JPS6379469A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To shorten a communication time by detecting a line termination signal and a control reset signal from a transmission side and inputting picture information of the quantity corresponding to the unused quantity to a data buffer of its own. CONSTITUTION:When the transmission side receives an MCF command from a receiving side, a control command analyzing circuit 17 analyzes it and obtains the information of the unused quantity of the data buffer of the receiving side. The control circuit 18 of the transmission side presets a value obtained by subtracting a maximum value at the time of coding one line from the value of the unused quantity to a data transfer quantity counter 13. The receiving side transfers the unused quantity of the data buffer 22 of its own to the transmission side for every frame and the transmission side transmits the picture information of the value obtained by subtracting the maximum value of the encoded data of the one line from the unused quantity, an EOL signal and a RTC signal as one frame to the receiving side and the receiving side detects the EOL signal and the RTC signal, thereby, the picture information of the quantity corresponding to the unused quantity of the data buffer 22 of its own is inputted and sequentially decoded and recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a facsimile device, and particularly to a facsimile device that can communicate original images in a short time.

2. Description of the Related Art Conventionally, in this type of apparatus, as shown in FIG. 4, an original image is read by a reading device 1 on the transmitting side, and the read image signal is encoded by an encoding circuit 2.

The encoded image signal is modulated by the modem 3 and transmitted via the line control circuit 4.

On the other hand, both transmitted signals are input via the line control circuit 4 on the receiving side, demodulated by the modem 3, temporarily stored in the data buffer 5, decoded by the decoding circuit 8, and printed on recording paper by the recording device 7. recorded.

The above transmission/reception procedure is as shown in FIG.
The called terminal identification signal O8I and the digital identification signal DIS are transmitted to the transmitting side, and the transmitting side transmits the transmitting terminal identification signal TSI, the non-standard function setting signal NSS, and the training check T (3
When F is transmitted to the receiving side and the receiving side transmits a reception preparation confirmation signal OF to the transmitting side, image signals are transmitted and received.

Next, the sending side sends an image signal, a control return signal RTO1, and a procedure end signal EOP, and the receiving side sends a message confirmation signal M.
After transmitting OF, the transmitting side transmits a disconnection command signal DON, and the transmitting/receiving procedure ends.

In the above image signal transmission, as shown in FIG. 6(A), a line end signal EOL is added to each line of code data to indicate the separation of scanning lines and to enable resynchronization after error detection. As shown in Figure 6 CB), if the signal transmission time per scanning line (the sum of the data transmission time and the EOL signal transmission time) is smaller than the minimum transmission time T, the gOL A fill is added before the signal.

Problems to be Solved by the Invention However, with such a configuration, files that are not necessary as original image information must also be transmitted via the telephone line, which increases the communication time and reduces the time required for the telephone line. There is a problem that usage fees are high.

In order to avoid adding fills, there is a method in which two telephone lines are used, and the sending side sends the image signal and the receiving side sends a response, but in order to use two telephone lines, the method described above Unable to solve problems.

There is also a method of transmitting and receiving by dividing the frequency of one telephone line, but bandpass filters and the like are expensive, and there are problems in that transmitting and receiving is impossible on a telephone line with a poor frequency band.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an inexpensive facsimile device that can shorten communication time without adding a fill or using two telephone lines. With the goal.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides means for detecting the unused amount of the data buffer in a facsimile machine on the receiving side, and detecting the unused amount of the data buffer detected by the detecting means. means for transmitting quantity data to a sending facsimile machine for each frame, means for detecting a line end signal, means for detecting a control return signal, and detecting the line end signal and control return signal. means for accumulating received image information in the data buffer, and means for setting an amount of image information to be transmitted for one frame in a facsimile machine on a transmitting side according to the unused data in the data buffer from the receiving side; The present invention is characterized in that it includes means for adding a line termination signal before transmission image information of a frame, and adding a control return signal afterward and transmitting the signal to a receiving side facsimile machine.

According to the above-described configuration, the facsimile machine on the sending side adds a line end signal and a control return signal before and after each frame of image information set according to the unused amount of the data buffer on the receiving side, and transmits the data. However, by detecting the line end signal and control return signal from the transmitting side, the facsimile machine on the receiving side inputs firefly image information into its own data buffer according to the unused amount.

Therefore, even if the recording time of the facsimile machine on the receiving side is longer than the data transmission time, no data is lost, so the facsimile machine on the transmitting side does not need to add a fill, and the communication time is shortened.

EXAMPLES Hereinafter, the present invention will be described in detail with reference to the drawings. 1 is a block diagram showing an embodiment of a facsimile device according to the present invention, FIG. 2 is a timing chart of main signals of the device of FIG. 1, and FIG. 3 is a signal sequence of the device of FIG. 1. It is a diagram.

