JPS58156254A - Transmitting method of high-speed image - Google Patents

Abstract

PURPOSE:To transmit an image data through a smiple circuit and at a high speed, by adding a high-speed image transmitting buffer register and a control part to a low-speed interface control circuit. CONSTITUTION:A transmitting circuit is provided with a low-speed interface part LI of 4-wire type and a high-speed interface part HI of 2-wire type. A driver D and a receiver R transmit and receive the control data and the image data to/from the interface parts LI and HI. A buffer control part is provided at a circuit control part to control a buffer consisting of a shift register, etc. Then the circuit control part stores temporarily the parallel-serial converted image data. The part LI transmits characters, etc. by the fully double communication; while the part HI transmits the image data by the semidouble communication respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a communication system that allows high-speed image data to be transmitted in a simple manner.

(Background Art) As line speeds increase, many line control methods require a microcomputer or sequence controller dedicated to line control, resulting in a larger circuit configuration than low-speed interface control. In other words, conventional image processing devices and systems have to transmit and receive large amounts of data at high speed due to the huge amount of data involved.
Since the transmission procedure is transmitted over the same high-speed line, a circuit for controlling the high-speed transmission procedure is required, and the device is therefore complicated and large-scale.

(Problems to be solved by the invention) The present invention aims to improve the above-mentioned drawbacks of the conventional technology, and adds a buffer register and a control section for high-speed image transmission to a low-speed interface control circuit, thereby realizing high-speed image data transmission with a simple circuit. and
This will be explained below with reference to the drawings.

(Structure and operation of the invention) FIG. 1 is a block diagram of a transmission system according to the invention, which has a low-speed interface section LI and a high-speed interface section HI, and normal transmission procedures are performed by the low-speed interface section LI.

When transmitting and receiving image data, the low-speed interface section is set to image data transmitting and receiving mode, and the high-speed interface section transmits and receives image data.

In Figure 1, a 4-wire low-speed interface section and a
A transmission line is constructed from a wire-type high-speed interface section, and the transmission speed of the low-speed interface section is 1200 bi
ts/sec, and that of the high-speed interface part is about I M bits/sec. The driver D and the receiver R are means for transmitting and receiving control data and image data to and from the low-speed interface section and the high-speed interface section, and are controlled by the line control section. A buffer control unit is provided in the line control unit, which controls a buffer composed of a shift register with a predetermined block length, and performs parallel-to-serial conversion (P→S conversion) or serial-to-parallel (S-+P) conversion. Accumulate the data once.

Figure 2 shows the relationship between the transmitting side and the receiving side configured in this way (
This is a time chart showing the flow of signals exchanged over a distance (usually about 100 meters), in which the low-speed interface section transmits ordinary characters and other data through full-duplex communication, and the high-speed interface section transmits image data through half-duplex communication.

Now, on the transmitting side, after storing the image data in the buffer, it transmits a code requesting the setting of the image mode to the receiving side, and waits for the receiving side to complete the setting. When the reception side completes reception preparations, it marks the transmission line. After confirming this mark status, the transmitting side starts transmitting the fixed-length image data stored in the buffer, and the receiving side stores this image data in the buffer from the start of reception, and is ready to receive the next image data. Spaces the transmission line until completion, indicating reception is in progress. When preparations for reception of the next image data are completed, the transmission line is set to a marked state to notify the transmission side that reception has been completed. If reception is not performed normally, the space state continues for a predetermined period of time or more. This may be detected on the transmitting side and the image data may be retransmitted. When the image data has been transmitted to the last line, the transmitting side takes advantage of the fact that the transmission line is marked, cancels the image mode setting, and transmits normal characters and other data through the low-speed interface.

According to the present invention, conventional high-speed interfaces cannot transmit image data without high-speed processing and reading and controlling specific characters and codes that confirm the reception of data. The separation procedure was complicated, but since the low-speed ink face controls the markings and spaces, image data can be transmitted at high speed with a simple circuit.

(Effects of the Invention) The present invention can be widely used in image processing systems and image data transmission of devices. Although the above example shows an example of a fixed block length, it is also possible to transmit an arbitrary block length by specifying the block length at the low-speed interface section.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a time chart showing the transmission procedure of this embodiment. Ll...Low speed interface HI...
・High-speed interface patent applicant Oki Electric Industry Co., Ltd. Patent application agent Megumi Yamamoto −

Claims (1)

[Claims] A high-speed line for transmitting image data and a separate low-speed line are provided between the transmitting side and the receiving side that require high-speed image data transmission, and the low-speed line transmits transmission control signals for the high-speed line. A high-speed image data transmission method characterized in that the image data is transmitted over a high-speed line according to the transmission control.