KR100202402B1 - Direct calling method for facsimile - Google Patents

Abstract

In order to make a call between facsimile machines, dialing or a separate ring generator must be used to send a ring signal, and the time required for this is improved. To this end, the calling fax sends a direct call tone called fax having a preset tone period in response to a direct call key input for calling another fax, and then responds to receiving a call response signal from the called fax. Transmit mode. In addition, the called side facsimile transmits a call response signal to the calling side facsimile in response to receiving a direct call tone from the calling side facsimile and performs a reception mode. The exchange detects the tone period of the direct call tone input from the caller's facsimile, confirms that the called party's facsimile is called from the examined tone period, and then connects the call path between the calling and the called facsimile. Therefore, it is possible to directly call a relative fax without sending a dialing or ring signal.

Description

Direct call of facsimile

1 is a block diagram of an embodiment of a direct call facsimile system according to the present invention.

2 is a block diagram of a facsimile of FIG.

3 is a flow chart of a direct call during transmission in a fax in accordance with the present invention.

4 is a flow chart of a direct call on receipt at a fax in accordance with the present invention.

5 is a block diagram of another embodiment of a direct call facsimile system according to the present invention.

6 is a block diagram of an exchange in FIG.

7 is a flow chart of a direct call in an exchange in accordance with the present invention.

8 is a tone period timing diagram of a direct call tone of the present invention.

The present invention relates to a method of calling a facsimile, and more particularly, to a method of directly calling a relative facsimile without transmitting a dialing or ring signal.

In general, facsimile communication is through separate leased lines or through exchanges in public switched networks.

First, facsimile communication through the exchange occurs as follows. First, when the calling party hooks off as a telephone and dials the called party's subscriber number, the exchange recognizes the subscriber's number according to the dialing and rings the called party when the called party is not busy. Send the. The called party detects the hook signal and hooks it off, and the exchange connects the call path between the calling party and the called party. In this state, when the called party is set to the automatic receiving mode, the called party transmits the call response signal to the calling party through the exchange and then performs the receiving mode, and the calling party performs the transmitting mode in response to receiving the call response signal. . The call response signal here refers to the called station indentification (CED) as specified in CCITT Recommendation VII T.30. The transmission mode and the reception mode refer to a general operation mode in which the fax transmits and receives image information about an original.

As above, in order to make a call between facsimile machines, dialing must be done in advance, and the exchange must send a ring signal to the called party.

Also, in case of facsimile communication using separate leased line, it does not go through exchange but only needs to send ring signal to called party by using separate ring generator.

As described above, in order to make a call between facsimile machines, it is necessary to dial through an exchange or transmit a ring signal using a separate ring generator, as well as additional time required for dialing and ring signal transmission. There was a problem.

Accordingly, an object of the present invention is to provide a direct call method capable of directly calling a relative fax without transmitting a dialing or ring signal.

Another object of the present invention is to provide a direct call method that can be called using a preset tone signal between facsimile connected to each other through a dedicated line.

It is another object of the present invention to provide a direct call method that can be called using a preset tone signal between a plurality of facsimile connected to a subscriber line of an exchange.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

First, the block configuration of an embodiment of a direct call facsimile system according to the present invention is shown in FIG. 1 shows direct calls between facsimile machines 100 and 102 connected to each other through a dedicated line. Referring now to FIG. 1, if the facsimile 100 attempts to call the called party's called party's called party's facsimile, a ring signal is transmitted to the called party's side. To send). In this case, the direct call tone refers to a tone signal of a predetermined frequency having a preset tone period. The called side facsimile 10 then recognizes that there is a call in response to receiving the direct call tone and transmits a call response signal to the calling side facsimile 100. Thereafter, normal facsimile communication is performed between the calling side facsimile 100 and the called side facsimile 102.

Therefore, a separate ring generator can be used to make calls between facsimiles without sending ring signals.

FIG. 2 is a block diagram of the facsimile 100 and 102 of FIG. 1 and shows a block diagram of a general facsimile. In FIG. 2, the CPU 200 generally controls the facsimile according to a set program. The memory unit 202 stores an operation program and a general control program of the central processing unit 200 according to the flowcharts of FIGS. 3 and 4 for carrying out the present invention as described below. Store data according to program execution. The OPE (operating pannel) 204 has a plurality of keys and applies key data according to the pressing of the keys to the central processing unit 200 and displays the operating state of the system by the display data of the central processing unit 200. The scanner 206 scans an original, converts an image of the original into binary information, and applies the same to the central processing unit 200. The modem 208 demodulates the input / output signal of the central processing unit 200. The network control unit (NCU) 210 forms a call path between the call line and the modem 208 under the control of the central processing unit 200. The printing unit 212 prints the information output from the central processing unit 200. The sensor unit 214 detects the state of the document and the recording sheet and informs the CPU 200. 2 is a configuration of a general facsimile, so detailed description of the operation will be omitted.

