KR20010027429A - Portable RF Paging System and Method thereof - Google Patents

Abstract

PURPOSE: A portable wireless calling system is provided to wirelessly transmit various messages of parents to wireless paging receivers of children, or to search positions of the children, so as to alarm the parents through a wireless paging device, when the children is out of a range set by the wireless paging device. CONSTITUTION: A paging device(100) comprises as follows. The first distance signal generator compares an RSSI(Received Signal Strength Indicator) signal with a multi-step fundamental value, and generates a distance signal. The first signal processor(130) controls communication with a paging receiver(200), and finds a distance corresponding to a receiver position by the distance signal, then decides whether the receiver(200) is out of a set range to generate an alarm signal. The first display(150) displays a distance where the receiver(200) is located, and displays a message code corresponding to a functional key for being transmitted to the receiver(200). The first RF transceiver(110) converts an inputted paging signal from the first signal processor(130) into a modulated transmission signal, and demodulates a received RF propagation signal to apply binary digital data to the first signal processor(130), then supplies the RSSI signal to the distance signal generator. An alarming unit informs parents that the receiver(200) is out of the set range. The receiver(200) comprises as follows. The second signal processor(230) analyzes a message received from the paging device(100), and generates an output signal. The second display(250) displays a paging message corresponding to the functional key. A speaker(280) transmits a message corresponding to the output signal to an owner of the receiver(200). The second RF transceiver(210) converts an ACK(Acknowledge) signal into a modulated transmission signal to transmit the signal to the paging device(100), and applies the binary digital data to the second signal processor(230).

Description

Portable radio paging system and method thereof

The present invention relates to a portable wireless paging system and method thereof, and more particularly, to a location of a child and a wireless paging device in which various messages of a guardian are wirelessly transmitted to the wireless paging receiver according to the operation of the wireless paging device. The present invention relates to a portable wireless paging system and a method for detecting a deviation from the set behavior radius from the wireless paging device.

In general, children over 4 years old to 13 years old to start outdoor activities, or the elderly or mentally disabled children need to be monitored by parents or guardians because the ability to judge the situation around the situation is poor. In particular, children between the ages of 10 and 13, whose behavioral radius is gradually increasing, may fall into play or go out of their homes due to group behaviors with friends, and may not be able to return home or miss their homes. Frequently it causes anxiety.

This is because parents cannot keep track of children or children playing around the playground or around the house. Therefore, in order to prevent such a phenomenon, it is necessary to know in advance that the child deviates a certain distance from the house where the parent (guardian) is located, and more preferably, how far away the child is located from the house. The parent needs to be able to monitor it.

In recent years, group residences, such as apartment complexes, have installed cameras for monitors in children's playgrounds and have facilities to check the children's behavior through videophones inside the apartments connected by wire, but when children leave the playground, There is a problem that cannot be traced.

In addition, there is a growing trend to call a child as needed after having a child to carry it using the existing cellular radio calling system.

However, such a conventional wireless calling system requires the wireless call receiver to register as many members as necessary, and pays a service fee to the wireless calling service provider each time the wireless call is made, and the parent checks the current position of the child. There is a problem that can not be helped when parents want to find children, and also that the children are not able to know in advance.

In addition, when children go out to the department stores, markets, various amusement facilities, and various sports stadiums where many people are gathered outside the house, children who are separated from their parents are often lost or abducted. There is a need for a portable portable child calling and child position detection device that can be made.

In addition, in order to control a large number of inmates, such as when the group is hiking outdoors, especially in the mountains, several selected instructors have used radios to communicate location and message.

However, this communication method is difficult to be worn by many children or students because of the expensive communication device, and there is a limit to the person to be informed of the position of the person in charge with the request of emergency relief in case of simply delivering the message of the leader in charge or having an accident.

Accordingly, the present invention has been made in view of the problems of the prior art, and its object is to wirelessly transmit various messages of the guardian to a child's radio call receiver according to the operation of the radio call device, or to wear a radio call receiver. The present invention provides a portable wireless paging system capable of detecting a child's position and warns a guardian of a child through a wireless paging device that deviates from a set action radius from the wireless paging device.

It is another object of the present invention as a group can be delivered to the person in charge of the leader in the play facility, amusement park or mountain climbing of a certain space as a group, the person in charge of the leader in charge of the radio call receiver to the guardian or instructor responsible for emergency relief To provide a low-cost portable radio calling system and a control method thereof can be requested.

Another object of the present invention is to provide a location tracking system capable of quickly positioning a child, such as a child wearing a radio call receiver in case of an accident.

Figure 1a is a front view showing a radio calling device and a radio call receiver of a portable radio call system according to the present invention,

1B is a rear view of the radio page receiver,

2 is a table showing the functions of a portable radio call system according to the present invention;

3 is an overall schematic block diagram of a portable paging system having a duplex type paging device and a paging receiver according to a first embodiment of the present invention;

4A and 4B are detailed block diagrams of the wireless paging apparatus of FIG. 3;

5A and 5B are detailed block diagrams of the radio page receiver of FIG. 3;

6 is a block diagram of a radio unit for a portable paging system having a simplex wireless paging apparatus and a paging receiver according to a second embodiment of the present invention;

7 is a control flowchart for a wireless paging apparatus according to the present invention;

8 is a control flowchart for a radio call receiver according to the present invention;

9 is a transmission data format between a radio calling apparatus and a radio call receiver according to the present invention.

