JPH07123233A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To reduce the extension of a communication time caused by erroneous reception by setting a data signal speed of a sender side facsimile equipment to be a proper quick speed based on the CCITT recommendations T.30 with respect to the facsimile equipment. CONSTITUTION:When picture information is completely received by a communication control section 13, an MCF signal is sent and when not completely received, an RTN signal is sent. An error number count section of a training discrimination section 16 counts number of error data of TCF signals received by a MODEM section 14. Then a training discrimination section 16 discriminates the propriety of training for an error data number based on a 1st error discrimination condition among n-sets of error discrimination conditions. When discriminated to be small, the communication control section 13 sends a CFR signal and when discriminated to be large, a 2nd error discrimination condition is set to the training discrimination section 16 and an FTT signal is sent.

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 for promptly determining the data signal rate of a modem.

[0002]

2. Description of the Related Art In facsimile communication, a data signal rate of a modem is determined prior to communication of image data after a call is set up and a predetermined control procedure is completed based on the G3 facsimile protocol. Conventionally, the data signal rate of the modem is determined by a training check signal T from a facsimile machine on the transmission side at a predetermined data signal rate.
The CF normally sends a serial signal of "0", the receiving side detects the number of error bits of this TCF signal, judges whether the number of error bits is less than a predetermined reference value, and a reception preparation confirmation signal. This is done by transmitting a CFR or training failure signal FTT. That is, the facsimile machine on the transmitting side usually first transmits the TCF signal at the highest data signal rate (for example, 9600 bps), and the facsimile machine on the receiving side detects the number of error bits of the TCF signal. If the number of error bits is less than a predetermined reference value, C
When the FR signal is transmitted, the data signal speed at that time is adopted, and the number of error bits is equal to or more than a predetermined reference value, FT
Transmit T signal. When the transmitter receives the FTT signal,
The data signal rate is reduced by one step, the TCF signal is transmitted again, and this processing is repeated until the CFR signal is transmitted from the receiving side. When the number of error bits falls below the standard value,
The receiver sends a CFR signal to determine the data signal rate.

Conventionally, as a facsimile apparatus, a "facsimile communication system and a facsimile apparatus" described in Japanese Patent Application Laid-Open No. 2-146848 has been proposed. This one selects the data signal rate according to the number of error bits of the TCF signal on the receiving side, and the bit information for the rate is FT.
By adding the T signal and transmitting it, the data signal speed suitable for the line state can be changed and the communication time can be shortened. Specifically, the TCF signal transmitted from the transmission side facsimile apparatus is received, and the reception side facsimile apparatus transmits the CFR signal or the FTT signal according to the reception result to determine the data signal rate of the modem. In this case, the system control unit of the receiving side device detects the number of bit errors of the TCF signal, sets the data signal speed of the modem based on the number of bit errors, and sets the facsimile information bit indicating this speed to the FTT signal. Add and send. The device receiving this is configured to transmit a TCF signal at the data signal rate indicated in the FTT signal.

[0004]

In the conventional "facsimile apparatus", CCITT Recommendation T.27. Based on 30, the training check is performed before the transmission of the image information, and when it is determined that the received image is defective, a negative response such as the RTN signal and the PIN signal is returned from the facsimile machine on the receiving side.

However, if the CFR signal is returned from the receiving facsimile machine and the training check is successful, the next image information is transmitted. Here, if the result of the training check is a little uncertain, there is a problem that all the image information is ended in an error over a plurality of pages in the process of receiving the image information. Therefore, in the conventional "facsimile apparatus", the receiving side facsimile apparatus selects the data signal rate based on the number of error bits of the TCF signal, and adds bit information indicating the data signal rate to the FTT signal. By transmitting to the facsimile machine on the transmission side, and the facsimile machine on the transmission side transmits the TCF signal at the data signal speed, the data signal speed suitable for the line state is promptly transferred to perform the modem training. This has the advantage of reducing communication time and communication costs.

As described above, many conventional "facsimile machines" or the like add error information to the FTT signal. Therefore, the present invention is based on CCITT Recommendation T.264. Thirty
Based on the above, the data signal speed of the sending side facsimile machine can be quickly set to an accurate speed, the number of error pages generated due to error reception is reduced, and wasteful consumption of paper resources is reduced. Aims to provide a facsimile machine capable of shortening communication time.

