JPH06141163A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To more surely receive picture information in a facsimile equipment for receiving the picture information from the facsimile equipment for transmitting scheduled dummy data prior to the picture information. CONSTITUTION:A decoder 101 decodes the received picture information to be outputted. A line detection means 102 performs line detection to the picture information and when EOL is detected for instance, discriminates that the decoding for one line is completed and sets a decoding flag 105. An RTC detection means 103 detects RTC from the picture information and an RTC validity/ invalidity judging means 104 discriminates the validity of RTC detected by the RTC detection means 103 based on the decoding flag 105.

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 can more reliably receive image information.

[0002]

2. Description of the Related Art Conventionally, when performing facsimile communication in G3 mode, as shown in FIG.
(Digital command signal) and TCF (training check) are sent out, and when CFR (reception preparation confirmation signal) returned from the called station in response to this is detected, an instruction to start reading the original information is issued and read. Image information corresponding to the received document information is transmitted (PIX).

At this time, if the calling station performs the memory transmission, the image information stored in advance in the image memory is promptly read in response to the instruction to start reading, so that the image information transmission timing (PIX ), It is possible to send reliably.

However, in the case where the calling station is a relatively inexpensive model that does not have a function of accumulating image information, the transmission original is pulled in, the original information is read, and encoded from the time when a reading start instruction is given. Therefore, there is a problem that the actual image information cannot be in time with the image information transmission timing (PIX) on the protocol.

Further, even in the facsimile machine of the called station, depending on its model, it takes time to prepare for receiving the image information, and there is a problem that the head of the image information sent from the calling station may not be received. .

[0006] Such a problem on the called station side is caused by communication between devices of different manufacturers, especially between devices having different functions and capabilities, or the called station side is relatively inexpensive and operates each part. Was particularly noticeable when the device was slow.

In order to solve such a problem, for example, in Japanese Unexamined Patent Publication No. 3-1657 / 1991, when performing facsimile transmission, an all white line (all bits are "0") is transmitted before sending image information. A facsimile machine is described which is designed to be sent as a dummy data.

[0008]

However, in the above-mentioned conventional technique, the 0 fill (“00 ... 000”) is destroyed by noise or the like, and EOL (line end code; “00 ... 000”).
001 ″). And since the continuous EOL sequence is defined as RTC (control return code; indicates the end of phase C), 0 fill E
When the change (destruction) to the OL occurs continuously, the dummy data is erroneously determined as the RTC, and the communication ends.

In order to solve such a problem, the inventors of the present invention have proposed a technique for making dummy data hardly change to EOL or RTC as all "1" data strings. Is promoting the adoption of this method,
In other companies' machines, 0 fill is still used as dummy data.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a facsimile apparatus which can surely receive image information sent from a transmitter that outputs 0 fill as dummy data. Especially.

[0011]

In order to achieve the above-mentioned object, in the present invention, a line detection means for detecting a line in image information and an RTC for detecting an RTC from the image information.
The facsimile device equipped with the detecting means is characterized in that the following means are further provided. (1) The RTC determination means for determining the validity of the detected RTC based on the line detection result is provided. (2) A timer means for counting the elapsed time of image information reception, and an RTC judging means for judging the validity of the detected RTC based on the line detection result and the elapsed time are provided. (3) A command analyzing means for analyzing the received command and an RTC determining means for determining the validity of the detected RTC based on the command analysis result and the line detection result are provided. (4) Pattern analysis means for analyzing the pattern of the received dummy data, and R for judging the validity of the detected RTC based on the pattern analysis result and the line detection result
And TC determination means.

[0012]

In the configuration (1) described above, if the RTC is detected, the reception is not stopped immediately, and if the RTC is ignored if the line detection has not been performed before that, the image information is preceded. Even if the dummy data that is sent out changes and is erroneously determined as RTC, this does not hinder the reception operation.

In the above configuration (2), when the RTC is detected, even if the line is not detected before that,
If the reception is stopped after a certain time has elapsed from the start of reception, even if an abnormality such as line detection cannot occur, it is not left as it is.

