JPS61203776A - Handshake method for facsimile system - Google Patents

Abstract

PURPOSE:To shorten the time necessary for the handshake procedures and to improve the efficiency of facsimile transmission by outgoing unilaterally a receiving instruction by a transmitter without awaiting a called-station identification signal transmitted by a receiver after the call is set. CONSTITUTION:The facsimile FX transmitter TX, in case when that the opposite FX receiver RX possesses a procesure contraction function is discriminated by a function storing means 14 and a function discriminating means 15, is loaded with a receiving instruction signal consisting of a non-standard equipment set signal NSS, a receiving station identification signal TSI, and a digital command signal DCS by a control signal storing means 5 when a clocking means 22 counts the lapse of one second after the setting of call by a line controlling means 5, and the transmitter TR transmits at the rate of 9,600b.p.s. The RX detects by its control signal detecting means 13 the receiving instruction signal before two seconds lapses after the call is enabled. When a control signal discriminating means 21 discriminates the detected command, the RX immediately reads from the means 19 an initial identification signal consisting of a non-standard equipment signal NSF, a called terminal identification signal CSI, and a reception ready signal MFCR as omitting 3sec of called station identification signal CED, and transmits it to the TX.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of handshaking between facsimile IJ transceivers.

In conventional facsimile machines, an operation called handshake is required between the transmitter and receiver before image signals are exchanged.

The handshake procedure defined in 30 is shown in FIG.
After the second elapses, the called station identification signal (CED) is emitted continuously with a duration of about 3 seconds, followed by the non-standard equipment signal (NSF).
It emits an initial identification signal of about 2 seconds consisting of a called terminal identification signal (C8I) and a digital identification signal (DIS). After detecting these signals, the transmitter (TX) emits a receive command signal of approximately 2 seconds including a non-standard equipment setting signal (NSS), a transmitting station identification signal (TSI) and a digital command signal (DC3), and then Approximately 1.5 seconds of training signal (T
After transmitting the CP), it waits for a reception readiness confirmation signal (CFR') of about 1 second from the receiver, and then starts transmitting the picture signal (PIX), that is, the message.

Problems to be Solved by the Invention As is clear from the above description, according to the conventional handshake procedure, it takes approximately 11.5 seconds to start transmitting an image signal after the call is established.

This can be said to be extremely inefficient at a time when image signal transmission time is gradually being shortened due to various improvements. The present invention focuses on this situation and aims to improve the efficiency of facsimile transmission by shortening the time required for the handshake procedure as much as possible.

Means for Solving the Problem The present invention provides that when automatic communication is performed between facsimile transmitters and receivers, after a call is set up, the transmitter unilaterally sends a reception command without waiting for a called station identification signal issued from a receiver. The receiver, upon receiving the instruction, omits the transmission of the identification signal and immediately issues an initial identification signal.

Operation The method of the present invention omits the called station identification signal from the handshake procedure, and furthermore, the transmitter issues a reception command before transmitting the identification signal, so the above procedure can be shortened.

Embodiment FIG. 7 is a block diagram showing the configuration of a facsimile machine implementing the present invention. (1) is a main control means consisting of a microcomputer, and (2) is an operation means including a keyboard device that gives instructions to the main control means (1) such as starting transmission, setting a mode, or specifying a receiver. . (3
) is a dial storage means that stores the dial number of the other party's facsimile machine, which has been entered in advance using the operation means (2). Similar to a known auto-dial device, the storage means stores a relatively large number of digits in correspondence with a short dial code of a few digits set from the operating means (2). The dial number "corresponding to the abbreviated dialing code specified by" is loaded into the auto-dial means (4), and the auto-dial means (4) outputs a pulse signal corresponding to the above-mentioned number to the line control means (5). Based on the pulse signal, a known line control means (5) including an NCU establishes a line connection with the designated facsimile machine via the telephone line (6), and
The control signal and image signal received via the modulation/demodulation means (
7). The modulation/demodulation means (7) is capable of receiving both 300 bps and 9600 bps signals.The image signal transmitted from the other party's facsimile is sent from the modulation/demodulation means (7) via the decoding means (8) to the recording means (9). ) from the reading means (11) to the encoding means (12).
), the image signal is supplied to the ZE demodulation means (7) and is transmitted from the line control means (5) to the other party's facsimile via the line (6).

