KR20110092451A - Digital broadcast receiver and method for displaying a image - Google Patents

Abstract

PURPOSE: A digital broadcast receiver and method for displaying an image are provided to display a screen ratio of a screen of a received screen even if information related to the screen ratio of an image is omitted. CONSTITUTION: A receiver receives a broadcast signal. A demultiplexer(510) demultiplexes the received broadcast signal to an audio signal, a video signal, and a data signal. A decoder(512) decodes the video signal. The decoder confirms whether AFD(Active Format Description) data exists in the decoded video signal or not. If the AFD data does not exists, the decoder controls screen ratio of an image frame included in the decoded video signal based on the AFD data set previously. The display unit displays the controlled image frame.

Description

Digital broadcast receiver and method for displaying a image}

The present invention relates to a digital broadcast receiver and an image display method, and more particularly, to a method for adjusting and displaying an aspect ratio of an image in a digital broadcast receiver.

The broadcasting receiver transmits content produced by a broadcaster through a radio wave transmission medium such as terrestrial, cable, or satellite broadcasting, and the user is serviced by viewing through a receiver capable of receiving the respective delivery media.

However, as digital-based digital broadcasting technology has been developed and commercialized in existing analog broadcasting, real-time broadcasting, contents on demand, games, and news using Internet networks connected to homes in addition to existing radio waves or wired cable media. It is now possible to provide a variety of content services to the user.

An example of providing a content service using the Internet network is IPTV (Internet Protocol TV). The IPTV transmits various information services, video contents, and broadcasts through an internet network and provides them to the receiver of the user. The Internet network may be implemented on various types of networks such as an optical cable network, a coaxial cable network, a fiber to the home (FTTH), a telephone network, and a wireless network based on an Internet Protocol (IP).

In the case of the service using the Internet network as described above, unlike general terrestrial broadcasting, the interactivity may be added, and the user may watch a content service that he / she wants to see at a convenient time.

As various broadcasting services are provided, the information is displayed on a TV screen when providing information on the broadcasting service to a user of the broadcasting receiver, or when setting or changing the setting and request for the broadcasting service, display setting, audio setting, or the like. It uses a method using on-screen display (OSD).

An object of the present invention is to provide a digital broadcast receiver and an image display method for appropriately adjusting and displaying an aspect ratio of an image even when information on an aspect ratio of an image is missing.

Another object of the present invention is to provide a digital broadcast receiver and an image display method capable of adjusting an aspect ratio of an image according to a user's taste.

Another object of the present invention is to provide a computer-readable recording medium having recorded thereon a program for executing an image display method on a computer.

In order to achieve the above technical problem, a digital broadcast receiver according to the present invention includes a receiver for receiving a broadcast signal, a demultiplexer for demultiplexing the received broadcast signal into an audio signal, a video signal, and a data signal, and the video signal. Decodes the data, checks whether there is Active Format Description (AFD) data in the decoded video signal, and if the AFD data does not exist, includes it in the decoded video signal based on preset AFD data. A decoder for adjusting the aspect ratio of the adjusted image frame, and a display unit for displaying the adjusted image frame.

Preferably, the preset AFD data may be previously stored AFD data.

Preferably, the digital broadcast receiver further includes an interface unit for receiving an AFD setting command and a control unit for setting the preset AFD data based on the received AFD setting command.

Preferably, the preset AFD data may be set for each virtual channel.

Advantageously, said digital broadcast receiver further comprises an audio decoder for decoding said audio signal, and a data decoder for decoding said data signal.

Preferably, the receiver has a tuner unit for tuning a broadcast signal including the broadcast signal received through at least one of a cable and an antenna, and a demodulator for demodulating the received broadcast signal.

Preferably, the receiving unit has a network interface unit for receiving an IP (Internet Protocol) packet including the broadcast signal.

Preferably, the video decoder may adjust the aspect ratio of the image frame based on the AFD when the AFD data exists.

In accordance with another aspect of the present invention, there is provided a video display method according to the present invention, the method including receiving a broadcast signal, demultiplexing the received broadcast signal into an audio signal, a video signal, and a data signal, and decoding the video signal. Determining whether there is active format description (AFD) data in the decoded video signal; and in the case where the AFD data does not exist, the decoded video signal is included in the decoded video signal. Adjusting the aspect ratio of the image frame and displaying the adjusted image frame.

Preferably, the preset AFD data may be previously stored AFD data.

The image display method may further include receiving an AFD setting command and setting the preset AFD data based on the received AFD setting command.

Preferably, the preset AFD data may be set for each virtual channel.

Advantageously, said image display method further comprises decoding said audio signal and decoding said data signal.

Preferably, the broadcast signal may be received through at least one of a cable and an antenna.

Preferably, the broadcast signal may be delivered through an Internet Protocol (IP) packet.

The method may further include adjusting an aspect ratio of the image frame based on the AFD data when the AFD data exists.

