KR20030028020A - Internet phone combined common telephone - Google Patents

Abstract

PURPOSE: An Internet phone combined with a general phone is provided to perform an international call or a long-distance call easily between a user connected to a general public network and another user connected to an Internet communication network. CONSTITUTION: A central processing unit(140) controls respective units of the Internet phone wholly. A ring sensing unit(130) is connected to telephone lines(T)(R) and the central processing unit(140), senses ring terminated from the telephone lines(T)(R) and provides a sensing signal illustrating ring cadence. A call circuit unit(100) is connected to the telephone lines(T)(R), the central processing unit(140) and a switching unit(150). The call circuit unit(100) modulates a transmission voice signal inputted from a speaker phone(170) and then transmits a modulated signal to the Internet communication network or a PSTN(Public Switched Telephone Network). The call circuit unit(100) also demodulates a voice signal received from the Internet communication network or the PSTN and then provides a demodulated signal to the switching unit(150). The switching unit(150) forms a transmission/reception channel between the call circuit unit(100) and the speaker phone(170) by the central processing unit(140).

Description

Internet phone combined with regular phone {INTERNET PHONE COMBINED COMMON TELEPHONE}

The present invention relates to an Internet telephony service, and more particularly, to an internet communication network which enables voice communication between subscribers of a general public telephone network without an Internet environment or between subscribers connected to the Internet communication network. The present invention relates to a general telephone combined internet phone linked with a public public telephone network.

In recent years, as the number of Internet users is rapidly increasing year by year, and the data transmission speed on the Internet is increasing, interest in Internet telephony, Internet fax, and Internet broadcasting is increasing. In particular, Internet telephony is costly less than a few ten percent compared to the existing telephone bill when making international calls, and thus, PC telecom operators, Internet service providers, and telephone providers provide Internet telephony services.

Examples of the configuration of a system that can use the Internet telephony service include a computer-to-computer connection, a computer-to-phone connection, and a telephone-to-phone connection.

In particular, in order to make a phone call using Internet Phone technology in a home, an IP is connected to an Internet Service Provider (ISP) using a Point to Point Protocol (PPP), which is a modem and Internet access software. By completing the preparation for the TCP / IP (Transmission Control Protocol / Internet Protocol) to be executed by assigning the (Internet Protocol) address, it is possible to connect to the other host for the voice call.

Subsequently, the computer user attempts to connect to the called party by running the Internet phone program, and when the other party answers, the voice trunk is opened to make a phone call. By the way, since the Internet phone technology between the computer and the computer according to the prior art makes a call between a computer that prepares devices such as an Internet phone program, a microphone, and a speaker for an internet call, both callers are simultaneously connected to the Internet. It is difficult to talk to the unspecified majority.

Moreover, if you do not have a computer, or if you are not familiar with how to use it, there is a difficulty in applying the technology of telephone call through an internet communication network.

On the other hand, the Internet phone technology between the phone and the phone is connected to the Internet phone gateway to the subscriber to the Internet phone gateway (PSTN: Public Switched Telephone Network), each Internet phone gateway is connected to each other through the Internet communication network The telephone system is adopted.

1 is a block diagram showing an Internet telephone according to the prior art. Referring to FIG. 1, a voice processing codec module 300 for transmitting and receiving an input voice signal to the Internet and controlling an internet phone call ROM 310 is shown which stores an operating program.

In addition, a signal processing module 320 and memory devices 310 and 315 for processing an application program interface (API) for an internet phone call according to an operating program stored in a ROM 310 are shown. .

The above-described ROM 310 may employ a flash memory, and may include a RISC SD315 315. The signal processing module 320 may use a digital signal processor (DSP) chip and is connected to the keypad I / O 330 and the RTOS debugger 340.

The voice processing codec module 300 may be composed of an analog / digital, digital / analog converter, PCM codec, voice codec, and packet processor block. The analog / digital converter or the digital / analog converter converts a voice signal input from the handset 350 or the microphone 370 of the telephone to a digital signal for transmission and reception, and converts the digital signal into an analog voice signal upon reception.

The PCM codec performs pulse code modulation (PCM) on the transmitted signal and performs PCM demodulation on the received signal. In addition, the voice codec (CODEC) performs a function of compressing the transmitted data and restoring the received data. The packet processor configures data to be transmitted into packet data that can be transmitted through an internet protocol, and restores the received packet data to a state before packet processing.

Such an internet telephone has a LAN interface 410 or 420 of 10 base T or 100 base T, is connected to each other through a LAN terminal 390, and is connected to a PC through a PC connection terminal 400. It may be used or may be used as a stand alone type.

