JP6949188B2 - Receiver and program - Google Patents

Description

The present invention relates to a receiving device and a program for receiving a signal of contents such as broadcasting.

In next-generation television broadcasting, transmission by the MMT (MPEG Media Transport) method is being considered. This MMT method can transmit video, audio, subtitles, etc. by broadcasting or by a communication line due to a hierarchical protocol configuration. In this MMT method, video, audio, subtitles, and character supermarkets are transmitted as "assets", and "packages" composed of a plurality of assets are transmitted as a set of contents.

Non-Patent Document 1 describes provisions regarding transmission by MMT. In particular, Chapter 9 (pages 118 to 125) of Non-Patent Document 1 describes provisions for transmission of subtitles and character superimpose (hereinafter, may be referred to as "subtitles, etc."). .. In this regulation, for subtitles and the like, a text in which the presentation time (presentation time) on the receiving device side is specified may be transmitted. Text to which information on the presentation time is added in this way is called timed text (text associated with the time). Further, for transmission of subtitles and the like, timed text is described using TTML (Timed Text Markup Language) inside the subtitle asset. In this way, the timed text has information on the presentation time added, but relative time is used to specify the time in TTML so that it can flexibly respond to changes in broadcast time and rebroadcast. May be done. The relative time is expressed as a relative time in the format of "hh: mm: ss" (hours, minutes, seconds), with the start time of sending the subtitle content as zero. In order to convert the relative time into an absolute time for presenting the subtitles and the like on the receiver side, the information of the absolute time at the start of sending the subtitle content is required. The information of the time at the start of transmission of the subtitle content is transmitted as a part of the additional identification information of the subtitle / character super transmission method. Table 9-3 (page 122) of Non-Patent Document 1 describes the structure of this additional identification information. Specifically, when TMD (time control mode) is 0010 (meaning TTML description (reference start time starting point)), reference_start_time (reference start time) information is included as a part of this additional identification information. That is shown in Table 9-3.

Media transport system by MMT in digital broadcasting, MMT-based media transport scheme in digital broadcasting systems, standard ARIB STD-B60 1.2 version, Association of Radio Industries and Businesses, March 17, 2015

By the way, it is stipulated that UTC (Coordinated Universal Time) is used as the above reference_start_time. And in UTC, leap seconds may be implemented. Leap seconds are those that insert or remove seconds on a given day in order to adjust for the difference that occurs between the time system based on the rotation of the earth and UTC. When the leap second is implemented, there may be a problem that the operation timing of the standardized device shifts under the assumption that 1 minute = 60 seconds. Regarding subtitles, there is a problem that there is a discrepancy between the time specified as the presentation time (= presentation time intended by the creator) and the actual presentation time on the receiving device (television receiver) side. ..

The present invention has been made in consideration of the above circumstances, and a receiving device and a program thereof that do not cause a deviation in the presentation timing of subtitles and the like even in a situation related to the time when the leap second is executed. Is intended to provide.

[1] In order to solve the above problems, the receiving device according to one aspect of the present invention includes a receiving unit that receives a transmission signal of contents including a timed text, and the timed text included in the transmission signal. Timed text processing to acquire information on the reference start time and a reference start time leap second indicator indicating whether or not the reference start time is within a predetermined length of time before the leap second is executed. It is characterized by having a part and.

[2] Further, in one aspect of the present invention, in the above receiving device, the timed text processing unit receives information on the presentation start time and the presentation end time designated as relative times starting from the reference start time. The added timed text is acquired, and a clock is provided inside to manage the time in the receiving device, and the time in the receiving device is synchronized with the standard time received from the outside at least at a predetermined timing. The time management unit in the device, the presentation unit that starts and ends the presentation of the timed text based on the relative time according to the time in the receiving device managed by the time management unit in the receiving device, and the reference start. A leap second adjusting unit that adjusts the timing at which the presenting unit starts or ends the presentation of the timed text by correcting the relative time shift caused by the leap second based on the time leap second indicator. Is further provided.

In the above receiving device, the leap second adjustment unit adjusts the above timing based on whether or not the current standard time is within a predetermined length of time before the leap second is executed.
The first means for the leap second adjuster to know whether the current standard time is within a predetermined length of time before the leap second is implemented is the current time leap included in the additional identification information. Refer to the second specifier. In this case, the receiving device does not need to particularly refer to the leap second indicator (current time leap second indicator) that is separately transmitted by means such as NTP (Network Time Protocol).
Further, the second means for the leap second adjusting unit to know whether or not the current standard time is within a predetermined length of time before the leap second is executed is separately transmitted by means such as NTP. Based on the leap second indicator (current time leap second indicator), the time management unit in the receiving device notifies the leap second adjustment unit of the information. In this case, the additional identification information does not have to include the current time leap second indicator. One aspect of notification from the time management unit in the receiving device to the leap second adjustment unit is information on the leap second correction state. This leap second correction state information includes information on whether or not the current standard time is within a predetermined length of time before the leap second is implemented, as well as other information necessary for timing control. You may.

