KR101666893B1 - A digital broadcast receiver and a method for processing a service - Google Patents

Abstract

A service processing method in a digital broadcast receiver and a digital broadcast receiver is disclosed. The network interface unit receives the IP packet for transferring the service information from the server, and the storage unit stores the address of the server and authentication information for the account of the server. When the user update command is received, the control unit stores the account Logs out, logs in to an account logged out to the server using the address and authentication information of the stored server, and controls to receive service information from the server. According to the present invention, a real-time broadcasting service and an Internet service can be provided, and updated contents can be easily received and provided to a user.

Digital, broadcasting receiver, network, IP, service

Description

TECHNICAL FIELD [0001] The present invention relates to a digital broadcast receiver and a digital broadcast receiver,

The present invention relates to a service processing method in a digital broadcast receiver and a digital broadcast receiver, and more particularly, to a digital broadcast receiver for processing service information received through an Internet network and a service processing method in a digital broadcast receiver.

Conventional broadcast receivers transmit contents produced by broadcasters through radio wave transmission media such as terrestrial waves, cable or satellite broadcasts, and users are provided with a service through a receiver capable of receiving the transmission media .

However, digital-based digital broadcasting technology has been developed and commercialized in existing analog broadcasting, so that it is possible to use real-time broadcasting, contents on demand (CoD), games, news It is possible to provide various types of content services to users.

An example of content service provision using the Internet network is IPTV (Internet Protocol TV). The IPTV refers to transmitting various information services, moving picture contents, broadcasting, etc. to an user's receiver using an Internet network. The Internet network can be implemented on various types of networks such as an optical fiber network, a coaxial cable network, a fiber to the home (FTTH), a telephone network, and a wireless network based on IP (Internet Protocol).

In the case of the service using the Internet network as described above, unlike general terrestrial broadcasting, bidirectionality can be added and the user can watch the content service he wants to watch at a convenient time.

According to an aspect of the present invention, there is provided a digital broadcasting receiver and a digital broadcasting receiver capable of simultaneously providing a real-time broadcasting service and an Internet service.

According to another aspect of the present invention, there is provided a digital broadcasting receiver and a digital broadcasting receiver capable of easily receiving updated contents.

According to another aspect of the present invention, there is provided a computer-readable recording medium storing a program for causing a computer to execute a service method for a digital broadcast receiver.

According to an aspect of the present invention, there is provided a digital broadcasting receiver including a network interface for receiving an IP packet for transmitting service information from a server, a storage for storing authentication information on an account of the server, And when a user update command is received, log-out of the account logged into the server, login to the server using the address of the server and the stored authentication information, And a control unit for controlling to receive the information. The server may include at least one of a content provider and a service provider. The server may also be a web server.

Preferably, the control unit may execute a browser for processing the service information.

Preferably, the service information may include service information for a real-time broadcast service and service information for an Internet service.

Preferably, the server can provide a function of adding and deleting content through the account. Here, the service information may be information on contents added through the account.

Preferably, the server can provide a YouTube service.

The storage unit may store an Internet service list including at least one of a name of the server, connection information of the server, and guidance information on a service provided by the server. Here, when the user Internet service mode request command is input, the controller may control to display a link for accessing the server using the Internet service list.

Preferably, when the user Internet service request command is input, the control unit accesses a server associated with the inputted user Internet service request command and displays a screen requesting authentication information on the account of the connected server can do.

The digital broadcasting receiver includes: A tuner for receiving a broadcast signal, a demodulator for demodulating the received broadcast signal, a decoder for decoding the demodulated broadcast signal, and a display for displaying the decoded broadcast signal.

According to another aspect of the present invention, there is provided a method of processing a service in a digital broadcasting receiver, the method comprising: receiving an IP packet for transmitting service information from a server; Log-out of the account, log-in to the server using the address of the stored server and stored authentication information, and receiving the service information from the server. The server may include at least one of a content provider and a service provider. The server may also be a web server.

Preferably, the service processing method may further include displaying the service information through a browser.

Preferably, the service information may include service information for a real-time broadcast service and service information for an Internet service.

Preferably, the server can provide a function of adding and deleting content through the account. Here, the service information may be information on contents added through the account.

Preferably, the server can provide a YouTube service.

The service processing method may further include storing an Internet service list including at least one of a name of the server, connection information of the server, and guidance information on a service provided by the server.

Preferably, the service processing method may further include displaying a link for connecting to the server using the Internet service list when the user Internet service mode request command is input.

Preferably, when the user Internet service request command is inputted, the service processing method includes a screen for accessing a server associated with the input user Internet service request command and requesting authentication information for the account of the connected server The method comprising the steps of:

Preferably, the service processing method may further include receiving a user content request command requesting a service indicated by the received service information, and displaying the requested service.

According to the service processing method in the digital broadcasting receiver and the digital broadcasting receiver according to the present invention, it is possible to provide a real-time broadcasting service and an Internet service, and easily receive updated contents and provide the updated contents to a user.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. The configuration and operation of the present invention shown in the drawings and described by the drawings are described as at least one embodiment, and the technical idea of the present invention and its core configuration and operation are not limited thereby.

Although the terms used in the present invention have been selected in consideration of the functions of the present invention, it is possible to use general terms that are currently widely used, but this may vary depending on the intention or custom of a person skilled in the art or the emergence of new technology. Also, in certain cases, there may be a term selected arbitrarily by the applicant, in which case the meaning thereof will be described in detail in the description of the corresponding invention. Therefore, it is to be understood that the term used in the present invention should be defined based on the meaning of the term rather than the name of the term, and on the contents of the present invention throughout.

A digital broadcast receiver means a broadcast receiver capable of receiving digital broadcasts transmitted as digital video and audio signals. Digital broadcasting refers to a broadcasting technology capable of bi-directional operation, reproduction and accumulation because it compresses and outputs a television signal in a digital form in which information signals are encoded and recorded unlike conventional analog broadcasting. Compared to analog broadcasting, such digital broadcasting is strong against noise and has a small data loss, and since it transmits separate error correction information, it is advantageous for error correction and provides a high resolution and clear screen. Also, unlike analog broadcasting, digital broadcasting can receive a broadcasting service from a broadcasting station and provide bidirectional service to provide information to a broadcasting station.