[0007]

The invention according to claim 1 is
In order to solve the above-mentioned problems, the facsimile machine of the other party and CCITT recommendation T.264 via a communication line. In a facsimile apparatus that communicates image information based on 30, the first communication control unit that receives the image information transmitted from the transmission side facsimile apparatus and the image information received by the first communication control unit are completely When the image information received by the first communication control unit is not completely received, the message confirmation signal MCF is transmitted when it is received, and the retraining negative signal RTN is transmitted when the image information is not completely received. A communication control unit,
A modem unit for receiving the training check signal TCF transmitted from the transmitting side facsimile apparatus, an error number counting unit for counting the first error data number of the TCF signal received by the modem unit, and the error data number in advance. A training determination unit that determines whether or not training is possible based on the first error determination condition among the set n error determination conditions, and the training determination unit determines that the first error data number is greater than the first error determination condition. If it is determined that it is smaller, a reception preparation confirmation signal CFR is transmitted, and if it is determined that the first error data number is larger than the first error determination condition by the training determination unit, the training determination unit And a third communication control unit for transmitting the training failure signal FTT to the second error determination condition. Wherein the sequentially performed training check on the basis of the TCF signal transmitted from the facsimile apparatus.

[0008]

According to the first aspect of the invention, the facsimile machine of the other party and CCITT recommendation T.264 are provided via the communication line. In a facsimile device that communicates image information based on 30, when the communication control unit receives the image information transmitted from the transmitting facsimile device, a message confirmation signal MCF is transmitted when the image information is completely received. If the image information is not completely received, the retraining negative signal RTN is transmitted. The modem section receives the training check signal TCF transmitted from the transmitting side facsimile machine, and the error number counting section counts the error data number of the TCF signal. Next, the training determination unit determines whether or not the training is possible based on the first error determination condition of the n error determination conditions in which the number of error data is preset. When the training determination unit determines that the first error data number is smaller than the first error determination condition, the communication control unit transmits the reception preparation confirmation signal CFR, and the training determination unit determines the first error data. When it is determined that the number is larger than the first error determination condition, the training determination unit sets the second error determination condition, and the communication control unit transmits the training failure signal FTT. In this way, since the training check is sequentially performed based on the TCF signal transmitted from the transmitting side facsimile apparatus, when performing multi-page reception, the data signal rate of the transmitting side facsimile apparatus can be quickly set to an accurate rate. , Reduce the number of error pages caused by error reception and reduce waste of paper resources,
By force, communication time can be shortened.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. First, the system configuration of the facsimile will be described. FIG. 1 is a system configuration diagram of a facsimile apparatus according to an embodiment of the present invention. As shown in FIG. 1, the facsimile apparatus 1 includes a system control unit 11, a system memory 12, a communication control unit 13, a modem 14, a network control unit 15,
Training determination unit 16, image memory 17, encoding / decoding unit 18, plotter 19, scanner 20, and operation unit 4
Is equipped with.

The system control section 11 is provided with a ROM for storing a control program for the entire facsimile apparatus and a data signal speed setting processing program of the present invention, and controls each section of the facsimile apparatus 1 according to the programs in the ROM to control the facsimile apparatus 1 And the data signal speed setting process of the present invention is executed. A work area is formed in the system memory 12, and various control parameters are stored therein. In particular, parameters used in the data signal speed setting process of the present invention are stored therein. The parameters used in the data signal speed setting process include the number of error bits of the TCF signal and the CFR signal set corresponding to the number of error bits,
The data signal speed and the like to be included in the FTT signal.

The image memory 17 stores the image information coded by the encoding / decoding unit 18 (for example, coded by the MH system), and the image information stored in the image memory 16 is stored in the file management table of the system memory 12. Are managed by the system controller 11. The encoding / decoding unit 18 is intended to reduce the transmission time of image information and improve efficiency, and compresses (encodes) image information at the time of transmission,
Further, upon reception, the encoded image information is reproduced as original data.

As the plotter 19, for example, a thermal recording device equipped with a thermal element is used, and the plotter 18 records directly on the heat-sensitive recording paper or indirectly on the ordinary recording paper via an ink ribbon. The scanner 20 may be, for example, a CCD (Charge Coupie).
A line image sensor using dDevice) is used, and image information of a document is read line by line and output as image information.

Further, the communication control unit 13 exchanges a facsimile control signal with the partner facsimile machine and executes a control procedure. The modem unit 14 modulates image information into a form suitable for transmission through an external line at the time of transmission, demodulates a modulated signal sent from the external line at the time of reception, and
The training check signal TCF transmitted from the transmitting facsimile machine is received.

