Broadcast signal transmitting apparatus and broadcast signal transmitting method

An apparatus for transmitting a broadcast service, the apparatus comprising:

• a hardware processor configured to:
• generate a first media stream and a second media stream of the broadcast service,
• wherein the first media stream carries a first media component of the broadcast service, and the second media stream carries a second media component of the broadcast service,
• wherein a header of a Layered Coding Transport (LCT) packet carrying the first media stream includes codepoint information for identifying a type of a payload that is carried by the LCT packet, transport object identification information for identifying an object within a transport session to which the payload of the LCT packet belongs, a first extension header having a timestamp field for a presentation time of the LCT packet and a second extension header having a Sender Current Time (SCT) field for providing a sender current time and an Expected Residual Time (ERT) field for indicating an expected remaining time for transmission of the object, and
• wherein the timestamp field is set based on a delay time and the SCT, and
• generate a signaling data stream of the broadcast service;
• a time interleaver configured to time interleave the first media stream, wherein the first media stream is time-interleaved by column-wise writing actual Forward Error Correction (FEC) blocks including the first media stream in a Time Interleaving (TI) memory that includes one or more virtual FEC blocks and diagonal-wise reading the first media stream in the actual FEC blocks from the TI memory, wherein the one or more virtual FEC blocks are skipped during the diagonal-wise reading the written first media stream, wherein a number of the one or more virtual FEC blocks is equal to a difference between a number of the actual FEC blocks and a column number of the TI memory, and wherein information for obtaining the column number of the TI memory is signaled in physical layer signaling information;
• a broadcast transmitter configured to transmit the time-interleaved first media stream, the physical layer signaling information and the signaling data stream through a broadcast network;
• and
• a network interface configured to transmit the second media stream to a receiver through a broadband network,
• wherein the signaling data stream transmitted through the broadcast network includes first timeline information used for specifying a timeline of the first media component transmitted through the broadcast network and second timeline information used for specifying a timeline of the second media component transmitted through the broadband network, and
• wherein the first media component and the second media component are time-aligned to a common timeline.

A method for receiving a broadcast service, the method comprising:

• receiving, by a broadcast receiver, a first media stream, physical layer signaling information and a signaling data stream of the broadcast service through a broadcast network,
• wherein the first media stream carries a first media component of the broadcast service,
• wherein a header of a Layered Coding Transport (LCT) packet carrying the first media stream includes codepoint information for identifying a type of a payload that is carried by the LCT packet, transport object identification information for identifying an object within a transport session to which the payload of the LCT packet belongs, a first extension header having a timestamp field for a presentation time of the LCT packet and a second extension header having a Sender Current Time (SCT) field for providing a sender current time and an Expected Residual Time (ERT) field for indicating an expected remaining time for transmission of the object, and
• wherein the timestamp field is set based on a delay time and the SCT;
• time deinterleaving, by a time deinterleaver, the first media stream time-interleaved by a transmitter, wherein the first media stream in the transmitter is time-interleaved by column-wise writing actual Forward Error Correction (FEC) blocks including the first media stream in a Time Interleaving (TI) memory that includes one or more virtual FEC blocks and diagonal-wise reading the first media stream in the actual FEC blocks from the TI wherein the one or more virtual FEC blocks are skipped during the diagonal-wise reading the written first media stream, wherein a number of the one or more virtual FEC blocks is equal to a difference between a number of the actual FEC blocks and a column number of the TI memory, and wherein information for obtaining the column number of the TI memory is signaled in the physical layer signaling information;
• and
• receiving, by a network interface, a second media stream through a broadband network,
• wherein the second media stream carries a second media component of the broadcast service,
• wherein the signaling data stream received through the broadcast network includes first timeline information used for specifying a timeline for the first media component received through the broadcast network and second timeline information used for specifying a timeline for the second media component received through the broadband network, and
• wherein the first media component and the second media component are time-aligned to a common timeline.

An apparatus for receiving a broadcast service, the apparatus comprising:

• a broadcast receiver configured to receive a first media stream, physical layer signaling information and a signaling data stream of the broadcast service through a broadcast network,
• wherein the first media stream carries a first media component of the broadcast service,
• wherein a header of a Layered Coding Transport (LCT) packet of the first media stream includes codepoint information for identifying a type of a payload that is carried by the LCT packet, transport object identification information for identifying an object within a transport session to which the payload of the LCT packet belongs, a first extension header having a timestamp field for a presentation time of the LCT packet and a second extension header having a Sender Current Time (SCT) field for providing a sender current time and an Expected Residual Time (ERT) field for indicating an expected remaining time for transmission of the object, and
• wherein the timestamp field is set based on a delay time and the SCT;
• a time deinterleaver configured to time deinterleave the first media stream time-interleaved by a transmitter, wherein the first media stream in the transmitter is time-interleaved by column-wise writing actual Forward Error Correction (FEC) blocks including the first media stream in a Time Interleaving (TI) memory that includes one or more virtual FEC blocks and diagonal-wise reading the first media stream in the actual FEC blocks from the TI memory, wherein the one or more virtual FEC blocks are skipped during the diagonal-wise reading the written first media stream, wherein a number of the one or more virtual FEC blocks is equal to a difference between a number of the actual FEC blocks and a column number of the TI memory, and wherein information for obtaining the column number of the TI memory is signaled in the physical layer signaling information;
• and
• a network interface configured to receive the second media stream through a broadband network,
• wherein the second media stream carries a second media component of the broadcast service,
• wherein the signaling data stream received through the broadcast network includes first timeline information used for specifying a timeline for the first media component received through the broadcast network and second timeline information used for specifying a timeline for the second media component received through the broadband network, and
• wherein the first media component and the second media component are time-aligned to a common timeline.