KR20100090511A - Method of transmitting and receiving a broadcast signal and apparatus for receiving a broadcast signal - Google Patents

Method of transmitting and receiving a broadcast signal and apparatus for receiving a broadcast signal Download PDF

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Publication number
KR20100090511A
KR20100090511A KR1020090009838A KR20090009838A KR20100090511A KR 20100090511 A KR20100090511 A KR 20100090511A KR 1020090009838 A KR1020090009838 A KR 1020090009838A KR 20090009838 A KR20090009838 A KR 20090009838A KR 20100090511 A KR20100090511 A KR 20100090511A
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KR
South Korea
Prior art keywords
service
description information
information
service description
segment
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KR1020090009838A
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Korean (ko)
Inventor
설주환
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엘지전자 주식회사
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Priority to KR1020090009838A priority Critical patent/KR20100090511A/en
Publication of KR20100090511A publication Critical patent/KR20100090511A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/35—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users
    • H04H60/37—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying segments of broadcast information, e.g. scenes or extracting programme ID
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
    • H04N21/4345—Extraction or processing of SI, e.g. extracting service information from an MPEG stream
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

The present invention relates to a broadcast signal transmission and reception method and a broadcast signal reception apparatus. According to an embodiment of the present invention, the method may include receiving a broadcast signal, obtaining a transmission unit of service description information describing a broadcast stream included in the broadcast signal, and according to a segment number included in the transmission unit of the service description information. And collecting a transmission unit, segmenting the segment into segments, and decoding service description information included in the segment. According to an embodiment of the present invention, service description information of a broadcast signal can be efficiently transmitted and received.

Description

Method of transmitting and receiving a broadcast signal and apparatus for receiving a broadcast signal

The present invention relates to a broadcast signal transmission and reception method and a broadcast signal reception apparatus.

When transmitting and receiving a broadcast signal, information describing a service or a program transmitted through the broadcast signal is also transmitted. For example, PSI (Program Specific Information), PSIP (Program and System Information Protocol) or SI (Service Information) defines information describing a service or a program included in a broadcast signal. Information describing such a service or program (hereinafter, referred to as service description information or service information) is multiplexed and transmitted together with a broadcast signal including a service / program. Information describing a service or a program such as a program and system information protocol (PSIP) or a service information (SI) may be separately transmitted in a section form having a predetermined format on a broadcast signal.

The present invention relates to a broadcast signal transmission and reception method and a broadcast signal receiving apparatus capable of efficiently transmitting and receiving broadcast signals.

The present invention relates to a broadcast signal transmission and reception method and a broadcast signal reception apparatus capable of efficiently transmitting and receiving service description information describing a broadcast signal.

According to an embodiment of the present invention, the method includes generating service description information including a number of a segment in which transmission units of service description information describing a broadcast stream are segmented, and broadcasting the multiplexed transmission unit of the generated service description information with broadcast content. It provides a broadcast signal transmission method comprising the step of generating a stream and modulating the generated broadcast stream to be transmitted as a broadcast signal.

According to another embodiment of the present invention, the method includes receiving a broadcast signal, obtaining a transmission unit of service description information describing a broadcast stream included in the broadcast signal, and according to a segment number included in the transmission unit of the service description information. And collecting a transmission unit, segmenting the segment into segments, and decoding service description information included in the segment.

Another embodiment of the present invention provides a receiver for receiving a broadcast signal, a demultiplexer for demultiplexing a transmission unit of service description information describing the broadcast stream from a broadcast stream included in the broadcast signal, and the demultiplexed transmission unit. According to an embodiment, there is provided a broadcast signal receiving method including a service information decoder which collects the transmission unit according to a segment number included in the segment, segments the segment into segments, and decodes the service description information included in the segment.

The service description information may be an event information table (EIT).

The transmission unit may be a table section.

The transmission unit may further include a table section number and a last table section number.

When there are a plurality of segments, the number of table sections included in the consecutive segments may be continuous.

