JPH04294678A - Modem device for facsimile equipment - Google Patents

Abstract

PURPOSE:To suppress burden on a main control processor and to control facsimile equipment at high speed. CONSTITUTION:Command information (1) to be processed, reference data (2) for judgement, and command information (3) to be processed next are sent from a CPU 10 to a modem processor 3. Sent information are stored in a RAM 5 via a switching part 9. The MPU 4 of a modem block 3 executes the command information (1) read out from the RAM 5, and judges an execution result based on the reference data (2) for judgement, and executes the command information (3) to be processed next, and reports the execution result to the CPU 10 as interruption information.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a modem device for a facsimile machine that more efficiently controls the facsimile machine.

0002

2. Description of the Related Art The format and procedures of facsimile communications have been internationally standardized. Before communication of image data begins, the sender and receiver must communicate with each other regarding the functions of the devices used, communication speed, and other conditions to ensure consistency. Even during communication, the protocol, which is a procedure for exchanging confirmation signals and the like, plays a major role.

[0003] CCITT Recommendation T. 30, the protocol procedure from the start to the end of facsimile is roughly divided into five stages, Phase A to Phase E below.

[0004] Phase A is a call setting sequence from calling the other party to establishing a line. Phase B is the pre-message procedure. Identification sections such as group identification, reception confirmation, optional subscriber identification, non-standard function identification, group commands, training, synchronization, non-standard function commands, subscriber identification commands, polling commands, transmission line adjustment It consists of a command section containing options such as. Phase C includes in-message procedures such as in-message synchronization, error detection and correction, and transmission path monitoring, which are performed simultaneously with message transmission, and message transmission procedures. Phase D involves completing the message and confirming receipt. In the case of continuous transmission of a plurality of pages, the process returns to phase B or phase C and the transmission is repeated. Phase E is a call release procedure, in which the line is disconnected.

[0005] The flows of phases A and B will be explained in more detail. FIG. 2 shows the flow on the sending side. The flow is started by lifting the handset or pressing down on the send key. Step1,
In Step 2, check the dial tone and dial. In Step 3, send CNG (1100Hz) and
At ep4, wait for CED (2100Hz) from the receiving side. If CED is not received within a certain period of time, Step 5, S
In step 6, disconnect the line. This is Phase A.

[0006] Entering phase B, in Step 7, command information is received. If it is a signal other than DIS that is sent after CED and informs the receiving side of the function menu,
The process goes to Steps 13 to 18, and if it is a GI signal, it goes to a tonal procedure, if it is an NSF signal, it goes to a non-standard procedure, and when either one of them is the case and time T1 seconds has passed, it goes to Step 9 and disconnects the line. Steps 8 to 12 are a process in which mutual transmitting and receiving devices confirm whether the transmitting and receiving relationships are consistent with each other according to the G2 group standards.

[0007] In Step 19 and Step 20, the DC informs the function mode of the sending side selected from the DIS menu.
S allows the functional modes of each device to match. Ste
Steps 21 to 26 are the process of matching the receiving side device to the transmitting side device and line, in which the sending side sends a TCF signal for phase adjustment/training in Step 21, and the St.
We will wait for the results in ep22. The receiving side sends a CFR signal to the transmitting side if the reception result is good, and an FTT signal if it is bad. When reception preparation is completed, phase C begins.

[0008] If the phases do not match during training, S
The process loops from step 23 to step 19, repeating up to three times, and if a good result is not obtained, the process moves to the flow of FIG. 3, where a line disconnection command is issued at step 29, and the line is disconnected at step 30. In Step 8, if a DTC command to transmit to the other party is issued, in Step 12, the receiving state is set and the receiving procedure begins.

FIG. 4 shows the receiving side. The flow starts when there is an incoming call. Generate a bell sound in step 31, respond in steps 32 and 33, and
Send CED at p34. This is Phase A.

[0010] In Step 35, DIS is sent and phase B is entered. In Step 36, a response to the DIS from the transmitting side is awaited, and the process proceeds to Step 38. If there is no transmission request from the transmitting side, proceed to Step 40, send the DCS, and proceed to Steps 41 and 42 according to the function mode of the transmitting side.
Then, perform training, and if the training result is good, CFR in Step 43, and if it is bad, F in Step 44.
Send TT to the sender. Returning to Step 37, if there is no new command from the sending side and a message carrier arrives within T2 seconds at Steps 45 and 46, training is performed at Step 47 and the process enters Phase C.