According to the digital broadcasting receiver and the image display method according to the present invention, since the alternate AFD is set when the AFD data is dropped by setting the alternate Active Format Description (AFD) data, the received image is received even when the information related to the aspect ratio of the image is missing. The aspect ratio of the screen may be properly adjusted and displayed, and the image may be displayed at an aspect ratio suitable for a user's taste.

1 is a diagram schematically showing an IPTV system according to an embodiment of the present invention;
2 is a diagram schematically illustrating a network TV system according to an embodiment of the present invention;
3 is a schematic diagram of a multicast scheme,
4 is a diagram schematically illustrating a unicast scheme;
5 is a block diagram showing the configuration of a preferred embodiment of a digital broadcast receiver according to the present invention;
6 is a diagram illustrating an embodiment method for adjusting the aspect ratio of an image frame according to the present invention;
7 illustrates a method of another embodiment for adjusting the aspect ratio of an image frame according to the present invention;
8 is a table showing definition values of AFD data;
9 is a diagram illustrating an aspect ratio of an adjusted image frame according to a value of AFD data when an aspect ratio value is 16: 9;
FIG. 10 is a diagram illustrating an aspect ratio of an adjusted image frame according to the value of AFD data when the aspect ratio value is 4: 3, and
11 is a flowchart illustrating a process of performing a preferred embodiment of the image display method according to the present invention.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described. At this time, the configuration and operation of the present invention shown in the drawings and described by it will be described as at least one embodiment, by which the technical spirit of the present invention and its core configuration and operation is not limited.

The terms used in the present invention have been selected as general terms widely used as possible in consideration of the functions in the present invention, but may vary according to the intention or custom of a person skilled in the art or the emergence of a new technology. In addition, in certain cases, there is also a term arbitrarily selected by the applicant, in which case the meaning will be described in detail in the description of the invention. Therefore, it is intended that the terms used in the present invention should be defined based on the meanings of the terms and the general contents of the present invention rather than the names of the simple terms.

The digital broadcast receiver refers to a broadcast receiver capable of receiving digital broadcast transmitted by digital video and audio signals. Here, unlike conventional analog broadcasting, digital broadcasting refers to a broadcasting technology capable of two-way operation, reproduction, and accumulation because the television signal is compressed and exported in a digital form that encodes and records information signals. Compared to analog broadcasting, such digital broadcasting is more resistant to noise, has a lower data loss, and transmits additional error correction information, which is advantageous for error correction, and provides a high resolution and clear picture. In addition, unlike analog broadcasting, digital broadcasting is an interactive service capable of receiving a broadcasting service from a broadcasting station and providing information to the broadcasting station.

In the present invention, the digital broadcast is used as a concept that includes not only broadcasts transmitted through terrestrial waves, satellites and cables, but also broadcasts transmitted through Internet networks. That is, digital broadcasting is defined as a concept including IP (Internet Protocol) broadcasting.

In addition, in the present invention, the digital broadcast receiver includes a broadcast receiver capable of providing an Internet service to a viewer. The Internet service includes content services such as CoD (Content's on Demand), YouTube service, weather, news, local information and search, entertainment services such as games and karaoke, TV mail, TV SMS (Short Message Service), etc. It means a service that can be provided through the Internet, such as a communication service. Accordingly, in the present invention, the digital broadcast receiver includes a network TV, a web TV and a broadband TV. In addition, the broadcast service may include an internet service as well as a broadcast service provided through terrestrial, satellite, and cable.

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

The servers of the IPTV are servers that perform various functions such as service discovery and selection server, streaming server, contents guide information server, customer information server, and payment information server. It can be configured as.

Among the servers, the streaming server transmits video data encoded in the stored Moving Picture Experts Group (MPEG) 2, MPEG4, etc. to the user through a network. As a protocol for the transmission, a Real-Time Transport Protocol (RTP), a RTP Control Protocol (RTP), or the like may be used.

In case of using Real-Time Streaming Protocol (RTSP), video stream playback can be controlled to some extent through a function called network trick play such as pause, replay, and stop. . The protocols are one example and other real time transmission protocols may be used depending on the implementation.

The content guide information server is a server that provides information on the various contents provided. The content guide information is information corresponding to electronic program guide (EPG) information and includes various information about content. The content guide information server stores content guide information data, and provides the stored data to the receiver.

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

The network system consists of an internet based network and gateways. The Internet-based network may use various types of networks such as an optical cable network, a coaxial cable network, a fiber to the home (FTTH), a telephone network, a wireless network, and the like based on IP. In addition to general data transfer, the gateway may perform multicast group management and quality of service (QoS) management using protocols such as Internet Group Management Protocol (IGMP).

A receiver of an IPTV is a receiver capable of receiving data transmitted through an internet network and providing the same to a user. The receiver includes an IPTV settop, a homenet gateway, an IPTV embedded TV, and the like.