[3] Further, in one aspect of the present invention, in the above receiving device, the reference start time leap second indicator and the current time leap second indicator are both of a predetermined length before the implementation of the leap second. When indicating that the leap second is within, it also indicates whether the leap second is the insertion or deletion of the second, and the time management unit in the receiving device always sets the time in the receiving device to the standard time. It manages to synchronize and notifies the leap second adjustment unit of information on the leap second correction state. In the leap second adjustment unit, (1) the reference start time leap second indicator executes the leap second. It indicates that it is within the time of the previous predetermined length, and that the leap second is the insertion of a second, and (1a) the leap notified from the time management unit in the receiving device. The second correction state indicates that the time is not within a predetermined length of time before the leap second is executed. (1b) The leap second correction state notified from the time management unit in the receiving device is the time in the receiving device. Indicates that the leap second correction has been completed with respect to (1c). The leap second correction state notified from the time management unit in the receiving device indicates that the current time is the inserted second. In the case of any of the above states (1a), (1b) or (1c) shown, one second before the time obtained by adding the reference start time and the relative time assuming that there is no leap second. At the time when the time in the receiving device arrives, the presenting unit adjusts to start or end the presentation corresponding to the relative time, and (2) the reference start time leap second indicator is leap second. Indicates that the leap second is within a predetermined length of time before the implementation of the above, and indicates that the leap second is the deletion of the second, and (2a) notified from the time management unit in the receiving device. (2b) The leap second correction state notified from the time management unit in the receiving device is the receiving device, indicating that the leap second correction state is not within a predetermined length of time before the leap second is executed. In the case of either the above (2a) or (2b) state indicating that the leap second correction has been completed with respect to the internal time, the reference start time and the relative time are leap seconds. At a time when the time in the receiving device arrives at a time one second after the time added assuming that there is no leap second, the presentation unit adjusts to start or end the presentation corresponding to the relative time. 3) If it is neither (1) nor (2) above, it is added to the reference start time and the relative time assuming that there is no leap second. At the timing when the time in the receiving device arrives, the presenting unit adjusts to start or end the presentation corresponding to the relative time.

[4] Further, in one aspect of the present invention, in the above receiving device, the reference start time leap second indicator and the current time leap second indicator are both of a predetermined length before the implementation of the leap second. When indicating that the leap second is within, it also indicates whether the leap second is insertion or deletion of the second, and the time management unit in the receiving device performs an operation based on a predetermined operation signal. The time in the receiving device is managed to be synchronized with the standard time only at the timing performed by the receiving device, and the leap second correction state information is notified to the leap second adjusting unit. , (1a) Indicates that the reference start time leap second indicator is within a predetermined length of time prior to the implementation of the leap second, and that the leap second is an insertion of a second. When indicating that the leap second correction state notified from the time management unit in the receiving device is not within a predetermined length of time before the implementation of the leap second, (1b) the reference start time leap second indicator The leap second correction state, which indicates that it is not within a predetermined length of time before the leap second is executed and is notified by the time management unit in the receiving device, is delayed from the standard time in the receiving device. (1) In the case of either (1a) or (1b) above, the time obtained by adding the reference start time and the relative time assuming that there is no leap second. At the timing when the time in the receiving device arrives at a time one second before, the presentation unit adjusts to start or end the presentation corresponding to the relative time, and (2a) the reference start time leap second. The second indicator indicates that the leap second is within a predetermined length of time before the execution of the leap second, and that the leap second is the deletion of the second, and from the time management unit in the receiving device. When the notified leap second correction state indicates that it is not within the time of the predetermined length before the leap second is executed, (2b) the reference start time leap second indicator is the predetermined length before the leap second is executed. It indicates that the time is not within the above time, and that the leap second correction state notified from the time management unit in the receiving device is a state in which the time in the receiving device precedes the standard time. In the case of (2), in the case of either (2a) or (2b) above, the time is one second after the time obtained by adding the reference start time and the relative time assuming that there is no leap second. At the timing when the time in the receiving device arrives, the presentation unit adjusts to start or end the presentation corresponding to the relative time. , (3) In the case of neither (1) nor (2) above, the time in the receiving device reaches the time obtained by adding the reference start time and the relative time assuming that there is no leap second. The timing is characterized in that the presentation unit adjusts to start or end the presentation corresponding to the relative time.

[5] Further, in one aspect of the present invention, in the above receiving device, the receiving unit is the transmitted signal by the MPEG media transport method, and the timed text in the MH-data coding method descriptor. Upon receiving the transmission signal in which the reference start time leap second indicator is stored in a part of the additional identification information, the timed text processing unit receives the reference start time leap second instruction stored in the additional identification information. It is characterized by acquiring a child.

[6] Further, in one aspect of the present invention, a computer is provided with a timed text to which information on a presentation start time and a presentation end time designated as a relative time is added, information on a reference start time, and the reference start time. Is a program for functioning as a reference start time leap second indicator indicating whether or not is within a predetermined length of time before the implementation of the leap second, and a timed text processing means for acquiring the leap second.
Further, in one aspect of the present invention, a computer is provided with a timed text to which information on a presentation start time and a presentation end time designated as a relative time is added, information on a reference start time as a starting point of the relative time, and information on a reference start time. Received by a reference start time shun second indicator indicating whether or not the reference start time is within a predetermined length of time before the implementation of the squid, a timed text processing means for acquiring the reference start time, and an internal clock. A time management means in the receiving device that manages the time in the device and synchronizes the time in the receiving device with a standard time received from the outside at at least a predetermined timing, and a time in the receiving device managed by the time management means in the receiving device. According to the presenting means for starting and ending the presentation based on the relative time of the timed text, by correcting the deviation of the relative time caused by the relative time based on the reference start time shun second indicator. , Is a program for functioning as a quiet second adjusting means for adjusting the timing at which the presenting means starts or ends the presentation of the timed text.