However, the above-described conventional technology is a separate communication in that the user has to enter the telephone number of the called party again after accessing the Internet gateway through the general public telephone network, and uses the network of the general public telephone network and the gateway operator. There is a disadvantage to be charged.

Therefore, while recovering from the above-mentioned problems, it is possible to obtain a lower call rate in terms of call rate, and in terms of reliability, between the general subscribers who are not equipped with the Internet environment by interworking with the Internet communication network and the public network (PSTN). It is desirable to provide a general-purpose Internet phone for enabling an Internet phone call service.

Accordingly, it is an object of the present invention to provide a general telephone combined use internet phone that can easily carry out international and long distance telephone calls between a user connected to a general public network and a user connected to an internet communication network. The Internet phone is achieved by providing a telephone call service in connection with the Internet communication network and the public network (PSTN).

Other objects of the present invention will become more apparent from the following detailed description and the accompanying drawings.

1 is a block diagram showing an Internet Internet telephone according to the prior art,

Figure 2 is a block diagram showing an embodiment provided for the description of the general-purpose phone combined Internet phone according to the present invention.

<Explanation of symbols on main part of drawing>

100: call circuit unit 110: frequency shift telegraph unit

120: DTMF generating unit 130: ring detecting unit

140: central processing unit 150: switching unit

160: amplifier 170: speakerphone

180 memory unit 190 liquid crystal display unit

200: keypad

According to the Internet call system according to the present invention for achieving the above objects, in the Internet phone providing a telephone communication service between the client terminal connected to the Internet communication network or the public public telephone network (PSTN), (1) the Internet Ring detecting means for detecting a ring incoming from a telephone line connected to a communication network or a public telephone network and outputting a detection signal indicating a ring cadence; (2) a central processing unit for controlling the entire system according to the incoming call detection signal inputted from the ring detecting means and various function keys and numeric keys inputted from the keypad; (3) DTMF generating means for transmitting a DTMF signal corresponding to a dial digit under the control of said central processing unit to a telephone line; (4) a call circuit unit for demodulating and demodulating a voice signal transmitted and received for access to the Internet and a public public telephone network under the control of the central processing unit; (5) switching means for forming a transmission / reception call between the speaker circuit and the call circuit unit connected to the telephone line by the control of the central processing unit; And (6) liquid crystal display means for displaying various functions on the screen by the control of the CPU.

Optionally, when the telephone line is connected to an internet communication network, the frequency shift for shifting and transmitting the DTMF signal to a predetermined frequency may further include a telegraph unit.

Optionally, a long distance / international call discount button is installed in place of the keypad.

In this way, subscribers of general public telephone networks without Internet environment and service subscribers connected to the Internet communication network use the existing telephone company telephone numbers and telephone lines as they are, and make long distance and local telephones provided when making international and long distance calls. It can be seen that international and long distance telephone calls can be made by pressing the discount button for international calls.

As a result, intercommunication carriers will be connected to regular telephone lines for interworking with Internet-based communication networks, and intercity or international travel will be via the Internet communication network. There is an advantage to the number.

And, there may be a plurality of embodiments of the present invention, the following most preferred embodiments will be described in detail.

Through this preferred embodiment, the object of the present invention, other objects, features and advantages will become apparent from the following description with an embodiment according to the present invention in connection with the drawings shown for purposes of illustration.

Hereinafter, with reference to the accompanying drawings it will be described in detail a preferred embodiment of the general-purpose Internet phone according to the present invention.

Figure 2 is a block diagram showing an embodiment provided for the description of the general-purpose phone combined Internet phone according to the present invention.

As shown in FIG. 2, the ordinary telephone combined Internet phone according to the present embodiment detects a ring received from a telephone line T (R) connected to an Internet communication network or a public public telephone network (PSTN), thereby providing ring cadence. Ring detection unit 130 for outputting a detection signal indicating the cadence, keypad 200 for inputting various function keys and numeric keys, long-distance / international call discount key, incoming call input from the ring detection unit 130 The central processing unit 140 and the telephone line T which control the whole system of the telephone according to various function keys, numeric keys, and long distance / international telephone discount keys input from the detection signal and the keypad 200 are generally used. DTMF generation unit 120 for transmitting a DTMF (Dual Tone Multi-Frequency) signal according to dial digits under the control of central processing unit 140 when connected to a public telephone network, and telephone. When the line T (R) is connected to the Internet communication network, the DTMF generating unit 120 A frequency shift for shifting the generated DTMF signal to a predetermined frequency and transmitting the frequency shift keying (FSK) and the central processing unit 140 under control of the connection to an Internet communication network and a general public telephone network (PSTN) Call circuit unit 100 for demodulating and demodulating voice signals transmitted and received, and the call circuit unit 100 and speakerphone 170 connected to telephone line T (R) under the control of central processing unit 140. A switching unit 150 forming a transmission / reception call path, an amplification unit 160 connected between the speaker phone 170 and the switching unit 150 to amplify the transmission and reception voice signals to a sufficient size, a telephone number and various The memory unit 180 stores the function data, and the liquid crystal display unit 190 displays various functions on the screen under the control of the central processing unit 140.