In the case of a hybrid IPTV system, various contents of the Internet may be provided as well as various existing broadcasting contents. That is, the user can provide various broadcasting contents such as terrestrial broadcasting, cable broadcasting, satellite broadcasting, personal broadcasting, various internet video contents, data contents other than video, and the like. The contents may be provided in real time or may be provided on demand.

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

Referring to FIG. 1, in terms of providing a content service, 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. As shown in FIG. 1, the content provider includes a terrestrial broadcaster, a cable system operator or a multiple system operator, a satellite broadcaster, and an internet broadcaster. Internet broadcaster).

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

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

Conditional access, content protection, or the like may be used as a means for protecting the content transmitted from the IPTV system. As one example for the above-mentioned restriction reception or content protection, a method such as a cable card or a downloadable conditional access system (DCAS) may be used.

2 is a diagram schematically illustrating 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 digital broadcasts and receiving and providing Internet services to viewers. Network TV may be referred to as broadband TV and includes web TV. The web TV is a digital broadcast receiver that receives and provides an internet service based on the web.

The network TV may receive an Internet service directly from a content provider via the Internet. The network TV may request a search for the necessary information from the content provider and receive the result and provide it to the user. In addition, the network TV may download the content and software requested by the user, and may play the downloaded content or execute the downloaded software. It may also receive a web page from a content provider and display the web page received through a browser.

In addition, the network TV may not only receive a broadcast service through the Internet, but also receive a broadcast service from a terrestrial broadcaster through terrestrial, and may use a cable system operator (cable system operator) or a cable. A broadcast service may be received from a multiple system operator (MSO), or a broadcast service may be received from a satellite broadcaster through a satellite.

The digital broadcast receiver may receive a broadcast service from a service provider or a content provider using a unicast or multicast scheme.

3 and 4 schematically illustrate multicast and unicast schemes, respectively.

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

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

The digital broadcast receiver of FIG. 5 represents a receiver that can receive all IPTV services, cable broadcasts, terrestrial broadcasts, and satellite broadcasts based on IP. The receiver of FIG. 5 may be implemented to receive only an IPTV service or only a cable broadcast according to an embodiment. In addition, the cable card of FIG. 5 may be referred to as another name according to the above embodiment.

The receiver of FIG. 5 includes an IPTV module and a legacy TV module. The IPTV module is a module that processes an IPTV broadcast service. Here, the IPTV broadcasting service means a broadcasting service delivered through an IP packet. The IPTV module also includes an OS, middleware, applications, and user interface for processing the IPTV broadcast service. The user interface is an IPTV module that provides On Screen Display (OSD) and channel zapping.

In addition, the legacy TV module is a module that processes a broadcast service received through at least one of cable, terrestrial wave, and satellite. Here, the broadcast service received through at least one of the cable, the terrestrial wave, and the satellite is defined as a legacy broadcast service. The legacy TV module includes an OS, middleware, applications, and a user interface for handling legacy broadcast services. The user interface is a legacy TV module that provides On Screen Display (OSD) and channel zapping.

The receiver of FIG. 5 may include a host 500 and a cable card 520. When not using a separate limited reception system, the receiver may include only a host (HOST) 500.

The host 500 includes a first tuner 502, a second tuner 504, a demodulator 506, a multiplexer 508, a demultiplexer 510, A decoder 512, a network interface 514, a network unit 516, a parser 518, a controller 522, a downloadable cas (DCAS) unit ( 524, a digital video recorder (DVR) controller 526, a content encryption unit 528, a storage interface 530, a storage 532, a display unit 534 and interface 536.

The cable card 520 may be a single stream card capable of processing only one stream or a multi stream card capable of simultaneously processing a plurality of streams.

The receiver may be an open cable method in which a cable card 520 including a conditional access (CA) system is separated from a main body. The cable card 520 may also be referred to as a point of deployment (POD) module, and may be installed in a main body slot of the receiver. It can be manufactured to be removable. The main body into which the cable card 520 is inserted is also referred to as a host. In this case, the cable card 520 and the host 500 are collectively referred to as a receiver.

The network connector 501 connects the external network and the receiver. For example, the receiver may be connected to an external IP network. For example, in the case of using a multimedia over coax alliance (MoCA), an IP-based network may be constructed and connected on a coaxial cable network. Alternatively, you can connect to an external network using a DOCSIS modem, or connect to an external network using a wireless relay that connects to a wireless internet network, or a wired relay that connects to a wired internet network such as a wired ADSL repeater. It may be. The connection example with the external network is an embodiment, and which one to use may vary depending on how it is connected to the external network.

The first tuner 502 is a terrestrial A / V (Audio / Video) broadcast transmitted through an antenna or a cable A / V broadcast transmitted in an in-band through a cable connected to the network connection unit 501. Only a specific channel frequency is tuned and output to the demodulator 506.