The number of table sections included in the segment may vary.

The service information decoder may collect the table section using the section number and the last section number of the table section.

According to an embodiment of the present invention, it is possible to efficiently transmit and receive broadcast signals.

According to an embodiment of the present invention, service description information of a broadcast signal can be efficiently transmitted and received.

Hereinafter, embodiments of a broadcast signal transmission and reception method and a broadcast signal reception apparatus will be described with reference to the accompanying drawings so that the present invention can be easily understood.

The service description information describing the broadcast signal is transmitted in a constant transmission unit in the broadcast signal. The transmission unit is a unit called a section, and the service description information transmitted in such a section may be expressed in a table format defined in a program and system information protocol (PSIP) or service information (SI) in a broadcast signal receiving apparatus. Can be. That is, the table of service description information may be transmitted in a certain transmission unit. In this way, the service description information transmitted / received in a predetermined unit may be segmented into at least one transmission unit into one segment. For example, the transmission unit may be a table section.

Hereinafter, an IPTV (internet protocol television) is exemplified as a broadcast signal receiving apparatus among systems for transmitting and receiving broadcast signals, and EIT (event information) defined in DVB-SI (ETSI EN 300 468) as an example of service description information transmitted and received by the system. table).

For example, when segmenting an EIT table currently defined in DVB-SI, the section serial numbers of the section numbers including the event information do not increase continuously. Therefore, when receiving the service description information in the multi-section, the broadcast signal receiving apparatus may be heavily loaded to assemble the multi-section or to obtain event information from the table sections.

For example, if an EIT is sent that contains empty sections that do not contain event information, the broadcast signal reception device may take a long time to filter the received sections and parse the table containing the received sections. have. That is, the segment segmenting the received table section may include an empty table section having no information included therein.

In terrestrial broadcasting, since only event information about channels included in one transport stream is transmitted to the EIT, the burden on processing of service description information in a broadcast signal transmission / reception system is somewhat less. However, in the case of IPTV or IPTV set-top box, since the EIT includes event information for more than 100 channels, it is inconvenient to process unnecessary empty table sections when receiving multiple sections.

1 is a diagram illustrating an EIT. An EIT will be described as an example of service description information with reference to FIG. 1.

A table_id field (8 bits) represents an identifier of an event informatin table section.

section_syntax_indicator (1 bit) indicates that the EIT uses MPEG long-form syntax.

reserved_future_use (1 bit) is an unspecified area.

The reserved field (2 bits) is an unspecified area set to 11.

A section_length field (12 bits) indicates the length of the EIT section.

A service_id field (16 bits) indicates an identifier of a service related to the EIT.

The reserved field (2 bits) is an unspecified area set to 11.

The version_number field (5 bits) indicates the version of the table section. The version_number field value is changed when the contents of the table change.

A current_next_indicator field (1 bit) indicates whether the EIT table section is currently applied or applied to the next table.

A section_number field (8 bits) indicates the number of sections where event information is transmitted, that is, the section serial number. This value starts at 0 and increases by 1 as the section is increased.

The last_section_number field (8 bits) indicates the last section number of the table section.

A transport_stream_id field (16 bits) indicates an identifier of a transport stream of a broadcast signal.

The original_network_id field (16 bits) indicates a network identifier that originally transmitted a service.

A segment_last_section_number field (8 bits) indicates the last section number of the table section among the segments segmented when the EIT is segmented. For non-segmented sections, this field has the same value as the last_section_number field above.

The last_table_id field (8 bits) identifies the last table identifier used.

An event_id field (16 bits) represents an identification number of an event to be described.

A start_time field (40 bits) indicates the start time of the event in Universal Time Coordinated (UTC) and Modified Julian Date (MJD).

The duration field (24 bits) indicates the duration of the event in hours, minutes, and seconds.

A running_statsu field (3 bits) indicates the status of the event.

A free_CA_node field (1 bit) indicates whether a component stream of an event is scrambled.

