Apparatus for transmitting broadcast signals, apparatus for receiving broadcast signals, method for transmitting broadcast signals and method for receiving broadcast signals

• US 10,448,105 B2
• Filed: 09/19/2017
• Issued: 10/15/2019
• Est. Priority Date: 06/12/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Oh, Sejin, Kwon, Woosuk, Hong, Sungryong, Moon, Kyoungsoo, Lee, Jangwon, Ko, Woosuk
• Primary Examiner(s): Lonsberry, Hunter B
• Assistant Examiner(s): Newlin, Timothy R
• Application Number:
  US15/709,081
• Publication Number:
  US 20180007438A1
• Time in Patent Office: 756 Days
• CPC Class Codes: H03M 13/1102 Codes on graphs and decoding on graphs, e.g. low-density parity check [LDPC] codes
• CPC Class Codes: H03M 13/2792 Interleaver wherein interleaving is performed jointly with another technique such as puncturing, multiplexing or routing
• CPC Class Codes: H04H 20/40 Arrangements for broadcast specially adapted for accumulation-type receivers
• CPC Class Codes: H04H 60/07 characterised by processes or methods for the generation
• CPC Class Codes: H04H 60/39 for identifying broadcast space-time use of Electronic Programme Guides H04H60/72
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0075 Transmission of coding parameters to receiver H04L1/0023 takes precedence
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint
• CPC Class Codes: H04N 21/2362 Generation or processing of Service Information [SI]
• CPC Class Codes: H04N 21/2383 Channel coding or modulation of digital bit-stream, e.g. QPSK modulation arrangements for detecting or preventing errors in the information received by adapting the channel coding H04L1/0009; analogue front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 21/242 Synchronization processes, e.g. processing of PCR [Program Clock References] arrangements for synchronising broadcast or distribution via plural systems in broadcast distribution systems H04H20/18
• CPC Class Codes: H04N 21/26275 for distributing content or additional data in a staggered manner, e.g. repeating movies on different channels in a time-staggered manner in a near video on demand system
• CPC Class Codes: H04N 21/4302 Content synchronisation processes, e.g. decoder synchronisation
• CPC Class Codes: H04N 21/462 Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
• CPC Class Codes: H04N 21/85406 involving a specific file format, e.g. MP4 format
• CPC Class Codes: H04N 5/40 Modulation circuits
• CPC Class Codes: H04N 7/24 Systems for the transmission of television signals using pulse code modulation H04N21/00 takes precedence

Abstract

The present invention provides a method of transmitting broadcast signals. The method includes, formatting input streams into Data Pipe (DP) data, Low-Density Parity-Check (LDPC) encoding the DP data according to a code rate, bit interleaving the LDPC encoded DP data, mapping the hit interleaved DP data onto constellations, building at least one signal frame including the mapped DP data, and modulating data in the built signal frame by an Orthogonal Frequency Division Multiplexing (OFDM) method and transmitting the broadcast signals having the modulated data, wherein the input streams include Audio/Video (A/V) data and service guide data, and wherein the Audio/Video (A/V) data and service guide data are included in first ISO base media file format (ISOBMFF) files.

Claims

1. A method of receiving a broadcast signal by an apparatus for receiving the broadcast signal, the method comprising:

receiving the broadcast signal including link layer packets, wherein each link layer packet includes a link layer packet header and a payload, wherein a packet type of input packets encapsulated in the link layer packets is an Internet Protocol (IP) packet type or a MPEG-2 TS packet type, wherein the link layer packet header includes an information field for identifying whether a segmentation of an input packet or a concatenation of an input packet with another input packet is performed, and wherein when the packet type of the input packets is the IP packet type, headers of the input packets are compressed based on Robust Header Compression (RoHC) of unidirectional mode;

processing the broadcast signal;

decapsulating the link layer packets into the input packets based on the information field; and

decompressing the headers of the input packets based on the packet type of the input packets.

