JPS6340475A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To shorten an unnecessary transmission time by selecting either code of an MR encoding system or an MH encoding system to be transmitted and transmitting according to the contents of an initial identification signal (DIS) sent from a remote device. CONSTITUTION:Picture data outputted from a reading circuit 1 is MR coded by the (modified read (MR) encoding circuit 2 and stored in a picture memory 3. All the data is stored, thereafter, each one line of the data in the picture memory 3 is read, fed to an MR decoding circuit 4, the MR code is decoded to return to the original picture data. Then, the picture data of the one line is sequentially MH encoded by a modified Haffman (MH) encoding circuit 5 and stored in a picture memory 6. After all the data is stored in the picture memory 6, a control circuit 7 calls the remote device to which the data is transmitted to communicate therewith and when the contents of a DIS signal to be sent from the remote device are display that only the MH code is permitted to be received, a gate circuit 10 is controlled in such a manner that the contents of the picture memory 6 in which the MH encoded picture data is stored are fed to the remote device connected to a line via a modem 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a facsimile machine, and particularly to a facsimile machine having a sequential reporting function.

[Conventional technology]

Conventionally, when a network is formed between Group 3 (G3) facsimile machines in accordance with Recommendations T and 4 of the International Telegraph and Telephone Confederation (CCI T'r) and sequential broadcasting is performed, the first method is as follows: Once the central device is
There is a method in which the image data of a document to be transmitted is stored in encoded form, and then the stored image data is transmitted by sequentially communicating with the recipient. Q3 facsimile machines specified in CeITT T, 4 include those that only have a modified Huffman (MH) code dead-power processing function,
There is an apparatus that also has a processing function of the modified read (MR) code dead rate type, which is a code dead rate type with higher efficiency than the t'=kani of the MH encoding system. When these two types of devices coexist in a network, the central device always stores image data encoded using the MHH encoding method, which is m of the T.4 recommendation. A second method is to store raw image data without any encoding at the time of storage in the center device, encode it with an encoding method compatible with the destination device, and then transmit it. ing.

[Problem that the invention seeks to solve]

In the first method in the prior art described above, if there is a device in the other party that can only receive MH codes, only MH codes are stored when image data is stored in the center device. Therefore, even if most of the other devices have the ability to receive data using the MR code, the data will be transmitted using the MH code, which has the drawback of lowering communication efficiency and lengthening the transmission time accordingly. (The extent to which the transmission time becomes longer varies depending on the data content, but it is about 1.5 to 3 times longer than when using an MR code.) Furthermore, the second method in the prior art has the drawbacks of the first method. However, the amount of data when storing raw image data is approximately 15 to 20 times larger than the amount of data when MR encoding is performed.
Since the amount is 6 to 10 times as large as that in the case of MHH encoding, the required area of the image memory also increases by that amount, resulting in a disadvantage that the apparatus becomes large and expensive.

The object of the present invention is to once decode the data that has been stored after being encoded using the MR encoding method, and then to encode and store the data using the MH encoding method, and to generate an initial identification (DID) signal sent from the other device. By selecting and transmitting the code in accordance with the content of the message, unnecessary transmission time, which is a disadvantage of the first method of the prior art, can be shortened, and the disadvantage of the second method can be reduced. without increasing the image memory area.
An object of the present invention is to provide a facsimile device that can perform sequential reporting.