A descriptor_loop_length field (12 bits) indicates the length of the following descriptor.

The last_section_number field of the EIT table section including the above information is the number of the last section filled with EIT information, not an empty section.

2 illustrates an example in which a table for service description information is segmented and transmitted when segmented and transmitted. For example, if the EIT is transmitted, three hours of program / service event information may be segmented. Thus, segment 0 becomes event information in units of three hours from now, and segment 1 includes event information in units of three hours.

Each segment is segmented into eight sections. Even if any one of the eight sections is an empty section with no information, the eight sections are segmented into one segment.

For example, if three hours of event information included in segment 0 can be transmitted in only two sections, segment 0 includes two sections and six empty sections containing event information. According to the example of FIG. 2, section 0 and section 1 include event information, and sections 2 through 7 may be transmitted to an empty section without EIT-related information.

In addition, when event information of a next three-hour unit is transmitted to segment 1, it is assumed that the event information is transmitted in only one section. The event information is then sent to section 8, and the remaining sections, section 9 through section 15, are sent to the empty section with no information.

Segment 2 again contains event information for the next three hours. If event information transmitted to segment 2 can be transmitted to three sections, sections 16 through 18 transmit corresponding event information. In addition, sections 19 and 23 may be transmitted to an empty section without EIT information.

Similarly, if segment 3 transmits event information and seven empty sections in one section, then section 24 contains the corresponding event information, and sections 25 through 31 are sent to empty sections that do not contain event information.

And, if segment 4 transmits event information and six empty sections in two sections, section 32 and section 33 include event information, and sections 34 through section 39 transmit empty sections that do not contain event information.

In the example of FIG. 2, when receiving an EIT table section using the EIT illustrated in FIG. 1, a specific segment includes a section including event information and a blank section not including event information, and includes a broadcast signal transceiver. Must send and receive empty sections like this. That is, even if event information of a three-hour unit of one segment is included only in some sections of the segment as described above, the broadcast signal transmitter / receiver must transmit and receive all sections included in the segment.

For example, since segment_last_section_number field of the EIT table section is 7 with respect to segment 0, the broadcast signal reception apparatus must receive the table section 7 to process all table sections included in the segment 0.

And, since segment_last_section_number field 15 of the EIT for segment 1, the broadcast signal reception apparatus must receive from table section 8 to table section 15 to process all table sections included in segment 1. Considering several segments, the number of sections containing event information may be discontinuous and there may be a problem in transmitting and receiving empty sections. And, the resource of the broadcast transceiver may be consumed to transmit and receive the empty section.

3 shows another embodiment of an EIT. 3, table_id field (8 bits), section_syntax_indicator (1 bit), reserved_future_use (1 bit), reserved field (2 bits), section_length field (12 bits), service_id field (16 bits), reserved field (2 bits), version_number field (5 bits), current_next_indicator field (1 bit), section_number field (8 bits), last_section_number field (8 bits), transport_stream_id field (16 bits), original_network_id field (16 bits), last_table_id field (8 bits) event_id field (16 bits), start_time field (40 bits), duration field (24 bits), running_statsu field (3 bits), and free_CA_node field (1 bit) are the same as the above-described example of EIT.

However, the segment_last_section_number field (8 bits) of the above EIT example is defined as a field called segment_number (8 bits) in this embodiment. A segment_last_section_number field (8 bits) indicates the last section number in each segment, while a segment_number (8 bits) field indicates a segment number to which each table section belongs.

In order to easily explain segment_number (8 bits) of the EIT in FIG. 3, an embodiment of a segmentation method of a table section is disclosed.

4 is a diagram illustrating an embodiment of a segmentation method of a table section. For ease of explanation, in FIG. 4, it is assumed that event information of three hours is segmented, as in the example of FIG. 2. However, the section included in each segment includes only a table section including event information. That is, the number of table sections that can be included in one segment is variable.

In this example, the number of table sections including event information in each segment is the same as that of FIG. However, the number of table sections included in each segment is variable, and the section number of the table section is continuous for a plurality of segments.

