KR930010278B1 - Dial digit storable & back-up method - Google Patents

Abstract

This method specially concerns a dial digit storage keeping device that will memorize phone numbers in hook-on state and store back-up data without using batteries. The method provides a dial digit storable phone system that will store dial digits and store data for a long period without battery use through a micro processor. This system comprises a rectifier, a communication circuit, a communication control circuit, a micro processor, and a back-up power supply. This method is composed of a key input checking routine, a dial storage routine and a communication loop blocking routine.

Description

How to keep the dial digits stored on the telephone

1 is a dial digit storeable telephone apparatus according to the present invention.

2 is a flowchart of operation of the dial digit storeable telephone apparatus according to the present invention.

The present invention relates to a control method of a telephone apparatus capable of storing dial digits. The present invention relates to a method of controlling a telephone number for speed dialing in a hook-on state without using a battery. The present invention relates to a method for storing and storing dial digits of a telephone apparatus.

BACKGROUND With the recent development of telephony, telephones having a speed dialing mode have emerged. A telephone having a speed dialing mode can be classified into two types. First, a memory area is set inside the dialer chip itself to store digits by a user and output stored data as dial digits. All. Second, a microprocessor (hereinafter referred to as MPU) is used to store and output dial digits. Products using the MPU as described above uses a dedicated MPU for the phone, for example, an MPU incorporating a pulse generator and a DTME generator. Such MPUs include HD404608 and the like.

However, telephone devices using the dial digit storeable dialer chip and the MPU for the telephone as described above must store the battery in order to store the dial digit in the internal memory area and back up the dial digit stored in the memory area. I had. The battery is used as a power supply for backing up the operating power of the dialer or the MPU and the data of the internal memory.

Therefore, in the conventional dial digit storeable telephone apparatus, without the first battery, the telephone number cannot be recorded in the internal area as a speed dial, and the second recorded dial digit data cannot be backed up.

It is therefore an object of the present invention to provide a dial digit storeable telephone apparatus using a microprocessor for storing dial digits without batteries and storing the stored data for a long time.

Another object of the present invention is to provide a control method of a telephone apparatus capable of storing and storing dial digits in a hook-on state when a handset is lowered without a battery.

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 terminal (T) (R), and rectifier 12 for polarizing and outputting the trunk line voltage from the trunk line terminal (T) (R); A voice signal connected to the call loop first and second lines 20 and 22 and operated by a DC current through the call loop first and second lines 20 and 22 and superimposed on the DC current. And a phone call circuit 24 for outputting a voice signal superimposed on the DC current and a hook switch HS, and having a positive and negative voltage output lines 14 and 16 of the rectifier 12 embedded therein. It is connected between the loop first and second lines 20 and 22, and is switched by the switching operation of the hook switch HS to output the output signals of the positive and negative output lines 14 and 16 to the call loop. The call control circuit 18 connected to the first and second lines 20 and 22, the power supply terminal VDD, the tone output terminal Tone, the pulse output terminal Pulse, and the mute signal The call loop first line 20 has an output terminal M and a key signal input terminal K, and is operated by a power supply voltage input to the power terminal VDD to receive a dial signal corresponding to an input key signal. The MPU 32, the choke coil 26, the diode 27, and the capacitor 30 are stored in the internal memory when the memory key, the location key, and the dial number are inputted. It is connected in series between the first line 20 and the second power source GND to filter and rectify the positive voltage inputted to the first loop 20 of the call loop, so that only the DC voltage is the power terminal of the MPU 32. A positive voltage through the constant output line 14 connected between an operating voltage output circuit provided to a VDD and a constant output force line 14 of the rectifier 12 and an output terminal of the operating voltage output circuit. Memory power supply means for providing a memory power supply of the MPU 32 by current limiting a voltage; The diode 36 is configured to provide a signal of the pulse output terminal Pulse of the MPU 32 in one direction as a control signal of the call control circuit 18.

In the above-described configuration, the call control circuit 18 includes an emitter of the first transistor Q1 connected between the emitter-base resistor R1 between the constant output line 14 and the call loop first line 20. And a collector are connected, and the collector-emitter of the resistor R2 and the second transistor Q2 is connected between the base of the first transistor Q1 and the ground, and the base of the second transistor Q2 and the resistor ( The hook switch HS and the resistor R3 are connected between R1).

