JPH06181512A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To shorten the transmission time of a protocol by executing the procedure of the protocol at a high speed MODEM speed for picture signal transmission in a facsimile equipment for transmitting picture information by the procedure of a CCITTT 30. CONSTITUTION:When an NCU 9 detects a call signal, a CPU 1 controls the NCU 9 and closes a line to form a loop. Although a signal of 2000Hz is sent for >=2.6sec. as a called station signal (CED) in a normal T30 procedure, the following signal is sent in place of the CED in this CCITTT30 procedure. Namely the carrier frequency 1700Hz of V29 is sent when a high speed protocol follows the V29 or the carrier frequency 1800Hz of V27ter is sent in place of 210OHz CED when the high speed protocol follows the V27ter. Then NSF, DIS are sent by 9600bps for the setting of V29 or 4800bps for the setting of V27ter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile machine, and more particularly to a facsimile machine which shortens the time required for protocol control other than image information transmission and shortens the transmission time as a whole.

[0002]

2. Description of the Related Art Generally, CCIT is used for facsimile communication.
According to the protocol procedure of T T30, the transmitting side and the receiving side are synchronized and the image information is transmitted. In response to demands for higher transmission speed and lower running cost, various schemes have been made to reduce communication time such as preamble reduction and white skip method. Regarding this, for example, the technique disclosed in JP-A-64-62080 can be referred to. In this technique, in image information communication between two facsimile devices, when the mode is changed, the contents of the mode change are transmitted to the called station side by a signal notifying the end of page and the mode change. The training signal and the image signal can be immediately transmitted without repeating B, and the transmission time can be shortened.

[0003]

The above-mentioned prior art aims to improve the transmission speed only for the image information transmission part, and for the parts other than the image information transmission, the improvement of the transmission speed is considered. Absent. This is true of all other transmission rate enhancement methods proposed so far. However, in reality, CC other than the image information transmission, that is, the protocol portion
Due to the enhancement of unique functions that utilize the parts used for the unique functions of each manufacturer that are allowed in the ITT T30 protocol procedure, the tendency for protocol transmission time to become longer is becoming more prominent. This is because the CCITT T30 protocol procedure described above specifies a low-speed transmission of 300 bps for the purpose of accurately and reliably performing protocol control.
There is a cause. However, if it is left as it is, it leads to an increase in the communication time as a whole, which is a serious problem from the viewpoint of reducing the running cost. The present invention has been made in view of the above circumstances, and an object of the present invention is to solve the above-mentioned problems in the related art, shorten the time required for protocol control other than image information transmission, and transmit as a whole. An object is to provide a facsimile device that can reduce the time.

[0004]

The above object of the present invention is to provide C
The present invention is achieved by a facsimile apparatus for transmitting image information according to the CITT T30 procedure, which is provided with control means for performing a protocol procedure at a high speed modem speed for image signal transmission.

[0005]

In the facsimile apparatus according to the present invention, the protocol control before the start of image information transmission is performed at the modem speed (9600 to 2400 bps) used for image information transmission,
The protocol transmission time is shortened and there is a restriction that it can be used only between models with this function, but it should be used sufficiently for communication between relatively short distance devices such as on-premises facsimile. Is possible.

[0006]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a block configuration diagram of a facsimile apparatus according to an embodiment of the present invention. In the figure, 1 is a CPU that controls each part of the facsimile apparatus according to a program in a program storage ROM 2 to be described later, and executes the processing of the present invention, 2 is the above program storage ROM, 3
Is a RAM in which a work area is formed and stores various data necessary for controlling the facsimile device, 4 is a scanner for reading an original, 5 is a plotter for printing a copy or a received original, and 6 is a predetermined code for image information. A coding / decoding unit (DCR) 7 for coding according to a coding method and decoding the coded image information receives an operation from a user, and
An operation port for transmitting information to a user, 8 a modem for modulating a transmission signal and demodulating a reception signal, 9 a network control unit (NCU) for controlling a communication line, and L a telephone line.

