JPS60224380A - Facsimile data converting device - Google Patents

Abstract

PURPOSE:To reduce load of data conversion and decrease capacity of a memory circuit by converting facsimile data encoded by transmitter standard to run- length information once and accumulating, and encoding according to standard of the receiver. CONSTITUTION:When a facsimile data converting device is interposed between a transmitter and a receiver, it is decided whether the standard of facsimile data FD1 is to be converted to a standard determined on procedures using a decoding section 2 and an encoding section 4 at the time of sending out a digital command signal DCS. In the case of coincidence, facsimile data accumulated in a memory 1 are sent out as they are, and in the case of discordance, the data are converted to facsimile data FD2 by making necessary process and then sent out. By this way, detection of conversion point of black and white becomes possible in the encoding section 4 in communication between facsimile devices of different standards.

Description

[Detailed Description of the Invention] [Technical Field to which the Invention Pertains] The present invention relates to a facsimile data conversion device, and particularly to a facsimile data conversion device that facilitates communication between facsimile devices with different standards such as encoding method, minimum transmission time per line, and sub-scanning line density. The present invention relates to a facsimile data conversion device that enables facsimile data conversion.

[Prior art]

In facsimile communication, it is necessary for communication to have the same standards such as the encoding method of the transmitter and receiver, the minimum transmission time per line, and the sub-scanning line density, regardless of the line used. become.

In recent years, with the expansion of facsimile services, the need for communication between different types of devices has increased, and the need for standardization and
Although standardization is progressing, complete standards have not necessarily been unified. Therefore, methods have been attempted to enable communication between facsimile machines having different standards.

When the transmitter and receiver have different standards, the conventional facsimile data conversion device decodes the facsimile data encoded according to the transmitter standard and converts it into the original image signal with white and white binary signal forms. (hereinafter referred to as the original image signal), the image signal is once stored, and then encoded according to the receiver standard to perform data matching.

However, in such a conventional device, it is necessary to detect white and black changing point position information redundantly during decoding and encoding, which increases the load on signal processing. Another drawback is that the capacity of the placement circuit becomes large due to the storage of image signals for multiple lines.

[Purpose of the invention]

An object of the present invention is to reduce the load of data conversion and reduce the circuit capacity in communication between facsimile machines having different standards such as encoding methods, minimum l-line transmission times, and sub-scanning line densities. An object of the present invention is to provide a facsimile data conversion device.

[Structure of the invention]

The facsimile data conversion device of the present invention converts the first facsimile data into white and black when the first facsimile data encoded according to a predetermined standard does not match the standard of a facsimile device that receives the first facsimile data. a decoding means for converting the run-length information into run-length information indicating a run-length; a decoding means for storing the run-length information for a predetermined number of lines and reading it out in the order of storage; The facsimile apparatus includes an encoding means for encoding the data in accordance with the specifications of the apparatus and outputting the encoded data as second facsimile data.

[Explanation of Examples]

The present invention converts a part of facsimile data encoded according to a transmitter standard into run-length information and stores it, and encodes the run-length information according to a receiver standard. The purpose of this invention is to realize a facsimile data conversion device that enables communication.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention, and the facsimile data conversion apparatus includes memories 1 and 3, a decoding section 2, and an encoding section 4.

Memory 1 is a buffer memory for temporarily storing encoded facsimile data FDxi from the transmitter.

The decoding unit 2 decodes the facsimile data FD1 accumulated in the memory 1 when at least one of the standards such as the encoding method of the receiver, the minimum transmission time per line, and the sub-scanning line density differs from the standard of the transmitter. Each line is read out, converted into run length information LD indicating white and black run lengths, and run length information ILD corresponding to a predetermined number of lines is stored in the memory 3.

