KR20110068821A - Method and apparatus for receiving and transmitting - Google Patents

Abstract

PURPOSE: A transmitting/receiving apparatus and method thereof are provided to couple a broadcasting channel for basic service with a broadcasting channel for additional service and to effectively offer the broadcasting service of high quality. CONSTITUTION: One or more source encoding units(110,110') encodes basic sources to transport streams for basic service. One or more re-multiplexers(130,130') re-multiplexes transport streams for basic service to single transport stream. An integrated re-multiplexer(170) re-multiplexes the transport stream for additional service to the single transport stream. One or more basic service transmission unit modulates the single transport stream for basic service.

Description

Songs, receiving devices and methods of sending and receiving {METHOD AND APPARATUS FOR RECEIVING AND TRANSMITTING}

The following embodiments relate to a song, a receiving device and a song, a receiving method.

The 3DTV broadcasting technology transmits a reference video (left video) and various types of 3D additional video (right video, depth video, etc.) through a digital broadcasting network, and the 3DTV terminal receives it, converts it into left and right video, and then sends it to the 3D display. By playing it, you can feel the three-dimensional effect. As a general method for this, a method of shortening left and right images in one image frame and multiplexing them and then broadcasting them using a conventional digital broadcasting network (side-by-side) has been widely used.

However, this method has a problem in that left and right images are simultaneously viewed in a general two-dimensional terminal. Therefore, in order to guarantee full backward compatibility, the left and right video signals are virtually transmitted through two channels, and PID (Packet Identifier) for distinguishing the left and right video signals from the program data indicating stereoscopic video is added. The method of transmission was used.

In the method of transmitting by adding a PID (Packet Identifier), the left and right images are encoded and multiplexed into one transport stream (TS), and then broadcast through one RF channel. Therefore, when there is a restriction on the size of the effective data rate for the RF channel, the quality of a general two-dimensional broadcast is caused. In particular, in the ATSC type digital broadcasting, the effective effective data rate is about 19.36 Mbps, and when the left and right video are transmitted through one RF channel, the overall two-dimensional broadcast service quality is degraded.

As described above, if there is a limitation to expand the broadcasting channel capacity for high quality broadcasting service in 3DTV broadcasting, there is an urgent need for a method to solve this problem.

According to an embodiment of the present invention, in order to provide a high quality broadcast service such as 3DTV, multiple additional services share one broadcast channel, and other broadcast channels providing basic services simultaneously provide efficient high quality service. Provided are a song, a receiving device, and a song, a receiving method.

In addition, an embodiment of the present invention is efficient in the broadcast channel for the base service and the broadcast channel for the additional service in a broadcast environment in which the transmission bit rate for the additional service is smaller than the bit rate for the basic service, such as 3DTV broadcast service Provides a song, a receiving device and a song, a receiving method that can be interworked with.

The transmission apparatus according to an embodiment of the present invention includes at least one source encoder unit for encoding elementary sources into transport streams for a basic service, and encoding an additional source coupled to the elementary sources into a transport stream for an additional service. ; At least one remultiplexer for remultiplexing transport streams for the base service into a single transport stream for the base service; An integrated remultiplexer for remultiplexing the transport stream for the supplementary service into a single transport stream for the supplementary service; At least one basic service transmitter for modulating and channel encoding a single transport stream for the basic service and outputting the broadcast channel for the basic service; And the additional service transmitter which modulates and channel-codes a single transport stream for the additional service and outputs the broadcast channel for the additional service.

According to an embodiment of the present invention, a receiving apparatus includes: a basic service receiving unit configured to demodulate and channel decode a signal received through any one of broadcasting channels for a basic service and extract a transport stream provided for the basic service; An additional service receiver for demodulating and channel decoding a signal received through a broadcast channel for an additional service coupled to the basic service to extract a transport stream provided for the additional service; For each transport stream provided for the base service and the transport stream provided for the supplementary service for extracting at least one transport stream of a transport stream for the base service, a transport stream for the supplementary service, and a transport stream for the service information. An integrated demultiplexer for performing demultiplexing; And a source decoder section for decoding each of the transport stream provided for the demultiplexed supplementary service and the transport stream provided for the demultiplexed supplementary service to output an elementary source or an additional source coupled to the elementary source.

A transmission method according to an embodiment of the present invention includes encoding elementary sources into transport streams for a basic service, and encoding an additional source coupled to the elementary sources into a transport stream for an additional service; Remultiplexing the transport streams for the base service into a single transport stream for the base service, and remultiplexing the transport stream for the supplementary service into a single transport stream for the supplementary service; Modulating and channel coding a single transport stream for the basic service and outputting the broadcast channel for the basic service, and modulating and channel coding the single transport stream for the additional service and outputting the broadcast channel for the additional service. It includes.