Further, one aspect shows that in the above-mentioned receiving device, both the reference start time slack second indicator and the current time slack second indicator are within a predetermined length of time before the implementation of the stake second. In the case, it also indicates whether the quiet second is the insertion or deletion of the second, and the time management unit in the receiving device manages the time in the receiving device so as to always synchronize with the standard time. The shaving second adjusting unit indicates that (1) the reference start time shaving second indicator is within a predetermined length of time before the execution of the shaving second, and the shaving second is inserted in seconds. In the case of indicating that the current time of the time is not within a predetermined length of time before the execution of the time of the day, the reference start time and the relative time are used. Is adjusted so that the presentation unit starts or ends the presentation corresponding to the relative time at the timing when the time in the receiving device arrives at the time one second before the time when is added assuming that there is no quiet second. (2) It indicates that the reference start time slack second indicator is within a predetermined length of time before the implementation of the sloping second, and that the sloping second is the deletion of the second. Further, when indicating that the current time stagnation indicator is not within a predetermined length of time before the implementation of the stagnation second, the reference start time and the relative time are added assuming that there is no stagnation second. At the timing when the time in the receiving device arrives at a time one second after the time, the presenting unit adjusts to start or end the presentation corresponding to the relative time, and (3) the above (1). ) Or (2), the relative time corresponds to the time when the time in the receiving device arrives at the time obtained by adding the reference start time and the relative time assuming that there is no number of seconds. It is characterized in that the presentation unit adjusts to start or end the presentation.

Further, one aspect shows that in the above receiving device, both the reference start time leap second indicator and the current time leap second indicator are within a predetermined length of time before the implementation of the leap second. In the case, it also indicates whether the leap second is the insertion or deletion of the second, and the time management unit in the receiving device only performs the operation based on the predetermined operation signal only at the timing when the receiving device performs the operation. In, the time in the receiving device is managed to be synchronized with the standard time, and the time in the receiving device is synchronized with the standard time, or the time in the receiving device precedes the standard time. The leap second adjustment unit notifies the leap second adjustment unit of information indicating whether the time in the receiving device is later than the standard time, or the leap second adjustment unit has (1a). The reference start time leap second indicator indicates that the leap second indicator is within a predetermined length of time prior to the execution of the leap second, and indicates that the leap second is an insertion of a second, and the current time leap second. A notification in the receiver indicating that the second indicator is not within a predetermined length of time prior to the leap second is performed and that the time in the receiver is in sync with the standard time. When received from the time management unit, (1b) indicates that the reference start time leap second indicator is not within a predetermined length of time before the leap second is executed, and the time in the receiving device is greater than the standard time. When a notification indicating that the state is delayed is received from the time management unit in the receiving device, (1) if any of the above (1a) or (1b), the reference start time and the above are mentioned. At the timing when the time in the receiving device arrives at a time one second before the time obtained by adding the relative time as having no leap second, the presentation unit starts or ends the presentation corresponding to the relative time. (2a) Indicates that the reference start time leap second indicator is within a predetermined length of time prior to the implementation of the leap second, and that the leap second is a deletion of seconds. It indicates that the current time leap second indicator is not within a predetermined length of time before the leap second is executed, and the time in the receiving device is synchronized with the standard time. When a notification indicating is received from the time management unit in the receiving device, (2b) indicates that the reference start time leap second indicator is not within a predetermined length of time before the leap second is executed, and the receiving device. Receive a notification from the time management unit in the receiving device indicating that the internal time is ahead of the standard time. In the case of (2), in the case of either (2a) or (2b) above, the time one second after the time obtained by adding the reference start time and the relative time assuming that there is no slack second. In addition, at the timing when the time in the receiving device arrives, the presenting unit adjusts to start or end the presentation corresponding to the relative time, and (3) any of (1) and (2) above. If not, the presentation start or presentation end corresponding to the relative time is set at the timing when the time in the receiving device arrives at the time obtained by adding the reference start time and the relative time assuming that there is no quiet second. It is characterized in that it is adjusted so that the presentation unit performs it.

Further, in one aspect, in the receiving device, the receiving unit receives the transmission signal in which the current time leap second indicator is also stored in a part of the additional identification information regarding the timed text, and the leap second is received. The second adjusting unit is characterized in that it performs processing based on the current time leap second indicator stored in the additional identification information.

Further, as one aspect of the present invention, a transmission device corresponding to the above-mentioned receiving device or the like may be configured.

According to the present invention, even in a situation where a leap second (insertion of seconds or deletion of seconds) is performed, presentation of a timed text specified by a relative time starting from a reference start time is started or is performed. The timing of the end of presentation can be corrected. As a result, the receiving device can present the timed text (subtitles, etc.) at an appropriate timing.

