JPH03192865A - Facsimile relay transmission system - Google Patents

Abstract

PURPOSE:To avoid misunderstanding attended with deterioration in generating quality between a sender side and a receiver side by monitoring totally an error in a coded data due to the effect of the line at a facsimile receiver side through a facsimile transmitter and a facsimile repeater. CONSTITUTION:Upon the detection of a decoding error, a decoder 101 informs it as a decoding error signal (f) for each occasion. A decoding error count circuit 103 counts number of decoding error signals (f) and outputs the result as a count output (h). Moreover, an error count detection circuit 104 detects the decoding error count per page sent in succession to a generating data as a coding data from a facsimile repeater. An adder 105 adds the count output (h) from the decoding error count circuit 103 and a communication error count (i) from the error count detection circuit 104 and outputs the result as a decoding error count (k) in all communication.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a facsimile relay transmission system, and in particular,
The present invention relates to a facsimile relay transmission system in which a facsimile relay device is equipped with a document storage function and encoding/decoding capabilities.

[Conventional technology]

Generally, in facsimile relay transmission, a transmission document from a facsimile transmitter is temporarily stored in a facsimile relay device and then sent to the other party's facsimile receiver.

With such a configuration, communication charges can be reduced because, for example, a function called broadcast communication, which distributes the same document to multiple facsimile receivers, and a configuration that allows the use of a mixture of leased lines and public telephone networks can be achieved. There is an effect. However, in this type of facsimile relay transmission, since the data is passed through the public telephone network twice, once at the time of transmission and once at the time of reception, errors in encoded data due to the influence of the line increase.

In the conventional facsimile relay transmission method, in consideration of realizing various service functions such as broadcasting, time specification, and confidential communication, a method is used in which documents to be sent are temporarily stored in a facsimile relay device and then distributed. There is. Therefore, it is necessary to temporarily terminate communication with the facsimile transmitter, so errors in the encoded data are detected on the facsimile relay device side during storage, and a process called pre-line replacement, which is commonly used in G3 facsimile, is performed. While performing error correction,
It monitors whether the number of errors in encoded data is less than or equal to a certain judgment value. If it is above a certain judgment value, the line is disconnected as an abnormality, and if it is below a certain judgment value, it is assumed that the communication is normal, even if the image quality deteriorates to some extent, and the communication with the facsimile transmitter is terminated. Then, to the other party's facsimile receiver,
- Since the previously stored image data is transmitted from the facsimile relay device, error correction processing of the encoded data is similarly performed and recorded on the facsimile receiver side with the other party's facsimile receiver.

[Problem to be solved by the invention]

The conventional facsimile relay transmission method described above has the disadvantage that even if the document from the facsimile transmitter successfully reaches the recipient's facsimile machine, the image quality may deteriorate because the previous line replacement process has been performed twice. There is. In addition, at this time, since the communication between the sender and the receiver of the original has completed normally, there is no way to confirm whether the image quality deteriorated during the communication or whether the original was originally like this. There are also drawbacks.

[Means to solve the problem]

The facsimile relay transmission system of the present invention includes a means for detecting errors in encoded data caused by the influence of a line during communication, a means for counting the number of errors in encoded data occurring on a per-page basis, and a means for counting the number of errors in encoded data occurring on a page-by-page basis. A facsimile relay device having a means for adding and transmitting coded data in units of units, a means for detecting a count value of the number of errors in coded data added in page units, and a means for detecting a count value of the number of errors in coded data added in page units, and a facsimile receiver having means for detecting and counting errors, and is characterized in that errors in encoded data are monitored throughout all communications until the transmitted document is output to the recipient's receiver. do.

〔Example〕

Next, the present invention will be explained in detail using the drawings. FIG. 1 is a block diagram of a facsimile repeater according to an embodiment of the present invention, and FIG. 2 is a block diagram of a facsimile receiver according to an embodiment of the present invention.