[0011] If a signal indicating a condition other than the DIS response is received in Step 36, the process from Step 51 to St.
Enter the ep55 procedure, and if it is a GC signal, go to the tonal procedure,
Also, if no response is obtained even after repeating DIS transmission three times, an unspecified procedure is entered, and either time T1
When the second has elapsed, the process moves from Step 55 to the flow shown in FIG. 3 and the line is disconnected.

[0012] These processes are normally handled by the main control processor (CPU), but a considerable portion is carried out by the modem (
The main control processor frequently accesses the modem by setting commands and reading status. The higher the transmission speed required, the more times the modem will be accessed, the more overhead the main control processor will have, and the response to a single task will tend to be worse. Normally, in order to compensate for this drop in response, a system is configured using multiple main control processors or a main control processor capable of high-speed calculation processing.

[0013]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides a modem device for a facsimile machine that can reduce the burden on the main control processor and control the facsimile machine at high speed. The purpose is to

[0014]

[Means for Solving the Problems] The present invention provides at least the following:
Random access storage means RAM, control processor M
In a modem device for a facsimile device having a PU,
The RAM stores command information to be processed, judgment reference data, and command information to be processed next, received from the main control processor CPU of the facsimile machine, and the MPU stores the executed results as interrupt information or The present invention is characterized in that the status information is transmitted to the CPU.

[0015] In a period other than the facsimile message sending or facsimile message reception phase, during which the overhead is large for the main control processor, the CPU transmits command information to be processed by the modem device for the facsimile machine, judgment reference data, Then, command information to be processed next can be sent.

[0016] The CPU determines the command information to be processed by the facsimile modem device for timing adjustment when transitioning from low-speed data transmission to high-speed data transmission and subsequent detection of a response reception signal from the receiving side. It can be sent as standard data for use and command information to be processed next.

Regarding the training, the CPU determines whether the received data is low speed or high speed, and sends out a reply response signal.The CPU provides command information to be processed by the modem device for the facsimile device, reference data for determination, and Command information to be processed next can be sent.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic diagram of the main parts of an embodiment of a facsimile machine using a facsimile modem device (hereinafter referred to as a modem block) of the present invention. In the figure, 1 is a telephone line, 2 is a line control unit, 3 is a modem block, 4 is a modem processor (hereinafter referred to as MPU), 5 is a RAM, 6 is a ROM, 7 is a program data bus, 8 is a data bus, 9 is a switching unit, 10 is a main control processor (hereinafter referred to as CPU), 11 is a RAM, 12
is a ROM, and 13 is a main data bus.

The modem block 3 is central to executing protocol procedures more efficiently, and is
The M5, ROM 6, program data bus 7, data bus 8, switching section 9, etc. are integrated into an LSI, and are switched by the switching section 9, and the whole is stored in the RAM 11 and ROM 12 via the main data bus 13. It is controlled by the CPU 10 in accordance with the programs and data that are being used. By integrating the switch including the switching section 9, wiring can be simplified and access by the CPU 10 can be made faster.

Command information (2) to be processed by the modem block 3, judgment reference data (2), and command information (2) to be processed next are sent from the CPU 10 to the RAM 1.
1. Read from ROM 12, etc., and read from CPU 10 to MP
In response to an instruction from U4 and the switching section 9, the switching section 9 is switched, and the data is transferred from the main data bus 13 via the program data bus 7 to the RAM 5 and stored. When writing to the RAM 5 is completed, a RAM writing completion signal is transmitted from the CPU 10 to the MPU 4. MPU4 is RA
Upon receiving the M write completion signal or operation start signal, execute the command information (■) read out from the RAM 5, judge the execution result based on the judgment reference data (■), and select the command information (■) to be processed next. Alternatively, the execution result or judgment result is reported to the CPU 10 as interrupt information or status information.

