JPH0795341A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To attain proper error discrimination processing for a reception signal by adding number of error lines equivalent to an hit accumulation time so as to execute error discrimination of the reception signal. CONSTITUTION:A coding/decoding section 8 is set to a decoding mode to set a detection signal of a carrier detector 12 and to start carrier monitor processing for detection of a hit. The processing is awaited till a line end signal arranged to a head of received picture information is detected, the first line end signal is detected and reception data are transferred to the coding decoding section 8 till occurrence of hit is informed from a carrier monitor. Then the hit time of the reception signal is measured and number of errors equivalent to the measured hit time is added to number of errors included in the received picture information at that time and when the result of sum exceeds a predetermined value, a negative acknowledge is sent as an acknowledge signal after the message.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention detects an error line included in received image information and, when the number of detected error lines exceeds a predetermined value, sends a negative response as a response signal after a message. The present invention relates to a facsimile machine.

[0002]

2. Description of the Related Art In a public telephone line network used as a transmission line in a group 3 facsimile machine or the like, transmission quality is deteriorated due to various causes, and one of the causes of the deterioration is interruption.

This instantaneous interruption is a phenomenon in which a signal is not detected on the line for a (relatively) short time. In the case of a momentary interruption, if it is a telephone call, a continuous sound is heard as if it were momentarily interrupted, and it does not affect the call itself so much.

However, if a momentary interruption occurs during the data transmission of the group 3 facsimile apparatus, a receiving signal cannot be obtained at the receiving side during that period, so that the receiving side cannot record and output a normal image.

Conventionally, a mechanism for detecting this instantaneous interruption is provided, and when the instantaneous interruption time exceeds a predetermined value (for example, about 200 milliseconds), it is determined that a reception error has occurred,
After the message, a negative response signal is sent as a signal to respond to the transmitting side.

[0006]

However, such a conventional method has the following disadvantages.

That is, as shown in FIGS. 8 (a) to 8 (c), a line end signal EOL indicating a line break of image information due to a very short instantaneous interruption of a signal appearing on a line.
However, if the receiving side cannot obtain the information, the receiving side recognizes the image information for two lines as the image information for one line.

In this case, when the image information is decoded on the receiving side, an error for one line is detected because the number of bits of the obtained image signal is different from a predetermined value, but in reality,
The number of error lines should be determined to be 2, so
This causes a situation in which the determination result of the reception error becomes inaccurate.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a facsimile apparatus capable of appropriately determining a reception error caused by a momentary interruption of a signal generated in a line.

[0010]

The present invention detects an error contained in received image information and, when the number of detected errors exceeds a predetermined value, sends a negative response as a response signal after a message. In a facsimile machine,
The instantaneous interruption time measuring means for measuring the instantaneous interruption time of the received signal and the number of errors corresponding to the instantaneous interruption time measured by this instantaneous interruption time measuring means are set to the number of errors included in the received image information received at that time. When the addition is performed and the addition result exceeds a predetermined value, a control means for sending a negative response as a response signal after the message is provided.

In addition, when an error line included in the received image information is detected and the number of detected error lines exceeds a predetermined value, a reception signal is sent in a facsimile device which sends a negative response as a response signal after the message. The momentary interruption time measuring means for measuring the momentary interruption time and the number of error lines corresponding to the momentary interruption time measured by the momentary interruption time measuring means are calculated, and the calculated error line number is received at that time. If it is added to the number of error lines included in the received image information and the addition result exceeds a predetermined value,
As a response signal after the message, a control means for sending a negative response is provided.

Further, when an error line included in the received image information is detected, and the number of the detected error line exceeds a predetermined value, a reception signal is sent by a facsimile apparatus which sends a negative response as a response signal after the message. The momentary interruption time measuring means for measuring the momentary interruption time and the momentary interruption time measured by the momentary interruption time measuring means are divided by the minimum compensation time per line set at that time, which is equivalent to the quotient of the division. The number of error lines to be added is added to the number of error lines included in the received image information received at that time, and when the addition result exceeds a predetermined value, a control means for sending a negative response as a response signal after the message is provided. Be prepared.

