JPS59189751A - Data transmission control system - Google Patents

Abstract

PURPOSE:To reduce the load on a CPU to transmit compressed and non-compressed image data by providing a compression/non-compression discriminating means on a communication controller CCU or providing this means in accordance with the indication from the CPU. CONSTITUTION:Image data in a memory 1 is sent to a CCU 4 by the control of a CPU 2. The CCU 4 transfers received data to an attachment LA 7 corresponding to a line, through which data should be transmitted, as it is. In the LA 7, the start part of image data is read in a data attribute discriminating part 5 to discriminate whether data is compressed or non-compressed. If it is discriminated that data following the start part is non-compressed data, the compression processing of MH, MR, or the like is performed in a compression processing part 6, and data is sent to a communication control part 8. Meanwhile, if it is discriminated that data is compressed data, this data is sent to the communication control part 8 directly. Next, data is sent to a communication line 10 through a MODEM 9 to which the LA 7 corresponds, and data is received by a facsimile in the transmission destination.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention is applicable to the transmission of image information from a computer or the like to a facsimile or the like via a communication line.

The present invention relates to a method for efficiently compressing and encoding image information G and transmitting the same.

(2) Prior art and problems In general, nine characters, etc. are transmitted from a computer etc. via a communication line,
When sending by facsimile, etc., the two-character code must be converted into image data. At this time, since the image data has a huge amount of information, the transmitting side performs compression processing and sends it to nine lines to reduce the amount of information to be transmitted.

Conventionally, the character image conversion and the compression encoding process were performed using CF.
Communication control unit (CCU) connected to 'U or computer
The compressed image data was sent to two lines using a common part of the CPU and CCU, but since the load on the common part of the CPU and CCU was large, the data was transmitted separately to each line.

The compression process and line control were performed to reduce the load.

When compressed image data is input and stored, it is stored as is to save storage capacity.

However, when transmitting this compressed image data, a new decoding processing section must be installed or a device dedicated to compressed data must be added.

In addition, in order to combine and output characters, etc. and compressed image data that has been stored to save storage data capacity, the 5 characters, etc. must undergo the character/image conversion, and the compressed image data can be converted to CPtJ or A CCLI common part and decompression processing part are provided, and after decoding compressed data into original data, the other parts are combined.

The two combined data could not be sent unless it was sent to the compression processing section of each line and outputted to the line.

For this reason, the basic system change was to perform the wasteful process of converting the compressed image data back to the original data and then converting it back to the original compressed image data, and then adding decompression processing to the basic part of the CPU or CCU. There was a drawback to doing it as well.

(3) Purpose of the Invention The present invention solves the above-mentioned drawbacks and improves data compression/compression for computers.
The purpose is to reduce the decompression processing load and the data storage capacity.

(4) Structure of the invention The object of the invention is to provide a system having a communication control device connectable to a plurality of communication lines, which includes a compression encoding means, a nine-line control means, and a data attribute determination means. When data is transferred to the communication control device, the data is determined by the data attribute determination means, and if the data is uncompressed data, it is compressed by the compression means, and if it is compressed data, it is left as it is by the line control means. A data transmission control method characterized in that data is transmitted via 7 is achieved.

(5) Examples of the invention The present invention will be described in detail below with reference to the drawings.

FIG. 1 is an overall block diagram showing one embodiment of the present invention.

In the figure, 1 is memory, 2 is central processing unit (CPU)
, 3 is a channel control unit, 4 is a CCU (communication control unit)
, 5 is a data attribute determination unit, 6 is a compression processing unit, and 7 is LA (
line-compatible axotiment).

8 is a communication control unit, 9 is a modem (M), and 10 is a line.

FIG. 2 is a detailed block diagram showing one embodiment of the present invention.

In the figure, 21 is a common control unit, 22 is character code data, 23 is image data, 24 is a code buffer, 2
5 is a character pattern, 26 is a sending number, and 27 is original image data.