In the present invention, digital broadcasting is used not only for broadcasting through terrestrial, satellite, and cable but also for broadcasting transmitted through an Internet network. That is, digital broadcasting is defined as a concept including IP (Internet Protocol) broadcasting.

Also, in the present invention, a digital broadcast receiver includes a broadcast receiver capable of providing an Internet service to a viewer. Here, the Internet service includes information services such as CoD (Content's on Demand) service, YouTube service, weather, news, local information and search, entertainment services such as game and karaoke, TV mail, TV SMS And communication services, which can be provided through the Internet. Accordingly, the digital broadcast receiver in the present invention includes a network TV, a web TV, and a broadband TV. The broadcasting service may include an Internet service as well as a broadcasting service provided through terrestrial, satellite, and cable.

There may be various system architectures for transmitting digital broadcasts. For example, an Internet Protocol Television (IPTV) system is a system capable of providing various contents using an Internet network. The system can be composed of a server, a network, and a client.

The server of the IPTV includes various servers such as a service discovery and selection server, a streaming server, a contents guide information server, a customer information server, a payment information server, ≪ / RTI >

Among the servers, the streaming server transmits moving picture data encoded by MPEG (Moving Picture Experts Group) 2, MPEG4, etc. stored in the server to a user via a network. A Real-Time Transport Protocol (RTP), an RTP Control Protocol (RTCP), or the like may be used as the protocol for the transmission.

When using the Real-Time Streaming Protocol (RTSP), it is possible to control the playback of the video stream to some extent through a feature called network trick play such as pause, replay, have. The protocols are examples and other real-time transmission protocols may be used according to embodiments.

The content guide information server is a server for providing information on the various contents provided. The content guide information is information corresponding to EPG (Electronic Program Guide) information and includes various kinds of information about the content. The content guide information server stores content guide information data and provides the stored data to a receiver.

The information server for service discovery and selection among the servers provides access information, playback information, and the like to servers providing various contents services such as broadcasting, contents on demand (CoD), and games.

The network system consists of internet based network and gateways. The Internet-based network may be based on IP, such as an optical fiber network, a coaxial cable network, a fiber to the home (FTTH) network, a telephone network, and a wireless network. The gateway can perform not only general data transmission but also multicast group management and quality of service (QoS) management using protocols such as Internet Group Management Protocol (IGMP).

An IPTV receiver is a receiver that receives data transmitted through the Internet and provides it to a user. The receiver includes an IPTV settop, a home net gateway, and an IPTV embedded TV.

In the case of a hybrid IPTV system, various contents of the Internet as well as various existing broadcast contents can be provided. In other words, it is possible to provide various broadcast contents such as terrestrial broadcast, cable broadcast, satellite broadcast, personal broadcast, etc., various Internet video contents, data contents other than video, and the like to users. The contents may be provided in real time or on demand depending on the request.

1 is a diagram schematically illustrating an IPTV system according to an embodiment of the present invention.

Referring to FIG. 1, the IPTV system may be divided into a content provider (CP), a service provider (SP), a network provider (NP), and a user have.

The content provider produces and provides various contents. 1, a terrestrial broadcaster, a cable SO (System Operator) or a MSO (Multiple System Operator), a satellite broadcaster, an Internet broadcasting transmitter (Internet broadcaster).

The service provider provides the contents provided by the contents provider in a service package. For example, the service provider of FIG. 1 packages a first terrestrial broadcast, a second terrestrial broadcast, a cable MSO, a satellite broadcast, various Internet broadcasts, and the like to a user.

The network provider provides a network for providing the service to the user. The user may establish a home network (HNED) to receive the service.

As a means for protecting the content transmitted in the IPTV system, a conditional access and a content protection may be used. As an example of the above-described conditional access and content protection, a scheme such as a cable card (CableCARD) and a DCAS (Downloadable Conditional Access System) can be used.

2 is a schematic diagram of a network TV system according to an embodiment of the present invention.

Referring to FIG. 2, a network TV is a digital broadcast receiver capable of receiving a digital broadcast, and also receiving Internet service and providing it to viewers. Network TV can be named broadband TV and includes web TV. Here, Web TV is a digital broadcasting receiver that receives and provides Internet services based on the Web.

The network TV can receive the Internet service directly from the content provider through the Internet. The network TV can request the retrieval of necessary information from the contents provider and receive the result and provide it to the user. In addition, the network TV can download the content and software requested by the user, play the downloaded content, or execute the downloaded software. It can also receive web pages from content providers and display web pages received via browsers.

In addition, the network TV can receive a broadcasting service from a terrestrial broadcaster through a terrestrial wave as well as receive a broadcasting service via the Internet, and can receive a cable service provider (cable SO (System Operator) MSO (Multiple System Operator)), and may receive a broadcast service from a satellite broadcaster through a satellite.

A digital broadcast receiver can receive a broadcast service from a service provider or a content provider using a unicast or multicast method.

3 and 4 are diagrams schematically showing multicast and unicast methods, respectively.

Referring to FIGs. 3 and 4, the unicast method is a method of transmitting data between one sender and one receiver at a ratio of 1: 1. For example, in a case of a unicast method, when a receiver requests data from a server, the server transmits data to the receiver upon request. The multicast method is a method of transmitting data to a plurality of receivers of a specific group. For example, the server can transmit data to a plurality of pre-registered receivers at once. An Internet Group Management Protocol (IGMP) protocol may be used for the multicast registration.

FIG. 5 is a diagram illustrating a hierarchical structure for a content download service (CDS) broadcast of IPTV.

Referring to FIG. 5, a service provider transmits data contents for CDS to an IPTV receiver using a transmission protocol. The delivered data content for CDS is stored in the storage of IPTV. The stored CDS data contents can be executed by the user's request or the like. In this case, the transmission protocol may be FLUTE (File Delivery over Unidirectional Transport) on the ALC / LCT over IP / UDP and DVB-STP, DVB data / object carousel, FTP (File Transfer Protocol) hypertext transfer protocol), or the like, and the above-mentioned protocols may be used as an example, and other transmission protocols may be used.

If FLUTE is used as the transmission protocol, the presence or absence of the CDS service can be notified to the IPTV receiver through the service search and selection (SD & S), and the details about the contents can be recorded in the metadata of the TV Anytime format, Can be found through.

The CDS data contents may include various kinds of contents such as A / V contents, data contents, and game contents.

