JPH01290374A - Facsimile equipment - 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 machine, and particularly to a facsimile machine having an error correction function.

[Conventional technology]

A conventional facsimile apparatus having an error correction mode (actually, an error retransmission mode) has a memory space for error retransmission in addition to a memory space for substitute reception.

In conventional error retransmission, when an error is detected on the receiver side, a NACKY signal is sent using a backward channel to interrupt the transmitter's transmission. Therefore, the receiver was able to sequentially decode and record error-free data, so there was no need for the receiver to have a large-capacity memory. On the other hand, on the transmitter side, NAC is activated within a predetermined time after sending one frame data.
When the receiver does not detect K, it can be determined that the data is being received correctly, so new information can be stored in the memory space where the frame data is stored. The above-mentioned predetermined time varies depending on the frame size, NACK signal detection ability, line delay tolerance time, etc., but may be about 5 seconds, for example. And the amount of data for 5 seconds is 9600h/
Considering s, the required memory space was 6 Kbytes, and there was no need to have a large capacity memory.

[Problem that the invention is trying to solve] However,
In order to perform the error correction mode, it is necessary to have at least 64 Kbytes of memory. In order to reduce flow control, a double buffer (one buffer is 64Kb) is used.
yte), it is necessary to have 128 Kbytes of memory. With 128 Kbytes, about 6 to 7 charts can be stored when transmitting CCITTNOol charts in standard mode.

Providing a memory space used for the above-mentioned error correction separately from a memory space used for memory communication is a great waste from the viewpoint of effective use of memory space.

[Means for Solving the Problems (and Effects)] According to the present invention, in a facsimile machine having a means for storing information, the storage means used in the error correction mode and the storage means used in memory communication are shared. It is something to do.

This makes it possible to use memory space effectively. Then, when the usable memory capacity is more than a predetermined amount, it is determined that the communication function in error correction mode is available,
When the usable memory capacity is less than a predetermined amount, it is determined that there is no communication function in error correction mode. Here, when transmission in the error correction mode is selected on the receiver side and the available memory capacity fiX is t≦X≦a, single buffer reception is performed and the available memory capacity fiX is a. When ≦X (a>b), double buffer reception is performed. Double-buffer control has the advantage of requiring less flow control and shorter communication time than single-buffer control. Furthermore, on the transmitter side, when transmission in error correction mode is selected and the available memory capacity fiY is d≦Y≦C, transmission is performed using a single buffer with a small frame size capacity, When the usable memory capacity fiY is C≦Y≦b, double-buffer transmission is performed with a small capacity frame size, and the usable memory capacity Y ′b (b≦
When Y≦a, transmission is performed using a single buffer with a large frame size, and when the usable memory capacity Y is a≦Y, transmission is performed using a dumped buffer with a large frame size. I do.

This makes it possible to control whether or not the error correction mode is possible, depending on the status of the memory space used for memory communication, for example, proxy reception. Then, depending on the available memory space, it became possible to change the size of one frame and change buffer control, making it possible to communicate in the most efficient error correction mode.

In addition to the above, if received data is recorded on recording paper in the normal G3 mode and the recording paper runs out, proxy reception is performed in all information storage spaces. Also, if the received data is recorded on the recording paper in the error correction mode and the recording paper runs out, the storage space from all information storage means except the storage space necessary for error correction is used. Intercept reception is performed.In the latter case, the storage space required for error correction is minimized (specifically, single buffer control).
It becomes possible to do so.

As a result, even if received data is recorded on recording paper in the normal G3 mode or error correction mode and the recording paper runs out, the memory space can be used effectively.

〔Example〕

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

First, an outline of this embodiment will be explained below.

That is, in this embodiment, a memory space used for substitute reception in normal G3 mode and a memory space used for error correction mode (hereinafter referred to as ECM) are shared.

