JPH02134980A - Device for thinning stored facsimile code - Google Patents

Abstract

PURPOSE:To realize a thinning processing at high speed with a comparatively simple constitution by coding data while attaching a fill code to the data so that the title facsimile code can be a byte unit. CONSTITUTION:A coding circuit 1 codes the data while attaching the fill code to the data so that the code for one line can be the byte unit. Coded data in a code storing circuit 2 are successively sent to a line synchronizing code detection circuit 3 and a code thinning circuit 4 as a storage code 7, and the line synchronizing code detection circuit 3 searches a synchronous code in the data sequence of the storage code 7 and informs the code thinning circuit 4 of the detection of the code by a line synchronizing code detected signal 8 when the code is detected. The code thinning circuit 4 recognize the segment of the line of the storage code 7 from the signal 8, thins the storage code 7 according to a previously determined thinning ratio, and sends the thinned storage code 7 to a line control circuit 5 as a transmission code 9. Thus, either a byte data/ bit data conversion circuit or a data byte compression circuit becomes unnecessary, the intra-byte synchronizing code pattern detection circuit 3 can be used, and the structure of the device can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention transmits stored facsimile codes! In particular, the present invention relates to a device that handles accumulated data in byte units and thins out the accumulated codes by sub-scanning lines before transmitting them.

2. Description of the Related Art In conventional facsimile machines, documents to be transmitted are stored in a memory and transmitted at a designated time, or the same document is transmitted to a large number of recipients. In such a case, storing the document data as is in the memory would require a large capacity, so the data is compressed by encoding and then stored to make efficient use of the memory.

At this time, for example, if the line density of the image stored in memory is different from the degree or size of the image sent to the other machine, the stored codes may be thinned out by sub-scanning lines. may be sent. For example, the G3 facsimile option recommended by CCITT is 7,70/
The sub-scanning ll1A density of am is the standard sub-scanning line density 3.
It is widely used because it has better image quality than 850/am, but some equipment does not have it because it has an optional linear density. This kind of device is the other party's machine, and the original is 1.19
If the signal is accumulated at 1 mm and sent to such a partner device, the partner device will only be able to receive 3.85 Q/am and will not be able to communicate normally.

To solve this problem, at the time of communication, after decoding the data that has been scanned and once returning it to image data, thinning out the sub-scanning a density of the image data and making it into image data of the line density of the other machine, A device has been proposed that encodes the data and sends it to the other party's machine.

However, in this device, all lines of image data before thinning are decoded once.

A high-speed decoding circuit that operates simultaneously with the encoding circuit is required, and the i! In the example of the density value, it is necessary to decode two lines of accumulated encoded data while sending one line of encoded data to the other party's device.

This has the drawback of having a decoding circuit that is twice as fast as the encoding circuit, which increases the cost and the size of the device.

For this purpose, as shown in the present application and the joint application, a line synchronization code detection circuit and a code thinning circuit are provided,
By thinning the code data accumulated by adding a line synchronization code (hereinafter abbreviated as EOL) indicating the end of one line from EOL to the next EOL, the sub-scanning SR degree of the other machine can be reduced. A device for converting to linear density has been proposed.

Problems to be Solved by the Invention In the above-mentioned device, the stored codes are generally
The breaks in line data do not necessarily match the breaks in bytes. For example, in the one-dimensional coding method (Ml (coding method)) recommended by CCITT.

Is the white line code 29 bits on A4 size?
This is 3 bytes + 5 pits. However, recent data processing devices often use microcomputers or memory devices, and therefore data is handled in byte units.

Therefore, in the above-mentioned device, the line synchronization code detection circuit needs to convert the code data accumulated in bytes into a bit string, and then detect the [EOL] in the bit string. It is necessary to thin out the code data of , repack the data into pi 1- units, and output the data.

Figures 4 (a) to (d) show an example of the data at this time. (a) shows the Ml (code) of the A4 white line, and (b) shows the code in the byte degree. The state of each stored in the memory is shown.The line synchronization code detection circuit converts this code into a bit string string as shown in Fig. 4(c), and then searches for EOL. code data.

As shown in FIG. 4(C), the data is thinned out and the remaining data is generated again in units of byes 1 and up.

In this way, conventional devices first convert code data accumulated in bytes into a bit string, detect the EOL in the bit string, thin out the code data in the bit string, and convert the data again in byte units. A circuit for repacking and outputting is required, which has disadvantages in that the hardware and/or software increases, the cost of the device increases, and the processing speed decreases.