It is a block diagram which shows the schematic functional structure of the receiving device by 1st Embodiment of this invention. It is a block diagram which shows the schematic functional structure of the transmission device by the same embodiment. It is the schematic which shows the structural example of the television system including the receiving device and the transmitting device by the same embodiment. It is a schematic diagram which shows the structure of the additional identification information such as a subtitle used in this embodiment. It is a schematic diagram which shows the relationship between the value and the meaning of the reference start time leap second indicator (reference start time LI) by the same embodiment. This is the first half of the flowchart showing the operation procedure of the receiving device regarding the adjustment of the leap second in the presentation of the subtitles and the like according to the same embodiment. This is the latter half of the flowchart showing the procedure of the operation of the receiving device regarding the adjustment of the leap second in the presentation of the subtitles and the like according to the same embodiment. It is a block diagram which shows the schematic functional structure of the receiving device by 2nd Embodiment of this invention. This is the first half of the flowchart showing the operation procedure of the receiving device regarding the adjustment of the leap second in the presentation of the subtitles and the like according to the same embodiment. This is the latter half of the flowchart showing the procedure of the operation of the receiving device regarding the adjustment of the leap second in the presentation of the subtitles and the like according to the same embodiment. In the receiving device 8 according to the same embodiment, the time (T1, T2, T3) to be used for the subtitle presentation control according to the reference start time LI (LI1), the additional_Arib_Subtitle_Info LI (LI2), and the time synchronization state S. It is a table showing. It is a schematic diagram which shows the example of the presentation control of the subtitles and the like using the 1st embodiment and the 2nd embodiment, and shows the case of the insertion of seconds. It is a schematic diagram which shows the example of the presentation control of the subtitles and the like using the 1st embodiment and the 2nd embodiment, and shows the case of deleting a second. It is a block diagram which shows the schematic functional structure of the receiving apparatus according to 3rd Embodiment of this invention. It is a schematic diagram which shows the structure of the additional identification information for use in the transmission of a subtitle and a character supermarket in the same embodiment. It is a flowchart which shows the procedure of operation of the receiving device concerning the adjustment of the leap second in the presentation of the subtitles and the like by the same embodiment. It is a block diagram which shows the schematic functional structure of the receiving apparatus according to 4th Embodiment of this invention. It is a flowchart which shows the procedure of operation of the receiving device concerning the adjustment of the leap second in the presentation of the subtitles and the like by the same embodiment. It is a schematic diagram which shows the relationship between the clock management and the leap second correction state (state S) inside each receiving apparatus of 3rd Embodiment and 4th Embodiment (when seconds are inserted). It is a schematic diagram which shows the relationship between the clock management and the leap second correction state (state S) in each of the receiving apparatus of 3rd Embodiment and 4th Embodiment (when a second is deleted).

Next, an embodiment of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a block diagram showing a schematic functional configuration of a receiving device according to the present embodiment. In the figure, reference numeral 1 is a receiving device. The receiving device 1 is a television receiver for receiving television broadcasts and the like. As shown in the figure, the receiving device 1 includes a receiving unit 11, a channel selection unit 12, a demodulation unit 14, a separation unit 15, a video decoding unit 21, an audio decoding unit 22, a character super processing unit 23, and subtitles. The processing unit 24, the time information reception processing unit 31, the time management unit 32 in the receiving device, the presentation unit 51, and the leap second adjustment unit 52 are included.

The receiving unit 11 receives a broadcast signal (transmission signal) from the outside. It should be noted that this broadcast signal includes timed text (subtitles and texts of supermarkets to which information on the presentation time is added). Further, this broadcast signal is transmitted by an MMT (MPEG Media Transport) transmission method.
The channel selection unit 12 selects a broadcast signal received by the reception unit 11. Specifically, the channel selection unit 12 controls the receiving unit 11 to receive the broadcast signal of the channel corresponding to the remote control number instructed by the remote control device (not shown) or the like.
The demodulation unit 14 demodulates the broadcast signal received by the reception unit 11.

The separation unit 15 separates the broadcast signal demodulated by the demodulation unit 14 and extracts the signal of each asset constituting the content and other control signals. Then, the separation unit 15 supplies the video asset data to the video decoding unit 21, the audio asset data to the audio decoding unit 22, the character super asset data to the character super processing unit 23, and the subtitle asset. The data is supplied to the subtitle processing unit 24. Time information is included as a part of the control information extracted by the separation unit 15. This time information will be described later.

The video decoding unit 21 decodes the data of the video asset supplied by the separation unit 15 and outputs the obtained video.
The voice decoding unit 22 decodes the data of the voice asset supplied by the separation unit 15 and outputs the obtained voice signal.

The character super processing unit 23 processes the character super data supplied by the separation unit 15, forms a screen of the character super on a predetermined plane, and outputs an image of the plane. When the presentation start time and the presentation end time are specified in the character super data, the character super processing unit 23 outputs the image of the plane in time for the designated time.

The subtitle processing unit 24 processes the subtitle data supplied by the separation unit 15, forms a subtitle screen on a predetermined plane, and outputs an image of the plane. When the presentation start time and the presentation end time are specified in the subtitle data, the subtitle processing unit 24 outputs the plain image in time for the specified time.

The character super processing unit 23 and the subtitle processing unit 24 are also collectively referred to as a "timed text processing unit". The character super processing unit 23 and the subtitle processing unit 24, respectively, acquire additional identification information and timed text to which information of the presentation start time and the presentation end time designated as relative times is added. These are the information contained in the transmitted signal. This additional identification information includes a current time leap second indicator indicating whether or not the time (current time) transmitted from the transmitting device on the broadcasting station side is within a predetermined length of time before the implementation of the leap second. Includes information on the reference start time that is the starting point of the relative time, and a reference start time leap second indicator that indicates whether or not the reference start time is within a predetermined length of time before the leap second is implemented. There is. The character super processing unit 23 and the subtitle processing unit 24 pass the acquired information to the presentation unit 51 for controlling the presentation timing of the subtitles and the like.