As described above, the digital broadcast receiver of the present invention including IPTV can receive various contents, and can output the provided contents to the display screen according to the user's selection.

6 is a block diagram illustrating a configuration of a digital broadcast receiver according to an embodiment of the present invention.

Referring to FIG. 6, the digital broadcasting receiver 600 according to an exemplary embodiment of the present invention may include a separate tuner for receiving digital broadcasting, cable broadcasting, and satellite broadcasting. However, in the present invention, for convenience of description, a description will be made mainly of a process of processing content transmitted using the Internet network.

The digital broadcast receiver 600 includes a network interface unit 602, an IP manager 604, a service delivery manager 606, a demultiplexer 608, a data decoder 610, a decoder 612, a display unit 616, Manager 618, a service information database 622, a service discovery manager 624, a service control manager 626, a metadata manager 628, and a content channel database 630.

The network interface unit 602 receives packets received from the network and transmits the packets to the network. That is, the network interface unit 602 receives an IP packet for transmitting broadcast data from the service providing server through the network. Here, the broadcast data includes content, an update message indicating whether content is updated, metadata, service information data, and software code. In addition, the service information may include service information for a real-time broadcast service and service information for an Internet service.

The IP manager 604 is involved in delivering packets from a source to a destination with respect to packets received in the digital broadcast receiver 600 and packets transmitted from the digital broadcast receiver 600. [ The IP manager 604 classifies the received packets so as to correspond to the appropriate protocols and transmits the packets classified as the service delivery manager 606, the service discovery manager 624, the service control manager 626, and the metadata manager 628 . For example, when the IP manager 604 receives the update message, the IP manager 604 may output the received update message to the service control manager 626. The IP manager 604 may also forward a message requesting the update message output by the service control manager 626 to the service provider.

The service delivery manager 606 is responsible for controlling the received service data. For example, when controlling real-time streaming data, RTP / RTCP (Real-Time Transport Protocol / RTP Control Protocol) may be used. When the real-time streaming data is transmitted using RTP, the service delivery manager 606 parses the received data packet according to the RTP and transmits the parsed data packet to the demultiplexer 608 or the control of the service manager 620 In the content channel database unit 630. [ The service delivery manager 606 controls the network reception information to be fed back to the server providing the service using the RTCP.

The demultiplexer 608 demultiplexes the received packets into audio, video, PSI (Program Specific Information) data, and transmits them to the decoder 612 and the data decoder 610, respectively.

The data decoder 610 decodes service information such as PSI (Program Specific Information). That is, the data decoder 610 receives and decodes the demultiplexed PSI section, the PSIP (Program and Service Information Protocol) section, the DVB-SI (Service Information) section, and the like in the demultiplexer 608.

The data decoder 610 decodes the received sections to create a database of service information, and stores the database of the service information in the service information database unit 622.

The decoder 612 decodes the video data and the audio data received from the demultiplexer 608. To this end, the decoder 612 includes an audio decoder 613 and a video decoder 604. The audio data decoded by the audio decoder 613 is supplied to the user through a speaker (not shown), and the decoded video data and contents are provided to the user through the display unit 616. [

The application manager 618 manages the overall state of the digital broadcast receiver 600, provides a user interface, and manages another manager. To this end, the application manager 618 includes a user interface manager 619 and a service manager 620.

The user interface manager 619 provides a GUI (Graphic User Interface) for the user using an OSD (On Screen Display) or the like, receives a key input from a user, and performs a receiver operation according to the input.

For example, the user interface manager 619 selects a content channel setting input for a predetermined content from a user. When the user interface manager 619 receives the key input regarding the channel change from the user, the user interface manager 619 transmits the key input signal to the service manager 620. Also, upon receiving a key input regarding a specific content channel or a request for update information for a specific content channel from the user, the key input signal is transmitted to the service manager 620.

The user interface manager 619 controls the virtual keyboard or the virtual keypad to be displayed on the screen. The user can select and input a specific virtual key on the virtual keyboard or virtual keypad output by using the direction key and numeric key of the remote controller. For example, the user interface manager 619 may receive a user ID and a password from a user and control the input user ID and password to be transmitted to the corresponding content provider.

The content channel database unit 630 allocates a content channel to the content, determines index data corresponding to the content, stores the index data in association with the allocated content channel information.

For example, if the content is video or audio data 'growth video' stored in the internal memory of the broadcast receiver, the content channel database unit 630 stores 'D / Video / Growth Video ...' And stores it in association with the content channel 'ch 1'.

Also, for example, if the content is video or audio data stored in a network-connected server, the content channel database unit assigns the network address '198.7 // Sejong of Daehang / de // 11 times' Can be stored in association with the content channel 'ch 3'.

For example, if the content is an Internet site 'Yahoo widget', the content channel database unit stores the content channel 'ch 2' assigned to the web site 'http //: yahoo // wizet // ...' You can save about.

On the other hand, according to the embodiment, when the broadcast receiver receives the change command of the content channel from the user, the broadcast receiver determines the index data corresponding to the changed content channel and outputs the corresponding content.

In this case, if the change command of the content channel is an increase or a decrease command of the channel, the index data corresponding to the content of the next or previous content channel stored in the content channel database unit is read, The content can be output.

Also, the content channel database unit 630 may store authentication information for the Internet service list and the account of the server. Here, the Internet service list is a list including information on a content provider or a service provider that provides the Internet service. For example, the Internet service list may include at least one of a name of the server, connection information of the server, and guidance information on the service provided by the server. Here, the connection information of the server may be any one of an Internet address and a URL (Uniform Resource Locator).

When the application manager 618 receives the output command of the content channel from the user, the application manager 618 reads the index data stored in the content channel database unit and outputs the content.

When the application manager 618 receives the change command of the content channel from the user, the application manager 618 reads the index data of the changed channel and outputs the content.

At this time, if the channel change command is a channel increase or decrease input, the broadcast receiver reads the index data corresponding to the content of the next or previous order content channel stored in the content channel database unit, .

On the other hand, when the user selects the content channel mode and selects the output command of the content channel, the application manager 618 can read the index data stored in the content channel database unit 630 and output the content .

The application manager 618 determines whether the channel selected by the user is a content channel or a general broadcast channel. If the channel is determined to be a content channel, the application manager 618 reads the index data stored in the content channel database unit 630, can do.