A reception method according to an embodiment of the present invention includes the steps of demodulating and channel decoding a signal received through one of the broadcast channels for the broadcast service for the basic service to extract a transport stream provided for the basic service; Demodulating and channel decoding a signal received through a broadcast channel for an additional service coupled to the basic service to extract a transport stream provided for the additional service; For each transport stream provided for the base service and the transport stream provided for the supplementary service for extracting at least one transport stream of a transport stream for the base service, a transport stream for the supplementary service, and a transport stream for the service information. Performing demultiplexing; And decoding each of the transport stream provided for the demultiplexed supplementary service and the transport stream provided for the demultiplexed supplementary service to output an elementary source or an additional source coupled to the elementary source.

According to an embodiment of the present invention, in a broadcast environment in which a transmission bit rate for an additional service is smaller than a bit rate for a basic service, such as a 3DTV broadcasting service, a broadcast channel for the basic service and a broadcast channel for the additional service are linked to each other. It can effectively provide a broadcast service.

In addition, according to an embodiment of the present invention, if it is difficult to secure additional transmission capacity in the existing broadcast channel for 3DTV broadcasting by securing a separate wired and wireless broadcast channel so that multiple operators can share at the same time Therefore, it is possible to provide effective high quality 3DTV broadcasting service without deterioration of existing broadcasting.

1 is a block diagram of a transmitting apparatus according to an embodiment of the present invention.
2 is a diagram illustrating a PSIP configuration according to an embodiment of the present invention.
3 is a block diagram of a receiving apparatus according to an embodiment of the present invention.
4 is a block diagram of an integrated demultiplexer according to an embodiment of the present invention.
5 is a flowchart illustrating a transmission method according to an embodiment of the present invention.
6 is a flowchart illustrating a receiving method according to an embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited or limited by the embodiments. Also, like reference numerals in the drawings denote like elements.

In one embodiment of the present invention, a broadcast channel refers to a physical transport channel provided for each broadcaster (or network operator), and a virtual channel is divided again and again within a broadcast channel to provide individual services. Means channel.

1 is a block diagram of a transmitting apparatus according to an embodiment of the present invention. Referring to FIG. 1, a transmission apparatus according to an embodiment of the present invention may include at least one source encoder unit 110, at least one remultiplexer 130, at least one basic service transmitter 150, and an integrated remultiplexer ( 170 and the additional service transmitter 190.

The source encoder unit 110 encodes the elementary sources into transport streams for the basic service, and encodes an additional source coupled to the elementary sources into a transport stream for the additional service.

The source encoder unit 110 includes a basic source encoder 112 for encoding basic sources into transport streams for the basic service and an additional source encoder 114 for encoding additional sources coupled to the basic sources into a transport stream for the additional service. ).

In FIG. 1, basic sources (basic source A1, basic source A2, etc.) are programs, that is, content sources, provided for each broadcaster to provide a basic service corresponding to a general broadcast service.

The basic source encoder 112 encodes the content sources with a standardized codec, and if the content source is about an AV service, it can encode the video and audio, respectively. Can be.

In addition, the additional source encoder 114 may operate independently of the basic source encoder 112, or may operate dependently to use interrelationships such as multi-view coding (MVC) and scalable video coding (SVC). have.

When the basic source encoder 112 and the additional source encoder 114 operate independently in a digital broadcast such as ATSC, the basic source encoder 112 uses the MPEG-2 encoder to ensure backward compatibility, and the additional source As the encoder 114, an MPEG-4 AVC encoder having good compression efficiency may be used.

As described above, when the MPEG-2 encoder is used as the primary source encoder 112 and the MPEG-4 AVC encoder is used as the additional source encoder 114, the bit rate of the transport stream encoding the additional source is higher than that of the basic service. Much smaller.

As a result, the transmitting apparatus multiplexes two additional services (additional source A1 and additional source B1) having a small bit rate and transmits them to a broadcast channel (broadcast channel D) for the additional service, and a basic service having a large bit rate (basic source A1, A2, B1, and B2 may transmit a broadcast channel (here, broadcast channels A and B) for a basic service.

Therefore, the receiving device or the receiving terminal corresponding to the transmitting device simultaneously receives any one of the broadcast channels A, B, ... for the basic service and the broadcast channel D for the additional service, thereby providing a high quality broadcast service to the user. Can be provided.

According to an embodiment of the present invention, an additional source (additional source A1, additional source B1, ..) for providing a high quality service through a separate broadcast channel D for additional service may be provided. The broadcast channel D for the additional service may be the same broadcast network as the broadcast channels A, B, ... for the basic service, or may be a heterogeneous network such as an IPTV.

The primary source encoder 112 and the additional source encoder 114 may be operated by a single system time clock (STC) to provide high quality service to the user. The base source encoder 112 and the supplementary source encoder 114 use the same system time clock to synchronize clock reference information (eg, PCR, etc.) and time for the transport streams for the base service and the transport stream for the supplementary service, respectively. Stamps (DTS, PTS, etc.) can be inserted.