-Code description of main parts of drawing-

100: wireless call device 200: wireless call receiver

101 (201): antenna 110: RF transceiver

111 (211): Transmit / Receive Bandpass Filter 112 (212): Transmit / Receive Antenna Selection Switch

113 (213): RF amplifier 114 (214): First band pass filter

115 (215): first mixer circuit 116 (216): receiving voltage controlled oscillator

117 (217): PLL 118 (218): Crystal

119 (219): second band pass filter 120 (220): intermediate frequency amplifier

121 (221): Second mixer circuit 122 (222): Second local oscillation circuit

123 (223): fourth band pass filter 124 (224): third band pass filter

125 (225): FM demodulator 126 (226): Comparator

127 (227): Transmit voltage controlled oscillator 128 (228): Power amplifier

129 (229): variable resistor 130 (230): signal processing unit

131 (231): CPU 132 (232): ROM

133 (233): RAM 134 (234): Crystal

150 (250): Display 151 (251): LCD

152 (252): LCD Controller 170 (270): Input Device

171: function key 190 (280): speaker

205: pin 255: LED

271: emergency rescue button 290: vibration motor

In order to achieve the above object, the present invention provides a wireless calling device having a wireless transmission and reception function; At least one radio call receiver for receiving a radio call message of the radio call device within a predetermined distance.

The wireless calling apparatus includes first distance signal generating means for generating a distance signal representing a distance to the receiver by comparing a received signal strength indicator (RSSI) signal proportional to the distance from the receiver with a multi-stage basic value, a microprocessor and its A first memory having a memory required for operation, controlling communication with the receiver, obtaining a distance corresponding to the position of the receiver based on the distance signal, and determining whether the receiver deviates from the set range according to the distance signal; A first display for displaying a signal processor, a distance indication where the radio call receiver generated from the first signal processor is located, a message code corresponding to a function key to be transmitted to the receiver, and a radio call to be transmitted to the first signal processor A first input device including a plurality of function keys for inputting a message, and the first input device The wireless call signal received through the first signal processor is converted into a modulated transmission signal for wireless transmission, and the demodulated signal processing of the radio wave (RF) radio wave signal received through the antenna is used to generate binary digital data. And a first RF transceiver for applying the RSSI signal to the distance signal generating means, and warning means for notifying the guardian that the receiver is out of a set range according to the warning signal.

The wireless call receiver includes a microprocessor and a memory required for its operation, and controls a communication with the wireless call device, and analyzes a message received from the wireless call device and generates an output signal corresponding to the second signal processor; A second display for displaying a wireless call message corresponding to a function key transmitted from the wireless calling device, message transmission means for delivering a message corresponding to the output signal to a receiver wearer, and an acknowledgment signal (ACK) A second RF which receives binary data from the processing unit, converts it into a modulated transmission signal, performs wireless transmission to the radio calling apparatus, and applies binary digital data obtained by demodulation signal processing of the radio wave signal transmitted from the radio calling apparatus to the second signal processing unit; It consists of a transceiver.

The receiver further includes an emergency rescue button for the wearer to send an emergency rescue request to the wireless paging device, wherein the wireless paging device can activate warning means when an emergency rescue request is received from the receiver.

In addition, the message transmission means of the receiver is composed of any one of an electro-speech converter for delivering the message to the intermittent sound or melody, and a vibration motor for notifying the wearer to receive the message by vibration.

The modulation method of the transmission signal is preferably made of any one of FM modulation, AM modulation, QPSK modulation, DPSK modulation.

Further, the first signal processor further includes a free channel searching unit for searching for a free channel by comparing the RSSI signals received from all channels with a first reference value, and transmits and receives a message in a multi-channel communication method.

The apparatus may further include a warning signal generating means for generating a warning signal when the receiver deviates from the set range from the wireless calling apparatus by comparing the RSSI signal received from the wireless calling apparatus with a set basic value. When the warning signal is generated, it is preferable that the message transmitting means is operated.

The distance indication for the first display is indicated by a bar bar in inverse proportion to the distance or numerically.

The first and second RF transceivers each output a binary digital data to the signal processor by demodulating a frequency down conversion unit for performing two-stage frequency down conversion of the RF received signal and the down-converted frequency. And a demodulator and transmission means for receiving data to be transmitted from the signal processor and converting the data to a modulated transmission signal to perform wireless transmission.

According to another aspect of the present invention, searching for a free channel and transmitting free channel information to a wireless call receiver according to system activation of a wireless call apparatus, and setting the free channel as a use channel according to the reception of the free channel information. And transmitting an acknowledgment signal to the wireless calling apparatus, and after receiving the acknowledgment signal, displaying a message on the display of the wireless calling apparatus according to the operation of a function key and transmitting message information to the receiver through the free channel. And displaying the message on the display of the receiver according to the reception of the message information, and informing the wearer of the message reception through the output device.

In addition, the wireless calling apparatus measures the electric field strength of the radio wave received from the receiver, and compares the electric field strength of the received radio wave with a multi-level reference value to determine the distance between the radio call apparatus and the receiver to determine the distance of the radio call apparatus. The display may further include displaying the number of bar bars inversely proportional to the distance.

As described above, the wireless paging system of the present invention can wirelessly transmit various messages of the guardian to the wireless paging receiver of the child according to the operation of the wireless paging device, or detect the position of the child wearing the paging receiver. In other words, the guardian can be alerted to the guardian through the radio caller to be out of the set radius of action.

In addition, in the present invention as a group, the leader in charge of the play facilities, amusement park or mountain climbing in a certain space can deliver the message of the person in charge to the leading person, the wearer of the radio call receiver to provide emergency relief to the guardian or person in charge On request it is possible to have a personal portable radio calling system at low cost.