First, referring to FIG. 1, document information sent from a facsimile transmitter is read as encoded data A by a decoder 1 at a reading timing B and is once decoded. When the decoder 1 starts decoding, it turns on the decoding dead signal C, activates the decoding error counting circuit 4, and monitors decoding errors (errors in the encoded data being transmitted) to ensure normal operation. Sometimes, the reproduced image data is transferred to the encoder 2 line by line together with the line synchronization signal F. The output of reproduced image data E from the decoder 1 is performed at the encoding timing G from the encoder 2. When a decoding error is detected in the decoder 1, the decoding error is notified to the decoding error counting circuit 4 each time using a decoding error signal, and the immediately preceding normal image data is sent as the reproduced image data E. Output and also perform previous line replacement processing. The encoder 2 re-encodes the reproduced image data E read by the decoder 1 line by line in accordance with the line synchronization signal and outputs the encoded data in synchronization with the output timing L. When the decoder 1 completes the decoding process for one page, it turns off the decoding dead signal C and notifies the decoding error counting circuit 4 that the decoding is complete. The decoding error counting circuit 4 counts the number of decoding error signals that occur while the decoding dead signal C is ON, and waits for the encoder 2 to complete its operation. Encoder 2 finishes the encoding process for one page, and R
When the transmission of encoded data indicating the end of a page called TC code is completed, the decoding error count output signal H instructs the decoding error counting circuit 4 to output the decoding error count for one page. . According to this instruction, the decoding error counting circuit 4 switches the selector 3 using the switching signal N, turns on the count value outputting signal J, prompts the encoder 2 to output the output timing L, and outputs the output timing L.
A count value output M is output in synchronization with .

When the output of the count value is finished, turn off the count value output signal J.
and notifies the encoder 2 of the end of count value output, and returns the selector 3 to its original state by the switching signal N. The count value output M is combined with the encoded data outputted in this way by the selector 3 after the encoded data (after the RTC code), and the count value output M is synthesized as accumulated data D according to the accumulation timing P. It is temporarily stored in memory 5. memory 5
The encoded data that has been stored is read by the communication control unit 6 as transmission data Q at a sending timing R, and is transmitted to the other party's facsimile. Even if encoded data and decoding error count values are combined and output in this way, in a general 03 facsimile, data after RTC is ignored, so communication can be performed normally without any influence.

Next, referring to FIG. 2, encoded data a sent from the facsimile relay device via the line is read and decoded at read timing b from the decoder 101, and is processed as reproduced image data C in line synchronization. signal d
At the same time, the recording timing from the recording section 102 is read by e and is recorded and outputted by the recording section 102. During the decoding process, the decoder 101 outputs the decoding process signal g.
Set it to N. If a decoding error is detected during this time, it is notified each time using a decoding error signal f.

The decoding error counting circuit 103 is configured so that the decoding error counter signal g is ON.
The number of decoding error signals f during this period is counted and output as a count output when the decoding process signal g turns OFF. Further, the error count value detection circuit 104 detects 1 which is sent as encoded data from the facsimile relay device following the image data.
This is a circuit for detecting the decoding error count value per page, and when the decoder 10 turns off the decoding process signal g (RT
After detecting the C code, the operation starts from (after detecting the C code), and while reading the encoded data a at reading timing b, detects the sent decoding error count value and outputs it as the previous communication error count value i. The adder 105 receives the count output from the decoding error counting circuit 103 and the error count value detection circuit 104.
It is added to the previous communication error count value i from , and output as the decoding error count value for all communications. Judgment value register 10
7, the number of decoding errors per page is set in advance to determine that it is acceptable, and the comparator 106 compares the decoding error count value k in all communications with the determination value l, The degree of error occurrence is notified as a comparison output m. The comparison output m may be used to notify the receiver of the original of the deterioration in image quality of the received original, or to request the sender to resend the original. With the configuration and operation as described above, it is possible for the facsimile receiver to monitor errors in encoded data due to the influence of the line on originals sent from the facsimile transmitter through all communications.

〔Effect of the invention〕

As explained above, according to the present invention, errors in encoded data due to the influence of the line can be monitored on the facsimile receiver side as a whole through the facsimile transmitter and the facsimile relay device. It is also possible to notify the sender of the deterioration or to request the sender to send the original again, which has the effect that the sender and the receiver can avoid misunderstandings caused by the deterioration of the image quality.

[Brief explanation of drawings]

FIGS. 1 and 2 are block diagrams showing one embodiment of the present invention. 1...Decoder, 2...Encoder, 3...
... Selector, 4 ... Decoding error counting circuit, 5 ... Memory, 6 ... Communication control section, 101 ... Decoder, 102 ... Recording section, 103 ... Decoding error counting circuit, 104
...Error count value detection circuit, 105...
・Adder, 106... Comparator, 107...
...Judgment value register.

Claims (1)

[Claims] A means for detecting errors in encoded data caused by the influence of a line during communication, a means for counting the number of errors in encoded data occurring on a page basis, and a means for adding and transmitting statistical values on a page basis. a facsimile relay device having a facsimile relay device, a means for detecting a count value of the number of errors in encoded data added on a page basis, and a means for detecting and counting errors in encoded data caused by the influence of a line on a page basis. 1. A facsimile relay transmission system comprising: a facsimile receiver having a facsimile receiver;