WO2017065021A1 - 受信装置、送信装置、及び、データ処理方法 - Google Patents
受信装置、送信装置、及び、データ処理方法 Download PDFInfo
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- WO2017065021A1 WO2017065021A1 PCT/JP2016/078984 JP2016078984W WO2017065021A1 WO 2017065021 A1 WO2017065021 A1 WO 2017065021A1 JP 2016078984 W JP2016078984 W JP 2016078984W WO 2017065021 A1 WO2017065021 A1 WO 2017065021A1
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- 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
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
- H04N21/43074—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen of additional data with content streams on the same device, e.g. of EPG data or interactive icon with a TV program
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- 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
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
-
- 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
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4305—Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR packets
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- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G5/00—Setting, i.e. correcting or changing, the time-indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
-
- 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
-
- 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
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
-
- 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
- H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
- H04N21/462—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
- H04N21/4622—Retrieving content or additional data from different sources, e.g. from a broadcast channel and the Internet
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- 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]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
- H04N21/84—Generation or processing of descriptive data, e.g. content descriptors
Definitions
- the present technology relates to a receiving device, a transmitting device, and a data processing method, and more particularly to a receiving device, a transmitting device, and a data processing method capable of performing processing related to time information corresponding to various operations.
- time information is transmitted in order to synchronize between the transmitting side and the receiving side.
- time information if discontinuous time occurs due to, for example, leap second (Day 2) or daylight saving time (DST), there is a possibility that normal processing may not be performed. There is a need to address this.
- a descriptor for coping with daylight saving time (DST) is defined (for example, non-patent literature 1).
- ATSC Standard Program and System Information Protocol for Terrestrial Broadcast and Cable (Doc. A65 / 2013)
- the present technology has been made in view of such a situation, and enables processing regarding time information corresponding to various operations to be performed.
- a receiving device based on a receiving unit that receives metadata including information for performing processing related to time information according to a plurality of time information corresponding to a plurality of time information, And a processing unit that performs processing related to the time information.
- the receiving device may be an independent device or an internal block that constitutes one device.
- a data processing method is a data processing method corresponding to the receiving device according to the first aspect of the present technology described above.
- metadata including information for performing processing relating to time information according to modes corresponding to a plurality of time information is received, and the metadata The processing relating to the time information is performed based on
- the transmission device includes: a generation unit that generates metadata including information for performing processing related to time information corresponding to a plurality of time information; and transmission that transmits the metadata Department and transmitter.
- the transmission device of the second aspect of the present technology may be an independent device or an internal block that constitutes one device. Further, a data processing method according to a second aspect of the present technology is a data processing method corresponding to the transmission device according to the second aspect of the present technology described above.
- metadata including information for performing processing relating to time information according to modes corresponding to a plurality of time information is generated, and the metadata Is sent.
- the receiving device is metadata including information for performing processing related to time information according to a mode corresponding to a plurality of time information, and a flag indicating insertion or deletion of a leap second. It is a receiving device provided with the receiving part which receives the metadata including, the counter which counts the value according to the flag, and the processing part which corrects the leap second of the time information according to the value of the counter.
- the receiving device of the third aspect of the present technology may be an independent device or an internal block that constitutes one device. Further, a data processing method according to a third aspect of the present technology is a data processing method corresponding to the receiving device according to the third aspect of the present technology described above.
- metadata including information for performing processing related to time information according to modes corresponding to a plurality of time information, which is a leap second
- the metadata including a flag indicating insertion or deletion is received, a value corresponding to the flag is counted, and a leap second of the time information is corrected according to the value of the counter.
- FIG. 10 is a diagram showing a basic usage of the daylight_saving descriptor throughout the year. It is a figure which shows the content of the process corresponding to time information mode. It is a figure which shows the relationship between UTC and reference
- FIG. 6 is a diagram showing the relationship between the internal time at the start of summer time (DST) and the media timeline. It is a figure which shows the example of the syntax of time information metadata.
- FIG. 1 is a diagram showing the configuration of an embodiment of a transmission system to which the present technology is applied.
- a system is a system in which a plurality of devices are logically gathered.
- the transmission system 1 includes a transmitting device 10 and a receiving device 20.
- data transmission conforming to a digital broadcast standard such as the Advanced Television Systems Committee (ATSC) 3.0, which is one of the next-generation terrestrial broadcast standards, is performed.
- ATSC Advanced Television Systems Committee
- the transmission device 10 is a transmitter that complies with the digital broadcast standard such as ATSC 3.0, and transmits a broadcast stream including contents such as a broadcast program via the transmission path 30.
- the detailed configuration of the transmitting device 10 will be described later with reference to FIG.
- the receiving device 20 is a receiver corresponding to the digital broadcast standard such as ATSC 3.0, and receives a broadcast stream transmitted from the transmitting device 10 via the transmission path 30, and reproduces contents such as a broadcast program. Do.
- the detailed configuration of the receiving device 20 will be described later with reference to FIG.
- receiving device 20 Although only one receiving device 20 is illustrated in the transmission system 1 of FIG. 1 for the sake of simplicity, a plurality of the receiving devices 20 can be provided, and the digital broadcast signal transmitted by the transmitting device 10 is The plurality of receiving devices 20 can simultaneously receive data via the transmission line 30.
- a plurality of transmitters 10 can be provided.
- Each of the plurality of transmitters 10 transmits the broadcast stream as a separate channel, for example, in a separate frequency band, and the receiver 20 receives the broadcast stream from among the respective channels of the plurality of transmitters 10.
- the channel to receive can be selected.
- the transmission path 30 is satellite broadcasting using, for example, a broadcasting satellite (BS: Broadcasting Satellite) or a communication satellite (CS: Communications Satellite) in addition to terrestrial waves (terrestrial broadcasting).
- BS Broadcasting Satellite
- CS Communications Satellite
- CATV cable broadcasting
- FIG. 2 is a diagram showing a configuration example of the transmission device 10 of FIG.
- the transmission apparatus 10 includes a component processing unit 111, an ESG processing unit 112, a processing unit 113, a packet processing unit 114, a modulation processing unit 115, and a transmission unit 116.
- the component processing unit 111 acquires the content input thereto.
- the content for example, a live content (for example, a live broadcast program such as sports relay) sent from a relay location through a transmission path or a communication line, or a recorded content (for example, Pre-recorded programs such as dramas etc. are included.
- the component processing unit 111 processes (eg, encodes and the like) data of video and audio components constituting the content, and supplies data obtained thereby to the packet processing unit 114.
- the ESG processing unit 112 acquires data of an ESG (Electronic Service Guide) which is an electronic service guide (electronic program guide).
- the ESG processing unit 112 processes ESG data and supplies the data to the packet processing unit 114.
- the processing unit 113 performs processing on information such as signaling and time information.
- the processing unit 113 includes a signaling processing unit 121 and a time information processing unit 122.
- the signaling processing unit 121 processes (generates) the signaling, and supplies the processing to the packet processing unit 114 or the modulation processing unit 115.
- LLS Link Layer Signaling
- SLS Service Layer Signaling
- the signaling also includes physical layer signaling (L1 signaling).
- the time information processing unit 122 processes (generates) time information and supplies the processing to the signaling processing unit 121.
- UTC Coordinated Universal Time
- PTP Precision Time Protocol
- LT Local Time
- time information processing unit 122 generates metadata (hereinafter referred to as time information metadata) including information for performing processing corresponding to the time information mode corresponding to a plurality of time information, and sends it to the signaling processing unit 121. Supply.
- time information metadata metadata including information for performing processing corresponding to the time information mode corresponding to a plurality of time information
- the signaling processing unit 121 processes time information or time information metadata supplied from the time information processing unit 122 as signaling, and supplies the processing to the packet processing unit 114 or the modulation processing unit 115.
- the packet processing unit 114 is supplied with video and audio component data from the component processing unit 111, ESG data from the ESG processing unit 112, and signaling data from the processing unit 113 (of the signaling processing unit 121). Be done.
- the packet processing unit 114 generates a packet using data of the component, the ESG, and the signaling.
- IP packet Internet Protocol
- UDP User Datagram Protocol
- ALP Access-layer
- Protocol Protocol
- the packet processed by the packet processing unit 114 is supplied to the modulation processing unit 115.
- the signaling including the time information or the time information metadata supplied from the signaling processing unit 121 can be stored in the extension header or the payload of a specific packet.
- the modulation processing unit 115 processes the packet supplied from the packet processing unit 114 to generate and process a physical layer frame.
- the physical layer frame is composed of a bootstrap (BS: Bootstrap), a preamble (Preamble), and a data part.
- BS Bootstrap
- Preamble preamble
- signaling including time information or time information metadata may be included in a bootstrap or preamble of a physical layer frame.
- the modulation processing unit 115 for example, error correction coding processing (for example, BCH coding, LDPC (Low Density Parity Check) coding, etc.), modulation processing (for example, OFDM (Orthogonal Frequency Division Multiplexing) modulation, etc.), etc. Processing is also performed.
- error correction coding processing for example, BCH coding, LDPC (Low Density Parity Check) coding, etc.
- modulation processing for example, OFDM (Orthogonal Frequency Division Multiplexing) modulation, etc.
- OFDM Orthogonal Frequency Division Multiplexing
- the transmission unit 116 converts the signal supplied from the modulation processing unit 115 into an RF (Radio Frequency) signal, and transmits the signal as a digital broadcast signal through the antenna 131.
- RF Radio Frequency
- the transmitter 10 is configured as described above.
- the transmission device (transmission station) on the transmission side (broadcast station) is described as if it is configured as one device, but the transmission device 10 is a block of FIG. It can be made up of a plurality of devices having each function.
- FIG. 3 is a diagram showing a configuration example of the receiving device 20 of FIG.
- the receiving apparatus 20 includes a receiving unit 211, a demodulation processing unit 212, a processing unit 213, a packet processing unit 214, a component processing unit 215, an ESG processing unit 216, and an output unit 217.
- the receiving unit 211 receives a digital broadcast signal via the antenna 231, frequency-converts the RF signal into an IF (Intermediate Frequency) signal, and supplies the signal to the demodulation processing unit 212.
- IF Intermediate Frequency
- the demodulation processing unit 212 processes the physical layer frame by processing the signal supplied from the receiving unit 211 and extracts a packet.
- the physical layer frame is composed of a bootstrap, a preamble, and a data part.
- the signaling is supplied to (the signaling processing unit 221 of) the processing unit 213.
- the demodulation processing unit 212 also performs, for example, processing such as demodulation processing (for example, OFDM demodulation and the like) and error correction decoding processing (for example, LDPC decoding and BCH decoding and the like).
- demodulation processing for example, OFDM demodulation and the like
- error correction decoding processing for example, LDPC decoding and BCH decoding and the like.
- the signal processed by the demodulation processing unit 212 is supplied to the packet processing unit 214.
- the packet processing unit 214 processes the packet supplied from the demodulation processing unit 212.
- processing for an ALP packet is performed, and further, processing for an IP packet extracted from the ALP packet is performed.
- an IP packet including video and audio components, ESG, and signaling data is obtained.
- the component data is supplied to the component processing unit 215, the ESG data is supplied to the ESG processing unit 216, and the signaling data is supplied to (the signaling processing unit 221 of) the processing unit 213.
- the processing unit 213 performs processing regarding information such as signaling and time information.
- the processing unit 213 includes a signaling processing unit 221 and a time information processing unit 222.
- the signaling processing unit 221 is supplied with signaling from the demodulation processing unit 212 or the packet processing unit 214.
- signaling from the demodulation processing unit 212 for example, there is L1 signaling, signaling including time information or time information metadata.
- signaling from the packet processing unit 214 there is signaling including LLS signaling, SLS signaling, time information or time information metadata.
- the signaling processing unit 221 processes signaling, and controls the operation of each unit, for example, according to the processing result. Also, the signaling processing unit 221 processes signaling including time information or time information metadata and supplies the processed information to the time information processing unit 222.
- the time information processing unit 222 performs processing related to time information based on the time information or time information metadata supplied from the signaling processing unit 221. Also, the time information processing unit 222 controls the component processing unit 215 or the ESG processing unit 216 according to the result of the process related to the time information.
- the time information processing unit 222 can have an internal counter 222A.
- the component processing unit 215 processes (for example, decodes) data of video and audio components supplied from the packet processing unit 214 according to control from the processing unit 213, and supplies the processed data to the output unit 217.
- the output unit 217 outputs video and audio corresponding to the data of the component supplied from the component processing unit 215.
- the ESG processing unit 216 processes the ESG data supplied from the packet processing unit 214 according to the control from the processing unit 213, and supplies the processed ESG data to the output unit 217.
- the output unit 217 displays an electronic service guide corresponding to the data of the ESG supplied from the ESG processing unit 216.
- the receiving device 20 is configured as described above.
- the receiving device 20 is a mobile receiver such as a mobile phone, a smart phone, or a tablet terminal in addition to a television receiver, a set top box (STB: Set Top Box), or a fixed receiver such as a recorder. It is also good. Further, the receiving device 20 may be an on-vehicle device mounted on a vehicle.
- time information is transmitted, and clock synchronization or presentation using this time information is performed. Processing such as synchronization is realized.
- time information information of a time defined by UTC (Coordinated Universal Time: Coordinated Universal Time), PTP (Precision Time Protocol), or local time (LT: Local Time) can be used.
