JPH03220862A - Facsimile picture recording device - Google Patents

Abstract

PURPOSE:To record a facsimile picture without providing of a large capacity temporary storage device by bringing a data video recording means into a video recording state prior to the start of reception of a facsimile picture signal and outputting a dummy signal distinguished from the facsimile picture signal when no facsimile picture signal is received to the data video recording means. CONSTITUTION:A video recording start means 12 predicts the transmission of a facsimile picture signal according to a communication protocol of a facsimile equipment to bring a data video recording means in advance to the video recording state prior to the start of reception of a picture signal and records an EOL code 21 onto a recording medium 3. Whether or not the EOL code 21 is received in a reception data buffer 1 is checked and when the EOL code 21 is found out, one line data 20 after the reception is recorded onto the recording medium 3. When the EOL code 21 is not found out, the video recording end by an RTC code 23 or the like is discriminated and a dummy line output section 2 by a command of a video recording data generating means 8 outputs a dummy line code 27 in place of the one-line data 20 and the code is recorded on the recording medium 3 by the data video recording means 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a FAX image recording device provided in a FAX (facsimile).

[Conventional technology]

A FAX image recording device that uses a magnetic tape device is equipped with a large-capacity storage device that can be written at high speed, such as an IC memory. There is.

[Problems to be Solved by the Invention] By the way, due to the FAX communication protocol, the time from when it is determined that the reception of a FAX image signal has started to when the image signal is actually transmitted is short, and it is difficult to use a FAX device such as a magnetic tape device. If you try to record a FAX image using a recording device that takes some time to transition from a recording standby state to a recording state, recording will not start in time. Therefore, the conventional configuration described above includes a large-capacity time storage device that is capable of high-speed writing.

However, this poses a problem in that the circuit and control become complicated.

[Means to solve the problem]

In order to solve the above-mentioned problems, the FAX image recording device of the present invention is a FAX image recording device equipped with a data recording means for recording a FAX image signal. A recording start means that puts the data recording means into a recording state, and a dummy signal output section that outputs a dummy signal that can be distinguished from a FAX image signal to the data recording means when a FAX image signal is not received in the recording state. It is characterized by

[For production]

According to the above configuration, before starting to receive the FAX image signal, F.
a recording start means that puts the data recording means into a recording state on an AX communication protocol; and a dummy signal output section that outputs a dummy signal distinguishable from a FAX image signal to the data recording means when the FAX image signal is not received in the recording state. Therefore, the data recording means is already in the recording state when receiving the FAX image signal, and records the dummy signal until reception of the image signal actually starts. Moreover, since this dummy signal can be distinguished from the FAX image signal, it can be deleted during playback. Therefore, even if the data recording means requires a little time to transition from the recording standby state to the recording state, it is possible to use F
You can record AX images.

〔Example〕

An embodiment of the present invention will be described below based on FIGS. 1 to 7.

First, FIG. 6 shows the format of the FAX image signal.

This FAX image signal format complies with Recommendation T4 of the CCITT (International Telegraph and Telephone Consultative Committee).
Starting from the EOL code 21, one line data 20, 20, the same number as the scanning lines, and the RTC code 23 indicating the end of the image signal, that is, six consecutive EOL codes 21, 21.
It is composed of...

The formant of each line data 20 is the image data 22
and an EOL code 21, and the image data 22 includes a run length code 2 indicating the length of white, as shown in FIG.
4 and a run length code 25 indicating the length of black are arranged alternately.

Note that when the transmission time of the 1-line data 20 is shorter than the minimum transmission time T of the encoded scanning line light, FIL is added after the image data 22, as shown in FIG.

In the FAX image recording device of the present invention, l line data 20
In addition, a dummy line 26 as a dummy signal shown in FIG. 5 is used.

