JP3157857B2 - Facsimile machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile apparatus for receiving a response.

[0002]

2. Description of the Related Art Conventionally, a facsimile apparatus has received a response according to CCITT Recommendation T.30. 30, there is no provision regarding the response reception at the time of the advance telephone call from the receiving side, and the response reception in the pre-procedure of the transmitting side is the case where the response cannot be received and the case where DIS or DTC is detected. In some cases, it is described that a judgment of three independent trials is executed, and it is not clear.

[0003]

Therefore, in the case where a valid procedure signal for moving to the next step cannot be obtained in response reception, a problem as shown in FIG. 4 has occurred.

That is, as shown in FIG. 4A, the receiving terminal repeatedly sends a CRP (command retransmission signal) to the TSI / DCS from the transmitting terminal for some reason, and terminates communication with each other. And the line is put on hold for a long time.

As shown in FIG. 4B, the receiving terminal changes the 10th bit (T.4 receiver display bit) in the second and subsequent DISs from 1 to 0 for some reason, Since the transmission is repeated, the transmitting side sets the DCS because the receiver indication bit in the received DIS is 0.
Are repeatedly transmitted, and communication is not terminated with each other, and the line is put on hold for a long time.

[0006] The above case is particularly an example of a trouble occurring on an international line, and has a drawback that the communication cost becomes abnormally large and the transmission is terminated due to poor transmission.

An object of the present invention is to provide a facsimile apparatus which can efficiently cope with a case where a valid procedure signal cannot be obtained in response reception.

[0008]

According to the present invention, there is provided a signal detecting means for detecting a signal from a partner apparatus in receiving a response, and the detecting means comprises NSF / CSI / DIS, NSC / CI
When a predetermined signal is transmitted when the G / DTC or CRP is detected and when no signal is detected, the line is disconnected after transmitting the predetermined signal a predetermined number of times, and when a predetermined second signal is detected. And control means for limiting the number of times of transmission of the predetermined signal per communication to the predetermined number of times by immediately disconnecting the line and, when a predetermined third signal is detected, shifting to the next operation. Facsimile machine having

[0009]

[0010]

FIG. 1 is a block diagram showing an embodiment of the present invention.

An NCU (network control unit) 2 connects to a terminal of the line in order to use the telephone network for data communication and the like.
It controls connection of a telephone exchange network, switches to a data communication path, and holds a loop. The NCU 2 connects the telephone line 2a to the telephone 4 when the signal level (signal line 32a) from the control circuit 32 is “0”, and connects the telephone line 2a when the signal level is “1”. It is connected to the facsimile machine side.
In a normal state, the telephone line 2a is connected to the telephone 4 side. Further, the telephone 4 sends a signal of level “0” to the control circuit 32 from the signal line 4a when on-hook, and sends a signal of level “1” to the control circuit 32 when off-hook.

The hybrid circuit 6 separates the transmission system signal and the reception system signal, sends the transmission signal from the addition circuit 16 to the telephone line 2a via the NCU 2, and receives the signal from the other party via the NCU 2. , To the V29 demodulator 20 and the V21 demodulator 18 via the signal line 6a.

The V21 modulator 8 is a modulator that performs modulation based on the known CCITT recommendation V21, modulates a procedural signal (signal line 32b) from the control circuit 32, and sends it to the addition circuit 16 through the signal line 8a. Is what you do.

The reading circuit 10 sequentially reads image signals for one line in the main scanning direction from a transmission original, and creates a signal sequence representing binary values of white and black. It is composed of an element and an optical system. The binary signal sequence of white and black is sent to the encoding circuit 12 from the signal line 10a.

The encoding circuit 12 encodes the read data (MH (Modified Huffman) encoding or MR encoding).
(Modified read), and outputs the result to the modulator 14 from the signal line 12a.

The V27ter or V29 modulator 14 modulates the encoded output from the signal line 12a of the encoding circuit 12 based on the known CCITT recommendation V27ter (differential phase modulation) or V29 (quadrature modulation). Is a modulator that performs the following. The output modulation data of the modulator 14 is sent to the addition circuit 16 through the signal line 14a.