In addition, the basic source encoder 112 and the additional source encoder 114 allows time stamps to be synchronized with each other so that the basic service and the additional service can be reproduced at the same time on the receiving side. That is, in the case of 3DTV, for example, the same time stamp may be inserted into each access unit (AU) of the transport streams for the basic service and the transport stream for the additional service so that the left and right images can be reproduced at the same time. .

Descriptors for notifying virtual channels interworking with different broadcast channels may be inserted into a transport stream for a basic service or a transport stream for an additional service. Descriptors for notifying virtual channels that interoperate with each other will be described later with reference to FIG. 2.

The remultiplexer 130 is used to remultiplex transport streams for a basic service encoded with basic sources into a single transport stream (for example, an MPEG-2 transport stream (TS)) for a basic service. Multiple programs can be provided for each.

The remultiplexer 130 may packetize and multiplex information about a channel and information about a service into a transport stream having a specific packet ID (PID).

The basic service transmitter 150 modulates and channel-codes a single transport stream for the basic service and outputs the broadcast channel for the basic service.

Each of the basic service transmitters 150 modulates and channel-codes a single transport stream for the multiplexed basic service for each broadcaster to broadcast channels for the basic service allocated to each broadcaster (here, A, B,... Broadcast via).

The integrated remultiplexer 170 receives a transport stream for the additional service encoded from the additional source encoder 114 of each service provider and remultiplexes it into a single transport stream for the additional service. The integrated remultiplexer 170 is a structure in which a transport stream for an additional service is multiplexed and transmitted to one physical broadcast channel, in which multiple broadcasters share one broadcast channel to transmit their respective additional service.

The transport stream for the remultiplexed supplementary service is channel-coded and modulated by the supplementary service transmitter 190 and then broadcasted on a separate broadcast channel D for the supplementary service.

As a result, the additional source A1, the additional source B1, etc., which are linked to the basic source A1, the basic source B1, ..., etc. of the respective operators are coded by the additional source encoder 114, and then the broadcast channel for the basic service allocated to each operator. Rather than being broadcasted on (A, B), it is remultiplexed into one single transport stream for additional services and broadcasted on a separate broadcast channel (D) for additional services.

When each operator's remultiplexer 130 and the integrated remultiplexer 170 are based on the MPEG-2 system, jitter of PCR may be corrected in the process of remultiplexing each transport stream.

However, since a single transport stream for the base service remultiplexed by the remultiplexer 130 and the integrated remultiplexer 170 and a single transport stream for the supplementary service are generated by the same system time clock (between the base transports) Synchronization of PCR between a single stream for a service and a transport stream for a corresponding supplementary service can be maintained continuously.

Detailed information about channels and services in digital broadcasting may be transmitted through PSI (Program Specific Information), or may be transmitted through Program Service Information Protocol (PSIP) or Service Information (SI). Detailed information about the channel and the service may be packetized into a transport stream having a specific packet ID (PID) and finally multiplexed in the remultiplexer 130 and the integrated remultiplexer 170.

The additional service transmitter 190 modulates and channel-codes a single transport stream for the additional service and outputs the broadcast channel for the additional service.

In one embodiment of the present invention, the term 'service' is used as the term 'program' in some standard documents, and the service may be provided through several virtual channels in one transport stream.

2 is a diagram showing the configuration of a PSIP according to an embodiment of the present invention. Referring to FIG. 2, in the case of PSIP (see ATSC standard document A / 65C), attributes of virtual channels in a transport stream are described in a virtual channel table (VCT).

In an embodiment of the present invention, to inform a virtual channel interworking between different broadcast channels, a descriptor as shown in [Table 1] may be defined in a descriptor loop in the VCT of the PSIP.

        Sphere door 3D_service_descriptor () {
descriptor_tag
descriptor_length
:
dependency_flag
If (dependency_flag) {
Channel_TSID
Elementary_PID
:
}

If the high quality service to be provided to the user is a 3DTV service, the name of the descriptor may mean a 3DTV service, and the presence or absence of the descriptor itself or a separate flag in the descriptor may be used. Through the 3DTV service can be informed to the receiving side.

Channel_TSIDs 220, 240, and 251 are indicators for notifying a transport stream transmitted through another broadcast channel to which they are linked, and may be transport_stream_id in a program association table (PAT) of a transport stream or channel_TSID in a descriptor loop of a virtual channel of a VCT. .

Chanel_TSID (220, 240, 251) in the digital broadcast is assigned a unique value for each physical broadcast channel can indicate different physical channels using the Channel_TSID.

Elementary_PID (Packet IDentifier) 253 is a packet ID (PID) of a video transport stream in an associated virtual channel. Elementary_PID 253 may be defined through Service_location_descriptor of VCT.

