined to be either a blank code or an undefined character code. The undefined character code detection circuit 16 sends this detection signal DS to the MPU.
Send to II. When the detection of one character pattern is completed,
The output Q is reset to the initial state of rOJ by the initialization signal R from the MPU 11.

The MPU II performs undefined character code detection processing based on the detection signal DS from the undefined character code detection circuit 16.

FIG. 3 shows the procedure for undefined character code detection firmware in MPU II.

In step S1, the character pattern CP corresponding to the character code CC for one predetermined character is read out from the character pattern generation memory 12 from the character data CD transmitted from the host computer 20 described above, and is stored in the image memory 15. Detection signal DS from definition code detection circuit 16
An operation is performed that produces the output of .

In step S2, the detection signal 4Ds output from the unused character code detection circuit 16 is "1" at the time when the successive output of character patterns CP for one character from the reading register 14 is completed.
It is determined whether it is "cart 0".

When it is "1", it is determined that the read character pattern CP is a regular character pattern corresponding to the character code CC, and the process moves to step S4 to execute a normal processing sequence.

When it is "0", it is determined that the read character pattern corresponds to an undefined code or a blank code, and the process moves to step S3.

In step S3, by identifying the character code,
It is determined whether the read character pattern corresponds to a blank code. If the character code is a blank code, the successive character patterns of all rOJ indicate regular blank characters, so the process moves to step s4 and a normal processing sequence is executed.

When the character code is not a blank code, it is determined that the read character pattern corresponds to an undefined character code that does not exist in the character pattern generation memory 12, and the process moves to step s5, where an undefined character code detection processing sequence is performed. Execute.

In the normal processing sequence of step S4, character patterns for the next character code CC are successively read out from the character pattern generation memory 12 and stored in the image memory 15, and the detection of undefined codes is repeated.

In the undefined character code detection processing sequence of step S5, a processing sequence for undefined character codes similar to the conventional one, such as replacement processing with another character, is performed.

According to the undefined code detection method described above, when one character pattern CP is read out from the reading register 14, it is simultaneously determined whether or not the character pattern is legal and stored in the image memory 15. Therefore, if the character pattern is determined to be regular, the next character code can be processed immediately, so the character pattern for the character code CC can be read out and stored in the image memory quickly. You will be killed.

When the transmitted character code is an undefined character code, the undefined character code detection processing sequence is executed as before, but since the probability that the transmitted character code is an undefined character code is generally small, The normal processing sequence is executed almost continuously, enabling high-speed processing.

(7) Effects of the Invention According to the undefined character code checking method of the present invention, a separate character pattern table unlike the conventional one is not required by simply adding an undefined character code detection circuit with a simple configuration. , the undefined character code detection process can be performed simply and easily, and the overall configuration of the image processing device is also simplified.

In addition, when the character pattern corresponding to the character code is read out and stored in the image memory, the presence or absence of an undefined character code is detected at the same time. Since the processing can be executed, character data can be processed at high speed.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is an explanatory diagram of an undefined code detection circuit of the present invention, and FIG. 3 is a flowchart showing an operation procedure for detecting an undefined code of the present invention. 10... Image processing device, 11... Old microprocessor unit (MPU), 12... Character pattern start memory, I3... Address register, 14... ...Read register, 15...
...Image memory, 16...Undefined code detection circuit, 2o old...Post computer. CD...Character data, cc...Character code, CP...Character pattern, DS...
・Detection signal for undefined character code, T...
Timing signal, R...Initialization signal. Patent applicant Fujitsu Ltd.

Claims (1)

[Claims] A character pattern generation memory, an address register for the character pattern generation memory, a read register for storing the character pattern read from the character pattern generation memory, and a character pattern read from the read register to be stored at a predetermined location. a predetermined character pattern corresponding to the character code from the received character data including the character code is read from the character pattern generation memory and stored in a predetermined location of the image memory and undefined. In the checker method for undefined character codes in an image processing apparatus having a microprocessor unit that checks character codes, character pattern data for each character successively outputted from the read register is received, and the character pattern corresponds to the character code. An undefined character code detection circuit is provided which generates a detection signal indicating whether the character pattern is a regular character pattern or includes an undefined character code and supplies it to the microprocessor unit, and the microprocessor unit detects the undefined character code. 1. A method for checking an undefined character code in an image processing apparatus, characterized in that when a detection signal is received from a detection circuit, it is checked whether or not a received character code is an undefined character code.