In addition, the application manager 618 may select the content channel mode, and when receiving the change command of the content channel, the application manager 618 may read the index data corresponding to the changed content channel and output the content command.

Here, the content may be video or audio data stored in the internal memory of the broadcast receiver, the index data may be a directory of the content, the content may be video or audio data stored in a server connected to the broadcast receiver, The data may be a network address of the content, the content may be a predetermined internet site, and the index data may be a web address of the internet site.

The application manager 618 may output a directory or a parent folder of the folder containing the content when a predetermined key input (e.g., a menu command) is selectively input from the output of the content.

In addition, the application manager 618 may output the update information or the change information when new content is updated in a directory or a folder containing the content, or when the content is changed in the directory or folder.

The application manager 618 can control to display information included in the Internet service list when the user Internet service mode request command is input. That is, the application manager 618 can control to display at least one of the name of the server included in the Internet service list, the connection information of the server, and guidance information on the service provided by the server. Here, the connection information can be displayed as a link for connecting to the server. That is, the user can click the connection information displayed on the screen to allow the digital broadcasting receiver to access the server. In addition, a specific picture or icon can be displayed for each server name included in the Internet service list. Here, the user Internet service mode request command can be input through a hot key on the remote controller, via a virtual keypad or a virtual key on the virtual keyboard, and can be input through a specific menu displayed on the screen.

When receiving the user Internet service request command, the application manager 618 accesses the server associated with the received user Internet service request command and controls to display a screen for requesting authentication information on the account of the connected server. Here, when the user clicks the connection information displayed on the screen, the user Internet service request command can be inputted, and when the user clicks the picture or icon of the corresponding server displayed on the screen, the user Internet service request command Can be input.

The display unit 616 outputs the content to the display screen. Further, the display unit 616 displays the image generated by the browser on the screen.

The service manager 620 controls the manager associated with the service, such as the service delivery manager 606, the service discovery manager 624, the service control manager 626 and the metadata manager 628 and the IG-OITF client.

The service manager 620 also creates a channel map of a general broadcast and selects a channel using the channel map according to a key input received from the user interface manager 619. [ The service manager 620 receives the channel service information from the data decoder 610 and sets an audio / video PID (Packet Identifier) of the selected channel in the demultiplexer 608.

The service manager 620 may also execute a browser to process the received service. The browser can display the service information on the screen, and can control the content to be reproduced. The browser may also execute an application, an application associated with the content. In addition, the browser can process the web page provided by the server and display it on the screen. Here, the service information can be provided in the form of a web page from the server.

The service discovery manager 624 provides the information necessary to select a service provider providing the service. Upon receiving a signal regarding the channel selection from the service manager 620, the service discovery manager 624 searches for the service using the information.

The service control manager 626 is responsible for selection and control of services. For example, when a user selects a service such as IGMP or RTSP when selecting a Live Broadcasting service such as an existing broadcasting method and selects a service such as VOD (Video On Demand), RTSP is used to select a service, control . The RTSP protocol may provide a trick mode for real-time streaming. Also, the service control manager 926 can initialize and manage a session through the IMC gateway using an IP Multimedia Subsystem (IMS) and a Session Initiation Protocol (SIP). The protocols are one embodiment, and other protocols may be used, depending on the implementation.

The metadata manager 628 manages the metadata associated with the service and stores the metadata in the service information database 622. [

The service information database unit 622 stores the service information decoded by the data decoder 610, the meta data managed by the meta data manager 628, and information necessary for selecting a service provider provided by the service discovery manager 624 . The service information database unit 622 may store setup data and the like for the system.

The service information database unit 622 and the content channel database unit 630 may be implemented using a nonvolatile RAM (NVRAM) or a flash memory, respectively. The service information database unit 622 and the content channel database unit 630 may include two logically separated regions Lt; / RTI >

The content channel database unit 630 may store content controlled to be stored in a PVR manager (not shown). The PVR manager collects metadata related to the stored content and generates additional information (thumbnail image, etc.) used for the user.

7 is a block diagram illustrating a configuration of a digital broadcast receiver according to another embodiment of the present invention.

7, a digital broadcasting receiver 700 according to another embodiment of the present invention includes a video / audio processing unit 701, an interface unit 750, a storage unit 760, a display unit 770, A control unit 775, and a control unit 780.

The video / audio processing unit 701 processes the input video signal or audio signal so that the video or audio can be output to the display unit 770 and the audio output unit 775 of the digital broadcast receiver 700. To this end, the video / audio processing unit 701 may include a signal input unit 710, a demodulation unit 720, and a signal processing unit 740. The signal input unit 710 may include a tuner unit 711, an A / V input unit 712, a USB input unit 713, a wireless signal input unit 714, and a network unit 715.

The tuner unit 711 selects an RF broadcast signal corresponding to a channel selected by a user from among RF (Radio Frequency) broadcast signals received through an antenna, and outputs the selected RF broadcast signal as an intermediate frequency signal, Conversion. For example, if the selected RF broadcast signal is a digital broadcast signal, it is converted into a digital IF signal (DIF), and if the selected RF broadcast signal is an analog broadcast signal, it is converted into an analog baseband image or voice signal (CVBS SIF). That is, the tuner unit 711 can process a digital broadcast signal or an analog broadcast signal. The analog baseband video or audio signal (CVBS SIF) output from the tuner unit 711 can be directly input to the signal processor 740.

In addition, the tuner unit 711 can receive RF carrier signals of a single carrier according to an Advanced Television System Committee (ATSC) scheme or RF carriers of a plurality of carriers according to a DVB (Digital Video Broadcasting) scheme.

According to another embodiment of the present invention, the digital broadcast receiver 700 may include at least two tuner units. In a case where at least two tuner units are provided, the second tuner unit selects an RF broadcast signal corresponding to a channel selected by the user among the RF broadcast signals received through the antenna, similar to the first tuner unit, Frequency signal or a baseband image or voice signal.

In addition, the second tuner unit may sequentially select RF broadcast signals of all broadcast channels stored through the channel memory function among the received RF broadcast signals, and convert the RF broadcast signals into an intermediate frequency signal, a baseband image, or a voice signal. And the second tuner unit may periodically perform the conversion operation of all the broadcast channels. Accordingly, the digital broadcast receiver 700 can display images of the broadcast signals converted through the first tuner unit, and can provide images of the plurality of channels converted through the second tuner unit in a thumbnail format. In this case, the first tuner unit converts the main RF broadcast signal selected by the user into an intermediate frequency signal, a baseband image, or a voice signal, and the second tuner unit sequentially and periodically selects all the RF broadcast signals except for the main RF broadcast signal To convert it to an intermediate frequency signal or a baseband image or voice signal.

