KR20100010098A - Digital television system and multimedia data distribution method of it - Google Patents

Abstract

PURPOSE: A DTV system with a recording function and a multimedia data distribution method thereof are provided to perform a DRM processing and a format conversion of multimedia data and distribute multimedia data to multimedia contents players belonging to home domain system. CONSTITUTION: An image processing unit processes an antenna and a broadcast signal inputted by wire and outputs it to a display device. A storage unit(280) stores the multimedia data. An NFC(Near Field Communication) module(290) performs a data communication with an external portable device. A data distributor determines necessity of data format conversion if a distribution indication of multimedia data stored in the storage unit is received. The data distributor receives an approval of the data format conversion from a user and performs the data format conversion and DRM(Digital Right Management) processing to transfer it to the portable device through the NFC module.

Description

DIGITAL TELEVISION SYSTEM and MULTIMEDIA DATA DISTRIBUTION METHOD OF IT

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital television system having a recording function, wherein a digital television system capable of changing a data format when transmitting multimedia data stored to an external portable device is transmitted.

In general, a television receives a broadcast signal, that is, a video signal and an audio signal through an antenna, and can be viewed by a user through a monitor through various signal processing including detection, tuning, and demodulation, or from an external input signal VCR or audio. As a device for reproducing an input signal, a digital image compression technology such as MPEG or a large amount of information such as a hard disk or a compact disk have been recently advanced by simply restoring an input broadcast signal and reproducing it or reproducing an external input signal. It has been developed into a digital television that can be multifunctional by combining storage technology.

Digital television can play various formats of video and even be connected to the Internet to implement web surfing or download multimedia content. It can be seen that digital television can be a device for collecting various multimedia data based on moving image data.

On the other hand, in terms of copyright protection of multimedia contents, various DRM tools have been proposed and applied. The method of encrypting multimedia contents so that they are played only on a designated playback device is a coordination between the user's convenience and enhanced copyright protection. It is strongly suggested.

In the case of applying the above method, a multi-media content player is held in a home, and in consideration of a user environment in which the retention situation frequently changes, it serves as a regional DRM management server that authorizes a specific device to multimedia content. Implemented implementations have been proposed. The solution is called a home domain system, in which case the local DRM management server is called a home domain management server.

In the case of digital television, it is relatively expensive and bulky, and the user's retention period is quite long. Therefore, it can be seen that it is desirable to implement the digital television to perform the role of the home domain management server in the home domain system.

On the other hand, a sufficiently large digital television has a large processing capacity processor and a high resolution display device, whereas a multimedia device carried by a user has a relatively low processing capacity processor and a low resolution display device. Therefore, it is inefficient and unreasonable for a portable multimedia device to directly process multimedia data for digital television.

For example, current terrestrial broadcasting is in MPEG2 format, and Internet contents are mostly shared in SD-level MPEG2 or SD / HD MPEG4 due to the efficiency of IP network and limitation of production tools. Because of video, video and decoder capability and internal storage limitations, only MPEG4 or WMV9 video formats can be used to play content stored on digital televisions directly from portable devices. Accordingly, there is a difficulty in not using much of the content stored in the digital television as it is, and searching for and downloading the content from a separate PC and transmitting the content to a portable device.

However, until now, a method for efficiently performing DRM processing and format conversion of multimedia data using a digital television has not been proposed.

The present invention devised to solve the above problems is to provide a digital television system for performing DRM processing and format conversion of multimedia data.

In addition, the present invention is to provide a digital television system for distributing multimedia data to a variety of multimedia content playback devices belonging to a home domain system.

According to an aspect of the present invention, there is provided a method for distributing multimedia data stored in a storage unit of a digital television to a portable device through a short range communication channel. Confirming; Determining whether data format conversion is required when downloading the multimedia data indicated by the user to the portable device; If data format conversion is required, displaying a data format query screen; Converting the format of the multimedia data according to a user's instruction; Performing DRM processing necessary for the converted multimedia data; And transmitting the DRM-processed multimedia data to the portable device.

