JPS61150568A - Picture communication device - Google Patents

Abstract

PURPOSE:To shorten a time required for communication procedure and to reduce communication cost by setting communication mode basing on communication information stored in a storage unit when changing communication mode in the course of picture communication of plural originals, and omitting training and training check which are protocol of picture communication. CONSTITUTION:When transmission is started and DIS is received, transmitting side stores this in a memory. Then, transmission mode is set to a digital instruction signal DCS and sent, and training TCF is transmitted. When reception of a reception preparation confirming signal CFR is confirmed, training then picture signals are transmitted. When picture signals for an original are completed, a picture signal termination signal RTC is transmitted. Then, when receiving of a message confirming signal MCF is confirmed, DIS is read out from a memory if it is mode change for which confirmation of presence of succeeding original and mode change is made. Transmission mode is set to DSC and transmitted, and when CFR is received, picture signals are transmitted. In receiving side, DCS is received and receiving mode set. Thus, training and TCF can be omitted.

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to an image communication system.

[Prior art]

Conventional GS facsimile communication procedures have followed Recommendation T.30 in the CCITT Recommendations, ``Procedures for Document Facsimile Transmission in General Telephone Switched Networks.''

Below, in accordance with Recommendation T.30, the procedure for multi-page transmission is shown using diagrams in the following order: when there is no mode change, when there is a mode change, after the final manuscript +11ff, and when the transmission speed falls pack. I will explain.

Figure 1 (a) shows the facsimile communication procedure when there is no mode change. In Figure 1 (a), after the transmitting side detects the reception readiness confirmation signal (CFR) (lla), it sends a raking signal. After (12a), the first image signal is transmitted (13a). When the image signal transmission is completed, a both signal end indication (RTC) is transmitted (15a).

RTC means EOL (000...001゜1
One °“o” and one “’t”) in 6 pieces,
This notifies the receiving side that the image signal has ended. Note that the RTC is transmitted at the same transmission speed as the image signal. On the other hand, the receiving side detects the RTC that comes consecutively after the image signal (X5a), learns that the image signal has ended, and waits for a procedure signal.

After RTC transmission, the sending side should send a multi-page signal (MPS) if there is a next document and there is no mode change.17
a) Inform the receiving side that the image signal of the primary original will be transmitted in the same mode as before. On the receiving side, MPS must be detected18
a) Next manuscript Informs that both signals of the manuscript have been correctly received and waits for the next image signal.The transmitting side detects the MCF.
a) After waiting for the preparation for sending the next manuscript to be completed, send the training again in the same way as the first copy (21a).

Transmission of the second image signal is started (22a).

Repeat this process as long as there is a manuscript.

Note that the procedure before transmitting the first image signal is not directly related to the present invention, so a description thereof will be omitted.

Figure iR1 (b) shows the communication procedure when there is a mode change. The procedure is the same as up to lla in FIG. 1(a).

After sending the first image signal, send the RTC (15
b) If there is a mode change, an end-of-message signal (EOM) is sent (17b), which tells the receiving side to receive the second document in a different mode from the first. On the receiving side, after detecting EOM (18b), it sends an MCF (19b), and according to the T-30 recommendation, after sending an MCF, it sends DIS again 6 seconds later to inform the sending side of its own capabilities (2 l b) , the sending side is.

DIS detection (22b) L, send DCS 23b),
Inform the receiver of the mode for the second image. The receiving side detects the DCS 24b), recognizes the second mode, and then checks the modem's training again using training/TCP, and if the training is OK, sends CFR.27b) The transmitting side goes to receive the image signal. is CFR detection (28
Through b), the receiving side learns that the preparation for receiving the image signal is completed, and moves on to transmitting the image signal (30b).

Figure 1 (C) is the communication procedure after the @ sutra manuscript, and Figure 1 (
In C), after sending both signals from the sending side and the final manuscript (I
C), RTC transmission method 3c).

Send an end-of-procedure signal (EOP) (5C) to notify the receiving side that it is the final manuscript. The receiving side detects EOP6c), knows that it is the final manuscript, and sends the MCF7C), waits for the DCN signal, and sends the MCF.
After detection (8C), send digital command signal (DCS) 9
C) The line is switched from facsimile to telephone, and one communication ends (lie).Similarly, ACN is detected on the receiving side.10c) The line is switched to telephone, and 1irlJ communication ends (12C).

FIG. 1(d) shows the communication procedure at the time of transmission speed fallback.

