KR100234336B1 - Video on demand user terminal for internet search - Google Patents

Abstract

A T1 channel unit for demodulating a signal of a predetermined frequency band input through a telephone network; A first-in-first-out memory for processing data on a block-by-block basis with respect to demodulated data of the T1 channel unit; A control unit for controlling the entire operation according to the operation program and processing the transmission / reception data; A reception buffer for buffering the output of the first-in-first-out memory and outputting the buffered output to the controller; A transmission buffer for buffering transmission data from the control unit; And an RS-232C for modulating an output of the transmission buffer to transmit transmission data through the telephone network.

Description

[0001] The present invention relates to a video on demand user terminal for internet search,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subscriber terminal for a VOD service, and more particularly to a subscriber terminal for a VOD service having an Internet search function.

Generally, a video on demand service network has a high-speed transmission channel for transmitting unidirectional data of a wide band and a low-speed transmission channel for transmitting a narrow-band bidirectional control data. At this time, the high-speed transmission channel uses a T1 channel for high-speed data transmission and the low-speed transmission channel uses an RS-232C channel for bidirectional low-speed transmission of control data. Particularly, in order for a subscriber to directly receive a VOD service, a terminal for communication relay in the home is required, which is called a subscriber terminal (a set-top box: STB). The subscriber station transmits the corresponding control signal to the video server according to the function selection or menu selection of the subscriber, demodulates the received video information, and displays the screen on the television. However, the VOD service network can not use the Internet protocol TCP / IP because of the asymmetric communication line caused by the ADSL network. If the Internet search function is added to the Vodi service network using only the existing RS-232C, the transmission speed is 9.6 Kbps, which is slower than the Internet search speed using a general computer modem.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described problems of the related art by using a T1 channel, which is a unidirectional high-speed transmission channel, on a Vodi service network as a reception channel, and an RS-232C channel as a bidirectional low- And to provide a subscriber terminal for Vodi that can provide a high-speed Internet search function.

1 is an overall system configuration diagram for adding an Internet function to a Vodi service system;

2 is a diagram for explaining a SLIP packet data format for supporting a TCP / IP protocol on a VOD service system;

3 is a block diagram illustrating a subscriber terminal for a VOD service having an Internet function according to the present invention;

According to another aspect of the present invention, there is provided a VoD subscriber station having an Internet search function, including a T1 channel unit for demodulating a signal of a predetermined frequency band input through a telephone network, A reception buffer for buffering the output of the first-in-first-out memory and outputting the buffered output to the control unit; and a control unit for controlling the transmission / A transmission buffer for buffering transmission data from the control unit, and an RS-232C for modulating an output of the transmission buffer to transmit transmission data through the telephone network.

Hereinafter, a subscriber terminal for a VOD service having an Internet search function according to the present invention will be described in detail with reference to the accompanying drawings.