According to another aspect of the present invention for achieving the above object, a digital television includes a display device for outputting an image; An image processing unit which receives an antenna or a broadcast signal input from outside and performs a necessary image processing and outputs it to the display device; A storage unit for storing multimedia data; A short range communication module for performing data communication with an external portable device; An operation unit for receiving a user's instruction; Upon receiving a user's instruction for distributing multimedia data stored in the storage unit to an external portable device through the operation unit, it is determined whether data format conversion is required to meet the specification of the portable device, and the data format conversion is performed by the user. Approved by, to perform the data format conversion and DRM processing on the multimedia data, characterized in that it comprises a data distribution unit for transmitting to the portable device through the short-range communication rate.

By implementing a method of distributing multimedia data according to the above configuration to a portable device and a digital television system for performing the same, it is convenient to perform DRM processing and data format conversion for multimedia data by using digital television which is essentially distributed in each home. There is an advantage that can be done.

In addition, the present invention has an advantage to perform a home domain management server function for distributing multimedia data to a variety of multimedia content playback devices belonging to a home domain system digital television.

1 is a block diagram schematically showing the configuration of a digital television system according to an embodiment of the present invention.

In the illustrated digital television system, a short range communication means for performing data communication with a portable device is implemented as a Bluetooth communication means, but the short range communication means may be implemented as a short distance wired / wireless data communication means such as a USB communication means or an RF communication means. It may be.

Referring to FIG. 1, the digital television system includes an IR receiver 200, a controller 210, a memory 220, a tuner 230, a demodulator 240, a demultiplexer 250, a decoder 260, a display. Device 270, storage 280, and Bluetooth communication module 290.

The tuner 230 transmits a radio signal transmitted through the antenna to the demodulator 240 according to the interpretation information of the remote control code selected by the user, and the demodulator 240 transmits the radio signal transmitted from the tuner 230. The signal is converted into an IF signal and transmitted to the demultiplexer 250.

The demultiplexer 250 parses various pieces of information such as audio, video, and other data multiplexed on the signal transmitted from the demodulator 240.

The decoder 260 decodes the audio and video signals and the data signals obtained by parsing by the demultiplexer 250, processes them to be viewed by the user, and outputs them through the display apparatus 270.

In the illustrated digital television, as an operation unit for receiving a user's instruction, an IR receiver 200 which receives remote control code information selected by a user and transmits it to the control unit 210 is applied. It is possible to substitute by other means for, and if replaced is also within the scope of the present invention.

Through the IR receiver 200, a download instruction of stored multimedia data, a selection of multimedia data to be downloaded, a selection of a portable device to be downloaded, a selection of a data format to be converted for the multimedia data to be downloaded, a data format conversion instruction, and the like. One or more of the user instructions according to the spirit of the present invention may be input. That is, when the user performs one or more of the instructions through the remote controller, the digital television receives it through the IR receiver 200.

The controller 210 controls the operations of the IR receiver 200, the memory 220, the tuner 230, the demodulator 240, the demultiplexer 250, and the decoder 260. A circuit block including a single processor chip or a processor that is implemented as a separate single processor chip or a circuit block including a processor or integrated with another component (eg, a demultiplexer or a decoder) that performs an operation processing operation. Can be implemented.

The memory 220 may include a flash ROM storing software such as an operating system and a DRAM storing a program loaded for a virtual screen and / or additional functions in the form of a bitmap that can be displayed on a display device.

The storage unit 280 may store not only broadcast video data reproduced in a digital television but also multimedia data in various formats including images and sound data. For example, the audio / video signal and the data signal obtained by parsing by the demultiplexer 250 may be stored.

The storage unit 280, a recording unit for storing the data received from the control unit as multimedia data of a predetermined format; And a storage medium in which the multimedia data of the predetermined format is stored. The storage medium may have a relatively low cost mass storage device such as a hard disk drive.

The illustrated digital television is a short range communication module for performing data communication with an external portable device, but the Bluetooth communication module 290 is applied. However, the digital television shown in FIG. 3 may be replaced with other short range communication means such as a means for RF communication or a USB communication module. It is possible that, if replaced, also falls within the scope of the present invention.