Preferred embodiments of the present invention made as described above will be described in more detail with reference to FIG. 2.

Referring to Figure 2, the central processing unit 140 controls the overall part of the Internet phone combined with a general telephone.

The ring detecting unit 130 is connected between the telephone line (T) (R) and the central processing unit 140, and detects the ring coming from the telephone line (T) (R) to centrally process the detection signal indicating the ring cadence To the device 140. The call circuit unit 100 is connected between the telephone line T and the central processing unit 140 and the switching unit 150, and under the control of the central processing unit 140, an internet communication network and a general public telephone network (PSTN). In order to access the control unit, the voice signal modulated by the speakerphone 170 is modulated and transmitted to the Internet communication network or the public public telephone network (PSTN) through the telephone line (T), and the demodulated voice signal is demodulated from the switching unit ( 150). The switching unit 150 forms a transmission / reception communication path between the call circuit unit 100 and the speakerphone 170 under the control of the central processing unit 140. The received voice signal output from the switching unit 150 is amplified to a sufficient size in the amplifier 160 and then output to the speakerphone 170 controlled by the central processing unit 140. In addition, the transmission voice signal generated from the speakerphone 170 is provided to the call circuit unit 100 through the amplifier 160 and the switching unit 150. The memory unit 180 stores a program and various data for the operation of the CPU 140. The liquid crystal display 190 displays various functional states on the screen under the control of the central processing unit 140.

In this way, when the service subscriber uses the existing carrier's telephone number and the telephone line as it is and makes international and long distance calls, he / she presses the long distance / international call discount key provided on the keypad 200 and then presses the other party's number. In order to interwork with the Internet, regular telephone lines are connected to the main carrier switch, and intercity or international transit can be made through the Internet communication network.

On the other hand, as a comparative example, the conventional technology, that is, the inconvenience that the user has to enter the telephone number of the called party again after connecting to the Internet gateway through the public public telephone network, and the network of the public public telephone network and the gateway operator In contrast to this, the present invention is connected to the public public telephone network and the internet communication network to connect with or to the subscribers of the public public telephone network that is not equipped with the Internet environment. It can be seen that it is convenient to make phone calls with one subscriber.

In this result, according to the present invention, the intercommunication service provider switch over the general telephone line for interworking with the Internet-based communication network, and the inter-city or international movement is through the Internet communication network, so that the intercity or international charges are removed. The advantage is that you can call at the fare level.

In addition, although specific embodiments of the present invention have been described and illustrated above, it is obvious that the present invention may be variously modified and implemented by those skilled in the art.

Such modified embodiments should not be individually understood from the technical spirit or the prospect of the present invention, and such modified embodiments should fall within the appended claims of the present invention.

According to the general-purpose telephone of the general-purpose telephone of the present invention, which is apparent from the above description, the subscriber of the general public telephone network without the Internet environment and the service subscriber connected to the Internet communication network use the existing telecommunication company telephone number and the telephone line as they are. When making long-distance telephone calls, inter- and international travels are made through the Internet communication network, which makes it possible to make calls at the level of the local charges in which the inter-city or international fees are deleted.

Claims (3)

In an Internet phone providing a telephony service between client terminals connected to an Internet communication network or a public public telephone network (PSTN): (1) ring detecting means for detecting a ring incoming from a telephone line connected to the Internet communication network or a public telephone network and outputting a detection signal indicating a ring cadence; (2) a central processing unit for controlling the entire system according to the incoming call detection signal inputted from the ring detecting means and various function keys and numeric keys inputted from the keypad; (3) DTMF generating means for transmitting a DTMF signal corresponding to a dial digit under the control of said central processing unit to a telephone line; (4) a call circuit unit for demodulating and demodulating a voice signal transmitted and received for access to the Internet and a public public telephone network under the control of the central processing unit; And (5) Internet phone for general telephone use, characterized in that it comprises switching means for forming a transmission and reception call between the speaker circuit and the call circuit unit connected to the telephone line by the control of the central processing unit. The method according to claim 1, And a frequency shifter for shifting and transmitting the DTMF signal to a predetermined frequency when the telephone line is connected to an internet communication network. The method according to claim 1, The intercom / international phone discount key is installed in place of the keypad.