KR950004449B1 - Transmission method for chinese characters or graphics - Google Patents

Abstract

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Description

How to Fast Send Chinese Characters or Shapes Through the Computer Printer Port

1 is an adjoining diagram of a method for high speed transmission of Chinese characters or figures through a computer printer port in accordance with the present invention.

2 is a circuit diagram of an automatic detection circuit used in the present invention.

* Explanation of symbols for main parts of the drawings

1: Personal Computer 2: Chinese Character or Shape Generator

3: printer 11: printer port

U1, U2: data register U3, U4: comparator

U5, U6, U7: Flip-Flop U8: AND Gate

U9: NOR Gate.

The present invention relates to a method for transmitting Chinese characters or figures, and more particularly, to a method for high speed transmission of Chinese characters or figures through a computer printer port.

According to the prior art, if you want to add some application (data transfer) function to a personal computer, it is designed using a conventional industrial standard organization (ISA), a micro passage mechanism (MCA), or a system bus embedded in a personal computer or workstation. do. Among them, the system bus is adopted and used relatively much because it has the advantage of fast memory and withdrawal of data, but the system bus for data transfer is applied to Class A personal computer when applied. It is not possible to apply to class B personal computer because it has a drawback that cannot be applied to class C personal computer. Therefore, various problems occur in application, especially for notebook or portable personal computer, its structure and volume It is fundamentally unavailable in relation to

In order to solve the compatibility problem, a method of using a printer port of a computer as a data transmission interface has been proposed. Various computers (including notebook and portable) are all equipped with printer ports, and there are general standards for printer ports. The method of using a printer port as a transmission interface can be applied to, for example, a computer using a Fortune Centennial interface. This type of device is easy to install and maintain, and can also solve problems related to transfer to a notebook or portable personal computer. KEY CARD is an example.

However, the problem with using the computer's printer port as the transmission interface is that the transmission speed is too slow. In the case of small data transmission, the speed may be appropriate because the printing speed is slow, but in the case of a system processing a large amount of data, for example, a system that processes Chinese characters or ideographic characters, a slow speed may be appropriate. There are a number of fatal flaws that need improvement, but unfortunately we haven't seen the answer.

In view of the above problems in the high-speed transmission of data, especially Chinese characters or figures using a printer port, after analyzing, studying and classifying the characteristics of Chinese characters and figures, the present invention uses the printer port of a computer to generate Chinese characters or figures. Provides a method for high speed transmission. By means of the preferred embodiment, data relating to Chinese characters or graphics of one byte each time is transmitted to the Chinese characters or graphics generating apparatus connected to the printer port through the printer port on the personal computer.

According to a preferred embodiment of the present invention, the data is processed by the personal computer before being transferred to the data bus at the printer port. An automatic detection circuit is used to generate a control signal informing the Chinese character or figure generator that the data is ready for data retrieval so that the personal computer can transmit data to the Chinese character or figure generator connected to the printer port. Chinese character or figure generators transmit data using status signals. In order to minimize the amount of data before data is transmitted, the data is encoded by the Chinese character or figure generator in accordance with the continuous, heavy or tangible nature of the Chinese character or figure. After receiving the compressed data, the personal computer decrypts it and restores the original data. As a result, the Chinese character or figure generator can transfer data to a personal computer at high speed.

Various objects and features of the present invention will become more apparent from the following description with reference to the accompanying drawings.

Referring to FIG. 1, data of one byte (each byte is composed of 8 bits) is transmitted from the personal computer 1 to the Chinese character or figure generating apparatus 2 each time through the printer port 11. FIG. The data is descriptive or Chinese character code. However, after the data has been transferred to the data bus, the Chinese character or figure generator 2 does not yet recognize that the data has been transferred to the printer port 11. According to the conventional method, four control signals are controlled under software control. It should be used to inform the Chinese character or figure generating device 2 that the data can be generated and the generator can decode the data and use it to control the printer. However, such a system has a drawback that it takes about five times as long as the actual time required for data transmission only to transmit the control signal required in the conventional system. In other words, if it takes one unit of time to transmit data, two units of time are used to send a signal that the data is ready for transmission, and two units are used to read the status signal to determine whether or not the data output has been read. Takes time. Therefore, data transfer only takes 5 units of time.

