KR100240280B1 - Data communication method using cordless telephone - Google Patents

Abstract

The present invention relates to a call-only phone, and more particularly, to a data communication method using a call-only phone that enables data communication in addition to voice communication with a desired counterpart.

Conventional outgoing-only telephones use a conventional PSTN network through a base station, but can only make a voice call with the other party, and connect a personal computer and a modem, thereby preventing data communication with the other party.

The present invention connects a personal computer and a modem to an outgoing telephone, and enables data communication as well as voice communication with the other party through a PSTN network, thereby connecting to a BBS (Bulletin Board System) or an ISP (Internet Service Provider). You can get services.

Description

Data communication method using outgoing phone

The present invention relates to a call-only phone, and more particularly, to a data communication method using a call-only phone that enables data communication in addition to voice communication with a desired counterpart.

In general, a call-only phone is a call-only phone with a limited use location, also called CT-2. CT-2 service, the first step of personal mobile communication service, is a small portable terminal that connects a wireless base station and an existing public telephone network while making a call in a public place in a city. This technology complements the shortcomings of CT-1, the current wireless telephone service used indoors due to limited use distance, and is a voice communication terminal using a frequency of 910MHz band in Korea. Incoming call is not serviced by current protocol and can be used only for origination. The basic network configuration of outgoing dedicated telephone is based on the existing public switched telephone network (PSTN) for establishing, maintaining and releasing communication links or channels between terminals. In other words, it goes through two communication links, the first is the link between the calling-only phone and the base station, and the other is the PSTN link connecting the base station and the other phone. A link with the base station is established and connected to the PSTN network so that the call can be made with the receiver. As shown in FIG. 1, the call-only phone is provided with an analog interface unit 10, an ADPCM codec 20, a time division duplex unit 30, a signal modulator 40, an RF module 50, and an LCD unit. 60, a keypad 70, a main controller 80, a microphone MIC, and a speaker SPK. Operation of the call-only phone 100 configured as described above, first, when the user enters the telephone number of the receiver through the keypad unit 70, the main control unit 80 establishes and maintains a wireless channel with the base station Through the PSTN, a signal is sent and received so as not to interrupt continuous communication with the receiver. In addition, the analog voice data of the caller input from the microphone (MIC) is converted into a sampling and digital signal through an analog interface unit 10 and an ADPCM codec 20, and is converted into a 32 kbps Adaptive Differentail Pulse Code Modulation (ADPCM) binary packet. The converted packet is time-division multiplexed under the control of the time division duplex unit 30, modulated by FSK (Frequent Shift Keying) in the signal modulator 40, and then through the RF module 50. The radio channel is transmitted to the base station through a 910MHz band channel. In addition, the digital 32kbps ADPCM voice data of the counterpart received from the base station is converted into its reverse process and output through the speaker SPK, so that the user can listen to the counterpart's voice.

On the other hand, the modem is generally used for data communication of a personal computer, the configuration as shown in Figure 2 of the accompanying drawings, the interface with the personal computer 110 is mainly built-in ISA and serial external method, each interface standard Performs data transmission and control for bidirectional data communication. The digital signal processing unit 230 performs processing for correcting errors and problems that may occur when transmitting digital data transmitted from the personal computer 110 to the PSTN network. This is done in accordance with standards established by the CCITT. The signal converter 220 converts the digital data processed and applied from the digital signal processor 230 into analog data for transmission to the analog channel PSTN network.

As described above, the conventional outgoing-only phone uses a conventional PSTN network through a base station, but only a voice call is possible with the other party, and a personal computer and a modem are connected to each other so that data communication with the other party is not possible. have.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and connects a personal computer and a modem to a call-only phone, and provides data using a call-only phone that enables data communication as well as voice communication with the other party through a PSTN network. An object of the present invention is to provide a communication method.

In order to achieve the above object, the present invention provides a data communication method using an outgoing telephone, comprising: an analog connection method capable of transmitting / receiving data by matching a signal conversion unit of a modem and an analog interface of the outgoing telephone; It is characterized by including.