In this case, the terrestrial broadcast and the cable broadcast have different transmission methods, and thus the demodulation method in the demodulator 506 is different. For example, terrestrial A / V broadcasting is modulated and transmitted in VSB (Vestigial Sideband Modulation) scheme, and cable A / V broadcasting is modulated and transmitted in quadrature amplitude modulation (QAM) scheme. Therefore, if the channel frequency tuned in the first tuner 502 is a terrestrial broadcast, the demodulator 506 demodulates in the VSB scheme, and if the cable is broadcast, the demodulated signal is demodulated in the QAM scheme.

The second tuner 504 tunes only a specific channel frequency of the cable A / V broadcast transmitted in the in-band through a cable connected to the network connection unit 501 and outputs it to the demodulator 506.

A signal of different channels may be tuned and transmitted to the demodulator 506 using the first tuner 502 and the second tuner 504. Alternatively, different A / V streams of the same channel as the first tuner 502 may be tuned and transmitted to the demodulator 506. For example, the first tuner 502 may tune the stream of the main picture, and the second tuner 504 may tune the stream of the picture in picture (PIP). When the digital video signal is stored using a digital video recorder (DVR) or the like, the first and second tuners 502 and 504 may be used to watch and record the video signals while simultaneously watching and recording the video signals. It may be.

The demodulator 506 demodulates the received signal and transmits it to the multiplexer 508. The multiplexer 508 may multiplex and output the signals input from the demodulator 506 and the parser 518. For example, the main image tuned and demodulated in the first tuner 502 and the PIP image tuned and demodulated in the second tuner 504 may be multiplexed and output. Alternatively, according to an embodiment, images of other channels may be multiplexed, or may be multiplexed with a signal output from the parser 518.

If the signal output from the multiplexer 508 is a terrestrial broadcast signal, the input signal is output to the demultiplexer 510. If the cable broadcast or IPTV broadcast signal is output, the demultiplexer (510) 510). The cable card 520 includes a conditional access (CA) system for copy protection and limited access to high value-added broadcast content, and is also referred to as a point of deployment (POD) module.

That is, the cable card 520 descrambles the received broadcast signal and outputs the descrambled signal to the demultiplexer 510. If the cable card 520 is not mounted, the A / V broadcast signal output from the multiplexer 508 is directly output to the demultiplexer 510. In this case, the scrambled A / V broadcast signal may not be descrambled and thus may not be normally viewed.

The demultiplexer 510 divides the input broadcast signal into a video signal, an audio signal, and a data signal and outputs the same to the decoder 512. Decoder 512 decodes the video signal, audio signal and data signal. To this end, it may include a video decoder (not shown), an audio decoder (not shown) and a data decoder (not shown).

The video decoder restores the compressed video signal through the video decoding algorithm to the original signal and outputs the same to the display unit 534 for display.

The audio decoder restores the compressed audio signal to the original signal through an audio decoding algorithm and outputs the original audio signal to the display unit 534 for display.

The data decoder decodes the data signal and outputs the decoded data to the DVR controller 526 or the storage 532. The data decoder decodes service information such as program specific information (PSI). That is, the data decoder filters the demultiplexed data signal by the demultiplexer 508 into a PSI section, a Program and Service Information Protocol (PSIP) section, a Service Information (DVB-SI) section, and the like. Decode the Program and Service Information Protocol (PSIP) section or the Service Information (DVB-SI) section. To this end, the data decoder may include a section filter (not shown) and a data parser (not shown).

In addition, the data decoder 510 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 522.

The DVR controller 526, the content encryption unit 528, the storage interface unit 530, and the storage unit 532 store the received digital data or play the stored data. The DVR controller 526 may store a video signal and an audio signal selected from data output from the demultiplexer 510, store data output from the decoder 512, or select among stored data under the control of the controller 522. Control to reproduce video data and the like.

The content encryption unit 528 encrypts and outputs the data to be stored, or restores and outputs the encrypted and stored data. The encryption unit 528 may not be used depending on implementation. Here, the content or program data stored by the DVR controller 526 is called a recording. That is, the recording may include stored video data or audio data under the control of the DVR controller 526, and may further include additional data necessary for reproducing the stored video data or audio data.

The storage interface unit 530 performs a data input / output interface with the storage unit 532, and the storage unit 532 stores the input data.

The storage unit 532 may store a program for processing and controlling each signal in the controller 522, may store a video signal, an audio signal, or a data signal that has been processed, and may store service information. In addition, the storage unit 532 may store information for reserved recording of a broadcast program and information for managing recordings.

The storage unit 532 may be composed of one physical storage medium, may be composed of a plurality of storage media, and in the case of a plurality of storage media, the storage interface unit 530 may be configured in plural. In addition, the storage unit 532 may include a flash memory type, a hard disk type, a multimedia card micro type, and a card type memory (for example, SD or XD memory). The storage medium may be implemented as at least one type of storage medium such as RAM, EMPROM, or the like.