3 is a flow chart of a direct call when transmitting from a facsimile according to the present invention, and transmits to a direct-call tone called side facsimile having a preset tone period in response to a direct call key input for calling another facsimile from one facsimile. After that, it shows that the transmission mode is performed in response to receiving the call response signal from the called-side fax.

4 is a flow chart of a direct call process upon reception in a facsimile according to the present invention, which shows that the receiver performs a receive mode after transmitting a call response signal to the call side facsimile in response to receiving a direct call tone from the call side facsimile. .

Hereinafter, the operation of an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4.

In FIG. 1, assuming that the facsimile 100 calls the other party's facsimile 102, the facsimile 100 becomes the calling party and the facsimile 102 becomes the called party.

First, when the user of the calling side facsimile 100 inputs a direct call key provided on the OPE 204 of the facsimile 100 to call the called side facsimile 102, the central processing unit 200 (300). It detects this in step and performs step 302. Here, the direct call key can be set by combining a key on the OPE 204. For example, suppose you press the '*' key and then the start key. In step 302, the NCU 210 controls the line to form a call loop, and then, in step 304, a preset direct call tone is generated through the modem 208 to make the called side facsimile 102. In step 306, it is checked whether a call response signal is received from the called party's facsimile 102. In this case, it is a known general technique to generate a tone signal having a certain frequency and a specific tone period in the modem 208.

At this time, the called side facsimile 102 detects the direct call tone received through the NCU 210 and informs the central processing unit 200 of the modem 208. Then, the central processing unit 200 recognizes that there is a call in response to the direct call tone being received at 400, and controls the NCU 210 to form a call loop by controlling the NCU 210 at step 402. In step 404, the call response signal is generated through the modem 208 and transmitted to the call side facsimile 100, and in step 406, the normal reception mode is performed.

The central processing unit 200 of the call side facsimile 100 then performs the normal transmission mode in step 308 in response to receiving the call response signal in step 306.

Thereafter, normal facsimile communication is performed between the calling side facsimile 100 and the called side facsimile 102.

Therefore, a separate ring generator can be used to make calls between facsimiles without sending ring signals. On the other hand, the present invention can be called using a direct call tone not only between the facsimile connected to each other via a dedicated line, but also between a plurality of facsimile connected to the subscriber line of each exchange. This will be described in more detail.

First, the block configuration of another embodiment of the direct call facsimile system according to the present invention is shown in FIG. In FIG. 5 a number of facsimile machines 502-506 are connected to each subscriber line of the exchange 500. Referring now to FIG. 5, when any one of a plurality of facsimile 502-506 wishes to call the other party's facsimile, a preset direct call tone is generated and transmitted to the exchange 500. In this case, the direct call tone has a different tone period corresponding to each facsimile to be called, unlike in the facsimile connected to the above-mentioned dedicated line. Then, the exchange 500 detects the tone period of the received direct call tone, detects the detected tone period, recognizes the called side facsimile from the detected tone period, and connects the call path between the calling side fax and the called side facsimile. . Accordingly, a direct call tone generated at the calling party's facsimile is transmitted to the called party's facsimile. The called party fax then detects that a direct call tone is input and recognizes that there is a call, and sends a call response signal to the calling fax. Thereafter, normal facsimile communication is performed between the calling and called faxes.

This allows you to make calls between facsimiles without having to dial.

FIG. 6 shows the block diagram of the exchanger in FIG. In FIG. 6, the central processing unit 600 controls call switching and controls each part of the exchange to provide various services to the user. The memory unit 602 is an operation program of the central processing unit 600 according to the flowchart of FIG. 7 for carrying out the present invention as described below, and a program of the central processing unit 600 for performing general call processing and various functions. And initial service data and temporarily store initial data of the central processing unit 600. The switching circuit 604 switches various tones and voice data under the control of the central processing unit 600. The subscriber circuit 606 supplies a call current to the subscriber under the control of the central processing unit 600 and simultaneously interfaces a signal between the subscriber and the switching circuit 604. The tone supplier 608 generates various tone signals under the control of the central processing unit 600 and outputs them to the switching circuit 604. The tone detector 610 is connected to the switching circuit 604 detects the tone signal generated from the subscriber and applies a signal corresponding to the tone period to the central processing unit 600. The dual tone multi frequency (DTMF) receiver 612 is connected to the switching circuit 604 and analyzes the MFC (Multi Frequency Code) signal generated from the subscriber and applies the digit data to the central processing unit 600. The DTMF transmitter 614 generates an MFC signal under the control of the central processing unit 600 and applies it to the switching circuit 604.