The present invention can quickly locate a child wearing a wireless call receiver by using a bar bar indicating a distance between the wireless call device and the receiver in case of an accident or an accident.

(Example)

Hereinafter, with reference to the accompanying drawings showing a preferred embodiment of the present invention described above in more detail.

1A is a front view showing a wireless paging apparatus and a wireless call receiver of the portable paging system according to the present invention, FIG. 1b is a rear view of the wireless paging receiver, and FIG. 2 is a function of the portable paging system according to the present invention. The table shows.

3 is an overall schematic block diagram of a portable paging system having a duplex type paging device and a paging receiver according to the first embodiment of the present invention, and FIGS. 4a and 4b are views of the paging device of FIG. 5A and 5B are detailed block diagrams of the radio page receiver of FIG.

First, referring to FIG. 1A, the portable paging system according to the present invention includes a paging apparatus 100 having a wireless transmitting / receiving function and a paging receiver 200 capable of receiving a guardian's message at a predetermined distance from the paging apparatus 100. It consists of).

In this case, the wireless paging device 100 may include, for example, a parent who resides in a house or a guardian bringing a child to a place where a large number of people, such as an outdoor or a department store, are provided, and the wireless paging receiver 200 is a young child. It is worn by the elderly and the elderly.

The guardian transmits various types of messages to the radio call receiver 200 by serial radio communication using the 10 key or the function keys F0-F9 of the radio call device 100.

In this case, the wireless call receiver 200 displays a simple message corresponding to each function key on the LCD display 250, and transmits a melody corresponding to each message through a speaker or a small speaker 290 having a buzzer or buzzer function. The buzzer sounds M1-M10, and transmits a message to the called party by vibration using the vibration motor 280 as necessary (see FIG. 3).

It displays a simple text message on the LCD display 250 for children who can read Hangul, and hear different melody sounds through speakers or buzzers 290 for children or children who do not know Hangul, hearing impaired, mentally weak It is desirable to deliver a message that can be easily distinguished using the vibration motor 280 for the elderly who are difficult to reason.

For example, as shown in the table of FIG. 2, when the function key F1 of the wireless paging apparatus 100 is operated, the message 250 is displayed on the display 250 of the wireless paging receiver 200. Character is blinking and a continuous intermittent sound is emitted through the speaker 290.

In addition, in the case of the function key F2, the return request does not require an emergency. In this case, the display 250 of the radio call receiver 200 displays the words "return request", and a discontinuous intermittent sound or a previously promised melody sound. , For example, "a pleasant home" to be emitted through the speaker 290.

In addition, when the child in the play tells the time to go to the school, the function key (F3) is activated, in this case, the display 250 of the radio call receiver 200, the words "returning ears" is displayed, For example, the "school paper clink" melody is played through the speaker 290.

To this end, as shown in FIG. 1A, the wireless paging device 100 has an LCD display 150 located at an upper side of the device, and at the bottom, ten 10 keys (0-9) or function keys 171 (F0-F9). And a function button (FUN) 172 for switching a function of the function keys 171 (F0-F9) to 10 keys or vice versa or selecting a function mode such as a time setting function, and a power button (PWR) 173. ) Are concentrated.

In addition, in the middle line of the device, if the radio call receiver 200 deviates from the radio call device 100 at a certain range, for example, 500 meters (elementary school students) or 50 meters (children under 8 years old). A speaker (with buzzer function) 190 that generates a beep to inform the guardian, and the message to be transmitted on the left side is selected using the function keys (F0-F9) and the selected message code, that is, the function key number "F1 (emergency) A call button (SEND) 174 is located to give the user a chance to confirm that the call is correct, and on the right hand side, an incorrectly selected function key number, for example "F1 (emergency call)", is displayed on the display 150. If indicated, a clear button (CLR) 175 is located to correct this.

The wireless paging device 100 measures / determinates how far the wireless paging receiver 200 is from the wireless paging device 100 and accordingly displays the number of bars of the bar 153 on the display 150. There is a function that allows the guardian to know the distance 200 is away.

For example, if the operating range of the wireless paging system is designed to be 500 meters (M), and the bar bar 153 exhibits the highest sensitivity (that is, the shortest distance) in which all five bar bars 153 are displayed, the wireless paging receiver 200 When it is within 100 meters (M), when four people are within 200 meters (M), when one person is within 500 meters (M), when no bar bar 153 is displayed Indicates a case out of the defined 500 meter (M) range.

The distance bar bar 153 is the five bar bar 153 showing the highest sensitivity when the operating range of the system is 50 meters (M) when the radio call receiver 200 is within 10 meters (M) Can be configured to be displayed.

The distance bar bar 153 can be a great help in tracking the location of the missing child since the displayed number of the bar bar 153 increases as the child approaches the child when missing.

This function compares the RSSI signal received from the FM demodulator 125 of the wireless paging apparatus 100 to be described later with a default value, and compares the RSSI signal with a multi-level level comparison step in finding an empty channel. By comparing the reference value Ref1-Ref5 with the multi-levels in step 26), the distance to the radio call receiver 200 can be determined.

In this case, for example, the bar bar 153 is located at a distance of one meter, that is, 400 meters (M) in order to prevent the child from escaping by notifying the guardian in advance before the child leaves the operating range of 500 meters (M) of the system. A warning message for the preliminary warning may be acted on the wireless paging device 100 to alert the guardian by operating an intermittent sound or a melody of the buzzer.

