KR930006824B1 - Automatic alternative control method for fax - Google Patents

Abstract

In a facsimile an automatic switchover control method includes a colling tone detecting process in which transmits back tone and detects calling tone in a designated switchover time (T1), a hook state detecting process, a telephone connecting process, and a facsimile connecting process. In the hook state detecting process, if the hook is off state the line is connected with the telephone, or if the hook is on state the line is connected with the facsimile after the switchover time (T1) if tone flag is not set.

Description

Facsimile automatic transfer control method

1 is a block diagram of a conventional facsimile.

2 is a conventional switching control flowchart.

3 is a block diagram of a facsimile machine according to the present invention.

4 is a switching control flowchart according to the present invention.

5 is a waveform diagram of a ringback tone and a ring tone signal.

6 is a subroutine flow chart for pseudo ringback tone transmission and collington detection according to the present invention.

* Explanation of symbols for main parts of the drawings

10: modem 20: analog switch

30: Transformer 40: CPU

50: input and output interface unit 60: ring detection unit

89, 90: first-first hook state detection unit K1-K6: relay

R1: resistance

The present invention relates to an automatic switching control method in a facsimile, and more particularly, to an automatic switching control method for automatically detecting whether a counterpart is a fax or a telephone when receiving and automatically switching to a line or a facsimile.

In general, a facsimile machine has a built-in telephone to transmit and receive image data or to make a voice call by telephone.

1 is a diagram of a conventional facsimile block, in which a common terminal COM is connected to a tip terminal T of a telephone line, a normal close terminal NC is connected to a telephone connection terminal 101, A common terminal COM is connected to a relay K1 having a normal open terminal NO, driven by a first relay driving signal, and a ring terminal R of a telephone line, It has a cross terminal (NC) and a normal open terminal (NO), to the relay (K2) interlocked with the relay (K1) by the first relay drive signal, and to the normal open terminal (NO) of the relay (K1) The common terminal COM is connected, has a normal closed terminal NC and a normal open terminal NO, a relay K3 driven by a second relay drive signal, and a normal open terminal of the relay K3 ( NO) and the normal open terminal NO of the relay K2, and are driven by a third relay drive signal to generate a dial pulse. The coil L1 is connected between the relay K4 sent out to the line, the connection terminal 102 of the telephone and the normal closed terminal NC of the relay K2, and the switch SW on the power supply voltage Vcc side. ) Is connected to one end, and the first hook state detection unit 80 outputs a first hook state detection signal by turning on the switch SW by the magnetization of the coil L1 at the time of hook-off. ) Is connected between the connection terminal 101 of the telephone and the normal-close terminal NC of the relay K2, and is connected between the power supply voltage Vcc side and the ground to the tip and ring terminal of the telephone line. A ring detector 60 for detecting a ring signal input through T and R, a modem 10 for demodulating and demodulating input and output signals through the receiving terminal RX and the transmitting terminal TX, and a switching control signal. An analog switch 20 connected to a transmission terminal Tx or a reception terminal RX of the modem 10 and a normal crawl of the relay K3. An impedance matching transformer 30 connected between the terminal NC and the analog switch 20, a CPU (Central Processing Unit) 40 for controlling the system as a whole, and the relay (K1, K2, K3, K4), ring detection unit 60, analog switch 20, CPU 40, first hook state detection unit 80, respectively, and under the control of the CPU 40 And an input / output interface unit 50 for outputting a first to third relay driving signal and a switching control signal, and outputting the first hook state detection signal and the ring detection signal to the CPU 40.

2 is a flow chart of a conventional transfer control.

Referring to FIG. 1 and FIG. 2, the operation of automatically switching the conventional telephone or facsimile mode is as follows.

When the power is "on" now, the CPU 40 of FIG. 1 detects whether a ring signal is detected in step (A1) of FIG. 2, wherein the ring signal is transmitted from the counterpart through the tip and ring terminals (T, R). When input, the ring detection unit 60 detects a ring signal and applies it to the CPU 40 through the input / output interface unit 50. Then, the CPU 40 proceeds to step (A2) and determines whether the mode currently set is a manual reception mode. If the manual reception mode is used, the CPU 40 drives a bell driver (not shown) in step (A3). Ring the bell and proceed to step (A4). If the hookoff is not performed by searching whether the hookoff is performed in the step (A4), it is checked whether the first set time T1 is reached in the (A5) step. In this case, the first setting time T1 is a time set to limit the time during which the user picks up the handset from when the ringer sounds. If the first set time T1 has not been reached in step (A5), the operation loops to step (A3) to repeat the above-described steps.