The memory 3 is a first-in first-out type buffer memory. Thereafter, the decoding unit 2 reads the facsimile data F from the memory 1 while monitoring the usage status of the memory 3.
Dl is read out, sequentially converted into run length information LD, and stored in the memory 3. However, the predetermined number of lines stored in the memory 3 at one time is set so as to absorb processing timing errors between the decoding section 2 and the encoding section 4, which will be described later, and to minimize mutual waiting time. Therefore, its capacity is much smaller than that of the conventional example described above, which stores image signals corresponding to a plurality of lines.

The encoding unit 4 continuously outputs run length information from the memory 3,
An encoding process is performed to match the facsimile data FDI with the standard determined in the control procedure before the 7-axis IJ data transmission between the transmitter and the receiver, which will be described later.
Convert to 7mm data FD2 and send. In this case, the encoding unit 4 can immediately recognize the positions of changing points of white and ripe from the run-length information LD and can perform encoding based on that information, thereby improving processing performance.

Next, the signal processing standard for matching the standards between the transmitter and receiver of the facsimile device is determined during a procedure between the transmitter and receiver before transmitting 7-axis data between the two. This procedure includes, for example, CCITT Recommendation T.30 as shown in FIG.

That is, after the transmission path between the transmitter and the receiver is connected, the receiver sends a digital identification signal DIS to the transmitting side, which indicates its own capabilities (encoding method, minimum transmission time per line, sub-scanning line density, etc.). do. When the transmitter has a standard identified by the digital identification signal DI8, it sends out a digital command signal DC8 in response to the standard to designate the encoding method, minimum transmission time for one line, etc.

Subsequently, a training check signal TCP is sent out, the training is confirmed through the modem, and it is checked whether the transmission line can be used at the specified transmission speed. after that,
After confirming the reception preparation confirmation signal CFH from the receiver, transmission of facsimile data is started.

When a facsimile data conversion device is interposed between the transmitter and the receiver, the standard of facsimile data FDI is procedurally determined using the decoder 2 and the encoder 4 at the time the digital command signal DO8 is sent. Determine whether to convert to the standard.

If the standard of facsimile data FD1 matches the procedural standard, facsimile data F stored in memory 1
Ds is sent as is, and if they do not match, it is converted into facsimile data FD2 by performing necessary processing and sent.

If the encoding method of the facsimile data FDI does not match the receiver standard, the facsimile data FDl is partially converted into jing length information LD by the decoding unit 2, and the encoding unit 4
Then, the run length information LD is directly encoded using an encoding method compatible with the receiver standard and converted into facsimile data FD2.

Even if the minimum transmission time for one line is different, after encoding in the encoding unit 4, a "0" bit is inserted as appropriate so that the minimum transmission time for one line conforms to the receiver standard.

If you want only the sub-scanning line density to match the receiver standard, for example, facsimile data FD1 should be 7.7 lines/mm.
If the sub-scanning line density of the receiver is 3.
85 lines/mm, and in this case, the encoding unit 4 reads out the run length information LD from the memory 3 by 1 line/mm.
Consistency can be achieved by performing this every two inches.

〔Effect of the invention〕

As described above, the facsimile data conversion device of the present invention converts the first facsimile data into two-length information in the decoding means instead of returning it to the original image signal, thereby changing the encoding method and the minimum transmission time per line. In communication between facsimile machines with different standards such as sub-scanning line density, the encoding means can immediately detect the change point of white and black, reducing the data conversion load and reducing the storage capacity. Improving facsimile communication services,
It has a remarkable effect on expanding its uses and making it more economical.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. In the figure, 2...decoding section, 3...
Memory, 4... Encoding section, FDI, FD!
...Facsimile data, LD...Run length information. FIG. 2 is a sequence diagram showing an example of application of the present invention. Figure 1 Figure 1

Claims (1)

[Claims] When the first facsimile data encoded according to a predetermined standard does not match the standard of a facsimile device that receives the first facsimile data, the first facsimile data is converted into run length information indicating white and black run lengths. a decoding means for converting, a storage means for storing a predetermined number of lines of the run length information and sequentially reading it out in the order in which it is stored; 1. A facsimile data conversion device comprising: encoding means for outputting facsimile data as facsimile data.