[0021] In this way, for each step of the protocol procedure, the command information to be processed ■, the reference data for judgment ■, the command information to be processed next ■ are transferred from the CPU 10 to the RAM 5, and the commands of the MPU 4 are transferred. execution of,
Reporting to the CPU 10 is repeated. If a series of processes are performed consecutively, after ■■■ has been transferred, ■
Only ■ may be repeated.

The modem block 3 has the following basic functions:
a) CCITT Recommendation V. 17, V. 33, V. 29,
V. 27, V. (b) a noise filtering function to be superimposed on the facsimile signal, and
It has a function of correcting loss and distortion in the line, and (c) a function of detecting and transmitting a single tone or mixed tone, but in the present invention, in addition to this basic function, the above-mentioned processing function It is made to have.

The tasks suitable for the modem block 3 are, in transmit mode, dial tone detection, monotone/
There is detection of low frequency signals such as detection of mixed sounds, time elapse management, etc., and these can be said to be heavy processing for the CPU 10 during document reading, recording, and decoding processing.

[0024] Processes to be performed during the period in which overhead is large for the main control processor other than the facsimile message sending or facsimile message receiving phase, timing adjustment when transitioning from low-speed data sending to high-speed data sending, and subsequent receiving side. Detection of response received signals from , or judgment of whether received data is slow or fast regarding training,
It is effective to have the modem block take over the task of sending out the reply response signal.

The flow of these parts to which the present invention is effectively applied will be explained with reference to FIGS. 2 to 8. ■■
(2) corresponds to the above-mentioned command information to be processed, judgment reference data, and command information to be processed next.

FIG. 2 shows the case of transmission. (2-1) Phase A dial tone detection procedure. Step1
, in Step 2, the command information ■ is a command to raise the handset (close the DC circuit). When the command is executed, a dial tone is returned. Therefore, the judgment reference data (2) is a reference signal for dial tone detection. The next command to be processed is to send a dial signal and CNG if a dial tone is detected, and to wait if no dial tone is detected. Below, this will be described as ■Closing the DC circuit. ■ Reference data for dial tone detection ■ If a dial tone is detected, a dial signal and CNG are sent; if not detected, wait. It shall be written as follows.

(2-2) In Steps 3 to 6, ① CED signal reference data ② If CED is present, check the command signal. If there is no CED, CNG will continue to be sent. ■Specified time without CED signal ■Disconnect the line after the specified time.

(2-3) In Step 7, ■DIS
, DTC, GI, NSP reference data■DIS or D
If you have TC, proceed to Step 8. Once GI is detected, proceed to the tonal procedure. If you receive an NSP request, proceed to non-standard procedures. If neither is true, send out CNG and go to Step 7.

(2-4) In Steps 21 and 22, which is the training response confirmation procedure, (1) Send the phase adjustment and training TCF. ■Determination data of response data from receiving side■If there is response data, proceed to Step 24. Without response data,
Proceed to Step 23.

FIG. 3 shows the line disconnection procedure. (3-1) In Steps 29 and 30, send ■DCN. ■Tone data from the line■If you detect dial tone data, report the disconnection.

FIG. 4 shows the case of reception. (4-1) In Steps 31 to 33, detect the incoming bell signal. ■Incoming bell signal data■Respond if an incoming bell signal is detected. If you have a recorded response, please respond by recording. If no ringtone is detected, just wait.

(4-2) Step 35, 3 of Phase B
6, 51, and 52, ① Send DIS and check the response from the sending side. ■Response judgment data ■If the response data is DIS or DTC, Step 38
Proceed to. When the GC signal is detected, enter the tonal procedure. If neither is the case, return to Step 35 again and send DIS.

(4-3) In Steps 53 to 55, (1) Limit of number of times of DIS transmission, T1 time (3) If no response is repeated three times, enter the non-standard procedure. If T1 time has passed without a response, proceed to Step 29 in FIG. 3.

(4-4) Training confirmation procedure S
In steps 40 to 44: 1. Perform phase adjustment and training according to the determined function mode, and receive the TCF. ■Phase adjustment, training judgment data ■If the judgment result is good, send CFR, if bad, send FTT.

(4-5) Steps 37, 45, 46, 4
In step 7, after sending CFR and FTT, ■Response command data, T2 time, message carrier data ■If there is message carrier data, perform phase equalization training and enter phase C. If no message carrier is received, return to Step 37. After T2 time has passed, proceed to Step 48.