In this case, the guardian may activate the function key (F5) before the child completely leaves the operating range of the set system and transmit a message "Do not go far" to the child's radio call receiver 200, and ring a melody accordingly. do.

If it is determined that the child is out of the operating range of the set system as a result of detecting the RSSI signal, the paging device 100 causes the guardian to alert the guardian to the area where the child is set by the speaker 190. Departure, I urge you to deal with it.

Therefore, the guardian can find the child before the child leaves the area and go no further, and prevent the child from being lost or kidnapped by Nassum.

Meanwhile, as shown in FIG. 1A, the wireless call receiver 200 forms a heart shape, a disk shape, or various animal shapes so that children do not have to wear them as accessories, and the LCD display 250 displays a current time and a message from a guardian on the front. ) And a speaker (buzzer) 290 for emitting intermittent sound or melody is provided.

In addition, the receiver 200 has a plurality of LEDs 255 are arranged outside the housing 202 to allow the vehicle driver to easily identify the child during the night traffic, for example, the child above the emergency state, for example For example, an emergency rescue button 271 is provided to notify parents when they are in a dangerous situation such as kidnapping or injury, and an LED operation switch 273 for selecting and operating the LED 255 by the child as needed. ) May be provided on the front or the back.

Of course, when the emergency rescue button 271 is operated, it is also possible to generate an intermittent sound from the speaker 290 to receive a rescue from people located nearby. In addition, if necessary, the parent operates the function key F7 of the wireless paging device 100 to remotely generate emergency rescue interruptions to the speaker 290 or press the function key F6 to drive the LED 255 blinking. It is also possible.

In addition, the rear surface of the radio call receiver 200 is a rod-shaped or circular battery housing cover 207 for supplying power to the receiver is located.

Of course, the receiver 200 is a children's (or elderly) or adult wearer's personal clothing, such as belt buckle, suspenders, bag straps, headbands, wrists, hats, glasses, such as sunglasses, clothing, necklaces, watches , Sports bands, socks, pants hem decorative bands, etc., may be integrated with or fixed to the detachable pin 205 may be selected. When the receiver is integrally fixed, the LCD display 250 may be omitted as necessary.

As shown in FIG. 3, the wireless paging apparatus 100 includes a microprocessor (CPU) and a memory for operation thereof, and a bar bar corresponding to system control and position of a receiver of the wireless paging system as shown in FIG. 7. Signal processing unit 130 for generating display and time display data, the number of bar bars 153 corresponding to the distance where the wireless call receiver 200 is located, and the current time display data and the function key to be transmitted to the receiver 200. A display 150 for displaying a message code corresponding to (F0-F9), an input device 170 for inputting an external wireless call message to the signal processor 130, and the input device 170 The wireless call signal received through the signal processing unit 130 is converted into a frequency shift keying (SKS) modulated transmission signal of the UHF band for wireless transmission, and the radio wave signal received through the antenna (101) Demodulate RF transmitter / receiver 110 for calling and applying binary digital data to signal processor 130, and alerting guardian when wireless call receiver 200 is about to move out of or set system operating range or from receiver or receiver When an emergency rescue request is received it is composed of a speaker (buzzer) 190 to inform the guardian.

In addition, the radio call receiver 200 includes a microprocessor (CPU) and a memory for operation thereof, a signal processor 230 for generating various control and time display data of the radio call receiver, and the radio call device 100. A display 250 for displaying the wireless call message and the current time display data corresponding to the function keys F0-F9 transmitted from the device), and a speaker (buzzer) for generating an intermittent sound or melody corresponding to the wireless call message. 290, the acknowledgment signal (ACK), the emergency rescue request signal and the like received from the signal processing unit 230 converts it to the FSK-modulated transmission signal of the UHF band and performs radio transmission to the wireless paging apparatus 100, For example, RF transmission and reception for applying binary digital data obtained by demodulation signal processing of radio wave signals transmitted from the radio call apparatus 100 through the loop antenna 201 to the signal processor 230. The bride 210 is composed.

Furthermore, the receiver 200 is provided with a vibration motor 280 for notifying a wearer, such as a child, of receiving a message by vibrating as necessary, and is installed outside the receiver 200 to enable visual location identification from a distance at night. LED 255 to prevent accidents, emergency rescue button 271 for the wearer (child) to send an emergency relief request to the wireless paging device 100, and LED operation switch for driving the LED 255 The apparatus further includes an input device 270 including a 273.

Data communication between the wireless paging device 100 and the wireless call receiver 200 is performed by serial communication using wireless, for example, as shown in Figure 6, RF transceiver 310, 410 With a simplex method of one-way communication that can be transmitted only in the wireless calling device 100, only the reception in the wireless call receiver 200, and as shown in Figures 4a to 5b, And both the wireless call receiver (100,200) can be implemented in a duplex (Duplex) method of bidirectional communication that can transmit and receive data.

In addition, in the simplex method, one communication channel is selected to transmit or receive data. In this case, the radio call receiver 200 cannot determine whether the message is properly received, but in the duplex method, the same carrier frequency band is used. Channels can be used separately to prevent interference in use, increasing the accuracy and efficiency of communication. In this case, one channel space may normally use 12.5 KHz or 25 KHz.

First, the detailed configuration and operation between the duplex type wireless paging device 100 and the wireless paging receiver 200 will be described with reference to FIGS. 4A, 4B, 5A, and 5B.

