KR100431362B1 - Wireless network system for receiving digital television broadcasting - Google Patents

Abstract

The present invention relates to a wireless network system for digital broadcast reception.

A wireless network system for receiving a digital broadcast of the present invention comprises: a TV broadcast receiver for receiving an A / V signal, tuning and channel decoding the A / V signal and transmitting the same to a wireless video transmission / reception module through an interface; A wireless video transmission / reception module including a wireless interface for receiving a channel demodulated A / V signal from the TV broadcast receiver, processing a signal including encryption, and transmitting the signal to a display device through a wireless interface; Technical features include a display device for receiving and displaying an A / V signal through a wireless interface of the wireless image transmission / reception module.

Accordingly, the present invention provides a wireless network system for receiving digital broadcasts by connecting digital TV broadcast receivers and display devices that are far away from each other without installing a separate cable to transmit video signals. It is easy to connect multiple display devices, and it is possible to install each display device in any place and shape regardless of the position of the digital TV broadcasting receiver. By applying it as it is, there is no need to make a new standard related to this, it is possible to apply only the current technology and commercialization is easy.

Description

Wireless network system for receiving digital broadcasting

The present invention relates to a wireless network system that can easily transmit a video signal using an existing copy protection system and interface by adding a wireless interface to a CAS module which is widely used for receiving pay TV broadcasting of digital cable and satellite TV. will be.

Currently, digital TV broadcasting receivers, which have been standardized and commercialized, are being released in two forms: an integrated TV with a display and a set-top box (STB) separated from the display.

In the case of an integrated digital TV broadcast receiver, there may be an additional interface for outputting a video signal, but in general, the STB essentially includes a video signal interface for connecting to a display.

Most of these interfaces output analog video signals for use in the mainstream analog display, and some of them have a digital interface.

In recent years, Open Cable, a US digital cable TV standard, employs IEEE 1394 and DVI interfaces with anti-piracy for digital video output.

This anti-piracy function is very strict in the case of digital contents, so once the standard in operation is established, other digital video output interfaces cannot be used in cable TV STBs in Korea or the US. It is expected to spread worldwide.

In addition, with the emergence of the digital TV industry, all displays have been digitized. Unlike the analog method using CRT, the display is very light and small, so it can be installed on a wall like a picture frame or installed in a small space. .

Recently, there is a tendency to install a display in various forms in various places, unlike conventional TVs, by utilizing these advantages, and it is expected that the trend of installing one or more digital TVs in one home will be intensified.

As such, in order to receive a video signal from a display remote from the digital TV broadcasting receiver through a wired interface, a corresponding cable must be separately installed for the IEEE 1394 or DVI interface as shown in FIG. 1.

However, when using only a wired network as shown in FIG. 1, it is not possible to place a TV broadcast receiver and a display in an arbitrary location according to the user's convenience, and the two systems should be placed in close proximity, and when the remote is placed, a new wired network must be separately installed. There was this.

In addition, a method of separately adding a conversion system for converting video data of a wired network to a wireless interface may be considered. However, in this case, an illegal copy prevention function must be newly added to the wireless interface. There is a problem.

At present, digitalization of satellite and cable TV, including terrestrial waves, is in full swing, but concerns about illegal copying and distribution of paid contents are the biggest obstacles.

Accordingly, in order to solve this problem, digital cable TV STBs have a tendency to mandate the output of video signals through a wired network such as an IEEE 1394 interface with illegal copy protection.

However, in this case, since the outputs of all digital TV broadcast receivers (TV, STB, etc.) have a wired network interface, a long cable connection is required for application to a wall-mounted display that can be installed far from the digital TV broadcast receiver. Etc., causes inconvenience in use.

In addition, according to the trend of sharing home appliances in the home through the activation of the home network, if the configuration of installing a digital TV broadcasting receiver in the living room and arranging display devices in each room is used, the displays are connected by wire. In order to install a new wired network, there are many problems in cost and ease of use.

Accordingly, the present invention is to solve the above-mentioned disadvantages and problems of the conventional digital broadcast receiving system, and to transmit the video signal of the broadcast received by the digital TV broadcast receiver to each display device by wireless to separate the wired network It is an object of the present invention to provide a system that enables sharing of a digital TV broadcast receiver without the need for installation.

It is another object of the present invention to provide a system that can be applied without modification of a digital TV broadcast receiver which currently has standardization and no longer has a wireless interface equipped with an illegal copy function as a final output. .

1 is a conceptual diagram illustrating a wired network system for receiving a conventional digital broadcast.

2 is a conceptual diagram illustrating a wireless network system for digital broadcast reception according to the present invention.

3 is a block diagram showing a wireless image transmission and reception module according to the present invention.

4 is a block diagram illustrating an interface of a display device for wireless image transmission and reception according to the present invention.

The object of the present invention is provided with a wireless interface for receiving audio and video signals (hereinafter referred to as A / V signals) from the TV broadcast receiver and the TV broadcast receiver to the display device through the wireless interface. It is achieved by a wireless network system for digital broadcast reception comprising a display device for receiving and displaying an A / V signal through a wireless image transmission / reception module and a wireless interface.

