KR920009333B1 - Off-hook alarming method - Google Patents

Abstract

The telephone having the hook-off automatically storing alarm function comprises a switching circuit (24), mwhich is connected between the output terminal of rectifier (12) and the speaking circuit (22), cutting-off the speech pass by responding to the input of the line restoration control signal; a hook-sensor (26), which is connected to the hook switch installed in the switching circuit, outputting the sensing signal according to the switching of hook-off; a microprocessor supplying the hold control signal to the melody transmitting circuit (16) by time counting the input of sensing signal of hook-off state outputted from the hook sensor and supplying the line restoration control signal to the switching circuit.

Description

Hook-off auto recovery alarm method and its phone

1 is a circuit diagram of a telephone according to the present invention.

2 is a flow chart according to the present invention.

* Explanation of symbols for the main parts of the drawings

12 bridge diode 14 ringer circuit

16: music transmitter 18: microprocessor

20: keypad 26: hook sensing unit

22: call circuit 28: amplifier

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone using a microprocessor, and more particularly, to a method for detecting and automatically returning to a hook-off caused by miss hook-on and alarming.

Currently, a telephone is a terminal device for transmitting and receiving a voice signal to a remote party through a communication line and is used as a communication means necessary for daily life.

In general, the current telephone is gradually developing into a multifunctional telephone having a dial memory and a microprocessor in order to dial one or two speed dial numbers of the other party, and its functions are being expanded.

However, as described above, the multi-function telephone or the general telephone recognizes only the operation according to the state of hook-on and hook-off by the user's actions, and operates only by the user's mistake. No action was taken to release and keep the hook-off state continuously.

Therefore, when the user puts the wrong handset, the incoming call from the outside could not be received for a long time, and the use of the exchange network was not efficient by occupying the exchange channel unnecessarily. That is, it has been the cause of increasing traffic of the exchange.

Accordingly, an object of the present invention is to detect a hook on / off state of a telephone in a telephone using a microprocessor and automatically hook-on by disconnecting a loop of talk current when the hook-off state is maintained for a predetermined time. A telephone is provided for transitioning an operation to a ring reception state.

Another object of the present invention is a telephone using a microprocessor, the hook-off state, when the hook-off state lasts for a predetermined time, the call-off loop is automatically recovered and the hook-off state alarming the miss hook-on state while automatically recovering the line state. It provides a recovery alarm method.

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

1 is a circuit diagram of a telephone according to the present invention, which is connected to a trunk line (T) (R) and bridges diodes for polarizing and outputting the trunk line voltage input through the line (T) (R). 12) and a ringer circuit 14 connected in parallel to the input terminal of the rectifier 12 and converting it into an audible signal when the ring arrives from the trunk line T; The speaker SP is connected to a power supply voltage Vcc of a predetermined level, and is driven by the input of a hold control signal to send music to the music output unit 16, and the hook sensing signal HKSS (Hook Sensing Signal). The input time is counted to provide a hold control signal (HOM) to the music transmitting circuit 16 at a predetermined time, and generates a line recovery control signal, and generates a dial signal according to a key input. Microprocessor (Frequency Code) or Pulsed Output r) (hereinafter referred to as MPU) 18 and the Kisken port of the MPU 18 to generate signals such as a call search key dial digit key, memory key, hook on / off, and the like. Connected to a keypad 20 provided to the MPU 18, a handset (not shown), and the MPU 18 to amplify and output an output signal of the handset and an MFC signal output from the MPU 18, A call circuit 22 which amplifies an input signal and outputs the received signal of the handset and a hook switch HS are built in and connected between the output terminal of the rectifier 12 and the call circuit 22. The hook switch Disconnecting / connecting the communication path of the rectifier 12 and the communication circuit 22 by the hook on / off of (HS), and switching the communication path by the line recovery signal output from the MPU 18 Connected to the channel switching circuit 24 and the hook switch HS of the channel switching circuit 24 And a hook sensing unit 26 for detecting a hook switching state of the hook switch and outputting a hook sensing signal (HKSS) to the MPU 18, the output terminal of the music transmitting unit 16, and the MPU (18). Amplification unit 28 which is connected between the beep tone output terminal of < RTI ID = 0.0 >) and the input terminal of the speaker SP < / RTI > It is composed of

At this time, the channel switch circuit 24 except for the hook switch HS corresponds to the channel switch means, and the configuration is configured as follows.