- UTC Coordinated Universal Time
- PTP Precision Time Protocol
- LT Local Time
- UTC Coordinated Universal Time
- TAI International Atomic Time
- UT1 that is, the rotation of the earth
- the standard time around the world is determined based on UTC.
- a region using a common standard time is called a time zone, and when indicating the standard time of the region, it is represented by the difference from UTC.
- Eastern Standard Time EST
- Pacific Standard Time PST
- PST Pacific Standard Time
- PTP is information representing an 80-bit time defined in IEEE 1588-2008.
- the 80-bit PTP is composed of a 48-bit second field and a 32-bit nanosecond field.
- PTP has the advantage of facilitating control since no leap seconds are inserted or deleted.
- the local time (LT) is the standard time of each time zone.
- LT is the standard time of each time zone.
- the content transmitted from the broadcasting station (the transmitting device 10) is local time It is encoded according to. Therefore, in particular, there is a reality that the local station strongly desires to operate at local time.
- processing using time information there are processing such as clock synchronization, presentation synchronization, ESG (Electronic Service Guide) display, time display and the like.
- ESG Electronic Service Guide
- Clock synchronization means that the frequency of the system clock generated by (the clock generation unit of) the transmission device 10 and the frequency of the system clock generated by (the clock generation unit of the reception device 20) become the same frequency. means.
- the reception apparatus 20 realizes the clock synchronization because a break such as frame skipping occurs while the reception of the digital broadcast signal is continued. There is a need to.
- time information of (the time information processing unit of) the transmitting device 10 and time information of (the time information processing unit of (the receiving device 20) are matched, and time information for each presentation unit of component (media) It means that time information) is added to the packet storing (the data of) the component.
- the receiving apparatus 20 can synchronize video and audio when reproducing content, and can appropriately present the content without breaking the buffer. It disappears.
- ESG is an electronic service guide (electronic program guide) conforming to the regulations of OMA (Open Mobile Alliance) and the like. ESG is displayed with contents according to the local time of each time zone. That is, for example, in the United States of America, it is assumed that ESG data is created as common to National wide, but when displaying ESG, it is displayed in local time of each time zone There is a need to.
- OMA Open Mobile Alliance
- the time display is a time displayed on the screen of the receiving device 20, and is displayed at a time according to the local time of each time zone. That is, for example, in the United States, since there are multiple time zones in the country, when displaying the time, it is necessary to display the local time of each time zone.
- time formats such as UTC, PTP, and local time are assumed as time information, and therefore, it is necessary to cope with this. Moreover, since the content of the process in the receiver 20 differs for every time format, it is necessary to also respond to it. On the other hand, when handling time information in the transmission system 1, it is necessary to consider leap seconds and summer time.
- the leap second is based on a global agreement such that UTC, which advances in synchronization with TAI (international atomic time), does not significantly deviate from world time (UT1) over many years due to changes in earth's rotation speed.
- TAI international atomic time
- Daylight Saving Time is a system that advances standard time by one hour, or its advanced time, for the purpose of effectively using the time zone when the sun is out, in a period centered on summer in a year. Represent. However, in some areas, the difference between summer time and normal time may be defined as 30 minutes instead of one hour. In addition to daylight saving time (Daylight Saving Time), summer time is also referred to as summer time.
- a daylight_saving descriptor is defined as a descriptor for coping with daylight saving time.
- This daylight_saving descriptor has a structure as shown in FIG.
- 1-bit DS_status represents a daylight saving time (DST) period.
- the 5-bit DS_day_of_month represents a date when daylight saving time (DST) starts or ends.
- the 8-bit DS_hour represents the time when daylight saving time (DST) starts or ends.
- FIG. 5 also shows the basic usage of the daylight saving descriptor (FIG. 4) throughout the year.
- a time information mode corresponding to a plurality of time information is defined, and information for performing processing corresponding to a plurality of time formats (for example, processing corresponding to leap seconds and summer time (DST) is performed By transmitting the time information metadata including the information), it is possible to perform the process related to the time information corresponding to various operations according to the time information mode.
- FIG. 6 is a diagram showing the contents of processing corresponding to the time information mode.
- a time information mode is defined for each format of time information (time format).
- time format UTC (Coordinated Universal Time), PTP, or local time (LT) is used.
- the time information mode is UTC.
- the processing content differs depending on whether the time zone of the component and ESG timeline is UTC or a time zone other than UTC.
- UTC mode A when the zone is UTC
- UTC mode B the UTC mode when it is a time zone other than UTC
- the time information mode is PTP mode.
- PTP mode A the PTP mode when the time zone of the component and ESG timeline is UTC
- PTP mode B the PTP mode when it is a time zone other than UTC
- the time information mode is local time mode.
- the local time mode when the time zone of the component and ESG timeline is UTC is referred to as local time mode A
- the local time mode when the time zone is other than UTC is the local time mode. It distinguishes it as time mode B.
- the time format may be local time
- the time zone of the timeline of the component and the ESG may be local time.
- Local time mode C The detailed contents of the time information processing on the transmission side and the reception side corresponding to the local time mode C will be described later with reference to FIG.
- UTC mode A is a time information mode when the time format is UTC and the time zone of the component and ESG timeline is UTC.
- UTC mode A when clock synchronization using UTC as time information is performed in the receiving apparatus 20, offset value correction is performed to correct a leap second.
- offset value correction is performed in the reception device 20
- offset value correction is performed using offset information (offset value) included in time information metadata sent from the transmission device 10.
- this offset value is the difference between the reference time and UTC, as shown in FIG.
- the horizontal axis represents the elapsed time
- the vertical axis represents the time
- the difference between the reference time L0 represented by the dotted line and the UTC time L1 represented by the solid line is the offset value D Be done.
- the reference time for example, a time format such as PTP or TAI (international atomic time) that does not perform correction such as leap second is adopted. Therefore, as shown in FIG. 7, the reference time L0 such as PTP can be counted linearly.
- the offset value after the leap second is inserted at time t1 is larger. That is, in the case of UTC mode A (UTC mode), the offset value is an integrated value of leap seconds.
- time display when time display (time display) or ESG display (ESG display) is performed by the receiving device 20, time zone correction is performed and converted from UTC to local time.
- time display or ESG display is performed in the receiving apparatus 20
- DST correction using discontinuous time information included in time information metadata is performed when summer time (DST) is reached, and summer time (DST) is performed.
- the local time corresponding to is processed.
- UTC mode B is a time information mode when the time format is UTC and the time zone of the component and ESG timeline is a time zone other than UTC.
- this UTC mode B as in the case of the UTC mode A, when clock synchronization is performed in the receiving device 20, offset value correction is performed to correct the leap second.
- the integrated value of the leap second which is the difference between the reference time (for example, PTP) and the UTC, is taken as the offset value.
- time zone correction is performed on the component and ESG timelines. That is, in the receiving apparatus 20, the component time zone correction converts the time zone (other than UTC) of the component timeline to the local time. Also, in the receiving device 20, the ESG time zone correction converts the time zone (other than UTC) of the ESG timeline to the local time.
- time zone correction conversion to local time
- the internal time is used for the component for which time zone correction (conversion to local time) is performed. Presentation synchronization is performed.
- the PTP mode A is a time information mode in which the time format is PTP and the time zone of the component and ESG timeline is UTC.
- PTP is used as the time format, when clock synchronization using PTP as time information is performed in the receiving apparatus 20, correction of a leap second is not necessary.
- PTP PTP time L2 represented by a solid line and reference time L0 represented by a dotted line are linear.
- the offset value is always 0, because
- PTP mode A PTP mode
- PTP needs to be converted to UTC in order to perform time display, ESG display, presentation synchronization, etc.
- a value PTP-UTC offset value for converting PTP to UTC is set. This offset value is included in the time information metadata.
- time display or ESG display is performed by the receiving device 20 in PTP mode A
- offset value correction using offset information (offset value) included in time information metadata is performed, and PTP is used. Converted to UTC.
- time zone correction is performed and converted from UTC to local time.
- DST correction using discontinuous time information included in time information metadata is performed when summer time (DST) is reached, and summer time (DST) is performed. The local time corresponding to is processed.
- PTP mode B is a time information mode when the time format is PTP and the time zone of the component and ESG timeline is a time zone other than UTC.
- PTP mode B as in the PTP mode A, when clock synchronization using PTP as time information is performed in the receiving apparatus 20, the leap second correction is not necessary.
- time zone correction is performed on the component and ESG timelines. That is, in the receiving apparatus 20, the component time zone correction converts the time zone (other than UTC) of the component timeline to the local time. Also, in the receiving device 20, the ESG time zone correction converts the time zone (other than UTC) of the ESG timeline to the local time.
- time zone correction conversion to local time
- PTP is converted to UTC
- the internal time is used for the component for which time zone correction (conversion to local time) is performed. Presentation synchronization is performed.
- the local time mode A is a time information mode when the time format is local time and the time zone of the component and ESG timeline is UTC.
- the local time mode A when clock synchronization using the local time as time information is performed in the receiving apparatus 20, offset correction is performed, and leap seconds and summer time (DST) are corrected.
- offset value correction is performed using offset information (offset value) included in time information metadata sent from the transmission device 10.
- offset value is the difference between the reference time and the local time as shown in FIG. 9 in the case of the local time mode A (local time mode).
- an offset value D is a difference between the reference time L0 represented by a dotted line and the local time L3 represented by a solid line.
- the reference time L0 for example, PTP is adopted, and it is possible to count linearly.
- the offset value fluctuates according to the summer time (DST) from t5 to time t6 when the DST end time is reached. That is, in the case of the local time mode A (local time mode), the offset value includes both the integrated value of the leap second and the variation value of the daylight saving time (DST) (heap second and daylight saving time (DST) Value).
- time zone correction is performed on the component and ESG timelines. That is, in the receiving device 20, the component time zone correction converts the time zone (UTC) of the component timeline to the local time. In the receiving device 20, the ESG time zone correction converts the time zone (UTC) of the ESG timeline to the local time.
- time zone correction conversion to local time
- the internal time is used for the component for which time zone correction (conversion to local time) is performed. Presentation synchronization is performed.
- the local time mode B is a time information mode when the time format is the local time and the time zone of the component and ESG timeline is a time zone other than UTC.
- this local time mode B as in the local time mode A, when clock synchronization is performed in the receiving device 20, offset correction is performed and leap second correction is performed.
- DST daylight saving time
- time zone correction is performed on the component and ESG timelines. That is, in the receiving apparatus 20, the component time zone correction converts the time zone (other than UTC) of the component timeline to the local time. Also, in the receiving device 20, the ESG time zone correction converts the time zone (other than UTC) of the ESG timeline to the local time.
- time zone correction conversion to local time
- the internal time is used for the component for which time zone correction (conversion to local time) is performed. Presentation synchronization is performed.
- component time zone correction and ESG time zone correction are shown in FIG. 6, when the time zone is equal to the local time, the correction is unnecessary.
- the inventor of the present application proposes a clock synchronization method in which the physical layer clock and the system clock are synchronized, which is proposed in Japanese Patent Application No. 2015-157707, time is performed in UTC mode and local time mode. In clock synchronization using information, offset value correction is not required.
- offset value correction using offset information (offset value) included in time information metadata is performed, but it is defined by the current ATSC standard.
- the daylight_saving descriptor includes only information on the start time and end time of daylight saving time (DST), and does not include this type of offset information.
- the offset information (offset value) is not limited to being included in the time information metadata and transmitted, but, for example, an equivalent offset value is calculated inside the receiving device 20 by an alternative signal (for example, Leap_Indicator). You may do so.
- the time information sent from the transmitting device 10 of the broadcasting station to the receiving device 20 is generally generated from GPS time.
- GPS time is information of time measured using GPS (Global Positioning System).
- GPS Global Positioning System
- the GPS-UTC conversion unit 141 transmits GPS time according to the UTC parameter (for example, the leap second offset value). By converting, it is possible to obtain information of time specified in UTC.
- the UTC parameter is shown in FIG.
- the UTC-Local conversion unit 142 converts UTC according to parameters such as time zone and daylight saving time (DST). , You can get local time.
- the signaling generation unit 143 sets time information in the availabilityStartTime attribute included in MPD (Media Presentation Description) metadata, the time may also be set according to parameters such as time zone and daylight saving time (DST). Information is corrected.
- the MPD metadata is control information for managing reproduction of component (media) streams. Also, MPD metadata conforms to the MPEG-DASH (Dynamic Adaptive Streaming over HTTP) standard.
- FIG. 12 is a diagram showing an outline of processing on the transmission side and the reception side corresponding to the UTC mode A.
- the time information conversion unit 151 corresponds to the time information processing unit 122 of FIG. 2.
- the clock synchronization unit 251, the presentation synchronization unit 252, and the time / ESG display processing unit 253 are the time information processing unit 222, the component processing unit 215, and the ESG processing unit of FIG. It corresponds to 216 etc. Note that these relationships are the same in other drawings (for example, FIG. 14) described later.
- the GPS time and offset information are input to the time information conversion unit 151.
- the time information conversion unit 151 converts the GPS time into UTC by correcting the difference between the GPS time and the UTC using offset information as the UTC parameter.
- UTC as time information can be obtained.
- time information metadata is generated.
- the time information metadata includes a time information mode, offset information, time zone information, and discontinuous time information.
- the UTC mode is set as the time information mode.