Here, the dummy line 26 is used when a FAX image signal is not received even if the recording device enters the recording state, or when the
When recording an AX image signal, the recording speed is faster than the receiving speed of the image signal, so that the l-line data 20 (Fig. 7) to be recorded is not ready in the reception data buffer described later. , is pseudo data recorded in place of the one line data 20. Therefore, during reproduction, this dummy line 26 is unnecessary and is deleted.

The format of the dummy line 26 is composed of data 27 and an EOL code 21, similar to the 1-line data 20, in accordance with CCITT recommendation T4, but the data 2
7 is different from the one-line data 20, and is composed of a dummy line code 28 and a variable length r01010101J code 29. And on the dummy line code 28,
A code other than the make-amp code and the terminating code used in MH encoding is used so that the dummy line 26 can be distinguished from the l-line data 20 during reproduction.

Assuming that the total run length of one line is 2048, makeup codes corresponding to 2112 or more are not used, so dummy line codes 28 are selected from among these, such as ro o o o o.

011111J is used.

FIG. 1 is a block diagram of a FAX recording and reproducing apparatus according to the present invention, which includes a FAX communication means 13 that performs FAX communication via a communication line, a reception data buffer l that temporarily stores received image signals, and a dummy signal output section. A dummy line output section 2, a recording medium 3 such as a magnetic tape for recording image signals, a line deletion section 4, a FIL output section 5, a blank line output section 6, a recording start means 12, a control for controlling recording and playback. It mainly consists of section 7.

The control section 7 includes a recorded data generating means 8, a data recording means 9, a recorded data reproducing means 10, and a reproduced data generating means 11.

In the above configuration, first the recording operation is performed as shown in Fig. 1 and Fig. 2.
This will be explained based on the flowchart shown in the figure.

As step 0 (hereinafter, step is abbreviated as S), FA
Based on the X communication protocol, the recording start means 12 predicts that a FAX image signal will be transmitted, and shifts the data recording means 9 to a recording state in advance before starting to receive the image signal. First, the data recording means 9 records the EOL code 21 on the recording medium 3 (Sla). Then, it is checked whether the EOL code 21 (see FIG. 6) has been received in the data receiver 13 (Sl). And EOL code 2
1 is found, the data recording means 9 records the received l line data 20 on the recording medium 3 (S2). S3 is
31, it is checked whether the next EOL code 21 (the next one line of data 20) is received in the reception data buffer 1. When EOL code 21 (1 line data 20) is found, the process returns to S2 and 1 line data 20 is found.
Repeat the recording.

If the EOL code 21 (one line data 20) is not found in S3, it is determined whether recording has ended using the RTC code 23 or the like (S4). When it is determined that the recording has ended, the RTC code 23 is recorded and the recording is ended (S9).

It is not determined that recording has ended in S4, or EOL is detected in Sl.
If the code 21 is not found, the dummy line output section 2 outputs one line data 2 according to a command from the recorded data generation means 8.
A dummy line code 27 is output instead of 0, and the data recording means 9 records this on the recording medium 3 (S5). Then, it is checked whether the new EOL code 21 (L line data 20) has been received (S6a), and the EOL code 21 (L line data 20) is checked (S6a).
When the 1 line data 20) is found, the EOL code 21 is recorded (S6b), the process returns to S2, and the 1 line data 20 is recorded.
The EOL code 2I (1 line data 20
) is not found, it is determined whether recording has ended using the RTC code 23 or the like (S7).

If it is determined that the recording has ended, the process jumps to S9, and if it is determined that the recording has ended, it records the "rolololol" code 29, and
Return to ea (S8). Therefore, with 56a=38,
variable length r01010101J until EOL code 21 (l line data 20) or RTC code 23 is received.
Recording at number 29 will be repeated.

In the above, the recording start means 12 predicts that a FAX image signal will be transmitted, and shifts the data recording means 9 to the recording state before starting to receive the image signal. For example, in the FAX communication protocol, the FAX sender uses TCF () training check).
When the fax is sent, if the reception status is good, the fax communication means 13 will respond with CFR (reception readiness confirmation).
At this time, the recording start means 12 causes the data recording means 9 to
All you have to do is shift it to the recording state.