The first channel switching circuit 24 is connected between the first output terminal of the rectifier 12 and the first terminal of the communication circuit 22 to switch the first channel according to the first switching signal. Q1), the collector is connected to the first output terminal of the rectifier 12 via the hook switch (HS) and the emitter is connected to the second output terminal of the rectifier 12 and output from the MPU (18). And a second transistor Q2 which is switched by a line recovery signal input to the base to generate a second switching signal, the base of the first transistor Q1 and the second output terminal of the rectifier 12, The collector of the hook switch HS and the second transistor Q2 is connected to a base and responds to the switching of the hook switch HS and the second switching signal of the second transistor Q2 in response to the first transistor. A third transistor providing a first switching signal to Q1 It consists of (Q3).

The hook sensing unit 26 is composed of a transistor Q4 and a resistor R7-R6 which output a hook sensing signal in response to the hook-off of the hook switch HS. It consists of transistor Q5, capacitor C1, and resistors R8-R9.

The MPU 18 has an internal RAM (ROM) and a ROM (ROM) as a microprocessor for controlling a telephone, and has a built-in DTMF generator 21 for generating an MFC (Multi-Frequency Code). Japanese semiconductor maker HF 404608 from Hidaji and Oki's MSM 6352 can be used.

2 is a flow chart of the memory dial key processing according to the present invention, which is programmed in the MPU 18 and has the following procedure.

A hook state sensing process for searching whether the telephone line state is hook-off state, and a hook for searching whether the current state is kept in the hook-off state for a preset time at the hook off date and time as a result of the search in the hook state sensing process. When the off time detection process and the hook off time detection process determine that the hook off time has elapsed for a predetermined time, the hook control outputs a hold control signal to alarm the hook off and a line recovery control signal to block the call loop. The off alarm process takes place.

An operation example according to the present invention will now be described with reference to FIGS. 1 and 2.

When the operating power supply voltage Vcc is input to the telephone set as shown in FIG. 1 now, the MPU 18 reads the signal of the hook sensing terminal HKS in step 30 of FIG. 2 to search for hook-off. At this time, the search for the hook-off is a signal input to the hook sensing terminal (HKS). If the input signal is low, the hook-off; if the signal is high, the MPU 18 is hooked-on. The hook state is recognized.

Assuming that the initial telephone state is a hook-on state, the MPU 18 determines that the hook-off state is not in step 30 and processes the event to be hanged in step 32. For example, the kisscan of the keypad, the performance of the input key, and the like are performed, and the process returns to step 30 above.

When the telephone user picks up a handset (not shown) in the above operation state, the hook switch HS is switched from the hook-on HON to the hook-off HOF. At this time, the trunk line signal voltage that is aligned in the rectifier 12 and output to the first output terminal (+) is input to the base of the third transistor Q3 through the resistors R3, R4 and R5. The voltages of the two resistors R3 and R4 are input to the base of the transistor Q4.

The third transistor Q3 inputting the trunk line signal voltage is turned on to bypass the signal through the resistors R1-R2 through the collector-emitter, thereby turning on the first transistor Q1. Therefore, the channel between the rectifier 12 and the communication circuit 22 is formed by turning on the first transistor Q1.

Further, the series resistors R3 and R4 for inputting the trunk line signal voltage divide the voltage of the trunk line signal voltage and supply them to the base of the second transistor Q2, but the magnitude of the two resistors is R3 (4.7M) R4 (30K). ), The second transistor Q2 is maintained in a turn-off state.

Therefore, the trunk line signal output from the exchanger and input to the trunk line (T) (R), for example, a dial tone (ring tone) carried out before a DC of -48V level, is polarized by the rectifier 12 and then the first transistor. It is provided to the call circuit 22 via Q1. At this time, the call circuit 22 amplifies the input signal and outputs it to the speaker of the handset so that the user hears the dial tone.

On the other hand, when the communication path is formed, the transistor Q4 is turned on by the signal voltage input through the resistor R7. That is, the transistor Q4 which inputs the talk current, which is the trunk line signal voltage flowing through the hook switch HS, through the resistor R7 is switched on and the potential of the collector transitions from high to low. . In other words, the sensing signal of the hook-off is outputted as logic 'high'. Therefore, the hook sensing terminal HKS of the MPU 18 is turned low by the ON switching of the transistor R4 in the high state by the initial resistor R6. At this time, the MPU 18 determines that the current state is the hook-off state by the logic low signal input to the hook sensing terminal HKS in step 30.

In step 30, the MPU 18, which determines that the current state is the hook-off state, time-counts the input period of the hook-off sensing signal HKSS of the blow-off input to the hook-sensing terminal HKS. In step 34, it is searched whether the time counted value reaches a preset time LT.