The addition circuit 16 is a circuit for adding the outputs of the modulators 8 and 14. The output of the adding circuit 16 is sent to the hybrid circuit 6.

The V21 demodulator 18 performs demodulation based on the well-known CCITT recommendation V21. The demodulator 18 receives the procedure signal from the hybrid circuit 6 via the signal line 6a, performs V21 demodulation, and sends demodulated data to the control circuit 32 via the signal line 18a.

The V27ter or V29 demodulator 20 performs demodulation based on the known CCITT recommendation V27ter or V29. The demodulator 20 receives the modulated image signal from the hybrid circuit 6, performs demodulation, and sends demodulated data to the decoding circuit 22 via the signal line 20a.

The decoding circuit 22 is a circuit for decoding the demodulated data from the demodulator 20 (MH decoding or MR decoding). This decoded data is output to the recording circuit 24 via the signal line 22a.

The recording circuit 24 is a circuit for sequentially recording the decoded white and black signals output from the decoding circuit 22 line by line.

The telephone button 26 is a button used for calling a telephone. When this button is pressed, the signal line 2
A pulse signal is output to the telephone lamp 28 via 6a.

The telephone lamp 28 is turned on and off alternately each time a pulse signal is sent from the telephone button 26. Also, the control circuit 32 sends a signal line 32c.
Turns off by clear pulse output to When the light is turned off, the signal level “0” is output to the control circuit 32 from the signal line 28a, and when the light is turned on, the signal level “1” is output to the control circuit 32 from the signal line 28a.

The pseudo bell sound generating circuit 30 includes a control circuit 32
Does not generate a pseudo bell sound when the signal level "0" is output to the signal line 32d from the control circuit 32, and generates a pseudo bell sound when the signal level "1" is output from the control circuit 32 to the signal line 32d. It generates a bell sound.

The control circuit 32 controls the entire facsimile machine.

In this embodiment, the NSF / CSI / DIS, NSC / CI
When G / DTC or CRP is detected or no signal is detected, the line is disconnected by transmitting NSS / TSI / DSS and Tr-TCF three times, and when CFR or FTT is detected, the next operation is performed. When the signal of is detected, the line is immediately disconnected.

In response to a pre-call response upon transmission, NSF / CSI / DIS, NSC / CIG / DTC
Alternatively, when CRP is detected or no signal is detected, the line is disconnected by transmitting PRI-EOP three times. When PIP or PIN is detected, the process proceeds to the next operation. Dismiss.

Further, in this embodiment, the NSF / CSI
All the same counters are used as a retransmission counter used for retransmission of a signal when detecting / DIS and NSC / CIG / DTC, and a retransmission counter used for retransmitting a signal when CRP is detected or when no signal is detected. .

FIG. 2 is a flowchart showing response reception in a pre-procedure at the time of transmission.

In this case, NSF / CSI /
The operation of FIG. 2 is started by receiving the DIS.
First, the above-described retransmission counter is cleared (S42).
And NSS / TSI / DC via signal line 32b.
S, the Tr-TCF is transmitted (S44). Next, a response is received (S46), and if a procedure signal is received, if it is a CFR (S54), the procedure shifts to transmission of an image signal (S68). When FTT is detected (S
56) If the Tr-TCF can be retransmitted (S7)
0), the mode is set, and the process returns to S44 (S72).

On the other hand, in step S46, when the procedure signal is not received, NSF / CSI / DIS, NSC / CIG
/ DTC or CRP is received (S48, S48
50, S52), and increments the retransmission counter by one (S5).
8) If the counter value is less than 3 (S60), S44
Return to

When the value of the retransmission counter has reached 3, the DCN is transmitted (S62), the CML is turned off (S64), and the process is terminated. Also, if the Tr-TCF cannot be retransmitted in S70, the process ends in S62 and subsequent steps. Further, even when other signals are detected in S56, the process ends in S62 and thereafter.

FIG. 3 is a flow chart showing the reception of a response in the advance telephone at the time of transmission.