2. The method of claim 1,

wherein the input packets include Audio/Video (A/V) data,

wherein the A/V data is included in first files based on ISO base media file format (ISOBMFF),

wherein the input packets further include service guide data, and non-real time content data which are delivered in advance its use and stored in a receiving device,

wherein the service guide data is further included in the first files, and

wherein the non-real time content data are included in second files based on ISOBMFF.

3. The method of claim 2,

wherein the A/V data which are transmitted in a real-time are to be combined with the non-real time content data to present a complete content.

4. The method of claim 3,

wherein the first files include a first timeline and the second files include a second timeline, and

wherein the first timeline and the second timeline are used to synchronize the non-real time content with the A/V data.

5. The method of claim 4,

wherein the second files include a plurality of presentation units.

6. The method of claim 5,

wherein the second timeline specifies a clock rate and a start time corresponding to a first presentation unit in the second files.

7. The method of claim 5,

wherein each of the presentation units has a presentation time relative to the second timeline.

8. An apparatus for receiving a broadcast signal, the apparatus comprising:

an antenna to receive the broadcast signal including link layer packets, wherein each link layer packet includes a link layer packet header and a payload, wherein a packet type of input packets encapsulated in the link layer packets is an Internet Protocol (IP) packet type or a MPEG-2 TS packet type, wherein the link layer packet header includes an information field for identifying whether a segmentation of an input packet or a concatenation of an input packet with another input packet is performed, and wherein when the packet type of the input packets is the IP packet type, headers of the input packets are compressed based on Robust Header Compression (RoHC) of unidirectional mode; and

a processor to;

process the broadcast signal,

decapsulate the link layer packets into the input packets based on the information field, and

decompress the headers of the input packets based on the packet type of the input packets.

9. The apparatus of claim 8,

wherein the input packets include Audio/Video (A/V) data,

wherein A/V data is included in first files based on ISO base media file format (ISOBMFF),

wherein the input packets further include service guide data, and non-real time content data which are delivered in advance its use and stored in a receiving device,

wherein the service guide data is further included in the first files, and

wherein the non-real time content data are included in second files based on ISOBMFF.

10. The apparatus of claim 9,

wherein the A/V data which are transmitted in a real-time are to be combined with the non-real time content data to present a complete content.

11. The apparatus of claim 10,

wherein the first files include a first timeline and the second files include a second timeline, and

wherein the first timeline and the second timeline are used to synchronize the non-real time content with the A/V data.

12. The apparatus of claim 11,

wherein the second files include a plurality of presentation units.

13. The apparatus of claim 12,

wherein the second timeline specifies a clock rate and a start time corresponding to a first presentation unit in the second files.

14. The apparatus of claim 12,

wherein each of the presentation units has a presentation time relative to the second timeline.

15. A method of transmitting a broadcast signal by an apparatus for transmitting the broadcast signal, the method comprising:

encapsulating input packets into link layer packets, wherein each link layer packet includes a link layer packet header and a payload, wherein a packet type of the input packets is an Internet Protocol (IP) packet type or a MPEG-2 TS packet type, wherein the link layer packet header includes an information field for identifying whether a segmentation of an input packet or a concatenation of an input packet with another input packet is performed, and wherein when the packet type of the input packets is the IP packet type, headers of the input packets are compressed based on Robust Header Compression (RoHC) of unidirectional mode;

generating the broadcast signal including the link layer packets; and

transmitting the broadcast signal.

16. An apparatus for transmitting a broadcast signal, the apparatus comprising:

a processor to;

encapsulate input packets into link layer packets, wherein each link layer packet includes a link layer packet header and a payload, wherein a packet type of the input packets is an Internet Protocol (IP) packet type or a MPEG-2 TS packet type, wherein the link layer packet header includes an information field for identifying whether a segmentation of an input packet or a concatenation of an input packet with another input packet is performed, and wherein when the packet type of the input packets is the IP packet type, headers of the input packets are compressed based on Robust Header Compression (RoHC) of unidirectional mode, and

generate the broadcast signals including the link layer packets; and

an antenna to transmit the broadcast signal.