Also, Program_Number (210, 230) for identifying a program provided through a virtual channel may be defined in the PAT and the VCT.

In an embodiment of the present invention, the basic service and the additional service may allocate Program_Number having the same value to each other to recognize it as a single program, and may assign different Program_Numbers to recognize each as an extended program.

When different Program_Number is allocated between the basic service and the additional service, Program_Number together with Channel_TSID can be written in the if statement of [Table 1] to indicate programs of different broadcast channels. If Program_Number is the same between two services, even if Program_Number is not separately written, the program provided through the virtual channel of another broadcast channel may be naturally indicated by only the Channel_TSID.

Another way to use Program_number in the if statement in Table 1 is to enter source_id in the VCT.

Here, since source_id is for identifying a programming source in the virtual channel, a source between the base service and the supplementary service may be linked using the source_id.

Meanwhile, a descriptor of Table 1 may be inserted into a transport stream for a basic service or a transport stream for an additional service, and in order to minimize an error of an already released receiver, the descriptor of Table 1 may be used. Can be inserted into the transport stream for additional services.

In the descriptor of Table 1, various attributes for 3D broadcast services, such as 3D video format and left / right notification, may be described in addition to the indicator for channel interworking. In addition, the descriptor of Table 1 is transmitted through a descriptor loop in an event information table (EIT) that describes event information such as program titles and program start times of virtual channels. In addition, it may be transmitted through a descriptor loop in a program map table (PMT).

Since the event information table (EIT) describes event information in units of time, it may be used for switching between two-dimensional and three-dimensional broadcast programs in units of time.

As described in Table 1, in an embodiment of the present invention, in order to interwork basic services and additional services provided through different physical broadcast channels, channel_TSIDs of different broadcast channels to be interworked with each other and 3D_service_descriptor elementary_PIDs of video TSs are linked. Can be inserted.

2 shows Program_Number 210 of transport streams TS (A), TS (B), TS (C) for the basic service and Program_Number 230 of transport streams TS (D) for the additional service. The same Program_Number (here, 0x00A1, 0x00B1, 0x00C1) is used, and 3D_service_descriptor 250 is inserted into a transport stream TS (D) for additional service.

The 3D_service_descriptor 250 is a Channel_TSID 251 (0x0AA1, 0x0BB1, 0x0CC1) in a transport stream (TS (A), TS (B), TS (C)) for the basic service to be interworked with the reference video transport stream in each transport stream. The packet may have an Elementary_PID value 253 (0x1F1, 0x1F2, 0x1F3) of the packet.

In the above description, a case in which two virtual channels are interworked has been described, but as a more general case, when two or more channels are interworked, a descriptor for signaling the same may be defined as shown in Table 2 below.

      Sphere door channel_bonding_descriptor ()
{
descriptor_tag
descriptor_length
:
service_type
num_bonding_channel
for (i = 0; i <num_bonding_channel; i ++)
channel_locator (i)
:
}

In Table 2, descriptor_tag is a value for identifying a descriptor for describing channel interworking information. service_type represents a type of service provided through broadcast channel interworking according to an embodiment of the present invention.

For example, 0x02 = TV service, 0x03 = audio service, 0x10 = 3DTV service, 0x11 = multi-view TV service, and 0x20 = UHDTV (Ultra High definition TV) service.

That is, the 3DTV service may be realistically possible through two channel interworking, but when interworking with multiple channels, a service such as a multi-view TV or a UHTV may be designated.

num_bonding_channel represents the number of broadcast channels for additional services to be linked to the broadcast channel for basic services.

channel_locator () is used to indicate the position of a virtual channel in a broadcast channel to be linked. Channel_TSID, Elementary_PID, Program_Number, source_id, and association_tag (separate identifiers for identifying an elementary stream in a program; (e.g.) ATSC DATA BROADCAST STANDARD (see A90)).

When two channels are linked as shown in FIG. 1, num_bonding_channel is 1, channel_locator (0) may indicate a broadcast channel for basic service, and channel_locator (1) may indicate a broadcast channel for additional service.

Meanwhile, the num_bonding_channel value may be increased for services such as multi-view TV and UHTV.

3 is a block diagram of a receiving apparatus according to an embodiment of the present invention. Referring to FIG. 3, a reception apparatus according to an embodiment of the present invention includes a basic service receiver 310, an additional service receiver 320, an integrated demultiplexer 330, and a source decoder 370. In addition, the reception device 300 according to an embodiment of the present invention may further include a service information analyzer 350.

The basic service receiving unit 310 is for receiving a basic service, and demodulates and decodes a signal received through any one of the broadcasting channels (broadcast channel A, broadcast channel B, ..) for the basic service. Extract the transport stream provided for the basic service.