The operation of communication between the facsimile machines configured as described above will be described below. First,
The operation on the receiving side will be described based on the operation flow shown in FIG. When the NCU 9 detects a calling signal from the exchange, the CPU 1 controls the NCU 9 to close the line and form a loop. In the normal T30 procedure, here, 2100 Hz, 2.6 seconds or more is transmitted as the called station signal (CED), but if the receiving side is a device having the function according to the present embodiment (step 41), Replace with 2100Hz CED,
Send the following signals. That is, when the high speed protocol complies with V29, the carrier frequency of V29 is 1700
Hz, or, if the high speed protocol complies with V27 ter, its carrier frequency of 1800 Hz, 210
Send it in place of 0Hz CED (steps 42-44), and then
When NSF and DIS are set to V29, it is 9600bps and V27t
In case of er setting, it is transmitted at 4800 bps respectively (step
45). An example of this is shown in FIG.

On the other hand, the operation of the transmitting side will be described based on the operation flow shown in FIG. On the sending side, dial call
After (step 51), the called station signal (CED) is detected by the tone detector in the modem 8 shown in FIG. When the signal frequency is 2100 Hz, it is judged to be the normal Vbp protocol procedure of 300 bps (steps 52, 54 and 56), and the modem 8 is set to the FSK mode. When the frequencies are 1700 Hz and 1800 Hz, the modem 8 is set to 9600 bps and 4800 bps, respectively (steps 54 and 55, 56 and 57), and then the high speed protocol signal (NSF, DIS) reception mode is entered. N
If SF and DIS can be received normally (step 58), frame check sequence (FCF) OK, NSS, DCS
Send the command (steps 60 and 62) to continue the operation, but if it is abnormal, set the modem rate to 7200bps or 240
Change the setting to shift down to 0 bps (steps 60 and 6)
1).

During this time, the receiving side monitors the reception of NSS and DCS (step 46). If NSS and DCS do not arrive, retry is performed three times in the normal V21 procedure, but after timeout, high speed transmission is performed. Shift down
(Steps 47, 49), 7200 bps or 2400 bps, NSF,
Resend DIS. After that, the protocol is performed at the modem rate when the FCF is OK, and the transmission of image information is started. Then, the protocol after the end of one page of image information and the protocol of the second page are also executed at the once determined high-speed modem rate. According to the above embodiment, between the devices having the high speed protocol function of this embodiment, the protocol of at least 8 times (2400 bps is 8 times of 300 bps) and 32 times at the maximum (9600 bps is 32 times of 300 bps) is used. Higher transmission time can be realized.

Further, in the facsimile apparatus according to the present embodiment, it is not necessary to add special hardware, and it can be realized by adding only software. Therefore, there is an advantage that the cost increase is extremely small. . It is needless to say that the above embodiment shows one example of the present invention, and the present invention should not be limited to this.

[0011]

As described above in detail, according to the present invention, it is possible to realize a facsimile apparatus which shortens the time required for protocol control other than image information transmission and shortens the transmission time as a whole. It has a great effect.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a facsimile apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing a transmission signal from a receiving side in the embodiment.

FIG. 3 is a block diagram showing a circuit configuration of a modem in the embodiment.

FIG. 4 is a flowchart showing an operation on the receiving side in the embodiment.

FIG. 5 is a flowchart showing an operation on the transmitting side in the embodiment.

[Explanation of symbols]

1: CPU, 2: ROM, 3: RAM, 4: Scanner,
5: plotter, 6: encoding / decoding unit (DCR), 7: operation port, 8: modem, 9: network control unit (NCU), L: telephone line.

Claims (4)

[Claims] 1. A facsimile apparatus for transmitting image information according to the CCITT T30 procedure, characterized by comprising control means for performing a protocol procedure at a high speed modem speed for image signal transmission. 2. The facsimile apparatus according to claim 1, wherein the start of the protocol procedure at the high speed modem speed is determined by the frequency of the called station signal from the receiving side. 3. The frequency of the called station signal is CED2100
If it is Hz, the protocol according to the normal T30 procedure is performed, and V
If 29 carrier frequency and V27 ter carrier frequency,
3. The facsimile apparatus according to claim 2, wherein the modem rate starts from 9600 bps and 4800 bps, respectively. 4. The protocol according to claim 1, wherein if there is an error in a protocol transmission procedure at a high speed modem speed, the modem speed is downshifted and the protocol is executed again. Facsimile machine.