KR20060129760A - Method for transmitting a communication number by using dtmf of the mobile communication terminal while talking over the telephone - Google Patents

Abstract

A method for transmitting a phone number during a call by using a DTMF in a mobile communication terminal is provided to enable a mobile communication terminal of a calling party to transmit a DTMF signal corresponding to a selected phone number by inputting a key or selecting phone number transmission in a phone book and enabling a mobile communication terminal of a called party to receive the DTMF signal and store phone number data by associating the phone book. A method for transmitting a phone number during a call by using a DTMF(Dual Tone Multi Frequency) in a mobile communication terminal comprises the following steps of: inputting a key in the mobile communication terminal of a calling party and selecting phone number transmission in a phone book, and converting the inputted phone number data into DTMF data, and storing the converted data(S1,S2); checking a cipher of the DTMF data corresponding to the phone number and encrypting the DTMF data by cryptographic algorithms of a public key method if the cipher of DTMF data is the same as a cipher of a specific portable phone number or greater than that, and transmitting the encrypted DTMF data from the mobile communication terminal of the calling party to the mobile communication terminal of a called party(S3~S5); and receiving and decoding the DTMF data, encrypted in the mobile communication terminal of the calling party, and inversely converting the DTMF data, and reading phone number data(S6).

Description

Method for transmitting a communication number by using DTMF of the mobile communication terminal while talking over the telephone}

1 shows a layout of a conventional DTMF touch-tone keypad.

2 is a block diagram of a digital oscillator for DTMF tone generation.

3 is a band pass filter through which DTMF component frequencies pass.

4 is a flowchart illustrating a method for transmitting and receiving a number during a call using DTMF in the mobile communication terminal according to the present invention.

The present invention relates to a method for transmitting / receiving a number during a call using DTMF in a mobile communication terminal. In particular, when a number needs to be transmitted between two user terminals, a keyboard input is transmitted from an SMS message or voice. Alternatively, after searching for a number in the phone book, the user selects the number transmission to transmit a DTMF signal corresponding to the selected number (the pressed number), and the receiving side receives the received DTMF signal and stores it in the terminal transmitted in association with the phone book. The present invention relates to a method for transmitting and receiving a number during a call using DTMF.

In general, dual tone multi frequency (DTMF) is a signal that is generated when a button on a regular telephone is pressed and sent to a telephone company. In the United States and many other countries, this phone, which replaced the dial phone, is called a touchtone phone or an electronic phone. In a telephone with DTMF, each key of the telephone you press produces two notes with a specific frequency. Thus, one voice is a note belonging to a high frequency and the other is a note belonging to a low frequency so that the voice cannot mimic the note. The signals generated when the buttons on the touchtone phone are pressed are shown in the following table.

   text   One   2   3   4   5   6   7   8   9   0   *   # Low frequency (Hz)  697  697  697  770  770  770  852  852  852  941  941  941 High frequency (Hz) 1209 1336 1477 1209 1336 1477 1209 1336 1477 1336 1209 1477

Several companies produce microchips for sending and receiving DTMF signals.

TAPI provides a way for a program to detect DTMF signals. TAPI provides a standard interface for a program that allows users or computers to talk to people (or resources connected to the phone) from anywhere in the world through a telephone or video phone. Say.

* What is Dual Tone Multi Frequency (DTMF)?

DTMF is one of the signaling methods that are currently delivered to the telephone company to determine the other party in the ordinary telephone. In other words. Every time you press a button on your phone, you hear a beeping and ringing sound. In the human ear, you hear the same sound, but in reality, each button has its own sound (frequency; sound varies by frequency). have. In many countries, including Korea, this type of telephone is replaced by a touch-tone telephone or an electronic telephone. In DTMF-enabled telephones, when a user presses a button, two different frequencies corresponding to each button are generated. This type of telephone does not simply send and receive signals directly to the telephone station by a mechanical device inside the telephone, but uses a method of generating only sound and transmitting it to the telephone station through the telephone line. Therefore, it can be taken as a signal by human upbringing and external sound. In other words, if you can apply the appropriate sound to the handset, you can call the other party without pressing a button. Therefore, the use of two different specific frequencies is intended to prevent the device from behaving as if it is a normal signal by generating a sound corresponding to each button by noise or artificial manipulation. In addition, it is set to prevent harmonics between each frequency, thereby eliminating interference by other frequencies. The following figure shows the frequencies corresponding to each button. Actually, commercial products of mobile phones and landline phones do not use the frequency of 1633Hz.

1 is a view showing the layout of a conventional DTMF touch-tone keypad.

DTMF Concept

The implementation of dual tone multi-frequency (DTMF) is largely divided into two phases: synthesis and recognition. Synthesis involves generating two different frequencies corresponding to each button and then combining them into one, as described above. If you press the '9' button on your cell phone or phone, you will hear two sounds: 1477 Hz (high-freq.) And 852 Hz (low-freq.). 2 is a block diagram of a digital oscillator (Digital Oscillator) for generating DTMF tones these processes.

Recognition, on the other hand, separates the synthesized transmitted signal and finds out which button was pressed. Accordingly, a bandpass filter capable of passing each frequency is needed as shown in FIG. 3. That is, a specific frequency can be detected by making a filter corresponding to each frequency and passing the DTMF signal therethrough. For example, if the signal of button '9' is transmitted, only the 1477Hz and 852Hz filters below can detect the output signal.

