KR960016902B1 - Text pager - Google Patents

Abstract

The transceiver is provided for transmitting and receiving numbers and characters in paging system, and includes an antenna receiving a paging signal, a receiver decoding a RF signal, reproducing the POCSAG signal, and outputting them into a microprocessor, a keypad with the transmission key, a tone generator outputting the DTMF signal by the keypad into a speaker, a RAM storing the message, a ROM storing the code system, an LCD module displaying the message, a microprocessor controlling the entire system.

Description

Text transceiver in paging system and communication method thereof

1 is a block diagram of a text transceiver according to the present invention;

2 is a code classification diagram stored in the ROM of the present invention;

2 (b) is a Hangul code system stored in the ROM of the present invention,

3 is a schematic diagram showing an embodiment of data transmission of a text transceiver according to the present invention;

Figure 4 is a schematic diagram showing another embodiment of the data transmission of the text transceiver according to the present invention,

5 is a flowchart illustrating a process of a microprocessor (CPU) of a text transceiver according to the present invention;

6 is an external view of an embodiment of a text transceiver of the present invention having a keypad;

7 is a schematic diagram showing an embodiment of data reception by the text transceiver according to the present invention.

* Explanation of symbols for main parts of the drawings

1 antenna 2 receiver

4 microprocessor 5 RAM

6: ROM7: LCD Module

8: tone generator 9: keypad

10: Speaker RD: Read Only Bus

WR: Write-only bus DATA: Data bus

INTERUPT: Interrupt Bus

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a text transmitting / receiving apparatus capable of transmitting / receiving not only numbers such as telephone numbers but also letters (Korean, Japanese, English, etc.) and a paging communication method according to the paging system.

Conventionally, a pager having a radio selective calling function has only a function of receiving or receiving a message of limited contents by only sending or receiving a telephone number or preserving a limited message list in advance and inputting a key value of a specific message. With such a conventional pager, it is difficult to inform the counterpart of the urgent situation. In other words, first call the pager with the pager, send out the phone number, wait for the call from the other party (and wait in front of the phone until the call comes) to deliver the case. In this case, the person who wants to deliver the urgent matter not only takes a considerable time to inform the person having the pager, but also has the inconvenience of waiting for a call from the other person. In order to solve this inconvenience, a method of sending a message with a limited content by inputting a predetermined message list in a pager and inputting a key value has been developed, but it has a difficulty in that it can not receive any message other than the message described in the limited message list.

SUMMARY OF THE INVENTION An object of the present invention is to overcome the limitations of the conventional pager, and to provide a text transmitting / receiving apparatus and a paging communication method that can receive and transmit a message without limitation.

According to the invention, an antenna for receiving a paging signal; A receiver for demodulating and decoding an RF signal, which is a paging signal received from an antenna, reproducing a POCSAG signal and outputting the POCSAG signal to a microprocessor; A keypad having a transmission key for inputting letters and numbers; A tone generator for converting an input key value into a DTMF signal and outputting the same to a speaker; RAM for storing entered numeric and text messages; A ROM for storing a control program and a character code system; An LCD module for displaying a received or sent message; And a microprocessor for controlling the whole circuit, wherein the microprocessor receives a telephone number (relative number) and a message input through a keypad when transmitting and reads a code corresponding to the message data from a ROM and stores it in a RAM. While displaying through LCD module, press the transmit key of keypad after inputting phone number and message, receive transmit key signal, access the corresponding phone number and message in RAM, output to tone generator, and by tone generator The tone signal corresponding to the generated telephone number and message key value is transmitted to the talker of the telephone through the speaker to transmit the message to the other party through the telephone network.When receiving, the RF signal received through the antenna is received through the receiver and the decoder. Plays the POCSAG signal corresponding to the called party's telephone number and message, Each character corresponding to each code of the POCSAG signal data reproduced in the RAM is accessed from the ROM, stored in the ROM, and a message is displayed on the LCD module.