At this time, the setting period should be set in the RAM area of the MPU 18 with a sufficient time considering the talk time. For example, it is desirable to set a time of at least 5 minutes in consideration of very long talk time.

As a result of the search of step 34, if the hook-off time has not passed the preset time, the MPU 18 jumps to step 32 to perform other services and repeats from step 30.

When the user presses a dial key installed in the keypad 20 in the above state, the data of the dial key is input to the kisscan port of the MPU 18. At this time, the MPU 18 sequentially writes to the internal DTMF generator 21 from the first digit of the dial digit input to the kisscan port in step 32, and performs other services after 30 steps.

On the other hand, the DTMF generator 21 built in the MPU 18 generates an MFC (DTMF) corresponding to the dial digit to be written and outputs it to the call circuit 22. The communication circuit 22 inputting the MFC signal outputted from the MPU 18 amplifies it and outputs it to the rectifier 12 through the first transistor Q1 and the ground path. At this time, the rectifier 12 transmits the input MFC signal to the exchange via the trunk line (T) (R). The exchanger (not shown) for inputting the MFC signal analyzes the input MFC signal and performs call processing according to the analyzed content, and performs a call with the interested party in such an operation.

Even in such a call state, the MPU 18 repeats the above 30 steps, 32 steps, and 34 steps to search for the duration of the hook-off state and the hook-off state.

When the call is terminated within the set time in the above operating state, that is, when the handset is placed and the hook switch HS is hooked on, both transistors Q2, Q3, Q1 and Q4 are turned off. When the transistors Q2, Q3, and Q1 are turned off, the communication path is cut off. When the transistor Q4 is turned off, the potential of the collector is pulled up to a level by the resistor R6. Transition to logic “high”. Therefore, when the handset is lowered and the hook switch HS is hooked on, the transistor Q4 is turned off and outputs the hook sensing signal HKSS to a logic high signal which is a hook-on detection signal.

At this time, the MPU 18 repeatedly performing the steps 30, 32, and 34 of FIG. 2 indicates that the call is terminated by the hook sensing signal HKSS of the logic “high” input to the hook sensing terminal HKS in step 30. Be aware. That is, when the hook sensing terminal (HKS) terminal is “high” before the set time, the call is terminated and the handset is immediately recognized and the service associated with the call is stopped.

If the user releases the handset incorrectly after the end of the call and the hook switch (HS) is still in the hook-off (HOF) position, the transistor Q4 turned on by the above-described operation continues to be turned on. In this case, the hook-off sensing signal in the blown state is output.

Therefore, the MPU 18 is determined to be in the hook-off state continuously in the process of FIG. 30 by the hook sensing signal HKSS output from the collector of the transistor Q4 and input to the hook sensing terminal HKS. do.

In step 30, the MPU 18, which determines that the current state is the hook-off state, counts the input period of the hook-off sensing signal HKSS0 of the low-frequency input to the hook-session terminal HKS as described above. In step 34, it is searched whether the time counted value has passed a predetermined time LT.

If the hook-off time due to the miss hook-on is continued and the time-counted hook-off time has passed the preset time LT, the MPU 18 controls the hold in step 36 of FIG. A hold control signal and a line recovery control signal in a logic high voltage state are output to the signal output terminal (HOM) and the pulse / hook flash terminal (P / HL).

At this time, the music transmitting circuit 16 is operated by the “high” hold control signal output from the hold control signal output terminal HOM of the MPU 18 to output music to the output terminal OUT. The music output from the music transmitting circuit 16 is input to the base of the transistor Q5, and the music input to the base of the transistor Q5 is amplified to a predetermined level so that the speaker (C1) of the collector (C1) of the collector ( SP) outputs an alarm for miss hook-on status.

On the other hand, the transistor Q2 is switched on by the line recovery control signal in a logic high state output from the pulse / hook flash terminal P / H.L of the MPU 18. When the transistor Q2 is switched on, the transistor Q3 is turned off by bypassing the voltage across the resistor R5 to ground through the collector tongue emitter of the transistor Q2.

When the transistor Q3 is turned off, the voltage at the base of the transistor Q1 is turned off by being raised by the voltage through the resistor R1, thereby blocking the communication path formed through the transistor Q1.

That is, when the transistor Q3 is turned off, even if the hook switch HS is connected to the position of the hook-off HOF, the transistor Q3 turns off by turning off the transistor Q1 forming the communication path. The current loop between the communication circuits 22 is interrupted so that the trunk line T is interrupted from the communication circuit 22.

Therefore, when the hook-off time due to the miss hook-on continues for more than the set time, the music delivery circuit 16 is driven to alarm the hook-off state and at the same time recover the call path.