For example, as the above memory space, 2M bits = 256
Consider the case where you have a part-time job. Here, in order to communicate in ECM mode, the following memory space is essential. In the ECM mode, encoded data is made up of a predetermined number of bytes as frame information. Here, the predetermined number of bytes may be 64 bytes or 256 bytes. Then, a maximum of 256 frames are collected to form a unit block in which information is transmitted at one time. Here, the receiver must have the ability to transmit in 1 frame 256 bytes. Therefore, minimum 256 bytes x 256 blocks =
64 (Kbytes) of memory is required. Furthermore, this is a single buffer, and if double buffer control is performed, 128 Kbytes of memory is required. On the other hand, the transmitter may select transmission using 64 bytes per frame. When one frame is transmitted using 64 bytes, controlling with a single buffer requires 16 Kbytes of memory, and controlling with a double buffer requires 32 Kbytes of memory.
Kbyte memory is required.

Then, on the receiver side, the usable memory space
is 64 Kbytes or more, that is, when interception is performed and the information is not printed out and the remaining memory space is less than 192 bytes, it is determined that communication in error correction mode is possible, and the initial identification signal DIS Set the 27th bit of the PIF of the signal to 1. Then, the transmitter selected transmission in ECM mode in which 1 frame = 256 bytes (specifically, the PIF 2 of the DO5 signal
When the 7th bit receives the 1.28th bit φ PC8 signal), the usable memory space X is 128Kbytes.
e (a) In the above cases, image signals are received and recorded using double buffer control. At this time, if the usable memory space is 64 Kbytes (b) or more and less than 128 Kbytes, image signals are received and recorded using single buffer control. On the other hand, the transmitter uses an E of 1 frame = 64 bytes.
I have selected transmission in CM mode (specifically, DC8
The 27th and 28th bits of the signal PIF are 1 D
When the O3 signal is received), double buffer control is performed to receive and record the image signal.

On the other hand, on the receiver side, the usable memory space is 64
kbyte or more, that is, when proxy reception is performed and the remaining memory space without printing out the information is 192 bytes or more, it is determined that there is no communication function in error correction mode, and the initial identification signal D■S signal PIF of
The 27th bit of is set to φ.

Next, we will discuss the transmitter side. When transmission in error correction mode is selected on the transmitter side, the other receiver
Determine whether or not the device has the M function.

A case where the destination receiver has an ECM function will be described below. On the transmitter side, usable memory capacity fi
(Y) is 16 bytes (d) or more, 32 bytes (c
), transmission is performed using a single buffer with one frame size = 64 bytes. Specifically, DC3C10
Set 1 to the 27th and 28th bits of PIF. In addition, the usable memory capacity on the transmitter side is 32
When the frame size is equal to or larger than 64 bytes (C) and less than 64 bytes (d), double buffer transmission is performed with l frame size = 64 bytes. Specifically, 1 is set in the 27th and 28th bits of the FIF of the pC8 signal. Furthermore, when the usable memory capacity on the transmitter side is 64 bytes (b) or more and less than 128 bytes (a), single buffer transmission is performed with one frame size = 256 bytes. Specifically, the 27th bit of the FIF of the DC9 signal is 1.
Set φ at the 28th bit.

In addition to the above, if received data is recorded on recording paper in the normal G3 mode and the recording paper runs out, proxy reception is performed in all information storage spaces. In addition, if received data is recorded on a recording paper in error correction mode and the recording paper runs out, the system switches to single-buffer control and uses the memory necessary to perform error correction from all information storage means. Performs proxy reception in the memory space excluding the memory space.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 shows a block diagram of an embodiment of a facsimile machine according to the invention.

In Figure 1, 2 uses the telephone network for data communication, etc., so it connects to the terminal of the line and controls the connection of the telephone exchange network, switches to the data communication path, and maintains the loop. Network control unit NCU (Network
Control Unit).

The signal line 2a is a telephone line. NCU2 is the signal line 36a
If the signal level is "φ", the telephone line is connected to the telephone side, that is, the signal line 2a is connected to the signal line 2b.
Connect to. Further, a signal on the signal line 36a is inputted, and if the signal level is "1", the telephone line is connected to the facsimile machine side, that is, the signal line 2a is connected to the signal line 2C. Under normal conditions, the telephone line is connected to the telephone side.

4 is a telephone.