The controller 522 controls the overall operation in the host 500. The controller 522 may receive a signal transmitted from the remote controller 550 through the interface unit 536. The controller 522 processes the received signal to determine a command input by the user to the remote controller 550 and controls the host 500 to correspond thereto. For example, when a user inputs a predetermined channel selection command, the controller 522 may control the first tuner 502 or the second tuner 504 to receive the selected channel through the first tuner 502 or the second tuner 504. ). In addition, the decoder 512 is controlled to process the video signal and the audio signal of the selected channel. In addition, the controller 522 controls the decoder 512 to be output through the display unit 534 together with the video signal and the audio signal processed by the channel information selected by the user.

As another example, the user may input another type of video or audio output command through the remote controller 550. That is, the user may want to watch the recording stored in the storage 532 instead of the broadcast signal. In this case, the controller 522 may control the DVR controller 526 to play the recording.

The controller 522 may determine a user command input to a user input unit (not shown) formed in the host 500 in addition to the command input through the remote controller 550 and control the host 500 to correspond thereto. For example, the user may input an on / off command, a channel change command, a volume change command, or the like of the host 500 through the user input unit. The user input unit may be formed of a button or a key formed on the host 500. The controller 522 may determine whether the user input unit is operated and control the host 500 accordingly.

In addition, the controller 522 may execute a browser to process the received service. The browser may display the service information and control the content to be played back. The browser can also run applications, applications associated with content. The browser may process and display a web page provided by the server on the screen. The service information may be provided in the form of a web page from the server.

In addition, the controller 522 sets the alternative AFD, and when there is no active format description (AFD) data in the decoded video signal, the decoder 512 determines the aspect ratio of the image frame included in the video signal decoded by the alternative AFD. Control to adjust. Herein, the controller 522 may set the replacement AFD according to the AFD setting command input from the interface unit 536. In addition, the controller 522 may set the AFD included in the previously received video signal as the replacement AFD. That is, the controller 522 may set the AFD included in the most recently decoded video signal as the replacement AFD.

The DCAS unit 524 may download and store a CA system from the transmitting server, and performs a CA according to an appropriate CA system among the stored CA systems. The controller 522 controls the interface between the host 500 and the cable card 520 and data processing of the host 500.

The network interface unit 514 receives an Ethernet frame packet transmitted to a specific IP address among the signals received through the network connection unit 501 and transmits it to the network unit 516. That is, the network interface unit 502 receives an IP packet for transmitting broadcast data from a service providing server through a network. The broadcast data includes content, update messages indicating whether to update the content, metadata, service information data, and software code. In addition, the service information may include service information for the real-time broadcast service and service information for the Internet service. The specific IP address may be an IP address of the host itself or an IP address of the cable card. In addition, the service providing server may be a content provider or a service provider.

Alternatively, the network interface unit 514 receives data according to bidirectional communication (for example, application for a paid program, status information of a receiver, user input, etc.) from the network unit 516 to receive an external connection through the network connection unit 501. To the network.

In the receiver of FIG. 5, an IPTV broadcast signal, a Video On Demand (VOD) signal, or an Out Of Band (OOB) message signal according to an IP protocol may be received through the network interface unit 514. In case of existing cable broadcasting, system information (SI), emergency alert system (EAS), eXtended Application Information Table (XAIT), CA system information using DSG (DOCSIS Settop Gateway) or OOB (Out Of Band) Receive OOB messages such as various cable card control information.

In the receiver of FIG. 5, a DOCSIS modem, an OOB tuner, or the like may be provided in a host to receive the OOB message. For example, an OOB message may be received using one of an IP method and an OOB method, and an OOB message may be received using one of an IP method, a DSG method, and an OOB method.

When receiving an OOB message using one of the IP method and the OOB method, an OOB modem, a demodulator, etc. are further required in the receiver as shown in FIG. When receiving an OOB message using one of an IP method, a DSG method, and an OOB method, a switching unit for selecting a DOCSIS modem, an OOB modem, the DSG method and an OOB method in the receiver as shown in FIG. According to each scheme, a demodulator for transmitting data to the headend side is further required.

As described above, when both the IP method, the existing DSG method, and the OOB method can be used, or when the IP method and the OOB method can be used except for the DSG method, the transmission side determines whether to use the cable card ( 520). The cable card 520 informs the host 500 of the operation method according to the information determined by the transmitter. In this case, the backward compatibility problem can also be solved .

For the convenience of description, the receiver of FIG. 5 receives service information and OOB messages through the network interface unit 514 using IP, rather than the DSG method using the DOCSIS modem or the OOB method using an OOB tuner. Explain mainly. In this case, the transmitting side must packetize the service information and the OOB message using IP and transmit the packet. In the case of a VOD or an IPTV broadcast, a message such as CA system information may be received in a packet form such as the VOD packet or an IPTV broadcast packet.

The above-described OOB message is just one example, and other necessary information other than the above-described information may be added or unnecessary information may be excluded from the above-described information, depending on the implementation.

The network unit 516 routes the received packet to a destination of the packet by using a network stack based on the TCP / IP protocol or the User Datagram Protocol (UDP) / IP protocol. That is, the network unit 516 may support both the TCP / IP protocol and the UDP / IP protocol.