Further, when an error line included in the received image information is detected and the number of detected error lines exceeds a predetermined value, the facsimile machine which sends a negative response as a response signal after the message ends the line. The instantaneous interruption time cumulative measuring means for accumulatively measuring the instantaneous interruption time of the received signal between the signals, and the instantaneous interruption interruption time measured by the instantaneous interruption time cumulative measuring means are the minimum compensation per line set at that time. When it is smaller than the time, 1 is added to the number of error lines included in the received image information received at that time, and when the addition result exceeds a predetermined value, a negative response is sent as a response signal after the message. , When the instantaneous interruption cumulative time is greater than the minimum compensation time,
The momentary interruption cumulative time is divided by the minimum compensation time, and the number of error lines corresponding to the quotient of the division is added to the number of error lines included in the received image information received at that time,
When the addition result exceeds a predetermined value, a control means for sending a negative response as a response signal after the message is provided.

Further, when an error line included in the received image information is detected and the number of the detected error line exceeds a predetermined value, a reception signal is sent in a facsimile device which sends a negative response as a response signal after the message. The instantaneous interruption measurement means for measuring the instantaneous interruption time of the, and the instantaneous interruption measurement means for accumulating the instantaneous interruption time measured by the instantaneous interruption measuring means between the line end signal and the instantaneous interruption measured by the instantaneous interruption measuring means. When the time exceeds the predetermined value, a negative response is sent as a response signal after the message, while the instantaneous interruption time accumulated by the instantaneous interruption time accumulation measuring means is less than the minimum compensation time per line set at that time. Is smaller than 1, then 1 is added to the number of error lines included in the received image information received at that time, and if the addition result exceeds a predetermined value, the response message after the message is sent. As a negative response, when the momentary interruption cumulative time is greater than the minimum compensation time, the momentary interruption cumulative time is divided by the minimum compensation time, and the number of error lines corresponding to the quotient of the division, The control means is added to the number of error lines included in the received image information received at that time, and when the addition result exceeds a predetermined value, a negative response is sent as a response signal after the message.

[0015]

Therefore, since the error judgment of the received signal is executed by adding the number of errors corresponding to the instantaneous interruption time or the number of error lines corresponding to the accumulated interruption time, even if the interruption occurs. Appropriate received signal error determination processing can be performed.

[0016]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 shows a group 3 facsimile apparatus according to an embodiment of the present invention.

In FIG. 1, the control unit 1 performs control processing of each unit of the facsimile apparatus and facsimile transmission control procedure processing, and the system memory 2 is
The control unit 1 stores a control processing program executed by the control unit 1 and various data necessary for executing the processing program, and constitutes a work area of the control unit 1. The parameter memory 3 is a group memory. The timer circuit 4 is for storing various kinds of information unique to the facsimile apparatus, and for generating various timer signals such as a timer signal for activating a process (described later) for carrier monitoring. belongs to.

The scanner 5 is for reading an original image at a predetermined resolution, the plotter 6 is for recording and outputting an image at a predetermined resolution, and the operation display unit 7 is a facsimile device. For operation,
It consists of various operation keys and various indicators.

The encoding / decoding unit 8 is for encoding and compressing the image signal and for decoding the encoded and compressed image information into the original image signal.
It is for storing image information in a coded and compressed state, a raw image signal, and the like.

The group 3 facsimile modem 10 is for realizing the modem function of the group 3 facsimile, and is a low speed modem function (V.21 modem) for exchanging transmission procedure signals and mainly exchanging image information. High-speed modem function (V.33 modem,
V. 29 modem, V.29. 27ter modem etc.).

The network control device 11 is used to connect the facsimile device to a public telephone line network and has an automatic call originating / receiving function. Further, the carrier detector 12 is
The carrier of the received signal on the line is detected.

These control unit 1, system memory 2,
The parameter memory 3, timer circuit 4, scanner 5, plotter 6, operation display unit 7, encoding / decoding unit 8, image storage device 9, group 3 facsimile modem 10, and network control device 11 are connected to the system bus 12. Has been done,
Data is exchanged between these elements mainly via the system bus 12.

