PSTN and ADSL combined audio visual telephone

The first video telephone combining PSTN and ADSL Technical Field: The present invention relates to a telephone, and more particularly to a video telephone combining PSTN and ADSL. Background Art: As the analog telephone network (PSTN) has the most complete infrastructure, the highest popularity, and the lowest price, it has always played the mainstream of data communication. In addition, in recent years, the rapid development of the Internet, especially World~Wide ~Web (WWW), in addition to providing traditional e-mail transmission services, it also combines various multimedia services such as voice, pictures, and moving images. With these services, there is a huge amount of data, so In order to obtain higher-speed data access capabilities, ISP operators have proposed various solutions to increase the transmission rate; and when multimedia on the Internet becomes more and more popular, the modem of 28.8, 33.6 or 56kbps is better for the traditional dial-up mode. For users of the telephone network, it is becoming increasingly unsatisfactory (currently, users on the local area network and ISDN users cannot meet the current rate provided by the network).

So that the illegal SL (DigitarSubscribet^Line) digital subscriber loop gradually attracted everyone's attention. DSL, as its name suggests, is a digital subscriber line. Among them, ADSL (Asymmetric Digital Subscriber Line) is currently the most noticed ~DSL technology, because it can use the existing PSTN (POTS) line to transmit high-transmission rate messages. It is necessary to increase the technology of existing infrastructure equipment, and its related standards have been formulated, which will definitely bring us considerable benefits in the future; secondly, the direct translation of ADSL means "asymmetric digital subscriber line", which is simple It means to use the high frequency band (30Γ1ΜΗζ) in the existing telephone line (the copper telephone line in the current home users) to transmit the signal, which does not overlap with the low frequency band (0~4KHz) occupied by the telephone voice, so it can be used at the same time Transmit voice and data, and increase the transmission rate.

Because ADSL uses existing PSTN (POTS) lines to transmit high-rate information, traditional telephone functions are indispensable. Among the 1MHz bandwidth, the lowest 4KHz bandwidth (0-4KHz) is used for traditional telephone services; this 4KHz bandwidth is called

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POTS^Splitter's passive filter is separated from the 1MHz bandwidth and is used for traditional telephone services. The other 100KHz to 1.1MHz is transmitted at a maximum of 6 bits per second. Computer information. Moreover, because the ADSL signal is combined on the same line to transmit the power of the POTS signal, it is provided by the telecommunications company, so even if the ADSL line is unavailable or your computer is turned off, it still has power, so the user still You can use the POTS channel to separate the voice signal from the ADSL signal to make a call. Because ADSL separates the traditional telephone service and the computer data service on different channels, it can ensure that the telephone service will not be unavailable due to ADSL service failure or suspension; this means that even if you use ADSL for multimedia transmission, the telephone It can still operate normally. Moreover, in recent years, with the launch of a number of related products, the communication bandwidth of PSTN has been directly improved or indirectly reduced users demand for bandwidth. In addition, the penetration rate of the newly launched communication network in the short range is still quite high. Limited, so the PSTN is still the mainstream of the data communication network.

Summary of the invention: The present invention aims to provide a telephone device that can use traditional telephone lines (twisted pair) for two-way transmission of video and sound. It can not only use PSTN (Public Switched Telephone Network) and use copper wires to transmit analog (ANALOG) Voice telephone system) In addition to the voice transmission function of general telephones, it can also use the high frequency band (25KHZ~1MHZ) of ADSL (Asymmetric~Digital~Subscriber~Line) to transmit video data, which can be used for both parties while receiving and speaking. Image signal transmission.

According to a video phone combining PSTN and ADSL provided by the present invention, the structure of the video phone is that the main body of the PSTN system is the main body of the video phone, and the main body of the phone has a basic analog sound transmission line, as well as a device for receiving and sending sound. The handle, and dial components, and the overall video phone is composed of the PSTN system. The phone body is also equipped with: a control module unit connected to the call line of the phone body to form the voice transmission of the PSTN phone, and When the phone is activated, it sends out a signal for dialing and connecting the ADSL module unit; --The ADSL module unit is connected to the PSTN line to use the PSTN line to dial the Internet after receiving the signal activation of the control module unit , To form the digital signal transmission of both the receiver and the speaker; an image capture and display unit, connected to the ADSL module unit, has an image sensor and a display to obtain the callers information from the image sensor image

03155834.8 The video signal is transmitted to the caller at the other end through the ADSL module unit, and the video signal transmitted by the caller at the other end is presented by the display; therefore, the video phone can be directly connected to the PSTN line When the user of the caller picks up the handle of the video phone and dials the phone number of the callee, when the caller and caller are using the video phone at the same time, the control module unit is activated to send a signal. The ADSL module unit is dialed and connected, and the TP address is obtained. When the control module unit in the video phone of the callee receives the ringing signal from the caller, and after the user picks up the handle to activate it, it immediately sends out a signal Make the ADSL module unit dial up to get another IP address, and return the IP address to the callers ADSL module unit, so that the caller can connect to the callees IP according to the original IP address and start to transmit the call to each other. The video data of the callee can use PSTN as the voice transmission function of general telephone, and use the high frequency band of ADSL to transmit video data, which can transmit video signals of both parties while receiving and speaking.