In FIG. 1, 11 is a reading device that reads a document image;
12 is an encoding circuit that encodes the image signal read by the reading device 11 and adds a line end signal EOL and a control return signal ratio TC before and after the image information for each frame, and 13 is a control circuit that will be described later. Preset signal P from
This is a data transfer amount counter that can be pre-sensed by R and is decremented each time data (encoded signal) is applied from the encoding circuit 12 to the modem described later. The counter 13 constitutes a transmitter 1o.

In addition, 14 is CPC (Continue Page
15 is an encoding circuit 1 which creates a facsimile control command such as
A modem that modulates the encoded signal from 2 and demodulates the received modulated signal; 1θ is a line control circuit;

A control command analysis circuit 18 that analyzes received facsimile control commands is a control circuit.

Furthermore, 19 is an RT (E detection circuit) that outputs a TO detection signal SR when the control return signal TC is detected from the received signal, and 20 is an RT (E detection circuit) that outputs the TO detection signal SR when the control return signal TC is detected from the received signal. 21 is an AND gate that outputs the EOL detection signal sg to the control circuit 18, and 21 is an AND gate that extracts the demodulated signal from the modem 15 using the control signal SG from the control circuit 18; 22 is the demodulated signal that is output from the modem 16; 23 is a data buffer unused amount detection circuit that detects an unused amount of the data buffer 22; 24 is a decoding circuit that decodes the demodulated signal from the data buffer 22 into an image signal; 25 is a recording device that records an image on recording paper using an image signal from a decoding circuit 24, and these RTO detection circuit 19, FiOL
Detection circuit 2o, AND gate 21, data buffer 22
, data buffer unused amount detection circuit 23, decoding circuit 2
4 and the recording device 26 constitute a receiving section 26.

The upper part of FIG. 2 shows the structure of a message confirmation signal MOF, which is a frame of image information from the transmitting side and a response signal from the receiving side. A signal EOL is added, and later a control return signal RTC is added.

In this figure, the BOL signal is 000000000001 + additional bit, and the additional bit is ``1'' when the next line is one-dimensionally encoded.
", and is "0" when two-dimensionally encoded.

The image information is transmitted so that one page is divided into multiple frames and the length of the image information of each frame is variable, and the length is determined by the unused amount of the receive data buffer sent from the receiving side. The length of the next frame is determined by the size of .

The RTo signal is a continuous signal of ooooOoOooooll, and since it is impossible for the RTC signal to exist in the image information, the receiving side cannot detect the end of one frame by detecting the TC signal. can.

Also, CPC is a non-standard response indicating that there is still image information to be sent by the end of the page, and MC
The F signal is a non-standard response expanded to include information on the unused amount of the data buffer 22 on the receiving side in the facsimile information field (PIF).

Next, to explain the operation of the embodiment according to the above configuration, first, as shown in FIG.
After transmitting the non-standard function identification signal NSF, which includes information on the size of its own data buffer 22 detected by the data buffer unused amount detection circuit 23, ! Call terminal identification signal C
8I and a digital identification signal DIS, the transmitting side transmits a transmitting terminal identification signal TSI, a non-standard function setting signal NSS, and a training check TCP, and the receiving side transmits a reception preparation confirmation signal CFR.

When the preparation for transmission and reception is completed, in FIG. 1, the reading device 11 on the sending side reads the original image, the encoding device 12 encodes the read image signal, and the data transfer amount counter 13 is included in the N8F signal from the receiving side. Receive data buffer 2
A value obtained by subtracting the maximum value of one encoded line of information from the size of 2 is preset.

Next, as shown in FIG. 2A, the EO
After the L signal is sent out, encoded image information is sent out,
It is transmitted to the receiving side via the modem 15 and line control circuit 16. At this time, the data transfer counter 13 subtracts and counts the number of data transferred from the encoding circuit 12 to the modem 16,
As shown in FIG. 2B, a signal CY that turns on when the count value reaches "0" is output to the control circuit 18.

When the signal OY is turned on, the control circuit 18 controls the encoding circuit 1.
2 to send a control return signal RTC, and the encoding circuit 12 completes the encoding of the line being encoded upon receiving this request, as shown in FIGS. 2C and 3.
The sent diameter ratio To signal is sent out.

After sending the RTO, the control circuit 18 switches the modem 1g to low-speed mode and sends the CPC created by the control command creation circuit 14.
and wait for a response from the receiving side.

On the other hand, on the receiving side, when the EOL detection circuit 2o detects the EOL signal, which is a high-speed signal, the gOL detection signal SE to the control circuit 18 is turned on as shown in Fig. 2, and the control circuit 18 turns on as shown in Fig. 2E. As shown, the signal SO for the AND gate 21 is turned on. Therefore, the received E
The OL signal and image information are input to the data buffer 22.