FIG. 5 is a flowchart of response reception in Step 22 of FIG. 2, which is a time management procedure in which a response is confirmed on the receiving side in response to a response signal from the transmitting side at the beginning of phase B. (5-1) In Steps 56 to 59, check the flag indicating ① response. ■Flag data, timer time 4 seconds ■If the flag is not detected within 4 seconds, step 22
Move to “No”. If the flag is detected, confirm frame reception.

(5-2) If the flag is detected in Step 56, (1) Frame reception data (2) If a frame is received, detect FCS, and if no frame is received, check the presence or absence of a signal.

(5-3) In Steps 60 to 62, (1) Signal judgment data (2) Determine that there is no response after the signal disappears and 0.2 seconds later. Step 70 if there is no frame reception for 3 seconds even if there is a signal
Proceed to.

FIG. 6 shows the flow of command reception in Step 37 of FIG. 4, and is a time management procedure in which the transmitting side confirms the command in response to the command signal from the receiving side at the beginning of phase B. (6-1) In Steps 72 to 75, check the flag indicating that there is an instruction. ■Flag data■If there is a flag, reset the 6-second timer and confirm frame reception. If there is no flag, determine that there is no command. ■Frame reception data■If a frame is received, check for transmission errors. If no frame is received, proceed to Step 76.

(6-2) In Steps 76 to 78, (1) Check the presence or absence of a signal. ■Signal Judgment Data■If there is no signal, determine that there is no command after 0.2 seconds. Even if there is a signal, if no frame is received for 3 seconds, determine that there is no command signal.

FIG. 7 shows the procedure for determining the signal data rate for the protocol used in Phase B on the transmitting side. Start from where you entered Phase B.

Further, FIG. 8 starts from entering phase B in the procedure for determining the signal data rate on the receiving side.

[0043] In these procedures as well, appropriate operations can be assigned to the modem blocks.

Note that the above-mentioned operation is similar to that of T. 30 protocols are taken as an example, and it is clear that the present invention is not limited to this flow. The commands and judgment reference data to be assigned to the modem blocks are also examples, and are not limited to the above-mentioned contents.

As mentioned above, the MPU 4 can receive only the information necessary for the current state from the CPU 10, which stores the entire operation of the facsimile.
The storage capacity for operations other than basic operations is also small, and the results processed by the MPU 4 are stored in the CPU each time.
The next process becomes possible without waiting for the judgment of U10. Therefore, waiting time is reduced, and as a result, high-speed processing becomes possible.

[0046]

Effects of the Invention As is clear from the above description, according to the present invention, the modem block can be controlled by a control procedure with a short waiting time for procedures that would slow down the overall processing if performed by the CPU. By sharing C.
This has the effect of providing a modem device for a facsimile machine that can reduce the load on the PU and control facsimile machines at high speed.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a main part of an embodiment of a modem device for a facsimile machine according to the present invention.

FIG. 2 is a flowchart illustrating an embodiment of the operation at the time of transmission of the present invention.

FIG. 3 is a flowchart illustrating an embodiment of a line disconnection operation according to the present invention.

FIG. 4 is a flowchart illustrating an embodiment of the operation at the time of reception of the present invention.

FIG. 5 is a flowchart illustrating an embodiment of a response receiving procedure of the present invention.

FIG. 6 is a flowchart illustrating an embodiment of the instruction receiving procedure of the present invention.

FIG. 7 is a flowchart illustrating an embodiment of the transmission code rate determination procedure of the present invention.

FIG. 8 is a flowchart illustrating an embodiment of the reception code rate determination procedure of the present invention.

[Explanation of symbols]

1　Telephone line 2 Line control section 3 Modem block 4 Modem processor MPU 5 RAM 6 ROM 9 Switching section 10 Main control processor CPU

Claims (1)

[Claims] 1. A modem device for a facsimile machine comprising at least a random access storage means RAM, a control processor MPU, the RAM receiving from a main control processor CPU of the facsimile machine;
Command information to be processed, criterion data for judgment, and
Stores command information to be processed next, and the MPU:
A modem device for a facsimile machine, characterized in that the result of execution is transmitted to the CPU as interrupt information or status information.