Details of the above object and technical configuration of the present invention and the effects thereof according to the present invention will be more clearly understood by the following detailed description with reference to the drawings showing preferred embodiments of the present invention.

First, FIG. 2 is a conceptual diagram illustrating a wireless network system for receiving digital broadcast according to the present invention.

As shown, the wireless network system for receiving digital broadcasting according to the present invention implements an interface between a TV broadcasting receiver and display devices using a high speed wireless modem.

That is, in an environment where the digital TV broadcasting receiver and the display devices installed in various places desired by the user are separated from each other, the A / V signal is transferred from the TV broadcasting receiver to each display device through a high-speed wireless modem without installing a separate cable. send.

The TV broadcast receiver refers to an integrated TV or a set-top box (STB) separated from the display. A high-speed wireless modem is provided in the set-top box (STB) or a display device.

Next, FIG. 3 is a diagram illustrating a wireless video transmission / reception module according to the present invention, and FIG. 4 is a diagram illustrating an interface of a display device for wireless video transmission and reception according to the present invention.

As shown, the wireless network system for receiving a digital broadcast according to the present invention adds a wireless interface to a wireless video transmission / reception module that can be externally connected to the TV broadcast receiver. The channel demodulation is performed in a tuner and a channel decoder of the TV broadcast receiver. The A / V signal of the broadcast program is input to the wireless video transmission / reception module via the PCMCIA interface.

The wireless video transmitting / receiving module may use a conditional access system module that is currently used to receive pay broadcasting of digital cable and satellite TV broadcasting receivers. In this case, the input A / V signal may be received only by a specific subscriber. To help.

The limited reception system (CAS) is a system for receiving only a subscriber who is qualified to receive a paid broadcasting service, and is a paid broadcasting receiver that encrypts a specific broadcast so that a viewer can watch it only by paying a certain amount of money. It consists of three areas: scrambler, key management, and subscriber database management. The receiver finds the control words necessary for decryption using the IC card.

The conditional access system is a common interface type, and the common interface is divided into the PCMCIA module, which is able to watch pay TV, so that the CAS function can be performed by inserting the module into the common interface slot of the receiver. It is an interface defined.

Therefore, the wireless video transmission / reception module descrambles the scrambled A / V signal through a descrambler so that only a specific subscriber can receive it, reacquires a copy-protected signal, plays back a video and audio signal for viewing, and The V signal is encrypted to prevent illegal duplication and then transmitted to an external display device through a high-speed wireless modem for display.

In addition, by controlling the switch in Figure 3 also performs the function of receiving the A / V input from the other device through a high-speed wireless modem to output to the TV broadcast receiver.

At this time, the TV broadcast receiver decrypts the encrypted A / V signal, performs A / V processing, and outputs the same to the necessary device. Therefore, in order to prevent illegal copying of broadcast contents, an encryption technique for encrypting data input and output between a wireless video transmission / reception module and a TV broadcast receiver and an algorithm for mutual authentication process between two devices are essential.

On the other hand, in the case of a display-only device that does not have a built-in digital TV receiver for playing and receiving the received audio and video signals as original audio and video at the same time, the wireless module transmits and receives an interface module as shown in FIG. The data inputted from the module is processed to display the pay broadcasts of the digital cable and satellite TV broadcast receivers.

Accordingly, the wireless network system for receiving digital broadcasting according to the present invention can be connected to a digital TV broadcasting receiver and display devices that are far away from each other without installing a separate cable to transmit video signals. It is easy to connect multiple display devices, and each display device can be installed in a place and shape desired by a user regardless of the position of the digital TV broadcasting receiver.

Therefore, users can create a more comfortable and pleasant living space by enabling a variety of living environments and interiors, and home appliance makers have the opportunity to develop new home appliances as the degree of freedom in form and application of display devices increases. There is an effect.

In addition, by applying the existing copy protection technology as it is, there is an advantage that it is easy to commercialize it can be applied only to the current technology without the need to create a new standard related to this.

Claims (5)

A TV broadcast receiver which receives an A / V signal, tunes and decodes it, and transmits the A / V signal to a wireless video transmission / reception module through an interface; A wireless video transmission / reception module including a wireless interface for receiving a channel demodulated A / V signal from the TV broadcast receiver, processing a signal including encryption, and transmitting the signal to a display device through a wireless interface; And Display device for receiving and displaying the A / V signal through the wireless interface of the wireless image transmission and reception module Wireless network system for digital broadcast reception, characterized in that comprising a. The wireless network system of claim 1, wherein the wireless interface is a high speed modem. The wireless network system of claim 1, wherein the wireless video transmission / reception module is connected to an external device separately from a TV broadcast receiver. The digital broadcasting as claimed in claim 1, wherein the wireless video transmission / reception module includes a wireless interface for wirelessly transmitting A / V signals to a display device in a conditional access system having an anti-piracy function. Wireless network system for reception. The wireless network system for receiving a digital broadcast according to claim 1, wherein the TV broadcast receiver is integrated with a display device.