The time information reception processing unit 31 processes the time information extracted by the separation unit 15. This time information is included in the broadcast signal and is transmitted using NTP (Network Time Protocol) on IP (Internet Protocol). NTP is specified in documents such as IETF RFC 5905 "Network Time Protocol Version 4: Protocol and Algorithms Specification". The data transmitted by NTP includes at least a leap indicator (leap indicator) in addition to the information representing the current time or the information for calculating the current time. The data notified to the receiver by NTP is represented by Coordinated Universal Time (UTC).

The time information reception processing unit 31 performs the following processing based on the data notified by NTP.
That is, first, the time information reception processing unit 31 converts the current time represented by UTC into the data of the local time (local time), if necessary. When the receiving device 1 is used in Japan, the local time is Japan Standard Time (JST). Second, the time information reception processing unit 31 notifies the time management unit 32 in the receiving device of the time notified by NTP (hereinafter, may be referred to as "NTP time" for convenience) at a necessary timing. .. The frequency at which the time information reception processing unit 31 notifies the NTP time to the time management unit 32 in the receiving device is such that at least the time management unit 32 in the receiving device corrects the value of the internal clock using the NTP time. Higher than frequency. The frequency and timing of the configuration of this clock will be described later. Third, the time information reception processing unit 31 passes the leap second indicator information received by NTP to the presentation unit 51 (particularly, the leap second adjustment unit 52 existing in the presentation unit 51).

Here, the leap second indicator received by NTP may be referred to as "NTP leap second indicator" or "NTP-LI" for convenience. The reason for calling it this way is to distinguish it from another leap second indicator (that is, the reference start time leap second indicator (reference start time LI)). The NTP leap second indicator is data that takes any numerical value of 0, 1, or 2. A value of 1 for the NTP leap second indicator indicates that a second is inserted at the end of the day in Coordinated Universal Time (after 23:59:59). That is, when the value of the NTP leap second indicator is 1, it means that the second is inserted after the next arrival (24-hour system) 08:59:59 in Japan time. Also, if the value of the NTP leap second indicator is 2, it means that the last second of the day in Coordinated Universal Time, that is, 23:59:59, is deleted. That is, when the value of the NTP leap second indicator is 2, it means that the next arrival (24-hour system) 08:59:59 in Japan time is deleted. And when the value of the NTP leap second indicator is 0, it means that the second is neither inserted nor deleted on the day in Coordinated Universal Time. That is, if the value of the NTP leap second indicator is 0, it means that the second will not be inserted or deleted at 08:59:59 (24-hour clock), which is the next arrival in Japan time. That is, when the value of the NTP leap second indicator is 0, it means that the leap second is not executed in the normal state.

As mentioned above, the value 1 or 2 is displayed in the NTP leap second indicator from 00:00:00 (24-hour clock) on the day when the leap second is implemented in Coordinated Universal Time. Until the time when the second is implemented. This is as follows in Japan time. That is, the value 1 or 2 is displayed in the NTP leap second indicator from 09:00:00 (24-hour system) on the day before the leap second is implemented in Japanese time. Until the time of implementation. At other times, that is, in normal times when leap seconds are not performed, the value of the NTP leap second indicator is 0.

Organize leap second directives. As explained above, the information indicating whether or not the current time is within a predetermined length of time before the implementation of the leap second is the current time leap second indicator. In the present embodiment, the current time leap second indicator is transmitted in a form included in the additional identification information, and is also included in the NTP data and transmitted. The NTP data may be transmitted in a form included in the broadcast signal, may be transmitted by a communication line between the receiving device and the external server device, or may be transmitted by both of them. As described above, the current time leap second indicator included in the NTP data may be referred to as "NTP leap second indicator" or "NTP-LI" for convenience. On the other hand, the information indicating whether or not the reference start time is within a predetermined length of time before the leap second is executed is the reference start time leap second indicator. This reference start time leap second indicator is transmitted in a form included in the additional identification information.
In another embodiment described later, the current time leap second indicator may not be included in the additional identification information. In such a case, the receiving device refers to the above-mentioned NTP leap second indicator (also the current time leap second indicator), so that the current time is a predetermined length of time before the implementation of the leap second. Information indicating whether or not it is within can be acquired.

The time management unit 32 in the receiving device has an internal clock in the receiving device to manage the time in the receiving device, and synchronizes the time in the receiving device with the standard time (NTP time) received from the outside at least at a predetermined timing. Let me. The clock in the receiving device normally advances based on a predetermined reference (clock signal or the like) in the receiving device. The time management unit 32 in the receiving device corrects the clock in the receiving device at a predetermined timing by using the NTP time notified from the time information receiving processing unit 31. The time indicated by the clock in the receiving device is hereinafter referred to as "time in the receiving device" for convenience. Further, the time management unit 32 in the receiving device supplies the information of the time in the receiving device to the presenting unit 51.
The time management unit 32 in the receiving device in the present embodiment corrects the clock in the receiving device using the above NTP time every second. That is, the time management unit 32 in the receiving device manages the time in the receiving device so as to always synchronize with the NTP time (standard time).