- offset information for example, an offset value between a reference time (for example, PTP) and UTC is set.
- time zone information information ( ⁇ 12 with respect to UTC) representing the standard time of the region expressed as a difference from UTC is set.
- discontinuous time information as information on time that becomes discontinuous such as leap second and summer time (DST), the date and time when the time becomes discontinuous next, change amount of time when the next becomes discontinuous, discontinuity The type of time when it becomes
- the transmitting device 10 transmits a broadcast stream including UTC as time information and time information metadata to the receiving device 20 via the transmission path 30. Also, in the transmitting device 10, video and audio components and (the data of) ESG are processed and included in the broadcast stream. However, in the case of the UTC mode A, the time zone of the component and the timeline of the ESG is set to UTC.
- the broadcast stream transmitted from the transmitting device 10 via the transmission path 30 is received.
- the broadcast stream includes UTC as time information, time information metadata, video and audio components, ESG (data) and the like.
- the receiving device 20 operates in the UTC mode A (UTC mode) according to the time information mode included in the time information metadata.
- the clock synchronization unit 251 receives the UTC as time information and the offset information included in the time information metadata.
- the clock synchronization unit 251 performs clock synchronization using UTC as time information.
- the clock synchronization unit 251 corrects a leap second by performing offset value correction using offset information (offset value).
- the leap second is corrected by using this offset value. That is, here, since it is necessary to be able to count time information used in clock synchronization linearly, it is possible to match the reference time by performing offset value correction.
- the clock synchronization unit 251 supplies the UTC as the internal time to the presentation synchronization unit 252 and the time / ESG display processing unit 253.
- the presentation synchronization unit 252 receives the internal time (UTC) from the clock synchronization unit 251, (the data of the component whose timeline time zone is UTC), and the discontinuous time information included in the time information metadata. Ru.
- the presentation synchronization unit 252 realizes presentation synchronization by processing (the data of) the component in which the time zone of the timeline is UTC using the internal time (UTC) from the clock synchronization unit 251. Then, the presentation synchronization unit 252 outputs (data of) the presentation synchronized video and audio components.
- this presentation synchronization for example, when playing back content, it becomes possible to synchronize video and audio and appropriately present it without breaking the buffer.
- the presentation synchronization unit 252 receives information on leap seconds, which is input as discontinuous time information as necessary (for example, a date or time when adjustment of the next leap second is performed, etc. Processing) can be performed.
- the time / ESG display processing unit 253 includes internal time (UTC) from the clock synchronization unit 251, ESG (data) in which the time zone of the timeline is UTC, time zone information included in time information metadata, and Discontinuous time information is input.
- UTC internal time
- ESG data
- time zone information included in time information metadata
- Discontinuous time information is input.
- the time / ESG display processing unit 253 When the time display is performed, the time / ESG display processing unit 253 performs time zone correction based on the time zone information, and converts the internal time (UTC) into the local time. Then, the time / ESG display processing unit 253 causes the time corresponding to the local time to be displayed.
- the time / ESG display processing unit 253 performs time zone correction based on time zone information, and processes ESG (data) in which the time zone of the timeline is UTC. , Convert ESG time zone (UTC) to local time. Then, the time / ESG display processing unit 253 causes the ESG corresponding to the local time to be displayed.
- DST daylight saving time
- discontinuous time information for example, the date or time of the next daylight saving time (DST), the period thereof, Etc.
- DST correction for example, standard time (local time) is advanced by one hour, and processing at local time corresponding to summer time (DST) is enabled.
- time information metadata including information (for example, offset information etc.) for performing time information processing corresponding to the UTC mode A together with the UTC as time information
- the receiving device 20 can perform time information processing according to the UTC mode A using the time information metadata.
- FIG. 13 is a diagram showing an outline of processing on the transmission side and the reception side corresponding to the UTC mode B.
- the time information conversion unit 151 corresponds to the time information processing unit 122 of FIG. 2.
- the clock synchronization unit 251, the presentation synchronization unit 252, the time / ESG display processing unit 253, the component time zone correction unit 254, and the ESG time zone correction unit 255 It corresponds to the processing unit 222, the component processing unit 215, the ESG processing unit 216, and the like. Note that these relationships are the same in other drawings (for example, FIGS. 15 to 17) described later.
- the time information conversion unit 151 converts the GPS time into UTC by correcting the difference between the GPS time and the UTC using offset information as a UTC parameter.
- UTC as time information can be obtained.
- time information metadata is generated.
- the time information metadata includes a time information mode, offset information, component time zone information, time zone information, discontinuous time information, and ESG time zone information.
- the time information mode, the offset information, the time zone information, and the discontinuous time information are the same as in the UTC mode A (FIG. 12) described above, the description thereof is omitted.
- the component time zone information sets the time zone of the component.
- the ESG time zone information sets the ESG time zone.
- the transmitting device 10 transmits a broadcast stream including UTC as time information and time information metadata to the receiving device 20 via the transmission path 30. Also, in the transmitting device 10, video and audio components and (the data of) ESG are processed and included in the broadcast stream. However, in the case of UTC mode B, the time zone of the component and the timeline of the ESG is taken as a time zone other than UTC.
- the broadcast stream transmitted from the transmitting device 10 via the transmission path 30 is received.
- the broadcast stream includes UTC as time information, time information metadata, video and audio components, ESG (data) and the like.
- the receiving device 20 operates in the UTC mode B (UTC mode) according to the time information mode included in the time information metadata.
- the clock synchronization unit 251 receives the UTC as time information and the offset information included in the time information metadata.
- the clock synchronization unit 251 performs clock synchronization using UTC as time information.
- the clock synchronization unit 251 corrects a leap second by performing offset value correction using offset information (offset value). That is, here, since the offset value between the reference time (for example, PTP) and the UTC represents the integrated value of the leap second, the leap second is corrected by using this offset value.
- offset value offset information
- the clock synchronization unit 251 supplies the UTC as the internal time to the presentation synchronization unit 252 and the time / ESG display processing unit 253.
- the component time zone correction unit 254 receives (the data of) a component whose time zone of the timeline is a time zone other than UTC, component time zone information and time zone information included in the time information metadata.
- the component time zone correction unit 254 performs component time zone correction based on the component time zone information and the time zone information, and converts the time zone (other than UTC) of the component to the local time. Then, the component time zone correction unit 254 supplies (the data of) the component after the time zone correction to the presentation synchronization unit 252.
- the presentation synchronization unit 252 receives the internal time (UTC) from the clock synchronization unit 251, (the data of) the component from the component time zone correction unit 254, and the discontinuous time information included in the time information metadata. .
- the presentation synchronization unit 252 realizes presentation synchronization by processing (the data of) the component whose time zone of the timeline is the local time according to the internal time (UTC) from the clock synchronization unit 251. Then, the presentation synchronization unit 252 outputs (data of) the presentation synchronized video and audio components. In addition, when performing presentation synchronization, the presentation synchronization unit 252 can perform processing using discontinuous time information (for example, information on leap seconds) as necessary.
- discontinuous time information for example, information on leap seconds
- the ESG time zone correction unit 255 receives ESG (data) whose time zone is a time zone other than UTC, and ESG time zone information and time zone information included in time information metadata.
- the ESG time zone correction unit 255 performs ESG time zone correction based on the ESG time zone information and time zone information, and converts an ESG time zone (other than UTC) into local time. Then, the ESG time zone correction unit 255 supplies (the data of) the ESG after time zone correction to the time / ESG display processing unit 253.
- the time / ESG display processing unit 253 includes the internal time (UTC) from the clock synchronization unit 251, (the data of) the ESG from the ESG time zone correction unit 255, and the discontinuous time information included in the time information metadata. It is input.
- the time / ESG display processing unit 253 displays the time corresponding to the local time by processing the internal time (UTC) and (the data of) the ESG, for example.
- the time / ESG display processing unit 253 causes the ESG corresponding to the local time to be displayed by processing (the data of) the ESG in which the time zone of the timeline is the local time.
- the time / ESG display processing unit 253 can perform processing using discontinuous time information (for example, information regarding a leap second) as necessary.
- time information metadata including information (for example, offset information etc.) for performing time information processing corresponding to the UTC mode B together with the UTC as time information
- the receiving device 20 can perform time information processing according to the UTC mode B using the time information metadata.
- FIG. 14 is a diagram showing an outline of processing on the transmission side and the reception side corresponding to the PTP mode A.
- FIG. 14 data transmitted from the transmitter 10 of the broadcast station on the left side in the figure is received by the receiver 20 on the right side in the figure, and time information processing according to PTP mode A is performed in the receiver 20. The situation is shown.
- the time information conversion unit 151 converts the GPS time input thereto into PTP. Thereby, PTP as time information is obtained.
- time information metadata is generated.
- the time information metadata includes a time information mode, offset information, time zone information, and discontinuous time information.
- PTP mode is set as the time information mode.
- offset information a value (PTP-UTC offset value) for converting PTP to UTC is set.
- the transmitting device 10 transmits a PTP as time information and a broadcast stream including time information metadata to the receiving device 20 via the transmission path 30. Also, in the transmitting device 10, video and audio components and (the data of) ESG are processed and included in the broadcast stream. However, in the case of PTP mode A, the time zone of the component and the timeline of the ESG is taken as UTC.
- the broadcast stream transmitted from the transmitting device 10 via the transmission path 30 is received.
- the broadcast stream includes PTP as time information, time information metadata, video and audio components, ESG (data), and the like.
- the receiving device 20 operates in PTP mode A (PTP mode) according to the time information mode included in the time information metadata.
- the clock synchronization unit 251 performs clock synchronization using PTP as time information. However, when PTP is used as time information, it is not necessary to correct a leap second in clock synchronization.
- the clock synchronization unit 251 supplies the PTP as the internal time to the presentation synchronization unit 252 and the time / ESG display processing unit 253.
- the internal time (PTP) from the clock synchronization unit 251 (the data of the component whose timeline time zone is UTC), the offset information and the discontinuous time information included in the time information metadata Is input.
- the presentation synchronization unit 252 performs offset value correction using the PTP-UTC offset value included in the offset information, and converts the internal time (PTP) from the clock synchronization unit 251 into UTC.
- the presentation synchronization unit 252 realizes presentation synchronization by processing (the data of) a component in which the time zone of the timeline is UTC using UTC obtained by converting the internal time (PTP). Then, the presentation synchronization unit 252 outputs (data of) the presentation synchronized video and audio components.
- the presentation synchronization unit 252 can perform processing using discontinuous time information (for example, information on leap seconds) as necessary.
- the time / ESG display processing unit 253 includes offset information included in the internal time (PTP) from the clock synchronization unit 251, ESG (data) whose time zone is UTC, and time information metadata. Time zone information and discontinuous time information are input.
- the time / ESG display processing unit 253 When time display or ESG display is performed, the time / ESG display processing unit 253 performs offset value correction using the PTP-UTC offset value included in the offset information, and the internal time (PTP) from the clock synchronization unit 251. Convert to UTC.
- the time / ESG display processing unit 253 performs time zone correction based on time zone information, and converts UTC obtained by converting internal time (PTP) into local time . Then, the time / ESG display processing unit 253 causes the time corresponding to the local time to be displayed.
- the time / ESG display processing unit 253 performs time zone correction based on time zone information, and processes ESG (data) in which the time zone of the timeline is UTC. , Convert ESG time zone (UTC) to local time. Then, the time / ESG display processing unit 253 causes the ESG corresponding to the local time to be displayed.
- discontinuous time information for example, the date or time of the next daylight saving time (DST), the period thereof, Etc.
- time information metadata including information (for example, offset information etc.) for performing time information processing corresponding to PTP mode A together with PTP as time information
- the reception device 20 can perform time information processing according to PTP mode A using the time information metadata.
- FIG. 15 is a diagram showing an outline of processing on the transmission side and the reception side corresponding to the PTP mode B.
- the time information conversion unit 151 converts the GPS time input thereto into PTP. Thereby, PTP as time information is obtained.
- time information metadata is generated.
- the time information metadata includes a time information mode, offset information, component time zone information, time zone information, discontinuous time information, and ESG time zone information.
- PTP mode is set as the time information mode.
- offset information a value (PTP-UTC offset value) for converting PTP to UTC is set.
- the transmitting device 10 transmits a PTP as time information and a broadcast stream including time information metadata to the receiving device 20 via the transmission path 30. Also, in the transmitting device 10, video and audio components and (the data of) ESG are processed and included in the broadcast stream. However, in the case of PTP mode B, the time zone of the component and the timeline of the ESG is set to a time zone other than UTC.
- the broadcast stream transmitted from the transmitting device 10 via the transmission path 30 is received.
- the broadcast stream includes PTP as time information, time information metadata, video and audio components, ESG (data), and the like.
- the receiving device 20 operates in PTP mode B (PTP mode) according to the time information mode included in the time information metadata.
- clock synchronization using the PTP as time information is performed by the clock synchronization unit 251 as in the above-described PTP mode A (FIG. 14).
- the clock synchronization unit 251 supplies the PTP as the internal time to the presentation synchronization unit 252 and the time / ESG display processing unit 253.
- the component time zone correction unit 254 receives (the data of) a component whose time zone of the timeline is a time zone other than UTC, component time zone information and time zone information included in the time information metadata.
