KR19990016768A - Text Information Service Method Using DTF in Phone - Google Patents

Abstract

The present invention relates to a method of transmitting and receiving a number and various characters using a DTMF (Dual Tone Multi-Frequency) signal used when dialing a telephone. In order to solve this problem, the present invention is a text information service method for transmitting and receiving text as a DTMF signal without using a modem by using a key combination according to the frequency number of DTMF. In the text information service method using a DTMF signal in the telephone according to the present invention, a process of forming a DTMF conversion table by specifying a number and a letter with two key combinations, and the key for the specified number or letter A transmission process of continuously transmitting two digits of the DFM signal corresponding to the key input upon input, and a DMF signal received from the conversion table when two digits of the DTMP signal are continuously received. Characterized in that the reception process to convert the display to numbers and characters.

Description

Text Information Service Method Using DTF in Phone

The present invention relates to a text information service of a telephone, and more particularly, to a method of serving text information using a DTMF signal.

Conventionally, in order to transmit a text using a terminal, the text was transmitted using a telephone line using a modem. However, it is expensive to install a modem in the terminal, and thus, the terminal is expensive.

As described above, when a modem is used to transmit text using a terminal, there is a problem of an increase in terminal cost due to a modem value.

In order to solve the above problems, an object of the present invention is a method of transmitting a text using a terminal using DTMF in a phone that can be used inexpensively by using a DTMF signal used when dialing a phone without using a modem. The present invention provides a text information service method.

In order to achieve the above object, the present invention provides a character information service method using a DTMF signal in a telephone, comprising the steps of: forming a DTMF conversion table by designating a number and a letter with two key combinations; (B) a transmission process of continuously transmitting a 2 digit DMP signal corresponding to the key input when a key is input for a character; and a DTM received from the conversion table when a 2 digit DMP signal is continuously received. It is characterized in that the reception process of converting and displaying the number and letters corresponding to the F signal.

1 is a block diagram of a telephone according to the present invention

2 is a diagram illustrating a DTMF conversion table formed by registering numbers and characters with matrix combinations of 16 complex frequencies of DTMF according to an embodiment of the present invention.

3 is a frequency waveform diagram showing DTMF signal transmission for performing a text information service according to an embodiment of the present invention.

4 is a control flowchart of a text information service for transmitting numbers and letters as DTMF signals according to an embodiment of the present invention.

5 is a control flowchart for converting a received DTMF signal into numbers and letters according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention, such as specific processing flows. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. Detailed descriptions of well-known functions and configurations that are determined to unnecessarily obscure the subject matter of the present invention will be omitted.

1 is a block diagram of a telephone according to the present invention,

The controller 10 controls the overall operation of the phone, and controls the DTMF transmitter 20 and the DTMF receiver 18 when transmitting and receiving text using the DTMF according to the present invention, and transmits and receives a DTMF signal corresponding to the text through a telephone line during a call, and key data. When is input, the character corresponding to the input key data is read and displayed. When a key signal is input from the key input unit 28, a DTMF signal corresponding to the key signal is transmitted to the telephone line. The hook switch 12 includes a hook relay and performs a function of connecting and disconnecting the telephone line and the call circuit unit 14 under the control of the controller 10. Under the control of the control unit 10, the call circuit unit 14 distributes and transmits a voice signal and various key data inputted from the telephone line to a corresponding component. In addition, the call circuit 14 transmits a DTMF signal corresponding to the outgoing key data provided from the DTMF transmitter 20 to the telephone line. The handset unit 16 converts a voice signal input through the handset to an electrical signal for a telephone call and transmits it to the call circuit unit 14, and the handset converts an electrical signal input through the call circuit unit 14 into a voice signal and outputs the voice signal. The DTMF receiver 18 receives the DTMF signal received from the call circuit 14, converts the DTMF signal into digital data, and applies it to the controller 10. In addition, the DTMF receiver 18 converts the DTMF signal corresponding to the character received from the other party during the telephone call into digital data and provides the converted data to the controller 10. The DTMF transmitter 20 is connected between the call circuit 14 and the controller 10, converts the key data output from the controller 10 into a DTMF signal, and transmits the DTMF signal to the call circuit 14. The VOX circuit 22 is connected in parallel between the call circuit 14 and the handset 16, and detects a ring signal input through the phone line and provides it to the controller. The memory 26 stores a function table for servicing various functions provided by the telephone. In particular, the memory 26 stores a DTMF conversion table in which numbers and letters are designated by two key combinations according to the present invention. The key input unit 28 includes various function keys, numeric keys, and a character mode key according to the present invention, and applies a key signal generated according to the key operation to the controller 10. The display unit 30 displays data provided from the controller 10, and displays characters read from the memory 26 under the control of the controller 10.