The text transmission and reception process according to the present invention will be described in detail with reference to the accompanying drawings.

First, the Hangul message code system used in the text transmitting and receiving apparatus according to the present invention will be described.

Currently, there are 16 types of DTMF signals that can be transmitted / received using public line networks: “1,2,3,4,5,6,7,8,9,0, *, #, A, B, C, D”. 1 nibble = 4 bits of data can be represented.

Therefore, when at least three DTMF signals are used as one code, the size of 3 nibbles (= 12 bits) can represent 4096 code values (ø to FFFH) of the existing two-byte completion code values. Therefore, by using three consecutive DTMF signals, as shown in FIG. 2 (A), it is possible to express the Hangul complete 3648 characters, the transceiver control code, and other user-defined characters. Also, if you use English, a code system of 2 nibbles is sufficient, and it can be expressed as a nibble for expressing other languages.

The Hangul code used in the text transmitting / receiving device according to the present invention is, for example, used by converting and compressing a KS5601 (KS Hangul complete type) code into a 12-bit hexadecimal code.

The two ways to handle numeric and text messages are described below.

As a first method, the message data of a general pager and the Hangul code of the present invention (3 nibbles (start code (eg, "#") to distinguish between them) are used. One DTMF signal is processed as one number, and if there is a start code at the beginning of the received data string, subsequent DTMF signals are grouped into three and processed as one Korean code. As shown in FIG. 2 (b), a method of giving a message as “Lee Jeong Hyo No. 112” by calling “728-4650” may be represented as a schematic diagram of FIG.

On the other hand, as a second method, if all characters are converted to 3 nibble hexadecimal codes and all numbers are processed to 1 nibble hexadecimal code, when the 1 nibble start code indicating that the message is started is input, all subsequent characters are 3 nibbles. When the number is input again, the 3 nibble start code is entered to indicate the start of the number and is processed as a 1 nibble hexadecimal code. The binary code will automatically enter to indicate that it is a character input. For example, a method of calling " 728-4650 " and giving the message " Lee Jung Hyo 112 " can be represented as a schematic diagram of FIG.

Next, an operation of the text transceiver according to the present invention will be described with reference to the accompanying drawings.

When the message is first transmitted, when the other party's telephone number is inputted through the keypad 9 configured as shown in FIG. 6, the microprocessor 4 issues a read command through the read-only bus RD of the ROM 6, and the respective data. Read the code value corresponding to from ROM (6), store the telephone number data value in RAM (5), press message input key (for example, "#") and input message, then microprocessor 4 will enter the keypad. The code corresponding to the message data received from (9) is read from the ROM 6 and stored in the RAM 5 as a 12-bit Hangul completion code. Then, a write command is issued through the write-only bus WR of the LCD module 7 to display data on the LCD.

When the message input is completed and the transmission key of the keypad 9 is pressed (ie receiving a transmission command from the keypad 9), the microprocessor 4 outputs the telephone number stored in the RAM 5 to the tone generator 8, The tone signal converted into the DTMF signal by the tone generator 8 becomes a voice tone signal through the speaker 10, is input through the telephone's handset, and is recognized as the telephone number of the electronic telephone in the telephone network. .

When the communication is connected to the other party having the text transceiver, and the transmission key is pressed again, the microprocessor 4 outputs the message data stored in the RAM 5 to the tone generator 8, converts the message data into a DTMF signal, and converts the speaker 10 into a speaker 10. It transmits to the other party's text transceiver through the telephone handset and the telephone network.

As shown in FIG. 7, the message signal received through the antenna 1 of the text transceiver is an RF signal, demodulated and decoded through the receiver 2, and reproduced as a POCSAG signal.

The decoder 3 notifies the presence of the message data via the interrupt bus INTERUPT, and the microprocessor 4 issues a read command via the read-only bus RD and corresponds to each code of the received POCSAG signal data. The characters are accessed from the ROM 6 and stored in the RAM 5 via the data bus DATA and simultaneously displayed as messages on the LCD module 7.