In step 36 of FIG. 2, the MPU 18, which has performed music transmission and line blocking, reads the input logic state of the hook sensing signal HKSS input to the hook sensing terminal HKS in step 38 to check whether it is hooked on. Search.

At this time, when the user hears the alarm sound, the handset is put down and the hook switch HS is blocked by the hook-on, thereby turning off the transistor Q4. When the transistor Q4 is turned off, the potential of the collector is pulled up to a level by the resistor R6, and the MPU 18 receives the hook-on sensing signal HKSS in a logic high state. Output to hook sensing terminal (HKS) of.

The MPU 18 determines that it is hooked on by the hook-on sensing signal HKSS of the logic-high state inputted to the hook sensing terminal HKS in step 38 of FIG. 38, and the hold terminal HOM in 40. ) And the pulse / hook flash terminal (P / HL) output the low-low signal to interrupt music transmission, and simultaneously turn off the transistor Q4 to release the hook flash.

As a result of the search in step 38, if the 'hook-on' state is maintained, the MPU 18 searches in step 42 whether the memory key is input from the keypad 20. When the memory key is input from the keypad 20, the MPU 18 performs the above-described process (40) and transmits the memorized dial.

If the memory key is not input, the MPU 18 repeats the above-described process 38 to maintain the hook-on state by switching on the transistor Q2.

When a call is received from the outside during operation as described above, the ring signal is input to the ringer circuit 14 to operate the speaker SP to receive a call from the outside.

In addition, when the music output circuit is not used, the alarm sound is output through the beep output terminal (Beep) of the MPU 18, and the amplified alarm sound can be notified through the capacitor C5 by operating the transistor Q5 through the resistor R9. have.

If neither the music output circuit 16 nor the alarm sound are used, only the transistor Q2 is driven to allow a call from the outside to be received.

As described above, the present invention allows the user to receive a call from the outside by automatically interrupting the call while notifying the user by sending music or an alarm sound when the user puts down the handset after using the phone. The busy channel can be occupied to prevent the exchange from occupying the exchange, making the exchange's channel useful.

Claims (2)

Rectifier 12 connected to the trunk line T (R) to polarize the signals from the trunk line, and a ringer circuit connected in parallel to the input of the rectifier 12 to output a ring audible sound from the trunk line. 14 and a speaker SP, a music transmitter 16 connected to a predetermined power supply voltage and driven by an input of a hold control signal to output music, and a signal of the rectifier 12 to input a signal of a talk current. A hook-off self-recovery alarm telephone having a loop circuit and having a call circuit 22 for amplifying and outputting the input from the handset and amplifying the input from the rectifier 12 and outputting the signal to the handset. The hook switch HS is built in, and is connected between the output terminal of the rectifier 12 and the communication circuit 22. The hook switch HS is connected to the rectifier 12 in response to the hook on / off of the hook switch HS. Block / connect the call path of the call circuit 22, A call path switching circuit (24) for interrupting the call path in response to an input of a line recovery control signal; A hook sensing unit 26 connected to a hook switch HS in the communication path switching circuit 24 and outputting another sensing signal HKSS to switching hook on / off of the hook switch HS; Time-counting the input of the hook-off sensing signal HKSS output from the sensing unit 26 to provide the hold-hold control signal HOM to the music transmitting circuit 16 at a predetermined time and at the same time recovering the line. A microprocessor for supplying a control signal to the communication path switching circuit 24 and blocking output of the hold control signal HOM and a line recovery control signal in response to an input of a hook-on sensing signal HKSS. 18) Hook-off self-recovery alarm telephone characterized by consisting of. A hook-sensing means for detecting hook-on / off status of a telephone line and outputting a hook sensing signal and a hook-off automatic recovery alarm method for a telephone having a microprocessor. A hook state sensing process of searching for an off state, and the duration of the hook-off state exceeds a preset time at a hook-off state date and time at which the current state is found in the hook state sensing process; In the hook-off time detection process for searching whether the hook-off time is detected, and when the duration of the hook-off time exceeds the preset time in the hook-off time detection process, the hook-off state alarm sounds and at the same time, To block the call and detect whether the hook-on sensing signal is input. When it is determined that a signal is input, when the alarm signal is blocked and at the same time, the first call path recovery process for restoring the blocked call path and the hook-on sensing signal are not input during the call path recovery process. 2. A hook-off automatic recovery alarm method according to claim 1, wherein the second call path recovery process is performed to block the occurrence of the alarm sound in response to an input of a memory key and to restore the blocked call path.

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