Next, the reproduction operation of this apparatus will be explained based on the flowcharts of FIG. 1 and FIG. 3.

At SIO, the recorded data reproducing means IO operates and starts reproducing from the recording medium 3, but at this point, it has not yet outputted the reproduced data. Then, the search for the EOL code 21 is started and repeated until it is found (Sll). When the EOL code 21 is found, output of reproduced data begins.

Next, it is checked whether there is an EOL code 21 or a dummy line code 28 following this EOL code 21 (312-513). If it is neither, the process starts to combine the one line data 20 (314) and continues until the next EOL code 21 comes, and then returns to Sl.

When the dummy line code 28 is found in S13, the dummy line deletion section 4 notifies the reproduction data generation means 11 that the dummy line 26 is being reproduced. In response to this, the reproduction data generation means 11 causes the FIL output unit 5 to output FIL as reproduction data during the reproduction period of the dummy line 26 in order to maintain the continuity of reproduction data. And F.I.
If the L output period exceeds 5 seconds, at that point, FIL
The output is stopped and the blank line output unit 6 is made to output a white run length code 24J of the blank line data rEOL code 21+the number of scanning line pixels. This switching is to comply with CCITT Recommendation T4, which states that ``the maximum transmission time of encoded scanning data is 5 seconds or less.''

If EOL code 21 is found in S12, EOL code 2
Since 1 is consecutive, it is checked whether it is RTC code 23 (S15). If it is determined that the RTC code is 23, the playback operation is terminated (316), otherwise the process returns to Sll.

The fourth section describes the temporal flow of recorded data and playback data when recording and playback is performed using the FAX image recording device of the present invention.
As shown in the figure. Note that here, a case is illustrated in which the recording/playback speed of the image signal is twice the receiving speed, and the output speed of the playback data is the same as the receiving speed.

As an example, FIG. 3A shows the passage of time of received FAX image signals, and shows that l line data 31 to 35 are received sequentially.

FIG. 6(, b) shows the temporal arrangement of the recorded data when the above FAX image signal is recorded on the recording medium 3. Dummy line 60.1 line data 41, dummy line 61, l line data 42, 43, 44, and dummy line 62.1 line data 45 are sequentially recorded. Here, the l line data 41 to 45 correspond to the l line data 31 to 35, respectively.

While the first line of data 31 is being received, the dummy line 60 is being recorded because there is no previous data. 1
When the EOL code 21 of line data 31 is detected, 1 line data 41 corresponding to 1 line data 31 is recorded, but by the end of this recording, the EO of 1 line data 32 is
Since L code 21 is not detected, dummy line 6 is detected again.
1 is recorded. EOL code 21 of 1 line data 32
When this is detected, 1 line data 42 is recorded. Since the EOL code 21 of 1 line data 34 and 35 has been detected by the end of this recording, 1 line data 43 and 44 are recorded following 1 line data 42. It will be recorded. Thereafter, recording is performed in the same manner.

FIG. 3(c) shows the temporal arrangement of the reproduced data when the recorded data recorded on the recording medium 3 is reproduced, and the 1-line data 51, the FIL 71, and the 1-line data 52 to 55 are They are output sequentially. Here, 1 line data 51 to 55 are 1 line data 41 to 4, respectively.
It corresponds to 5.

When a code other than the dummy line code 28 after the EOL code 21 of the dummy line 60 is detected, output of reproduced data starts, and 1 line data 51 corresponding to the first 1 line data 41 is output. At the time of completion, since the dummy line 61 is being reproduced, the FIL 71 is output. If the FIL output period exceeds 5 seconds, the FIL output is stopped and blank line data is output as described above. Then, the EOL code 21 of the dummy line 61
When detected, one line data 52 corresponding to one line data 42 is output. In this example, when the output of 1 line data 52 is finished, two EOL codes 21 of 1 line data 43 and 44 have already been detected, so following 1 line data 52, 1 line data 53 is detected. - 54 is output, and reproduction is performed in the same manner thereafter.