FIG. 2 is a diagram illustrating a DTMF conversion table in which numbers and letters are registered as matrix combinations of 16 complex frequencies of DTMF according to an embodiment of the present invention, and 256 matrix combinations of 16 complex frequencies included in the DTMF are shown in FIG. A DTMF conversion table is shown in which various characters are registered at different table positions. Since the DTMF conversion table has 256 cases, the DTMF conversion table is sufficient to register and use various other characters including 26 English alphabets, 32 Korean consonants + vowels. For example, [A] is the table position (1,1) and [a] is the table position (3,1).

3 is a frequency waveform diagram showing DTMF signal transmission for performing a text information service according to an embodiment of the present invention.

At the time of character transmission, DTMF signal of 2 digits is continuous for each character, and the characters are distinguished from each other by a difference at regular time intervals. When the DTMF signals corresponding to the letters [A] and [B] registered in the DTMF conversion table are transmitted as shown in the example of FIG. 3, the frequency waveform diagrams transmitted are (1,1) and DTMF signals of the letter [A]. In transmitting (1,2), which is the DTMF signal of the letter [B], as shown, DTMF frequency signals corresponding to (1,1) of the two digits representing the letter [A] are continuously transmitted, and again the character [ When transmitting DTMF frequency signal corresponding to (1,2) of 2 digits indicating B], the next transmission is performed at a predetermined time interval (100mS) so as to be distinguished from the 2 digit signal of the letter [A]. Transmit DTMF signal of (1,2) which is 2 digit signal of. In this way, one character is continuously transmitted as a two-digit DTMF signal, and a signal is transmitted with a certain time interval between the characters so as to distinguish between the characters.

4 is a control flowchart of a text information service for transmitting numbers and letters as DTMF signals according to an embodiment of the present invention.

Checking the character key signal input when the character mode is set;

Searching for a corresponding DTMF signal in a conversion table for a character corresponding to the input key signal when the character key signal is input;

The DTMF signal is searched continuously for two digits.

5 is a control flowchart for converting a received DTMF signal into numbers and letters according to an embodiment of the present invention.

Detecting a DTMF signal according to text transmission after receiving a call signal and searching for a character corresponding to the received DTMF signal in a conversion table;

And displaying each character corresponding to the searched DTMF signal on the display unit.

One preferred embodiment will be described in detail with reference to FIGS. 1 to 5 described above.