On the other hand, in a data communication method using a telephone for exclusive use of a dial-in telephone, digital data applied from a digital signal processor of a modem is converted into ADPCM data and applied to the time-division duplex of a telephone for exclusive use of the telephone, and is applied from the time-division duplex of the telephone for exclusive transmission. It is characterized in that it comprises a digital connection method capable of transceiving data by converting ADPCM data into digital data that conforms to the protocol of the modem and applying it to the digital signal processing unit of the modem.

1 is a block diagram of a typical outgoing call-only phone.

2 is a block diagram of a general modem.

3 is a conceptual diagram of the connection of the call-only phone according to an embodiment of the present invention.

4 is a data communication method using an outgoing telephone according to the present invention;

Example of analog connection.

5 is a data communication method using a call-only phone according to the present invention.

It is an illustration of digital connection.

Explanation of symbols on the main parts of the drawings

10: analog interface unit 20: ADPCM codec

30: time division duplex unit 40: signal modulator

50: RF module 60: LCD

70: keypad 80: main controller

90: ADPCM unit 100: call-only phone

110: personal computer 200: modem

210: hybrid circuit 220: signal conversion unit

230: digital signal processing unit 240: interface unit

250: storage device 300: base station

MIC: Microphone SPK: Speaker

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the data communication method using the call-only phone according to the present invention, the call-only phone is shown in FIG. 1, the analog interface unit 10, the ADPCM codec 20, the time division duplex unit 30, and the signal. Modulator 40, RF module 50, LCD 60, keypad 70, main controller 80, a microphone (MIC) and a speaker (SPK) is provided. The analog interface unit 10 matches the microphone (MIC) and the speaker (SPK) with the ADPCM codec 20, and the ADPCM codec 20 compresses analog voice data input from the user into sampling and ADPCM data to time-division duplex. Output to the unit 30. The time division duplex unit 30 time-division multiplexes the ADPCM data applied from the ADPCM codec 20 and outputs it to the signal modulator 40, and the signal modulator 40 uses the FSK modulation to RF the radio channel at 910 MHz. The module 50 transmits to the base station. The LCD unit 60 displays the information during operation of the call-only phone 100 so that the user can recognize it, and the keypad unit 70 can input data such as a phone number. The main control unit 80 controls the overall operation of the call-only telephone 100, establishes and maintains a radio channel with the base station, and controls to facilitate communication with the other party.

Meanwhile, a modem is generally used for data communication of a personal computer, and as shown in FIG. 2, the hybrid circuit 210, the signal converter 220, the digital signal processor 230, and the interface 240 are provided. And the memory device 250, the hybrid circuit 210 matches and outputs four signals applied from the signal converter 220 into two signals corresponding to the PSTN, and the signal converter 220 Converts the digital signal applied from the digital signal processor 230 into an analog signal and outputs the analog signal to the hybrid circuit 210, or, conversely, converts the analog signal applied from the hybrid circuit 210 into a digital signal and converts the analog signal into a digital signal. To 230). The digital signal processing unit 230 performs processing for correcting errors and problems that may occur when transmitting digital data transmitted from the personal computer 110 to the PSTN network. The interface unit 240 generally includes an ISA built-in method and a serial external method, and performs data transmission and control for bidirectional data communication in accordance with each interface standard. The memory 250 stores data and protocols necessary for the operation of the modem.

Referring to the operation of the present invention in the call-only telephone and modem configured as described above are as follows.

First, as shown in FIG. 3, the present invention connects the call-only phone 100 and the modem 200, and the modem 200 is connected to the personal computer 110 again. According to the communication program of), the generated data is applied to the call-only phone 100 through the modem 200, the data is transmitted and received through the communication between the call-only phone 100 and the base station 300, the base station The 300 is connected to the PSTN network like a general telephone to transmit / receive data, thereby receiving a desired communication service. At this time, the connection between the personal computer 110 and the modem 200 is the same as the conventional method, and the connection between the call-only telephone 100 and the base station 300 and the PSTN network is the same as the existing method. Therefore, in order to perform data communication using the call-only phone 100 according to the present invention, a connection between the call-only phone 100 and the modem 200 is required, which includes an analog connection method and a digital connection method.