The demodulator 720 receives the digital IF signal DIF converted by the tuner 711 and performs a demodulation operation. For example, when the digital IF signal output from the tuner unit 711 is of the ATSC scheme, the demodulation unit 720 performs 8-VSB (8-Vestigal Side Band) demodulation. As another example, when the digital IF signal output from the tuner unit 711 is a DVB system, the demodulator 720 performs CODDMA (Coded Orthogonal Frequency Division Modulation) demodulation.

Also, the demodulator 720 may perform channel decoding. For this, the demodulator 720 includes a Trellis decoder, a de-interleaver, and a Reed Solomon decoder to perform trellis decoding, deinterleaving, Solomon decoding can be performed.

The demodulation unit 720 may perform demodulation and channel decoding and then output a stream signal TS. At this time, the stream signal may be a signal in which a video signal, a voice signal, or a data signal is multiplexed. For example, the stream signal may be an MPEG-2 TS (Transport Stream) multiplexed with an MPEG-2 standard video signal, a Dolby AC-3 standard audio signal, or the like. Specifically, the MPEG-2 TS may include a header of 4 bytes and a payload of 184 bytes.

The stream signal output from the demodulation unit 720 may be input to the signal processing unit 740. The signal processing unit 740 performs demultiplexing, signal processing, and the like, and then outputs an image to the display unit 770 and outputs a voice to the voice output unit 775.

Further, in the case of a digital broadcasting receiver having at least two tuner units, a corresponding number of demodulators may be provided. The demodulator may be provided separately according to the ATSC scheme and the DVB scheme.

In addition, the signal input unit 710 can connect the external device and the digital broadcast receiver 700. The external device refers to various types of video or audio output devices such as a DVD (Digital Versatile Disk), a Blu ray, a game device, a camcorder, and a computer (notebook). The signal input unit 710 inputs a video, audio, or data signal of an external device to a signal processing unit 740 capable of processing a video signal and a voice signal of the digital broadcast receiver 700.

The A / V input unit 712 of the signal input unit 710 may include an Ethernet terminal, a USB terminal, a Composite Video Banking Sync (CVBS) (Digital Interface) terminal, HDMI (High Definition Multimedia Interface) terminal, RGB terminal, D-SUB terminal, IEEE 1394 terminal, SPDIF terminal, Liquid, HD terminals, and the like. The CVBS terminal, and the S-video terminal may be converted into a digital signal and input to the signal processing unit 740. The digital signal input through the other input terminal may be input to the signal processing unit 740 without performing the analog / digital conversion process.

The USB input unit 713 can input video and audio signals through the USB terminal.

The wireless signal input unit 714 can connect the digital broadcast receiver 700 to a wireless network. The digital broadcast receiver 700 may be connected to the wireless Internet through a wireless signal input unit 714. [ For wireless Internet access, WLAN (Wi-Fi), Wibro (Wireless broadband), Wimax (World Interoperability for Microwave Access), HSDPA (High Speed Downlink Packet Access) In addition, the wireless signal input unit 714 can perform short-range wireless communication with other electronic devices. For example, it can be connected to other electronic devices in accordance with Bluetooth, RFID (Radio Frequency Identification), IrDA (Infrared Data Association), UWB (Ultra Wideband) and ZigBee communication standards.

In addition to the radio signal input unit 714, an Ethernet terminal or a signal input unit 710 may further include a network unit 715 for efficient network connection and management, The receiver 700 can be connected to the network through the PSTN, LAN, CABLE, and the like.

Meanwhile, the signal input unit 710 may be connected to various set-top boxes via at least one of the various terminals described above to perform input / output operations with the set-top box. For example, when the set-top box is a set-top box for an IP (Internet Protocol) TV, the video, audio and data signals processed in the settop box for IPTV can be transmitted to the controller 760, The control unit 760 may transmit the processed signals to the IPTV set-top box.

Therefore, the digital broadcasting receiver according to the present invention can process signals transmitted through a wired or wireless network in addition to broadcast signals through a radio wave medium, signals from external input devices, and the like. That is, the digital broadcast receiver according to the present invention receives broadcast data provided by a service providing server through a network. Here, the broadcast data includes content, an update message indicating whether content is updated, metadata, service information data, and software code. In addition, the service information may include service information for a real-time broadcast service and service information for an Internet service.

The signal processing unit 740 demultiplexes the received stream signal, for example, an MPEG-2 TS, into a video signal, a voice signal, and a data signal, respectively. Also, the signal processing unit 740 can perform image processing of the demultiplexed video signal. For example, if the demultiplexed video signal is a coded video signal, it can be decoded. Specifically, when the demultiplexed video signal is an MPEG-2 standard-coded video signal, it can be decoded by an MPEG-2 decoder. Also, if the demultiplexed video signal is a video signal of the H.264 standard according to the DMB (Digital Multimedia Broadcasting) scheme or DVB-H, it can be decoded by the H.264 decoder.

The signal processor 740 may process the brightness, tint, and color of the video signal. The video signal processed by the signal processing unit 740 is displayed through the display unit 770. Also, the signal processor 740 can perform the voice processing of the demultiplexed voice signal. For example, if the demultiplexed speech signal is a coded speech signal, it can be decoded. Specifically, when the demultiplexed speech signal is an MPEG-2 standard encoded speech signal, it can be decoded by an MPEG-2 decoder. In addition, if the demultiplexed speech signal is a coded voice signal of the MPEG 4 BSAC (Bit Sliced Arithmetic Coding) standard according to a terrestrial DMB (Digital Multimedia Broadcasting) scheme, it can be decoded by an MPEG 4 decoder. Also, if the demultiplexed speech signal is an encoded audio signal of the AAC (Advanced Audio Codec) standard of MPEG 2 according to the satellite DMB scheme or DVB-H, it can be decoded by the AAC decoder.

The signal processor 740 may process a base, a treble, a volume control, and the like.