- the component time zone correction unit 254 performs component time zone correction based on the component time zone information and the time zone information, and converts the time zone (other than UTC) of the component to the local time. Then, the component time zone correction unit 254 supplies (the data of) the component after the time zone correction to the presentation synchronization unit 252.
- the internal time (PTP) from the clock synchronization unit 251 (the data of) the component from the component time zone correction unit 254, and offset information and discontinuous time information included in time information metadata are included. It is input.
- the presentation synchronization unit 252 performs offset value correction using the PTP-UTC offset value included in the offset information, and converts the internal time (PTP) from the clock synchronization unit 251 into UTC.
- the presentation synchronization unit 252 realizes presentation synchronization by processing (the data of) the component whose time zone of the timeline is the local time using the UTC obtained by converting the internal time (PTP). Then, the presentation synchronization unit 252 outputs (data of) the presentation synchronized video and audio components.
- the ESG time zone correction unit 255 receives ESG (data) whose time zone is a time zone other than UTC, and ESG time zone information and time zone information included in time information metadata.
- the ESG time zone correction unit 255 performs ESG time zone correction based on the ESG time zone information and time zone information, and converts an ESG time zone (other than UTC) into local time. Then, the ESG time zone correction unit 255 supplies (the data of) the ESG after time zone correction to the time / ESG display processing unit 253.
- the time / ESG display processing unit 253 includes the internal time (PTP) from the clock synchronization unit 251, (the data of) the ESG from the ESG time zone correction unit 255, and offset information and discontinuities included in the time information metadata. Time information is input.
- PTP internal time
- the time / ESG display processing unit 253 includes the internal time (PTP) from the clock synchronization unit 251, (the data of) the ESG from the ESG time zone correction unit 255, and offset information and discontinuities included in the time information metadata. Time information is input.
- the time / ESG display processing unit 253 When time display is performed, the time / ESG display processing unit 253 performs offset value correction using the PTP-UTC offset value included in the offset information, and calculates the internal time (PTP) from the clock synchronization unit 251 as UTC. Convert to Then, the time / ESG display processing unit 253 causes the time corresponding to the local time to be displayed by processing, for example, the UTC obtained by converting the internal time (PTP) and (the data of) the ESG.
- the time / ESG display processing unit 253 causes the ESG corresponding to the local time to be displayed by processing (the data of) the ESG in which the time zone of the timeline is the local time.
- the time / ESG display processing unit 253 can perform processing using discontinuous time information (for example, information regarding a leap second) as necessary.
- time information metadata including information (for example, offset information and the like) for performing time information processing corresponding to PTP mode B together with PTP as time information
- the receiving device 20 can perform time information processing according to PTP mode B using the time information metadata.
- FIG. 16 is a diagram showing an outline of processing on the transmission side and the reception side corresponding to the local time mode A.
- the time information conversion unit 151 converts the GPS time into the local time by correcting the difference between the GPS time and the local time using the offset information. Thereby, local time as time information is obtained.
- time information metadata is generated.
- the time information metadata includes a time information mode, offset information, time zone information, and discontinuous time information.
- the local time mode is set as the time information mode.
- offset information for example, an offset value between a reference time (for example, PTP) and a local time is set.
- the transmitting apparatus 10 transmits a local time as time information and a broadcast stream including time information metadata to the receiving apparatus 20 via the transmission path 30. Also, in the transmitting device 10, video and audio components and (the data of) ESG are processed and included in the broadcast stream. However, in the case of the local time mode A, the time zone of the component and the timeline of the ESG is taken as UTC.
- the broadcast stream transmitted from the transmitting device 10 via the transmission path 30 is received.
- the broadcast stream includes local time and time information metadata as time information, video and audio components, ESG (data), and the like.
- the receiving device 20 operates in the local time mode A (local time mode) according to the time information mode included in the time information metadata.
- the clock synchronization unit 251 receives the local time as time information and offset information included in the time information metadata.
- the clock synchronization unit 251 performs clock synchronization using local time as time information.
- the clock synchronization unit 251 corrects the leap second and the summer time (DST) by performing offset value correction using offset information (offset value).
- the offset value between the reference time (for example, PTP) and the local time is a value obtained by adding the integrated value of leap seconds and the variation value of summer time (DST) (heap second and summer time (DST) Since this represents the included value, both the leap second and the daylight saving time (DST) are corrected by using this offset value. That is, here, since it is necessary to be able to count time information used in clock synchronization linearly, it is possible to match the reference time by performing offset value correction.
- the clock synchronization unit 251 supplies the local time as the internal time to the presentation synchronization unit 252 and the time / ESG display processing unit 253.
- the component time zone correction unit 254 receives (the data of) the component whose time zone of the timeline is UTC, and the time zone information included in the time information metadata.
- the component time zone correction unit 254 performs component time zone correction based on the time zone information, and converts the component time zone (UTC) to local time. Then, the component time zone correction unit 254 supplies (the data of) the component after the time zone correction to the presentation synchronization unit 252.
- the presentation synchronization unit 252 receives the internal time (local time) from the clock synchronization unit 251, (the data of) the component from the component time zone correction unit 254, and the discontinuous time information included in the time information metadata. Ru.
- the presentation synchronization unit 252 realizes presentation synchronization by processing (components of) components in which the time zone of the timeline is the local time using the internal time (local time) from the clock synchronization unit 251. Then, the presentation synchronization unit 252 outputs (data of) the presentation synchronized video and audio components. In addition, when performing presentation synchronization, the presentation synchronization unit 252 can perform processing using discontinuous time information (for example, information on leap seconds) as necessary.
- discontinuous time information for example, information on leap seconds
- the ESG time zone correction unit 255 receives ESG (data) whose time zone in the timeline is UTC, and time zone information included in time information metadata.
- the ESG time zone correction unit 255 performs ESG time zone correction based on time zone information, and converts the ESG time zone (UTC) into local time. Then, the ESG time zone correction unit 255 supplies (the data of) the ESG after time zone correction to the time / ESG display processing unit 253.
- the time / ESG display processing unit 253 includes the internal time (local time) from the clock synchronization unit 251, (the data of) the ESG from the ESG time zone correction unit 255, and the discontinuous time information included in the time information metadata. Is input.
- the time / ESG display processing unit 253 processes the internal time (local time) from the clock synchronization unit 251 to display the time corresponding to the local time.
- the time / ESG display processing unit 253 causes the ESG corresponding to the local time to be displayed by processing (the data of) the ESG in which the time zone of the timeline is the local time.
- the time / ESG display processing unit 253 can perform processing using discontinuous time information (for example, information regarding a leap second) as necessary.
- time information including information (for example, offset information and the like) for performing time information processing corresponding to the local time mode A with the local time as the time information.
- information for example, offset information and the like
- the receiving device 20 can perform time information processing according to the local time mode A using the time information metadata.
- FIG. 17 is a diagram showing an outline of processing on the transmission side and the reception side corresponding to the local time mode B.
- FIG. 17 data transmitted from the transmitter 10 of the broadcast station on the left side in the figure is received by the receiver 20 on the right side in the figure, and time information processing according to the local time mode B is performed in the receiver 20. It is shown how to be
- the time information conversion unit 151 converts the GPS time into the local time by correcting the difference between the GPS time and the local time using the offset information. Thereby, local time as time information is obtained.
- time information metadata is generated.
- the time information metadata includes a time information mode, offset information, component time zone information, time zone information, discontinuous time information, and ESG time zone information.
- the local time mode is set as the time information mode.
- offset information for example, an offset value between a reference time (for example, PTP) and a local time is set.
- the transmitting apparatus 10 transmits a local time as time information and a broadcast stream including time information metadata to the receiving apparatus 20 via the transmission path 30. Also, in the transmitting device 10, video and audio components and (the data of) ESG are processed and included in the broadcast stream. However, in the local time mode B, the time zone of the component and the timeline of the ESG is set to a time zone other than UTC.
- the broadcast stream transmitted from the transmitting device 10 via the transmission path 30 is received.
- the broadcast stream includes local time and time information metadata as time information, video and audio components, ESG (data), and the like.
- the receiving device 20 operates in the local time mode B (local time mode) according to the time information mode included in the time information metadata.
- the clock synchronization unit 251 receives the local time as time information and offset information included in the time information metadata.
- the clock synchronization unit 251 performs clock synchronization using local time as time information.
- the clock synchronization unit 251 corrects the leap second and the summer time (DST) by performing offset value correction using offset information (offset value). That is, the offset value between the reference time (for example, PTP) and the local time is a value obtained by adding the integrated value of leap seconds and the variation value of summer time (DST) (both leap second and summer time (DST) Since the offset value is used, both the leap second and the daylight saving time (DST) are corrected.
- offset value between the reference time for example, PTP
- DST variation value of summer time
- DST both leap second and summer time (DST) Since the offset value is used, both the leap second and the daylight saving time (DST) are corrected.
- the clock synchronization unit 251 supplies the local time as the internal time to the presentation synchronization unit 252 and the time / ESG display processing unit 253.
- the component time zone correction unit 254 receives (the data of) a component whose time zone of the timeline is a time zone other than UTC, component time zone information and time zone information included in the time information metadata.
- the component time zone correction unit 254 performs component time zone correction based on the component time zone information and the time zone information, and converts the time zone (other than UTC) of the component to the local time. Then, the component time zone correction unit 254 supplies (the data of) the component after the time zone correction to the presentation synchronization unit 252.
- the presentation synchronization unit 252 receives the internal time (local time) from the clock synchronization unit 251, (the data of) the component from the component time zone correction unit 254, and the discontinuous time information included in the time information metadata. Ru.
- the presentation synchronization unit 252 realizes presentation synchronization by processing (components of) components in which the time zone of the timeline is the local time using the internal time (local time) from the clock synchronization unit 251. Then, the presentation synchronization unit 252 outputs (data of) the presentation synchronized video and audio components. In addition, when performing presentation synchronization, the presentation synchronization unit 252 can perform processing using discontinuous time information (for example, information on leap seconds) as necessary.
- discontinuous time information for example, information on leap seconds
- the ESG time zone correction unit 255 receives ESG (data) whose time zone is a time zone other than UTC, and ESG time zone information and time zone information included in time information metadata.
- the ESG time zone correction unit 255 performs ESG time zone correction based on the ESG time zone information and time zone information, and converts an ESG time zone (other than UTC) into local time. Then, the ESG time zone correction unit 255 supplies (the data of) the ESG after time zone correction to the time / ESG display processing unit 253.
- the time / ESG display processing unit 253 includes the internal time (local time) from the clock synchronization unit 251, (the data of) the ESG from the ESG time zone correction unit 255, and the discontinuous time information included in the time information metadata. Is input.
- the time / ESG display processing unit 253 processes the internal time (local time) from the clock synchronization unit 251 to display the time corresponding to the local time.
- the time / ESG display processing unit 253 causes the ESG corresponding to the local time to be displayed by processing (the data of) the ESG in which the time zone of the timeline is the local time.
- the time / ESG display processing unit 253 can perform processing using discontinuous time information (for example, information regarding a leap second) as necessary.
- transmitting apparatus 10 transmits time information metadata including information for performing time information processing corresponding to the local time mode B together with the local time as time information. Then, the receiving device 20 can perform time information processing according to the local time mode B using the time information metadata.
- FIG. 18 is a diagram showing an outline of processing on the transmission side and the reception side corresponding to the local time mode C.
- the time information conversion unit 151 converts the GPS time into the local time by correcting the difference between the GPS time and the local time using the offset information. Thereby, local time as time information is obtained.
- time information metadata is generated.
- the time information metadata includes a time information mode.
- the local time mode is set as the time information mode.
- the transmitting apparatus 10 transmits a local time as time information and a broadcast stream including time information metadata to the receiving apparatus 20 via the transmission path 30. Also, in the transmitting device 10, video and audio components and (the data of) ESG are processed and included in the broadcast stream. However, in the case of the local time mode B, the time zone of the component and the timeline of the ESG is taken as the local time.
- the broadcast stream transmitted from the transmitting device 10 via the transmission path 30 is received.
- the broadcast stream includes local time and time information metadata as time information, video and audio components, ESG (data), and the like.
- the receiving device 20 operates in the local time mode C (local time mode) according to the time information mode included in the time information metadata.
- the clock synchronization unit 251 performs clock synchronization using the local time as time information. Further, the clock synchronization unit 251 supplies the local time as the internal time to the presentation synchronization unit 252 and the time / ESG display processing unit 253.
- the offset value is made unnecessary in clock synchronization in the clock synchronization unit 251.
- the presentation synchronization unit 252 receives an internal time (local time) from the clock synchronization unit 251 and (a component of) a component whose time zone is the local time.
- the presentation synchronization unit 252 realizes presentation synchronization by processing (components of) components in which the time zone of the timeline is the local time using the internal time (local time) from the clock synchronization unit 251. Then, the presentation synchronization unit 252 outputs (data of) the presentation synchronized video and audio components.
- the internal time (local time) from the clock synchronization unit 251 and (the data of) ESG whose time zone is the local time are input to the time / ESG display processing unit 253.
- the time / ESG display processing unit 253 processes the internal time (local time) from the clock synchronization unit 251 to display the time corresponding to the local time.
- the time / ESG display processing unit 253 causes the ESG corresponding to the local time to be displayed by processing (the data of) the ESG in which the time zone of the timeline is the local time.
- the transmitting device 10 transmits time information metadata including information for performing time information processing corresponding to the local time mode C together with the local time as time information.