A method of transmitting and receiving a specific phone number from a mobile terminal by a mobile phone user is to search a plurality of phone numbers through a phone number menu, convert a selected phone number message into an SMS, and send and receive an SMS message including a specific phone number. Managed the phone number by updating or registering a new phone number compared to the built-in phone number.

However, the conventional mobile communication terminal of the calling party has a necessity of having a memory when transmitting a number for another person by voice using a voice or SMS message transmission method to transmit and receive a specific phone number. There was a problem in that to transmit a short message (SMS) to transmit to the destination mobile terminal through the SMS server.

The present invention has been proposed to solve the problems of the prior art, and an object of the present invention is to transmit a number to be transmitted by SMS message or voice when a number of mobile communication terminals need to be transmitted between two users. Apart from i) keyboard input or ii) searching for a number in the phone book, select Send number to send DTMF signal corresponding to the selected number (pressed number), and the receiving side receives the received DTMF signal and transmits it in connection with the phone book. The present invention provides a method for transmitting / receiving a number during a call using DTMF in a mobile communication terminal.

In order to achieve the object of the present invention, the present invention comprises the first step of selecting the number input from the key input or the phone book in the calling mobile communication terminal, converting the stored telephone number data into DTMF digital data; If the number of digits of DTMF data corresponding to the telephone number is checked and equal to or greater than a specific number of mobile phone numbers (N), the encryption is performed by a public key encryption algorithm, and when a specific key is pressed, the caller receives a call from the calling mobile terminal. A second step of transmitting encrypted DTMF data to a side mobile communication terminal; And a third step of receiving and decrypting the encrypted DTMF data in the called-party mobile communication terminal and reading back telephone number data by reversely returning the DTMF data. Provides a method for transmitting and receiving a number during a call.

In addition, the present invention checks whether the read phone number data is the same as the data of the existing phone number list previously stored in the phone book after the third step, and if not the same, newly linked to the phone book in the phone number list. And storing the stored phone number data in association with the phone book if the read phone number data is identical to the existing phone number list.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the following examples are merely to illustrate the present invention is not limited to the contents of the present invention.

4 is a flowchart illustrating a method for transmitting and receiving a number during a call using DTMF in the mobile communication terminal according to the present invention.

When there is a need to transmit a number between two users, such as a camera phone, an IMT-2000 terminal, a PDA phone, a smart phone, and an MP3 music phone, in the conventional method of transmitting a number to be transmitted as a message or voice. After retrieving the number from the keyboard input or phone book, select Send number to transmit DTMF signal corresponding to the selected number (pressed number), and the receiving side receives the received DTMF signal and stores it in the transmitted terminal in association with the phone book. .

In the calling mobile terminal, key input or number transmission is selected from the phone book (step S1), and the input telephone number data is converted into DTMF digital data and stored (step S2).

If the number of digits of DTMF data corresponding to the telephone number is checked (step S3) and is equal to or larger than a specific number of mobile telephone numbers (N: N = 10, 011-273-xxxx), an encryption algorithm of a public key method. After encrypting (step S4), pressing a specific key of the key input unit of the terminal transmits the encrypted DTMF data from the calling mobile terminal to the called mobile terminal through the mobile communication network at the corresponding frequency ( Step S5).

After receiving and decrypting the encrypted DTMF data at the called-party mobile communication terminal, the telephone number data is read by reversely returning the DTMF data (step S6).

If the read telephone number data is the same as the telephone number data of the existing telephone number list previously stored in the phone book (step S7) and is not the same, the telephone number list is newly stored in the telephone number list in association with the phone book. (Step S8), if the read phone number data has the same phone number data in the existing phone number list, the mobile phone user confirms, deletes or updates it, and stores it in association with the phone book (step S9).

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art various modifications of the present invention without departing from the spirit and scope of the invention described in the claims below Or it may be modified.

As described above, in the mobile communication terminal according to the present invention, a method of transmitting / receiving a number during a call using DTMF is unnecessary when transmitting a number for another person by voice, and because the number is transmitted during a call, an SMS (short message) Omit the process to send the effect is convenient to use.

Claims (2)

A first step of selecting a key input or a number transmission from a phone book in the calling mobile terminal, converting the input telephone number data into DTMF digital data and storing the same; If the number of digits of DTMF data corresponding to the telephone number is checked and equal to or larger than the specific number of digits of the mobile phone number, the encryption is performed by a public key encryption algorithm, and then a specific key is pressed. Transmitting encrypted DTMF data to a terminal; And A third step of receiving and decrypting the encrypted DTMF data at the called-party mobile communication terminal and reading back telephone number data by reversely returning the DTMF data; Method of transmitting and receiving a number during a call using DTMF in a mobile communication terminal comprising a. The method of claim 1, After the third step, if the read phone number data is the same as the data of the existing phone number list previously stored in the phone book, and if it is not the same, the phone number list is newly stored in association with the phone book, and If the read phone number data includes the same phone number data in the existing phone number list, deleting or updating and storing the phone number data in association with the phone book during a call using DTMF in a mobile communication terminal. How to send and receive numbers.

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