Data is exchanged directly between the network controller 11 and the group 3 facsimile modem 10. Further, the detection signal CD output by the carrier detector 12 at the time of carrier detection is output to the control unit 1 via the system bus 12.

FIGS. 2A and 2B show an example of processing executed by the group 3 facsimile apparatus when an incoming call is detected.

First, when an incoming call is detected (process 101), an incoming call is answered (process 102), the called station identification signal CED for indicating that the own terminal is a voice-received terminal, and the non-standard of the own terminal. A non-standard function identification signal NSF for notifying the communication function and a digital identification signal DIS for notifying the standard communication function of the own terminal are sequentially transmitted (process 103), and a command signal from the calling terminal is sent. Receive (Process 10)
4).

Then, the transmission function corresponding to the command signal from the calling terminal is set in the own terminal (process 105), and a predetermined modem training procedure is executed at the modem speed designated at that time (process 106).

In this way, when the preparation for transmitting the image information is completed, the one-page receiving process (process 107) for receiving the image information for one page and the image of the image information received at that time are processed. A one-page recording process for recording and outputting from the plotter 6 is executed (process 108), and a post-message signal following one page of image information is processed (process 10).
9).

At this time, in the one-page receiving process, it is checked whether or not the image information for one page is normally received (decision 110), and when the result of the judgment 110 is YES. A message confirmation signal MCF indicating that one page of image information has been properly received is sent to the partner terminal (process 111), and the result of judgment 110 is N.
When it becomes O, a retrain negative signal RTN indicating that one page of image information has been error-received is sent to the partner terminal (process 112).

Then, it is checked whether the post-message signal received at that time is the procedure end signal EOP (decision 113), and when the result of the decision 113 is NO,
In order to receive the image information of the next page, the process 107 is performed.

When the result of the judgment 113 is YES, the disconnection command signal DCN is received from the partner terminal (process 114), the line is restored (process 115), and the series of image information receiving operation is ended.

FIGS. 3 and 4 show an example of the one-page receiving process.

First, the encoding / decoding unit 8 is set to the decoding mode (process 201), and the carrier monitoring process (described later) for detecting the detection signal CD of the carrier detector 12 to detect an instantaneous interruption is started. (Process 202).

Then, the process waits until the line end signal EOL arranged at the beginning of the received image information is detected (decision 20).
(NO loop 3), when the first line end signal EOL is detected and the result of the determination 203 is YES, the received data is received until the line end signal EOL is detected or the carrier monitoring process notifies the occurrence of an instantaneous interruption. Is transferred to the encoding / decoding unit 8 (processing 204, processing loop of determinations 205 and 206).

Here, when the occurrence of the instantaneous interruption is notified from the carrier monitoring process and the result of the determination 206 is YES, the decoding process of the encoding / decoding unit 8 is ended (process 20).
7) and notifies the upper processing of the reception error (processing 20).
8) The process ends in error.

When the line end signal EOL is detected and the result of the judgment 205 is YES, it is checked whether or not the control return signal RTC in which the six line end signals EOL are arranged is detected (decision 209). When the result of the determination 209 is YES, it means that the image information for one page has been normally received, and the upper processing is notified that the reception of the image information for one page has been normally completed (process 21).
0), the process is terminated. Note that the determination 209 can be used as the determination condition that the two line end signals EOL are continuously detected.

When the result of the determination 209 is NO, it means that the image information for one line has been received.
At this time, the encoding / decoding unit 8 that has decoded the image information for one line checks whether or not an error line is detected (decision 211). This error line can be detected, for example, by determining whether or not the image signal obtained by decoding has a predetermined number of bits.

When the result of judgment 211 is NO,
The image signal for one line obtained at that time is transferred to the plotter 6 (process 212), and the image recording for that one line is performed. When the result of the determination 211 is YES, the value of the error line counter EL for counting the number of error lines is incremented by 1 (process 213).