- the reception device 20 can perform time information processing according to the local time mode C using the time information metadata.
- the case where the offset value becomes unnecessary by clock synchronization in the clock synchronization unit 251 will be described by adopting the clock synchronization method in which the physical layer clock and the system clock are synchronized as previously proposed.
- offset information for example, an offset value between a reference time (for example, PTP) and a local time
- the clock synchronization unit 251 performs offset value correction using the offset value between the reference time (for example, PTP) and the local time. It is possible to correct the leap second and summer time (DST).
- FIG. 19 is a diagram showing an example of adjusting the time by the leap second correction performed by the receiving device 20 using the time information metadata.
- the direction of time is the direction from left to right in the figure, and the time series of time information before leap second correction and after leap second correction are shown in A of FIG. 19 and B of FIG. There is.
- the numbers in the continuous squares represent the time according to the time information such as UTC, and the numbers in the hexagon described below the continuous squares. Represents the value (in seconds) of the leap second offset at that time.
- the leap second offset value is obtained from offset information or discontinuous time information included in time information metadata.
- the insertion time of the leap second is specified by the start time and the end time of the leap second included in the time information metadata (discontinuous time information).
- +25 seconds is set as the offset value of the leap second. This means that 25 leap seconds have been inserted by this time. From the time when the previous leap second was inserted or deleted, +25 seconds is set as the leap second offset value from 6/30 23:59:59 immediately before the leap second is inserted.
- the time series of B of FIG. 19 represents a time series after the leap second correction using the leap second offset value corresponding to the time series of A of FIG.
- the offset value of leap second is +25 seconds at 6/30 23:50:00
- the time after the leap second correction is the time series of B of FIG. 19.
- it becomes 23:50:25 of 6/30 which added 25 seconds.
- the time after the leap second correction also corresponds to the offset value of the leap second. This is the time when 25 seconds have been added.
- +25 seconds is set as an offset value of the leap second to 23:59:59 just before that, and the leap second correction is set.
- the later time will be 7/1 00:00:24.
- +26 seconds is set as the offset value of the leap second at 23:59:59 immediately after the leap second is inserted, and the time after the leap second correction is 00:00:25 of 7/1. Become.
- the leap second offset value is added so that even before and after the insertion of the leap second, 00:00:00. It can be converted to continuous time, such as: 25, 00:00: 26,. Therefore, for example, even when it is time information that needs to be subjected to leap second correction, such as UTC, the time after leap second correction can be treated as continuous time (time information), so the time information Can be used for presentation synchronization.
- FIG. 20 is a diagram showing an example of adjusting the time by the leap second correction using the internal counter, which is performed in the receiving device 20.
- the direction of time is the direction from left to right in the figure, and the time series of time information before leap second correction and after leap second correction are shown in A of FIG. 20 and B of FIG. There is.
- the numbers in the continuous rectangles represent the time according to the time information such as UTC, and the leap second flag (Leap_second_flag) below the continuous rectangles.
- a timing chart is depicted.
- Leap_second_flag [0] represents the occurrence time of leap second, and for example, adjustment of leap second by setting a bit from one day (24 hours before) when insertion of leap second (+1 second) is performed. It can be notified that processing is to be performed. Also, Leap_second_flag [1] represents insertion or deletion of a leap second, and in this example, insertion of a leap second (+1 second) is performed, so "0" is set as Leap_second_flag [1]. .
- Leap_second_flag [ 0] switches from “0" to "1".
- the receiving device 20 is notified that the leap second adjustment process will be performed within 24 hours. Then, this state continues until the time according to the time information such as UTC becomes 23:59:59 on 6/30, and when it becomes 23:59:59 on 6/30, according to the time information At the same time, Leap_second_flag [0] switches from "1” to "0” according to the insertion of a leap second.
- a continuous hexagon below the timing chart of the leap second flag (Leap_second_flag) represents a timing chart of the internal counter 222A (FIG. 3) of (the time information processing unit 222 of) the receiving device 20.
- the numbers in the hexagon represent the values held in the internal counter 222A. That is, in the internal counter 222A of the receiving apparatus 20, the initial value is set to "+0", but when Leap_second_flag [0] is switched from "1" to "0", it is incremented by one, and thereafter , "+1" is held.
- the time series of B in FIG. 20 represents a time series after the leap second correction using the value of the internal counter 222A of the receiving device 20 corresponding to the time series of A of FIG.
- the time after the leap second correction is the time of B of FIG. As represented by the series, it remains at 23:50:00.
- the value of the internal counter 222A also becomes +0 seconds similarly from 6/30 23:50:01 to 6/30 23:59:59 just before the leap second is inserted.
- the time after the second correction is the same as the time before the correction.
- +0 seconds is set as the value of the internal counter 222A at 23:59:59 immediately before that, which is a leap second.
- the corrected time remains at 23:59:59 on 6/30.
- +1: 2 is set as the value of the internal counter 222A at 23:59:59 immediately after the leap second is inserted, and the time after the leap second correction is 7/1 00:00:00. It becomes.
- the value of the internal counter 222A is added so that even before and after insertion of a leap second, ..., 23 It can be converted to continuous time, such as 59:59, 00: 00:00. Therefore, for example, even when it is time information that needs to be subjected to leap second correction, such as UTC, the time after leap second correction can be treated as continuous time (time information), so the time information Can be used for presentation synchronization.
- the value of the internal counter 222A is counted up from +1 second to +2 seconds before and after the insertion according to the leap second flag. Ru.
- the value of the internal counter 222A is made equivalent to the above-mentioned offset value of the leap second. Therefore, in the receiving device 20, by holding the value corresponding to the leap second flag in the internal counter 222A, it becomes unnecessary to include the leap second offset value in the time information metadata.
- the leap second is inserted.
- the leap second may be deleted (-1 second).
- the value of the internal counter 222A of the receiving device 20 is , Will be counted down.
- “1” is set as Leap_second_flag [1].
- FIG. 21 is a diagram illustrating an example of adjusting the time by DST correction using time information metadata, which is performed by the receiving device 20.
- FIG. 21 the direction of time is from the left to the right in the figure, and the time series before DST correction and the internal time after DST correction are respectively shown in A of FIG. 21 and B of FIG.
- the numbers in the continuous rectangles represent internal times such as the local time, and the numbers in the hexagon described below the continuous rectangles are the internals. It represents the DST offset value (unit: hour, minute, second) at time. However, the DST offset value is obtained from offset information or discontinuous time information included in time information metadata. Also, the start time of the daylight saving time (DST) is specified by the date or time when the time becomes discontinuous next, which is included in the time information metadata (discontinuous time information).
- the internal time switches from 1:59:59 to 2:00:00 on 3/9
- the internal time becomes the start time of daylight saving time (DST)
- the DST offset value is adjusted from 5:00:00 to 4:00:00. After 3:00:00 on the following 3/9, 4:00:00 after adjustment will be set as the DST offset value.
- the time series of B of FIG. 21 represents the time series after DST correction using the DST offset value corresponding to the time series of A of FIG.
- the time after DST correction is the time series of B in FIG. 21.
- it becomes 6:50:00 of 3/9 to which 5:00:00 was added.
- the time after DST correction also depends on the DST offset value. , 5:00: 00 will be added time.
- the DST offset value becomes the start time of the daylight saving time (DST), Since the time is adjusted from 5:00:00 to 4:00:00, the time after DST correction is 4:00:00 according to the DST offset value in the time series of B in FIG. 21 thereafter. It will be the added time.
- the DST offset value is immediately before 1:59:59.
- the time after DST correction becomes 6:59:59 of 3/9.
- 4:00:00 is set as the DST offset value at 3:00:00 immediately after switching to daylight saving time (DST), and the time after DST correction is 3:00 on 7:00 It becomes.
- the DST offset value is added so that even before and after the start of summer time (DST), ..., 6:59:59, It can be converted to continuous time, such as 7:00:00. Therefore, for example, even in a region where summer time (DST) is implemented, as in Western countries, the time after DST correction can be treated as continuous time (internal time), so the internal time Can be used for presentation synchronization.
- anchor information that is, availabilityStartTime attribute of the MPD
- component (media) is synchronized with time information such as UTC. Therefore, in the time series of the media timeline of B of FIG. 22, the leap seconds are inserted (+1 second) at the same timing as the time series of the internal time of FIG. The time series can be followed correctly.
- the local time is used in the time series of the media timeline in B of FIG. 22, when the time zones are different, component time zone information or time zone information included in the time information metadata is used. And correct the time zone of the component.
- FIG. 23 the time series of the internal time at the start of summer time (DST) and the time series of the media timeline at the start of summer time (DST) are shown in A of FIG. 23 and B of FIG. ing.
- anchor information that is, availabilityStartTime attribute of the MPD
- component (media) is synchronized with time information such as local time. Therefore, in the time series of the media timeline of B of FIG. 23, the daylight saving time (DST) is started at the same timing as the time series of the internal time of A of FIG. Can be followed correctly.
- B of FIG. 23 showed the example of the time series of a media timeline (timeline of a component), also about the timeline of ESG, since it is processed by the transmitter 10 of a broadcasting station, the component mentioned above ( By the same processing as the media), the ESG can be displayed synchronously in the receiving device 20.
- FIG. 24 is a diagram illustrating an example of syntax of time information metadata.
- the 3-bit time_mode is a time information mode defined for each format (time format) of time information. For example, when “0" is set as this time_mode, the time information mode is set to the UTC mode. In addition, for example, when “1" is set as time_mode, the PTP mode is set, and when "2" is set as time_mode, the local time mode is set.
- 5-bit timezone is time zone information.
- This time zone information includes information (. +-. 12 with respect to UTC) representing the standard time of the region as a difference from UTC.
- the 16-bit timeOffset is offset information.
- the offset information includes an offset value between the reference time and the discontinuous time.
- the reference time for example, a time defined by a standard, such as information of a time defined by PTP, is used.
- the time information mode when the time information mode is the UTC mode, an integrated value of leap seconds is set as an offset value between the reference time (for example, PTP) and the UTC.
- a value (PTP-UTC offset value) for converting PTP to UTC as offset information between reference time (for example PTP) and discontinuous time (for example UTC) Is set.
- time information mode is the local time
- a value obtained by adding the integrated value of leap seconds and the variation value of summer time (DST) as an offset value between the reference time (for example, PTP) and the local time And daylight savings time (DST) are set.
- 8-bit nextTimeJumpday, 8-bit nextTimeJumphour, 16-bit timeJumpValue, and 3-bit timeJumpType are discontinuous time information.
- NextTimeJumpday is set to the date when the time becomes discontinuous next.
- NextTimeJumphour is set to the time when the time becomes discontinuous next.
- timeJumpValue the amount of change in time to be discontinuous next is set.
- timeJumpType the type of time when the time becomes discontinuous next is set. For example, when “0” is set as the timeJumpType, the type of time at which the time becomes discontinuous next is a leap second, and the discontinuous time information includes information on the leap second. Also, for example, when “1” is set as timeJumpType, the type of time when the time becomes discontinuous next is summer time (DST), and the information on summer time (DST) is in the discontinuous time information. included.
- 5-bit media_timezone is component time zone information.
- 5-bit esg_timezone is ESG time zone information. Note that 3-bit reserved is an undefined area.
- time information metadata in FIG. 24 is an example, and for example, new information may be added to this time information metadata, or some information may be deleted.
- the time information metadata may be used instead of discontinuous time information or offset information.
- a leap second flag may be added.
- Leap_second_flag [0] which is a flag indicating a time when a leap second occurs
- Leap_second_flag [1] which is a flag indicating insertion or deletion of a leap second
- FIG. 24 although it is a bit string notation (Mnemonic), “uimsbf” is an abbreviation of unsigned integer most significant bit first, and means that it is treated as an integer by bit operation. Also, “bslbf” is an abbreviation of bit string left bit first, which means that it is treated as a bit string. Furthermore, “tcimsbf” is an abbreviation of two's complement integer, most significant first.
- FIG. 25 is a diagram showing an outline of a transmission method of time information metadata.
- the time information metadata can be transmitted, for example, using any of the following six transmission methods (A) to (F).
- A Descriptor transmission system
- B ALP extended header transmission system
- C L2 signaling header transmission system
- D L2 signaling transmission system
- E BBP extended header transmission system
- F L1 signaling transmission system
- IP Internet Protocol
- UDP User Datagram Protocol
- TS Transport Stream
- ROUTE is a protocol that is an extension of File Delivery over Unidirectional Transport (FLUTE), which is a protocol suitable for multicast transfer of binary files in one direction.
- FLUTE File Delivery over Unidirectional Transport
- This ROUTE session can be used to transmit video and audio components, signaling and so on.
- LLS signaling is signaling acquired prior to SLS signaling, and SLS signaling is acquired according to information included in LLS signaling.
- LLS signaling for example, metadata such as SLT (Service List Table), EAT (Emergency Alerting Table), RRT (Region Rating Table) and the like are included.
- the SLT metadata includes information indicating the configuration of streams and services in the broadcast network, such as information necessary for channel selection of services (channel selection information).
- the EAT metadata includes information on emergency information, which is information that needs to be notified urgently.
- RRT metadata includes information on ratings.
- ESG Electronic Service Guide
- ESG Electronic Service Guide
- SLS signaling for each service, for example, meta such as USBD (User Service Bundle Description) or USD (User Service Description), S-TSID (Service-based Transport Session Instance Description), MPD (Media Presentation Description), etc. Contains data.