In the configuration (3) described above, as a result of analyzing the command, if the transmitter uses the dummy data (all "1" data) which is not easily transformed into the RTC, line detection is performed. As long as the reception is stopped even if not performed, the valid RTC will not be determined to be invalid.

In the above configuration (4), as a result of analyzing the pattern of the dummy data, if the dummy data is hard to be transformed into EOL or RTC, the detected RTC is judged to be valid, and therefore the valid RTC is erroneously invalid. There is no judgment.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. First, the hardware configuration of a facsimile apparatus to which the present invention is applied will be described with reference to FIG. Note that the facsimile machine of the present invention has all the essential components of the facsimile machine, but here, only the components necessary for explaining the present invention are shown.

In FIG. 9, the CPU 1 performs control processing of the entire facsimile apparatus and facsimile transmission control procedure (protocol) processing. The RAM 2 provides a work area used by the control program and stores data set by the operator from the operation display device 3. The operation display device 3 includes an operation unit and a display unit for operating the facsimile device.

The reading device 4 reads document information and converts it into image information of an electric signal. The printer 5 prints the received image information on recording paper and outputs it. The image processing device 6 performs encoding and decoding processing of image information. Image storage device 7
Stores the encoded image information.

The system controller 8 stores a program for controlling the entire facsimile. Communication control unit 9
Stores a program for controlling facsimile communication. The modem 10 modulates and demodulates image information,
Low speed mode (for transmission procedure signal: V21) and high speed mode (for transmission / reception of image information: V27ter, V29, V3)
3, V17) function. The network control device 11 has a function of connecting to a public network and an automatic call originating / receiving function.
The system bus 12 exchanges data between each device.

FIG. 1 is a block diagram showing the function of the main part of the first embodiment of the present invention, and shows the function of the communication control section 9.

The decoder 101 decodes the received image information and outputs it. The line detection unit 102 performs line detection on the image information, and when it detects EOL (line end code), for example, determines that the decoding for one line is completed and sets the decode flag 105.

The RTC detecting means 103 detects RT from the image information.
C (control return code) is detected. The RTC validity / invalidity determination means 104 determines the validity of the RTC detected by the RTC detection means 103 based on the decode flag 105.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG.

When the image information transmitted from the transmitting station is detected, the received image information is converted into the decoder 101 in step S10.
Is decoded in. In step S20, RTC
The detecting means 103 determines whether or not the RTC is detected. If RTC is not detected, step S3
At 0, it is determined whether or not the EOL is detected by the line detection unit 102, that is, whether or not the decoding for one line is completed. If the EOL is not detected, the process returns to step S10, and the decoding of the image information by the decoder 101 is continued.

On the other hand, when the line detecting means 102 detects EOL in step S30, step S4
At 0, the line detection means 102 causes the decode flag 105
Set. Therefore, the decode flag 105 is
This means whether or not reception of valid image information has started (during set) or not (during reset).

After that, when the RTC detecting means 103 detects the RTC in step S20, the RTC valid / invalid judging means 104 refers to the decode flag 105 in step S50. Here, if the decode flag 105 is not set, it means that the RTC has been detected in a state in which no image information of one line has been decoded, so it is determined that the dummy data has changed. Therefore, the current RTC is ignored, and the process is performed in step S1.
Return to 0.

On the other hand, if the decode flag 105 is set, it means that the RTC has been detected after the reception of the valid image information is started, and therefore it is determined to be valid. In step S80, the RTC validity / invalidity determination is made. The means 104 instructs the decoder 101 to stop decoding.

According to the present embodiment, even if the RTC is detected, the decoding is not immediately stopped, and the RTC is ignored unless line detection is performed before that, so that the RTC is transmitted prior to the image information. Even if the dummy data changes and the RTC is erroneously determined, the receiving operation is not hindered by this.

FIG. 3 is a block diagram showing the functions of the essential parts of the second embodiment of the present invention, in which the same symbols as those used above represent the same or equivalent portions.