The voice signal processed by the signal processing unit 740 is output to the voice output unit 775 by voice. In addition, the signal processor 740 can perform data processing of the demultiplexed data signal. For example, if the demultiplexed data signal is a coded data signal, it can be decoded. The encoded data signal may be EPG (Electronic Program Guide) information including broadcast information such as a start time and an end time of a broadcast program broadcasted on each channel. For example, the EPG information may be ATSC-PSIP (ATSC-Program and System Information Protocol) information in the case of the ATSC scheme and DVB-Service Information (DVB-SI) information in case of the DVB scheme . The ATSC-PSIP information or DVB-SI information may be information included in the above-described stream, i.e., the header (4 bytes) of the MPEG-2 TS.

In addition, the signal processor 740 may perform an OSD (On Screen Display) process. Specifically, the signal processing unit 740 performs a signal processing on the basis of at least one of the image-processed video signal and the data-processed data signal, and the user input signal input through the remote control device 200, Various kinds of information can be displayed in graphic or text.

The storage unit 760 may store a program for each signal processing and control in the control unit 780 or may store a video signal, a voice signal, or a data signal subjected to signal processing. In addition, the storage unit 760 may perform a function for temporarily storing video, audio, or data signals input to the signal input unit 710. [

The storage unit 760 may store the Internet service list and may store the authentication information for the account of the server.

The storage unit 760 may be a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (for example, SD or XD memory) RAM, ROM (EEPROM, etc.), and the like. The digital broadcast receiver 700 can reproduce files (moving picture files, still picture files, music files, document files, etc.) stored in the storage unit 760 and provide them to users.

The control unit 780 controls the overall operation of the digital broadcast receiver 700. The control unit 780 can receive signals transmitted from the remote control device 200 through the interface unit 750. [ The control unit 780 determines a command input by the user to the remote control device 200 through the received signal and controls the digital broadcast receiver 700 to correspond to the command. For example, when the user inputs a predetermined channel selection command, the control unit 780 controls the tuner unit 711 such that the selected channel is input through the signal input unit 710. In addition, the signal processor 740 controls the video signal and the audio signal of the selected channel to be processed. In addition, the control unit 740 controls the signal processing unit 740 so that the channel information selected by the user can be outputted through the display unit 770 or the audio output unit 775 together with the processed video signal and audio signal.

As another example, the user can input another kind of video or audio output command through the remote control device 200. [ That is, the user may desire to watch the camera or camcorder image signal inputted through the USB input unit 713 instead of the broadcast signal. The control unit 780 processes the video signal or audio signal input through the USB input unit 713 of the signal input unit 710 through the signal processing unit 740 and outputs the video signal or audio signal to the display unit 770 or the audio output unit 775 Audio processing unit 701 so that the video /

The control unit 780 discriminates the user command input to the user input unit 755 formed in the digital broadcast receiver 700 and controls the digital broadcast receiver 700 to correspond to the user command inputted through the remote control device 200 . For example, the user can input a digital broadcast receiver 700 on / off command, a channel change command, a volume change command, and the like through a user input unit 755. The user input unit 755 may be a button or a key formed in the digital broadcast receiver 700. The control unit 780 can determine whether the user input unit 755 is operated and control the digital broadcast receiver 700 accordingly.

The control unit 780 may also execute a browser to process the received service. The browser can display the service information on the screen, and can control the content to be reproduced. The browser may also execute an application, an application associated with the content. In addition, the browser can process the web page provided by the server and display it on the screen. Here, the service information can be provided in the form of a web page from the server.

8 is a view showing a screen for login.

The digital broadcast receiver can request the user to input a user ID and a password through the screen shown in FIG. In order to use the broadcast service, the user may have to log in to the content provider or the service provider. For example, to use the YouTube service, the user must log in to the server that provides the YouTube service with his account. Also, in order to settle the usage fee for the CoD service, the content provider may request the viewer for the authentication procedure.

In order to input the user ID and password, the user can input letters and numbers using the numeric keys and character keys on the remote control. The user can also input letters and numbers using the virtual keyboard or the virtual keypad displayed on the screen. If characters and numbers are input using a virtual keyboard or a virtual keypad, the digital broadcasting receiver allows the user to select a virtual key included in the virtual keyboard or the virtual keypad using an indicator. That is, the user can use the direction key of the remote controller to move the indicator to the virtual key to be input, and click the selection button of the remote controller to input information of the virtual key to the digital broadcasting receiver.

When the user ID and the password are input, the digital broadcasting receiver can request authentication to the server providing the broadcasting service using the input user ID and password, and store the inputted user ID and password in the storage unit . Here, the server providing the broadcast service may be a content provider or a service provider. When the authentication procedure is successfully completed, the digital broadcast receiver can receive the broadcast service provided by the server and provide the broadcast service to the user.

9 is a view showing an embodiment of an arrangement of keys of a remote controller according to the present invention.

Referring to FIG. 9, the remote control includes a numeric keys 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10, a direction key (Erasure, HanYoung special). The selection key (OK) can be used as a key for inputting a user command. That is, when the user presses the selection key (OK), the control unit 780 receives a command assigned to the selected menu among the menus displayed on the current screen. The hot key (erase) can be used as a key for canceling the information of the inputted virtual key, and the hot key (HanYoung special) can be used as a key for selecting the Korean / English / special character.

The number keys on the remote control can be used as keys for inputting Korean and English characters. When the user presses the hot key (HanYoung special), the numeric key is changed to a key for inputting any of numeric / Korean / English / special characters. The user can input the user ID and the user password by using the numeric keys (1, 2, 3, 4, 5, 6, 7, 8, 9,

The direction keys (up, down, left, right) can be used as a key to input a user movement command. The user can select a specific menu among the menus displayed on the screen and change the position of the cursor displayed on the screen by pressing the direction key (up, down, left, right).

10 is a diagram schematically showing a system configuration for uploading and downloading contents according to an embodiment of the present invention.

Referring to FIG. 10, a user can log in to a server 1010 using a specific account using an Internet-enabled information communication device, and receive a service from the server 1010. Here, the information communication device capable of the Internet may be a digital broadcast receiver 1030 and a computer 1020. [

In addition, log-in refers to a task in which a user enters his or her ID (ID) and password into a host computer or a network, notifies himself / herself, registers and accesses the host computer. Since the computer operating system is designed to support a large number of users at the same time, each user has to give his / her unique ID and password correctly to the system so that the user can only use the system. It does not matter if you use only one host computer during the login process. However, if multiple computers are connected in a network, you must specify the name of the computer you want to use and then log in.