The wireless paging device 100 and the wireless paging receiver 200 have a nearly similar structure in order to communicate with each other in a duplex manner, and the difference between them is that the transceiver is transmitted to the RF transceiver 110 of the wireless paging device 100. In order to find an empty channel that is not used, a comparator 126 is installed to compare the received signal strength indicator (RSSI) signal generated by the FM demodulator 125 with a default value to find an empty channel and measure a distance from the receiver. And elements 190 (290, 280, 255) connected as input devices (170, 270) and message output devices are different.

In the wireless paging system of the present invention, the caller 100 converts the transmission data into a frequency shift keying (FSK) modulated transmission signal using a 447 MHz carrier frequency of the UHF band, and performs radio transmission. The conversion is performed to extract binary data from it.

Referring to the wireless call device 100 as an example.

A transmit / receive band pass filter (BPF) 111 is installed next to the antenna 101 so that only signals having a frequency within a certain range specified at the time of transmit / receive are transmitted / received.

Transmit and receive antenna selection switch 112 for connecting the antenna 101 to either the transmitting or receiving end is connected to the rear end of the transmission and reception bandpass filter 111, which will be described later. Selection is made under control of the microprocessor (CPU) 131.

Receiver Operation

In the receiving end, the RF amplifier 113 is connected to the rear end of the transmission / reception antenna selection switch 112 and undergoes amplification for low noise amplification before signal processing the weak signal received through the antenna 101.

Thereafter, only the signals of the necessary band are passed by passing through the first band pass filter (BPF1) 114 to block unnecessary noise components from being amplified together.

In general, when using a high carrier frequency of the UHF band for a relatively long range wireless communication, after converting to a low frequency signal through multiple stages of downconverting, the signal is demodulated and transmitted from a transmission data signal, that is, the receiver 200. Obtain the transmission signal.

Also in the present invention, the output signal of the first band pass filter 114 is a local oscillation frequency (LOF) of 447 MHz and a first mixer circuit supplied from a receiving voltage controlled oscillator (RX VCO) 116 constituting a local oscillation circuit. In step 115, only a 21.65 MHz signal is obtained from the second band pass filter BPF2 119 as a difference signal of two signals.

In this case, the VCO 116 forming the local oscillation circuit sets the local oscillation frequency LOF of the VCO to 447.8625 to 447.9875 MHz (channel space; 12.5 KHz, 11 channels according to the control data CN2 applied from the CPU 131). Is connected to a phase locked loop (PLL) 117 for varying the control voltage so that the control voltage can be varied. Therefore, it is possible to easily change the reception signal of the desired channel according to the change of the local oscillation frequency (LOF).

The output of the second band pass filter 119 is applied to the second mixer circuit 121 after being amplified by the first intermediate frequency amplifier 120 to compensate for signal attenuation during filtering. An oscillation signal of the second local oscillation circuit 122 oscillated using the crystal 118 of the PLL 117 is applied to the 121 through the fourth band pass filter 123.

Thereafter, only the difference signal of 445 KHz is obtained by filtering from the third band pass filter 124 among the sum / difference signals formed according to the mixing of the two frequency signals applied to the second mixer circuit 121.

Subsequently, the filtration output of the third band pass filter 124 is input to the FM demodulator 125 so that only the demodulated binary data is applied to the RX terminal of the CPU 131, and the received data is processed in software.

On the other hand, the wireless calling apparatus 100 compares the level of the received signal obtained from the RSSI output terminal of the FM demodulator 125 with the multilevel reference voltages Ref1-Ref5 in the comparator 126 to find an empty channel to use. By applying to the RSSI port of 131, the CPU 131 is referred to as information on the free channel at the time of data transmission.

Transmitter Operation

On the other hand, when the radio call data is to be transmitted to the receiver 200, binary data to be transmitted from the transmission terminal TX of the CPU 131 is applied to the transmission voltage controlled oscillator (TX VCO) 127. At this time, the VCO 127 of the modulation circuit oscillates the carrier frequency of the desired channel, for example, 447 MHz, according to the control voltage applied from the PLL 117, and modulates the radio call data into the FSK using this oscillation signal.

The modulated signal is then amplified in the transmission power amplifier 128 to obtain an output signal of the desired intensity, and then the antenna selection switch 112 is selected by the CPU 131 to transmit the antenna through the transmission bandpass filter 111. Fired from 101. Reference numeral 129 is a variable resistor for adjusting the transmission output.

Wireless call and time display of the wireless pager

The signal processing unit 130 of the wireless calling apparatus 100 is a ROM 132 storing a system control program centering on the CPU 131 and a RAM 133 for temporarily storing data being processed. ADD BUS) and data bus.

In the ROM 132 of the radio call apparatus, as described later, a first subroutine for searching for an empty channel, a second subroutine for forming and interpreting a transmit / receive data format, and a third subroutine for clock motion processing, as described below. A fourth subroutine for processing the routine and the code data for transmission according to the operation of the radio call function keys (F0-F9) 171, a bar bar display corresponding to the position of the radio call receiver, an emergency rescue request and operation The code data to be transmitted in accordance with the operation of the program consisting of the fifth subroutine for processing the warning of deviation from the area and the function keys F0-F9 for radio calling are stored.

The time display of the wireless paging device 100 is actually implemented in software in the CPU 131. The third subroutine for clock movement processing is data generated every second using a timer in the CPU 131. Count to generate time display data.

On the other hand, the display 150 for the pager adopts, for example, the LCD 151 in consideration of the use of a battery, and the driving thereof includes the message data and the character data to be displayed on the LCD corresponding to the code data to be transmitted in the ROM. The LCD control chip is used as the LCD controller 152 to drive the LCD 151 by receiving display data.

