JPH0451661A - facsimile machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a facsimile device capable of transmitting and receiving data in two formats: character code and image data.

[Prior Art] Conventionally, facsimile apparatuses have been configured such that when an error is detected in transmitted information including a character code, the receiving side continues to request retransmission of the transmitted information until the correct transmitted information is received.

[Problems to be Solved by the Invention] However, in conventional facsimile machines capable of transmitting and receiving character codes and image data, the retransmission method described above is used to compensate for transmission errors in character codes included in transmitted information. If this is the case, depending on the state of the transmission path, the line occupancy time becomes long, and in some cases, the transmission information may become impossible to transmit.

The present invention has been made in view of the above, and an object of the present invention is to provide a facsimile device that reliably transmits transmission information including character codes and prevents the line occupation time from increasing due to the transmission of transmission information. The purpose is to

[Means for solving the problem] If the receiving side requests retransmission of transmitted information that includes a character code more than a predetermined number of times, the character code included in the transmitted information is automatically added to the image data. I converted it and sent it.

[Operation] Upon receiving the retransmission request signal sent when the receiving side detects an error in the transmitted information, the facsimile machine counts the number of times the retransmission request has been made from the receiving side. If the number of retransmission requests exceeds a predetermined number, the facsimile device automatically converts the character code included in the transmission information into image data and transmits the image data.

[Example] Hereinafter, an example embodying the present invention will be described with reference to the drawings.

FIG. 2 is an embodiment embodying the present invention, and is a block diagram showing the configuration of a transmitting part.

The input/output interface 102 enables the facsimile apparatus to be connected to the input/output device 101, such as a reading device, a personal computer, or a printing device, for inputting and outputting transmitted and received information. Transmission information input via the input/output interface 102 is sorted into character data and image data by a data identification unit 103.

The character data and image data selected by the data identification unit 103 are stored separately in a manual buffer for image data 104 and a manual buffer for character data 105, respectively.

When the input data is character data, the character data stored in the character data manual buffer 105 is sent to the transmission memory via the character code generation unit 106 that converts it into a character code (ASCII code, etc.) used at the time of transmission. 1
It is accumulated in 09.

On the other hand, when the input data is image data, the image data accumulated in the image manual buffer is sent to the transmission memory via an encoding unit 108 that encodes it based on a compression method such as the MH method or the MR method. 109. The transmission data stored in the transmission memory 109 is
A modulation section 111 that modulates a transmission signal, and an external line 11
The data is sent to an external public line 116 via a line network control unit 112 that controls the exchange of data sent and received with 6.

A counting section 114 that counts the number of retransmissions detected by the retransmission request signal detection section 113 is connected to the retransmission request signal detection section 113 for detecting a retransmission request signal from the receiving side. The system control unit 115 not only controls the entire system but also monitors the count value of the counting unit 114 and controls the retransmission method.

a character pattern generation unit 107 that generates a character pattern corresponding to the character data under the control of the system control unit 115 when the character data is converted into image data and transmitted in response to a retransmission request from the receiving side; , a data synthesis section 110 that synthesizes the image data and the character pattern data.

Next, the operation will be explained with reference to FIG.

FIG. 1 shows an example of a retransmission method when the transmission information is a character code.

First, in step 1 (hereinafter abbreviated as Sl), character data for transmission is input from an input device 101 such as a personal computer via the input/output interface 102. Next, in step 82, the character data is stored in the character data manual buffer 105. In S3, the character code generation unit 106 generates the character data manual buffer 105.
A character code for transmission corresponding to the character data stored in the character data is generated, and an error detection code is added thereto.

Then, in S4, the character code is stored in the transmission memory 109.

Next, in 85, a line is connected to the destination, and after the line connection is completed, one frame of the transmission character code stored in the transmission memory 109 is read out in S6, and transmission is started in S7.

On the other hand, on the receiving side, error detection is performed based on the error detection code added to the received transmission information. Therefore,
If an error is detected, the receiver sends a retransmission request signal to the sender until it receives correct transmission information from the sender. (Not shown) On the transmitting side, when the retransmission request signal detecting section 113 detects a retransmission request signal from the receiving side in S8, the number of retransmission requests is counted by the counting section 113 in S9.
14, and the system control unit 11
5 is notified that there is a retransmission request.

The system control unit 115 then controls the counting unit 114.
5IO), and controls the retransmission method as follows.

If the count value in the counting unit 114 does not exceed the preset number of times, the system control unit 115 moves to 86 to transmit the existing transmission data stored in the transmission memory 109 as is. Control as follows.

On the other hand, if the count value in the counting unit 114 exceeds a predetermined number of times, the system control unit 115
In S11, the character data stored in the character data manual buffer 105 is read out, and in S12, the character pattern generating section 107 is caused to generate a character pattern corresponding to the character data. Furthermore, in S13, the character pattern data is synthesized with the input image data in the data synthesis section 110. Then, this new image data is encoded again by the encoding unit 108, and S14
and stores it in the transmission memory 109. Next, in 815, the image data stored in the transmission memory 109 is read out, and in 816, the image data is transmitted again. Thereafter, the process returns to S8, and the above-described operations are repeated for transmission. After the transmission of all transmission data is completed (S18), the line is disconnected (519), and the transmission ends.

[Effects of the Invention] As explained in detail above, according to the present invention, in the case of communication including character codes, transmitted information can be reliably transmitted without occupying the line for a long time even if the line condition of the transmission line is poor. It is possible to improve communication throughput and reliability.

[Brief explanation of the drawing]

1 to 2 show one embodiment of the present invention. FIG. 1 is a flowchart showing the operation on the transmitting side in the present invention. FIG. 2 is a block diagram showing an example of the configuration of a facsimile apparatus according to the present invention. Character pattern generation section Data synthesis section Retransmission request signal detection section Counting section System control section

Claims (1)

[Claims] 1. Transmission information having an error detection code can be transmitted to the receiving side, and when the receiving side detects an error in the transmission information based on the error detection code, the transmission information is transmitted from the receiving side. If a facsimile device that can receive retransmission requests for transmitted information that includes a character code exceeds a predetermined number of times from the receiving side, the character code included in the transmitted information is automatically added to the image data. A facsimile device characterized in that the facsimile device converts the data into