As described above, in this embodiment, the data recording means is already in the recording state when receiving the FAX image signal, and not only records the dummy line 26 until reception of the image signal actually starts, but also records the FAX image signal. Even during signal reception, when the next line of data 20 is not prepared in the reception data buffer 1, the dummy line 26 is recorded. Therefore, since the data recording means 9 is always in the recording state when recording a FAX image signal, the data recording means 9 can be selected regardless of whether it takes time to transition from the recording standby state to the recording state. For example, even if data recording means 9, such as a magnetic tape device, which requires a relatively long transfer time is employed, FAX images can be recorded without the need for a large-capacity storage device capable of high-speed writing. Moreover, since the extra inserted dummy line 26 can be distinguished from the image signal, it can be easily deleted during playback.

However, simply deleting the dummy line 26 may interrupt the output of reproduced data. Therefore,
In this embodiment, in such a case, harmless FIL is output as reproduction data. Note that it is possible that the period of FIL output becomes so long that it no longer complies with CCITT's Recommendation T4, so in this case, in this embodiment, FIL output is interrupted and instead, for example, blank line data is output. , while maintaining the continuity of playback data and complying with CCITT Recommendation T4.

〔Effect of the invention〕

As described above, the FAX image recording device of the present invention includes a recording start means that sets the data recording means to the recording state in advance on the FAX communication protocol before starting to receive the FAX image signal, and a FAX image signal is received in the recording state. Since the data recording means S is equipped with a dummy signal output section that outputs a dummy signal that can be distinguished from the FAX image signal, the data recording means is already in the recording state when receiving the FAX image signal, and the image signal cannot be received. A dummy signal is recorded until it actually starts.

Moreover, since this dummy signal can be distinguished from the FAX image signal, it can be deleted during playback. Therefore, even if the data recording means takes a little time to transition from the recording standby state to the recording state, it is possible to record FAX images without the need for a large-capacity storage device capable of high-speed writing. This simplifies the circuitry and control of the FAX image recording device.

[Brief explanation of drawings]

An embodiment of the present invention is shown in FIGS. 1 to 7. FIG. 1 is a block diagram of a FAX image recording device of the present invention. FIG. 2 is a flowchart for explaining the FAX image recording operation. FIG. 3 is a flowchart illustrating the reproduction operation of a FAX image. FIG. 4 is an explanatory diagram showing the temporal flow of recorded data and reproduced data. FIG. 5 is an explanatory diagram of a dummy line formant. FIG. 6 is an explanatory diagram of the formant of a FAX image signal. FIG. 7 is an explanatory diagram of the format of l-line data. 1! 2 is the dummy line output section (
3 is a recording medium, 4 is a dummy line deletion section, 5 is a FIL output section, 6 is a blank line output section, 7
1 is a control unit, 8 is a recording data generation means, 9 is a data recording means, 10 is a recording data reproduction means, 10 is a reproduction data generation means, 12 is a recording start means, 21 is an EOL code, 26 is a dummy line, and 2 is data , 28 is a dummy line code,
29 is the ro1ototot code. dust

Claims (1)

[Claims] 1. F equipped with data recording means for recording FAX image signals
The AX image recording device includes a recording start means that sets the data recording means to a recording state in advance according to a FAX communication protocol before starting to receive a FAX image signal, and a recording start means that sets the data recording means to a recording state in advance according to a FAX communication protocol before starting to receive a FAX image signal, and a recording start means that sets the data recording means to a recording state in advance when the FAX image signal is not received in the recording state.
A FAX image recording device comprising: a dummy signal output section that outputs a dummy signal distinguishable from an image signal to data recording means.