KR200210679Y1 - Internet USB Phone Using By USB Isochronus Transmission Method - Google Patents

Abstract

The present invention is designed to be used conveniently by many Internet users using the product of the present invention in using a free telephone service using the Internet network, it is designed to be applicable to general telephones and various applications.

Hot plugging method that is automatically recognized even when a USB connector is connected even when the computer is turned on. It is an Internet phone that transmits voice and data simultaneously using the USB port to which up to 127 devices are connected. The devices are connected directly via USB HUB, making the computer easier to use.

USB serial communication has a transfer rate of up to 12Mbps, and the recent USB 2.0 standard has a transfer rate of 400Mbps, which enables various multimedia such as real-time video via USB.

By adopting isochronous transmission method among four data transmission methods of USB, it is possible to transmit important data of continuity such as video or voice of up to 8Mbps. This can provide more improved voice quality than the existing phone using the sound card, and it is possible to send and receive high quality multimedia files without a separate sound card. In addition, complicated cable configuration and software installation are easy, and users who do not know the internet or computer can easily use the Internet phone, and various user programs such as voice e-mail, automatic answering, and call recording are developed in connection with the computer. It was designed to be.

Description

Internet USB Phone Using By USB Isochronus Transmission Method

Unlike the Internet phone using the serial port (RS232C, MIDI Port), the present invention greatly improves the poor voice quality, which is a problem of the existing phone, and uses the Internet phone through the USB port with a transmission speed of 8Mbps. In order to replace the computer's built-in sound card, the cable is handled by a USB cable.

USB, as the name implies, is a serial bus. It is a serial communication method standardized for data communication between computers and external devices worldwide in February 1996. USB devices can be connected directly even when the computer is turned on, and up to 127 USB devices can be connected directly. The USB port provides + 5V power, so a keyboard, mouse, and hub can be used without a separate power supply. It can transmit 1.5 Mbps low-speed data and 400 Mbps high-speed data, and the computer assigns and manages all devices.

In USB, since a host and a device are one-to-many relationship, it is impossible to transmit and receive data with multiple devices at the same time strictly. This is because physical wiring can form a tree, but there is only one logical path. So, USB communicates packet between PC and device. Since the devices cannot synchronize, this also causes the host to handle all instructions for sending and receiving packets. The host sends a signal called Start Of Frame (SOF) every 1ms, and instructs the device to send and receive packets in sequence with 1 frame for 1ms. USB has three transmission modes for this packet communication. There are three modes because the data transmission characteristics required for the devices are different.

The most distinctive feature is isochronous transmission, which guarantees bandwidth during data transmission and is a mode for handling continuity-critical data such as video and audio. However, the retransmission request is not processed even if there is an error in data, unlike other transmission modes. It is the highest priority among frames, and it is possible to include up to 1,023 bytes of data in one frame, and transmission speed is guaranteed up to about 8Mbps (1MB / sec).

Interrupt transmission is the only transmission mode available for low speed devices at 1.5Mbps, which allows small amounts of data to be transmitted in real time. Input devices such as keyboards and mice use this mode. Even if devices with isochronous transmission are mixed, processing is possible within one frame, so there is no loss of real-time.

Bulk transmission is performed when there is room in the frame while performing the two transmissions described above. For this reason, there is no band guarantee, but when another device does not transmit data, data can be transmitted and received at high speed. This is used for devices such as printers that have a large amount of data but do not require immediateness.

The major difference between USB and traditional RS-232C serial interfaces is that all data transfers are directed at the host. For this reason, do not use IRQ. The USB interface consumes an IRQ, but it is used for notification between the USB interface on the PC side and the OS, and does not consume the IRQ for data transfer between the PC and the device. Since transmission and reception are performed in units of 1 ms intervals, the low speed device can sufficiently maintain real time. Already, most system chipsets for computers have built-in USB functions, and USB control chipsets for each device are also available at low cost.

It connects voice codec to existing USB controller and transmits digital voice signal through USB. This converts voice, which is an analog signal, into digital, increasing the immunity to noise to reproduce high quality voice. The sound card's clocking noise and voice interruption were digitally processed to increase the phone user's satisfaction.

Currently operating systems that support USB devices are Windows 95 OSR2.1 and later and Windows 98. Windows 98 includes a USB driver by default, so it is automatically recognized without installing a separate driver program.