The supplementary service receiver 320 is provided to provide the supplementary service by demodulating and channel decoding a signal (here, the signal of the broadcast channel D) received through a broadcast channel for the supplementary service coupled to the basic service. Extract the transport stream.

The integrated demultiplexer 330 receives a transport stream for the basic service, a transport stream for the additional service, and service information through each demultiplexer (the basic service demultiplexer 332 and the additional service demultiplexer 334). Extracts a transport stream for each other and performs synchronization processing of two transport streams (a transport stream for a basic service and a transport stream for an additional service) transmitted through different broadcast channels.

The integrated demultiplexer 330 is provided for the transport stream provided for the basic service and the supplementary service to extract at least one transport stream of the transport stream for the basic service, the transport stream for the supplementary service, and the transport stream for the service information. Demultiplexing is performed on each transport stream.

The integrated demultiplexer 330 may perform synchronization between the transport stream provided for the basic service and the transport stream provided for the additional service.

In addition, the integrated demultiplexer 330 performs the demultiplexing on the transport stream provided for the additional service and the basic service demultiplexer 332 for performing demultiplexing on the transport stream provided for the basic service. It may include a portion 334. The integrated demultiplexer 330 will be described in detail with reference to FIG. 4.

The service information analysis unit 350 analyzes a transport stream for service information (PSIP, SI, PSI, etc.) extracted from the integrated demultiplexer 330 to provide a high quality service through a broadcast channel, virtual channel, or service type. It can interpret the information including.

The information interpreted by the service information analyzer 350 may be displayed to the user through an electronic program guide (EPG). Therefore, the user can select the basic service or the high quality service by the electronic program guide.

Each transport stream extracted through the integrated demultiplexer 330 is decoded by the source decoder 370.

The source decoder 370 decodes each of the transport stream provided for the demultiplexed base service and the transport stream provided for the demultiplexed side service to output a base source or an additional source coupled to the base source.

The source decoder unit 370 may independently decode (eg, MPEG-2, MPEG-4 AVC) or the basic source decoder 372 and the additional source decoder 374 between the basic source decoder 372 and the additional source decoder 374. Interdependence decoding (eg, MVC, SVC) may be performed.

The source decoder 370 may provide a high quality service by combining a basic quality service or a combination of a basic source and an additional source by decoding.

For example, in the case of a 3DTV broadcasting service, a basic quality service may be two-dimensional broadcasting, and a high quality service may be three-dimensional broadcasting.

On the other hand, in the embodiment of the present invention, if the basic quality of service is to be provided, only the basic service receiving unit 310 and related components may operate.

4 is a block diagram of an integrated demultiplexer according to an embodiment of the present invention. 4, the integrated demultiplexer 400 according to an embodiment of the present invention includes a basic service demultiplexer 410, an additional service demultiplexer 430, and a controller 450.

The basic service demultiplexer 410 demultiplexes the transport stream provided for the basic service, and may include a first packet filter 411, a first buffer 413, and a first packet decoder 415. have.

The first packet filter 411 may extract a transport stream for the basic service or a transport stream for the service information from the transport stream provided for the basic service.

The first packet filter 411 may extract a transport stream for the basic service from the transport stream provided for the basic service extracted through the basic service receiver 310. In the MPEG-2 system, the first packet filter 411 uses a packet ID (PID) of a transport stream (TS) packet having a unique value for each component of a program to determine a transport stream (TS) for a basic service. Can be extracted.

In addition, the first packet filter 411 extracts a packet of a specific transport stream that transmits PCR and sends the packet to a system time clock generator 451, and extracts a PSIP or SI and PSI transmission TS packet to provide a service. It can be sent to the information analysis unit 350.

The first buffer 413 may temporarily store a transport stream for the basic service so that playback of the transport stream for the basic service and the transport stream for the additional service are performed at the same time. That is, when the transport stream for the basic service is transmitted faster than the transport stream for the additional service, the first buffer 413 waits for the transport stream for the additional service until the transport stream for the additional service is transmitted. Do it.

The first packet decoder 415 may decode the transport stream for the basic service output from the first buffer 413.

The additional service demultiplexer 430 demultiplexes the transport stream provided for the additional service, and may include a second packet filter 431, a second buffer 433, and a second packet decoder 435. have.

The second packet filter 431 may extract a transport stream for the additional service from the transport stream provided for the additional service.

The second packet filter 431 may extract a transport stream for the supplementary service from the transport stream provided for the supplementary service extracted through the supplementary service receiver. In the MPEG-2 system, the second packet filter 431 extracts a transport stream (TS) for an additional service by using a packet ID (PID) of a transport stream (TS) packet having a unique value for each program element. can do.

The second buffer 433 may temporarily store a transport stream for an additional service. Like the first buffer 413, the second buffer 433 also transmits the transport stream for the supplementary service when the transport stream for the supplementary service is transmitted faster than the transport stream for the supplementary service. It serves to wait until

The second packet decoder 435 may decode the transport stream for the additional service output from the second buffer 433.