7 is a flow chart of a direct call in the exchange according to the present invention, after detecting the tone period of the direct call tone received from the calling side facsimile and confirming that the called side fax is called from the detected tone period. It shows the connection of the call path between called faxes.

FIG. 8 is a tone period timing diagram of the direct call tone of the present invention, which shows that the tone periods of the direct call tone are set differently as shown in FIGS. 8A to 8C in response to each called side. In FIG. 8, TON represents tone on time in one tone period and TOFF represents tone off time in one tone period.

Hereinafter, the operation of another embodiment of the present invention will be described in detail.

First, the block structure of the facsimile 502-506 is the same as that of FIG. 2 of the above-described embodiment, and the flow chart of the direct call when transmitting / receiving in the facsimile is the same as the above-mentioned FIGS. In FIG. 2, the NCU 210 is connected to a dedicated line, but here, the NCU 210 is connected to a subscriber line of the switch 500.

In FIG. 5, assuming that the facsimile 502 calls the other party's facsimile 506, the facsimile 502 becomes the calling party and the facsimile 506 becomes the called party.

When the direct call key provided on the OPE 204 of the caller's facsimile 502 is input in the above state, the CPU detects this in step 300 and performs step 302. In step 302, the NCU 210 is controlled to scavenge the line to form a call loop, and then in step 304, the tone period corresponds to every facsimile 504-506 as shown in FIG. The call response signal is received from the called side facsimile 506 in step 306 while generating a direct calling tone corresponding to the called side facsimile 506 among the differently set direct calling tones and transmitting it to the exchange 500. Check it.

At this time, the central processing unit 600 of the exchange 500 detects as a tone detector 610 that a direct call tone is received from the call side facsimile 502 as described above in step 700 and detects in step 702. It is confirmed that the called side facsimile 506 is called from the received tone period, and in step 704, the switching circuit 604 is controlled to connect the call path between the calling side facsimile 502 and the called side facsimile 506. .

Accordingly, the direct call tone generated at the calling side facsimile 502 is transmitted via the exchange 500 to the called side facsimile 506.

Then, the called side facsimile 502 detects the direct call tone received through the NCU 210 in the modem 208 and informs the CPU 200. Then, the central processing unit 200 recognizes that there is a call in response to receiving the direct call tone in step 400 and controls the NCU 210 to form a call loop by controlling the NCU 210 in step 402. In step 404, the normal reception mode is performed.

At this time, the call response signal transmitted from the called side facsimile 506 is transmitted to the calling side facsimile 502 through the exchange 500.

The central processing unit 200 of the calling side facsimile 502 then performs the normal transmission mode in step 308 in response to receiving the call response signal in step 306.

Thereafter, normal facsimile communication is performed between the calling side facsimile 502 and the called side facsimile 506.

When the communication between the calling side facsimile 502 and the called side facsimile 506 is terminated in the above state, the central processing unit 600 of the exchange 500 controls the switching circuit 604 to recover the communication path. .

Therefore, even among multiple facsimile machines connected to the subscriber line of the exchange, it is possible to call each other without additional dialing.

Meanwhile, in the above description, the present invention is applied to communication between facsimile machines. However, the present invention may be applied to a direct call without the need for a separate dialing in a communication terminal device such as a telephone.

As described above, the present invention has the advantage that it is possible to directly call the other fax machine without transmitting a dialing or ring signal.

Claims (1)

In a direct call method through the exchange between a plurality of facsimile connected to the subscriber line of each exchange, each facsimile corresponding to each facsimile in response to a direct call key reception for calling another facsimile from one of the plurality of facsimile. Generating a direct called tone specifying a called side facsimile among the directly called tones having a preset tone period differently from each other and transmitting to the exchange, the tone of the direct called tone received from the calling side facsimile at the exchange; Detecting a period and confirming a called side facsimile called by the calling facsimile from the detected tone period, and then connecting a call path between the calling side facsimile and the called side facsimile; and at the called side facsimile, the exchange The direct call from the caller's fax via And performing a transmission mode in response to receiving the call response signal from the called party facsimile at the calling party facsimile through the exchange in response to the tone being received. How to call.