After the first image signal transmission is completed and the RTC is transmitted, the MP
S/EOM is sent (15d), but the receiving side checks the image quality (7d). If the image quality is poor, it sends a retrain negative signal (RTN) instead of MCF and sends the current original to the sending side. On the sending side, since RTN was detected, in order to increase the transmission speed of both signals for the next document compared to the previous document,
Send DC3 again 11d), and training-T
When transmitting with the CP 13d), have the receiver check that the transmission speed has changed and check the receiver's modem training. If the check is OK on the receiving side, it transmits the CFR and proceeds to receive the image signal of the next original (15d).

In the facsimile communication system according to the T.30 recommendation described in L.
The protocol takes time flJI. For this reason, when communicating a large number of original documents or communicating with a long distance, there is a drawback that the communication cost becomes high.

〔the purpose〕

The present invention aims to eliminate the drawbacks of the above-mentioned conventional example, shorten the time required for communication procedures, and reduce one communication cost.

〔Example〕

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

FIG. 2 is a block diagram showing the overall configuration of an embodiment of the present invention. In FIG. 2, 1 is a central control circuit.

Controls facsimile communication equipment.

2 is a network control device (N(, F), and the NCU 2 switches between telephone line a and a telephone, or between telephone line a and a facsimile, by a switching command signal output from the central control circuit l via a signal line C. Switch the connection with the device.

3 is a telephone.

4 is a tonal signal circuit;
detects and transmits tonal signals.

5 is a switching circuit, and the switching circuit 5 is connected to the central control bag 2t.
The control signal modem 6 and the image signal modem 7 are switched in response to a modem switching command signal outputted from the signal line f from tl.

When the switching circuit 5 receives a 300 bps binary signal or image signal, it sets the signal line SED to H level,
300 bps binary signal. If both signals are not received, set the signal @SED to L level.

6 is a control signal modem, and the control signal modem 6 modulates and demodulates a binary signal at a transmission rate of 300 bps.

7 is an image signal modem, and the image signal modem 7 modulates and demodulates the image signal and the EOP signal transmitted at the same speed as the image signal.

Further, when the image signal modem 7 receives an image signal, it connects the signal line C.
D is set to H level, and when no image signal is received, signal line CD is set to L level.

Further, the image signal modem 7 sets the signal line FAIL to the H level when receiving the 300 bps binary signal, and sets the signal line FAIL to the L level when not receiving the binary signal.

Reference numeral 8 denotes a reading circuit, which reads the original.

A recording device 9 records the received image signal and copies the original.

IO is a memory that stores control programs for the central control circuit 1 and information regarding facsimile communications.

3 and 4 are flowcharts showing control operations of the central control device 1, with FIG. 3 being a flowchart on the transmitting side and FIG. 4 being a flowchart on the receiving side.

First, the control operation on the transmitting side will be explained.

In step SO of FIG. 3, when transmission is started, the reception of DIS is waited for in Sl, and when DIS is received, the process proceeds to 52, in S2 the DIS is stored in the memory, and then in step S3 the transmission mode is changed. Set, D
Set the transmission mode on O5.

Sends DO5 in S4, sends training and TCP in S5, confirms CFR reception in S6, and continues 34. until CFR is received. S5.36 is repeated, and when the CFR is received, the process proceeds to 37.0 or more are the pre-procedures from the start of transmission to the transmission of the first image signal.

When reception of CFH is confirmed in step S6, S
Proceeding to step 7, training is first transmitted in S7, and then an image signal is transmitted.

When the transmission of the image signal for one document is completed, the process advances to 38, and the process proceeds to S8.
The RTC is sent at

Next, the process proceeds to 39, where confirmation of MCF reception is performed, and if the MCF has not been received, the process proceeds to 316, and at 516, the RTN
Confirm receipt of.

If RTN is not received, return to S9.

When RTN is received, proceed to 517, MCF or RTN
is received in S9. S16 is repeated but S9
When MCF reception is confirmed in
At tO, the presence or absence of the next original is detected, and if there is a next original, Sl
If there is no primary document, the process advances to S21.

In step Sll, it is confirmed whether the mode is changed or not, and if the mode is changed, the process advances to S12 and the DIS
is read from the memory IO, the transmission mode is set in Si2, the DCS is transmitted in S14, CFR reception a is confirmed in S15, and Si2. When S15 is repeated and the CFR is received, the process returns to 57 and the image signal is transmitted.

Further, if it is not a moto change in step Sll, the process returns to S7 and the image signal is transmitted.