The network unit 516 routes the received VOD signal or the IPTV broadcast signal to the parser 518. The parsing unit 518 receives a moving picture expert group (MPEG) based TP packet included in an IP / UDP packet, parses the received moving picture expert group (MPEG) based TP packet, and parses the received TP packet. 508). The process after the multiplexer 508 is as described above. In the above example, since a broadcast signal based on MPEG is assumed, a TP packet is received and parsed. However, when a broadcast signal using a different standard is received, a unit other than the TP packet unit may be used. Therefore, the spirit of the present invention is not limited to the terms according to the embodiments.

The network unit 516 transmits the packet whose destination is the cable card 520 to the cable card 520. The OOB (Out Of Band) message, which is one of the packets whose destination is the cable card 520, is routed in the network unit 516 and transmitted to the cable card 520. When routing the OOB message to the cable card 520, data may be transmitted to the cable card 520 through a second layer routing or a third layer routing.

The network unit 516 transmits the packet whose destination is the control unit 522 to the control unit 522. The service information, which may be one of the packets whose destination is the control unit 520, is routed in the network unit 516 and transmitted to the control unit 522. When the service information is routed to the controller 522, data may be transmitted to the controller 522 through a second layer routing, a third layer, and a fourth layer routing. Here, the fourth layer routing uses port information included in the TCP packet.

In case of using the second layer routing, routing is performed using a media access control (MAC) address system of a destination included in a header of a received Ethernet frame. In case of using the third layer routing, routing is performed using the destination IP address system included in the IP header of the received Ethernet frame. Whether to use the second layer routing or the third layer routing may vary depending on implementation. That is, according to the implementation example, the second layer routing scheme may be used, or the third layer routing scheme may be used.

A data channel and an extended channel exist between the cable card 520 and the host 500. The data channel is set to exchange control signals between the host 500 and the cable card 520, and the extension channel is a channel set to exchange actual data. The expansion channel is a CPU interface defined to exchange data between the host 500 and the cable card 520.

That is, the cable card 520 communicates with the sender, interprets the command received from the sender, and then communicates with the host through the data channel and the extended channel to perform the instructions indicated by the sender, or the user It plays the role of delivering the entered contents to the sender.

In this case, in order to transmit data through the extension channel, first, a transmission line corresponding to the data type defined between the cable card 520 and the host 500 should be set. This is called flow. For example, in order to transmit MPEG section data, the MPEG section flow may be set between the cable card 520 and the host 500 and then the actual MPEG section data may be transmitted on the flow.

The flow on the extension channel includes an IP unicast (IP_U) flow, an IP multicast (IP_M) flow, and up to six MPEG section flows. If the DOCSIS modem is embedded in the host as shown in FIG. 5, the flow on the extension channel further includes a DSG flow for transmitting an OOB message received through the DOCSIS modem to a cable card. do.

The OOB message packet received through the network interface unit 514 may be transmitted to the cable card through IP address based routing. Routing to the destination IP address is performed via network portion 516. In addition, the packet used in each application of the host 500 is routed to each corresponding application. For example, an application in the host 500 may include a multicasting (MC) application and a navigation (NAV) application.

An IP_U flow or an IP_M flow may be used when transmitting data from the host 500 to the cable card 520, and an IP_U flow may be used when transmitting data from the cable card 520 to the host 500. Data received by the cable card 520 through the flow is rerouted and transmitted to the corresponding application in the cable card. For example, applications in the cable card may include a CA (Conditional Access) application, an MC application, and an Implement Pay Per View (IPPV) Report back function (RPP) application.

Among the data received by the cable card 520, MPEG section data other than the data used only in the cable card 520 are filtered and routed to each application of the host 500 through the MPEG section floor. For example, the MPEG section data includes SI, EAS, and XAIT data. The cable card 520 extracts MPEG section data from the received data, configures the MPEG section data fragment into complete MPEG section data, and transmits the MPEG section data to the host 500 through the MPEG section floor.

Among the flows, the IP_U flow transmits data received to the host 500 in a unicast manner to the cable card 520 and has bidirectionality between the host 500 and the cable card 520. The IP_M flow transmits data received in a multicast manner to the host 500 to the cable card 520. The IP_M flow has a one-way direction in the cable card direction.

When the OOB message is received through data transmission and reception between the cable card 520 and the transmitting headend, a unicast scheme may be used. When the OOB message is transmitted and received using the unicast method as described above, the OOB message received by the host 500 may be transmitted to the cable card 520 through the IP_U flow.

The network unit 516 receives the Ethernet frame packet and routes it to the destination address of the packet. In this case, when the above-described OOB message is received and routed to the cable card 520 according to the unicast method, the OOB message may be routed to the cable card 520 through the IP_U flow.

As described above, the host 500 may route the OOB message to the cable card 520 using the second layer routing or the third layer routing. The cable card 520 is preset with a specific MAC address and IP address. In the case of the second layer routing, data in which the destination MAC address included in the Ethernet header of the Ethernet frame is set to the MAC address of the cable card is transmitted to the cable card 520. In the case of the third layer routing, data to which the destination IP address included in the IP header of the Ethernet frame is set to the IP address of the cable card is transmitted to the cable card 520.