The network control unit 15 is generally called AA-NCU, and the network control unit 15 is connected to an external line and the handset 5. The network control unit 15 automatically calls the destination and automatically receives the call from the external line. The training determination unit 16 includes an error number counting unit that counts the error data number of the TCF signal received by the modem unit 14, and all "0" data is transmitted from the transmitting side facsimile apparatus (TX) for 1.5 seconds. Then, the receiving side facsimile apparatus 1 (RX) counts the number of garbled data "1" due to an error and determines whether or not there is an error based on the error determination condition.

Next, the basic operation of the facsimile apparatus shown in FIG. 1 will be described. In the facsimile device 1, at the time of transmission or storage, the scanner 20 scans a document from the first page to read image information, sends the image information to the encoding / decoding unit 18, and the encoding / decoding unit 18 encodes the image information. The coded image information is stored in the image memory 17 in the storage mode and then transmitted at a predetermined time. In the immediate mode, the coded image information is sent to the modem 14 via the communication control unit 13 and modulated, and then the network control unit. Sent to the line via 15.

On the other hand, the facsimile machine 1 receives
The image information (modulated signal) input from the line is transferred to the modem 14
Are demodulated by and are stored in the image memory 17. Image memory 17
The image information stored in (1) is read out immediately or at a predetermined time, is decoded (decoded) by the encoding / decoding unit 18, and is then sent to the plotter 19. Plotter 1
The image information sent to 9 is recorded on the recording paper by the plotter 19.

The facsimile apparatus 1 needs to determine the data signal rate during such transmission and reception. The data signal speed setting process will be described below based on the protocol shown in FIG. Now, the sending side facsimile machine (TX) and the receiving side facsimile machine (RX)
For both, the facsimile machine 1 shown in FIG. 1 is used.

In FIG. 2, the sending side facsimile machine 1
When a call is made from (TX), the receiving side facsimile device 1
(RX) transmits a called terminal identification signal CED, a non-standard function identification signal NSF signal, and a digital identification signal DIS signal. A non-standard function is indicated in this NSF signal, and the function is a normal CCI as shown in FIG. 3a.
TT (International Telegraph and Telephone Advisory Committee) Recommendation T.T. 30 in the training failure signal FTT, as shown in FIG.
This indicates whether or not the FTT signal added with the IF bit (facsimile information field) can be used.

As shown in FIG. 2, when all "0" data is transmitted from the transmitting facsimile machine (TX) for 1.5 seconds, the training judging section 16 of the receiving facsimile machine 1 (RX) outputs an error. Data "1" which is garbled by
Is counted to determine whether or not there is an error. At this time, for example, if the number of garbled data "1" exceeds the predetermined value "N", it is determined as an error and the training failure signal FTT is transmitted to the transmitting side facsimile apparatus (TX).

FIG. 4 shows the protocol when a positive response is returned. As shown in FIG. 4, when the sending facsimile machine (TX) finishes sending the image information, next,
Transmit multi-page signal MPS and return to phase C,
The receiving facsimile machine (RX) sends a message confirmation signal MCF. Since the image information is normally received by the receiving facsimile machine (RX) by the MCF signal,
The sending facsimile machine (TX) sends the image information of the next page.

FIG. 5 shows a protocol when a negative response is returned. As shown in FIG. 5, when the transmitting facsimile machine (TX) finishes transmitting the image information, next,
Transmit multi-page signal MPS and return to phase C,
The receiving facsimile machine (RX) sends a retraining negative signal RTN. Since the image information is not normally received by the receiving facsimile machine (RX) due to the RTN signal, the transmitting facsimile machine (TX) is set to the DCS.
Signal, then training check signal TCF
To send. The reception side facsimile device (RX) transmits the reception preparation confirmation signal CFR, and thereby the transmission side facsimile device (TX) transmits the image information of the next page.

Next, the operation according to the present invention will be described. A plurality of types of error determination conditions'N 'are prepared in the training determination unit 16. As shown in FIG. 2, when all “0” data is transmitted from the transmitting facsimile machine (TX) for 1.5 seconds, the receiving facsimile machine 1 (RX) detects the number of garbled data “1” due to an error. Count and determine whether or not there is an error. At this time, for example, if the number of garbled data "1" exceeds the predetermined value "N", it is determined as an error and the training failure signal FTT is transmitted to the transmitting side facsimile apparatus (TX).

Here, the error judgment condition'N 'is, for example, N1 to N4, N1: 20 bit N2: 15 bit N3: 10 bit N4: 5 bit.

