KR20010107284A - A Method of Internet Phone Telecommunication by Voice-file Sending and Receiving - Google Patents

Abstract

The present invention is to transmit and receive a voice file to maintain the basic call by storing and transmitting the phone voice as a file when the data quality of the Internet is low while the call quality is poor while making a phone call over the Internet The present invention relates to a method for making an internet telephony call by using a call quality determination process for determining the quality of a telephone voice transmitted through the internet through a computer or a caller's hearing during a real-time telephone call via the internet. The call mode switching process of switching the call mode according to the determination result, and if the call quality is poor, the voice file in which the phone call is continuously made by transmitting and outputting the file generated by storing the voice of the caller who switched the call mode to the other side. Phone calls, including transport calls And that is characterized.

Description

A method of Internet Phone Telecommunication by Voice-file Sending and Receiving}

The present invention relates to an internet telephony method, and in particular, during a telephone call over the internet, when the data transmission rate of the internet becomes low and the call quality deteriorates, the telephone call is stored as a file, and then the basic call continues. The present invention relates to an internet telephony call method for transmitting and receiving voice files.

In recent years, an internet phone that can make a phone call at a low price using the Internet has been developed and utilized. Internet telephones include a computer with a voice input / output device and a PC (Personal Computer) -to-PC method in which a computer makes a telephone call through the Internet, a PC-to-Phone method in which a telephone call is made through a computer and a general telephone. It is used as a phone-to-phone method through a telephone, and Internet telephones can lower call costs than telephones using a public switched telephone network (PSTN), compared to a public telephone network using a line transmission scheme. This is because the public Internet uses the method. The packet transmission method used in the public Internet does not use a specific line exclusively like the circuit transmission method. Instead, the data to be transmitted is divided into several packets and placed on the transmission line so that the packets reach the destination through the fastest path. As a method, a transmission line is mixed with packets sent by multiple users, and thus, multiple users can share a circuit at the same time, thereby providing a service at a lower price than a circuit transmission method having a monopoly.

However, the Internet phone using the packet transmission method has a problem in that a lot of data packets move through a single line, and thus, if there is a lot of traffic, there is a problem of transmission delay and loss, which degrades the call quality. . Due to this, there are many cases in which the call quality deteriorates during the phone call, so that the voice of the other party cannot be properly confirmed. When the contents of the phone call are important, the call quality of the Internet phone may be fatal in communication with each other.

Accordingly, the present invention has been made to solve the above problems, and the object of the present invention is to continue the doctor even when the phone call with the other party is poor because the call quality is poor while making a phone call via the Internet. It is to provide an internet telephony method that enables delivery.

In order to achieve the above object, the present invention provides a call quality determination process for determining the quality of telephone voice transmitted through the Internet by the computer or the caller during the real-time telephone call through the Internet. The call mode switching process of switching the call mode according to the quality discrimination result, and if the call quality is poor, the voice of the caller who switches the call mode is stored and the generated file is transmitted to the other side and outputted to make the phone call continuously. A telephone call is made, including a file transfer call process.

1 is a block diagram of an Internet telephony call system according to an embodiment of the present invention;

2 is a block diagram of the Internet phone server of the Internet phone call system according to an embodiment of the present invention;

3 is a flowchart illustrating a process of switching to an internet phone call method by transmitting and receiving a voice file according to poor call quality during a real-time internet phone call according to an embodiment of the present invention;

Figure 4a is a flow chart illustrating a process when the communication quality between the client in the real-time call mode is established by the communication line between the client through the Internet phone server in the PC-to-PC method according to an embodiment of the present invention ,

4B is a flowchart illustrating a process when a change in call quality occurs during a phone call in client A in real time call mode and client B in file transfer call mode in a PC-to-PC method;

FIG. 4C is a flowchart illustrating a process when an abnormality occurs in the call quality during a telephone call in the client-to-file transfer call mode and the client B to a real-time call mode in the PC-to-PC method.

FIG. 4D is a flowchart illustrating a process when the client A and the B have a change in call quality during a telephone call in the file transfer call mode in the PC-to-PC method.

* Explanation of symbols for main parts of the drawings

100: client 200: Internet phone server

210: Internet connection 220: PSTN connection

230: Internet / PSTN interworking unit 240: call setting unit

250: call quality monitoring unit 260: call mode switching unit

270: real-time call unit 280: file transfer call unit

290: central processing unit 300: Internet

400: PSTN (Public Telephone Network) 500: Telephone

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, an embodiment of an internet telephony method and a system by voice file transmission and reception according to the present invention will be described in detail with reference to the accompanying drawings.