6 is a hybrid circuit that separates the transmission system signal and the reception system signal. That is, the transmission signal of the signal line 20a is
The signal is transmitted to the telephone line via the NCU 2 through the signal line 2c. Further, a signal sent from the other party passes through the NCU 2, passes through the signal line 2C, and is output to the signal line 6a.

Reference numeral 8 denotes a reading circuit which sequentially reads image signals for one line in the main scanning direction from the original to be transmitted, and creates a signal string representing binary values of white and black. It consists of an image sensor such as a COD (charge coupled device) and an optical system. The white and black binary signal strings are output to the signal line 8a.

Reference numeral 10 denotes a circuit that inputs the read data output to the signal line 8a and outputs encoded data (MH (Modified Huffman) encoding or MR (Modified Read) encoding) to the signal line 10a.

J2 is an image memory circuit used during transmission in substitute reception and error correction mode, and has 2M bits.

12 does not use this image memory when a signal of signal level "φ" is output to the signal line 36j. This image memory is used when a signal of signal level "1" is output to the signal line 36j.

First, the usable memory capacity is output to the Y signal line 12c. Hereinafter, a case will be described in which a signal of signal level "1" is output to the signal line 36j and use of this image memory is selected.

When a signal with a signal level "φ" is output to the signal line 36k, it indicates that the image is to be received on behalf of this image memory, and when a signal with a signal level "1" is output to the signal line 36k, there is an error. Communication is performed in correction mode (hereinafter referred to as ECM). In the latter case, transmission (φ is the output) or reception (l is the output) is selected by the signal output to the signal line 361.

Also, when a signal with a signal level of "φ" is output to the signal line 36h, one frame = 64 octets is transmitted, and when a signal with a signal level of "1" is output, a frame = 256 octets is transmitted. transmission. Also,
When a signal of signal level "φ" is output to the signal line 36i, single buffer processing is performed and the signal level rl
When the J signal is being output, double buffer processing is performed.

The flow of data when proxy reception is performed will be explained. While recording reception in normal G3 mode, there is no recording paper (
If there is no recording paper or there is no recording paper from the beginning, and proxy reception is possible, 12 inputs and records data on the signal line 22a, and performs proxy reception. After the proxy reception is completed, when an instruction to output the proxy reception data is given to the signal line 36g, the stored data is output to the signal line 12b and recorded.

On the other hand, the flow at the time of ECM transmission will be explained. signal line 10
The encoded data output to a is stored in memory. Then, the frame information of the frame number specified on the signal line 36d is outputted to the signal line 12a.

Also: Explain the flow when receiving ECM. Signal line 2
The frame data outputted at 6a is stored in the corresponding image memory space. The data up to the frame data in which no error has occurred are sequentially output to the signal line 12b.

14, an address field, a control field, and an F
Add the CF field and PIF field (stores the frame number currently being transmitted) and transfer that information to the HD
This circuit outputs LC formatted information to the signal line 14a. The HDLC framing circuit 14 also sends a flag for flow control on the transmitter side to the signal line 14a when a signal of signal level "1" is output to the signal line 36e.

16 is a modulator that performs modulation based on the well-known CCITT recommendation V27ter (differential phase modulation) or V2O (orthogonal modulation). The modulator 16 inputs the signal on the signal line 36c, and when this signal level is "φ", the signal on the signal line 10
When the signal level of the signal line 36c is rlJ, the signal of the signal line 14a is inputted, modulation is performed, and the modulated data is outputted to the signal line 16a.

18 is a modulator that performs modulation based on the known CCITT recommendation V21. The modulator 18 inputs the procedure signal of the signal line 36b, performs modulation, and outputs the modulated data to the signal line 18a.

Reference numeral 20 denotes an adder circuit that inputs the signals of the signal line 16a1 and the signal line 18a and outputs the added result to the signal line 20a.

22 is a demodulator that performs demodulation based on the well-known CCITT recommendation V27ter (differential phase modulation) or V2O (orthogonal modulation). The demodulator 22 inputs the signal on the signal line 6a, performs demodulation, and outputs demodulated data to the signal line 22a.