 That is, segment 0 is segmented into two sections (section 0 and section 1) containing event information. In addition, segment 1 includes one section (section 2) including event information for the next three hours. Segment 2 further includes three sections (sections 3, 4, and 5) containing the next three hours of event information.

Similarly, in segment 3, one table section (section 6) transmits three hours of event information. In Segment 4, two sections (section 7, section 8) transmit event information.

The segment_number (8 bits) field of the EIT indicates the number of a segment to which each section belongs. Therefore, the segment_number (8-bit) field values of section 0 and section 1 refer to segment 0, and the segment_number (8-bit) field value of section 2 refers to segment 1.

Accordingly, the apparatus for receiving broadcast signals can efficiently receive a plurality of table sections using the service description information only with the section_number field and the last_section_number field value, and can easily segment the table sections received with the segment_number (8 bit) field value. .

5 is a view showing an embodiment of a broadcast signal transmission and reception method according to the present invention.

In operation S110, service description information including a number of a segment in which transmission units of service description information describing a broadcast stream are segmented is generated. For example, the service description information may be an event information table (EIT) that describes event information transmitted on a three-hour basis of broadcast content to be transmitted. The transmission unit of the service description information may be a table section. For example, if the service description information is an event information table (EIT) included in DVB-SI according to the definition of ETSI EN 300 468, the segment number may be set between the original_network_id field and the last_table_id field.

The generated service description information is multiplexed into broadcast content and a transmission unit and transmitted (S120). The service technology information transmitted may be in accordance with a broadcast signal format transmitted to a medium such as terrestrial, satellite, or the Internet.

The broadcast signal transmitted as described above is received (130). For example, in the case of a broadcast signal transmitted in a terrestrial wave of a DVB format, demodulation is performed according to a demodulation scheme of a DVB signal. In the case of a signal according to Internet broadcasting, an IP packet carrying a broadcast signal is decapsulated.

A transmission unit of service description information is obtained from the received broadcast signal (S140). The transmission unit of the service description information may be a table section as described above. The service description information can be identified according to the table identifier, and both the table section of the identified table can be collected by using the section number and the last section number of the identified table section.

The transmission units having the same segment number with respect to the transmission units of the obtained service description information are segmented (S150). For example, if the service description information is an event information table (EIT) included in DVB-SI according to the definition of ETSI EN 300 468, the segment number may be set between the original_network_id field and the last_table_id field. If the service description information is an EIT, segmenting as above can easily obtain a three-hour table section.

6 is a view showing an embodiment of a broadcast signal receiving apparatus according to the present invention. An embodiment of a broadcast signal receiving apparatus includes a receiving unit 102, a demodulator 104, a network interface 202, an IP manager 204, and a controller ( A controller 206, a channel manager CM 208, a service information decoder 210, a service information database 212, a service discovery manager 214, service control manager 216, encryption / decryption unit (CAS / DRM) 218, service delivery manager 220, demultiplexer 222, an audio / video decoder 224, a display 226, a first memory 228, a system manager 230, a first A second memory 232 and a storage controller 234. The service information decoder 210, the demultiplexer 222, and the audio / video decoder 224 may be referred to as a decoder.

The receiver 102 may receive a broadcast signal including service description information. The service description information may be multiplexed with the program in a certain transmission unit such as a table section. The receiver 102 may receive a broadcast signal according to terrestrial wave, cable, or satellite broadcast.

The demodulator 104 demodulates the broadcast signal received by the receiver 102. The demodulator 104 demodulates the broadcast signal in a demodulation scheme corresponding to the modulation scheme of the received broadcast signal. For example, the demodulator 104 may demodulate the received DVB signal if the broadcast signal conforms to the DVB format.

The network interface unit 202 receives the packets received from the network and transmits the packets transmitted by the broadcast signal receiving apparatus to the network. The packet received by the network interface unit 202 from the network may include a service discovery record including service description information, for example, event information.