The server 1010 may include at least one of a content provider and a service provider. The server 1010 may also be a web server. The web server may be a computer program that accepts HTTP requests from a web browser client and responds to HTTP in accordance with data content commonly found in a web page such as an HTML document, or may be a computer executing the computer program. In addition, the server 1010 can provide a real-time broadcast service and an Internet service. Here, the Internet service includes a CoD service, an information service, an entertainment service, and a communication service.

For example, the computer 1020 may receive authentication information for the account of the server from the user. Here, the authentication information may be any one of a user ID and a user password. The computer 1020 can log into the server 1010 using the received authentication information.

When the login is successfully completed, the server 1010 can provide the computer 1020 with the right to add and delete the content to the storage area of the server 1010 through the logged-in account. The computer 1020 can upload the content to the personal folder of the logged in account according to a user command, and delete the uploaded content. Here, the personal folder may be a personal contents folder allocated to a specific area of the storage area of the server 1010.

The digital broadcast receiver 1030 can receive authentication information about the account of the server from the user. The digital broadcast receiver 1030 can log in to the server 1010 using the received authentication information. Here, the digital broadcast receiver 1030 may store the address of the server 1010 and the received authentication information.

When the login is successfully completed, the server 1010 can deliver the service information to the digital broadcast receiver 1030. [ Here, the service information may be service information for a real-time broadcast service and service information for an Internet service. The service information for the Internet service may be information about the content stored in the personal folder of the logged-in account. For example, the service information may be a content list including at least one of a content identifier, a content name, a content version, a thumbnail image, and a content download link. In addition, the server 1010 can deliver content stored in a personal folder of an account logged into the digital broadcast receiver 1030. At this time, the content can be delivered simultaneously with the service information, and can be delivered when the digital broadcast receiver 1030 requests the content.

The server 1010 may transmit service information to a web page. In this case, the digital broadcast receiver 1030 may execute a browser to process the received web page.

11 is a view schematically showing a screen displaying a content list.

11, the digital broadcasting receiver 1030 may display information on the screen including the name of the account logged into the server 1010 and the information 1110 included in the received content list. Here, the information 1100 may be a content name, and may be a thumbnail image of the content.

When the user selects a specific content among the contents displayed on the screen using the virtual direction keys 1141, 1142, 1143 and 1144 and inputs a selection key (confirmation) of the remote controller, the digital broadcast receiver 1030 transmits a content request And display the selected content, which is content associated with the received content request command. The content displayed here may be previously downloaded and stored, or may be received via a link included in the content list.

When the user selects the return (1130) menu using the direction key of the remote controller and inputs the selection key (OK) of the remote controller, the user can display the previously displayed menu, which is the digital broadcast receiver 1030. [

12 is a view schematically showing a screen displaying a process of updating a content list.

12, when the user selects update (refresh) 1120 using the direction key of the remote controller and inputs the selection key (confirmation) of the remote controller, the digital broadcast receiver 1030 receives the user update command . The digital broadcast receiver 1030 then logs out the account logged into the server 1010 and performs login to the server 1010 using the stored account and the stored authentication information. Logout here is a task that tells the server that you want to terminate your use of the network and terminate it when you disconnect from the server. Also, the digital broadcast receiver 1030 can display a screen informing that the updating is being performed as shown in FIG.

13 is a view schematically showing a screen displaying an updated content list.

Referring to FIG. 13, the digital broadcast receiver 1030 receives an updated content list from the server 1010. FIG. The digital broadcast receiver 1030 can display the information 1310 included in the updated content list on the screen. Here, the digital broadcast receiver 1030 can receive the contents together with the updated contents list, and can store the received contents.

FIG. 14 is a flowchart illustrating a service processing method according to an exemplary embodiment of the present invention. Referring to FIG.

Referring to FIG. 14, the computer 1420 performs login to the server 1410 with an account of the server 1410 (S1400). Here, the computer 1420 may input authentication information on the account and perform log-in using the received authentication information.

If the login is successfully completed, the computer 1420 uploads the content to the personal folder of the account (S1405). The computer 1420 uploads one or more contents to the server 1410 according to user commands.

The digital broadcast receiver 1430 performs login to the server 1410 with the account (S1410). Here, the digital broadcast receiver 1430 can receive authentication information for the account from the user and log in using the received authentication information. The digital broadcast receiver 1430 may also store the address of the server 1410 and authentication information for the account.

If the login is successfully completed, the digital broadcast receiver 1430 downloads the content stored in the personal folder of the account from the server 1410 (S1415). Here, the digital broadcast receiver 1430 can receive the service information from the server 1410, and the digital broadcast receiver 1430 can download the contents stored in the personal folder of the account based on the received service information. Here, the service information may be a content list including information on contents stored in a personal folder of the account.

The computer 1420 deletes the content uploaded to the personal folder of the account or additionally uploads the content (S1420).

The digital broadcast receiver 1430 receives the user update command (S1425). Here, the user update command may be input through the update menu 1120 shown in FIG.

When the user update command is input, the digital broadcast receiver 1430 logs out the account (S1430). The digital broadcast receiver 1430 then logs into the account 1410 using the stored server address and stored authentication information (S1435).

If the login is successfully completed, the digital broadcast receiver 1430 receives the service information (S1440). In this case, the service information includes information indicating that the content has been deleted or added in the personal folder of the account in step S1420.

The digital broadcast receiver 1430 requests content based on the received service information (S1445). The digital broadcast receiver 1430 receives the content (S1450). Here, the digital broadcast receiver 1430 may receive the content associated with the input user content request command from the server 1410 when the user content request command is input.

If the content associated with the user content request command is stored, the digital broadcast receiver 1430 displays the received content in step S1455 without performing steps S1445 and S1450. Can be displayed.

15 is a flowchart illustrating a service processing method according to another exemplary embodiment of the present invention.

Referring to FIG. 15, the digital broadcasting receiver stores an Internet service list including at least one of connection information of a server and service information provided by a server (S1500). Here, the connection information of the server and the guidance information on the service provided by the server can be stored at the time of shipment of the digital broadcasting receiver, can be received from the service provider, and can be periodically updated. The server may include at least one of a content provider and a service provider, may be a web server, and may provide a YouTube service. The service may include a real-time broadcast service and an Internet service.

