JPH01311738A - Memory reception system for facsimile equipment - Google Patents

Abstract

PURPOSE:To obtain a reception recording picture without transmission error by adopting the constitution so that the retransmission of input picture information is requested to a sender side if the said picture information is at the outside of a discrimination area of a reception data point of a high speed data reception MODEM. CONSTITUTION:The input picture information is stored in a picture information storage section MEM via a network control section NCU and a demodulation section DEM. If a high speed MODEM reception data point is at the outside of the discrimination area during the reception of the picture information, it is informed to a transmission control section TC through a signal transfer path 9. The transmission control section TC counts number of times of the reception data point at the outside of the discrimination area during the reception of one page. The transmission control section TC returns a retrain negative signal RTN to request the retransmission in the page or the reduction transmission speed to the transmission terminal equipment when the said count is larger than the specified value.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a memory receiving system for a facsimile machine.
In particular, the present invention relates to a memory reception method for a facsimile machine that reproduces, receives and records image information stored in a memory from a high-speed data reception modem.

[Conventional technology]

Conventionally, the memory reception method of this type of facsimile machine was
Because the reception method used was to directly transfer demodulated image information to memory and store it without managing transmission errors,
A transmission error is detected for the first time when the stored image information is decoded after being received in the memory, and the image information is transferred to the recording unit without any means of recovering from the transmission error, and the recorded surface containing the transmission error is output. Was.

[Problem to be solved by the invention]

The memory reception method of the conventional facsimile machine mentioned above is
The system was to store image information in the memory, which is the image information N product means, and then terminate the communication without detecting a transmission error, so after the communication was completed, the image information stored in the memory was transferred to the memory There is a drawback in that when outputting to a computer, the intelligibility of the received recording surface is significantly reduced due to transmission errors.

[Means to solve the problem]

The memory reception method of the facsimile apparatus of the present invention includes means for outputting an error signal when input image information is out of the reception data point determination area of the high-speed data reception modem;
means for requesting the sending side to reconsider the image information or sending an I lane denial signal when the number of outputs of the error signal exceeds a preset value while multiplying the image information of the page by N; have.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, and FIGS. 2 and 3 are arrangement diagrams of received data points and timing diagrams for explaining the operation of this embodiment.

The present embodiment shown in FIG. 1 includes a network control unit NCU, a demodulation unit DEM, a page end code detection unit RTC, an image information storage unit MEM, a decoding unit DEC, a recording unit RFC, a transmission control unit TC, a normal reception unit, and a memory. It is configured with interlocking switches SWI and SW2 that switch the receiving image information transfer path.

On the other hand, 1 is a line input signal, 2 is a demodulation unit input signal, 3 is a demodulation unit power signal, 4 is an image information transfer path for normal reception, 5 is a decoding unit input signal, 6 is an iTh unit input signal, and 7 is a Image information transfer path during memory reception; 8 is image information transfer path for recording after memory reception; 9 is information transfer from the demodulation unit to the transmission control unit where the position of the high-speed modem reception data point is outside the determination area path.

Reference numeral 10 indicates recording paper presence/absence information, 11 indicates switching signals of SWI and SW2, 12 indicates negative termination information, and 13 indicates control lines between the transmission control section and each unit 1.

Figure 2 shows CCITT in a high-speed data receiving modem.
4800bps reception in 27er mode (indicates the received data point at 8 o'clock, P,,P,.

P2. ......The 8 points of P7 indicate the ideal position of data point 1~ when there is no disturbance in the transmission path, and Po'
indicates the position when the ideal data point position of Po shifts due to disturbance in the transmission path.

Also, the symbols AO, A l, A2, ...A7
The circular area indicates the determination area of the received data point in this embodiment, and each area is set in a circular shape with a radius p1H.

As an example, to explain the data point Po, the actual data bond position P that has been affected by a disturbance in the transmission path. ′ exists within the judgment area, and counts the number of times it falls outside the judgment area for each page of image information, and only if this value is greater than a preset value, sends a message to the sending terminal. In response, a signal urging negative retransmission or a reduction in transmission speed is sent back.