In addition, the MPU 32 has a memory area capable of storing a dial digit, and when the location key and the dial signal are input in the memory mode, the MPU 32 stores the dial signal in the locator key storage area. In the normal mode, the dial signal in the locator storage area is read out. The MPU 32 also incorporates a DTMF signal generator and a pulse generator to output DTMF and pulse signals corresponding to input keys according to mode selection. Such MPU 32 is currently produced and sold in one-chip.

Reference numeral 38 denotes a keypad (key pad) having den keys (0, 1, 2, ..., 0), #, * keys, memory keys, and the like.

FIG. 2 is a flowchart illustrating an operation according to the present invention, which forms a DC loop of a trunk line voltage in an on-hook state when a memory key is input, and inputs and stores a digit.

Hereinafter, an operation example of FIG. 1 according to the present invention will be described in detail.

When the trunk line voltage output from the exchanger is input to the trunk line terminal T (R), the rectifier 12 polarizes the trunk line voltage input to the trunk line terminal T (R) to correct the rectified voltage. Output to sub output lines 14 and 16 is performed. The positive voltage output to the rectifier output line 14 of the rectifier 12 becomes a power supply voltage of a predetermined level through a resistor 34 which is a current limiting resistor, and then the power supply voltage terminal VDD of the MPU 32. Is applied. When the user picks up the hand cell (not shown) and hooks off in the above state, the hook switch HS is turned on. At this time, a positive (+) voltage output to the rectifier output line 14 of the rectifier 12 is input to the base of the second transistor Q2 through the resistor R1, the hook switch HS, and the resistor R3.

Accordingly, the second transistor Q2 is turned on by the forward bias between the base and the emitter through the resistor R3, and thus, the first transistor having the base connected to the collector of the second transistor Q2 is turned on. Q1) is also turned on. By the turn-on of the first transistor Q1, the output of the constant output line 14 of the rectifier 12 is input to the call circuit 24 through the call loop first line 20 and at the same time the choke coil 26 ) Is entered. The call circuit 24 is supplied from a positive voltage of the call loop first line 20 and a second call line 22 connected to the negative output line 16 of the rectifier 12. It is operated by a negative voltage and forms a current loop of DC voltage flowing in the first and second lines 20 and 22 of the communication loop. The communication circuit 34 forming the current loop of the DC voltage as described above reproduces an AC signal inputted by overlapping the voltage of the first communication line 20 and outputs the signal to a speaker (not shown), and outputs a microphone (not shown). AC voice signal inputted from the control unit is superimposed on the transmission current of the DC current loop and output to the first loop 20 of the call loop. At this time, the signal of the call loop first line 20 is output to the trunk line terminal T (R) through the current loop of the rectifier 12.

On the other hand, the choke coil 26 that inputs the positive voltage from the second loop 20 of the call loop performs low pass filtering to output only the DC voltage to the anode of the diode 27, and the diode 27 outputs the input voltage. It rectifies and outputs it with the operating power supply voltage of MPU32. The capacitor 30 connected to the cathode of the diode 27 is a capacitor for noise reduction and power supply safety. Therefore, when the user hooks on and switches the hook switch HS on and off, the call loop of the call circuit 24 is formed, and operation power is supplied to the MPU 32.

When the dial key signal is input from the keypad 38 in the above state, the MPU 32 analyzes the number of the input dial key signal and generates a dial signal DTMF corresponding to the analyzed number to make a call loop. Output to the first line 20. The dial signal on the call loop first line 20 is superimposed on the loop current and output to the trunk line terminal T through the rectifier 12. The dial signal transmitted to the trunk line terminal T (R) is transmitted to an exchange (not shown), and the call is started when the subscriber corresponding to the transmitted dial signal responds.

On the other hand, when the subscriber pushes the memory key on the keypad 38 to store the telephone number of a specific called subscriber as a speed dial in the storage area in the MPU 32 in the hook-on state where the hand cell is lowered, It is input to the MPU 32. At this time, the MPU 38 performing the operation as shown in FIG. 2 determines that the memory key is input in step 50 of FIG. 50, and sets the operation mode to the write mode in step 52 and to the pulse terminal and the mute terminal M. Outputs the logic high signal. That is, the MPU 32 outputs the call loop formation control signal in response to the input of the memory key. The 'high' signal output from the pulse terminal Pluse of the MPU 38 is input to the base of the second transistor Q2 through the diode 36 connected forward.

Therefore, since the second transistor Q2 is turned on by the output of the pulse output terminal Pulse of the MPU 32, the first transistor Q1 is turned on as described above. The communication circuit 24, which inputs the mute signal " high ", mutes the handset sensitivity. On the other hand, by the turn-on of the first transistor Q1, the output of the rectifier 12 passes through the constant output line 14 and the emitter-collector of the first transistor Q1. Is supplied.