The digital broadcasting receiver checks whether the user Internet service mode request command is input (S1505). Here, the user Internet service mode request command can be inputted as information of the hot key of the remote controller, and can be inputted when the selection key (OK) of the remote controller is pressed while a specific menu among the menus displayed on the screen is selected.

When the user Internet service mode request command is inputted, the digital broadcasting receiver displays a link for connecting to the server using the Internet service list (S1510). Here, the Internet service list may include at least one of a name of the server, connection information of the server, and guidance information on the service provided by the server. Also, the displayed link can be displayed as an icon and a thumbnail image, and can be displayed in the name of the server.

The digital broadcast receiver checks whether a user Internet service request command is input (S1515). Here, the user Internet service request command can be inputted when the user presses the selection key (OK) of the remote controller while the specific link among the displayed links is selected by using the direction key of the remote controller.

When the user Internet service request command is input, the digital broadcast receiver accesses the server associated with the inputted user Internet service request command (S1520). Here, the server associated with the user Internet service request command may be the server indicated by the link selected in step S1515.

The digital broadcasting receiver displays a screen for requesting authentication information of an account of the connected server (S1525). Here, the digital broadcast receiver can display the screen shown in FIG. The authentication information may also be a user ID and a user password.

The digital broadcasting receiver checks whether authentication information is input (S1530). Here, the authentication information may be input through the remote controller shown in FIG. 9, and may be input through the virtual keyboard and the household keypad displayed on the screen.

When the authentication information is input, the digital broadcast receiver performs login to the server using the input authentication information (S1535). Here, the digital broadcasting receiver can store the address of the server and the inputted authentication information. Also, the digital broadcast receiver can store the address of the server and the inputted authentication information in association with each other so that the digital broadcasting receiver can search another one through the address of the server and the inputted authentication information.

If the login is successfully completed, the digital broadcasting receiver receives the service information from the server (S1540). Here, the service information includes service information for a real-time broadcast service and service information for an Internet service. The service information for the Internet service may include a content list including information about the content stored in the personal folder of the connected account. Here, the digital broadcasting receiver can receive more contents uploaded to the server with the logged-in account. The server can transmit the content together with the service information, and can transmit the content when receiving the content request transmitted based on the service information. The server can also provide service information only once at login.

The digital broadcast receiver checks whether a user update command is input (S1545). Here, the user update command may be input through the update menu 1120 shown in FIG.

When the user update command is input, the digital broadcast receiver logs out the account logged into the server, and logs in the account logged out to the server using the address and authentication information of the stored server (S1550).

If the login is successfully completed, the digital broadcast receiver receives the service information from the server (S1555). Here, when the content stored in the server is updated, the service information includes information on the updated content. Also, the digital broadcast receiver can display the received service information on the screen as shown in FIG.

The digital broadcast receiver checks whether a user content request command is input (S1560). Here, the user content request command is a command for requesting at least one service included in the received service information. Also, the user content request command can be inputted when the selection key (confirmation) of the remote controller is pressed in a state where information about specific contents among information 1110 and 1310 shown in Figs. 11 and 13 is selected.

The digital broadcast receiver displays the content associated with the user content request command (S1565). Here, the content associated with the user content request command may be the content selected in step S1560. The digital broadcasting receiver displays the stored contents when the contents are stored, and receives and displays the contents from the server when the contents are not stored.

The present invention can also be embodied as computer-readable codes on a computer-readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer apparatus is stored. Examples of the computer-readable recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and may be implemented in the form of a carrier wave (for example, transmission via the Internet) . The computer-readable recording medium may also be distributed to networked computer devices so that computer readable code can be stored and executed in a distributed manner.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation in the embodiment in which said invention is directed. It will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the appended claims.

1 is a diagram schematically illustrating an IPTV system according to an embodiment of the present invention,

2 is a schematic view of a network TV system according to an embodiment of the present invention,

Figure 3 is a schematic representation of a multicast scheme,

Figure 4 is a schematic representation of a unicast scheme,

FIG. 5 is a diagram showing a hierarchical structure for a content download service (CDS)

6 is a block diagram illustrating a configuration of a digital broadcast receiver according to an embodiment of the present invention.

7 is a block diagram illustrating a configuration of a digital broadcast receiver according to another embodiment of the present invention.

8 is a view showing a login screen,

9 is a view showing an embodiment of an arrangement of keys of a remote controller according to the present invention,

10 is a diagram schematically showing a system configuration for uploading and downloading contents according to an embodiment of the present invention,

11 is a view schematically showing a screen displaying a content list,

12 is a view schematically showing a screen displaying a process of updating a content list,

13 is a view schematically showing a screen displaying an updated content list,

FIG. 14 is a flowchart illustrating a service processing method according to an exemplary embodiment of the present invention,

15 is a flowchart illustrating a service processing method according to another exemplary embodiment of the present invention.

Claims (24)

A network interface for receiving an IP packet carrying service information from a server; A storage unit for storing an address of the server and authentication information for an account of the server; And Log-out of an account logged in to the server, log-in to the server using the address of the stored server and the stored authentication information when the user update command is received, and receiving the service information from the server And a control unit for controlling the receiving unit to receive, The server A content server, a content provider, and a service provider, the web server being provided with a function of adding and deleting content through the account, The service information is information on contents added through the account, Wherein, A list of Internet services including at least one of a name of the server, connection information of the server, and guidance information on a service provided by the server, Wherein, And controlling, when the user Internet service mode request command is input, to display a link for accessing the server using the Internet service list Digital broadcast receiver. delete delete The apparatus of claim 1, And executes a browser for processing the service information. The method according to claim 1, Wherein the service information includes service information for a real-time broadcast service and service information for an Internet service. delete delete delete delete delete The method according to claim 1, Wherein, When the user Internet service request command is inputted, controls to display a screen for accessing a server associated with the inputted user Internet service request command and requesting authentication information on the account of the connected server. Broadcasting receiver. The method according to claim 1, A tuner for receiving a broadcast signal; A demodulator for demodulating the received broadcast signal; A decoding unit decoding the demodulated broadcast signal; And And a display unit for displaying the decoded broadcast signal. delete delete delete delete delete delete delete delete delete delete delete delete

Images