1 is an overall configuration diagram of an internet telephony telephony system having a telephone call function by transmitting and receiving a voice file according to an embodiment of the present invention, and FIG. 2 is a block diagram of an internet telephony server according to an embodiment of the present invention.

In the present invention, if the call quality is poor while communicating with the other party while using the Internet phone, the voice is recorded by recording the voice to be delivered and generating a voice file, and transmitting the generated voice file. In order to confirm this, it is implemented to enable continuous communication with each other. As shown in FIG. 1, an internet telephony system includes a plurality of clients 100 and a telephone 500 for performing a telephone call, and Internet phone server 200 for establishing and controlling a telephone call between the client 100 or between the client 100 and the general telephone 500.

The client 100 is composed of a voice input / output device for a telephone call, that is, a computer having a microphone and a speaker, and the other client 100 or the telephone 500 that wants to make a call by accessing the Internet telephone server 200. Request a phone call with The Internet phone server 200 controls a telephone call via the Internet 300 by establishing a communication line between the client 100 requesting the telephone call, the client 100 and the telephone 500. Since the telephone call between the client 100 and the ordinary telephone 500 is made through the Internet 300 and the PSTN 400, the Internet telephone server 300 is suitable for data transmission and PSTN transmission. It transfers data format interchangeably.

As shown in FIG. 2, the Internet phone server 200 includes an Internet connection 210 connected to the Internet 300, a PSTN connection 220 connected to a public telephone communication network, an Internet 300 and a PSTN ( Internet / PSTN interworking unit 230 for interworking 400, call setup unit 240 for establishing a communication line between client 101 and client 102 or client 101 and telephone 501, and the set Real-time call unit 270 for transmitting and controlling voice data to make a telephone call in real time through a communication line, and checking the transmission rate of voice data transmitted through the Internet, and when the data rate falls below a predetermined standard, the quality of telephone call The call quality monitoring unit 250 that warns the client 100 or the phone 500 of this poorness, and the call quality of the phone may be poor so that one party cannot recognize the voice of the other party. In this case, the caller of the other side records his / her voice to be delivered, generates a voice file, and transmits the voice file to one party caller. The one party caller checks the received voice file and continuously controls the phone call. The unit 280 selects one of the real-time call mode of the real-time call unit 270 and the file transfer call mode of the file transfer call unit 280 according to the warning of the call quality monitoring unit 250 or the request of the caller. And a call mode switching unit 260 capable of switching modes so as to make a call, and a central processing unit 290 for executing and controlling each unit of the Internet phone server 200.

The reference data transmission rate in the call quality monitoring unit 250 is set to a data transmission rate such that the voice of the calling party can be understood by the receiving caller. In an embodiment of the present invention, the transmission rate of data transmitted to the receiving end is approximately equal. Although set to 12k bps (bits per second), the reference data rate may vary depending on the state of the client 100 or the Internet 300, or other conditions of the transmission error rate. When the voice data rate is lower than the reference data rate, the call quality monitoring unit 250 indicates a poor quality of the call to the receiving party, and when the original reference data rate is restored again, the call quality is restored. The display method of the call quality may be implemented in various ways such as sound or text.

The call mode switching unit 260 selects one of a real-time call mode and a file transmission call mode to make a phone call. The selection of the call mode is performed by the receiving caller in the call quality monitoring unit 250. According to the displayed call quality state and the call voice state felt by the other party, the caller of the other party is switched to the appropriate mode by changing the call mode, or the call quality monitoring unit 250 is directly connected to the sender according to the call quality state. You can request a conversion. That is, if the voice data transmission rate is lower than the reference data transmission rate and the call quality becomes poor, the call quality monitoring unit 25 displays the poor call quality and switches the call mode to the file transfer call mode so that the call is made. When the call quality is restored to the standard or higher again, the call may be requested to switch the call mode to the real time call mode so that the phone call can be made. Since the transmission rate of the voice data transmitted through the Internet may be different from the transmitting side and the receiving side, the communication mode is switched separately from the transmitting side and the receiving side.

