JPS63287171A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To faithfully reproduce a re-transmission page from the transmission side by returning a negative answer for all the pages in a window size WS in the event of an error. CONSTITUTION:Upon the receiving of an image information from the opposite facsimile equipment through a line, a line controller 6 transmits the image information to an encoder/decoder 4. Upon receiving the information, the encoder/decoder 4 decodes it, and decides the presence/absence of an error. In the event of an error, the line ccntroller 6 returns a response RDPBN for images equal to the quantity of a window size WS. Thereafter, an image information retransmitted from the opposite facsimile terminal is outputted by a recorder 3 in accordance with procedures for printing.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a facsimile device.

[Prior Art] Conventional 64 facsimile equipment in accordance with CCITT's T.62 Recommendation (control procedures for Teletex and Group 4 facsimile services) is CI) as shown in Figure 4.
Images are sent using UI (command, document, user, information) signals.

Also, according to the concept of window size, the response of the other receiver (RDPHP, i.e. response, document,
It is possible to send out pages of window size WS (integer value) without waiting for pages, boundaries, positive). An example of this is shown in Figure 5, where WS=3
This is the case.

Here, the window size WS is an antithetical number that allows transmission without waiting for a response from the other receiver. In addition, Figure 4 shows
FIG. 3 is a diagram showing a G4 communication protocol in the case of window size=1.

On the other hand, CCITT Recommendation T.62 stipulates that if an error is detected on the receiving side, a negative response of RDPBN (Response, Document, Page, Boundary, Negative) should be returned. In this case, the transmitting side has the option of restarting transmission using a predetermined method.

On the other hand, since the conventional 04 facsimile equipment uses a two-dimensional compression method called the MMR encoding method, it is possible to check whether an error has occurred during decoding processing. Then, a certain page among the received pages (for example.

If only the second page) is found to be an error page after image check (if only the second page is an error page),
If the RDPBN (Document Page Boundary Negative Response) of the first response (response to page 1) is set to RDPBP (Document Page Boundary Positive Response), the retransmission page will be from the above error page (from the 2nd page), so the above error page The receiving side must hold the previous page (the first page).

By the way, if the sending side resumes the interrupted transmission, C
Cancellation is performed by continuous transmission of DC (document continuation command) and CDD.

Transmission is also restarted by CDS (document start command). If the sender adopts this retransmission method,
In the above example, there is a possibility that the first page is included in the retransmission page. In this case, the receiving side cannot accurately determine whether to print out the retransmitted page or the first page, or whether to print out both.

[Problems to be Solved by the Invention] The conventional apparatus described above has a problem in that the receiving side may not be able to accurately determine the print output.

[Means for Solving the Problems] According to the present invention, when an image reception error occurs, all page reception for the window size after the image reception error is made an error.

[Function] According to the present invention, when a single image reception error occurs, all pages received for the window size after the image reception error are treated as errors, so that the receiving side can accurately judge the print output. .

[Example] FIG. 1 is a block diagram showing one embodiment of the present invention.

This embodiment includes a reading device l that reads an image when copying or transmitting, a central processing unit 2 that controls the entire device,
A recording device 3 that prints images when copying or receiving, an encoding/decoding device 4 that compresses or expands image information when sending and receiving facsimile images, a memory storage device 5 that temporarily stores images, and facsimile communication. It has a line control device 6 that transmits and receives signals to and from the line used when carrying out the operations.

Further, the central processing bag 212 is an example of a means for making all page receptions corresponding to the window size after the image reception error error when a single image reception error occurs.

Next, the operation of the above embodiment will be explained.

FIG. 2 is a flowchart showing the operation of the above embodiment. FIG. 3 is a diagram showing the communication protocol in the above embodiment.

First, initialize (Sl) and start receiving (S
2), then check the page and if it is normal (S3), RDP
A BP (document page boundary positive response) is sent (S4), and it is determined whether all pages have been completed (S6).

On the other hand, when checking the pages (33), if there is an error page, RDP is sent as a response for the pages within the window size Ws.
Sends BN (Document Page Boundary Negative Response). As a result, all page reception after the image reception error for the window size W8 is made an error. Then, the next page is processed. The window size ws is the number of pages that can be sent without waiting for a response from the other receiver.

That is, when image information is received from the other party's facsimile terminal via the line, the line control device 6 sends the image information to the encoding/decoding device 214. When the encoding/decoding device 214 receives the image information, it decodes it and determines whether there is an error. If there is no error, the image data is sent to the memory storage device 5, and then the central processing bag Zt2 is sent to the recording device W! 13, the image data stored in the memory storage device 5 is printed.

On the other hand, if an error occurs, the line control device 6 returns an RDPBN response to the image for the window size WS, and then sends the image information retransmitted from the other party's facsimile terminal to the record bag according to the above procedure. 21
3 prints out.

[Effects of the Invention] According to the present invention, by returning a negative response to all pages corresponding to the window size WS when an error occurs, it is possible to faithfully reproduce the retransmitted page on the sending side. have an effect.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is a flowchart showing the operation of the above embodiment. FIG. 3 is a diagram showing the communication protocol in the above embodiment. Figure 4 shows the normal G4 when the window size WS=1.
FIG. 3 is a diagram illustrating an example of a communication protocol. FIG. 5 is a diagram showing an example of an error retransmission protocol when the window size WS=3. 1... Reading device, 2... Central virtual device, 3... Recording device, 4... Encoding/decoding device, 5... Memory storage device, 6... Line control device. Patent Applicant: Canon Co., Ltd. Agent: Arata Yokubo - Figure 3 Figure 4: 斯下” - No, Jtt, Vpe; No, NG Page N
O.

Claims (1)

[Claims] A facsimile apparatus characterized in that, when an image reception error occurs, all page reception for a window size after the image reception error is made an error.