Furthermore, when one frame of image information is received, the RTC detection circuit 19 detects the RTC signal, and the RTO detection signal SE to the control circuit 18 is turned on as shown in FIG. And gate 21 as shown in
Turn off signal SG. Therefore, the image information input to the data buffer 22 is interrupted, and the image information in the data buffer 22 is sequentially decoded by the decoding circuit 24 and sequentially recorded on recording paper by the recording device 25.

Next, the control circuit 18 on the receiving side switches the modem 15 to low-speed mode, and the control command analysis circuit 17 analyzes the received control command, and if the control command is ape, there is untransmitted content in the same page image information. judge it as something.

In this case, the control command creation circuit 14 uses the data buffer 2 detected by the data buffer unused amount detection circuit 23.
2 unused amount information in the facsimile information field (PI
F), a MOF command is created as a non-standard response with this PIF added, and is sent to the transmitting side via the modem 15 and line control circuit 1θ as shown in FIG. 2H and FIG. 3.

On the other hand, if the control command analysis circuit 17 on the receiving side analyzes the received control command and the received control command is not OPO, it is determined that the image information communication for one page has been completed.

In this case, the reception control command is the message end signal RO.
If it is a signal such as M or multi-page signal MP8, it is determined that there is a next document, and if it is a procedure end signal, such as Eop, it is determined that there is no next document, and processing is performed to that effect.

When the transmitting side receives an MCF command from the receiving side, the control command analysis circuit 17 analyzes it and obtains information on the unused amount of the data buffer 22 on the receiving side. The control circuit 18 on the transmitting side presets the data transfer amount counter 13 to a value obtained by subtracting the maximum value when one line is encoded from the size of this unused amount, and this value becomes the length of the image information of the next frame.

Similarly, the receiving side reports the unused amount of its own data buffer 22 to the transmitting side for each frame, and the transmitting side calculates the maximum value of one line of encoded data from the unused amount of the receiving side's data buffer 22. The image information of the reduced value, the previous and subsequent EOL signals, and the RTC signal are transmitted as one frame to the receiving side, and the receiving side detects the got signal, It, and TO times the signal to adjust the amount of unused data in its own data buffer 22. A certain amount of image information is input, sequentially decoded and recorded.

When the sending side completes the image transmission of one page, it notifies the receiving side by adding an EOP signal, ROM signal, MPS signal, etc. after the last frame RT (3 signals) as shown in Figure 3. sends a message confirmation signal MCF, and the sending side sends a disconnection command signal DCN.

DETAILED DESCRIPTION OF THE INVENTION As described above, the present invention includes means for detecting an unused amount of data buffer in a facsimile machine on the receiving side, and transmitting the unused data of the data buffer detected by the detecting means for each frame on the sending side. means for transmitting to a facsimile machine, means for detecting a line end signal, means for detecting a control return signal, and storing one frame of received image information in the data buffer by detecting the line end signal and the control return signal. means for setting the amount of image information to be transmitted for one frame in the facsimile machine on the sending side according to the data buffer unused amount data from the receiving side;
Since it is equipped with a means for adding a line termination signal before the transmission image information of one frame and a control return signal afterward and transmitting it to the facsimile machine on the receiving side, it is possible to add a fill or make two telephone calls. It is possible to realize an inexpensive facsimile device that does not use a line and can shorten communication time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a facsimile apparatus according to the present invention, FIG. 2 is a timing chart of main signals of the apparatus shown in FIG. 1, and FIG. FIG. 4 is a block diagram of the conventional example; FIG. 6 is a signal sequence diagram of the device shown in FIG. 4; FIG. 6 is a frame configuration diagram of the device shown in FIG. 4. It is. 11...Reading device, 12...Encoding circuit, 13...
-Data transfer amount counter, 14...control command creation circuit. 16...Modem, 16...Line control circuit, 17...
・Control command analysis circuit, 18...control circuit, 19・
...RTC detection circuit, 2o...EOL detection circuit, 21
...And gate, 22...Data buffer, 23
. . . Data buffer unused amount detection circuit, 24 . . . Decoding circuit, 25 . . . Recording circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure 5

Claims (1)

[Claims] The facsimile machine on the receiving side includes a data buffer for storing received image information, a means for detecting an unused amount of the data buffer, and a transmitting side for transmitting the unused data of the data buffer detected by the detecting means for each frame. means for transmitting one frame of received image information to the data buffer by detecting the line end signal and the control return signal; means for detecting a line end signal; and means for detecting a control return signal; and a means of accumulating;
The facsimile machine on the sending side includes means for setting the amount of image information to be transmitted for one frame according to the unused amount data of the data buffer from the receiving side, and adding a line termination signal before the image information to be transmitted for one frame. A facsimile apparatus characterized in that it further comprises means for later adding a control return signal and transmitting it to a receiving facsimile apparatus for each frame.