The device of the present invention is composed of blocks having the function of a general telephone and a USB controller for transmitting and receiving various signals with a computer as shown in FIG. Detailed description thereof is as follows. The bridge circuit 100 is connected to a general telephone trunk line and serves to transmit a signal when using a general telephone. The ring detector and dial generation block 101 detects a ring signal from a general telephone line and receives a dial signal from the keypad block 107 to generate a DTMF signal or a pulse signal when the user makes a phone call. It is a place to give. The voice processing unit 102 is a block to adjust the voice signal to an appropriate level when making a phone call using a general telephone and the Internet so as to give or receive a voice signal with a handset. The switch matrix 105 is a switch circuit that connects the voice signals transmitted and received when using the Internet phone to the voice processing unit 102. Also, the device of the present invention may function as a sound card when the Internet phone is not used. It also serves to switch the multimedia signal to be played or recorded to the external speaker (104). The key pad 107 is a key input block for generating various signals allowing a user to directly press a telephone number and various control signals to use a general telephone or an Internet phone. The voice codec 106 converts the digitized voice signal from the USB controller 108 into analog when using an Internet phone and converts the analog signal into a digital signal so that the microphone signal of the handset can be transmitted to the USB controller. . The USB controller 108 is connected to the computer USB port to transmit and receive various control signals and voice signals, and is connected to the keypad block 107 to receive the telephone number when using the Internet phone to process this data and transfer it to the computer, In addition, it recognizes the on-hook or off-hook signal to control the signal to the computer to perform the call processing of the Internet phone, converts the digitized voice signal to be transmitted and received, and sends it to the computer or to the voice codec 106. The LCD or LED block 109 is a display block that visually shows the user the status of the Internet USB phone. Since the use of a regular phone is a normal use procedure, it is omitted here and only the method of using an Internet phone is discussed. When the user picks up the handset to use the Internet phone and presses a specific key (*, # or a specific key) on the keypad 107, the USB controller 108 senses this signal and sends initialization data to the computer and switches the matrix 105 ) To change the voice signal transmission path. Of course, at this time, the LCD or the LEC block 109 indicates that the Internet phone is in use. After that, you can connect to a specific internet toll-free site, press the other's phone number, press a specific key (*, # or a specific key), and the phone number will be sent out. After finishing the call, the user drops the handset 103 to the telephone, and the USB controller 108 detects an on-hook signal and returns the telephone to a normal telephone state. A flow chart for the Internet phone telephony procedure is shown in detail in FIG. 5. In general, the USB controller 108 has a built-in one-chip microprocessor and memory, so that various functions, such as phone number memory input, memory dialing, and redial, can be easily performed by those skilled in the relevant field. There is.

The purpose of the present invention is to make it easy for the public to install and maintain, such as using an Internet phone and using a regular phone. As shown in FIG. 2, when the user connects only the USB cable between the device and the computer of the present invention to use the Internet phone, the basic setting is completed. Most computers nowadays support USB ports, and USB devices are automatically recognized when they are plugged in regardless of the computer's power source. The device of the present invention is also automatically registered as a USB audio device when connected to a computer, and multimedia files such as MP3 can be used even in this state. However, in order to fine tune Internet phone and sound card, separate application program and sound card driver program should be installed.

The quality of call is lower than that of the existing telephone network by accessing the site that provides the Internet telephone service and using the Internet telephone. This does not guarantee continuous voices due to server load or Internet line conditions. In addition, since the voice signal is received from the sound card mounted in the computer, the sound quality may be degraded due to the noise of the computer itself and unnecessary frequencies during the voice call. For this purpose, digital signal processing of continuous voice signal of USB enables transmission and reception of high quality voice signal.

1 is a block diagram showing a structure having an Internet phone function and a general phone function using a USB port according to the present invention,

Figure 2 is a connection diagram between a computer and the Internet USB phone to which the present invention is applied

Figure 5 is a flow chart showing the flow of the device when using the Internet phone and a normal phone using a USB port according to the present invention,

<Explanation of symbols for main parts of the drawings>

100: tip, ring bridge circuit 101: ring signal detection and dialing circuit

102: transmission and reception voice processing unit 103: Hand Set

104: external speaker connection jack 105: switch matrix

106: voice codec 107: key pad

108: USB controller 109: status display device

The device of the present invention is constructed as follows. It consists of 1) Internet phone and general phone with built-in USB controller and voice codec, and 2) USB cable and trunk line phone cable used to connect USB port.

The device of the present invention is composed of a USB controller block 108, which functions as an Internet phone, and a voice codec 106 for voice signal processing, and a bridge circuit block 100 which can be used by being connected to a trunk line by a general telephone. It consists of a general telephone block such as a ring detection and dial signal generating block 101, a voice processing block 102, a keypad block 107, and the like. There is a separate jack for directly connecting the external speaker 104 by not using a sound card inside the computer. All configurations are simple with a 4-wire USB cable.

In order to use an Internet phone, a computer with a web browser must be connected to the Internet through a modem or a dedicated line.

As described above, the complex connection cable of the computer can be simply configured, and the user can use multimedia files including Internet phone without a separate sound card, and the device of the device also includes the functions of a general telephone. Can be selected accordingly. It will dramatically improve the poor voice quality of existing Internet phones, which will enable the use of the Internet. It will also enable the continuous addition of devices and performance improvements using the USB port.

Claims (2)

USB is used between the device and the computer to use the Internet phone. Isochronous digital voice data is serially communicated, and is automatically switched to a normal phone state and an internet phone state according to the control signal of the keypad 107. When using an internet phone, the phone number data received from the keypad is Directly entered in the dialing window of the Internet toll-free site, it is connected to external speakers via the internal switch matrix block 105 to act as a sound card for the computer, and this method is applied to regular telephone functions. Internet phone telephone configured in a scheme application. The Internet phone telephone according to claim 1, comprising an LCD and an LED display device for the user to easily recognize the state of the Internet phone telephone.