The presentation unit 51 synthesizes the video of each plane supplied from the video decoding unit 21, the character super processing unit 23, and the subtitle processing unit 24 into one video, and outputs the video signal to the outside. Usually, the video signal output from the presentation unit 51 is supplied to a display device (for example, a liquid crystal display or an electroluminescence display) and displayed as a video. Further, the presentation unit 51 outputs the voice supplied from the voice decoding unit 22 to the outside. Normally, the audio signal output from the presentation unit 51 is supplied to a speaker (including earphones and the like) and output as sound. The presentation unit 51 is based on the information of the presentation time (presentation time) added to each content such as video and audio, and according to the time in the receiving device supplied from the time management unit 32 in the receiving device. And output audio.
Regarding the subtitles and character superimposes received as timed text, the presentation unit 51 starts and ends the presentation based on the designated relative time according to the time in the receiving device managed by the time management unit 32 in the receiving device. conduct.

The leap second adjustment unit 52 adjusts the leap second with respect to the presentation time, if necessary, when the presentation unit 51 outputs the above-mentioned video and audio. Specifically, the leap second adjustment unit 52 receives additional identification information from the character super processing unit 23 and the subtitle processing unit 24, respectively, regarding the presentation of the character supermarket and the subtitle, and the content of the additional identification information and the time information. The leap second is adjusted according to the NTP leap second indicator passed from the reception processing unit 31. Then, the leap second adjustment unit 52 instructs the presentation unit 51 of the timing corrected by adjusting the leap second (timing at which the presentation of the subtitle or the like is started or ended).

That is, the leap second adjustment unit 52 determines whether or not the reference start time leap second indicator and the current standard time (time obtained by NTP or the like) are within a predetermined length of time before the implementation of the leap second. The presentation unit 51 is timed by correcting the relative time shift caused by the leap second based on the current time leap second indicator (the leap second indicator stored in the latest received additional identification information). Adjust the timing to start or end the presentation of the text.

The contents of the above additional identification information will be described later. The details of adjusting the leap second in the presentation of character supermarkets and subtitles will be described later.
The leap second adjustment unit 52 may adjust the leap second only for one of the superimpose and the subtitle, which is necessary. Further, the leap second adjustment unit 52 may exist outside the presentation unit 51.

Next, a transmission device that is a side that transmits a broadcast signal will be described.
FIG. 2 is a block diagram showing a schematic functional configuration of the transmission device according to the present embodiment. The transmission device 2 is equipment such as a broadcasting station, and transmits a broadcast signal of a television. As shown in the figure, the transmission device 2 includes a video coding unit 61, an audio coding unit 62, a character super setting unit 63, a subtitle setting unit 64, a time information setting unit 71, and a leap second display setting unit 72. , A mixing unit 81, a modulation unit 82, and a transmission unit 83. The transmitting device 2 is operated by a broadcasting company as a part of broadcasting station equipment.

The video coding unit 61 encodes a video input from the outside, creates video asset data, and supplies the data to the mixing unit 81.

The voice coding unit 62 encodes the voice input from the outside, creates voice asset data, and supplies the data to the mixing unit 81.

The character super asset setting unit 63 creates data of the character super asset and supplies it to the mixing unit 81 via the leap second display setting unit 72. Information on the presentation time (presentation start time and presentation end time) may be added to the character super asset data.

The subtitle setting unit 64 creates subtitle asset data and supplies it to the mixing unit 81 via the leap second display setting unit 72. Information on the presentation time (presentation start time and presentation end time) may be added to the data of the subtitle asset.
The character super setting unit 63 and the subtitle setting unit 64 are also collectively referred to as a "timed text setting unit".

The time information setting unit 71 sets the above-mentioned NTP data for transmission to the receiving device 1 side and supplies the data to the mixing unit 81. The time information setting unit 71 creates time information for transmission to the receiving device 1 side based on information from a clock managed internally or an external device. Here, an example of an external device is a higher-level NTP server on the network. The data set by the time information setting unit 71 includes the data of the NTP leap second indicator (NTP-LI) in addition to the information for obtaining the current time on the receiving device 1 side. The time information setting unit 71 sends the data of this NTP to the receiving device 1 side by NTP on the IP.

The leap second display setting unit 72 sets the reference start time in each additional identification information, if necessary, with respect to the character super asset supplied from the character super setting unit 63 and the subtitle asset supplied from the subtitle setting unit 64. Set the value of the leap second indicator (reference start time LI). The leap second display setting unit 72 is set based on, for example, the value of the NTP leap second indicator (NTP-LI) obtained from the NTP server unit (not shown) provided inside the transmission device 2 or an external NTP server device. Determine the value of the reference start time LI to be. The leap second display setting unit 72 also sets the current time leap second indicator in the additional identification information.
The details of the additional identification information of the character supermarket and the subtitle and the reference start time LI included in the additional identification information will be described later.

The mixing unit 81 mixes the data of each asset output from the video coding unit 61, the audio coding unit 62, the character super setting unit 63, and the subtitle setting unit 64, and other control signals to form a set. Output the broadcast signal. The above NTP data is also included as a part of the control signal. In addition, the character super asset and the subtitle asset each include the above-mentioned additional identification information.

The modulation unit 82 modulates the carrier wave using the broadcast signal output from the mixing unit 81.