In addition, in the input device 170 for inputting an external operation signal of the wireless paging device 100, a plurality of function keys F1 to F10 are connected to a key scan input port of the CPU 131.

On the other hand, the RF transceiver 210 of the receiver 200, as described above, except for the configuration to find the empty channel and the receiver position signal using a comparator and the RF transceiver 110 of the wireless calling device 100 The signal processor 230 is identical in hardware (H / W) to the signal processor 130, but the control program and data stored in the ROM 232 are different from each other.

In the ROM 232 of the radio call receiver 200, a first subroutine for forming and interpreting a transmission / reception data format, a second subroutine for clock movement processing, and a transmission according to the operation of the emergency rescue button 271 are used. A third subroutine for processing the code data, a fourth subroutine for processing the driving of the speaker 290, the vibration motor 280, and the LED 255 corresponding to the code data in a wireless call, and an emergency rescue request And a control program comprising a fifth subroutine for processing a warning according to the departure of the operating area and message data corresponding to the received code data.

Furthermore, the receiver of the receiver 200 compares the RSSI signal generated from the FM demodulator 225 with the fifth reference voltage Ref5 to detect whether the receiver 200 is out of the set operating range. 226 may be installed.

An emergency rescue button 271 and an LED operation switch 273 are connected to the kisscan input port of the CPU 231 as an input device 270, and a speaker 290, a vibration motor 280, as a message output device. LED 255 is provided. The display 250 used as a message output device is composed of an LCD 251 like a wireless caller, and an LCD controller 252 for driving the LCD 251 by receiving display data supplied from the CPU 231 is provided. It is connected between.

The operation of the wireless paging system according to the present invention configured as described above will be described in detail below with reference to FIGS. 7 to 9.

First, when the power of the radio call apparatus and the radio call receiver 100,200 is turned ON, the programs, as shown in FIGS. 7 and 8, are sequentially executed by the reset circuits of the CPUs 131 and 231, respectively.

The wireless paging device 100 compares a signal received from the RSSI terminal of the FM demodulator 125 of the receiving end with a channel not currently used externally among the channels to be used for the first time to the reference value Ref1 in the comparator 126. On the basis of this, the CPU 131 determines the channel to be searched and used (S1).

At the same time, based on the result of comparing the signal received from the RSSI terminal with the reference value Ref1-Ref5 in sequence in the comparator 126, the CPU 131 determines how far the radio call receiver 200 is from the radio call apparatus 100. FIG. It is determined whether it is in a distant position to determine the display number of the bar bar 153 to be displayed on the LCD 150 and displays it on the LCD 150 (S2, S3).

For example, if the RSSI signal strength is greater than the reference value Ref5, the highest signal sensitivity, i.e., the receiver is located within 100M, and if the RSSI signal strength is smaller than the reference value Ref5, and greater than the reference value Ref4, the receiver. Is located between 100M-200M.

As described above, when the RSSI signal strength received from all channels is smaller than the reference value Ref1 as compared with the reference values Ref5-Ref1, it is determined that the receiver 200 is not located within the operating range, that is, within 500M. To generate a warning intermittent sound through the speaker 190 for a predetermined period (S4, S5).

Thereafter, in order to avoid interference in communication, that is, to share the empty channel (CH) information with each other, the FSK modulation is transmitted to the radio call receiver 200 through the transmitting end of the RF transceiver 110 (S6).

In this case, the format of the data to be transmitted consists of a 3-byte signal, as shown in FIG. That is, BIT0-BIT1 of the first byte is the location number of the user, BIT2-BIT7 is the ID code (manufacturer code), BIT0-BIT3 of the second byte is empty channel information, and BIT4 is the wireless calling device 100 from the receiver 200. Information indicating the reception completion (ACK) of the transmission data, BIT5 is the transmission source information of the radio call device and the receiver (100,200), BIT6-BIT7 is the location number of the destination, BIT0-BIT3 is the third byte The cost bits, BIT4-BIT7, represent code data for wireless calling of the wireless calling apparatus 100, respectively.

Thereafter, when the reception completion signal ACK of the transmission data is received from the radio call receiver 200 receiving the free channel information (S7), one communication is completed.

Then, when the parent presses the function key F1 of the wireless calling device 100 (S8), the CPU 131 detects this and applies the input code data and message display data to the LCD controller 152 to display the LCD ( In step 151, the function key name and the message "F1 (emergency call)" are displayed (S9).

Subsequently, when the user (parent) correctly inputs a message code to be called, the send button (SEND) 174 is pressed, and when the user inputs a wrong message, the erase button (CLR) 175 is used to erase and input again.

When the send button 174 is pressed, the input wireless call message code is edited into a 3-byte transmission data format and is applied to the transmitting end of the RF transmitting / receiving unit 110 through the transmitting terminal TX by the above-described modulation method to receive the receiver 200. (S10).

After going through a certain time waiting routine (S11), which takes a certain time to transmit and receive data, for example, it waits for example several hundred ms.

Subsequently, it is determined whether the reception completion signal ACK of the transmission data is received from the receiver 200 as described above (S12).

When the reception completion signal (ACK) of the transmission data is received from the receiver 200 as a result of the determination, the wireless call device 100 displays the "reception completion signal (ACK)" on the LCD 150, and operates the speaker 190. Informs that the wireless call is made safely (S125).

This answer-back function can confirm that the wireless call message transmitted from the guardian is surely delivered to the child wearing the receiver 200, thereby increasing the reliability of the wireless call.