If the microprocessor 4 of the text transmitting / receiving apparatus of the present invention has the function of a conventional electronic notebook, it can be used more conveniently. For example, if you enter the name and number in advance and enter the name of the other party first and then enter the message later, you can find the number separately and send the message directly to the other party without having to press the phone dial. do.

As a specific embodiment of the process of transmitting and receiving a text message to the other party using the text transmitting and receiving device of the present invention, a case of sending and receiving a text message of "Come to the office" to the other party "Kim Chul-soo" to the text transmitting / receiving device is an example. For example:

First, enter the name of the other party "Kim Chul-soo" by using the keypad 9 shown in FIG. 6 and press the message input function key to find the number of "Kim Chul-soo" like the function of a normal electronic notebook. The code value is entered into the RAM 5 first, and then the message content "Come to the office quickly" is entered on the keypad 9 and the code value (shown in FIG. 5) of the text message is entered into the RAM 5. do.

Next, pick up the phone, put the speaker 10 on the talker, press the transmit key, perform the automatic dialing function of the organizer and make a call to the text transceiver of "0127542243". When the connection is established, press the transmit key again, " The code values shown in FIG. 5 corresponding to "come to the office as soon as possible" are converted into DTMF signals and transmitted to the other party via the telephone.

The message data received through the antenna of the other party's transceiver is demodulated and decoded by the receiver 2, reproduced as a POCSAG signal, stored in the RAM 5 with the code value shown in FIG. 5, and simultaneously viewed by the other party. Module 7 will display a text message, "Come back to the office."

FIG. 2A shows an example of storing necessary codes by dividing each memory area in the ROM 6, where “000 to 05F” are control codes of a transceiver, “060 to 4DF” are KS5601 character codes, "4EO-5FF" represents the defined character code of the text transceiver, and "600-FBF" represents the KS5601 character code, respectively.

As described above, the text transmitting and receiving apparatus according to the present invention is an excellent invention that can transmit and receive a message as well as a number as well as a message without restriction to the other party. The present invention is not limited to this, and if the electronic organizer function and the electronic dictionary function are added, the application range of the present invention can be broadened as a multi-use transceiver which can be used more efficiently.

Claims (2)

An antenna 1 for receiving a paging signal; A receiver 2 for demodulating and decoding the paging signal received from the antenna 1, reproducing it as a POCSAG signal, and outputting it to the microprocessor 4; A keypad 9 having a transmission key for inputting letters and numbers; RAM 5 for storing inputted numeric and text message data; A ROM 6 for storing a control program and a character code system; A tone generator 8 for converting the inputted telephone number and message data into a DTMF signal and outputting the same to the speaker 10; A speaker 10 for outputting DTMF tones to the talker of the telephone; An LCD module 7 for displaying a received or sent message; And a microprocessor (4) for controlling the entire circuit, the microprocessor (4), when transmitting, receives a telephone number (relative number) and message data input through a keypad (9) and a corresponding code value. Reads from the ROM 6 and stores it in the RAM 5 and displays it on the LCD module 7. After the telephone number and message input are completed, the transfer key of the keypad 9 is pressed to receive the transfer command. ), Access the telephone number data stored in the device, convert the DTMF signal through the tone generator 8, make a phone call by automatically dialing the other party's transceiver through the speaker 10 through the speaker 10, and make a call. When the transmission key of 9) is pressed again, the text message data stored in the RAM 5 is accessed, converted into a DTMF signal by the tone generator 8, and then through the telephone and telephone network through the speaker 10. When the message data is received through the antenna 1 at the time of reception, each character corresponding to the POCSAG signal data reproduced through the receiver 2 is accessed from the ROM 6 to access the RAM ( 5) and a text transmitting / receiving device, characterized in that the message is displayed on the LCD module (7). The text transmitting / receiving apparatus according to claim 1, wherein the microprocessor (4) is configured to also have an electronic organizer and an electronic dictionary function.