- USBD User Service Bundle Description
- USD User Service Description
- S-TSID Service-based Transport Session Instance Description
- MPD Media Presentation Description
- the USBD or USD metadata includes information such as the acquisition source of other metadata.
- the S-TSID metadata is an extension of LSID (LCT Session Instance Description) for ATSC 3.0, and is control information of the ROUTE protocol.
- MPD metadata is control information for managing playback of a stream of components.
- the metadata such as USBD, USD, S-TSID, and MPD is described in a markup language such as XML (Extensible Markup Language).
- MPD metadata conforms to the MPEG-DASH (Dynamic Adaptive Streaming over HTTP) standard.
- layer 1 which is a physical layer
- layer 2 which is an upper layer of layer 1
- upper layer of layer 2 A certain layer 3 (L3) has a hierarchical structure.
- IP packet is composed of an IP header (IP Header) and a payload (Payload).
- IP Header IP header
- Payload data of components such as video and audio and data of signaling such as SLS signaling are arranged.
- time information metadata as a descriptor is placed in the payload of the IP packet.
- an ALP packet (ALP (ATSC Link-layer Protocol) Packet) as a transmission packet is transmitted.
- An ALP packet is composed of an ALP header (ALP Header) and a payload (Payload).
- ALP Header ALP header
- Payload a payload
- IP packets or tuning information are placed and encapsulated.
- time information metadata is arranged in the extension header of the ALP packet.
- time information metadata is arranged in the L2 signaling header arranged in the payload of the ALP packet.
- time information metadata is arranged in the payload of the ALP packet.
- BBP Baseband Packet
- the BBP is composed of a BBP header (Baseband Packet Header) and a payload (Payload).
- BBP payload one or more ALP packets are placed and encapsulated.
- time information metadata is arranged in the extended header of this BBP.
- layer 1 data (Data) obtained by scrambling one or more BBPs is mapped to an FEC frame (FEC frame), and a parity for error correction of the physical layer is added.
- Data data obtained by scrambling one or more BBPs is mapped to an FEC frame (FEC frame), and a parity for error correction of the physical layer is added.
- the physical layer frame (Physical Frame) of layer 1 (L1) is composed of a bootstrap (BS: Bootstrap), a preamble (Preamble), and a data section (Data). Then, in the data portion of the physical layer frame, after performing bit interleaving on a plurality of FEC frames, mapping processing is performed, and further interleaving in the time direction and frequency direction is performed (modulation (modulation) Data obtained by performing the processing is mapped.
- BS Bootstrap
- Preamble preamble
- Data data section
- time information metadata as L1 signaling is arranged in the bootstrap or preamble of the physical layer frame.
- the frame length of the physical layer frame is, for example, 100 to 200 ms.
- time information metadata as a descriptor is transmitted as an IP packet (IP packet) including a UDP packet, as in LLS signaling, for example.
- the time information metadata (descriptor) in FIG. 27 includes 8 bits time_info_id, 3 bits time_mode, 5 bits timezone, 16 bits timeOffset, 8 bits nextTimeJumpday, 8 bits nextTimeJumphour, 16 bits timeJumpValue, 3 It includes bits timeJumpType, 5 bits media_timezone, and 5 bits esg_timezone.
- time_info_id an ID for indicating the type of the descriptor is set.
- time_info_id since it is the same as the information contained in the time information metadata shown in FIG. 24, the description is abbreviate
- a descriptor transmission method is used, and a descriptor including time information metadata is transmitted as an IP packet, thereby a receiving apparatus In 20 (FIG. 1), since time information metadata (descriptor) included in an IP packet is extracted, time information processing according to the time information mode can be performed based on the time information metadata. It becomes.
- ALP Extended Header Transmission Method Next, the ALP extended header transmission method will be described with reference to FIGS. 28 and 29.
- time information metadata is transmitted using the ALP extended header.
- FIG. 28 shows the configuration of an ALP packet.
- 3-bit type information (Type) is set at the head of the ALP header. This type information is set as information on the type of data to be placed in the payload of the ALP packet.
- 1-bit packet configuration information (PC: Packet Configuration) is arranged next to the type information.
- PC Packet Configuration
- a single packet mode (Single packet mode) is set according to the 1-bit header mode (HM: Header Mode) to be arranged next to the ALP header.
- HM Header Mode
- 11-bit length information (Length)
- an extension header (Additional header) are arranged.
- the payload is placed following the ALP header.
- an ALP packet in which the extension header is not arranged is referred to as a normal packet, while an ALP packet in which the extension header is arranged is referred to as a long packet.
- a segmentation mode (Segmentation mode) or a concatenation mode (Segmentation / Concatenation) to be arranged next to that is selected.
- Concatenation mode 11-bit length information (Length) and an extension header (Additional header) are placed in the ALP header.
- time information metadata is arranged in an extension header (Additional header) surrounded by a frame A in the drawing. That is, in the case of single packet mode (long packet) and segmentation mode, when "1" is set as an optional extension header flag (OHF: Optional Header Extension Flag) in the extension header, an optional header (Optional Header) Is placed. In addition, in the case of the concatenation mode, in the extension header, when “1” is set as the substream identification flag (SIF: Sub-stream Identifier Flag), an optional header is arranged.
- OPF Optional Header Extension Flag
- SIF Sub-stream Identifier Flag
- the structure shown in FIG. 29 can be arranged in this optional header.
- various types of information are arranged for each extension header index information (Additional header Index).
- time_info time information metadata
- the time information metadata shown in FIG. 24 can be arranged here.
- time information metadata is arranged and transmitted in the extension header of the ALP packet.
- time information processing according to the time information mode is performed based on the time information metadata. It becomes possible.
- FIG. 30 shows the configuration of an LLS (Link Layer Signaling) packet as a layer 2 ALP packet.
- LLS Link Layer Signaling
- LLS signaling is signaling obtained prior to SLS signaling.
- This LLS signaling includes, for example, metadata such as SLT, EAT, and RRT.
- LLS Packet when LLS signaling is placed in the payload of an ALP packet, it can be said that the ALP packet is an LLS packet (LLS Packet).
- the LLS packet is composed of an LLS header (LLS Header) and a payload in which LLS signaling (LLS) is arranged. Also, in this case, one or more LLS packets are placed in the BBP payload and encapsulated.
- LLS Index LLS index information
- Object Version object version information
- compression information In LLS index information, compression information (Compression Scheme), type information (Fragment Type), and extension type information (Type Extension) are arranged.
- compression information information indicating the presence or absence of compression of the target LLS signaling is set. For example, when “0000” is set, it indicates that the file is uncompressed, and when "0001" is set, it indicates that the file is compressed in the zip format.
- type information (Fragment Type) information on the type of LLS signaling is set. For example, “000000” can be set for SLT, "000001" for EAT, and "000010" for RRT.
- extension type information extension parameters are set for each type. Also, in the object version information, information regarding the version of the object is placed.
- time information metadata can be included in addition to LLS index information and object version information, as shown in FIG. 24 can be arranged here.
- the time information metadata is arranged and transmitted in the L2 signaling header,
- time information processing according to the time information mode may be performed based on the time information metadata. It becomes possible.
- the time information metadata (L2 signaling) of FIG. 32 includes 8 bits time_info_id, 3 bits time_mode, 5 bits timezone, 16 bits timeOffset, 8 bits nextTimeJumpday, 8 bits nextTimeJumphour, 16 bits timeJumpValue, 3 It includes bits timeJumpType, 5 bits media_timezone, and 5 bits esg_timezone.
- time information metadata of FIG. 32 is the same as the information included in the time information metadata illustrated in FIG. 24 or FIG. 27, and thus the description thereof is omitted here.
- time information metadata of FIG. 32 may be placed in the payload of the ALP packet as L2 signaling, or L2 signaling placed in the payload of the ALP packet (for example, LLS signaling)
- L2 signaling placed in the payload of the ALP packet (for example, LLS signaling)
- LLS signaling for example, LLS signaling
- the L2 signaling transmission method is used as a transmission format for transmitting time information metadata, and reception is performed by causing time information metadata to be placed in the body of L2 signaling and transmitted.
- the device 20 FIG. 1
- time information metadata arranged in the main body of L2 signaling is extracted, it is possible to perform time information processing according to the time information mode based on the time information metadata. It becomes.
- FIG. 33 shows the configuration of a BBP (Baseband Packet).
- BBP is composed of a BBP header and a payload (Payload).
- Payload In the BBP header, in addition to a 1-byte or 2-byte header (Header), an optional field (Optional Field) and an extension field (Extension Field) can be arranged.
- Optional Field In addition to a 1-byte or 2-byte header (Header), an optional field (Optional Field) and an extension field (Extension Field) can be arranged.
- Extension Field Extension Field
- the pointer information is information for indicating the position of the ALP packet arranged in the payload of BBP. For example, when data of an ALP packet arranged last in a certain BBP is arranged across the next BBP, the position information of the ALP packet arranged at the head of the next BBP is set as pointer information. Can.
- the optional flag is information indicating whether or not to extend the header by arranging an optional field and an extension field.
- the optional flag when the optional field and the extension field are not expanded, the optional flag is set to "00". In addition, when only expanding the optional field, the optional flag is set to "01" or "10". When “01" is set as an optional flag, padding of 1 byte (8 bits) is performed on the optional field. When “10” is set as an optional flag, 2-byte (16 bits) padding is performed on the optional field.
- extension type information (EXT_TYPE)
- LSB extension length information
- extension length information when extension length information is arranged and only stuffing bytes are arranged, "000" is set as the expansion type information. Also, when an input stream synchronizer (ISSY) is placed in the extension field without placing the extension length information, the extension type information is set to “001”. Furthermore, when the extension length information is placed and the stuffing byte is placed in the extension field together with ISSY, the extension type information is set to "010".
- ISSY input stream synchronizer
- extension type information when extension length information is placed and L1 signaling is placed in the extension field, “011” is set as the extension type information. In this case, whether or not the stuffing byte is arranged is optional. In FIG. 35, the extended type information of “100” to “111” is undefined (Reserved).
- time information metadata is disposed as L1 signaling of this extension field (BBP extension header). That is, when the BBP extension header transmission method is used, "11" is set as the optional flag (OPTI), the optional field and the extension field are expanded, and further, as the optional field extension type information (EXT_TYPE) 011 "is set, and L1 signaling including time information metadata is placed in the extension field.
- OPTI optional flag
- EXT_TYPE optional field extension type information
- the structure shown in FIG. 36 can be arranged.
- various types of information are arranged for each extension header index information (BBP Extension Header Index).
- BBP Extension Header Index When "000000" is set as the extension header index information, it can be defined that time information metadata (time_info) is placed in the extension field.
- time_info time information metadata
- the time information metadata shown in FIG. 24 can be arranged here.
- the time information metadata is transmitted by being arranged in the BBP extended header, In the device 20 (FIG. 1), since time information metadata arranged in the BBP extension header is extracted, it is possible to perform time information processing according to the time information mode based on the time information metadata. Become.
- the physical layer frame is composed of a bootstrap (BS: Bootstrap), a preamble (Preamble), and a data part (Data).
- BS Bootstrap
- Preamble preamble
- Data data part
- time information metadata as L1 signaling is arranged in a bootstrap or a preamble surrounded by a frame A in the drawing.
- the time information metadata shown in FIG. 24 can be arranged here.
- time information metadata of FIG. 24 may be placed in the bootstrap or preamble of the physical layer frame as L1 signaling, or L1 signaling placed in the bootstrap or preamble.
- the time information metadata of FIG. 24 may be included in (for example, L1-post signaling).
- time information metadata is arranged and transmitted in the body of L1 signaling, so that reception is performed.
- time information metadata arranged in the main body of L1 signaling is extracted, time information processing according to the time information mode can be performed based on the time information metadata. It becomes.
- step S101 data processing is performed by the component processing unit 111 to the packet processing unit 114.
- the component processing unit 111 processes component data.
- the ESG processing unit 112 processes ESG data.
- processing on signaling data by the signaling processing unit 121 and processing on time information or time information metadata by the time information processing unit 122 Is done.
- the packet processing unit 114 stores the processed data in the packet.
- step S102 the modulation processing unit 115 performs modulation processing on the data processed in step S101.
- step S103 the transmission unit 116 transmits the signal obtained in the process of step S102 as a digital broadcast signal via the antenna 131.
- step S201 the reception unit 211 receives the digital broadcast signal transmitted from the transmission device 10 via the antenna 231.
- step S202 the demodulation processing unit 212 performs demodulation processing on the signal processed in step S201.
- step S203 the processing unit 213 to the ESG processing unit 216 process the data processed in step S202.
- the packet processor 214 processes the packet. Further, in the processing unit 213, processing on signaling data by the signaling processing unit 221 and processing on time information or time information metadata by the time information processing unit 222 (for example, processing on the receiving side shown in FIGS. 12 to 18) ) Is done. Further, the component processing unit 215 processes component data, and the ESG processing unit 216 processes ESG data.
- the ATSC in particular, ATSC 3.0
- ATSC 3.0 which is a system adopted in the United States and the like
- DVB Digital Video Broadcasting
- the ATSC 3.0 in which the IP transmission method is adopted has been described as an example, but the present invention is not limited to the IP transmission method, and is applied to other methods such as the MPEG2-TS (Transport Stream) method. You may do so.