The transmission unit 83 outputs the broadcast signal modulated by the modulation unit 82 to the outside. The broadcast signal output from the transmission unit 83 is conveyed as a radio wave or by a cable for cable television.

FIG. 3 is a schematic view showing a configuration example of a television system including a receiving device 1 and a transmitting device 2. In the figure, reference numeral 3 is a receiving device, and 4 is a retransmission device. Further, 5 is an NTP server device. The schematic functional configurations of the receiving device 1 and the transmitting device 2 are as described above. The transmission device 2 transmits the above-mentioned broadcast signal as a radio wave from a transmission antenna (not shown). The broken line in the figure represents a broadcast signal transmitted by radio waves. The receiving device 3 receives the broadcast signal transmitted from the transmitting device 2 through a receiving antenna (not shown). The retransmission device 4 transmits the broadcast signal received by the receiving device 3 via the cable of the cable television system. This cable is a metal wire that propagates high frequency electrical signals. The receiving device 3 and the retransmitting device 4 are operated by a cable television operator that retransmits the broadcast. The receiving device 1 receives the broadcast signal transmitted from the transmitting device 2 through a receiving antenna (not shown). Alternatively, the receiving device 1 receives the broadcast signal transmitted from the retransmitting device 4 via the cable. The receiving device 1 is actually provided for each household or individual, but in the figure, only six receiving devices 1 are shown.

Further, in the figure, reference numeral 5 is an NTP server device. The NTP server device 5 and the transmitting device 2 are connected by an IP network, and can send and receive IP packets to and from each other. Seen from the transmitting device 2, the NTP server device 5 is a higher-level server device in NTP. As an example, the transmitting device 2 acquires necessary time information from the NTP server device 5.

Next, the data used for adjusting the leap second in the presentation of subtitles and the like in the receiving device 1 and the transmitting device 2 will be described.
FIG. 4 is a schematic diagram showing the structure of additional identification information for use in the transmission of subtitles and character supermarkets. This additional identification information is data stored in the MH-data coding method descriptor provided for each asset in the transmission by the MMT method. Basically, the MP table is transmitted from the transmitting device 2 in a cycle of 0.1 seconds.

The figure shows the data structure of the additional identification information, the number of bits of each data item included in the data structure, and the data notation. The data structure is described in a formal language having a block structure. The numbers on each line are added to the left end of the figure for convenience. Note that "uimsbf" in the data notation is an abbreviation for "unsigned integer most significant bit first", and indicates that it is an unsigned integer and the most significant bit is the first. Further, "bslbf" is an abbreviation for "bit string, left bit first", and indicates that it is a bit string and the left bit is the first.

Each data item included in the additional identification information will be described below.
(1) The description on the first line indicates that the structure called Additional_Arib_Subtitle_Info (additional information of subtitles defined by ARIB) includes the data from the second line to the 21st line. The right parenthesis (closing curly brace) corresponding to the left parenthesis (opening curly brace) on the first line exists on the 23rd line.
(2) The description on the second line defines the data item subtitle_tab (subtitle identification tag). This is a label for identifying a stream of subtitles or character supermarkets. The data notation is uimsbf.
(3) The description on the third line defines the data item subtitle_info_version (subtitle information version). Indicates the version of additional identification information for subtitles and character supermarkets. The data notation is uimsbf.
(4) The description on the fourth line defines the data item start_mpu_sequence_number_flag (start MPU sequence number flag). It is a flag indicating whether to place the field of the subsequent start_mpu_sequence_number item. If this value is bit "1", start_mpu_sequence_number is placed. If this value is bit "0", start_mpu_sequence_number is not placed. The data notation is bslbf.

(5) The description on the fifth line defines the data item leap_indicator (leap second indicator). This field stores a leap second indicator corresponding to the time (that is, the current time) when the additional identification information is transmitted from the broadcasting station side. This data item is also called a "current time leap second indicator". The data notation is uimsbf. This data item leap_indicator is data that takes a value of 0, 1, or 2.

If the value of this data item leap_indicator is 1, it means that seconds will be inserted at the end of the day in Coordinated Universal Time (after 23:59:59). That is, when the value of the NTP leap second indicator is 1, it means that the second is inserted after the next arrival (24-hour system) 08:59:59 in Japan time. However, when seconds are inserted as leap seconds, the value of this data item leap_indicator corresponding to the inserted seconds is 0. That is, when a second is inserted as a leap second, the second immediately before the inserted second (that is, 08 on the leap second implementation date in Japan time) from 09:00:00 on the day before the leap second implementation date in Japan time. Until 1:59:59), the value of this data item leap_indicator is 1. Then, the inserted second (that is, 08:59:60 on the leap second implementation date in Japan time (however, the data notation in the information processing device such as the receiving device according to the present embodiment is "08:59:59"). The value of this data item leap_indicator corresponding to)) is 0. Then, after the leap second execution is completed, that is, at 09:00:00 on the leap second execution date in Japan time and thereafter, the value of this data item leap_indicator is 0.

Also, if the value of this data item leap_indicator is 2, it means that the last second of the day in Coordinated Universal Time, that is, 23:59:59, is deleted. That is, when the value of the NTP leap second indicator is 2, it means that the next arrival (24-hour system) 08:59:59 in Japan time is deleted. That is, when a second is deleted as a leap second, the second immediately before the deleted second (that is, 08 on the leap second implementation date in Japan time) from 09:00:00 on the day before the leap second implementation date in Japan time. Until: 59:58), the value of this data item leap_indicator is 2. Then, the value of the corresponding data item leap_indicator is 0 in the second following the deleted second (that is, 09:00:00 on the leap second implementation date in Japan time) and thereafter.