In order to transmit a character using a DTMF signal in a telephone period, a conversion table based on a matrix combination of each frequency of the DTMF must first be configured in a memory. Such a DTMF conversion table configuration is shown in FIG. When 16 signals, which are the number of complex frequency signals, are combined into a matrix, the number of 256 cases is generated, and various characters are registered in the number of places of the generated 256 cases. The 3 * 4 key and the function keys of the telephone are used to form 16 signals, the number of DTMF composite frequency signals. For example, 16 keys are formed using 12 keys of 3 * 4 keys and A, B, C, and D keys. As described above, since English requires only 26 table letters in English and 32 consonants + vowels in Korean, the 256 table seats are quite large and are sufficient to register letters and special characters from around the world. In this way, various characters are registered in the conversion table in order to transmit the DTMF signal, and each position is represented as (1,3 because each table digit is a matrix combination of 16 DTMF signals). ), And the DTMF frequency waveform diagram to be transmitted to (2, such as (3, 6)) is shown in FIG. In order to distinguish between the characters, a certain time interval (for example, 100 mS) is provided between characters, and when transmitting two-digit DTMF signals, which are character units, DTMF signals are continuously transmitted to form one character. If the transmission table and the transmission method of DTMF signals corresponding to the characters are set in this way, the transmission and reception of the telephone period can be performed. First, the method of transmitting the characters will be described with reference to FIG. First, in step 101, the controller 10 checks whether the user inputs a specific key signal for a text mode while talking to the other party. The specific key for the character mode may be formed and operated independently of the character mode key, or may be formed and operated by a key combination. If it is detected that the key signal indicating the character mode is input through the key input unit 28, the controller 10 proceeds to step 103, and if not detected, proceeds to step 102 to perform a corresponding function. When the key signal indicating the character mode is input through the key input unit 28 in step 104, the controller 10 checks whether the character key signal is input. For example, to send the character that the password is 1052, 3,8,3, C, 3,5,3, B, 4,3,3,2,4,7,3,2,1,0 Suppose you have a keystroke of, 5,2,3,8,4,8,3,6,3,2,4,8,3,3,3, C. Here, the key combination for each letter is ㅇ (3,8), ㅏ is (3, C), ㅁ is (3,5), ㅎ is (3, B), ㅗ is (4,3), b Is (3,2), ㅡ is (4,7), b is (3,2), 1 is (0,1), 0 is (0,0), 5 is (0,5), 2 is ( 0,2), (3,8), (4,8), (3,6), (3,2), (3,2), (4,8), c (3) And) becomes (3, C). When the user inputs a key corresponding to a specific character registered in the conversion table, the control unit 10 retrieves the character corresponding to the key signal input by the user from the DTMF conversion table of the memory 26 in step 2 digits in step 104. At this time, the display unit 30 displays a character corresponding to the key signal input by the user so as to confirm whether the user inputs correctly. Then, in step 105, the control unit 10 transmits the DTMF signal corresponding to each character through the DTMF transmitter 20 to the telephone line through the call circuit unit 14 in units of 2 digits. The text transmission DTMF signal transmitted as described above is transmitted in the same manner as in FIG. 3. In this case, a method of receiving, converting, and displaying a DTMF signal transmitted from a transmitting side into a character in the receiving telephone will be described with reference to FIG. 5. When the call signal is received in step 201, the controller 10 controls to perform a call mode when the user hooks off in response to the call signal. Then, in step 202, the controller 10 proceeds to step 204 when a specific key signal for notifying the character transmission is received, otherwise proceeds to step 203 to perform the corresponding function. In step 204, the controller 10 checks whether the DTMF signal corresponding to the text transmission is received through the DTMF receiver 18. At this time, the received DTMF signals are continuously received with a time difference of 2 digit units. When the DTMF signal is received, the process proceeds to step 205. In step 205, the controller 10 searches for a conversion table in the memory 26 to convert the character corresponding to the received DTMF signal into the corresponding character. 3, 8, 3, C, 3, 5, 3, B, 4, 3, 3, 2, 4, 7, 3, 2, 1, 0, When a DTMF signal of 5,2,3,8,4,8,3,6,3,2,4,8,3,3,3, C is received, the controller 10 receives the received DTMF signal in units of 2 digits. Search for the corresponding character in the conversion table. In operation 206, the controller controls the display unit 30 to display that the encrypted text message, which is the read text message, is 1052.

As in the above example, when various characters are registered in the memory of the telephone by 16 matrix combinations (the number of 256 cases), which is the number of complex frequencies of DTMF, when the call is noisy or noisy If you do not have a situation to make a phone call using the DTMF various characters (including Korean, English, Japanese and various special keys) can be transmitted and received through the telephone line without a separate device.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention provides a text information service method using DMP in a telephone. When various characters are registered by 16 matrix combinations of DTMF complex frequencies in the memory of the telephone, the surroundings are noisy during a call. When the situation is difficult to make a phone call or make a sound, it is possible to transmit and receive various characters (including Korean, English, Japanese and various special keys) using the DTMF without a separate device through a telephone line.

Claims (5)

In the phone, Forming a DTMF conversion table by specifying characters using two key combinations; A transmission process of continuously transmitting a character transmission corresponding to the key input as a 2 digit DMP signal when a key is input for the specified character; Character information service using DFM in a telephone comprising a receiving process of converting and displaying a character corresponding to a DFM signal received in the conversion table when two digit DFM signals are continuously received. Way. The method of claim 1, The conversion table is formed by forming 16 tables corresponding to the number of DFM composite frequencies in a matrix to make 256 tables, and then registering each table by specifying a number and a letter. Character information service method using f. The method of claim 1, And a time difference between the two digits of the DM signals transmitted to distinguish the numbers and letters. In the phone, Forming a table by arranging a plurality of keys in a matrix and assigning a number and a letter to each table matrix to form a DMP conversion table; Inputting a predetermined key for the specified number or character when setting the character mode; A sending process of continuously transmitting a matrix corresponding to each of the character keys to be input as a 2-digit DFM signal; Receiving process of reading the received DFM signals by two digits when the DFM signals are continuously received, converted into characters corresponding to the two digit DFM signals received by the DFM table, and displaying the received characters. Character information service method using the DTP in the telephone, characterized in that consisting of. The method of claim 4, wherein And a time difference between the two digits of the DT signals transmitted continuously to distinguish the numbers and letters.