When an error is determined based on the error determination condition N1, even if the training check signal TCF has an error bit number of 18 bits, the relationship of N1> 18 bit is established, so that the receiving side facsimile apparatus 1
(RX) returns the reception preparation confirmation signal CFR.

When an error is determined on the basis of the error determination condition N2, if the training check signal TCF has an error bit number of 18 bits, the relationship of N2 <18 bit is established.
(RX) returns the training failure signal FTT.
Therefore, the smaller the value of the error judgment condition'N ', the more severe the judgment becomes. As a result, the received image is more likely to be good.

Therefore, when a negative response is transmitted, the value of the error judgment condition'N 'is set small. FIG. 6 shows a protocol for the operation of decreasing the'N 'value when a negative response is returned. Figure 6
As shown in, the sending facsimile machine 1 (TX) makes a call, and after the necessary procedure, the training check signal T
Send CF. Receiving side facsimile machine 1 (RX)
First sets the initial value of the error determination condition to N1 = 20. The number of garbled data "1" due to an error in the TCF signal is determined based on this error determination condition. Here, since the relationship of N1> 18 bit is established, the receiving side facsimile device 1
(RX) returns the reception preparation confirmation signal CFR.

Next, the sending side facsimile apparatus 1 (TX)
Is V. Based on 29, image information is transmitted at a data signal rate of 9600 bps. Next, the multi-page signal MPS is transmitted, the process returns to phase C, and the receiving side facsimile device (RX) transmits the retraining negative signal RTN. When a negative response is transmitted, the training determination unit 16 lowers and sets the set value of the error determination condition to N2 = 15.

Next, the transmitting side facsimile apparatus 1 (TX)
Has received the RTN signal, it transmits the training check signal TCF. Receiving side facsimile machine 1 (R
X) determines the number of garbled data "1" due to an error in the TCF signal based on this error determination condition. Here, since the relationship of N2 <18 bit is established, it is judged as an error, and the training failure signal FTT is transmitted to the transmitting side facsimile machine (T
X).

Next, the sending side facsimile machine (TX)
Start retraining. The receiving side facsimile apparatus 1 (RX) judges the number of garbled data "1" due to an error in the TCF signal based on this error judgment condition N2. Since the relationship of N2> 13 bit is established, the receiving side facsimile device 1
(RX) returns the reception preparation confirmation signal CFR.

Next, the sending side facsimile apparatus 1 (TX)
Is V. Based on 29, the image information is transmitted at a data signal rate of 7200 bps. FIG. 7 shows a protocol of operation when a positive response is returned. As shown in FIG. 7, the sending facsimile machine 1 (TX) makes a call, and after the necessary procedure, the training check signal TC
Send F. The receiving side facsimile machine 1 (RX)
First, set the initial value of the error judgment condition to N1 = 20. The number of garbled data "1" due to an error in the TCF signal is determined based on this error determination condition.

Since the relationship of N1> 18 bit is established, the receiving side facsimile apparatus 1
(RX) returns the reception preparation confirmation signal CFR. Next, the transmission side facsimile apparatus 1 (TX) receives the V. Based on 29, image information is transmitted at a data signal rate of 9600 bps. Next, the sending facsimile machine 1 (T
X) sends a message end signal EOM and returns to phase B, and the receiving facsimile machine (RX) sends a message confirmation signal MCF in response to the EOM signal.

Next, the receiving side facsimile machine (RX)
Returns to phase B and transmits the digital identification signal DIS. The transmission side facsimile apparatus 1 (TX) transmits the training command signal TCF after transmitting the digital command signal DCS. Receiving side facsimile machine 1 (R
For X), the value of the error determination condition is kept at the initial value and N1 = 20 is set.

When the sending side facsimile apparatus 1 (TX) sends the message end signal EOM and returns to the phase B, there are N = 20. Next, FIG. 8 is a flowchart showing the operation content of the training determination unit. The training determination unit 16 determines whether the request is an initialization request (process S1). In the case of the initialization request, the error determination condition is set to N = 20, and the process ends (process S2).

If it is not the initialization request, it is determined whether or not the error determination condition is set low (step S3). When the error determination condition is set low, it is first determined whether or not the error determination condition can be set low (process S).
4). If the error determination condition can be set low, the error determination condition is set to N = N-5, and a value obtained by subtracting "5" from the error determination condition set in the training determination unit 16 is newly set as the error determination condition. (Processing S5). If the error determination condition cannot be set low, the process ends.