However, in case of the IP_U flow, an IP packet is transmitted. The IP packet includes a 20-byte IP header portion, an 8-byte UDP header portion, and a UDP payload portion. Similarly, when data is transmitted according to a TCP protocol other than the UDP protocol, a TCP header portion and a TCP payload portion are included instead of the UDP header portion or the UDP payload portion.

Therefore, in case of using the second layer routing method or the third layer routing method, the data of the IP packet form in which the Ethernet header part and the Ethernet CRC part are removed from the Ethernet frame packet are transferred to the cable card 520. send. The IP packet may be divided into a broadcast data packet including an MPEG section, a CA data packet including information regarding limited reception, and the like according to the type of data included.

6 is a diagram illustrating an embodiment method for adjusting the aspect ratio of an image frame according to the present invention.

Referring to FIG. 6, the decoder 512 adjusts an aspect ratio of an image frame based on AFD data included in a video signal of a broadcast program. If there is no AFD data in the video signal of the broadcast program, the decoder 512 may adjust the aspect ratio of the image frame based on the previously stored AFD data. Here, the AFD data may be stored for each virtual channel, and the AFD data previously stored in the same virtual channel may be used to adjust the aspect ratio of the image frame.

The decoder 512 checks whether AFD data exists in the video signal of the broadcast program 610. Since the AFD data 611 exists in the video signal of the broadcast program 610, the decoder 512 adjusts the aspect ratio of the image frame of the broadcast program 610 based on the AFD data 611.

The decoder 512 determines whether AFD data exists in the video signal of the broadcast program 620. Since there is no AFD data in the video signal of the broadcast program 620, the decoder 512 adjusts the aspect ratio of the image frame of the broadcast program 620 based on the previously stored AFD data 611.

In addition, the decoder 512 checks whether AFD data exists in the video signal of the broadcast program 630. Since the AFD data 631 of the broadcast program 630 exists, the decoder 512 adjusts the aspect ratio of the image frame of the broadcast program 630 based on the AFD data 631.

7 illustrates a method of another embodiment for adjusting the aspect ratio of an image frame according to the present invention.

Referring to FIG. 7, the decoder 512 determines whether AFD data exists in a video signal of the broadcast program 710. Since the AFD data 711 exists in the video signal of the broadcast program 710, the decoder 512 adjusts the aspect ratio of the image frame of the broadcast program 710 based on the AFD data 711.

The decoder 512 determines whether AFD data exists in the video signal of the broadcast program 720. Since there is no AFD data in the video signal of the broadcast program 720, the decoder 512 adjusts the aspect ratio of the video frame of the broadcast program 720 based on the replacement AFD data set according to the AFD setting command. Here, the interface unit 536 may receive an AFD setting command from the user, and the control unit 522 may set replacement AFD data based on the received AFD setting command.

In addition, the decoder 512 checks whether AFD data exists in the video signal of the broadcast program 730. Since the AFD data 731 of the broadcast program 730 exists, the decoder 512 adjusts the aspect ratio of the video frame of the broadcast program 730 based on the AFD data 731.

8 is a table showing definition values of AFD data.

Referring to FIG. 8, the decoder 512 detects an aspect ratio of an image frame from the table 800 based on the AFD data and the aspect ratio. AFD data has a value located in the active_format column. In addition, according to the table 800, the AFD data values may indicate different aspect ratios according to the aspect ratio values. For example, when the AFD data is '1000', when the aspect ratio is 4: 3, the AFD data indicates an aspect ratio of 4: 3, and when the aspect ratio is 16: 9, the AFD data may display an aspect ratio of 16: 9. Instruct.

FIG. 9 is a diagram illustrating an aspect ratio of an adjusted image frame according to the value of AFD data when the aspect ratio value is 16: 9.

Referring to FIG. 9, when the AFD data is '0100' when the aspect ratio is 16: 9, the decoder 512 displays an image frame at an aspect ratio 910 larger than 16: 9. In addition, if the AFD data is '1000', the decoder 512 displays the image frame as a full frame 920. In addition, if the AFD data is '1001', the decoder 512 displays an image frame in a 4: 3 aspect ratio 930. In addition, if the AFD data is '1010', the decoder 512 displays an image frame in a 16: 9 aspect ratio 940. In addition, if the AFD data is '1011', the decoder 512 displays an image frame with a 14: 9 aspect ratio 950. In addition, if the AFD data is '1101', the decoder 512 displays an image frame in a 4: 3 aspect ratio 960. In addition, if the AFD data is '1110', the decoder 512 displays an image frame in a 16: 9 aspect ratio 970. In addition, if the AFD data is '1111', the decoder 512 displays an image frame at a 16: 9 aspect ratio 980.