24 inputs the demodulated data output to the signal line 22a,
Perform φdelete of the data converted to HDLC and convert it to HDLC.
This is an HDLC deframing circuit that outputs data before being formatted to the signal line 24a.

Reference numeral 26 denotes a temporary memory circuit that temporarily stores encoded image information output to the signal line 24a on a frame-by-frame basis. Data correctly received in frame units is output to the signal line 26a.

28, when a signal of signal level "φ" is output to the signal line 36f, the demodulated data output to the signal line 22a is output to the signal line 36f, and a signal of signal level "1" is output to the signal line 36g. When a signal of signal level "φ" is output to the signal line 12b, a signal of signal level "1" is output to the signal line 36f from the demodulated data output to the signal line 12b, and a signal of signal level "φ" is output to the signal line 36g. 1", the substitute reception data output is input to the signal line 12b, and the decoded data (modified Huffman so-called MH decoding or modified read so-called MR decoding) is sent to the signal line 12b. 2
This is a circuit that outputs to 8a.

30 is a recording circuit which inputs the signal outputted to the signal line 28a and sequentially records one line at a time. 30 outputs a signal of signal level rlJ to the signal line 30a when detecting the black stripe of the near end mark. When not detected, a signal of signal level "φ" is output.

32 is a demodulator that performs demodulation based on the known CCITT recommendation V21. The demodulator 32 receives the signal on the signal line 6a, performs V21 demodulation, and outputs demodulated data to the signal line 32a.

34 is a circuit on the transmitter side that detects whether or not ECM communication is selected. The ECM communication selection circuit 34 outputs a signal of signal level "1" to the signal line 34a when communication using ECM is selected on the transmitter side, and outputs a signal with a signal level of "1" to the signal line 34a when communication using ECM is selected on the transmitter side. When there is no signal, a signal of signal level "φ" is output to the signal line 34a.

36 is a control circuit that mainly performs the control described in the first section of the embodiment. The control circuit 36 is composed of a microcomputer, a ROM storing a control program, a RAM for temporarily storing data, and other peripheral devices for the microcomputer.

FIG. 2 is a flowchart showing the control operation of the control circuit 36 shown in FIG.

In FIG. 2, step S40 represents the beginning. In step S42, a signal of signal level "φ" is output to the signal line 36a to turn off CML.

Then, in step S44, a signal of signal level "φ" is first output to the signal line 36j, and it is selected not to use the image memory.

Further, in step 346, a signal of signal level "φ" is outputted to the signal line 36g to set a state in which no output of proxy reception is performed.

Next, in step S48, it is determined whether facsimile transmission has been selected. If it is determined in step 348 that facsimile transmission has been selected, the process proceeds to step S52, and if it is determined that facsimile transmission has not been selected, the process proceeds to step S350.

When the process advances from step S48 to step S50, it is determined in step S50 whether facsimile reception has been selected. If it is determined that facsimile reception has been selected, the process proceeds to step 5102, and if it is determined that facsimile reception has not been selected, the process proceeds to step 5196.

On the other hand, when the process advances from step S48 to step 352, a signal with a signal level of "1" is outputted to the signal line 36a in step S52 to turn on the CML.

Then, in step 554, the pre-procedure of the T30 facsimile communication procedure recommended by CCITT is executed.

Next, in step S56, the digital identification signal (DLS signal) of the other device is analyzed to determine whether or not the other device has an ECM function. If the 27th bit of the FIF of the DLS signal is 1, that is, the partner device has an ECM function, the process advances to step 358. Also, the FIF 2 of the DLS signal
If the 7th bit is "φ", that is, there is no ECM function, the process advances to step S94.

When the process advances from step S56 to step S58, a signal from the signal line 34a is inputted in step S58, and it is determined whether transmission by ECM is selected. and signal line 34a
If the signal level of the signal line 34a is "1", that is, ECM transmission is selected, the process proceeds to step S60, and if the signal level of the signal line 34a is "φ", that is, ECM transmission is not selected, the process proceeds to step S94.