If the error determination condition is not set lower than that in step S3, it is determined whether the training check TCF is requested (step S6). If the training check TCF is requested, the TCF signal is sent. Is received, and the number of garbled data "1" due to an error in the TCF signal at that time is counted (process S7). It is determined whether the number of received error bits is larger than the error determination condition N (step S8).

When the number of error bits received is larger than the error judgment condition N, the receiving side facsimile machine (R
X) transmits the retraining negative signal RTN and returns a negative response (process S9). When the number of received error bits is not larger than the error determination condition N, the receiving side facsimile device (RX) transmits a message confirmation signal MCF and returns a positive response (step S10).

The effects of the present invention will be described below. CCITT Recommendation T.38 and the other facsimile machine via the communication line. In a facsimile device that communicates image information based on 30, when the communication control unit receives the image information transmitted from the transmitting facsimile device, a message confirmation signal MCF is transmitted when the image information is completely received. If the image information is not completely received, the retraining negative signal RTN is transmitted. The modem section receives the training check signal TCF transmitted from the transmitting side facsimile machine, and the error number counting section counts the error data number of the TCF signal. Next, the training determination unit determines whether or not the training is possible based on the first error determination condition of the n error determination conditions in which the number of error data is preset. When the training determination unit determines that the first error data number is smaller than the first error determination condition, the communication control unit transmits the reception preparation confirmation signal CFR, and the training determination unit determines the first error data. When it is determined that the number is larger than the first error determination condition, the training determination unit sets the second error determination condition, and the communication control unit transmits the training failure signal FTT. In this way, since the training check is sequentially performed based on the TCF signal transmitted from the transmitting side facsimile apparatus, when performing multi-page reception, the data signal rate of the transmitting side facsimile apparatus can be quickly set to an accurate rate. The number of error pages generated due to error reception can be reduced, wasteful consumption of paper resources can be reduced, and communication time can be shortened.

[0038]

If the number of error data is larger than the preset error determination condition, the training failure signal FTT is transmitted from the communication control unit, so that the data signal speed of the transmitting side facsimile apparatus can be promptly set to an appropriate speed. The number of error pages that can be set can be reduced, the number of error pages generated can be reduced, wasteful consumption of paper resources can be reduced, and communication time can be shortened.

[Brief description of drawings]

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

FIG. 2 CCITT Recommendation T. 30 is a diagram showing a protocol of a facsimile device based on 30. FIG.

FIG. 3 CCITT Recommendation T. It is a figure which shows the training failure signal FTT based on 30.

FIG. 4 is a diagram showing a protocol when a facsimile device according to an embodiment of the present invention returns a positive response.

FIG. 5 is a diagram showing a protocol when a facsimile device according to an embodiment of the present invention returns a negative response.

FIG. 6 is a diagram showing a protocol of an operation of decreasing the'N 'value when the facsimile device according to the embodiment of the present invention returns a negative response.

FIG. 7 is a diagram showing a protocol of an operation when a facsimile device according to an embodiment of the present invention returns a positive response.

FIG. 8 is a diagram showing a flowchart of the operation content of the training determination unit according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Facsimile apparatus 4 Operation part 11 System control part 12 System memory 13 Communication control part 14 Modem part 15 Network control part 16 Training determination part 17 Image memory 18 Encoding / decoding part 19 Plotter 20 Scanner

Claims (1)

[Claims] 1. A facsimile apparatus of a counterpart and CCITT recommendation T.264 via a communication line. A facsimile device that communicates image information based on 30, and a first communication control unit that receives the image information transmitted from the transmitting facsimile device;
When the image information received by the first communication control unit is completely received, the message confirmation signal MCF is transmitted, and the image information received by the first communication control unit is not completely received. In the case where the training check signal T is transmitted, the second communication control unit for transmitting the retraining negative signal RTN and the training check signal T transmitted from the transmitting side facsimile apparatus.
The modem unit for receiving the CF, the error number counting unit for counting the first error data number of the TCF signal received by the modem unit, and the error data number out of n preset error judgment conditions A training determination unit that determines whether training is possible based on the first error determination condition;
When the training determination unit determines that the first error data number is smaller than the first error determination condition,
When the training determination unit determines that the first error data number is larger than the first error determination condition by transmitting the reception preparation confirmation signal CFR, the training determination unit sets the second error determination condition. And a third communication control unit that transmits a training failure signal FTT, and sequentially performs a training check based on the TCF signal transmitted from the transmission side facsimile device.