The encoding means (11) and the decoding means (8) use a binary signal indicating white or black and a run length code or MH
It functions to mutually convert between the food and the food. Recording means (9)
The thermal head is driven by the signal supplied from the decoding means (8), and image information is printed on the recording paper. The reading means (12) scans a document prepared for transmission, converts the image information of the document into an electrical signal, and outputs it, and is capable of continuously reading a plurality of prepared documents. .

(13) is a control signal detection means for detecting a control signal from a signal supplied from the other party's facsimile machine and outputting it to the main control circuit (1). (14) is a function storage means, and among the speed dial codes of the other party's facsimiles registered in the dial storage means (3), only the code of the facsimile having the same no-and-shake procedure shortening function as this facsimile device is registered. has been done. The function storage means (1
4) is performed by the operator using the operating means (2). At the time of transmission, the function storage means (14) is searched for the speed dial code specified by the operation means (2), and the function determination means (15) determines the presence or absence of the dial code and sends the main control circuit ( 1) Output the determination result. (16) is a mode storage means, which stores communication modes that can be set by the operation means (2). The document detection means (17) is a sensor that detects whether or not a document exists in the reading means (12), and the next page detection means (18) is a sensor that detects whether or not a document exists in the reading means (12). This is a sensor that detects whether or not there is a document to be supplied. The control signal storage means (19) is a memory storing various control signals used for handshaking, the control signal determination means (21) is for determining the type of control signal detected by the control signal detection means (13), Timing means (
22) supplies a clock signal to the main control means (1).

Next, a handshake procedure by the above-mentioned facsimile machine will be explained.

First, we will explain the pre-message procedure from when a call is set up between the transmitter and receiver to the start of image signal communication.
b) (C), Fig. 5 [a], Fig. 6 (a), and Fig. 7 will be used to explain.

The facsimile transmitter (TX) is connected to the facsimile receiver (RX) of the other party designated by the operation means (2) by a dial storage means (3), an auto-dial means (4) and a line control means (5). However, at the same time, the function storing means (14) and the function determining means (15) determine whether or not the receiver (RX) has a procedure shortening function (step 2). The above shortening function can be applied to the receiver (R
)l, after the call is set up by the line control means (5) (step ■), the clock means (22) controls the control signal storage means (19) when one second has elapsed (step ■). Non-standard equipment setting signal (NSS), transmitting station identification signal (TSI) and digital command signal (DC3)
A reception command signal consisting of
) is emitted from the transmitter (TX) (step ■).

The above-mentioned reception command signal is made into an HDLC frame configuration defined by T, 30 by the main control circuit (1), and then sent out onto the line (6) via the modulation/demodulation means (7), but usually the above-mentioned reception command signal Add about 1 second preamble to 300
In this method, the preamble is a flag of about 10 bytes, and the reception command signal is sent out at 9600 bps, so that the sending time of the entire signal is about 1 second. The receiver (RX) detects the above reception command signal with the control signal detection means (13) before 2 seconds elapse after the call is established (step [phase]) (step [phase]), and discriminates it with the control signal discrimination means (21). If so (step [phase]), the called station identification signal (CED') is omitted and an initial identification signal, which will be described later, is immediately sent to the transmitter (TX). In addition, the receiver (R
For two seconds after the call is established, the modulation/demodulation means (
7) is switched to a high-speed modem, and the modulation/demodulation means (
7) When the above-mentioned reception command signal of 9600bl)S is normally received, the same training as when the training signal (TCP) is received by the command signal is performed. Furthermore, the receiver (RX) performs a frame check of the received command signal using the control signal determining means (21) (step [phase]), and if the command signal is normally received, a non-standard equipment signal (NSF) is detected. Called terminal identification signal (C3I)
and an initial identification signal consisting of a reception preparation confirmation signal (MFCRJ) (step [phase]). The initial identification signal at T, 30 includes a digital identification signal (DIS) indicating that the called device has CCITT functionality, but this is omitted in this method, and the initial identification signal (DIS) and the reception at T, 30 are omitted. Reference confirmation signal (
The reception readiness confirmation signal (MCF) described above also serves as the reception readiness confirmation signal (MCF).
R)' is substituted. These signals (NSF) (C3I
) (MFCR) is loaded from the control signal storage means (19), and is processed by the main control means (19) with a 10-byte abbreviated preamble added in the same way as the reception command signal.
, 3 seconds HDLC frame configuration.