Specifically, a transmission control unit TC that centrally controls the entire device is connected to the modem via a bus, and is capable of recognizing the positions of data points of the high-speed data receiving modem. The distance ρ0 between the two is easily recognized.On the other hand, since the threshold value ρ↑, 1 of the determination area is set as a fixed value in advance, only the number of times when 1.&0>, RtH is satisfied is counted.

In Fig. 3, S is a transmitting terminal, R is a receiving terminal, and CED
is the called station identification signal, NSF, C3l-DIS is the digital identification signal, TSI/NSS is the digital command signal, T
CP is a training check signal, CFR is a reception readiness confirmation signal, and PIXI.

PIX2 is image information, MPS is multi-page signal, RTN
is a retrain denial signal, EOP is a procedure end signal, MC
F indicates a message confirmation signal, and DCN indicates a line disconnection command signal9.Furthermore, the timing at which the t-avoid operator loads the reception recording paper into the receiver and prints out the image information stored in the memory, T, , T2. indicates the time during which one page of image information is being received.

Next, the operation of this embodiment will be explained. Image information PIX
One page of I has been received, or many transmission errors have occurred, and the sending terminal is requested to retransmit the negative data or to reduce the transmission speed.
By sending back the lane negation signal RTN and, as a result, lowering the transmission speed from 4800 bps to 2400 bps, and transmitting the image information PIX2 of the second page,
The following pages show cases in which received images without transmission errors are obtained.

In FIG. 2, image information when performing a memory reception operation is stored in a network control unit NCU, a demodulation unit DEM, and an image information storage unit 2 M.
However, if the high-speed modem reception data point is outside the determination area shown in FIG. 2 during image information reception, the transmission controller TC is notified via the signal transfer path 9, At TC, one page is being received (T in Figure 3).
1), the number of times the received data point deviates from the determination area is counted. On the other hand, to detect the end of one page,
Specified by CCITT's T4 recommendation. Procedure end signal EO
A section for detecting P is connected in parallel with the image information storage section MEM, and when the RTC detection section detects a page end code, it is immediately notified to the transmission control section TC by a page end signal 12.

The transmission control unit TC immediately determines whether the count value of the number of times a received data point deviates from the determination area during one page reception is larger or smaller than a specified value, and if it is determined to be larger than the specified value, the transmission control unit TC retransmits the page or A retrain denial signal RTN is sent back to request the transmitting terminal to reduce the transmission rate. As a result, the sending terminal transmits the image information PIX2 on the second page at 4800 bps.
The transmission speed is reduced from 2400bps to 2400bps. As a result, the S/N is improved by lowering the transmission speed, and during reception of the second page (period T2 in Figure 3), the received data point does not fall out of the judgment area and there is no transmission error. In this state, the image information is transferred to the storage unit MEM and stored.

After this, the operator on the receiving terminal side
t,", the information in the image information storage unit MEM is passed through the decoding unit (DEC) and the recording unit (REC), and from the second page onwards, a good recording unit without any transmission errors is obtained. In response to the retrain signal RTN returned at the end of reception of a page, the transmitter not only reduces the transmission speed from the next page, but also detects a good received image from the first page when retransmitting the image information of the first page. is obtained.

〔Effect of the invention〕

As explained above, the present invention includes means for recognizing the position of a data point in a receiving modem, means for counting the number of times the data point deviates from a determination area in a transmission control unit, and furthermore, at the end of reception of one page. If the count value is larger than the specified value, a retrain denial signal is sent back to the transmitter to request page retransmission or to reduce the transmission speed. This has the effect that the reception recording section can be reproduced from the image information storage section.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIGS. 2 and 3 are arrangement diagrams of received data points and timing diagrams for explaining the operation of this embodiment. N CU...Network control unit, DEM...Demodulation unit, RTC
...Terminal code detection section, MEM... Image information storage section, D
EC: decoding section, REC: recording section, TC: transmission control section.

Claims (1)

[Claims] means for outputting an error signal when input image information is out of the determination area of the reception data point of the high-speed data reception modem; and a predetermined value for the number of times the error signal is output while one page of the image information is being accumulated. 1. A memory receiving system for a facsimile apparatus, comprising means for transmitting a retrain negation signal requesting a transmitting side to retransmit the image information when the image information exceeds the image information.