In addition, when the radio call device 100 includes the emergency rescue request message in the received signal according to the operation of the emergency rescue button 271 from the receiver 200, the CPU 131 sends an "emergency rescue request" to the LCD 150. While controlling the LCD controller 152 to display a message, the speaker 190 is operated to generate a warning intermittent sound (S13 and S14).

On the other hand, in the radio call receiver 200, after the power is turned on (ON) when the transmission signal containing the empty channel information from the radio call device 100 is obtained as binary data through the receiving end of the RF transceiver 210 The CPU 231 stores the data received through the RX terminal in the RAM 233 and then determines whether its ID code stored in the ROM 232 matches the ID code of the received data (S21-S23).

If the ID code matches, the received data is received and the self-use channel is determined and set according to the free channel (CH) information included in the received data (S24).

In addition, the reception completion signal (ACK) is transmitted to the radio call apparatus 100 at the same time as the reception of the empty channel information (S25).

Thereafter, it is determined whether a wireless call message is received from the wireless call device 100 (S26). If the call message is received, the CPU 231 executes a fourth subroutine, as shown in the table of FIG. The melody corresponding to the received message may be generated by the speaker 290, the vibration motor 280 may be operated, or the blinking driving of the LED 255 may be processed.

At the same time, by outputting the message data to the LCD controller 252, the message " emergency call " is displayed on the LCD 251, and the reception (ACK) of the message is transmitted to the radio call apparatus 100 (S27, S28).

In addition, the radio call receiver 200 is similar to the radio call apparatus 100, when the RSSI signal strength received from all channels obtained from the FM demodulator 225 is smaller than the reference value Ref1, the receiver 200 is within the operating range, That is, it is determined that the case is not located within 500M and generates a warning intermittent sound through the speaker 290 for a predetermined period (S29, S30).

As described above, in the present invention, the user (parent) selectively transmits a call message to the child or the child wearing the receiver 200 by selectively operating the function keys F0-F9 as necessary to call the child. In addition, by knowing in advance that the child is out of the set area it is possible to prevent the child's occurrence or abduction.

Moreover, this operation can be performed in a variety of functions in any outdoor location without paying the service provider, thereby pursuing cost savings and convenience.

In addition, in the wireless paging system of the present invention, the instructor responsible for delivering a message of the instructor to a large number of participants, such as a play facility, amusement park or mountain climbing in a certain space as a group, the wearer of the radio call receiver is the guardian or instructor You can ask for emergency relief.

In this case, the 6-bit ID code is used to input a number according to the function switching of the function key 171, and when the combination of the input ID code and the function key is transmitted to a plurality of receivers, only the receiver whose ID code matches The sent message can be received, allowing for selective calling.

Meanwhile, in the above description, the system configuration of the first exemplary embodiment according to the duplex method has been described. However, as shown in FIG. 4, the wireless paging apparatus 100 transmits only the RF transmitter 310 and transmits the wireless paging receiver ( 200, it is also possible to take the simplex method according to the second embodiment of the one-way communication capable of only receiving with the RF receiver 410. That is, in the second embodiment, the signal processor and the display are configured in almost the same way as the first embodiment, and only the RF transceiver is changed.

In Figure 4, reference numeral 301 is an antenna, 311 is a transmission band pass filter, 318 is a crystal, 327 is a voltage controlled oscillator for transmission, 328 is a power amplifier, 329 is a variable resistor, 401 is an antenna, 411 is a reception band pass filter, 413 RF amplifier, 414 is bandpass filter, 415 is first mixer, 416 is first local oscillator, 419 is bandpass filter, 420 is intermediate frequency amplifier, 421 is second mixer, 422 is second local oscillator, 424 is The band pass filter 425 denotes an FM demodulator, respectively.

The simplex wireless call device 100 and the wireless call receiver 200 are required to have a single channel transmitter 310 or receiver 410.

Accordingly, the transmitting unit 310 of the wireless paging device 100 modulates the transmission data received from the CPU by the FSK method by the 447 MHz carrier signal oscillated by the transmission voltage controlled oscillator (TX VCO) 327. After amplified by the bandpass filter 311 is launched from the antenna 301.

In addition, since the reception unit 410 of the radio call receiver 200 is a short channel, the reception process of the signal is almost identical except that the PLL circuit is omitted in the first embodiment.

That is, in the simplex method, whenever the function key F0-F9 is simply pressed in the wireless paging device 100, the corresponding message data is transmitted in the data format shown in FIG. 9, and the receiver 200 receives and interprets the message data. Displays a message on the LCD and plays the melody through the speaker.

On the other hand, the above-described first and second embodiments of the present invention have been described using a method and a system for transmitting and receiving a signal using an FSK modulation method that can be used within the framework of the current method as an example, but the present invention is not limited thereto and is based on other known modulation methods. The transmission and reception system can be made.

For example, in the case of the amplitude modulation method, an AM demodulator may be used in place of the FM demodulator described above in a receiver, and AM modulation may be configured in a known manner in place of FM modulation in a transmitter. In addition, the system configuration may be made by a person skilled in the art according to a Quadrature Phase Shift Keying (QPSK) or Differential Phase Shift Keying (DPSK) method, which is a kind of pulse modulation (PM).

In the above-described embodiment, the distance between the receiver and the radio pager is displayed as the number of bar bars. However, in addition to the display method, it is also possible to display the direct distance display in 100 meters (M) or 300 meters (M).