A video phone combining PSTN and ADSL provided in accordance with the present invention has the following advantages: Since the phone body of the general PSTN system is combined with a control module unit, an ADSL module unit, and an image capture and display unit to become a usable Traditional telephone line (twisted pair) is a video phone with two-way transmission of image and sound. PSTN can be used as the voice transmission function of general telephone, and the high frequency band (25KHZ~1MHZ) transmission of ADSL (Asymmetric^DigitaPSubscriber^Line) Video data can be used to transmit video signals for both parties while receiving and speaking, realizing the purpose of videophone.

Brief Description of the Drawings: Figure 1 is a schematic diagram of the basic structure of the video phone in the present invention.

Figure 2 is a schematic diagram of the audio and video transmission state of the video phone in the present invention. The names of the labels in the drawings are:

1...Video phone 11···Phone body 111···Handle 12···Control module unit

13-ADSL module unit 14...image capture, display unit 141...digital image sensor 142...digital display Specific implementation: Refer to Figure 1, the present invention combines PSTN and ADSL video phone, the structure of the video phone is a PSTN system The phone body 11 is the main structural body, and the phone body 11 has a basic

03155834.8 The analog voice transmission line, as well as the handle 111 for receiving and sending voice, and the dialing component are not shown in the figure, and the composition of the overall video phone 1 is to cooperate with the PSTN system. The phone body 11 is also installed with: a control module The unit 12 is connected to the call line of the phone body 11 to form the voice transmission of the PSTN phone, and to send a signal to make the ADSL module unit 13 dial online while the phone is activated; ... ADSL module unit 13, and The PSTN line is connected, and after receiving the signal activation of the control module unit 12, the PSTN line is used to dial-up the Internet to form a digital signal transmission between the receiver and the speaker; an image capture and display unit 14 is connected to the ADSL The module unit 13 is connected and has an image sensor 141 and a display 142. The image sensor 141 and the display 142 can directly convert images into digital signals for transmission. The digital image signal of the caller is obtained, and the image signal is transmitted to the caller at the other end through the ADSL module unit 13, and the display 142 presents the image signal transmitted by the caller at the other end.

Wherein, the ADSL module unit 13 not only forms a dial-up Internet connection structure, but also combines the 4KHz POTS signal with the DSL signal, and then transmits the signal to the client through the existing PSTN line. After the filter (MlteC will The POTS signal is separated from the digital signal, and then the digital signal is demodulated or decoded. As for the image sensor 141 in the image capture and display unit 14 can be composed of CCD components to directly capture the digital image signal, Of course, it can also be a digital image sensor composed of relatively inexpensive CMOS components, which can also be used to capture digital image signals to facilitate the signal transmission of the ADSL module unit 13, and the display 142 can be an LCD liquid crystal display. Or other displays that can directly display the received digital image signals.

The video phone 1 of the present invention can be directly connected to the PSTN line, and when the receiver and the caller use the video phone 1 at the same time, when the user of the caller picks up the handle 111 of the video phone 1 and dials the receiver's When the phone number is activated, the control module unit 12 is activated to send a signal to enable the ADSL module unit to dial and connect, and obtain an IP address. The control module unit 12 in the video phone 1 of the callee receives the call When the users ringing signal is activated, and after the user picks up the handle 111 and activates it, a signal is sent out to make the ADSL module unit 13 dial up and get another connection.

TP address, and transmit the IP address to the ADSL module unit of the caller through the audio signal

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In 13, the caller connects the callee's IP according to the original IP address, and starts to transmit the image data of the caller and callee to each other.

Refer to Figure 2, to achieve the voice transmission function of general telephone using PSTN, and use the high frequency band (25KHZ~1MHZ) of ADSL (Asymmetric~Digital~Subscriber~Line) to transmit image data, which can be done while both parties are receiving and speaking. The purpose of the image signal transmission between the two parties; in particular, the image transmission between the two parties can be completed by the traditional call action without changing the original dialing habits, which highlights the convenience of operation and use.

The video phone combining PSTN and ADSL of the present invention combines a general PSTN system telephone set with a control module unit, an ADSL module unit, and an image capture and display unit to form a traditional telephone line (twisted pair) for image and sound. The two-way transmission video phone can use the PSTN as the sound transmission function of the general phone when in use, and use the high frequency band (25KHZ~1MHZ) of ADSL (Asymmetric Digital Subscriber^Line) to transmit image data, and can receive and send calls between both parties At the same time, it does the image signal transmission between the two parties, providing a better and feasible video phone.

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