When the processing 212 and the processing 213 are completed, the instantaneous interruption time value notified from the carrier monitoring processing is input and substituted into the variable TC (processing 214), and the 1 line minimum compensation time TL set at that time is set. The value of the variable TC is divided by the value, and the value of the quotient obtained by the division is substituted into the variable TE (process 215). Here, INT (x) is an operator for extracting the integer part of the variable x.

Next, the value of the variable TE is added to the value of the error line counter EL, and the value of the error line counter EL is corrected by the number of error lines corresponding to the instantaneous interruption time that has occurred at that time (process 216). Then, it is checked whether or not the corrected value of the error line counter EL is equal to or larger than a predetermined number EE (decision 217).

If the result of judgment 217 is YES, it means that a large error has occurred in the image information received at that time, and therefore the processing shifts to step 208, the reception error is notified to the upper processing, and this processing is executed. To finish.

When the result of the judgment 217 is NO, the process 20 is executed to process the image information of the next line.
Go to 4.

FIG. 5 shows an example of the carrier monitoring process. When this carrier monitoring process is activated,
It is repeatedly executed at intervals of a predetermined time TS (for example, 5 milliseconds).

First, at that time, it is checked whether or not the detection signal CD output from the carrier detector 12 is in the carrier detection state (decision 301), and if the result of the decision 301 is YES, it is first started. Or the momentary interruption of the signal has occurred and the momentary interruption has ended, the variable TB representing the momentary interruption time has a predetermined time value (for example, 200 milliseconds) for determining the momentary interruption. ) Is set to a value obtained by subtracting the value of the variable TA from the set constant KA (process 302) and the one-page reception process is notified that the instantaneous interruption time has been calculated (process 303). The value of the variable TB is set as the instantaneous interruption time value to be passed to the one-page receiving process (process 304).

Then, the value of the variable TA is initialized to the value of the constant KA, and the value of the variable TB is initialized to 0 (process 305).

Further, a signal interruption occurs, and the detection signal C
Judgment is made when D is in the carrier non-detection state.
When the result of 1 is NO, the value of the time TS is subtracted from the value of the variable TA (process 306).

Then, it is checked whether or not the value of the variable TA is 0 or less (decision 307). If the result of determination 307 is NO, it means that the instantaneous interruption time has not reached the specified value, so this processing ends. Also, judgment 307
If the result is YES, it means that the instantaneous interruption time has exceeded the specified value, so the occurrence of an instantaneous interruption is notified to the one-page receiving process (process 308) and this process is terminated.

Therefore, when the state where the carrier is not detected occurs due to the instantaneous interruption of the received signal, the value of the variable TA becomes the initial value constant KA at a predetermined time TS interval during the duration of the instantaneous interruption. From the corresponding time, the time decreases by a predetermined time TS unit.

Then, when the value of the variable TA becomes 0, that is, when the instantaneous interruption continues for a predetermined time or longer, the occurrence of the instantaneous interruption is notified to the upper one-page receiving process. In this case, the one-page receiving process notifies the upper process of the reception error.

When the instantaneous interruption does not exceed the predetermined time, the instantaneous one-page receiving process is notified of the instantaneous interruption time value indicating the duration of the instantaneous interruption. In this case, the one-page receiving process calculates a correction value for the number of error lines corresponding to the notified instantaneous interruption time value, and adds this correction value to the number of error lines detected by the encoding / decoding unit 8 at that time. After the addition, the page received at that time is determined as an error based on the number of error lines after the addition.

In this way, in the present embodiment, when a momentary interruption occurs, the error judgment of the received image information is executed by taking into consideration the number of error lines corresponding to the momentary interruption occurring at that time. It is possible to realize accurate image information error determination.

The instantaneous interruption time is set to 1 at that time.
It is divided by the line minimum compensation time, and the quotient of the division is used as a correction value for the error line, so the number of error lines corresponding to the instantaneous interruption time can be calculated more accurately,
More accurate image information error determination can be realized.

6 and 7 show another example of the one-page receiving process described above.

First, the encoding / decoding unit 8 is set to the decoding mode (process 401), and the carrier monitoring process for detecting the detection signal CD of the carrier detector 12 to detect an instantaneous interruption (same as FIG. 5). Is started (process 402).