1 shows an overall system configuration diagram for adding an Internet function to a Vodi service system. In FIG. 1, reference numeral 1 denotes a telephone network, 2 denotes a T1 channel, 3 denotes an RS-232C channel, 5 denotes a VOD server, 10 is an Internet network, 15 is an Internet server, 20 is a subscriber network management system, 22 and 23 are high speed modem ADSL, 24 is a subscriber terminal, 26 is a TV, and 28 is a remote control keyboard. 1, the subscriber network management system 20 and the existing Internet server 15 are connected to the T1 and RS-232C channel transmission paths in order to implement the Internet search function according to the present invention on the existing Vodi service network . In order to provide the Internet search function, the device driver of the subscriber terminal 24 must be changed. In addition, it is preferable that a user input device for Vodi service use an OSD (On Screen Display) remote control keyboard rather than a conventional simple remote control type. 3 is a block diagram of a subscriber terminal according to the present invention. In FIG. 3, reference numeral 30 denotes ADSL, which is a high-speed modem connected to a telephone only, 32 denotes a T1 channel, 38 denotes an RS- FIFO, 36 is a receiving buffer, 40 is a transmitting buffer, and 42 is a CPU performing a control operation. Generally, when looking at the data flow between the subscriber side and the Internet server side when using the Internet search function, the amount of data uploaded from the subscriber side to the server side is not so large. On the other hand, the amount of data downloaded from the server side to the subscriber side is considerably larger than the uploaded data. Therefore, it is preferable that data transmission from the subscriber side uses a high-speed channel and conversely, data reception uses a low-speed channel. Therefore, the T1 channel, which is a unidirectional high-speed transmission channel, is used as a high-speed transmission channel and the RS-232C channel as a bidirectional low-speed transmission channel is used as a low-speed reception channel on the Vodi service network. The wideband unidirectional data input through the telephone network is input to the T1 channel unit 32 through the ADSL 30, which is a high-speed modem. At this time, the T1 channel unit 32 is the same as the T1 channel on the existing Vodi service network, and demodulates input data and outputs it to the FIFO 34. [ At this time, the FIFO 34 is for data processing on a block-by-block basis, sequentially storing input data, and outputting stored data according to a first-in first-out method. Buffered through the reception buffer 36 output from the FIFO 34, and then input to the control unit 42 for controlling the entire operation of the subscriber terminal and processing the transmission / reception data. In addition, the controller 42 executes a browser for browsing the Internet. At this time, the browser uses a multimedia application application interface (MAUI) or CDI-RAVE, which is a graphics library under an I-vision application environment for Vodi service. In addition, unlike traditional browsers that run on existing computers, browsers must perform browsing functions at the resolution of the TV. Meanwhile, the transmission data output from the subscriber terminal is buffered through the transmission buffer 40, modulated through the RS-232C 38, and then transmitted to the telephone network through the ADSL 30. However, in order to implement the Internet search function on the VOD service network, the existing data format must be changed to the SLIP packet data format as shown in FIG. In Fig. 2, "S0" indicates the SLIP start code, and "S1" indicates the SLIP end code. Therefore, the TCP data supporting the Internet protocol should be reconstructed into SLIP packet data as shown in FIG. At this time, the SLIP start code is treated as a synchronous byte and is written into the FIFO 34. To read the data written in the FIFO 34, the data is outputted to the reception buffer 36 until the SLIP end code is detected. At this time, the start of reading is performed when the FIFO 34 is full, and the recording operation of the FIFO 34 is stopped when the FIFO 34 does not find the SLIP end code until the FIFO 34 outputs all of the data.

As described above, in the conventional VOD service network environment, the Internet search function can not be implemented due to the protocol difference and the asymmetrical communication line. In order to solve such conventional problems, the present invention has been made in view of the fact that there is a large difference in amount of data to be transmitted and received in Internet search. In the present invention, a T1 channel is used as a high-speed reception channel and an RS- It is possible to search the Internet at high speed by using it as a low-speed transmission channel.

Claims (2)

A subscriber terminal for Vodi that provides a high-speed Internet search function by using a T1 channel, which is a unidirectional high-speed transmission channel on a Vodi service network, as a reception channel and an RS232C channel as a low-speed transmission channel in both directions as a transmission channel, A T1 channel unit for demodulating a signal of a predetermined frequency band input through the VOD service network; A first-in-first-out memory for processing data on a block-by-block basis with respect to demodulated data of the T1 channel unit; A control unit for controlling the entire operation according to the operation program and processing the transmission / reception data; A reception buffer for buffering the output of the first-in-first-out memory and outputting the buffered output to the controller; A transmission buffer for buffering transmission data from the control unit; And And an RS-232C channel unit for modulating an output of the transmission buffer to transmit transmission data through the VOD service network. The subscriber terminal according to claim 1, wherein the transmission / reception data comprises at least TCP data according to the TCP / IP protocol, a SLIP start code, and a SLIP end code.