The call loop of the call circuit 24 is formed by supplying the voltage of the call loop first line 20, and the voltage by the choke coil 26 and the diode 27 is applied to the power supply terminal VDD of the MPU 32. Is input. That is, after the trunk line voltage is filtered, it is rectified by the diode 27 and input to the power supply voltage of the MPU 32. In the above state, when the user presses a ten key located on the external keypad 38 and inputs a location key signal which is a shortcut number, this is performed by the MPU 32.

Is input to the key signal input terminal.

At this time, the MPU 32, which has input the key signal, searches whether the input key signal is the memory key in FIG. If it is determined in step 54 that the search result is not the memory key, the MPU 32 searches whether the input key signal is a location key in step 56. At this time, if it is determined that the input key signal is a location key, the MPU 32 selects a storage area of the internal memory corresponding to the location key in step 58.

On the other hand, as described above, when the user who inputs the location key using the key of the keypad inputs the telephone number of the called subscriber to be stored in the MPU 32 by pressing the key of the keypad, the MPU 32 enters the input. The telephone number is stored in the storage area designated by the locator key input in FIG. 58 and jumped to step 54 to search whether the memory key is input.

Then, if another locator key and another phone number are input in the same process as described above, the MPU 32 continues to store the phone number input in the designated area of the locator key.

Therefore, even when the hand cell is lowered in the hook-on state (the hook switch in FIG. 1 is turned off), the telephone number can be stored as a speed dial number (location number) using the memory key and the ten key of the keypad 38.

After storing a plurality of telephone numbers as a speed dial number by the above operation, when the user presses the memory key of the keypad 38 again, it is input to the MPU 32. At this time, the MPU 32 searching whether the memory key is input in step 254 determines that the memory key is input, releases the memory mode, and sets the operation mode to the normal operation mode.

Then, the "high level" signal output to the pulse output terminal (pulse) and the mute terminal (M) is a low. Accordingly, the second transistor Q2 is turned off by the output of the pulse output terminal pulse. The first transistor Q1 is also turned off by the " turn off " of the second transistor Q2.

Therefore, the supply voltage from the choke coil 26 and the diode 27 is cut off to the power supply voltage terminal VDD of the MPU 32, and the resistor 34 connected to the constant output line 14 of the rectifier 12. Only a current of voltage through) is applied.

At this time, the voltage through the resistor 34 is input to the storage holding voltage of the memory in the MPU 32, so that the telephone number stored in the MPU 32 is maintained as it is.

In general, since the power required to maintain the telephone number stored in the memory area is a few microamperes, only a current of voltage through the resistor 34 is sufficient. For example, the resistor 34 is 2M If it is set to, the output voltage of the rectifier 12 is 48 Volt, and 2.4 μA current is applied to the power supply in the MPU 32, and thus, the power supply for maintaining the telephone number stored in the MPU 32 is sufficient.

As described above, the present invention provides a telephone using an MPU capable of storing speed dials, and connects one terminal of the MPU to a call control circuit and switches the trunk line in the on-hook mode according to the input state of the Melori key. A speed dial without battery is formed by forming a trunk line loop, applying a trunk line voltage to the operating voltage of the MPU, and storing a speed dial. The functionality can be implemented.

Claims (1)

Rectifier 12 that polarizes the voltage output from the trunk line terminal, and is operated by the input of the talk current, and detects and reproduces a signal superimposed on the talk current, and sends a voice signal superimposed on the talk current. A communication line connected between the circuit 24 and the rectifier 12 and the communication circuit 24 and supplying the polarity-aligned communication current to the communication circuit 24 by input of a communication loop formation control signal. It has a control circuit 18, a power input terminal and a call control signal output terminal, and supplies a call loop formation control signal to the call control circuit 18 in response to a predetermined key input, and inputs a memory and a location key. In response to the microprocessor, which stores the speed dial number in an internal memory, is connected between the rectifier 12 and the power input terminal of the microprocessor to supply backup power. A dial digit storing and holding method of a telephone apparatus having a backup power supply means, comprising: outputting the call loop forming control signal in response to an input of a memory key to form a call loop and searching for input of a key And a speed dial storing process of storing an input dial digit in a storage area of a locator corresponding to a key that is currently input in the key input searching process and performing the key input searching process; And a call loop blocking process for blocking output of the call loop forming control signal when it is determined that a key currently input is a memory key in an input search process.