In step S60, input the signal on the signal line 12c,
It is determined whether the available memory capacity is 16 bytes or more. If the number is greater than or equal to 16 bytes, the process advances to step S62, and if it is less than 16 bytes, the process advances to step S94. When less than 16 bytes, E
Since CM transmission is not possible, communication is performed using normal G3.

Next, step S62. S64. In S66, the size of available memory capacity is determined. When the usable memory capacity is greater than or equal to 16 bytes and less than 32 bytes, a single buffer (signal level "φ" is applied to signal line 36i) is used.
One frame is 64 octets (a signal of signal level "φ" is output to the signal line 36h) (step S72.576).

Also, when the usable memory capacity is 32 bytes or more and less than 64 bytes, double buffer processing is set (a signal with signal level "1" is output to signal line 36i), and the frame is set to 64 octets (signal A signal of signal level "φ" is output to line 3611) (step 574.
376).

Also, the usable memory capacity is 64 bytes or more, 128 bytes or more.
When the number of octets is less than /
output a signal with signal level “1” to h (step 3
78,570).

When the usable memory capacity is 128 bytes or more, double buffer processing is set (a signal of signal level rlJ is output to the signal line 36i, and one frame is set to 64 octets (a signal of signal level rlJ is output to the signal line 36h). output) (steps 868 and 570).

When the process proceeds from step S76 or S70 to step S80, a signal of signal level "1" is output to the signal line 36j in step S80, and it is selected to use the image memory.

Next, in step S82, a signal of signal 1 novel "1" is output to the signal line 36k, and the image memory is selected to be used for ECM.

Further, in step S84, a signal of signal level "φ" is output to the signal line 36A, and the image memory is selected to be used in the transmission mode.

Then, in step S86, a pre-procedure is executed. here,
The 27th bit of the PIF of the digital command signal (DO8 signal) is set to 1, which declares that transmission will be performed in the cell L-L, ECM mode. Further, the 28th bit of DC3C10PIF is set to φ when one frame is 256 offsets, and to l when it is 64 offsets.

Next, in step S88, a signal of signal level rlJ is output to the signal line 36c, and the V27ter or V29 modulator 16 is set to a mode in which the signal on the signal line 14a is input and modulated.

Then, in step S90, the mode image transmission set in the previous procedure in ECM is executed. When the image transmission is completed, a post-procedure is executed in step S92, and then the process returns to step S42.

On the other hand, when the process proceeds from step S56, S58, or S60 to step S94, a pre-procedure is executed in step S94.

Here, the 27th bit of the PIF of the DO3 signal is set to φ to declare that no ECM transmission will be performed.

Following the previous procedure, in step S96, a signal of signal level "φ" is output to the signal line 36c, and the V27ter or V29 modulator 16 inputs the signal of the signal line 10a and is set to a modulation mode. Then, in step S98, image transmission in normal G3 mode is performed.

When the image transmission is completed, post-procedures are executed in step 5100.

Further, when the process proceeds from step S50 to step 5102, the signal level rl is applied to the signal line 36a in step 5102.
Output the J signal and turn on CML.

Next, in step 5104, it is determined whether a black band indicating that the remaining amount of recording paper is less than a predetermined amount is detected, that is, whether the signal level of the signal line 30a is "1". In step 5104, a black band indicating that the remaining amount of recording paper is less than a predetermined amount is detected, that is, the signal line 30 is detected.
If the signal level of a is rlJ, step 51
Proceed to 88. Also, a black band indicating that the remaining amount of recording paper is less than a predetermined amount is not detected, that is, the signal line 30 is not detected.
If the signal level of a is "φ", step 51
Proceed to 06.

Proceeding to step 5106, the signal on the signal line 12c is input and the usable capacity is recognized. If the available memory capacity is 64 bytes or more, step 5110
If the available memory capacity is less than 64 bytes, the process proceeds to step 3108.

Proceeding to step 5108, the pre-procedure is executed.

Here, φ is set in the 27th bit of PIF of the DIS signal to declare that there is no ECM function. and step 5
Proceed to step 162.

On the other hand, when proceeding from step 5106 to step 5ilo, the pre-procedure is also performed, but in this pre-procedure, the 27th bit of PIF of the DLS signal is set to l, and the presence of the ECM function is declared.