The controller 450 controls the buffer so that the outputs of the basic service demultiplexer 410 and the additional service demultiplexer 430 are made at the same time point, and corrects the system time clock accordingly.

The controller 450 may control whether the basic service demultiplexer 410 and the additional service demultiplexer 430 operate according to the control mode of the service.

The controller 450 may include a system time clock generator 451, a buffer controller 453, and a system time clock corrector 455.

The system time clock generator 451 may generate a system time clock using the PCR transport stream of the basic service extracted through the first packet filter 411.

The system time clock generator 451 may generate a system time clock locked with the encoder of the transmitter by using the PCR transport stream which is the reference information of the clock (MPEG-2 system standard (ITU-T Rec. H.222).

In one embodiment of the invention, the transport stream for the base service (base service TS) and the transport stream for the side service (additional service TS) are generated by the same system time clock at the transmitting side. Therefore, after extracting the PCR transport stream only from the transport stream for the basic service by the first packet filter 411, a system time clock can be generated and used as the clock of the entire system.

Meanwhile, although the transport stream for the basic service and the transport stream for the additional service are generated at the same time in the source encoder unit 110, they may have different delay times in the process of being transmitted through broadcast networks of different paths (channels). .

Therefore, in an exemplary embodiment of the present invention, the base source decoder 372 and the additional source decoder 374 are compensated for by the first and second buffers 413 and 433, the buffer controller 453, and the system time clock corrector 455. Performs synchronized decoding so that the base service and the supplementary service can be played at the same time.

The buffer control unit 453 stores the transport streams input to the two buffers (the first buffer 413 and the second buffer 433), and then, through the PCR transport stream and the second packet filter 431 of the basic service. By comparing the extracted PCR transport streams of the supplementary service, it is possible to control when the transport stream for the basic service and the transport stream for the supplementary service are output.

That is, the buffer controller 453 buffers and delays the PCR transport stream of the base service and the PCR transport stream of the supplementary service in time according to the comparison result, thereby delaying the transport stream and the supplementary service of the base service. The transport stream may be controlled to be output at the same time.

The system time clock correction unit 455 is a system for a transport stream of a service whose transmission is delayed due to a delay in the first buffer 413 or the second buffer 433 based on the mutual comparison result of the PCR transport streams. The time clock can be corrected.

The simplest corrected system time clock can be obtained by the difference between the input system time clock and the delay time in the buffer (system time clock-buffer delay time). Here, the system time clock may be locked to the source encoder of the transmitter corresponding to the receiver.

The controller 450 (more precisely, the buffer controller 453) may receive a control mode of basic / high quality service which is directly input by a user or controlled by service information received from a transmitter.

If the control mode of the basic / high quality service is selected as the basic mode to instruct to output the basic service, the buffer controller 453 operates only blocks for providing the basic service.

When the service mode is selected as the default mode, the synchronization process between the base service and the supplementary service is not necessary, and a separate delay process is not required in the buffer. Therefore, the buffer controller 453 may include the first buffer 413 as a transport stream for the base service. Controls the output so that it is immediately input.

In the case of a 3DTV broadcasting service, a basic / high quality service mode may correspond to a 2D / 3D mode for selecting a 2D or 3D service. Here, when switching from the 2D mode to the 3D mode or from the 3D mode to the 2D mode, the output point of the buffer may be changed and the screen may freeze. However, since the glasses type 3DTV requires time to wear or take off the glasses, No problem.

If a screen freeze occurs, the controller 450 may show a user a message indicating the start or end of the 3DTV service through the screen while the screen is paused.

5 is a flowchart illustrating a transmission method according to an embodiment of the present invention.

Referring to FIG. 5, the transmitting apparatus encodes elementary sources into transport streams for the basic service, and encodes an additional source coupled to the elementary sources into a transport stream for the additional service (510).

In this case, the transmitting apparatus may insert synchronized clock reference information and synchronized time stamps into transport streams for the basic service and transport streams for the additional service, respectively, using the same system time clock.

The transmitting apparatus re-multiplexes the transport streams for the base service into a single transport stream for the base service, and re-multiplexes the transport stream for the supplementary service into a single transport stream for the supplementary service (530).

The transmitting device modulates and channel encodes a single transport stream for the basic service and a single transport stream for the additional service (540).

The transmitting device outputs a single transport stream for the basic service to the broadcast channel for the basic service, and outputs a single transport stream for the additional service to the broadcast channel (550).

6 is a flowchart illustrating a receiving method according to an embodiment of the present invention.

Referring to FIG. 6, the reception apparatus demodulates and decodes a signal received through one of the broadcast channels for the basic service, extracts a transport stream provided for the basic service, and simultaneously combines the basic service with the basic service. In operation 610, the transport stream provided for the additional service is extracted by demodulating and channel decoding the signal received through the broadcast channel for the additional service.