Then, it waits until the line end signal EOL arranged at the beginning of the received image information is detected (decision 40
(NO loop 3), when the first line end signal EOL is detected and the result of the determination 403 is YES, the line end signal EOL is detected, or the carrier monitoring process notifies the occurrence of an instantaneous interruption, or The received data is transferred to the encoding / decoding unit 8 until the calculation of the instantaneous interruption time is notified from the carrier monitoring process (process 404, determinations 405, 406,
407 processing loop).

Here, in the case where the occurrence of an instantaneous interruption is notified from the carrier monitoring process and the result of determination 406 is YES, the decoding process of the encoding / decoding unit 8 is terminated (process 40).
8) Notify the upper processing of the reception error (processing 40
7) The process ends in error.

Further, when the calculation of the instantaneous interruption time is notified from the carrier monitoring process and the result of the judgment 407 is YES, the instantaneous interruption time value set by the carrier monitoring process is input and the value is set. Variable TT for substituting for variable TC (process 410) and storing the cumulative value of the instantaneous interruption time
Is increased by the value of the variable TC at that time (process 4
11) and returns to the process 404.

When the line end signal EOL is detected and the result of judgment 405 is YES, it is checked whether or not the control return signal RTC is detected (decision 41).
2) If the result of determination 412 is YES, it means that the image information for one page has been normally received, and the upper processing is notified that the reception of the image information for one page has been normally completed (process 413). ), And ends this process.

When the result of determination 412 is NO, it means that the image information for one line has been received.
At this time, the encoding / decoding unit 8 that has decoded the image information for one line checks whether or not the processed line is detected as an error line (decision 414).

When the result of the judgment 414 is YES, the value of the error line counter EL for counting the number of error lines is incremented by 1 (step 415) and the variable T is set.
It is checked whether the value of T is smaller than the one-line minimum compensation time TL (decision 416).

When the cumulative value of the instantaneous interruption times between the line end signals EOL is long and the result of the judgment 416 is NO, the value of the variable TT is divided by the value of the one-line minimum compensation time TL, The value of the quotient obtained by the division is substituted into the variable TE (process 417).

Next, the value of the variable TE is added to the value of the error line counter EL, and the value of the error line counter EL is corrected by the number of error lines corresponding to the momentary interruption cumulative time that has occurred at that time (process 418). ), And it is checked whether or not the corrected value of the error line counter EL is equal to or more than a predetermined number EE (decision 419).

When the result of the judgment 419 is YES, it means that a large error has occurred in the image information received at that time, so the process shifts to the processing 409, the reception error is notified to the upper processing, and this processing is executed. To finish.

When the result of the judgment 416 is YES, the value of the error line counter EL is incremented by 1 (process 420), and the process proceeds to the judgment 419.

When the result of judgment 414 is NO and when the result of judgment 419 is NO,
Since it can be determined that the line has been normally received, the image signal for one line obtained at that time is transferred to the plotter 6 (process 421) and the image recording for the one line is performed.

Therefore, in this embodiment, the number of error lines is determined by using the cumulative value of the instantaneous interruption time.
Even when a plurality of instantaneous interruptions occur between the line end signals EOL, the error line number of the received signal can be accurately obtained.

In the above-described embodiment, the determination of the instantaneous interruption time is executed by the inter-carrier process shown in FIG. 5, but any other process can be used. Further, although the carrier detector is used in the above-described embodiment, the group 3 facsimile modem is usually provided with a carrier detecting function, and the carrier detecting function of this group 3 facsimile modem can be used.

[0068]

As described above, according to the present invention,
Since the error judgment of the received signal is executed by adding the number of errors corresponding to the momentary interruption time or the number of error lines corresponding to the accumulated momentary interruption time, an appropriate received signal is detected even when the momentary interruption occurs. An effect that an error determination process can be performed is obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a group 3 facsimile apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an example of reception processing.

FIG. 3 is a flowchart showing a part of an example of a one-page receiving process.

FIG. 4 is a flowchart showing another part of the example of the one-page receiving process.

FIG. 5 is a flowchart showing an example of carrier monitoring processing.