When the process advances from step 5110 to step 5112, the DC3C10 analyzes the data sent from the other party and determines whether ECM communication is selected on the transmitter side.D
When the 27th bit of C3C10PIF is 1, that is, ECM communication is selected on the transmitter side, the process advances to step 5114. If the 27th bit of the PIF of the DC5 signal is φ, that is, ECM communication is not selected on the transmitter side, the process advances to step 5162.

Proceeding from step 5112 to step 5114, in step 5114, the specified frame size is 256 offsets, that is, 2 of the PIF of the DO8 signal.
It is determined whether the 8th bit is φ or not.

If the specified frame size is 256 offsets, that is, D
When the 28th bit of C3C10FIF is φ, the process advances to step 5116. If the specified frame size is 64 offsets, that is, the 28th bit of the DC3C10FIF is 1, the process advances to step 5120.

When the process advances from step 5114 to step 8116, it is determined in step 5116 whether the usable memory capacity is 128 bytes or more. When the available memory capacity is greater than or equal to 128 bytes, step 512
If the available memory capacity is less than 128 bytes, proceed to step 5118.

Proceeding to step 8118, a signal of signal level "φ" is output to the signal line 36i, single buffer processing is performed,
Proceed to step 8126.

On the other hand, when proceeding from step 5114 to step 5120,
A signal of signal level "1" is output to the signal line 36i to perform double buffer processing. Then, in step 5122, a signal of signal level "φJ" is output to the signal line 36n,
It is declared that the size of one frame is 64 offsets, and the process advances to step 8128.

Further, when the process proceeds from step 8116 to step 5124, a signal of signal level "1" is output to the signal line 36i, double buffer processing is performed, and the process proceeds to step 5126.

When the process proceeds to step 8126, a signal of signal level rlJ is output to the signal line 36h, declaring that the size of one frame is 256 offsets, and the process proceeds to step 5128.

In step 8128, the signal level “1” is applied to the signal line 36j.
” signal and use the image memory.

Then, in step 5130, a signal of signal level "1" is output to the signal line 36k, the image memory is selected to be used for ECM, and the process proceeds to step 5132.

When the process proceeds to step 5132, the signal level "
1" signal, and the image memory is selected to be used in reception mode. Then, in step 5134, a signal of signal level "1" is output to the signal line 36f, and the decoding circuit 28 receives the signal on the signal line 12b and instructs to decode it.

Next, in step 5136, a signal of the signal level "φ" is output to the signal line 36g, and the output of the substitute reception data is not selected. Then, the process advances to step 8138. Step 8
At 138, the image signal is received by ECM.

Next, in step 5140, the signal on the signal line 30a is input, and it is determined whether a black band is detected, that is, whether the signal level on the signal line 30a is "1".

A black belt is detected, that is, the signal level of the signal line 30a is r
If it is lJ, the process advances to step 8146. Further, when a black belt is not detected, that is, when the signal level of the signal line 30a is "φ", the process advances to step 5142.

In step 5142, it is determined whether reception has ended. If reception has not been completed, the process advances to step 5138;
When the reception is completed, the process advances to step $144.

Proceeding to step 5144, post-procedures are performed. When the post-procedure is completed, the process returns to step S42.

On the other hand, when proceeding from step 5140 to step 5146,
In step S14.6, it is determined whether or not the reception of one page of the document information for which a black band was detected during reception has been completed, and when the reception has been completed, the process proceeds to step 5148.

In step 8148, the signal level "φ" is applied to the signal line 36i.
” signal and select to perform single buffer processing.

Then, in step 5150, a signal of signal level "φ" is output to the signal line 36k, and the image memory is selected to be used for substitute reception. In this case,
Reception is performed by ECM, and the data is received into the image memory (therefore, the capacity of the thin full buffer for performing ECM is used for ECM.

Next, in step 5152, the image signal is received by the ECM.

Then, in step 5154, the signal on the signal line 12c is input, and it is determined whether or not there is no more usable memory because proxy reception is being performed. If there is no more available memory, the process advances to step 8158 to display that the interception memory has overflowed, and then to step 5160.
Proceed to. If there is still available memory, the process advances to step 8156.