The IP manager 204 may process transmit / receive packets according to an IP protocol that sets source and destination information on packets received by the receiver and packets transmitted by the receiver. The IP manager 204 parses the IP packet received by the network interface unit 202. The IP manager 204 checks the destination address of the received packet, processes the packet according to the transmission / reception protocol, and outputs the packet. The service discovery record including the service description information may be included in the IP packet received by the IP manager 204. The IP manager 204 may transmit the parsed packet to the service discovery manager 214 according to the IP protocol.

The encryption unit 218 may control a conditional access (CAS) function and a digital rights management (DRM) for a packet received from the IP manager 204 or a packet received from the service delivery manager 220. Perform the function. Therefore, the packet to be transmitted is encrypted and the received packet is decrypted.

The service delivery manager 220 may control the service including the digital content received by the IP protocol in real time. For example, when controlling real-time streaming data, service data may be controlled using the Real-Time Transport Protocol / RTP Control Protocol (RTP / RTCP). The real-time streaming data may be transmitted using the RTP, and the service delivery manager 220 may parse the received data packet according to the RTP and output the parsed data packet to the demultiplexer 222. In addition, the network reception information is fed back to the server providing the service using RTCP.

The demultiplexer 222 may receive a multiplexed broadcast stream from service description information transmitted through the Internet or a broadcast signal transmitted to the receiver 102 according to an IP. The demultiplexer 222 decodes service description information and video / audio packets such as a program specific information (PSI) table section, a program and service information protocol (PSIP) table section, or a service information (SI) table section included in the broadcast signal, respectively. Can be multiplexed

The service information decoder 210 decodes the table sections including the service description information demultiplexed by the demultiplexer 222 and stores the decoded service description information in the service information database unit 212. When collecting the table section, the service information decoder 210 may decode the same table section by using a table identifier, a section number, and a last section number. When decoding the table section, the service information decoder 210 may segment the table section of the service description information according to the segment number included in the table section. The service information decoder 210 may decode a table section or a segment including the table section.

The video / audio decoder 224 decodes the video data and the audio data demultiplexed by the demultiplexer 222. The video / audio data decoded by the video / audio decoder 224 is output through an output unit. The output unit may include a display unit for outputting an image signal and a speaker for outputting an audio signal. In the example of FIG. 8, video data is provided to the user through the display unit 226, and decoded audio data is provided to the user through a speaker (not shown).

The service control manager 216 is responsible for selecting and controlling a service. For example, if a user selects a live broadcasting service such as a conventional broadcasting method, IGMP or RTSP is used. If a user selects a service such as VOD (Video On Demand), RTSP is used to include a digital content. Perform selection and control. The RTSP protocol can provide a trick mode for real time streaming.

The service discovery manager 214 controls information required to select a service provider that provides a service. When the service discovery manager 214 receives a control signal for channel selection from the channel manager 208 or the controller 206, the service discovery manager 214 may search for a service according to the control signal. The service discovery manager 214 may parse a service discovery record including service description information.

The controller 206 controls the operation of the receiver according to a user control signal received from a graphical user interface (GUI) or an on screen display (OSD) for a user. For example, upon receiving a key input related to channel selection from a user, the key input signal is transmitted to the channel manager (CM) 208. When the user requests information on the event information, the controller 206 may provide service description information including the event information to the user through the OSD.

The channel manager 208 may generate a channel map. The service may be selected according to a key input received from the controller 206, and the service discovery manager 214 may output service discovery information about the selected service. The channel manager (CM) 208 may receive the service description information from the service information decoder 210 and generate a channel map. The channel manager 208 may receive information related to a service from the service discovery manager 214 or the service information decoder 210 and generate a channel map according to each service. The channel manager 208 may control the demultiplexer 222 to selectively output an audio / video packet identifier (PID) of a channel selected by the user.

The first storage unit 228 stores setup data and the like for the system. Non-volatile memory (NVRAM) or flash memory may be used as the first storage unit.