The present embodiment is characterized in that a clock means 106 and a timeout flag 107 are added to the structure of the first embodiment. The time measuring means 106 measures the elapsed time of image information reception, and sets the timeout flag 107 when the elapsed time exceeds the scheduled time.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG.

When the image information carrier sent from the transmitting station is received in step S8, the time measuring means 106 starts a timer of, for example, 3 seconds in step S9.

Thereafter, if it is determined in step S30 that the EOL has not been detected, it is determined in step S32 whether a time-out has occurred. If the time is out, the time out flag 1 is set in step S34.
07 is set.

Thereafter, when RTC is detected in step S20 and it is confirmed in step S50 that the decode flag 105 is not set, in step S60, the RTC valid / invalid decision means 104 refers to the time out flag 107. However, if this is set, the stop of decoding is instructed in step S80.

According to the present embodiment, when RTC is detected, decoding is stopped if a certain time (3 seconds in this embodiment) has elapsed from the start of reception even if line detection has not been performed before that. Therefore, even if an abnormality that cannot detect the line occurs, the line is not left as it is.

FIG. 5 is a block diagram showing the function of the main part of the third embodiment of the present invention, and the same symbols as those used above represent the same or equivalent portions.

The present embodiment is characterized in that the command analyzing means 108 and the unique flag 109 are added to the structure of the first embodiment. This command analysis means 108
Detects the NSS or DCS sent from the transmitting station, and sets the unique flag 109 when the NSS is detected.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG.

In step S1, the command analysis means 10
It is determined by 8 whether NSS or DCS is detected. If it is determined in step S2 that the detected command is NSS, it is determined that the transmitter is its own device, and the unique flag 109 is set in step S3. Set.

On the other hand, when DCS is detected, it is determined that the transmitter is another company's machine, and the unique flag 1 is set in step S4.
09 is reset. In step S5, C is sent to the transmitting station.
Return FR.

After that, when RTC is detected in step S20 and it is confirmed in step S50 that the decode flag 105 is not set, the RTC valid / invalid judging means 104 refers to the unique flag 109 in step S61. .

When the unique flag 109 is set, the transmitter is the own machine and RTC is used as dummy data.
Since all "1" data that is hard to be transformed into is output,
Regardless of the decode flag 105, it is determined that the RTC is valid, and in step S80, the stop of decoding is instructed.

According to the present embodiment, when the transmitting station is its own machine and there is a low possibility of erroneously detecting the RTC, the decoding is stopped even if the line detection is not performed, which is effective. The RTC is never judged invalid.

FIG. 7 is a block diagram showing the functions of the essential parts of the fourth embodiment of the present invention, and the same reference numerals as those used above denote the same or equivalent portions.

The present embodiment is characterized in that the pattern analysis means 110 and the analysis result flag 111 are added to the configuration of the first embodiment. This pattern analysis means 110
Analyzes the pattern of the decoded dummy data,
The analysis result flag 111 is set when the dummy data pattern is a data pattern (for example, all "1" data) that is not easily transformed into EOL or RTC.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG.

When the image information sent from the transmitting station is received in step S10, it is determined in step S11 whether either the decode flag 105 or the analysis result flag 111 is set. Has also been reset, the process proceeds to step S12.

In step S12, the pattern analysis means 1
It is determined whether or not the analysis result counter provided in 10 has reached the planned value.

If the analysis result counter has not reached the predetermined value, the pattern analysis means 110 analyzes the pattern of the dummy data received in step S14. If the dummy data pattern is all "1" data that is not easily transformed into EOL or RTC, the analysis result counter is incremented in step S15.

In this way, the dummy data analysis is performed, and when it is determined in step S12 that the analysis result counter has reached the predetermined value, the analysis result flag 111 is set in step S13.

After that, in step S20, RTC is detected, and when it is confirmed in step S50 that the decode flag 105 is not set, in step S62, the RTC valid / invalid decision means 104 refers to the analysis result flag 111. To do.

If the analysis result flag 111 is set, the demy data has a pattern that is difficult to be transformed into EOL or RTC, and therefore it is highly likely that the RTC is valid. To be done.