In step 8156, it is determined whether the reception has ended. If the reception is completed, the process advances to step 8160, and if the reception is not completed, the process advances to step 5138.

Step S] When the process proceeds to 60, post-procedures are performed and then the process returns to step S42. When proceeding to step 8162 by step 5108 or 5112, in step 5162,
A signal of signal level "φ" is output to the signal line 36f, and the decoding circuit 28 inputs the data output to the signal line 22a, instructing to perform decoding.

Then, the process advances to step 5164, and in step 5164, the image signal is received in the normal G3 mode. When image signal reception in the normal G3 mode is completed, the process advances to step 5166.

Proceeding to step 5166, a signal from the signal line 30a is input, and it is determined whether a black band has been detected. If the signal level of the signal line 30a is "1", that is, if a black band is detected, the process advances to step 5172. If the signal level of the signal line 30a is "φ", that is, if no black belt is detected, the process advances to step 8168.

In step 5168, it is determined whether or not the reception has ended. If the reception has ended, the process advances to step 5170, and after executing the post-procedure, the process returns to step S42. If the reception has not ended, the process returns to step S42. When the process proceeds from step 8166 to step 5172, it is determined in step 5172 whether or not the reception of the page information for which the black belt was detected during reception has been completed, and when the reception of this page is completed, step 5172 is performed.
Proceed to 174.

In step 5174, the signal level "1" is applied to the signal line 36j.
output signal and select to use image memory. Then, in step 5176, a signal of signal level "φ" is output to the signal line 36k, and the image memory is selected to be used for substitute reception. When the process advances from step 8176 to step 8178, proxy reception in normal G3 mode is performed in step 5178.

When the proxy reception in the normal G3 mode is completed, in step 8180, the signal on the signal line 12c is input and the proxy reception is performed, so it is determined whether or not there is no more usable memory. If there is no available memory,
The process proceeds to step 8184 to display that the substitute reception memory has overflowed, and then proceeds to step 5186.

Also, if there is memory available at step 8180,
Proceeding to step 31B2, in step 3182,
Determine whether reception is complete. When reception is complete,
After proceeding to step 8186 and executing the post-procedure, the process returns to step S42, and if reception has not been completed, step 817
Return to 8.

On the other hand, when proceeding from step 5104 to step 8188,
In step 5188, the signal on the signal line 12c is input to determine whether there is any usable memory.

When there is available memory, the process advances to step 5190; when there is no usable memory, reception is not possible and the process returns to step S42.

Proceeding from step 5188 to step 5190, a pre-procedure is performed in step 5190. Here, DLS
Set φ in the 27th bit of the PIF of the signal, and
Declare the change to C.

Next, in step 5192, a signal of signal level rlJ is output to the signal line 36j, and use of the image memory is selected. Then, in step 5194,
A signal of signal level "φ" is output to the signal line 36k, the image memory is selected to be used for substitute reception, and the process returns to step 8178.

On the other hand, when the process advances from step S50 to step 5196, it is determined in step 5L96 whether or not proxy reception is being performed and the proxy reception information is stored in the image memory. If the information received by proxy is stored in the image memory, the process advances to step 8198, where a display indicating that proxy reception is being performed is performed, and the process advances to step 5200. If the information received by proxy is not stored in the image memory, the process advances to step 8206, where a message indicating that proxy reception is not being performed is displayed, and step 52
Proceed to 08.

In step 5200, it is determined whether there is a request to output the information that has been received by proxy. If there is a request to output the proxy-received information, the process advances to step 5202, and if there is no request to output the proxy-received information, step S4
Return to 2.

In step 5202, the signal 1 novel “
1'' signal, and the decoding circuit 28 inputs the signal to the signal line 12 and decodes it. And step 5204
A signal with a signal level of "1" is output to the signal line 36y to instruct output of substitute reception data.

In step 5208, the memory overflow display for proxy reception is cleared, and then the process returns to step S42.

In the above embodiment, the storage means used in the error correction mode and the storage means used in proxy reception are shared.