As described above, the wireless paging system of the present invention can wirelessly transmit various messages of the guardian to the wireless paging receiver of the child according to the operation of the wireless paging device, or detect the position of the child wearing the paging receiver. In other words, the guardian can be alerted to the guardian through the radio caller to be out of the set radius of action.

In addition, in the present invention as a group, the leader in charge of the play facilities, amusement park or mountain climbing in a certain space can deliver the message of the person in charge to the leading person, the wearer of the radio call receiver to provide emergency relief to the guardian or person in charge On request it is possible to have a personal portable radio calling system at low cost.

The present invention can quickly locate a child wearing a wireless call receiver by using a bar bar indicating a distance between the wireless call device and the receiver in case of an accident or an accident.

The present invention has an answer-back function for confirming that the wireless call message transmitted from the guardian is surely delivered to the child wearing the receiver 200, thereby increasing the reliability of the wireless call.

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments, and the present invention is not limited to the spirit of the present invention. Various changes and modifications will be possible by those who have the same.

Claims (11)

A wireless paging device having a wireless transmission / reception function; Is composed of at least one radio call receiver for receiving a radio call message of the radio call device within a predetermined distance, The wireless calling device First distance signal generating means for generating a distance signal representing a distance to the receiver by comparing a received signal strength indicator (RSSI) signal proportional to the distance from the receiver with a multi-stage basic value; It has a microprocessor and memory necessary for its operation, controls communication with the receiver, obtains a distance corresponding to the position of the receiver based on the distance signal, determines whether the receiver is out of the set range according to the distance signal, and generates a warning signal. A first signal processor to generate, A first display for displaying a distance indication where the radio call receiver generated from the first signal processor is located and a message code corresponding to a function key to be transmitted to the receiver; A first input device including a plurality of function keys for inputting a radio call message to be transmitted to the first signal processor; The wireless call signal received through the first input device is received from the first signal processing unit and converted into a modulated transmission signal for wireless transmission, and the radio wave signal received through the antenna is demodulated signal processing 2 A first RF transmitting and receiving unit for applying the binary digital data to the first signal processing unit and providing the RSSI signal to the distance signal generating unit; It consists of a warning means for alerting the guardian that the receiver is out of the set range according to the warning signal, The radio call receiver is A second signal processor having a microprocessor and a memory necessary for its operation, controlling communication with the wireless calling apparatus, analyzing a message received from the wireless calling apparatus, and generating an output signal corresponding thereto; A second display for displaying a radio call message corresponding to a function key transmitted from the radio call device; Message transmitting means for delivering a message corresponding to the output signal to a receiver wearer; Receives the acknowledgment signal (ACK) from the signal processing unit, converts it into a modulated transmission signal, performs wireless transmission to the radio calling apparatus, and demodulates the binary digital data obtained by demodulation signal processing of the radio wave signal transmitted from the radio calling apparatus. And a second RF transmitting / receiving unit applied to the second signal processing unit. 2. The system of claim 1, wherein the receiver further comprises an emergency rescue button for the wearer to send an emergency rescue request to the wireless paging device, wherein the wireless paging device activates the warning means when an emergency rescue request is received from the receiver. Characterized by a portable radio calling system. The portable device according to claim 1, wherein the message transmission means of the receiver comprises one of an electric-to-speech converter for delivering a message to an intermittent sound or a melody, and a vibration motor for notifying the wearer of the message by vibration. Wireless calling system. The portable wireless paging system according to claim 1, wherein the modulation method of the transmission signal is one of FM modulation, AM modulation, QPSK modulation, and DPSK modulation. 2. The apparatus of claim 1, wherein the first signal processor further comprises a free channel searching unit for searching for a free channel by comparing the RSSI signals received from all channels with a first reference value, and transmitting and receiving a message in a multi-channel communication method. Portable radio calling system, characterized in that. According to claim 1, Warning signal generating means for generating a warning signal when the receiver is out of the set range from the radio calling device by comparing the received signal strength indicator (RSSI) signal received from the radio call device with a set basic value And further comprising, when the warning signal is a portable radio calling system, characterized in that the message transfer means is operated. The portable wireless paging system of claim 1, wherein the distance indication for the first display is represented by a bar bar in inverse proportion to the distance. 2. The apparatus of claim 1, wherein the first and second RF transceivers each include: a frequency down converter for downconverting the RF received signal by two steps; A demodulator for demodulating the signal having the down-converted frequency and outputting binary digital data to the signal processor; And a transmission means for receiving the data to be transmitted from the signal processor and converting the data to a modulated transmission signal to perform wireless transmission. Searching for an empty channel and transmitting the empty channel information to the radio call receiver according to system startup of the radio pager; Setting the free channel as a use channel according to the free channel information and transmitting an acknowledgment signal to a wireless paging apparatus; After receiving the acknowledgment signal, displaying a message on the display of the wireless calling apparatus according to the operation of the function key, and transmitting message information to the receiver through the free channel; And displaying the message on the display of the receiver according to the message information and informing the wearer of the message reception through the output device. 10. The method of claim 9, wherein the wireless calling apparatus measures the electric field strength of the radio wave received from the receiver; And comparing the electric field strength of the received radio wave with a multi-level reference value to determine the distance between the radio calling apparatus and the receiver and displaying the number of bars on the display of the radio calling apparatus in inverse proportion to the distance. Wireless calling method. 10. The method of claim 9, wherein the receiver transmits a message acknowledgment signal to the wireless calling apparatus when receiving the message information from the wireless calling apparatus; And displaying an acknowledgment message on the display of the transmitter in response to receiving the message acknowledgment signal and notifying the user of the acknowledgment of the message through an output device.