The Bluetooth communication module 290 supports an interface for wireless data communication with a portable device via Bluetooth.

The data distribution unit according to the spirit of the present invention may be implemented to be included in the control unit 210 (for example, implemented by some functional modules of a processor that performs image / sound data processing), or the main portion of the Bluetooth communication module 290. It can be implemented as some function module of the Bluetooth processor that is responsible for the function.

When the data distribution unit receives a distribution instruction from the user through the IR receiver 200 to distribute the multimedia data stored in the storage unit 280 to an external portable device, data format conversion for conforming to the specification of the portable device is performed. Determine whether it is necessary, receive a data format conversion from the user, perform data format conversion and DRM processing on the multimedia data, and transmit the data format to the portable device through the short range communication rate.

As illustrated in FIG. 2, the data format query screen displayed on the display apparatus 270 by the data distribution unit may include information for identifying a corresponding portable device. At this time, the data distribution unit may reduce / compress video data of the corresponding program to fit the screen size of the portable device, and extract and compress only the important signal. Next, the data distribution unit converts / edits the data into a file format suitable for the portable device and wirelessly transmits the data to the portable device through the Bluetooth communication module 290.

Hereinafter, a method of distributing broadcast data stored in the storage unit 280 of the digital television system configured as shown in FIG. 1 by the portable device will be described with reference to FIG. 3. FIG.

3 is a flowchart illustrating a method for distributing multimedia data stored in a digital television system to a portable device according to an exemplary embodiment of the present invention.

The multimedia data is stored in the storage of the digital television. Although the multimedia data is mostly video content, the multimedia data may be applied to other types of multimedia data such as images and sound data.

When the user selects specific multimedia data to be downloaded from the multimedia data stored in the storage unit (S110), the digital television receiving the input is connected to a portable device through a short-range communication means at that time to download a portable device. Search (S120). As the portable device, various digital devices such as a cellular mobile communication terminal, an mp3 player, a game machine, and a video player may be applied.

In order to allow the user to easily select the multimedia data, a list of the multimedia data stored in the storage unit such as the background list shown in FIG. 2 may be displayed before the step S210. Each item of the multimedia data list may include a title, data format, content information, and size of the corresponding multimedia content.

Thereafter, the digital television displays a list of the downloadable portable devices searched on the display device (S130), and receives a selection of the portable device to be downloaded from the user among the portable devices included in the list (S140).

When the portable device to download the corresponding multimedia data is determined according to the user's instruction, it is checked whether the portable device has a reproduction authority with respect to the multimedia data (S150).

Steps S120 to S150 may be replaced by a process of determining whether a specified portable device has a right to play the corresponding multimedia data, and performing the step S160 if there is a right to play, and ending if there is no right. That is, when it is predetermined that the portable device to be downloaded is specified, the search / selection process of the portable device to be downloaded may be omitted.

If there is no reproduction right as a result of performing step S150, the user is notified that there is no reproduction right by using a display device of a digital television, and the like, and the list of step S130 is displayed again.

If there is a reproduction right, it is determined whether the format conversion for the multimedia data to be downloaded is necessary by comparing the format in which the multimedia data to be downloaded is stored in the storage unit with the multimedia format that can be executed in the portable device to be downloaded (S160).

If no format conversion is required, the process proceeds directly to step S200 to perform DRM processing on the selected multimedia data. If format conversion is required, a query screen for format conversion is displayed on the display device of the digital television (S170). The step S170 may also be played on the portable device to be downloaded, and may display a list of all data formats for which the multimedia data to be downloaded may be converted, and allow the user to select one data format from the list. have. In addition, according to the implementation, the most preferable data format among the data formats included in the list may be suggested to the user.

Next, the multimedia data to be downloaded is converted into the selected data format (S190), and the DRM processing operation on the format-converted multimedia data is performed (S200).

In step S190, for example, the MPEG2 format, which is a video format used in a broadcast stream, may be converted into an MPEG4 format or a WMV9 format, which is a format used in a portable device. In this case, in order to prevent an increase in cost, a memory required for data format conversion may be implemented as a virtual buffer formed in the storage medium of the storage unit.