However, when the user lifts the handset and hooks it off within the first set time T1 in step (A4), the coil L1 is magnetized by the current flowing through the coil L1 of the first hook state detection unit 80. The switch SW is "on".

Therefore, a "high" signal, which is a first hook state detection signal, is input to the CPU 40 through the input / output interface unit 50, and the CPU 40 detects that the hook is off and proceeds to step (A6). When the user makes a call in step (A6), if the user does not receive the fax after completing the call, the hook state detection signal by the first hook state detection unit 80 is input as "low" and thus detects the call. Hang up. However, if the user wants to receive the fax after completing the call, the document receiving key operation is performed, and the CPU 40 outputs the first relay driving signal to drive the relays K1 and K2 through the input / output interface 50. . As a result, the relays K1 and K2 connect the common terminal COM to the normal open terminal NO. The CPU 40 outputs a switching control signal so that the analog switch 20 is connected to the transmission terminal TX of the modem 10. Accordingly, the facsimile is operated, and the FAX reception ready signal is transmitted to the other party through the tip and ring terminals T and R. At this time, when the other party hears the fax reception ready signal and operates the document transmission start key, the analog switch 20 is connected to the receiving terminal RX of the modem 10 by a switching control signal to receive the document. . In this case, the fax signal is a signal defined by the CCITT and means a signal of "Press the transmit key to send a document". As described above, when the call is terminated or the document reception is completed in step (A6), the process proceeds to step (A7).

On the other hand, if the mode currently set in step (A2) is not the manual reception mode is determined to be in the automatic reception mode, proceeds to step (A9) to proceed to step (A10) after a predetermined time delay. At this time, in step (A9), a predetermined time delay is required to set up the modem 10 and detect the next ring signal in preparation for receiving the document.

If it is detected in step (A10) that the ring signal is detected, and if it is not detected, the process proceeds to step (A11) and checks whether the second set time T2 is reached. At this time, if the second set time (T2) has not reached, looping to step (A10) continues to search for ring signal detection, and the second set time (T2) limits the time for searching for detection of a ring signal. It is time to set.

When the ring signal is detected in step (A10), that is, when the ring detection signal is input from the ring detection unit 60, the process proceeds to step (A12) to output the first relay driving signal to relay (K1, K2). Drive. Therefore, in the relays K1 and K2, since the common terminal COM is connected to the normal open terminal NO, the circuit configuration is changed. That is, it is transferred from the line to the facsimile. Then, in step (A13), the (CPU) 40 outputs a switch control signal so that the analog switch 20 is connected to the transmission terminal TX of the modem 10 so that the facsimile is operated (A14). Proceed to step to send a fax reception ready signal to the other party through the tip, ring terminals (T, R).

When the other party hears the fax reception ready signal and operates the document transmission start key, in step (A14), the CPU 40 outputs a switching control signal so that the analog switch 20 receives the receiving terminal of the modem 10 ( RX) to receive the document. When the reception of the document starts, in step (A16), the CPU 40 checks whether the reception is finished, and if not, loops to the step (A15), repeats the above-described steps, and when the reception is completed, proceeds to step (A7). . In step (A7), the analog switch 20 is returned to its original position, and in step (A8), the relays K1 and K2 are returned to their original positions.

As described above, the conventional method transmits a fax signal irrespective of whether the other party wants a telephone call in the automatic receiving mode, and hooks on and off even if the user picks up the handset to make a call after the circuit is switched to the fax. There was a problem that could not be detected.

Accordingly, an object of the present invention is to send a pseudo ringback tone within a set time for performing an automatic transfer function in a facsimile with a built-in telephone, and automatically detect whether the other party is a facsimile or a telephone according to whether a calling ring is detected. In addition, the present invention provides an automatic switching control method capable of detecting the state of a hook switch even when switched to a facsimile.

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

3 is a block diagram of a facsimile according to the present invention, which includes a modem 10, an analog switch 20, a transformer 30, a CPU 40, a relay K1-K4, and a resistor ( R1), the ring detection unit 60, and the first hook state detection unit 80 are the same as those in FIG.