In step S16, RTN reception is confirmed and S
When the process proceeds to step 17, the presence or absence of the next original is detected in step 517, and if there is a primary original, the process proceeds to step S18, and if there is no next original, the process goes to step 32.
Go to 1.

In step S1B, the transmission speed of the previous document is read from the memory 10, and fall pack is performed in 519, and the process proceeds to S20.

In step S20, it is confirmed whether or not it is a mode change. If the mode is not changed, the process returns to S7 and an image signal is transmitted, and if the mode is changed, the process proceeds to S12.

Step S10. If there is no primary manuscript in S17, 5
21, in S21, transmit the DCN, and in S22
At step 323, the telephone line is switched from the facsimile machine side to the telephone set, and the transmission ends at step 323.

Next, the control operation on the receiving side will be explained.

When reception starts at step RO in Figure 4, R
Proceed to step 1, transmit CHD in R1, transmit DIS in R2, confirm DO3 reception in R3,
R2 and R3 are repeated until DOS is received, and when DCS is received, the process advances to R4.

In step R4, training and TCP reception are confirmed, and when training and TCP are received, the process proceeds to R5.

In step R5, the modem is equalized and a training check is performed, and the process proceeds to R6. In R6, it is confirmed whether the training check is OK. If the training check is OK, the process proceeds to R7, and the training check is OK.
Otherwise, return to R4.

In step R7, the receiving mode is set and the process proceeds to R8. In R8, when the CFR is transmitted, the process proceeds to R9.

In step R9, 10 sec is set in the software register T2, and in R10, Ams is set in the software register FCDCDT, and the process proceeds to Sll. A is each transmission speed Cex, 9600 bps, 720
0bps, 4800bps.

The T.3o recommendation recommends the following regarding the transmission time of the training signal received immediately before the image signal (2400 bps).

In the case of 9600 bps; A= 253 (m
s) For 7200 bps; A= 253 (
ms) 4800bps (7) Case; A=913~
933 (ms) 2400bps (7) Case: A
=l149~1169 Cm5) In step Sll, it is checked whether the signal line SED is at H level for 20 m5 consecutively, and if SED is at H level, R1
The process proceeds to step 5, and if SED is at L level, the process proceeds to R12.

In R12, it is checked whether T2 has timed out, and if T2 has timed out, it ends with an error in R14, and if T2 has not timed out, it proceeds to R13 and R1
In step 3, it is confirmed whether the signal line FAIL is at H level for 2 ms continuously, and if FAIL is at H level, the process goes to R28, and if FAIL is at L level, the process goes to R1.
Return to 1.

In step R15, it is confirmed whether or not the signal line CD is at the L level continuously with the Ams set in FCDCDT. If CD is at the L level, the process proceeds to R19, and if CD is at the H level, the process proceeds to R16.

In step R16, it is checked whether T2 has timed out, and if T2 has timed out, R18
Proceeds to error and ends, and if T2 is not timed out, R
Proceed to 17 and continue for 20m5iil at R17 - (F
Check whether A I L is at H level, and
If AIL is at the H level, the process advances to R28, and if FAIL is at the L level, the process returns to R15.

When the CD is at the L level in step R15 and the process proceeds to R19, it is confirmed in R19 whether the CD is at the H level for 20 m5 consecutively, and if the CD is at the H level, R
The process proceeds to step 23, and if the CD is at L level, the process proceeds to R20.

In step R20, it is checked whether T2 has timed out. If T2 has timed out, the process proceeds to R22 and ends with an error. If T2 has not timed out, the process proceeds to R21. In R21, FAII is at H level for 20m5 consecutively. If FAIL is at H level, the process proceeds to R28, and if FAIL is at L level, the process returns to R19.

When CD is at H level in step R19 and the process proceeds to R23, image signal reception is performed in step R23, and image signal reception is performed in step R24 until RTC is received.

When RTC reception is confirmed in step R24, R25
The process proceeds to R25, where the image quality is checked, and if the image quality is good, the process proceeds to R26, and if the image quality is poor, the process proceeds to R36.

In step R26, it is checked whether the image signal reception preparation is complete, and when the image signal reception 2m preparation is completed, the process proceeds to R27, where the MCF is transmitted, and the process returns to R9 to receive the next document.