The receiving device may control whether to perform demultiplexing on the transport stream provided for the basic service and demultiplexing on the transport stream provided for the additional service according to the control mode of the service.

That is, the receiving device determines whether the control mode of the service is the high quality mode (620), and if the control mode of the service is the high quality mode, the transmission provided for demultiplexing and additional service for the transport stream provided for the basic service All demultiplexing of the stream is performed (630).

If the control mode of the service is the basic mode instead of the high quality mode, the receiving device performs only the demultiplexing on the transport stream provided for the basic service (680), and then may perform the following processes in the same way.

The receiving device performs demultiplexing on each of the transport stream provided for the basic service and the transport stream provided for the additional service, thereby performing at least one of a transport stream for the basic service, a transport stream for the additional service, and a transport stream for the service information. The transport stream can be extracted.

Also, the receiving device may analyze the transport stream for the service information and interpret the information on the broadcast channel, the information on the virtual channel, or the service type, which are linked to each other.

The receiving device may control a system time clock such that demultiplexing of the transport stream provided for the basic service and demultiplexing of the transport stream provided for the additional service may be performed at the same time.

In order to control the system time clock, the receiving device may generate a system time clock using the PCR transport stream of the basic service extracted from the first packet filter (640).

Thereafter, the receiving apparatus compares the PCR transport stream of the basic service extracted from the first packet filter with the PCR transport stream of the supplementary service extracted from the second packet filter, thereby providing a transport stream for the basic service and a transport stream for the additional service. The output time may be controlled (650).

In this case, the system time clock of the transport stream of the service whose transmission is delayed may be corrected based on a result of the mutual comparison between the PCR transport stream of the basic service and the PCR transport stream of the additional service (660).

The receiving device decodes each of the transport stream provided for the demultiplexed basic service and the transport stream provided for the demultiplexed supplementary service and outputs the decoded source to an elementary source or an additional source coupled to the elementary source (670).

The above-described methods may be embodied in the form of program instructions that can be executed by various computer means and recorded on a computer-readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and various modifications and variations will be made to those skilled in the art to which the present invention pertains. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims below, but also by those equivalent to the claims.

110: source encoder
130: remultiplexer
150: basic service transmitter
170: integrated remultiplexer
190: additional service transmission unit

Claims (20)