The common terminal COM is connected to the telephone connection terminal 101, the relay K5 having a normal close terminal NC and a normal open terminal NO, and driven by the fourth relay driving signal, and a common terminal. (COM) is connected to the telephone connection terminal 102 and has a normal close (NC) and a normal open terminal (NO), the relay (K6) and the power supply interlocked with the relay (K5) by the fourth relay drive signal, Hook off of the hook switch (not shown) in the automatic switching mode by being connected between the voltage Vcc and the ground and connected between the negative power supply voltage terminal V _EE and the normal open terminal NO of the relay K6. A second hook state detection unit 80 that detects a state and outputs a second hook state detection signal, the relay K1-K6, a ring detection unit 60, and a first-second hook state detection unit 80; 90, the analog switch 20, and the CPU 40 are connected to the first to fourth relay drive signals and switches under the control of the CPU 40. The output referred to the control signal, and may enter the ring detection signal and the first-second off-hook detection signal is input and output interface unit 50 is configured to add the output to the CPU (40).

In the above configuration, the first to second hook state detection units 80 and 90 are photocouplers and high sensitivity relays. It can be implemented by other detection means.

FIG. 4 is a flow chart of a switching control according to the present invention, which detects a ringtone and transmits a pseudo ringback tone within an automatic transfer time T1 set to perform an automatic transfer function when detecting a ring signal. Hook state detection process that detects hook on / off state after detecting calling tone in tone detection process, and if hook off state is detected during hook state detection process, connect line to telephone to make telephone call Press to receive a fax and receive a fax after the set automatic transfer time (T1) has elapsed when the tone detection flag is not set by searching for a tone detection flag when the hook state is detected in the hook state detection process. This is done by fax connection process.

5 is a waveform diagram of a ringback tone and a collington signal. FIG. 5a is a shape of a pseudo ringback tone signal and FIG. 5b is a waveform diagram of a collington signal.

The ringback tone signal as shown in FIG. 5 (5a) is a 6-second cycle (a North American standard and a 3-second cycle in Korea), and the ringback tone is transmitted for 2 seconds (1 second in Korea) and 4 seconds (2 seconds in Korea). The liver is a signal having a pause period, which is the same as a ringback tone signal having a period of tone transmission period t1 and a pause period t2, and transmits only a frequency of the tone transmission period slightly differently so that the other party senses it as a ringback tone signal.

In addition, the Collington signal as shown in FIG. 5 (5b) transmits a Collington signal of 1100 Hz _± 38 Hz for 0.5 seconds at a period of 3.5 seconds, and sends Collington again with a 3 second rest period. This means that the fax is in transmission and ready for transmission.

FIG. 6 is a subroutine flow chart for pseudo ringback tone transmission and collington detection according to the present invention, and is composed of FIGS. 6a and b.

A tone sending process for generating an alarm task to sound an alarm and selecting a tone sending mode to send a pseudo ringback tone, and after transmitting a pseudo ringback tone in the tone sending process, enter a receiving mode and set a call tone check timer. It is composed of a collington detection process for detecting a collington by detecting a received signal, and an alarm elimination process for setting a tone detection flag and removing an alarm task after detecting a collington in the collington detection process.

Based on the above-described configuration, an embodiment of the present invention will be described in detail with reference to FIGS.

The CPU 40 now checks whether the ring signal is detected from the ring detection unit 60 in step 4a, and proceeds to step 4b when the ring signal is detected. In step (4b), the CPU 40 checks whether the automatic switching mode is performed, performs a normal fax function if the automatic switching mode is not, and proceeds to step 4c if the automatic switching mode is used. Proceed to step (4). In the step (4c), the first relay driving signal and the fourth relay driving signal are generated to connect the common terminal COM and the normal open terminal NO of the relays K1 and K2 and the relays K5 and K6. In step (4d), the timer for performing the automatic switching function is determined as the first set time T1 of about 10-30 seconds, and then step (4e) is performed. In step 4e, the CPU 40 connects the analog switch 20 to the receiving end RX of the modem 10 to enter a receiving state, and proceeds to step 4f. In the step (4f), the pseudo ringback tone transmission and the collington detection routine are performed. The pseudo ringback tone is transmitted as shown in FIG. 5 (5a), and at least for 4 seconds (or 2 seconds) during the pseudo ringback tone rest period. Calling tones such as FIG. 5B are detected for 50 msec. Here, the operation of the subroutine for transmitting the pseudo ringback tone and the calling tone detection in the step (4f) is shown in FIG. 6 and generates an alarm task in step (6a) to generate an alarm, that is, ringtone, and proceeds to step (6b). do. In step (6b), the CPU 40 clears the tone detection flag and proceeds to step (6c). In step 6c, the CPU 40 connects the analog switch 20 to the transmitting end TX of the modem 10 and proceeds to step 6d. In step (6d), the tone sending timer corresponding to FIG. 5 (a) t1 for setting the tone sending period is selected and step (e) is performed. In step (6f), the pseudo ringback tone is transmitted as shown in FIG. 5 (a), and the process proceeds to step (6f). In step (6f), it is checked whether the pseudo ringback tone transmission time has elapsed, such as t1 in FIG. 5 (a). If the pseudo ringback tone transmission time has not elapsed, the process returns to step (6e) and continues to transmit pseudo ringback tone. If the pseudo ringback tone delivery time has elapsed, perform step (6g).