- satellite broadcasting such as BS (Broadcasting Satellite) and CS (Communications Satellite)
- CATV Cable television
- the names of the above-mentioned signaling and packets are merely an example, and other names may be used. However, the difference between these names is a formal difference, and the substantial contents such as target signaling and packets are not different.
- BBP Baseband Packet
- BBS Baseband Stream
- ESG Electronic Service Guide
- EPG Electronic Program Guide
- the above-described content may include, in addition to video and music, any content such as an electronic book, game, advertisement, and the like.
- time information is mainly described with information on time defined by UTC, PTP, and local time, but not limited thereto, for example, NTP (Network Time Protocol) or 3GPP (Third Generation Partnership Project) It is possible to use information of any time such as information of time specified in the above, information of time included in GPS (Global Positioning System) information, and information of time of other uniquely determined format.
- NTP Network Time Protocol
- 3GPP Third Generation Partnership Project
- the present technology is a predetermined standard that is defined on the assumption that a transmission line other than a broadcast network, ie, a communication line (communication network) such as the Internet or a telephone network, is used as a transmission line.
- a communication line such as the Internet or a telephone network may be used as the transmission line 30 of the transmission system 1 (FIG. 1), and the transmission device 10 may be a server provided on the Internet.
- the transmitting device 10 performs processing in response to a request from the receiving device 20.
- the receiving device 20 processes data transmitted from the transmitting device 10 (server) via the transmission path 30 (communication line).
- FIG. 40 is a diagram showing an example of a hardware configuration of a computer that executes the series of processes described above according to a program.
- a central processing unit (CPU) 901, a read only memory (ROM) 902, and a random access memory (RAM) 903 are mutually connected by a bus 904. Further, an input / output interface 905 is connected to the bus 904. An input unit 906, an output unit 907, a recording unit 908, a communication unit 909, and a drive 910 are connected to the input / output interface 905.
- the input unit 906 includes a keyboard, a mouse, a microphone, and the like.
- the output unit 907 includes a display, a speaker, and the like.
- the recording unit 908 includes a hard disk, a non-volatile memory, and the like.
- the communication unit 909 is formed of a network interface or the like.
- the drive 910 drives removable media 911 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory.
- the CPU 901 loads the program stored in the ROM 902 or the recording unit 908 into the RAM 903 via the input / output interface 905 and the bus 904 and executes the program. A series of processing is performed.
- the program executed by the computer 900 can be provided by being recorded on, for example, a removable medium 911 as a package medium or the like. Also, the program can be provided via a wired or wireless transmission medium such as a local area network, the Internet, or digital satellite broadcasting.
- the program can be installed in the recording unit 908 via the input / output interface 905 by attaching the removable media 911 to the drive 910.
- the program can be received by the communication unit 909 via a wired or wireless transmission medium and installed in the recording unit 908.
- the program can be installed in advance in the ROM 902 or the recording unit 908.
- the processing performed by the computer according to the program does not necessarily have to be performed chronologically in the order described as the flowchart. That is, the processing performed by the computer according to the program includes processing executed in parallel or separately (for example, parallel processing or processing by an object). Further, the program may be processed by one computer (processor) or may be distributed and processed by a plurality of computers.
- the present technology can have the following configurations.
- a receiving unit that receives metadata including information for performing a process related to time information according to a mode corresponding to a plurality of time information; A processing unit that performs processing related to the time information based on the metadata.
- the metadata includes information for correcting time information which becomes discontinuous according to the mode into continuous time information, The receiving device according to (1), wherein the processing unit corrects discontinuous time information to continuous time information based on the metadata.
- the metadata includes an offset value between a reference time serving as a reference and a discontinuous time which is discontinuous according to the mode.
- the metadata includes, according to the mode, a date and time when the time becomes discontinuous next, and a change amount of the time becoming discontinuous next.
- the discontinuous time information is leap second or Daylight Saving Time (DST), and The receiving device according to any one of (2) to (4), wherein the plurality of time information includes at least any of Coordinated Universal Time (UTC), Precision Time Protocol (PTP), or local time.
- UTC Coordinated Universal Time
- PTP Precision Time Protocol
- the offset value is an offset value between a reference time and UTC, and represents an integrated value of leap seconds
- the offset value is an offset value for converting PTP to UTC
- the offset value is an offset value between a reference time and a local time, and an integrated value of leap seconds and a variation value of summer time (DST) are added.
- DST variation value of summer time
- the metadata includes time zone information of a component or an electronic program guide, The receiving device according to any one of (1) to (8), wherein the processing unit corrects the time zone of the component or the electronic program guide according to the time zone information of the component or the electronic program guide.
- the broadcast stream including the metadata is a broadcast stream corresponding to an IP (Internet Protocol) transmission method
- the metadata may be a descriptor included in an IP packet including a UDP (User Datagram Protocol) packet, an extension header of a first transmission packet for transmitting the IP packet, and the first transmission packet.
- the receiver according to any one of (1) to (9), which is added to an extension header of a second transmission packet, signaling included in the first transmission packet, a header of the signaling, or a physical layer frame. .
- the receiving device Receiving metadata including information for performing processing related to time information according to a mode corresponding to a plurality of time information; A data processing method comprising the step of performing processing relating to the time information based on the metadata. (12) A generation unit that generates metadata including information for performing processing related to time information according to a mode corresponding to a plurality of time information; And a transmitting unit that transmits the metadata. (13) The transmission apparatus according to (12), wherein the metadata includes information for correcting time information that becomes discontinuous according to the mode into continuous time information. (14) The transmission apparatus according to (13), wherein the metadata includes an offset value between a reference time to be a reference and a discontinuous time to be discontinuous according to the mode.
- the discontinuous time information is leap second or summer time (DST), and The transmitting apparatus according to (13) or (14), wherein the plurality of time information includes at least either UTC, PTP, or local time.
- the offset value is an offset value between a reference time and UTC, and represents an integrated value of leap seconds
- the offset value is an offset value for converting PTP to UTC
- the offset value is an offset value between a reference time and a local time
- an integrated value of leap seconds and a variation value of summer time (DST) are added.
- the transmitter according to (15), which represents a value.
- the broadcast stream including the metadata is a broadcast stream corresponding to the IP transmission method
- the metadata includes a descriptor included in an IP packet including a UDP packet, an extension header of a first transmission packet for transmitting the IP packet, and a second transmission packet for transmitting the first transmission packet.
- the transmission apparatus according to any one of (12) to (16), which is added to an extension header of the above, signaling included in the first transmission packet, a header of the signaling, or a physical layer frame.
- the transmitting device Generating metadata including information for performing processing related to time information according to a mode corresponding to a plurality of time information; And transmitting the metadata.
- a receiver including metadata for performing processing related to time information according to a mode corresponding to a plurality of time information, the receiver receiving the metadata including a flag indicating insertion or deletion of a leap second; A counter that counts a value corresponding to the flag; A processing unit that corrects a leap second of the time information according to the value of the counter.