Also, if the image quality is poor in step R25 and the process goes to R36, it is checked in R3B whether the preparation for receiving the image signal is completed, and when the preparation for receiving the image signal is completed, the process goes to R37, and the process goes to R36.
In step 37, the transmission speed of the previous document is read from the memory 10, and in R38, fall pack is performed, and in R39, RTN is transmitted, and the process returns to R9 to receive the next document.

In steps R13, R17, and R21, it is confirmed that FAIL is at H level, and the process proceeds to R28. In R28, the 300 bps binary signal reception mode is set, and the process proceeds to R29. In R29, the echo CFR (CFR transmitted by the receiving side is reflected). If it is received by the facsimile machine on the receiving side, it is checked again whether or not the CFR is received. If an echo CFR is received, the process returns to R11, and if no echo CFR is received, the process proceeds to R30.

In step R30, it is determined whether DO5 is received.

When DO5 is received, the process proceeds to R31, and R
At step 31, the reception mode is set and the next document is received.The process returns to step R8.

Also, if DO3 is not received in step R30, R3
Proceed to step 2, and in R32 echo MCF/RTN (MC when the MCF or RTN transmitted by the receiving side is reflected and received again by the facsimile machine on the receiving side)
F or RTN) is received.

When an echo MCF/RTN is received, the process returns to R11, and if an echo MCF/RTN is not received, the process proceeds to R33.
3, it is checked whether DCN is received or not, and if DCN is not received, it returns to R2B, and when DCN is received, 13
4, the telephone line is switched from the facsimile machine side to the telephone side at R34, and the reception ends at R35.

FIGS. 5(a) to 5(d) show the communication procedure when transmitting and receiving multi-pages in this embodiment when there is no mode change.
FIG. 7 is a diagram showing the procedure after the final document and the procedure at the time of transmission speed fallback in order when there is a mode change.

FIG. 5(a) is a diagram showing the communication procedure when there is no mode change. Diagram (a)
This is the same as up to 12a. At this time, in FIG. 3, it is step S7, and in FIG. 4, training is received in step R11 and the process proceeds to step R15. Since the training is received in R15, CD is L and it is confirmed that the health is healthy, so the process proceeds to R19. R19 until 1 picture signal is received
, R20, and R21 are repeated.

The image signal of the first original is transmitted (Fig. 5(a) (7)
) l'a) and Fig. 4+7) In R19, the CD is confirmed to be at H level, and the process proceeds to R23, where the image signal is received (Fig. 5(a)
), 2'a), when the sending side finishes transmitting the image signal of the first document, the RTC is sent (3'a in Figure 5(a)).
, the RTC is received on the receiving side (a'a in Fig. 5(a)
) and the image quality is checked in R25 in Figure 4. Receiving preparation is confirmed in R26, and the MCF is transmitted in R27 (5th
5'a) a) At this time, the transmitting side repeats steps 39 and 316 in FIG. 3.

When the MCF is received (6'a in FIG. 5 (&)), the presence or absence of the next document is checked at 510 in FIG. is transmitted (τa in FIG. 5(a)), and an image signal is transmitted (8'a in FIG. 5(a)), thereby causing the control signal modem 6 to switch to vJ in the protocol between the originals. Since 300 dps binary signals are not received, MPS transmission and reception can be omitted, and the time required for the protocol can be shortened.

FIG. 5(b) is a diagram showing a communication procedure when there is a mode change, and in this case, the communication speed mode and high quality mode are changed by an operator's operation.

In Figure 5(b), up to MCF reception (6'b) is the same as up to MCF reception (6'a) in Figure 5(a),
At this time, the transmitting side is step Sit in FIG. 3, and the receiving side is step R9 in FIG. 4.

On the transmitting side, a mode change is detected at step Stt in FIG. 3 (7'b in FIG. 5(b)) and S12.
S13. Proceeding to S14, DO3 is transmitted (Fig. 5 (
a'b) of b).

Also, on the receiving side, proceed as R9, RlO, R11 in Fig. 4,
Since DC5 is received, R11°R15, R19, R2
Proceeds to 0, R21, confirms that FAIL is at H level in R21, proceeds to R28, R29, R30, and D at R30.
O5 reception (9'b in Figure 5(b)) was confirmed, and R31
The reception mode is set (10'b in Figure 5(b)).
, CFR is transmitted in R8 (ll'b in Fig. 5(b)
).

Next, on the transmitting side, the CFR is received at S15 in FIG. 3 (12'b in FIG. 5(b)) and the training is transmitted (FIG.
13'b) of b), transmission of image signal (14 of Fig. 5(b))
'b) is performed.

This allows the transmission and reception of EOM to be omitted.

