JPH05122487A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To shorten a time required up to image transmission on a line with many noises in a device according to CCITT recommendation by informing the optimum transmission speed to a transmission terminal by judging by a reception terminal, and transmitting the image information from the transmission terminal at transmission speed designated by the reception terminal. CONSTITUTION:A means which judges the optimum transmission speed by counting the error bit of a training signal and informs a reception confirmation signal or a training failure signal to an opposite terminal by attaching an information field is provided at a reception side. Also, a means which transmits the image information at designated transmission speed found by analyzing the information field received from the opposite terminal is provided at a transmission side. When a terminal is operated as the transmission terminal, the image information read by a reading part 6 is encoded at an encoder/decoder part 5 by an encoding method designated by a control part 2. and it is sent out after being modulated at the modem of a line interface 1. When the terminal is operated as the reception terminal, the image information is decoded at the encoder/decoder part 5 by a decoding method in accordance with a designated code.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is used in a facsimile machine. In particular, the present invention relates to a facsimile apparatus that communicates with the G3 standard recommended by CCITT.

[0002]

2. Description of the Related Art In a conventional device, a training failure signal is returned when there is an error in the training signal, and the transmitter that receives the training failure signal retransmits the transmission station identification signal, non-standard setting command, and training signal again. It was transitioning. The transmission rate of the retransmitted training signal is notified by a non-standard setting command, and the same rate as the previous one or a transmission rate in one paragraph is designated.

[0003]

In such a conventional example device, when communicating with a device on a noisy line, the transmission station identification signal, the non-standard setting command, the training signal, and the training failure signal are transmitted. The transmission and reception are repeated until the transmission rate becomes optimum. For example, the optimum transmission rate is 2,400 bps, and the initial designation of the transmission rate is 9,60.
When the speed is 0 bps, even if the speed is set to one paragraph with one training failure signal, 7,200 bps, 4,
Training is repeated three times at 800 bps and 2,400 bps, and there is a drawback that the communication time until the transmission of image information becomes long.

The present invention eliminates such drawbacks, and an object of the present invention is to provide a facsimile apparatus equipped with means for reducing the time required for transmitting image information over a noisy line.

[0005]

The present invention has arrived at a facsimile apparatus provided with a reading means for reading image information and an interface means for sending out the image information read by the reading means at a set transmission speed. Counting means for counting all the error bits of all the bits of the training signal, registration means for registering the transmission rate and the allowable error bit number as a pair, the count result of the counting means and the allowable error bits of the registering means. Optimal transmission rate determining means for determining the transmission rate by comparing with the number, information adding means for giving information corresponding to this transmission rate to the information field added to the reception confirmation signal, and analyzing the information field of the incoming reception confirmation signal Analysis means and transmission rate setting means for setting the transmission rate based on the analysis result in the interface means Characterized by comprising a control unit including.

Here, the information giving means gives information corresponding to the transmission rate determined by the optimum transmission rate determining means to the information field added to the training failure signal, and the analyzing means gives information about the training failure signal. A configuration that analyzes the field may be used.

[0007]

The optimum bit rate is judged by counting the error bits of the training signal, and an information field is added to the reception confirmation signal or the training failure signal to notify the partner terminal. Further, the image information is transmitted at the designated transmission rate obtained by analyzing the information field of the reception confirmation signal or the training failure signal received from the partner terminal. As a result, it is possible to reduce the time required to transmit image information on a noisy line.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, the control procedure of this embodiment will be described. FIG. 2 is a control sequence diagram showing the operation of this embodiment. After the line is closed, the transmitting terminal and the receiving terminal mutually confirm that they are facsimile terminals by a predetermined phase A procedure, and shift to a phase B procedure. That is,
An initial identification signal consisting of a non-standard equipment signal indicating a non-standard capability unique to the user, a receiving station identification signal, and a digital identification signal characterizing the standard CCITT capability is sent from the receiving terminal to the transmitting terminal to convey its own capability. At this time, the non-standard equipment signal notifies the transmitting terminal that the receiving side has the ability to specify the transmission rate. The transmission terminal sends out a signal including a transmission signal identification signal, a non-standard setting command, and a training signal based on the analysis result of the content of the initial identification signal and the content specified by the operator. At this time, the receiving terminal is notified that it has the ability to transmit the image information at the transmission rate designated by the receiving side by the non-standard setting command. The receiving terminal shifts to the check operation of the training signal after analyzing the sending station identification signal and the non-standard setting command, counts the error bits, and after the reception of the training signal determines the transmission rate of the image information from the count value of the error bits. Then, the transmission rate is added as an information field to the reception confirmation signal or the training failure signal, and the transmission terminal is notified. The transmitting terminal analyzes the content of the information field of the reception confirmation signal or the training failure signal and transmits the image information at the designated transmission rate.