FIG. 6 is a flowchart showing a part of another example of the one-page receiving process.

FIG. 7 is a flowchart showing another part of another example of the one-page receiving process.

FIG. 8 is a schematic operation waveform diagram for explaining an inconvenience of a conventional device due to a momentary interruption of a signal.

[Explanation of symbols]

 1 control unit 2 system memory 12 carrier detector

Claims (5)

[Claims] 1. A facsimile apparatus which detects an error contained in received image information and, when the number of detected errors exceeds a predetermined value, sends a negative response as a response signal after the message, the instantaneous reception signal A momentary interruption time measuring means for measuring the interruption time and the number of errors corresponding to the momentary interruption time measured by the momentary interruption time measuring means are added to the number of errors included in the received image information received at that time, and When the addition result exceeds the specified value,
A facsimile apparatus comprising control means for sending a negative response as a response signal after a message. 2. A facsimile device that detects an error line included in received image information and, when the number of detected error lines exceeds a predetermined value, sends a negative response as a response signal after a message, in a received signal. The instantaneous interruption time measuring means for measuring the instantaneous interruption time and the number of error lines corresponding to the instantaneous interruption time measured by the instantaneous interruption time measuring means are calculated, and the calculated error line number is received at that time. A facsimile apparatus comprising a control means for adding a negative response as a response signal after a message when the addition result is added to the number of error lines included in the received image information and the addition result exceeds a predetermined value. 3. A facsimile apparatus that detects an error line included in received image information and, when the number of detected error lines exceeds a predetermined value, sends a negative response as a response signal after a message in a facsimile device. The momentary interruption time measuring means for measuring the momentary interruption time and the momentary interruption time measured by the momentary interruption time measuring means are divided by the minimum compensation time per line set at that time, which is equivalent to the quotient of the division. The number of error lines to be added is added to the number of error lines included in the received image information received at that time, and when the addition result exceeds a predetermined value, a control means for sending a negative response as a response signal after the message is provided. A facsimile machine characterized by being provided. 4. A facsimile apparatus which detects an error line included in received image information and, when the number of detected error lines exceeds a predetermined value, sends a negative response as a response signal after a message, in a facsimile device. The instantaneous interruption time cumulative measuring means for accumulatively measuring the instantaneous interruption time of the received signal between the signals and the instantaneous interruption interruption time measured by the instantaneous interruption time cumulative measuring means,
If it is smaller than the minimum compensation time per line set at that time, 1 is added to the number of error lines included in the received image information received at that time, and if the addition result exceeds a predetermined value, the message As a response signal of, while sending a negative response, when the momentary interruption cumulative time is larger than the minimum compensation time, the momentary interruption cumulative time,
Divide by the minimum compensation time, add the number of error lines corresponding to the quotient of the division to the number of error lines contained in the received image information received at that time, and if the addition result exceeds a predetermined value, a message A facsimile apparatus comprising control means for sending a negative response as a subsequent response signal. 5. A facsimile apparatus which detects an error line included in received image information and, when the number of detected error lines exceeds a predetermined value, sends a negative response as a response signal after a message, in a facsimile device. Instantaneous interruption time measuring means for measuring the instantaneous interruption time, and an instantaneous interruption time measuring means for accumulating the instantaneous interruption times measured by the instantaneous interruption measuring means between the line end signals, and the instantaneous interruption measured by the instantaneous interruption measuring means. When the time exceeds the predetermined value, a negative response is sent as a response signal after the message, while the instantaneous interruption time accumulated by the instantaneous interruption time accumulation measuring means is less than the minimum compensation time per line set at that time. Is smaller than 1, the number of error lines included in the received image information received at that time is incremented by 1, and when the addition result exceeds a predetermined value, a response signal after the message is output. Then, when a negative response is sent and the cumulative interruption time is longer than the minimum compensation time, the cumulative interruption time is divided by the minimum compensation time, and the number of error lines corresponding to the quotient of the division is calculated. , And a control means for adding a negative response as a response signal after the message when the addition result exceeds the predetermined value and is added to the number of error lines included in the received image information received at that time. And a facsimile machine.