Furthermore, by performing mode setting on the receiving side, training and TCP can be omitted.

FIG. 5(C) shows the communication procedure after the final manuscript, and up to MCF reception (6' c ) in FIG. 5(e), McF reception a(a) in FIG. 5(a) is shown. Repeat up to 6'a), at this time the transmitting side is step SIO in Figure 3,
On the receiving side, step R9 in FIG. 4 is performed.

On the sending side, the presence or absence of the next manuscript is checked at SlO in Figure 3, and since it is after the final manuscript, the process advances to S21, where a DCN is sent (7'c in Figure 5 (C)), and a telephone call is made in S22. The line is switched from the facsimile machine side to the telephone side (5th
9'C in figure (c)) Communication ends.

Also, on the receiving side, R9 and RIO in FIG.

Proceeds to R11, and since DCN is received, R15, R1
9, R20, R21, R28, R29, R30, R32
, R33 and confirmation of DCN reception is performed (see Figure 5).
8'c) of C).

At R34, the telephone line is switched from the facsimile machine side to the telephone side (10'C in FIG. 5(C)), and the communication ends.

This allows the transmission and reception of EOP to be omitted.

FIG. 5(d) is a diagram showing the communication procedure at the time of transmission speed fallback.
' Same as up to a), at this time the sending side performs step 59.
．． 516 is repeated, and the receiving side goes to step R25.

On the receiving side, the image quality is checked at R25 in Figure 4 (
5'd) in Figure 5(d), R36, R3 due to poor image quality.
7, R38 and a fallback is performed (Fig. 5 (d)
6'd) of ), RTN is transmitted in R39 (Fig. 5(
d) of τd).

Also, on the transmitting side, RTN reception is confirmed at 516 in FIG. 3 (8'ci in FIG. 5(d)), and 517, S18, 5
19 and fallback is performed (Figure 5(d))
9'd), and 520.57, where training transmission (10'd in FIG. 5(d)) and image signal transmission (it'd in FIG. 5(d)) are performed.

This allows the transmission and reception of MPS or ROM to be omitted.

In addition, by falling back using DIS stored in the memory 10 on the transmitting side and the receiving side, respectively, DC3,) training and TCP.

Transmission and reception of CFH can be omitted.

Training and TCP transmission/reception can be omitted.

As described above, by switching the modem of the facsimile machine to the single picture signal modem 7 after the pre-communication procedure is completed, and switching to the control signal modem 6 only when a 300 bps binary signal is received, MPS, EOM, Control signals such as EOP can be omitted, and the image communication protocol can be shortened.

〔effect〕

As explained above, the present invention has excellent effects in that it is possible to shorten the time required for the communication procedure of image communication and to reduce the cost of image communication.

[Brief explanation of drawings]

FIG. 1(a) is a multi-page procedure sequence diagram when there is no mode change according to the conventional T.30 recommendation. FIG. 1(b) is a multi-page procedure sequence diagram when there is a mode change according to the conventional T.30 recommendation. FIG. 1(c) is a sequence diagram of the procedure after the final manuscript according to the conventional T.30 recommendation. FIG. 1(d) is a diagram showing a procedure at the time of transmission speed fallback according to the conventional T-30 recommendation. FIG. 2 is a block diagram of this embodiment. Fig. 3 is a flowchart of the transmitting side, Fig. 4 is a flowchart of the receiving side, Fig. 5(a) is a sequence diagram of the present embodiment without mode change, and Fig. 5(b) is the present embodiment. FIG. 5(c) is a sequence diagram of the communication procedure after the final manuscript in this embodiment. FIG. 5(d) is a sequence diagram of the communication procedure at the time of transmission speed fallback in this embodiment. 1 is a central control circuit, 2 is an NCU, 3 is a telephone, 4 is a tonal signal circuit, 5 is a switching circuit, 6 is a binary signal modem, 7 is an image signal modem, 8 is a reading circuit, 9 is a recording circuit, I
O is memory, a is telephone line, b, c, d, e, f, g,
h. SED, CD, and FAIL are communication lines, and i is a data bus. Discipline 1 Figure ((1) Figure 5 (b)

Claims (1)

[Claims] In the image communication device, a storage means for storing communication information;
It has a setting means for setting a communication mode, and when changing the communication mode during image communication of a plurality of documents, the communication mode is set based on the communication information stored in the storage means, and image communication is performed. An image communication device characterized in that training and training check, which are protocols of the above, are omitted.