First, NSF / CSI / DI from the receiving side
It is assumed that S is received and the telephone lamp 28 is turned on. First, the retransmission counter is cleared (S73), and the PRI-EOP is transmitted via the signal line 32b (S7).
4). Next, a response is received (S76). When the procedure signal is received, if it is PIP or PIN (S84, S86), 15 seconds is set in the timer T3 (S98), and the signal is sent to the signal line 32d. The level "1" is output, a pseudo bell is sounded, and the operator is called (S100). If there is a response from the operator (S
102), PRI-EOP is transmitted (S106), and C
The ML is turned off (S94), the telephone lamp 28 is cleared (S95), and the pseudo bell sound is stopped (S96). Also,
If the timer T3 times out without an operator's response (S104), the DCN is transmitted (S104).
92), and perform the processing of S94 and subsequent steps (S94 to S96).

On the other hand, in S76, when no procedure signal is received, NSF / CSI / DIS, NSC / CIG
/ DTC or CRP (S78, S
80, S82), and increments the retransmission counter by one (S8).
8) If the counter value is less than 3 (S90), S74
Return to

When the value of the retransmission counter becomes 3, disconnection processing is performed in S92 and thereafter (S92 to S9).
6). If another signal is detected in S86, the process ends in S92 and subsequent steps.

In the above embodiment, the description has been given of the reception of the response from the transmitting side at the time of the advance telephone call and the reception of the response of the pre-procedure of the transmitter. However, the present invention may be applied to the reception of a signal of another procedure.

[0038]

According to the present invention, NSF / CSI / DI
When S, NSC / CIG / DTC or CRP is detected, the number of times of transmission of a predetermined signal to be transmitted per communication is limited to a predetermined number, thereby preventing a problem that communication is held for a long time. In addition, there is an effect that standardization of response reception at the time of prior call from the calling side is possible.

[Brief description of the drawings]

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

FIG. 2 is a flowchart showing the operation of the embodiment.

FIG. 3 is a flowchart showing another operation of the embodiment.

FIG. 4 is a schematic diagram illustrating a conventional operation.

[Explanation of symbols]

 2: NCU, 4: Telephone, 6: Hybrid circuit, 8, 14: Modulator, 10: Reading circuit, 12: Encoding circuit, 16: Addition circuit, 18, 20: Demodulator, 22: Decoding circuit, 24 ... Recording circuit, 26 ... Telephone button, 28 ... Telephone lamp, 30 ... Pseudo bell sound generation circuit, 32 ... Control circuit.

Claims (4)

(57) [Claims] 1. A signal detecting means for detecting a signal from a partner device in receiving a response; and the detecting means comprises: NSF / CSI / DIS, NSC / C
When the IG / DTC or CRP is detected and when the signal is not detected, a predetermined signal is transmitted, the predetermined signal is transmitted a predetermined number of times, and then the line is disconnected.
When a signal is detected, the line is immediately disconnected, and when a predetermined third signal is detected, the next operation is performed, thereby limiting the number of times of transmitting the predetermined signal per communication to the predetermined number of times. A facsimile apparatus comprising: 2. The method according to claim 1, wherein the NSF / CSI /
When DIS, NSC / CIG / DTC or CRP is detected or when no signal is detected, NSS / TSI / D
A facsimile apparatus in which a line is disconnected after three transmissions of CS and Tr-TCF, and when CFR or FTT is detected, the operation proceeds to the next operation, and when other signals are detected, the line is immediately disconnected. 3. The method according to claim 1, wherein the NSF / CSI
If / DIS, NSC / CIG / DTC or CRP is detected or no signal is detected, the line is disconnected by transmitting PRI-EOP three times, and if PIP or PIN is detected, the next operation is performed. A facsimile apparatus, wherein when a signal is detected, the line is immediately disconnected. 4. The counter according to claim 2, wherein the counter is used for retransmission when NSF / CSI / DIS or NSC / CIG / DTC is detected, and the counter is used for retransmission when CRP is detected or a signal is not detected. And a facsimile apparatus using a common counter.