- the receiving device Metadata including information for performing processing on time information according to modes corresponding to a plurality of time information, the metadata including a flag indicating insertion or deletion of a leap second; A value corresponding to the flag is counted by the counter; Correcting a leap second of the time information according to the value of the counter.
- Reference Signs List 1 transmission system 10 transmitting apparatus, 20 receiving apparatus, 30 transmission path, 111 component processing unit, 112 ESG processing unit, 113 processing unit, 114 packet processing unit, 115 modulation processing unit, 116 transmitting unit, 121 signaling processing unit, 122 Time information processing unit, 151 time information conversion unit, 211 reception unit, 212 demodulation processing unit, 213 processing unit, 214 packet processing unit, 215 component processing unit, 216 ESG processing unit, 217 output unit, 221 signaling processing unit, 222 time Information processing unit, 222A internal counter, 251 clock synchronization unit, 252 presentation synchronization unit, 253 time / ESG display processing unit, 254 component time zone correction unit, 255 ESG time Over emissions correction unit, 900 computer, 901 CPU
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Abstract
Description
2.時刻情報モードに応じた時刻情報処理
(A)時刻情報モードの処理の内容
(B)うるう秒と夏時間(DST)の対応
(C)シンタックスの例
3.時刻情報メタデータの伝送方式
4.各装置で実行される処理の流れ
5.変形例
6.コンピュータの構成
図1は、本技術を適用した伝送システムの一実施の形態の構成を示す図である。なお、システムとは、複数の装置が論理的に集合したものをいう。
図2は、図1の送信装置10の構成例を示す図である。
図3は、図1の受信装置20の構成例を示す図である。
図6は、時刻情報モードに対応した処理の内容を示す図である。
UTCモードAは、時刻フォーマットがUTCであって、コンポーネントとESGのタイムラインのタイムゾーンが、UTCとなる場合の時刻情報モードである。このUTCモードAにおいては、受信装置20で、時刻情報としてのUTCを用いたクロック同期が行われる場合に、オフセット値補正が行われ、うるう秒が補正される。
UTCモードBは、時刻フォーマットがUTCであって、コンポーネントとESGのタイムラインのタイムゾーンが、UTC以外のタイムゾーンとなる場合の時刻情報モードである。このUTCモードBでは、UTCモードAと同様に、受信装置20で、クロック同期が行われる場合に、オフセット値補正が行われ、うるう秒が補正される。ただし、UTCモードBにおいても、UTCモードAと同様に、基準時刻(例えばPTP)とUTCとの差である、うるう秒の積算値が、オフセット値とされる。
PTPモードAは、時刻フォーマットがPTPであって、コンポーネントとESGのタイムラインのタイムゾーンが、UTCとなる場合の時刻情報モードである。このPTPモードAでは、時刻フォーマットにPTPを用いているため、受信装置20で、時刻情報としてのPTPを用いたクロック同期が行われる場合に、うるう秒の補正は不要とされる。
PTPモードBは、時刻フォーマットがPTPであって、コンポーネントとESGのタイムラインのタイムゾーンが、UTC以外のタイムゾーンとなる場合の時刻情報モードである。PTPモードBでは、PTPモードAと同様に、受信装置20で、時刻情報としてのPTPを用いたクロック同期が行われる場合に、うるう秒の補正は不要とされる。
ローカル時刻モードAは、時刻フォーマットがローカル時刻であって、コンポーネントとESGのタイムラインのタイムゾーンが、UTCとなる場合の時刻情報モードである。このローカル時刻モードAにおいては、受信装置20で、時刻情報としてのローカル時刻を用いたクロック同期が行われる場合に、オフセット補正が行われ、うるう秒と夏時間(DST)が補正される。
ローカル時刻モードBは、時刻フォーマットがローカル時刻であって、コンポーネントとESGのタイムラインのタイムゾーンが、UTC以外のタイムゾーンとなる場合の時刻情報モードである。このローカル時刻モードBでは、ローカル時刻モードAと同様に、受信装置20で、クロック同期が行われる場合に、オフセット補正が行われ、うるう秒補正が行われる。ただし、ローカル時刻モードBにおいても、ローカル時刻モードAと同様に、基準時刻(例えばPTP)とローカル時刻との差である、うるう秒の積算値と夏時間(DST)の変動値とを加算した値(うるう秒と夏時間(DST)の両方を含んだ値)が、オフセット値とされる。
図12は、UTCモードAに対応した送信側と受信側の処理の概要を示す図である。
図13は、UTCモードBに対応した送信側と受信側の処理の概要を示す図である。
図14は、PTPモードAに対応した送信側と受信側の処理の概要を示す図である。
図15は、PTPモードBに対応した送信側と受信側の処理の概要を示す図である。
図16は、ローカル時刻モードAに対応した送信側と受信側の処理の概要を示す図である。
図17は、ローカル時刻モードBに対応した送信側と受信側の処理の概要を示す図である。
図18は、ローカル時刻モードCに対応した送信側と受信側の処理の概要を示す図である。
図19は、受信装置20で行われる、時刻情報メタデータを用いたうるう秒補正による時刻の調整例を示す図である。
図20は、受信装置20で行われる、内部カウンタを用いたうるう秒補正による時刻の調整例を示す図である。
図21は、受信装置20で行われる、時刻情報メタデータを用いたDST補正による時刻の調整例を示す図である。
次に、図22及び図23を参照して、受信装置20の内部時刻と、MPD(のavailabilityStartTime属性)によるメディアタイムライン(コンポーネントのタイムライン)との関係について説明する。ここでは、まず、図22を参照して、うるう秒挿入時における、内部時刻とメディアタイムラインとの関係について説明し、その後、図23を参照して、夏時間(DST)の開始時における、内部時刻とメディアタイムラインとの関係について説明する。
図24は、時刻情報メタデータのシンタックスの例を示す図である。
図25は、時刻情報メタデータの伝送方式の概要を示す図である。
(B)ALP拡張ヘッダ伝送方式
(C)L2シグナリングヘッダ伝送方式
(D)L2シグナリング伝送方式
(E)BBP拡張ヘッダ伝送方式
(F)L1シグナリング伝送方式
まず、図27を参照して、記述子伝送方式について説明する。この記述子伝送方式においては、記述子としての時刻情報メタデータ(time_info)が、例えば、LLSシグナリングと同様に、UDPパケットを含むIPパケット(IPパケット)で伝送されるようにする。
次に、図28及び図29を参照して、ALP拡張ヘッダ伝送方式について説明する。このALP拡張ヘッダ伝送方式においては、ALP拡張ヘッダを利用して、時刻情報メタデータを伝送する。
次に、図30及び図31を参照して、L2シグナリングヘッダ伝送方式について説明する。このL2シグナリングヘッダ伝送方式においては、L2シグナリングのヘッダを利用して、時刻情報メタデータを伝送する。
次に、図32を参照して、L2シグナリング伝送方式について説明する。このL2シグナリング伝送方式においては、ALPパケットのペイロードに配置されるL2シグナリングの本体を利用して、時刻情報メタデータを伝送する。
次に、図33乃至図36を参照して、BBP拡張ヘッダ伝送方式について説明する。このBBP拡張ヘッダ伝送方式においては、BBP拡張ヘッダを利用して、時刻情報メタデータを伝送する。
最後に、図37を参照して、L1シグナリング伝送方式について説明する。このL1シグナリング伝送方式においては、L1シグナリングの本体を利用して、時刻情報メタデータを伝送する。
まず、図38のフローチャートを参照して、図1の送信装置10により実行される送信側データ処理の流れについて説明する。
次に、図39のフローチャートを参照して、図1の受信装置20により実行される受信側データ処理の流れについて説明する。
複数の時刻情報に対応したモードに応じた時刻情報に関する処理を行うための情報を含むメタデータを受信する受信部と、
前記メタデータに基づいて、前記時刻情報に関する処理を行う処理部と
を備える受信装置。
(2)
前記メタデータは、前記モードに応じて、不連続となる時刻情報を、連続した時刻情報に補正するための情報を含み、
前記処理部は、前記メタデータに基づいて、不連続となる時刻情報を、連続した時刻情報に補正する
(1)に記載の受信装置。
(3)
前記メタデータは、前記モードに応じて、基準となる基準時刻と、不連続となる不連続時刻とのオフセット値を含む
(2)に記載の受信装置。
(4)
前記メタデータは、前記モードに応じて、次に時刻が不連続になる日付及び時刻、並びに次に不連続になる時刻の変化量を含む
(3)に記載の受信装置。
(5)
前記不連続となる時刻情報は、うるう秒又は夏時間(DST:Daylight Saving Time)であって、
前記複数の時刻情報は、UTC(Coordinated Universal Time)、PTP(Precision Time Protocol)、又はローカル時刻のいずれかを少なくとも含む
(2)乃至(4)のいずれかに記載の受信装置。
(6)
前記モードが、UTCに対応したモードである場合、前記オフセット値は、基準時刻とUTCとのオフセット値であって、うるう秒の積算値を表しており、
前記処理部は、前記オフセット値に応じて、うるう秒を補正する
(5)に記載の受信装置。
(7)
前記モードが、PTPに対応したモードである場合、前記オフセット値は、PTPをUTCに変換するためのオフセット値であり、
前記処理部は、前記オフセット値に応じて、PTPをUTCに変換する
(5)又は(6)に記載の受信装置。
(8)
前記モードが、ローカル時刻に対応したモードである場合、前記オフセット値は、基準時刻とローカル時刻とのオフセット値であって、うるう秒の積算値と、夏時間(DST)の変動値とを加算した値を表しており、
前記処理部は、前記オフセット値に応じて、うるう秒と夏時間(DST)を補正する
(5)乃至(7)のいずれかに記載の受信装置。
(9)
前記メタデータは、コンポーネント又は電子番組表のタイムゾーン情報を含み、
前記処理部は、前記コンポーネント又は前記電子番組表のタイムゾーン情報に応じて、前記コンポーネント又は前記電子番組表のタイムゾーンを補正する
(1)乃至(8)のいずれかに記載の受信装置。
(10)
前記メタデータを含む放送ストリームは、IP(Internet Protocol)伝送方式に対応した放送ストリームであって、
前記メタデータは、UDP(User Datagram Protocol)パケットを含むIPパケットに含まれる記述子、前記IPパケットを伝送するための第1の伝送パケットの拡張ヘッダ、前記第1の伝送パケットを伝送するための第2の伝送パケットの拡張ヘッダ、前記第1の伝送パケットに含まれるシグナリング、前記シグナリングのヘッダ、又は、物理層フレームに付加されている
(1)乃至(9)のいずれかに記載の受信装置。
(11)
受信装置のデータ処理方法において、
前記受信装置が、
複数の時刻情報に対応したモードに応じた時刻情報に関する処理を行うための情報を含むメタデータを受信し、
前記メタデータに基づいて、前記時刻情報に関する処理を行う
ステップを含むデータ処理方法。
(12)
複数の時刻情報に対応したモードに応じた時刻情報に関する処理を行うための情報を含むメタデータを生成する生成部と、
前記メタデータを送信する送信部と
送信装置。
(13)
前記メタデータは、前記モードに応じて、不連続となる時刻情報を、連続した時刻情報に補正するための情報を含む
(12)に記載の送信装置。
(14)
前記メタデータは、前記モードに応じて、基準となる基準時刻と、不連続となる不連続時刻とのオフセット値を含む
(13)に記載の送信装置。
(15)
前記不連続となる時刻情報は、うるう秒又は夏時間(DST)であって、
前記複数の時刻情報は、UTC、PTP、又はローカル時刻のいずれかを少なくとも含む
(13)又は(14)に記載の送信装置。
(16)
前記モードが、UTCに対応したモードである場合、前記オフセット値は、基準時刻とUTCとのオフセット値であって、うるう秒の積算値を表し、
前記モードが、PTPに対応したモードである場合、前記オフセット値は、PTPをUTCに変換するためのオフセット値であり、
前記モードが、ローカル時刻に対応したモードである場合、前記オフセット値は、基準時刻とローカル時刻とのオフセット値であって、うるう秒の積算値と、夏時間(DST)の変動値とを加算した値を表している
(15)に記載の送信装置。
(17)
前記メタデータを含む放送ストリームは、IP伝送方式に対応した放送ストリームであって、
前記メタデータは、UDPパケットを含むIPパケットに含まれる記述子、前記IPパケットを伝送するための第1の伝送パケットの拡張ヘッダ、前記第1の伝送パケットを伝送するための第2の伝送パケットの拡張ヘッダ、前記第1の伝送パケットに含まれるシグナリング、前記シグナリングのヘッダ、又は、物理層フレームに付加されている
(12)乃至(16)のいずれかに記載の送信装置。
(18)
送信装置のデータ処理方法において、
前記送信装置が、
複数の時刻情報に対応したモードに応じた時刻情報に関する処理を行うための情報を含むメタデータを生成し、
前記メタデータを送信する
ステップを含むデータ処理方法。
(19)
複数の時刻情報に対応したモードに応じた時刻情報に関する処理を行うための情報を含むメタデータであって、うるう秒の挿入又は削除を示すフラグを含む前記メタデータを受信する受信部と、
前記フラグに応じた値をカウントするカウンタと、
前記カウンタの値に応じて、前記時刻情報のうるう秒を補正する処理部と
を備える受信装置。
(20)
カウンタを有する受信装置のデータ処理方法において、
前記受信装置が、
複数の時刻情報に対応したモードに応じた時刻情報に関する処理を行うための情報を含むメタデータであって、うるう秒の挿入又は削除を示すフラグを含む前記メタデータを受信し、
前記カウンタによって、前記フラグに応じた値をカウントし、
前記カウンタの値に応じて、前記時刻情報のうるう秒を補正する
ステップを含むデータ処理方法。
Claims (20)
- 複数の時刻情報に対応したモードに応じた時刻情報に関する処理を行うための情報を含むメタデータを受信する受信部と、
前記メタデータに基づいて、前記時刻情報に関する処理を行う処理部と
を備える受信装置。 - 前記メタデータは、前記モードに応じて、不連続となる時刻情報を、連続した時刻情報に補正するための情報を含み、
前記処理部は、前記メタデータに基づいて、不連続となる時刻情報を、連続した時刻情報に補正する
請求項1に記載の受信装置。 - 前記メタデータは、前記モードに応じて、基準となる基準時刻と、不連続となる不連続時刻とのオフセット値を含む
請求項2に記載の受信装置。 - 前記メタデータは、前記モードに応じて、次に時刻が不連続になる日付及び時刻、並びに次に不連続になる時刻の変化量を含む
請求項3に記載の受信装置。 - 前記不連続となる時刻情報は、うるう秒又は夏時間(DST:Daylight Saving Time)であって、
前記複数の時刻情報は、UTC(Coordinated Universal Time)、PTP(Precision Time Protocol)、又はローカル時刻のいずれかを少なくとも含む
請求項4に記載の受信装置。 - 前記モードが、UTCに対応したモードである場合、前記オフセット値は、基準時刻とUTCとのオフセット値であって、うるう秒の積算値を表しており、
前記処理部は、前記オフセット値に応じて、うるう秒を補正する
請求項5に記載の受信装置。 - 前記モードが、PTPに対応したモードである場合、前記オフセット値は、PTPをUTCに変換するためのオフセット値であり、
前記処理部は、前記オフセット値に応じて、PTPをUTCに変換する
請求項5に記載の受信装置。 - 前記モードが、ローカル時刻に対応したモードである場合、前記オフセット値は、基準時刻とローカル時刻とのオフセット値であって、うるう秒の積算値と、夏時間(DST)の変動値とを加算した値を表しており、
前記処理部は、前記オフセット値に応じて、うるう秒と夏時間(DST)を補正する
請求項5に記載の受信装置。 - 前記メタデータは、コンポーネント又は電子番組表のタイムゾーン情報を含み、
前記処理部は、前記コンポーネント又は前記電子番組表のタイムゾーン情報に応じて、前記コンポーネント又は前記電子番組表のタイムゾーンを補正する
請求項1に記載の受信装置。 - 前記メタデータを含む放送ストリームは、IP(Internet Protocol)伝送方式に対応した放送ストリームであって、
前記メタデータは、UDP(User Datagram Protocol)パケットを含むIPパケットに含まれる記述子、前記IPパケットを伝送するための第1の伝送パケットの拡張ヘッダ、前記第1の伝送パケットを伝送するための第2の伝送パケットの拡張ヘッダ、前記第1の伝送パケットに含まれるシグナリング、前記シグナリングのヘッダ、又は、物理層フレームに付加されている
請求項1に記載の受信装置。 - 受信装置のデータ処理方法において、
前記受信装置が、
複数の時刻情報に対応したモードに応じた時刻情報に関する処理を行うための情報を含むメタデータを受信し、
前記メタデータに基づいて、前記時刻情報に関する処理を行う
ステップを含むデータ処理方法。 - 複数の時刻情報に対応したモードに応じた時刻情報に関する処理を行うための情報を含むメタデータを生成する生成部と、
前記メタデータを送信する送信部と
送信装置。 - 前記メタデータは、前記モードに応じて、不連続となる時刻情報を、連続した時刻情報に補正するための情報を含む
請求項12に記載の送信装置。 - 前記メタデータは、前記モードに応じて、基準となる基準時刻と、不連続となる不連続時刻とのオフセット値を含む
請求項13に記載の送信装置。 - 前記不連続となる時刻情報は、うるう秒又は夏時間(DST)であって、
前記複数の時刻情報は、UTC、PTP、又はローカル時刻のいずれかを少なくとも含む
請求項14に記載の送信装置。 - 前記モードが、UTCに対応したモードである場合、前記オフセット値は、基準時刻とUTCとのオフセット値であって、うるう秒の積算値を表し、
前記モードが、PTPに対応したモードである場合、前記オフセット値は、PTPをUTCに変換するためのオフセット値であり、
前記モードが、ローカル時刻に対応したモードである場合、前記オフセット値は、基準時刻とローカル時刻とのオフセット値であって、うるう秒の積算値と、夏時間(DST)の変動値とを加算した値を表している
請求項15に記載の送信装置。 - 前記メタデータを含む放送ストリームは、IP伝送方式に対応した放送ストリームであって、
前記メタデータは、UDPパケットを含むIPパケットに含まれる記述子、前記IPパケットを伝送するための第1の伝送パケットの拡張ヘッダ、前記第1の伝送パケットを伝送するための第2の伝送パケットの拡張ヘッダ、前記第1の伝送パケットに含まれるシグナリング、前記シグナリングのヘッダ、又は、物理層フレームに付加されている
請求項12に記載の送信装置。 - 送信装置のデータ処理方法において、
前記送信装置が、
複数の時刻情報に対応したモードに応じた時刻情報に関する処理を行うための情報を含むメタデータを生成し、
前記メタデータを送信する
ステップを含むデータ処理方法。 - 複数の時刻情報に対応したモードに応じた時刻情報に関する処理を行うための情報を含むメタデータであって、うるう秒の挿入又は削除を示すフラグを含む前記メタデータを受信する受信部と、
前記フラグに応じた値をカウントするカウンタと、
前記カウンタの値に応じて、前記時刻情報のうるう秒を補正する処理部と
を備える受信装置。 - カウンタを有する受信装置のデータ処理方法において、
前記受信装置が、
複数の時刻情報に対応したモードに応じた時刻情報に関する処理を行うための情報を含むメタデータであって、うるう秒の挿入又は削除を示すフラグを含む前記メタデータを受信し、
前記カウンタによって、前記フラグに応じた値をカウントし、
前記カウンタの値に応じて、前記時刻情報のうるう秒を補正する
ステップを含むデータ処理方法。
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CA3001275A1 (en) | 2017-04-20 |
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