The present invention has been made to solve the problems inherent in the prior art, and therefore, an object of the present invention is to realize high-speed thinning processing of facsimile codes with a relatively simple configuration. An object of the present invention is to provide a new thinning device for facsimile codes.

Means for Solving the Problems In order to achieve the above object, the accumulated facsimile code thinning device according to the present invention employs an encoding method that performs encoding while adding fill codes to data so that the codes are in byte units. a circuit, a code storage circuit that stores code data thereof, a line synchronous code detection circuit that handles codes in high 1- units and searches for an EOL in the code data in the code storage circuit;
It consists of a code decimation circuit that handles and decimates codes in byte units.

Embodiment Next, a preferred embodiment of the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a facsimile code thinning device according to the present invention.

Referring to FIG. 1, reference numeral 1 indicates an encoding circuit, 2 a code storage circuit, 3 a line synchronization code detection circuit, 4 a code thinning circuit, and 5 a line control circuit.

The encoding circuit 1 encodes the data while adding a fill code to the data so that the code for line 1 becomes the unit of pie 1. Figure 2 (aJ ~ (0 month) is a diagram showing an example of the code outputted by the encoding circuit 1, and is an A4 size white line MH
This shows the case where the codes are consecutive. If the code for one line is not in byte units, a fill is inserted and added between the code and the EOL to make it into byte units, and then sent to the code storage circuit 2 as code 6.

The code storage circuit 2 stores the code 6 in byte units.

The code data in the code storage circuit 2 is sequentially sent as the stored code 7 to the line synchronization code detection circuit 3 and the code thinning circuit 4. The line synchronization code detection circuit 3 searches for the first EOL of the data string of the storage code 7, and when detecting HUL, notifies the code thinning circuit 4 of the detection of EOL using the line synchronization code detection signal 8. At this time, since the storage code 7 is generated in byte units, EOL always occurs in a data byte in a pattern as shown in FIG. For this purpose, the line synchronization code detection circuit 3 only needs to compare the data pattern in the storage code with a hide pattern of 130[,] in byte units.

The code thinning circuit 4 learns the line separation of the storage code 7 from the line synchronization code detection signal 8 sent from the line synchronization code detection circuit 3, thins out the storage code 7 according to a predetermined thinning rate, and transmits the transmission code 9. It is sent to the line control circuit 5 as a. Since the storage code ゛l is in byte units, the inter-symbol dividing circuit 4 continues the byte of the code of the line immediately after the thinned out line following the pie 1~ of the code of the line immediately before the thinned out line. This is sent to the line control circuit 5 as a transmission code 9, and output to the line.

In this embodiment, the MH code is used as the encoding method, but the encoding method is not limited to this. It goes without saying that any encoding method may be used, and any encoding method that has codes corresponding to fill and EOL can be widely applied.

In addition, in this embodiment, the encoding circuit 1 performs the processing of adding fill and byte packing of the code, but this is very suitable for a circuit other than the encoding circuit, and in this case, for example, a relay broadcasting device This method can also be applied to cases where encoded data is received from another device over a line, and the data is sent to multiple other devices.

Effects of the Invention Compared to conventional devices, line synchronization code detection and code thinning using the device of the present invention do not require a byte data to bit data conversion circuit or a data byte packing circuit, and EOL detection in a bit string is possible. Since a circuit for detecting an EOL pattern in a byte can be used instead of a circuit, high-speed processing can be expected, the structure of the device is simple, and its implementation is easy and inexpensive.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of an apparatus for thinning out accumulated facsimile codes according to the present invention. 100. Encoding circuit, 210. Code storage circuit, 31. . Line synchronization code detection circuit, 400. Code thinning circuit, 5
010 Line Control Circuit FIGS. 2(a) to 2(e) are diagrams showing an example of data generated by the encoding circuit 1. FIG. 3 is a diagram showing an EOL pattern occurring in a code. FIGS. 4(a) to 4(d) are diagrams showing code data of a conventional device.

Claims (1)

[Claims] A device that once stores facsimile codes and then transmits them, includes an encoding circuit that encodes the data while adding a fill code so that the code is in bytes, and stores the encoded data encoded by the encoding circuit. A code storage circuit, a line synchronous code detection circuit that handles codes in bytes and detects an EOL in code data in the code storage circuit, and a code thinning circuit that handles and thins out codes in bytes. A device for thinning out accumulated facsimile codes.