In operation S200, various types of DRM processing may be performed. For example, all or part of the multimedia content may be encrypted, and decrypted and reproduced using an encryption key of the portable device to be downloaded.

Depending on the implementation or according to the DRM policy, steps S190 and S200 may be performed in reverse order.

In the step S210 of transmitting the data format change and the DRM processing-completed multimedia data from the digital television to the portable device, the multimedia data is transmitted through a wired cable such as a USB communication method, or the wireless data is transmitted through a wireless communication channel such as a Bluetooth communication method. It may be implemented to transmit multimedia data.

According to the multimedia data distribution method shown in FIG. 3, an example of operations performed in a digital television system and a portable terminal will be outlined.

The digital television system stores the broadcast program desired by the user as desired. The data stored in this way is converted into a data format desired by the user and transmitted to the mobile terminal through a Bluetooth communication method.

That is, the digital television system reduces / compresses the video data from the audio / video data stored in the storage unit so as to correspond to the screen size of the mobile terminal, and extracts only the important signals from the multi-channel data to increase the compression ratio. The digital television system then DRMs the compressed data and transmits it to the portable terminal via a USB port.

In addition, the digital television system may convert the format of the data according to the data format information input by the user, and then transmit the format to the portable device through the Bluetooth communication module.

Then, the portable terminal can immediately play the multimedia data transmitted from the digital television system.

Although the mobile device has been described as being limited to a mobile terminal such as a cellular mobile communication terminal in the above description, the present invention can be applied to various multimedia devices capable of receiving multimedia data such as a PDA, a PMP player, an MP3 player, and a digital camera.

Preferred embodiments of the present invention are disclosed for purposes of illustration, and those skilled in the art will be able to make various modifications, changes and additions within the spirit of the present invention. Additions should be considered to be within the scope of the following claims.

1 is a structural diagram showing the configuration of a digital television system according to an embodiment of the present invention;

2 is a data format conversion query screen displayed according to the execution of a method for distributing multimedia data according to an embodiment of the present invention.

3 is a flowchart illustrating a method of distributing multimedia data in a digital television according to an embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

200: IR receiving unit 200 210: control unit

220: memory 230: tuner

240: demodulator 270: display device

280: storage unit 290: Bluetooth module

Claims (7)

A method for distributing multimedia data stored in a storage unit of a digital television to a portable device through a short range communication channel, (a) confirming a multimedia distribution right of the portable device connected through the local area communication channel; (b) determining whether data format conversion is required when downloading the multimedia data indicated by the user to the portable device; (c) if data format conversion is required, displaying a data format query screen; (d) converting the format of the multimedia data according to a user's instruction; (e) performing DRM processing necessary for the converted multimedia data; (f) transmitting the DRM processed multimedia data to the portable device; Multimedia data distribution method comprising the. The method of claim 1, Before step (b), And displaying a list of the multimedia data stored in the storage unit. The method of claim 1, In the step (c), And displaying a list of formats that the portable device can reproduce and to which the multimedia data can be converted. The method of claim 1, Before step (a) above, Searching for a portable device capable of distributing multimedia data; And Displaying a list of the searched portable devices Multimedia data distribution method characterized in that it further comprises. The method of claim 1, In the step (d), And converting the image into a resolution format that matches the resolution of the display device of the portable device. A display device for outputting an image; An image processing unit which receives an antenna or a broadcast signal input from outside and performs a necessary image processing and outputs it to the display device; A storage unit for storing multimedia data; A short range communication module for performing data communication with an external portable device; An operation unit for receiving a user's instruction; Upon receiving a user's instruction for distributing multimedia data stored in the storage unit to an external portable device through the operation unit, it is determined whether data format conversion is required to meet the specification of the portable device, and the data format conversion is performed by the user. Approved by the user, the data distribution unit for performing the data format conversion and DRM processing on the multimedia data, and transmits to the portable device through the short-range communication rate Digital television system comprising a. The method of claim 6, The storage unit, A recording unit for storing the data received from the image processing unit as multimedia data of a predetermined format; And Storage medium in which the multimedia data of the predetermined format is stored Digital television system comprising a.

Images