The modulation/demodulation means (7) is switched to a low speed modem of 300 bps when the reception command signal is detected, and sends the initial identification signal to the transmitter (T)l at 300 bps. The modulation/demodulation means (7) of the transmitter (T)l is switched to a 300 bps low-speed modem after issuing a reception command signal, and the initial identification signal sent from the receiver (RX) is detected by the control signal detection means (13). When the reception readiness confirmation signal (MFCR) in the identification signal is detected by the control signal discriminating means (21) (step ■), the main control circuit (1) detects the reading means (12) and the encoding means (1).
1) to start transmitting the image signal (PIX) (step ■). After transmitting the initial identification signal, the receiver (RX) drives the recording means (9) and the decoding means (8) to start recording the image signal (PIX') (step [phase]).

If the receiver (RX) does not have the function of shortening the handshake procedure, the transmitter (TX) performs the function determination means (15) in step (3).
) Based on the output of T, 30 shown in FIG. The process moves to a handshake procedure by T, 30 (step [phase]).

In addition, in step [phase], the receiver (RX) determines that the shortened handshake is difficult if there is an error in the frame of the received reception command signal, and initializes the frame including the normal reception readiness confirmation signal (DIS). The process moves to a handshake procedure according to T, 30, which starts with the transmission of an identification signal (step [phase]). In this case, the transmitter (TX) detects the reception preparation confirmation signal (D I S ) in step ①, so the subsequent operation shifts to the handshake procedure at T, 30, which starts with sending the normal reception command signal. (step [phase]).

When the shortened handshake is successful, the image signal (
P1. X) The procedure after communication is shown in Figure 2 (a) (bl,
Figure 3 (a) (b), Figure 4 fa) (b), Figure 5 (b)
This will be explained next using FIG. 1, FIG. 6 fbl, and FIG. 7.

In the transmitter (TX), when the document detecting means (17) detects the end of the document in the reading means (12) (step ■), the main control circuit (1) detects the next page detecting means (18).
The output is read to detect whether there is a document to be read next (step ■). If the output of the next page detection means (18) indicates that there is no next page, the main control circuit (1) reads the procedure end signal (EOP') from the control signal storage means (19) and generates a 10-byte shortened preamble. Add about 0.35
second HE) LC frame 7 and sends it to the receiver (RX) (step ■). The receiver receives the above procedure end signal (EOP).
”) is detected (step [phase]), a message confirmation signal (MCF) is purchased from the control signal storage means (19),
The above shortened preamble is added and sent as a frame of about 0.35 seconds (step [phase]). Transmitter (TX)
When the above message confirmation signal (MCF) is confirmed (step @l), the disconnection command signal (DCN"l is sent out for about 0.35 seconds with a shortened preamble added),
Thereafter, the line control means (5) disconnects the line (6).

The receiver (RX) detects the disconnection command signal (DCN) (
After step o), the line (6) is disconnected and all facsimile communications are terminated.

If the next page detection means (18) indicates the presence of the next page in step (3) above, the transmitter (TX) operates the main control circuit (
1) reads the contents of the mode storage means (16) and detects whether or not the mode has been changed (step 2).

If the mode has not been changed, the transmitter (TX) receives the multi-page signal (MPS) from the control signal storage means (19).
is read out, the above-mentioned shortened preamble is added, and the signal is sent to the receiver (RX) for about 0.35 seconds (step [phase])
. When the receiver (RX) receives the multi-page signal (MPS) (step O), it sends out a message confirmation signal (MCF) with an abbreviated preamble added for about 0.35 seconds (step [phase]). The transmitter (TX) detected the message confirmation signal (MCF) (step [phase])
After that, return to step ① and input the image signal (PIX) of the next original.
The receiver (RX) returns to step [phase] and receives the image signal (PIX) of the original document.