FIG. 10 is a diagram illustrating an aspect ratio of an adjusted image frame according to a value of AFD data when an aspect ratio value is 4: 3.

Referring to FIG. 10, when the value of the aspect ratio is 4: 3 and the AFD data is '0010', the decoder 512 displays an image frame at a 16: 9 aspect ratio 1010. In addition, if the AFD data is '0011', the decoder 512 displays an image frame at a 14: 9 aspect ratio 1020. Also, if the AFD data is '0100', the decoder 512 displays the image frame at an aspect ratio 1030 larger than 16: 9. If the AFD data is '1000', the decoder 512 displays the image frame as a full frame 1040. In addition, if the AFD data is '1010', the decoder 512 displays an image frame in a 16: 9 aspect ratio 1050. In addition, if the AFD data is '1011', the decoder 512 displays an image frame at a 14: 9 aspect ratio 1060. In addition, if the AFD data is '1101', the decoder 512 displays an image frame in a 4: 3 aspect ratio 1070. In addition, if the AFD data is '1110', the decoder 512 displays an image frame in a 16: 9 aspect ratio 1080. In addition, if the AFD data is '1111', the decoder 512 displays an image frame at a 16: 9 aspect ratio 1090.

11 is a flowchart illustrating a process of performing a preferred embodiment of the image display method according to the present invention.

Referring to FIG. 11, the receiver receives a broadcast signal (S1100). Here, the broadcast signal may be received through at least one of a cable and an antenna, and the broadcast signal may also be transmitted through an IP (Internet Protocol) packet. Also, the receiver may include tuner units 501 and 502 and a demodulator 506, and may include a network interface unit 514.

The demultiplexer 510 demultiplexes the received broadcast signal into an audio signal, a video signal, and a data signal (S1110).

The decoder 512 decodes the video signal (S1120). The decoder 512 may further decode the audio signal and the data signal.

The decoder 512 checks whether AFD (Active Format Description) data exists in the decoded video signal (S1130).

If there is no AFD data, the decoder 512 adjusts an aspect ratio of an image frame included in the decoded video signal based on the preset AFD data (S1140). The preset AFD data may be previously stored AFD data. Also, the control unit 522 may be AFD data set based on the AFD setting command received. The AFD setting command may indicate any one of values defined in the active_format column shown in FIG. 8, and the controller 522 may set the AFD data to a value indicated by the AFD setting command. In addition, the preset AFD may be set for each virtual channel.

If there is AFD data, the decoder 512 adjusts the aspect ratio of the image frame based on the existing AFD data (S1150). The decoder 512 may output the existing AFD data to be stored in the storage 532.

The display unit 634 displays an image frame of which the aspect ratio is adjusted (S1160).

Claims (16)

Receiving unit for receiving a broadcast signal;
A demultiplexer which demultiplexes the received broadcast signal into an audio signal, a video signal, and a data signal;
Decode the video signal, determine whether there is Active Format Description (AFD) data in the decoded video signal, and if the AFD data does not exist, the decoded video based on preset AFD data. A decoder for adjusting an aspect ratio of an image frame included in a signal; And
And a display unit for displaying the adjusted video frame. The method of claim 1,
And wherein the preset AFD data is previously stored AFD data. The method of claim 1,
An interface unit for receiving an AFD setting command; And
And a controller configured to set the preset AFD data based on the received AFD setting command. The method of claim 1,
And the preset AFD data is set for each virtual channel. The method of claim 1,
An audio decoder for decoding the audio signal; And
And a data decoder for decoding the data signal. The method of claim 1,
The receiver may further comprise:
A tuner unit for tuning a broadcast signal including the broadcast signal received through at least one of a cable and an antenna; And
And a demodulator for demodulating the received broadcast signal. The method of claim 1,
The receiver may further comprise:
And a network interface unit for receiving an IP (Internet Protocol) packet including the broadcast signal. The method of claim 1,
And the video decoder adjusts an aspect ratio of the video frame based on the AFD data when the AFD data exists. Receiving a broadcast signal;
Demultiplexing the received broadcast signal into an audio signal, a video signal and a data signal;
Decoding the video signal;
Confirming whether AFD (Active Format Description) data exists in the decoded video signal;
If the AFD data does not exist, adjusting an aspect ratio of an image frame included in the decoded video signal based on a preset AFD data; And
And displaying the adjusted image frame. The method of claim 9,
And the preset AFD data is previously stored AFD data. The method of claim 9,
Receiving an AFD setting command;
And setting the preset AFD data based on the received AFD setting command. The method of claim 9,
The preset AFD data is set for each virtual channel (Virtual Channel). The method of claim 9,
Decoding the audio signal; And
And decoding the data signal. The method of claim 9,
And the broadcast signal is received through at least one of a cable and an antenna. The method of claim 9,
The broadcast signal is a video display method characterized in that the transmission through the IP (Internet Protocol) packet. The method of claim 9,
And adjusting the aspect ratio of the image frame based on the AFD data when the AFD data exists.

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