On the other hand, in this class, the data of each byte is processed so that the data of each byte is different from the data of the front and rear bytes, and the Chinese character or figure that the data can be used by automatically generating a control signal using the automatic detection circuit shown in FIG. The generator 2 is notified. In the automatic detection circuit, the main function of the data register consisting of registers U1 and U2 is to store the transmitted data first. In a comparator composed of comparator circuits U3 and U4, the data is compared each time new data is transmitted. If the before and after data is the same, no further processing is done; otherwise, new data is stored in the registers U1 and U2. A time base clock generator circuit consisting of a set of flip flops (U5, U6, U7), an AND gate (U8), and a NOR gate (U9) generates a pulse and gives it to the data registers (U1, U2). Notify that new data comes to the external interface and is stored. The external interface then quickly retrieves data (within 375ns) to prevent other incoming data from being overwritten on existing data.

The system transmits data at high speed to the Chinese character or figure generator 2. However, it is very difficult to transfer figures from the Chinese character or figure generator 2 to the computer 1 because the data bus used at the printer port is generally one-way. In the present invention, the status signal should include sufficient information about the transmission of the data signal. Given that there are only five components for each status signal and the data that can be transmitted is limited, the characteristics of Chinese characters or figures are analyzed and statistically generated by the generator to encode the data according to the characteristics of the Chinese characters or figures. A unique way to make it was developed. The encoded data received at the personal computer is decrypted and restored to the original data. The five components of the status signal are BUSY, PE, SLCT and The code writing method is as follows.

Code writing uses relative values. That is, 10 and 10 are used as transmission lead codes, indicating that all data subsequently sent are relative values. = l, SLCTOUT = 0, PE = 0, A signal of = 0 and BUSY = 0 is transmitted twice in the lane code.

The personal computer 1 detects the lead cord in a poling manner. When reading data each time, the personal computer 1 sends one byte of data to the Chinese character or figure generating device 2 in the above manner, informing the device 2 that the data on the status signal line has already been recorded. do. This processing eliminates the need for the Chinese character or figure generator 2 to notify the personal computer 1 that data is already prepared on the status signal line. This means that the data transmission time interval is reduced by five factors. Therefore, the data on the signal line may be general data, for example, data relating to a character or character description, etc., and at the same time used for notification purposes, thereby saving transmission time. The Chinese character or figure generator 2 reads As soon as the notification is received, data of 3 bytes or less is sent out in order. The personal computer 1 accepts these already coded data and then decodes the code and recovers the original data for further processing. After sending the last data, the printer port 11 sends 1, NF signal = 1, SLCTOUT = *, PE = *, = *, BUSY = * is sent to indicate that data transfer is complete.

Analysis of the Chinese character or figure found that one parameter of each Chinese character or figure is always kept constant while the other parameter undergoes major changes. Therefore, you can design different coding methods to provide better performance.

In the handshaking mode as used in the first type of coding method mentioned above, the Chinese character or figure generator 2 sends 10 as a transmission lead code as follows.

ERROR = 1

SLCTOUT = 0

PE = 0

ACK = 0

BUSY = 0

Thereafter, the Chinese character or figure generating device 2 has (0, Nl), (0, N2)... (1, NF) Start transmission, where N1 * N2 + NF indicates the number of points skipped down to quickly display a character or figure.

In order to show the characteristics of the present invention, the transmission of one figure will be described in detail below (as an example of stroke of Chinese characters). If the figure is to be sent from the personal computer 1 to the Chinese character or figure generator 2 as a six-byte set of data, the description (the following numbers are all expressed in hexadecimal) is 00 3F 62 32 62 62. Suppose

Since any two consecutive bytes in each data transfer must be different, the value of the odd byte (i.e. 1,3.5.7 th byte) is added to 80 first and the even byte (i.e. 2, 4, 6, 8th) Byte). Thus, the 6-byte data is 00 BF 62 B2 62 E2.

As can be seen from the above data, each byte is different from the preceding and following bytes (the actual data is displayed from byte O to byte 6 and byte 7 is reserved for the odd conversion), so that the input data can be identified. The data transmitted from the Chinese character or figure generating device 2 to the personal computer 1 has the property that Chinese characters or figures generally increase or feel continually.

Assume

In conventional transmission schemes, the number of bits required depends on the actual coordinates representing the figure. For example, if the coordinate is (10,026), 11 bits are needed to display the coordinates, but since the status signal on the printer port 11 has only 5 bits, three transmissions are required to display the coordinates. In other words, two other handshakings are required and the speed is about one fifth of the original speed.