[Means for solving problems]

The device of the present invention includes first and second encoding circuits that encode image data using the A4R encoding method and the MHH encoding method, respectively, and a decoding circuit that decodes the encoded image data. The first one stores each encoded image data.
and a second image data, the image data of the transmission original is encoded by the power of the first and second encoding circuits, and
The image data stored in the image memory of the first image memory, further read out the contents of the first image memory, and decoded by the decoding circuit is encoded by the other one of the first and second encoding circuits, and the image data is encoded by the other one of the first and second encoding circuits. A control circuit is provided for storing image data in the image memory and for controlling the image data to be read out from one of the first and second image memories and transmitted in response to a signal indicating the reception capability of the other device.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

In the figure, image data generated from a reading circuit 1 is MR encoded by an MR encoding circuit 2 and stored in an image memory 3. After all data is accumulated, the data in image memory 3 is
The data is read out line by line and sent to the M-decoding circuit 4, where it is decoded by the MR code system and restored to the original image data. Then, the image data for each line is sequentially MH encoded by the MHH encoding circuit 5 and stored in the image memory 6. And picture memory 6
After accumulating all the data, the control circuit 7 calls the partner device to which data should be sent and performs communication, and if the content of the initial identification (DI8) signal sent from the partner device is MH
If it indicates that only codes can be received, the contents of the image memory 6 in which MHH encoded image data is stored are sent via the modem 8 to the other party's device connected to the line. Controls the gate circuit 10. That is, the control circuit 7 sends a high level pulse to the gate circuit 10 so that the data read from the image memory 6 is sent from the AND gate 14 to the modem 8, and also causes the inverter 12 to generate a low level pulse. data transmission from the AND gate 13 is prohibited. Also, D sent from the other device
If the IS signal indicates that the MR code can be received,
The control circuit 187 controls the gate circuit 1 to send the contents of the image memory 3 in which MR encoded image data is stored to the other device.
o control. That is, the control circuit 7 is at the low level 6
Send one pulse to the gate circuit 10 to cause the data read from the image memory 3 to be sent from the AND gate 13 to the modem 8,
Data transmission of the AND gate 14 is prohibited. In this embodiment, for the sake of simplicity of explanation, the MRR encoding circuit 2. M.R.R.
Encoding circuit 4. Although the MHH encoding circuit 5 and MHH encoding circuit 5 have been described as individual circuits, and have been described as MRR encoding, in a facsimile machine having an MR encoding system processing function, the MH
In most cases, an encoding circuit and a decoding circuit are provided for the double-edged type of MR, and both circuits are integrated into one (encoding/decoding circuit 11 in FIG. 1).

Even in such a case, in this embodiment, both MH and MR encoding are not performed at the same time, so each circuit can be used as is.

Furthermore, in this practical example, in order to shorten the storage time of the image data generated from the reading circuit 1, the data is stored in the MR code format first, and then converted into the MH code. Of course, the MH code encoding method may be stored first and then converted to the MR code.

〔Effect of the invention〕

By using the device of the present invention, image data that has been automatically subjected to both MR and MH encoding can be stored separately in the memory of the CCITT in a single operation, thereby reducing the processing capacity of the other device. At the same time, it becomes possible to transmit either encoded data, which eliminates wasted transmission time that occurs with conventional devices, and furthermore, the area required for the image memory is smaller than when storing raw image data. /10 or less, and as a result, it is possible to realize a two-axis device for sequential reporting that is small, inexpensive, and has high communication efficiency.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. 1... Reading circuit, 2... MRR encoding circuit, 3... Image memory, 4... MRR encoding circuit, 5...・MHH encoding circuit, 6...
・Image memory, 7... Control circuit, '8...
...Modem, 10...Gate circuit, 11.
... Encoder-decoding circuit.

Claims (1)

[Claims] first and second encoding circuits that encode image data using the MR encoding method and MH encoding method, respectively; a decoding circuit that decodes the encoded image data; and a decoding circuit that decodes the encoded image data. The first and second image memories respectively store the image data, and the first and second encoding circuits encode the image data of the transmitted document and store it in the first image memory, and further encode the image data of the transmitted document. After reading the contents of the memory and encoding the image data decoded by the decoding circuit using the other one of the first and second encoding circuits and storing it in the second image memory, the reception capability of the other device is determined. in response to a signal indicating the first
and a control circuit that controls reading and transmitting image data from one of the second image memories.