In step (6g), the analog switch 20 is connected to the receiving end RX of the modem 20, and step (6h) is performed. In step (6h), a Calling Tone test timer is set for a preset time as shown in FIG. 5 (5b) t2, and step (6i) is performed. In step (6i), the collington check counter is set to five. In this case, 5 is a minimum time value for detecting a collington and may be set larger. After setting the Collington Check Counter in step (6i), in step (6i), the received signal is examined during the period t2, which is a pause period of the pseudo ringback tone transmission signal of FIG. 5 (a) every 10 msec. Perform. In the step (6K), if a collington (1100 Hz) as shown in FIG. 5 (5b) of the received signal is detected, if the collington is not detected, perform step (6p), and if the collington is detected, step (6l) Perform In step (6p), it is determined whether the set time of the collington test time has elapsed. If the set time has elapsed, step (6o) is performed. If not, the process returns to step (6i) again.

In step (6l), the set value of the collington check counter is counted down by 1 each time the collington is detected, and the process proceeds to step (6m). In step (6m), it is checked whether the Collington check counter value is "0", and if it is "0", step (6n) is performed. If it is not "0", step (6j) is performed again. In step (6n), at least five successive times of detection of the collington are detected, and then the tone detection flag is set. In step (6o), the alarm task is removed to remove the ringtone and return.

Then, in step 4g, the second hook state detection signal is read from the second hook state detection unit 90, the hook state of the telephone is checked, and if the hook-off state is performed, step (4h) is performed. If the hook is not on, perform the step (4k). In step (4h), the tone detector flag is cleared and step (4i) is performed. In step (4i), if the user does not receive the document after the telephone call is terminated by the call, or if the user presses the fax receiving key after receiving the document, the CPU 40 switches the analog switch. Connect 20 to the receiving terminal RX of the modem 10 to receive the fax.

In the step (4k), if the tone detection flag is set when the colling tone as shown in FIG. 5 (5b) is detected, and the tone detection flag is set, perform the step (4m), and the tone detection flag is not set. If yes, perform step (4l). In the step (4l), it is checked whether the first set time (T1) has been reached, and if the first set time (T1) is reached, the step (4m) is performed, and if the first set time (T1) is not reached again ( Perform step 4f). In step (4m), the CPU 40 connects the analog switch 20 to the receiving end RX of the modem 10 to perform fax reception.

As described above, when the voice answering service is not available in the built-in facsimile machine, when the receiving operation is performed, the other party can automatically detect whether the fax is a facsimile or a telephone and transfer the fax to receive or make a voice call. There is an advantage that can be detected.

Claims (2)

In the automatic switching control method in which the receiving side of the fax detects the telephone mode or the fax mode status of the transmitting side and automatically switches, the pseudo ringback tone is set within the set automatic switching time (T1) for performing the automatic switching function when detecting the ring signal. Collington detection process for transmitting and detecting Collington, hook state detection process for detecting hook on / off state after detecting Collington in the Collington detection process, and hook off state detection in the hook state detection process If the line is connected to a telephone line to make a telephone call and hang up or press a key to receive a fax, and if the hook state is detected in the hook state detection process, the tone detection flag is searched and the tone detection flag is not set. Automatic transfer control method characterized in that the process of the fax connection to receive the fax after the set automatic transfer time (T1) elapsed. The method of claim 1, wherein the detecting the calling ring comprises: a transmission mode selection step of selecting a transmission mode after generating an alarm task, ringing a bell, clearing the tone detection flag, and selecting a transmission mode in the transmission mode selection step; Set a tone sending timer to send a pseudo ringback tone, and transmit a pseudo ringback tone in the tone sending process, enter a receiving mode, set a call tone check timer, and check the received signal for the set time. And an alarm removing step of detecting a collington and a alarm removing step of setting a tone detection flag and removing an alarm task after detecting the collington in the collington detection process.