The real-time call unit 270 performs a full duplex phone call by transmitting and outputting the caller's voice in real time, whereas the file transfer call unit 280 uses a half duplex call method. In case of transmitting the voice data, the voice data is stored in one completed file and transmitted.In case of outputting the voice data, the phone call is continuously made by reassembling the received voice data and completing the original file. do. This has the disadvantage that the time is somewhat delayed than the full-duplex phone call method of the real-time call unit 134, but even when the data rate is low, the voice can be output without interruption in the middle without noise.

The Internet / PSTN interworking unit 230 converts data transmitted in the form of packets between the client 100 and the Internet telephone server 200 into data in the form transmitted from the PSTN 400 or vice versa. It converts the data of the form into the data of the form used in the Internet 300 and transmits it so that the telephone call between the client 100 and the telephone 500 can be performed.

Internet telephone call method by transmitting and receiving voice files using the Internet telephony system consisting of the above configuration is the Internet during the real-time telephone call between the caller via the Internet 300 in step S10 as shown in FIG. Call quality determination process (S20) of judging the voice quality of the other party's caller by the computer or the caller's hearing transmitted through 300 and the real-time call mode or the file transmission call mode according to the call quality determination result. The call mode switching process (S30) for switching, and the caller who switched the mode saves his or her voice, generates a file, transmits it to the receiving side, and the transmitted voice file is output to the receiving side so that the receiving caller receives the voice. Internet phone call proceeds, including the voice file transmission call process (S40) that is continuously made by checking.

In the call quality determination process (S20), if the call quality monitoring unit 250 of the Internet phone server 200 detects a transmission rate of voice data received at both sides according to a phone call and becomes lower than a preset reference transmission rate, call quality Determining that the defect is bad so as to warn the receiving party through the voice or text. In addition, the call quality determination may determine whether the caller is defective by direct hearing.

In the call mode switching process (S30), the caller of one side whose voice data transmission rate received in the call quality determination process (S20) is lower than the reference rate is transmitted to the caller of the other side through the call mode switching unit 260 in real time. Switch from voice call mode to voice file transfer mode and request voice data to be sent so that the other caller can switch his call mode.

In the voice file transmission call process (S40), the caller who has switched the call mode generates and transmits a voice file containing the contents to be transmitted through the file transmission caller 280, and the caller of the other party transmits the transmitted voice file. A telephone call is made through the voice output device. If the transmission rate of the voice data recovers more than the reference transmission rate during the telephone call through the voice file transmission call process (S40), the phone call is made again by switching the mode to the original real-time telephone call method.

Hereinafter, an embodiment of an internet telephony call process using an internet telephony system will be described in more detail with reference to the accompanying drawings.

FIG. 4A illustrates a process when a communication line between the client 100 is established through the Internet phone server 200 in the PC-to-PC phone call method and an abnormality occurs in the call quality in the real time call mode. 4B is a flowchart illustrating a process when a change occurs in the call quality during a telephone call in the client A 101 in the real time call mode and the client B 102 in the file transfer call mode. Client A 101 is a file transfer call mode, and Client B 102 shows a process when an abnormality occurs in the call quality during a telephone call in the real time call mode, and FIG. 4D shows Client A 101 and the client. B102 shows the processing when there is a change in call quality during a phone call in the file transfer call mode. Prior to the description, the clients 101 and 102 are all connected to the Internet 300, and the call mode change may be changed by requesting the moderator to change the mode of the caller who does not recognize the call voice. do.

[PC-to-PC Phone Call]

As shown in FIG. 4A, first, client A 101 accesses the Internet telephone server 200 in step S110, and connects with the client B 102 who wants to make a telephone call to the connected Internet telephone server 200 in step S120. Request a telephone call connection. The Internet phone server 200 having received the call connection request calls the client B 102 in step S130 and performs a call connection process between the two clients 101 and 102, thereby establishing a connection between the client A 101 and the client B 102. A communication line is established through the Internet 300. When the call connection is established, the call quality monitoring unit 250 operates in step S140 to check the data transmission rate of the set communication line. In step S140, both the client A 101 and the client B 102 call in the real time call mode. You make a call.

If there is no abnormality in the voice call, the client A 101 and the client B 102 continue the call and, after completion of each other's business, the call is terminated through the step S160 and the step S170.