First, the analog connection method will be described with reference to FIG. 4. The signal conversion unit 220 of the modem 200 converts the digital data processed by the digital signal processing unit 230 into an analog signal suitable for a PSTN network and outputs the same. After matching to two signals in the hybrid circuit 210 to match the line, this signal is connected to the PSTN network. In addition, the call-only phone 100 is provided with an analog interface unit 10 for input and output of a voice signal, the input and output signals of the same properties as the signal input and output from the signal conversion unit 220 of the modem 200. Therefore, by directly matching the signal conversion unit 220 of the modem 200 and the analog interface unit 10 of the call-only telephone 100, data can be transmitted / received. Alternatively, the hybrid circuit 210 may be provided at the output terminal of the analog interface unit 10 of the call-only phone 100 and connected to the hybrid circuit 210 of the modem 200 to transmit / receive data. .

On the other hand, the digital connection method, as shown in Figure 5 attached to the digital signal processing unit 230 of the modem 200, the ADPCM unit 90 is provided in the call-only phone 100 Via this, it is a method which enables data communication by applying to the time division duplex part 30. FIG. First, two digital / analog signal conversions are performed until data from the personal computer 110 is connected to the counterpart's computer, and first, the digital data from the sender's personal computer is received through the PSTN network. Conversion into analog data for transmission to the side, and second, conversion to analog data applied through the PSTN network into digital data for the receiver's computer to receive. Therefore, data communication is possible by directly applying the digital data output from the digital signal processor 230 of the modem 200 to the time division duplex unit 30 of the telephone 100 for transmission. At this time, since the data output from the digital signal processing unit 230 of the modem 200 is not data converted into ADPCM data, when it is directly applied to the time division duplex unit 30 of the call-only phone 100, Since the base station 300 receives this signal and generates a signal that is completely different from the original signal, it is provided from the digital signal processing unit 230 of the modem 200 by providing the ADPCM unit 90 in the call-only telephone 100. After converting the digital data into the same form as the ADPCM data used in the call-only phone 100, it should be applied to the time division duplex unit 30. Since the ADPCM conversion can be implemented in software, the ADPCM unit 90 of the call-only phone 100 is removed, and the ADPCM conversion routine is included in the digital signal processing unit 230 of the modem 200 for conversion. You can.

As described above, in the analog method, the analog interface unit 10 of the telephone 100 dedicated to transmitting the signal converted by the modem 200 into an analog signal for transmitting the digital signal from the personal computer 110 to the PSTN network. By transmitting to the PSTN network through the outgoing call phone 100, the digital method converts the digital data from the personal computer 110 to the analog signal in the modem 200 before converting it into an analog signal. After approving to the time division duplex unit 30 of 100, and transmitting to the PSTN network through the call-only phone 100, the user through the personal computer 110, modem 200 and call-only phone 100 Data communication with the other party becomes possible.

As described above, the present invention connects a personal computer and a modem to an outgoing telephone, and enables data communication as well as voice communication with the other party through a PSTN network, thereby enabling a Bulletin Board System (BBS) or an Internet Service Provider (ISP). ), You can get the service you want.

Claims (1)

In the data communication method using the telephone for exclusive use of the telephone, the digital data processing unit 230 of the modem 200 is converted into ADPCM data and applied to the time division duplex unit 30 of the telephone 100 for transmission. By converting the ADPCM data applied from the time division duplex unit 30 of the outgoing call-only phone 100 into digital data conforming to the protocol of the modem 200, the digital signal processing unit 230 of the modem 200 is applied. And a digital connection between the modem (200) and the call-only phone (100) to transmit and receive data.

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