The system manager 230 controls the overall operation of the receiver system through a power source. The second storage unit 232 receives and stores video / audio data from the video / audio decoder 224 under the control of the storage controller 234. The second storage unit 832 may perform a function such as a personal video recorder (PVR), and the storage controller 834 may control input / output of digital content such that the second storage unit 832 performs a PVR function.

The controller 206 may control the above-listed components so that a desired service is output according to a user's key input. For example, the controller 206 may control digital content to be provided to the user. Since the service discovery manager 214 obtains service event information from the service discovery record, the controller 206 may control the user to receive a service according to the service event information in the service discovery step. The service discovery manager 214 may identify and parse a payload of a service discovery record including only service event information.

The service information decoder 210 receives a table section of the service description information demultiplexed in the demultiplexer 222 or a table section received from the service discovery manager 214. The service information decoder 210 may decode service description information included in the received table section. The service information decoder 210 may segment the received at least one table section unit, and the number of each table section in each segment may vary. For consecutive segments, the section numbers of the table sections included in each segment may be assigned consecutively. Therefore, the broadcast signal receiving apparatus can efficiently receive the table section including the service description information, segment the collected table section, and decode the service description information.

In the above example, an EIT is taken as an example, and an example of transmitting and receiving a table section of service description information describing a broadcast stream centering on an IPTV receiver has been described. Even the same embodiment as described above can be performed.

Therefore, it is possible to efficiently transmit and receive broadcast signals, and in particular, to efficiently transmit and receive service description information among broadcast signals.

1 illustrates an EIT

2 is a diagram illustrating an example of segmentation and transmission and reception when a table for service description information is segmented and transmitted;

3 shows another embodiment of an EIT;

4 illustrates an embodiment of a segmentation method of a table section.

5 is a view showing an embodiment of a broadcast signal transmission and reception method according to the present invention.

6 illustrates an embodiment of a broadcast signal receiving apparatus according to the present invention.

Claims (15)

Generating service description information including a number of a segment in which transmission units of service description information describing a broadcast stream are segmented; Generating a broadcast stream obtained by multiplexing a transmission unit of the generated service description information with broadcast content; And And modulating the generated broadcast stream and transmitting the modulated broadcast stream as a broadcast signal. The method of claim 1, The service description information is an event information table (EIT). The method of claim 1, And the transmission unit is a table section. The method of claim 3, wherein The transmission unit further includes a table section number and a last table section number. The method of claim 4, wherein If the segment is plural, the number of the table section included in the consecutive segments is a continuous broadcast signal transmission method. Receiving a broadcast signal; Obtaining a transmission unit of service description information describing a broadcast stream included in the broadcast signal; And And collecting the transmission unit according to the segment number included in the transmission unit of the service description information, segmenting the transmission unit into segments, and decoding the service description information included in the segment. The method of claim 6, And the service description information is an event information table (EIT). The method of claim 6, And the transmission unit is a table section. The method of claim 8, The number of the table section included in the segment is variable broadcast signal receiving method.  The method of claim 8, The transmission unit further includes a number of a table section and information on the last transmission unit of the service description information. Receiving unit for receiving a broadcast signal; A demultiplexer for demultiplexing a transmission unit of service description information describing the broadcast stream from a broadcast stream included in the broadcast signal; And And a service information decoder for collecting and segmenting the transmission units according to segment numbers included in the demultiplexed transmission units and segmenting the transmission units into segments, and decoding the service description information included in the segments. The method of claim 11, And the service information decoder decodes service description information in which the transmission unit is a table section. The method of claim 12, And the service information decoder collects the table section using the section number and the last section number of the table section. The method of claim 12, And the service information decoder is configured to decode table sections variably included in the segment. The method of claim 11, And the service information decoder decodes service description information whose service description information is an event information table (EIT).
KR1020090009838A 2009-02-06 2009-02-06 Method of transmitting and receiving a broadcast signal and apparatus for receiving a broadcast signal KR20100090511A (en)

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