At least one source encoder for encoding elementary sources into transport streams for an elementary service and encoding an additional source coupled to the elementary sources into a transport stream for an elementary service;
At least one remultiplexer for remultiplexing transport streams for the base service into a single transport stream for the base service;
An integrated remultiplexer for remultiplexing the transport stream for the supplementary service into a single transport stream for the supplementary service;
At least one basic service transmitter for modulating and channel encoding a single transport stream for the basic service and outputting the broadcast channel for the basic service; And
The additional service transmitter for modulating and channel-coding a single transport stream for the additional service and outputting the broadcast channel for the additional service
Transmission device comprising a. The method of claim 1,
The at least one source encoder unit
A basic source encoder for encoding the basic sources into transport streams for the basic service; And
An additional source encoder that encodes an additional source coupled to the elementary sources into a transport stream for the additional service
Including,
The basic source encoder and the additional source encoder
And transmitting synchronized clock reference information and synchronized time stamps into the transport streams for the base service and the transport stream for the additional service, respectively, using the same system time clock. The method of claim 1,
And a descriptor for notifying an associated virtual channel in different broadcast channels is inserted into a transport stream for the basic service or a transport stream for the additional service. The method of claim 3,
Descriptor for notifying the associated virtual channel in the different broadcast channel
A value for identifying a descriptor for describing channel interworking information, a type of service provided through interworking in the broadcast channel, the number of broadcast channels for the additional service to be linked to a broadcast channel for the basic service, and the broadcast Transmission apparatus including at least one of the information for indicating the position of the virtual channel to be interlocked in the channel. A basic service receiver for demodulating and channel decoding a signal received through one of the broadcast channels for a basic service and extracting a transport stream provided for the basic service;
An additional service receiver for demodulating and channel decoding a signal received through a broadcast channel for an additional service coupled to the basic service to extract a transport stream provided for the additional service;
For each transport stream provided for the base service and the transport stream provided for the supplementary service for extracting at least one transport stream of a transport stream for the base service, a transport stream for the supplementary service, and a transport stream for the service information. An integrated demultiplexer for performing demultiplexing; And
A source decoder for decoding each of the transport stream provided for the demultiplexed supplementary service and the transport stream provided for the demultiplexed supplementary service to output a primary source or an additional source coupled to the primary source;
Receiving device comprising a. The method of claim 5,
Service information analysis unit for analyzing the transport stream for the service information extracted from the integrated demultiplexer to interpret the information including the associated broadcast channel, virtual channel or service type
Receiving device further comprising. The method of claim 5,
The integrated demultiplexer
And a reception device for performing synchronization between the transport stream provided for the basic service and the transport stream provided for the additional service. The method of claim 5,
The integrated demultiplexer
A basic service demultiplexer which demultiplexes the transport stream provided for the basic service;
An additional service demultiplexer which demultiplexes the transport stream provided for the additional service; And
Control unit for controlling a system time clock so that the output of the basic service demultiplexer and the additional service demultiplexer is made at the same time
Receiving device comprising a. The method of claim 8,
The control unit
And a reception device controlling whether the basic service demultiplexer and the additional service demultiplexer operate according to a control mode of a service. The method of claim 8,
The control unit
When the stop occurs on the screen in accordance with the switching from the 2D mode to the 3D mode or from the 3D mode to the 2D mode, the receiving device for providing a message to the user notifying the start or end of the 3DTV service while the stop occurs. The method of claim 8,
The basic service demultiplexer
A first packet filter for extracting a transport stream for the basic service or a transport stream for the service information from a transport stream provided for the basic service;
A first buffer to temporarily store a transport stream for the basic service; And
A first packet decoder for decoding a transport stream for the basic service output from the first buffer
Including,
The additional service demultiplexer
A second packet filter for extracting a transport stream for the supplementary service from the transport stream provided for the supplementary service;
A second buffer to temporarily store a transport stream for the supplementary service; And
A second packet decoder for decoding a transport stream for an additional service output from the second buffer
Receiving device comprising a. The method of claim 11,
The control unit
A system time clock generator configured to generate a system time clock using a PCR transport stream of the basic service extracted through the first packet filter;
A buffer controlling the time point at which the transport stream for the base service and the transport stream for the supplementary service are output by comparing the PCR transport stream of the base service with the PCR transport stream of the supplementary service extracted through the second packet filter. Control unit; And
A system time clock correction unit for correcting the system time clock for a transport stream of a service whose transmission is delayed based on a result of the mutual comparison of the PCR transport streams
Receiving device comprising a. The method of claim 12,
The buffer control unit
According to the result of the comparison, the PCR transport stream of the base service and the PCR transport stream of the supplementary service are buffered and delayed in advance so that the transport stream of the base service and the transport stream of the supplementary service are at the same time point. A receiving device that controls the transmission. Encoding elementary sources into transport streams for an elementary service and encoding an additional source coupled to the elementary sources into a transport stream for an elementary service;
Remultiplexing the transport streams for the base service into a single transport stream for the base service, and remultiplexing the transport stream for the supplementary service into a single transport stream for the supplementary service;
Modulating and channel coding a single transport stream for the basic service and outputting the broadcast channel for the basic service, and modulating and channel coding the single transport stream for the additional service and outputting the broadcast channel for the additional service.
Transmission method comprising a. The method of claim 14,
The encoding step
Inserting synchronized clock reference information and a synchronized time stamp into transport streams for the base service and transport stream for the supplementary service using the same system time clock
Transmission method further comprising. Extracting a transport stream provided for the basic service by demodulating and channel decoding a signal received through one of the broadcast channels for the basic service;
Demodulating and channel decoding a signal received through a broadcast channel for an additional service coupled to the basic service to extract a transport stream provided for the additional service;
For each transport stream provided for the base service and the transport stream provided for the supplementary service for extracting at least one transport stream of a transport stream for the base service, a transport stream for the supplementary service, and a transport stream for the service information. Performing demultiplexing; And
Decoding each of the transport stream provided for the demultiplexed supplementary service and the transport stream provided for the demultiplexed supplementary service to output a primary source or an additional source coupled to the primary source;
Receiving method comprising a. The method of claim 16,
Analyzing information including a broadcast channel, a virtual channel, or a service type to be linked by analyzing a transport stream for the service information;
Receiving method further comprising. The method of claim 16,
Performing the demultiplexing is
Performing demultiplexing on a transport stream provided for the base service and demultiplexing on a transport stream provided for the additional service; And
Controlling a system time clock such that the demultiplexing is performed at the same time
Receiving method comprising a. The method of claim 18,
Controlling whether to perform demultiplexing on a transport stream provided for the base service and demultiplexing on a transport stream provided for the additional service according to a control mode of a service
Receiving method further comprising. The method of claim 18,
The step of controlling the system time clock (system time clock)
Generating a system time clock using the PCR transport stream of the base service;
Comparing the PCR transport stream of the base service with the PCR transport stream of the supplementary service and controlling a time point at which a transport stream for the base service and a transport stream for the supplementary service are output; And
Correcting the system time clock for the transport stream of the service whose transmission is delayed based on the result of the mutual comparison of the PCR transport streams.
Receiving method comprising a.

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