JPS60112370A - System for receiving facsimile signal whose redundancy is suppressed - Google Patents

Abstract

PURPOSE:To attain Omsec reception by a small memory by checking memory use condition each completion of communication for one document, performing consecutive Omsec reception when there is free space in memory and by repeating wait action when there is no free space. CONSTITUTION:A modulation signal from a net controller 4 turns into binary no filler data 1 by a demodulator 5 and is stored in a memory 6. A memory control circuit 9 is always detecting free area in the memory. When the circuit 9 detects that free area in the memory can not receive data for one document, it commands a flag transmission circuit 10 to send out a flag, then the circuit 10 keeps transferring flags until there is free space found in the memory after detecting a mulit-page signal, holding the progress of procedure on the transmission side, and in the meantime, the circuit 9 performs recording processing and does not send out message confirmation field until it finds any free space in the memory. When memory storage quantity drops less than area limit value, the circuit 9 performs reception of data again.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a facsimile signal reception system in which redundancy is suppressed.

Many facsimile machines require a certain amount of time to scan (read and record) one scanning line due to various mechanical and electrical constraints. This is called the minimum transmission time, and for normal facsimile, it is 5°10, 20. 40mi13
Seconds are common. That is, in order to guarantee these times, a code called filler is added so that when l scanning lines of information are sent, the time is not shorter than the minimum transmission time. Can you remove this filler and only have one scanning line of information? The transmission time for sending is set to zero milliseconds (hereinafter referred to as O).
It is abbreviated as @Sec, and this communication is called 0yytSeC communication.

In FIG. 1, the read data (a) is encoded by M) I or MR and the redundancy is suppressed to become (b). When this is sent through a modulation circuit (modem), the scanning time for one scanning line can be calculated by dividing the number of pits after encoding by the transmission speed of the modem. In (C), 1 is information for l scanning lines, 2 is a filler, and the combination of 1 and 2 guarantees a minimum transmission time of 3.

Conventionally, when performing 0i88C communication, large-capacity memories were prepared on both the transmitting side and the receiving side, and data transfer between the memories was performed regardless of reading and recording. For this reason, the receiving side also required a large capacity memory on the same scale as the transmitting side, and the disadvantage was that the memory could not be used for other purposes at the same time.

The present invention prevents memory overflow in the communication procedure in Q@sec communication, effectively uses limited memory capacity by simultaneously recording and receiving, and performs Q@sec reception with a small memory. The purpose is to realize the following.

According to the present invention, the present invention includes a memory having a capacity exceeding a certain specified value, a circuit for monitoring the usage status of the memory, and a circuit for continuously sending out a flag in a control procedure, and the usage status of the memory can be determined by one communication. It checks each time it is completed, and if the next one can be received, it sends a control signal, and if it cannot, it sends a flag continuously, stops the other party's progress, and waits for the memory to become free. A reception method for Fakunmi'J signals with suppressed redundancy, which is a characteristic feature, can be obtained.

In other words, in QmSec reception, the present invention provides MA and MI when receiving and recording are performed at the same time.
Based on the theory that 5KB is approximately 3QKB in B4 size, each time a message is received, it is checked whether the current memory usage state can secure the above number of bytes. If the above number of bytes can be secured, the receiving side immediately sends 1 MCF (Message Confirmation Field) in response to MPS (Multi Page Signal),
Receive data for the next manuscript. If the MCF cannot be secured, the sending side is kept waiting by continuously sending a flag to send the MCF to the MPS, and during that time, the data in the memory is output to the recorder, and when the area of the above number of bytes becomes free, the MCF is sent. Send out. In this way, if there is space in the memory, QmSec reception is performed continuously, and if there is no space, the waiting operation is repeated, and it is possible to effectively use the limited memory capacity and realize QtrL86C reception. That is.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a block diagram of an embodiment of the present invention, in which a modulated signal received through a network control unit 4 is stored in a memory 6 in a demodulator 5 as binary data 1 without filler. The memory 6 is constantly monitored by the memory control circuit 9.
The memory control circuit 9 always detects the remaining memory area. 7 is a decoder, and the data 1 read from the memory 6 is decoded by the decoder 7 and outputted to the recorder 11 by the recording circuit 8.

When the memory control circuit 9 detects that the remaining memory cannot receive data for the next one message, it detects the flag (1) and continuously transmits the flag until the memory becomes free and fills the message/confirmation field ( (hereinafter abbreviated as MCF) is not transmitted.

FIG. 3 shows the progress of the transmission control procedure and the storage KA state of the memory. In (a), 12 is the transmitting side, 13 is the receiving side, and (b) the memory storage amount 21 increases depending on the data 14 sent from the transmitting side. After one communication is completed,
When the MPS 15 is received from the transmitting side, the receiving side 13 sends out the MCF 16 because the recording operation is still continuing but there is more than one space left in the memory. By repeating this operation, when the free area of the memory after communication and reception exceeds the limit value of 20 in (b) and approaches 22 (lt114°memory overflow 19), the receiving side will output lag after MPS15 detection. The sending circuit 10 sends the signal 17, stops the procedure on the sending side, and during that time performs decoding and recording processing, and does not send out the MCF until the remaining space in the memory becomes 20 lines or less. After disconnecting, data 14 is received again.

By controlling the memory and the transmission procedure in this way, it is possible to receive OrrLSeC with a relatively small memory.

In another embodiment of the present invention, when the memory is used for other purposes, the remaining area is detected and QrrL
It is considered and possible to perform Sec reception. That is, free memory areas can be effectively utilized depending on the memory usage status.

As explained above, the present invention has the advantage that Q@Sec reception can be realized with a limited memory capacity.

[Brief explanation of drawings]

Fig. 1 (a), (b), and (C) show a facsimile machine 4 with reduced redundancy: a network control section, a demodulation circuit,
6...Memory, 7...Decoder, 8...
...Recording circuit, 9...Memory control circuit, 1
0... Flag sending circuit, 11... Recorder. Atsushi / Figure z 3 Figure

Claims (1)

[Claims] It has a memory with a capacity greater than a certain specified value, a circuit that monitors the usage status of the memory, and a circuit that continuously sends out flags in the control procedure, and the usage status of the memory is checked every time one communication is completed. If the next message can be received, it sends a control signal, and if it cannot, it sends a flag repeatedly, stops the other party's procedure, and waits for the memory to become free. A facsimile signal reception method that suppresses redundancy.