If, during the telephone call, the call quality monitoring unit 250 detects that the transmission rate of the voice data received by the client A 101 according to the telephone call is lower than the preset reference transmission rate in step S180, the call quality is poor. The caller of the client A 101 which generates a signal to warn and warns of poor call quality determines whether to change the call mode by directly determining the call quality state in step S210. If it is possible to hear the voice of the other party despite the warning of poor call quality, if the telephone call continues in the real-time call mode and the contents of the call cannot be understood, the client B 102 is requested in step S220 to change the call mode. When the caller of the client B 102 changes the call mode in step S230, the client A 101 transmits the voice data in the real time call mode, and the client B 102 transmits the voice data in the file transfer call mode. The telephone call continues. Although the call quality monitoring unit 250 does not generate a signal to warn of poor call quality during the above process, the caller voice of the client A 101 is delayed and there is a lot of noise in the caller voice of the client B 102 in step S200. If it is determined that it is not understandable, the client B102 may request to change the call mode through steps S210 and S220.

Since the data transmission on the Internet 300 is not always transmitted and received through the same line, but the fastest line for each packet is found and transmitted, the low data transmission rate of the client A 101 means that the data transmission rate of the client B 102 is also low. It is not. Therefore, since the reception voice of the client A 101 is not bad because the reception voice of the client A 101 is not poor, the call mode change request in the step S220 and the step S230 requires the other party to change the call mode according to the poor call quality. If there is, change the call mode.

While both the client A 101 and the client B 102 make a phone call in the real time call mode in step S150, the client A 101 may receive a request for changing the call mode from the client B 102 in step S410. This is requested by the client B 102 when the voice data transmission rate received by the client B 102 is not recognized properly and the telephone voice is not properly recognized. In step S420, the client A 101 requested to change the call mode is requested. The voice data is transferred from the real time call mode to the file transfer mode. Accordingly, in step S430, the client A 101 transmits the voice data in the file transfer mode, and the client B 102 transmits the voice data in the real time call mode.

The process of the telephone call after step S240 in which the client A 101 is in the real time call mode and the client B 102 is in the file transfer call mode is as shown in FIG. 4B.

Through step S240, the client A 101 transmits the voice data in the real time call mode and terminates the telephone call while continuing the telephone call by receiving the voice data transmitted from the client B 102 in the file transfer mode. If desired, the telephone call is terminated through steps S250 and S260. If, during step S270, the call quality monitoring unit 250 detects that the transmission rate of the voice data received by the client A 101 according to the phone call recovers above the preset reference rate, in step S280 A signal indicating that call quality has been restored normally is generated, and the caller of the client A 101 determines whether to change the call mode in step S290. When the call mode is determined and the client B 102 is requested to change the call mode in step S300, the client B 102 changes the call mode from the file transfer call mode to the real time call mode in step S310. ) And client B 102 both return to step S150 where they make a phone call in real-time call mode.

Further, during the telephone call in the call mode in step S240, if the client B 102 requests the client A 101 to change the call mode according to the reception voice failure in step S610, the client A 101 In S620, the call mode is changed from the real time call mode to the file transfer call mode to transmit voice data. Therefore, in step S630, both the client A 101 and the client B 102 make a telephone call in the file transfer call mode.

The change in the call quality that occurs while the client A 101 is in the file transfer call mode in step S430 and the client B 102 is in the real time call mode is performed through the process as shown in FIG. 4C. The mode is switched. That is, when an abnormality is found in the quality of the voice of the call received by the client A 101, the call mode of the client B 102 is switched so that both the client A 101 and the client B 102 call in the file transfer mode. When the call voice received by the client B 102 recovers to normal and requests the client A 101 to switch the call mode, the client A 101 switches modes to the client A 101 and the client B. All of the 102 calls are made in real time call mode.

In addition, the change in the call quality that occurs while both the client A 101 and the client B 102 make a phone call in the file transfer mode in step S630 is performed through the call as shown in FIG. 4D. The call mode or the telephone call mode of step S150 is returned.

Through the above process, a telephone call is made between the client A 101 and the client B 102. If the other party cannot recognize the voice properly due to a failure of real-time voice data transmission during the telephone call, the voice of one side caller is to be delivered. It is possible to make a telephone call by using a half-duplex method of storing and transmitting a file, and if the data transmission is good, the original real-time two-way telephone call can be made again.