Next, the structure of this embodiment will be described. Figure 1
FIG. 3 is a block diagram showing the configuration of this embodiment. In this embodiment, a line interface 1, a control unit 2, a read-only memory (hereinafter, referred to as ROM) 3, an occasional write / read memory (hereinafter, referred to as RAM) 4, a code decoding unit 5, and a reading unit. 6 and a recording unit 7. Here, the control unit 2 is mainly composed of a microprocessor (hereinafter referred to as MPU), executes a program written in the ROM 3, transmits and receives a predetermined communication procedure, the line interface 1, the code decoding unit 5, Predetermined control for the reading unit 6 and the recording unit 7 is executed. That is, as shown in FIG. 1, this embodiment includes a reading unit 6 for reading image information and a line interface 1 for sending the image information read by the reading unit at a set transmission speed, and further, As a feature of the present invention, a RAM 4 that is a counting unit that counts error bits of all bits of an incoming training signal, and a ROM 3 that is a registration unit in which a transmission rate and an allowable error bit number are registered as a set. An optimum transmission rate determining means for determining the transmission rate by comparing the count result of the counting means with the allowable error bit number of the registration means, and information corresponding to this transmission rate is added to the reception confirmation signal or the training failure signal. Information giving means to the information field, the information field of the incoming acknowledgment signal or training failure signal And a control section 2 comprising analysis means and a transmission rate setting means for setting a transmission rate based on the analysis result to the line interface 1.

Next, the operation of this embodiment will be described with reference to FIG. When operating as a transmission terminal, the image information read by the reading unit 6 is encoded by the encoding / decoding unit 5 by the encoding method specified by the control unit 2, and is transmitted after being modulated by the modem of the line interface 1. When operating as a receiving terminal, the image information transmitted from the transmitting terminal is demodulated by the modem of the line interface 1 and decoded by the decoding method corresponding to the code specified by the code decoding unit 5. Is recorded and reproduced by the recording unit 7. A procedure signal such as the initial identification signal shown in FIG. 2 is generated by the control unit 2 and sent to the line via the line interface 1, and the received procedure signal is notified to the control unit 2 via the line interface 1 and analyzed. .. The training signal sent from the transmitting terminal is similarly notified to the control unit 2 via the line interface 1 of the receiving terminal, and the MPU in the control unit 2 determines whether or not there is an error. If there is an error, the counter prepared in the RAM 4 is counted up, and the next bit is checked. This operation is performed for all bits of the training signal, and after the check is completed, the counter of the RAM 4 is compared with the allowable error bit number of each transmission rate written in advance in the ROM 3 to determine the optimum transmission rate,
The transmission terminal is notified as an information field of a reception confirmation signal or a training failure signal. The transmission terminal is notified as an information field of the reception confirmation signal or the training failure signal notified to the control unit 2 of the transmission terminal. The information field of the reception confirmation signal or the training failure signal notified to the control unit 2 of the transmitting terminal is analyzed by the MPU,
The transmission speed of image information is set in the modem of the line interface 1, and the image information read by the reading unit 6 is sent to the receiving terminal at the optimum transmission speed.

That is, the definition of the training signal is C
Since it is a "0" continuous signal of 1.5 seconds ± 10% from CITT recommendation T20, the following number of bits is given at each transmission rate.

9,600 bits: 12,960 7,200 bits: 9,720 4,800 bits: 6,480 2,400 bits: 3,240 The allowable number of bits of error for this is 960.
Taking the 0-bit example, the setting is as follows. However,
Communication is not possible outside the range.

Communication is possible at 0 → 9,600 bps Communication is possible at 648 (5%) → 7,200 bps Communication is possible at 2,592 (20%) → 4,800 bps Communication is possible at 9,072 (70%) → 2,400 bps Yes This value is compared with the value of the error bit counter on the RAM to determine the transmission rate. For example, the number of error bits is 1
If it is 00, it is determined to be 7,200 bps, and if it is 5,000, it is determined to be 2,400 bps. However, specific values should be determined experimentally, and these values are reference values. Therefore, when the initial designation is 9,600 bps and the optimum transmission rate is 2,400 bps, it takes 6 steps (30 seconds) to send an image signal in the conventional example, but 1 step (5 seconds in this example. ) Is sufficient, and it can be expected to shorten by 25 seconds.

[0014]

As described above, according to the present invention, the receiving terminal determines the optimum transmission rate and notifies the transmitting terminal, and the transmitting terminal transmits the image information at the transmission rate designated by the receiving terminal. Even in the case of communication over a large number of lines, it is effective in shortening the communication time until the start of image information transmission.

[Brief description of drawings]

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

FIG. 2 is a sequence diagram showing control of the embodiment of the present invention.

[Explanation of symbols]

 1 line interface 2 control unit 3 ROM 4 RAM 5 code decoding unit 6 reading unit 7 recording unit

Claims (2)

[Claims] 1. A facsimile apparatus comprising a reading means for reading image information and an interface means for sending out the image information read by the reading means at a set transmission rate, for all bits of an incoming training signal. A counting means for counting error bits, a registration means in which a transmission speed and an allowable error bit number are registered as a pair, and a transmission speed by comparing the count result of the counting means with the allowable error bit number of this registration means. An optimum transmission rate determining means for determining, an information adding means for giving information corresponding to this transmission rate to an information field added to the reception confirmation signal,
A facsimile apparatus comprising: an analysis unit for analyzing an information field of an incoming reception confirmation signal; and a control unit including a transmission speed setting unit for setting a transmission speed based on the analysis result in the interface unit. 2. The information giving means gives information corresponding to the transmission rate determined by the optimum transmission rate determining means to an information field added to the training failure signal, and the analyzing means gives the information field of the training failure signal. The facsimile apparatus according to claim 1, wherein the facsimile device is analyzed.