However, according to the present invention, 5 bits can be displayed. For the above example, the coded data (which adopts the first type of code writing method) is 10,10,00,0F.0B, 05,07,03,0A, 04,09 ..... here The first two "10" are read codes and the third byte (00) indicates that X is starting at 00, "0F" indicates that Y1 is 15, and "0B" indicates Y2 = 15 + 11 = 26 "5" indicates that Y3 = 26 + 5 = 31. "X _n" would be better if only the difference between the Y _n and Y _{n + l} transport because the "X _{n + 1"} is congestion (+1). If the change in data value is large, write the code in the second kind.

For example, if a1 (00,100) ₁₀ , a2 (00,3375) _l0, "a1" could be encoded as l0,0F, 06, lA and "a2" would be encoded as 10,0F, 0F.0F, 10 Can be. If you multiply the data of a1 (0F) by 06, it is 90 _10. If you add the increment (0A), the sum is 100 _{100. If you add} the data of 0 and multiply 0F by 0F, and add the increment (0), the sum is 3375.

In this way, a large amount of data can be greatly reduced, and the purpose of high-speed transmission of Chinese characters or figures in the handshaking method can be achieved.

As described above, the method for high-speed transmission of Chinese characters or figures through a computer printer port according to the present invention includes descriptions of Chinese characters or figures every byte through the printer port, and Chinese characters or figures connected to the printer port in sequence. It relates to the transmission to the generator. Before the data is transferred from the personal computer to the data bus of the printer port, each byte data is processed to be different from the data before and after it. The automatic detection circuit is used to generate a control signal to notify the Chinese character or figure generating device that the data is already ready and can be read, and the computer sends the data to the Chinese character or figure generating device connected to the printer port. Enable high speed transmission.

On the other hand, the Chinese character or figure generating apparatus also analyzes and statistics using the characteristics of the Chinese character or figure, codes the data, and transmits the data to the personal computer using the status signal. After receiving the data, the personal computer decrypts the code and restores the original data. In this way, the Chinese character or figure generator quickly transfers the data to the personal computer.

Claims (4)

In a method of transferring a Chinese character or figure, in which a description and code data of one byte of Chinese character or figure are transmitted to a Chinese character or figure generating device connected to the printer port each time through a printer port of a computer. Before sending to the data bus of the printer port, the data is processed in advance so that each set of data is different, and the automatic detection circuit generates a control signal to notify the Chinese character or figure generator that the data is already ready and can be read. Is transmitted to a Chinese character or figure generating device connected to the printer port in succession, and the Chinese character or figure generating device analyzes the data, prepares a code of the data by analyzing the data, and then uses a status signal. To a computer, and a personal computer After receiving the data, it decodes the received code and recovers the original data again so that the Chinese character or figure generator can transmit the character to the personal computer at high speed. Way. 2. The apparatus of claim 1, wherein the automatic detection circuit comprises a time base clock generation circuit comprising a comparator and a set of flip-flops of a data register, the data register storing first transmitted data, the comparator always being a data register. Compare the stored data with the introduction data on the data bus of the computer printer port, and if the introduction data is different from that stored in the data register, one pulse is generated from the time base clock generation circuit and given to the data register to store the data and the new data. Notifying the external interface to introduce and save, the Chinese character type through the computer printer port, characterized in that the external interface retrieves the data within a certain time and prevents other data introduced later from being overwritten on the previous data. A method for high-speed transmission the shape. The method according to claim 1 or 2, Five status signals,, PE, BUSY and SLCTOUT are used for writing the code, where the relative value bases 10 and 10, ie ERROR = 1, SLCTOUT = 0. PE = 0.ACK = 0 and BUSY- = 0 are sent twice in succession as lead code and code is written. When the personal computer detects the lead code by a pulling method and finds the code, the personal computer sends one byte of data to the Chinese character or figure generator, indicating that the data on the status signal line has already been read. (This data is also a coded or textual representation to minimize transmission time.) Then the Chinese character or graphic generator sends out the next data in turn and the personal computer receives the coded data. After decoding the code and recovering the original data, it is processed further and the Chinese character or figure generator is 1, NF, = 1, SLCTOUT = *, PE = *, A method of high speed transmission of Chinese characters or figures through a computer printer port, characterized by sending = *, BUSY = * to indicate the end of the transmission. The method of claim 1 or 2, wherein the code writing of the data can be made by adopting another code writing method using the same handshaking method. = 1, SLCTOUT = 0, PE = 0, Send 0, Nl, 0, N2 · 1, NF as an efficient way to represent each character type after sending = 0, BUSY = 0 as lead code, where N1 * N2 + NF is the number of points to skip down A method of high speed transmission of Chinese characters or figures through a computer printer port, characterized in that.