[PC-to-Phone Phone Call]

First, the client 101 connects to the Internet telephone server 200 and requests a telephone call connection with the telephone 501 that wants to make a telephone call. The Internet phone server 200, which has received a request for a telephone call connection, calls the phone 501 through the PSTN 400 to perform a call connection process, and the client 101 and the phone 501 pass through the Internet phone server 200. The communication line is established through the Internet 300 and the PSTN 400. A communication line is established between the client 101 and the telephone 501 so that the telephone call quality monitoring unit 250 operates to check the data transmission rate on the Internet 300 during the communication line. All of the telephones 501 make a telephone call in the real-time call mode.

The processing of the poor call quality generated during the telephone call is handled by the PC-to-PC except that the Internet telephone server 200 is connected to and controlled by the telephone 501 instead of the client 102 on one side. Since the same, detailed description is omitted. However, since the caller does not have a function to control the call mode, unlike the client 101 configured as a computer, the caller of the phone 501 grasps the phone voice state by itself and changes the mode to the client A 101. The call mode can be changed by the request method, or the internet phone server 200 can be automatically switched according to the call quality. The change of the call mode is applied only to the Internet 300 section. In addition, the Internet phone server 200 can warn the caller of the telephone 501 the call quality defects in a predetermined manner, that is, a method such as a warning tone and the like, the caller of the telephone 501 by pressing a specific button call mode Can be changed and the voice recorded and transmitted.

In the case of a phone-to-phone phone call method, since the Internet phone server 200 must be provided for each phone, at least two or more are required, and the poor phone call quality generated during the phone call is provided on both sides of the Internet phone server. Telephone 501 using caller 200 is controlled in the same manner as above.

In the above, a telephone call in which the client A 101 and the client B 102 are connected through the internet telephone server 200, and a telephone call made by the client 101 and the telephone 501 via the internet telephone server 200. In the call and the Internet telephone call of the telephone connected to one of the Internet telephone server 200 and the telephone connected to the other Internet telephone server 200, the voice data transmission rate is lowered. We have described an internet phone that can accurately communicate between callers by recording a voice to create a file, transmitting the file, and confirming the file.

The Internet phone server 200 constituting the Internet phone call system not only serves to control the Internet phone call by establishing a communication line between the client 101 (102) or the phone 500, but also a voice input / output device. It can also serve as a client by itself. That is, an internet phone call is possible between the clients 100 and the internet phone server 200, and an internet phone call by transmitting and receiving a voice file according to the present invention is also possible. In addition, the present invention can be implemented to enable accurate communication by a method of storing and transmitting voice as a file when the call quality is poor even when a direct telephone call is made between the client 100 via the Internet (300) Do.

As described above, an Internet telephone having a telephone call function by transmitting / receiving a voice file according to the present invention is poor in call quality due to a decrease in data rate caused by data transmission characteristics of the Internet in all telephone calls made through the Internet. When the telephone call with the other party is not properly made, it is possible to continuously transmit accurate information by storing and transmitting the contents to be transmitted as a voice file.

Claims (5)

In the Internet telephony call method in which a real-time telephone call is made through a full duplex method through the Internet, Call quality discrimination process for judging the quality of telephone voice transmitted through the Internet during a phone call by the computer or the caller's hearing, Call mode switching process for switching the call mode according to the call quality discrimination result, and poor call quality In this case, the phone call is made, including a voice file transmission call process in which a phone call is continuously made by transmitting and outputting a file generated by storing the voice of the caller who switched the call mode to the other side. How to make an internet phone call. According to claim 1, wherein the call quality determination process by the computer, when the call quality monitoring unit 250 of the Internet phone server 200 detects the voice data rate according to the phone call is lower than the preset reference rate Determining that the quality is poor and displaying the call quality defect through the voice or text to the caller, and when recovering more than the preset standard transmission rate, it is determined that the call quality is good and the call quality is good through the text or voice to the caller. Internet telephone call method by transmitting and receiving a voice file, characterized in that to display. The method of claim 2, wherein the voice data transmission rate detected by the call quality monitoring unit (250) detects transmission rates received at both sides of the caller. The method of claim 1, wherein in the call mode switching process, the other caller switches his / her call mode through the call mode switching unit 260 at the request of one caller determined that the received call voice is poor. Internet telephone call method by sending and receiving voice file. The method of claim 1, wherein if the call quality is good during the telephone call during the voice file transmission call, the telephone call is made in real time through the call mode switching.