In addition, if the contents of the mode storage means (16) have been changed in the above-mentioned step (3), the transmitter (TX) receives a message end signal (EOM
) is read out, a shortened preamble is added, and the signal is transmitted for 0.5 seconds (step 0). When the receiver (R)l detects the end-of-message signal (EOM) (step [phase]), it reads the message confirmation signal (MCF) from the control signal storage means (19), adds a shortened preamble, and reads out the message confirmation signal (MCF) from the control signal storage means (19). Deliver for 35 seconds (step [phase]). When the transmitter (TX) detects the message confirmation signal (MCF) mentioned above (step [phase]
), immediately create the same reception command signal that was sent in step ① and emit it for 1.3 seconds (step [phase]), and further send out the training signal (TCP) for 1.5 seconds (
step [phase]). After receiving the reception command signal and training signal (TCP) (step [phase] [phase]), the receiver (RX) issues a reception readiness confirmation signal (CFR) with a shortened preamble for about 0.35 seconds. step [phase]),
Return to step [phase]. After the transmitter (TX) detects the reception readiness confirmation signal (CFR) (step 0), it returns to step (■) and transmits the image signal (PIX) of the next original,
Image signal communication in a new mode is started between the transmitter/receiver (TX) (RX).

According to the present handshake procedure described above, the time required from the call establishment to the start of image signal communication is T shown in FIG. 1(a),
30 steps takes about 11.5 seconds (fb)
As shown in Figure 3, the time can be reduced to approximately 3.3 seconds. Furthermore, if the shortened handshake is difficult, the time will be approximately 8.5 seconds as shown in FIG. In addition, in this procedure, the preamble transmission period in the HDLC frame is set to approximately 0.3 seconds, so the transmission time of each control signal is shortened, and as a result, the time required from the end of image signal communication until the line is disconnected is as shown in Figure 2 (a). Compared to approximately 3 seconds for the T, 30 procedure shown in FIG. 3, the time is reduced to approximately 1.05 seconds as shown in FIG. Similarly, the time required for the procedure to send multiple originals continuously is
While the T,30 procedure shown in Figure 3(a) takes approximately 2 seconds, this procedure shortens it to approximately 0.7 seconds as shown in Figure 3(b), and furthermore, the transmission mode. In the case of continuous transmission with changes, the approximately 8 seconds from the sending of the message confirmation signal (MCF) by the receiver to the sending of the reception command signal by the transmitter is omitted, so the time between image signals is )
While the T,30 procedure shown in FIG. 3 required about 14.5 seconds, this procedure shortens the time to about 3.85 seconds, as shown in FIG.

In addition, in this handshake procedure, a receiver that is not registered in the function storage means (14) at the time of starting communication is T,
Although the handshake is carried out according to the procedure specified in Section 30, there may be cases where a receiver that is not registered in the storage means (14) has the function of this abbreviated handshake. Therefore, in this case, a flag indicating that abbreviated handshake is possible is provided in the non-standard equipment signal (NSF) emitted from the receiver using the T,30 procedure, and when the transmitter detects this flag, the abbreviated dial of the receiver is set. The code can be automatically registered in the function storage means (14).

Effects of the Invention According to the present invention, the time required for handshaking between facsimile transmitters and receivers can be reduced, and facsimile I
In addition to improving the utilization efficiency of the J device, it is also possible to reduce line usage charges.

[Brief explanation of drawings]

FIGS. 1(a), fb, and (C) are time charts showing the handshake procedure after call setup until the start of image communication, respectively. (C1 shows the procedure when the method of the present invention is difficult to apply. Figure 2 fat (b)
are time charts showing the handshake procedure from the end of image signal communication until the line is disconnected, and (a) in the figure shows T':
Figure 3 (a) (bl is a time chart showing the handshake procedure when a plurality of originals are continuously communicated in the same mode). , the same figure (al is T, the procedure according to 30, the same figure (b) shows the procedure according to the present invention. Fig. 4 Ta) fb) shows the handshake when multiple originals are continuously communicated in different modes. In the time chart showing the procedure, [1 (a) shows the procedure according to T, 30, and the same figure (b) shows the procedure according to the present invention. FIG. 5(a) is a flowchart for explaining the handshake procedure according to the present invention.
6(b) shows the procedure of the transmitter, and FIGS. 6(a) and 6(b) show the procedure of the receiver. FIG. 7 is a block diagram showing an example of a facsimile machine that implements the method of the present invention.

Claims (1)

[Claims] After the call is established, waits for the station identification signal from the receiver. Sends a reception command signal from the transmitter without After receiving the reception command signal, the receiver transmits the station identification signal. Omit the code and immediately send the initial identification signal. A facsimile machine characterized by being designed to Handshake method in Ri.