First, the image data in the memory 1 is sent to the C0U4 via the channel control section 3 under the control of the central processing unit v2. Next, in the CCU 4, the L
Do not pass the data to Yatsu as received (without making any changes). In the LA 7, the data attribute determining unit 5 first reads the beginning of the image data and determines whether it is compressed or not based on the read content. If the data following the head part is determined to be uncompressed data, the compression processing section 6 performs compression processing such as MH or MR and sends it to the communication control section 8. On the other hand, if the data following the beginning is compressed data.

The data is directly sent to the communication control unit 8 without passing through the compression processing unit 6. Next, data is sent from the communication control section 8 to the communication line 1O via the 1 modem 9 supported by the LA 7, and the data is received by the destination facsimile.

Further, to explain in detail with reference to FIG. 2, from CPU2 to C
The data sent to the CU 4 is character code data 22. such as JIS code that corresponds to a single character pattern. Image data, which is either original image data or compressed image data3. These data are converted into compressed image data by the CCU 4 and output to the line 10 via the 7° modem 9.

First, the data transferred to the CCU 4 is character 2r-) data 2.
Case 2 will be explained.

The character code data 22 is sent from the CPU 2 to the CCU 4.

The common control unit of the CCU 4 indexes the character pattern 25 on CC[J4 in the code buffer 24 for the sent character code data, and converts the 9 character code data into a dot pattern. This data is input to the sending buffer 26 corresponding to the sending line 10 and accumulated line by line. This converts one character code data into one line of image data.

The sending buffer 26 repeats this process for the number of lines to be sent.
When the image data input is completed, the LA corresponding to each line
Transfer data to 7.

In I and Δ7, the attributes of the data input by the data attribute determination unit 5 are determined by the image attribute code added to the beginning of the data or by the information instructed by the CPU 2 at the time of data transfer. or uncompressed code. This image attribute-7-code or CP tJ
The contents of the t-line water information from 2 to 2 are composed of compressed or uncompressed code 1 pixel density, data length, U, etc.

In this case (character code transfer), the transferred data is.

Since it is uncompressed data, the compression processing unit 6 performs MH.

The image buffer 27 is subjected to compression encoding processing such as MR.
The compressed data is inputted to the input terminal and sent to the line 10 via the modem 9.

Next, if the transferred data is image data 23.

CI) Image data is sent from U 2 to CCU 4, and it is sent directly to the output buffer 2G corresponding to line 1O, and when it is finished manually, L A 7, which transfers the data to LΔ7 corresponding to each line, determines the attributes of the data. The unit 5 determines whether the data is compressed or not, and when compressed data is input, it is input as is, and when uncompressed data is input, it is subjected to cough compression processing and manually inputted to the image buffer 27.

Output to line 10 via modem 9.

(6) According to the present invention, as described in detail, means for determining compression or non-compression is provided on the CCU.

By providing a means for determining compression/non-compression based on instructions from the central processing unit, the load on the CPU can be reduced and compression/non-compression can be performed.
Can transmit uncompressed image data. The image data can be stored in a compressed state, reducing storage capacity and eliminating the need for compression processing on the CCU (and improving processing efficiency).

be.

FIG. 2 is a detailed block diagram showing one embodiment of the present invention.

Explanation of symbols, 1 is memory, 2 is central processing unit (CPU)
, 3 is a channel control unit, 4 is a CC1J (communication control device), 5 is a data attribute determination unit, 6 is a compression processing unit, 7 is an LA
(Line-enabled acknowledgment).

8 is a communication control unit, 9 is a modem (M), and 21 is a common control unit.

24

Claims (1)

[Claims] In a system having a communication control device connectable to a plurality of communication lines, a compression encoding means, a three-line control means, and a data attribute determination means are provided, and data is transferred from a central processing unit to the communication control device. If the data is uncompressed data, the data is determined by the attribute determining means, and when the data is uncompressed data, it is compressed by the compressing means, and when it is compressed data, the data is transmitted as is via the line control means. Data transmission control method.