However, the present invention is not limited to proxy reception, and the memory (storage means) used for memory reception or memory transmission and the storage means used in error correction mode may be shared.

Furthermore, in the above embodiment, when the received data is recorded on the recording paper in the error correction mode and the recording paper runs out, the storage space necessary for error correction is removed from all information storage means. It is designed to perform proxy reception in a storage space that has been created. However, in the end, the data may be intercepted in a memory space for error correction.

Further, in the above embodiment, it is determined that the communication function in the error correction mode is available when there is a capacity that can store information of a predetermined amount or more, and when the capacity that can store information is less than the predetermined amount, the communication function is determined to be available in the error correction mode. It is determined that there is no communication function.

In addition, if received data is recorded on a recording paper in error correction mode and the recording paper runs out, the reception data will be transferred to the storage space excluding the storage space necessary for error correction from all information storage spaces. I try to do this.

However, if the received data is recorded on the recording paper in error correction mode and the recording paper runs out (specifically, a near-end mark on the recording paper is detected and only that page has been received), Interrupt reception without performing proxy reception. That is, proxy reception is performed only in the normal G3 mode.

In addition, if proxy reception is not performed, it is determined that the error correction function is available, and if proxy reception is performed,
It is determined that there is no error correction function. Here, in the case of a receiver, it is assumed that recording paper is available. If there is no recording paper, if the memory for proxy reception is available, the normal G
It may be determined that reception is possible only in 3 modes, and the reception operation may not be performed when the memory for proxy reception cannot be used.

〔effect〕

As described above, according to the present invention, memory can be used effectively,
Moreover, efficient communication can be performed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the facsimile apparatus of this embodiment, and FIG. 2 is a flowchart showing the control operation of the control circuit 36 of FIG. 1. 2 is NCU. 4 is a telephone, 6 is a hybrid circuit, 8 is a reading circuit, 10 is an encoding circuit, 12 is an image memory circuit, 14 is an HDLC framing circuit, 16 is a V27
ter or V29 modulator, 18 is V21 modulator, 20 is addition circuit, 22 is V27ter or V29 demodulator, 24 is HD
LC deframing circuit, 26 a temporary memory circuit, 28 a decoding circuit, 30 a recording circuit, 32 a V21 demodulator, 34 an ECM communication selection detection circuit, and 36 a control circuit.

Claims (8)

[Claims] (1) A facsimile device having means for storing information, characterized in that the storage means used in error correction mode and the storage means used in memory communication are shared. (2) In the facsimile machine according to claim 1, when the capacity for storing information is more than a certain amount,
A facsimile apparatus is characterized in that it is determined to have a communication function in an error correction mode, and when the information storage capacity is less than a predetermined amount, it is determined to have no communication function in an error correction mode. (3) The facsimile apparatus according to claim 2, wherein buffer control for error retransmission is changed depending on the difference in information storage capacity. (4) In the facsimile apparatus according to claim 2, when the receiving side transmits an initial identification signal with a communication function in error correction mode when the capacity for storing information is more than a predetermined amount. A facsimile apparatus characterized in that, when the information storage capacity is less than a predetermined amount, the facsimile apparatus transmits an initial identification signal with no communication function in an error correction mode. (5) In the case of the transmitter side of the facsimile apparatus set forth in claim 2, the capacity for storing information is at least a predetermined amount, and the receiver has a communication function in error correction mode. 1. A facsimile device that performs communication in an error correction mode only when transmission in an error correction mode is selected on a transmitter side. (6) The facsimile device according to claim 5, wherein the frame size is changed depending on the difference in information storage capacity. (7) In the facsimile apparatus according to claim 1, when the received data is recorded on recording paper in the normal mode and the recording paper runs out, proxy reception is performed in all information storage spaces, If received data is recorded on recording paper in error correction mode and the recording paper runs out, substitute reception is performed in the storage space of all information storage means excluding the recording space necessary for error correction. A facsimile device characterized by: (8) In the facsimile apparatus according to claim 7, when received data is recorded on recording paper in error correction mode and the recording paper runs out, the storage space necessary for error stop is saved. A facsimile machine characterized by being minimal.