According to this embodiment, the dummy data is EOL.
If the detected RTC is judged to be valid if it is a pattern that is unlikely to be transformed into
It will not be judged that C is invalid.

[0054]

As described above, according to the present invention, the following effects can be achieved. (1) According to the invention described in claim 1, even if the RTC is detected, the reception is not stopped immediately, and the RTC is ignored if the line detection is not performed before that. The dummy data sent as
Even if an erroneous determination is made, this does not hinder the reception operation. (2) According to the invention described in claim 2, when the RTC is detected, even if the line is not detected before that, the reception is stopped after a certain time has elapsed from the start of the reception. Even if an abnormality that cannot detect the line occurs, it is not left as it is. (3) According to the invention described in claim 3, line detection is performed when the transmitting station is the own machine and employs dummy data (all “1” data) that is not easily transformed into the RTC. If you don't have it
It will not be judged that C is invalid. (4) The pattern of the received dummy data is detected, and if the dummy data is a pattern that is unlikely to be transformed into EOL or RTC, the detected RTC is determined to be valid. Therefore, the valid RTC is also determined to be invalid. There is no end.

[Brief description of drawings]

FIG. 1 is a functional block diagram of a first embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the first embodiment.

FIG. 3 is a functional block diagram of a second embodiment of the present invention.

FIG. 4 is a flowchart showing the operation of the second embodiment.

FIG. 5 is a functional block diagram of a third embodiment of the present invention.

FIG. 6 is a flowchart showing the operation of the third embodiment.

FIG. 7 is a functional block diagram of a fourth embodiment of the present invention.

FIG. 8 is a flowchart showing the operation of the fourth embodiment.

FIG. 9 is a block diagram of a facsimile apparatus to which the present invention is applied.

FIG. 10 is a diagram showing a G3 protocol.

[Explanation of symbols]

1 ... CPU, 2 ... RAM, 3 ... Operation display device, 4 ... Reading device, 5 ... Printing device, 6 ... Image processing device, 7 ... Image storage device, 8 ... System control unit, 9 ... Communication control unit, 10 ... Modem, 11 ... Network control device, 12 ... System bus, 101
... Decoder, 102 ... Line detecting means, 103 ... RTC
Detection means 104 ... RTC validity / invalidity determination means 105
... Decode flag, 106 ... Timing means, 107 ... Timeout flag, 108 ... Command analysis means, 109 ... Unique flag, 110 ... Pattern analysis means, 111 ... Analysis result flag

Claims (4)

[Claims] 1. A facsimile apparatus which receives image information from a facsimile apparatus which sends scheduled dummy data prior to the image information, includes a line detection means for performing line detection on the received image information and an RTC from the received image information. A facsimile apparatus comprising: an RTC detecting means for detecting; and an RTC judging means for judging the validity of the RTC detected by the RTC detecting means based on a line detection result. 2. In a facsimile device that receives image information from a facsimile device that sends scheduled dummy data prior to the image information, a line detection unit that performs line detection for the received image information, and an RTC from the received image information. RTC detecting means for detecting, time measuring means for measuring the elapsed time of image information reception, the R based on the line detection result and the elapsed time.
A facsimile machine, comprising: an RTC determination means for determining the validity of the RTC detected by the TC detection means. 3. In a facsimile device which receives image information from a facsimile device which sends scheduled dummy data prior to the image information, a command analyzing means for analyzing a received command and a line for line detection for the received image information. Based on the detection means, the RTC detection means for detecting the RTC from the received image information, the command analysis result and the line detection result,
A facsimile machine, comprising: an RTC determining means for determining the validity of the RTC detected by the RTC detecting means. 4. In a facsimile device that receives image information from a facsimile device that sends scheduled dummy data prior to the image information, a line detection unit that performs line detection on the received image information and an RTC from the received image information. Based on the RTC detecting means for detecting, the pattern analyzing means for analyzing the pattern of the received dummy data, the pattern analysis result and the line detection result,
A facsimile machine, comprising: an RTC determining means for determining the validity of the RTC detected by the RTC detecting means.