Then, in cases other than the above (that is, when the value of this data item leap_indicator is neither 1 nor 2), the value of this data item leap_indicator is 0.

Note that this data item leap_indicator may be referred to as subtitle_laep_indicator (subtitle leap second indicator), subtitle_info_laep_indicator (subtitle information leap second indicator), subtitle_info_laep_control (subtitle information leap second control), subtitle_laep_control (subtitle leap second control), or the like.

(6) The description on the 6th line defines the data item reserved (unused area). The data notation is bslbf.
(7) The description on the 7th line defines the data item ISO_639_language_code. The language code for the language identified by the subtitle identification tag is represented by the three-letter code of the alphabet defined in ISO 639-2. Each of these three characters is encoded with 8 bits according to ISO8859-1, and the data for 3 characters is a total of 24 bits. The data notation is uimsbf.
(8) The description on the 8th line defines the data item type (subtitle type). When this value is the bit string "00", it means that this stream is a subtitle. When this value is the bit string "01", it means that this stream is a character supermarket. The data notation is bslbf.
(9) The description on the 9th line defines the data item subtitle_format (subtitle description method identification). Specify the description method for subtitles and character supermarkets. The data notation is bslbf.

(10) The description on the 10th line defines the data item OPM (operation mode). Shows the operating mode of the entire system, including the subtitle transmission method and coding. The types of operation modes include live mode, segment mode, and program mode. The data notation is bslbf.
(11) The description on the 11th line defines the data item TMD (time control mode). Represents the time control mode during reception and playback. It indicates by what means the presentation time of subtitles and the like is indicated. When this value is the bit string "0010", it means that the time control method is a TTML description (reference start time starting point). This indicates the presentation time using the time code (time code represented by the relative time starting from the reference start time) in the ARIB-TTML document starting from the reference start time included in this descriptor. Is what is done. If the TMD value is other than the bit string "0010", the description thereof will be omitted. The data notation is bslbf.
(12) The description on the 12th line defines the data item DMF (display mode). The display mode of the subtitle text is shown for each of reception and recording / playback. The data notation is bslbf.

(13) The description on the 13th line defines the data item resolution (display resolution). Indicates the initial state of the display resolution of the subtitle display screen. As the resolution, when expressed by the number of pixels in the horizontal direction and the vertical direction, there are "1920 × 1080", "3850 × 2160", “7680 × 4320” and the like. The data notation is bslbf.
(14) The description on the 14th line defines the data item compression_type (compression method). Represents the compression method of subtitle data. The data notation is bslbf.
(15) The description from the 15th line to the 17th line defines the data item start_mpu_sequence_number (start MPU sequence number) provided depending on the value of the above-mentioned start_mpu_sequence_number_flag. Indicates the sequence number of the first MPU of the subtitle / character super for which the setting by this descriptor is valid. The MPU is a unit in transmission. The data notation is uimsbf.

(16) The description from the 18th line to the 22nd line is when the above-mentioned TMD value is the bit string "0010" (indicating that it is a TTML description (reference start time starting point)) (only in that case). ) Define the data items included in this descriptor. They are reference_start_time, reference_start_time_leap_indicator and reserved.
(16-1) The description on the 19th line defines the data item reference_start_time (reference start time) provided when the time control mode (TMD) is the TTML description (reference start time starting point). This reference start time is an absolute time that is the starting point of the relative time specified in the TTML document. The data notation is uimsbf, and the time is represented by a length of 64 bits.
(16-2) The description on the 20th line is a data item reference_start_time_leap_indicator (reference start time leap second indicator, RST-LI) provided when the time control mode (TMD) is a TTML description (reference start time starting point). To define. Details of this RST-LI are described below. The data notation is uimsbf.
Note that this data item reference_start_time_leap_indicator may be called reference_start_time_laep_control (reference start time leap second control) or the like.
(16-3) The description on the 21st line defines the data item reserved (unused area) provided when the time control mode (TMD) is the TTML description (reference start time starting point). The data notation is bslbf.

The leap_indicator described above (5) is an NTP leap second indicator (NTP-LI) at the time when the additional identification information (including the MH-data encoding method descriptor) is transmitted from the transmission device 2 side. ) Is set. In the prior art, this NTP-LI information was not stored in the additional identification information, but it is one of the key information in the present embodiment, and its usage will be described later. On the transmission device 2 side, the leap second display setting unit 72 sets the value of the reference start time LI.

Further, the reference_start_time_leap_indicator described above (16-2) is a leap second indicator (reference start time LI, RST-LI) of the above-mentioned reference start time. Although this reference start time LI has not been used in the prior art, it is one of the key information in the present embodiment, and its usage will be described later. On the transmission device 2 side, the leap second display setting unit 72 sets the value of the reference start time LI, if necessary.

On the receiving device 1 side, the leap second adjustment unit 52 controls the timing of presentation of subtitles and the like by the leap_indicator (leap second indicator) in (5) and the reference_start_time_leap_indicator (reference start) in (16-2). The leap second indicator of time, RST-LI) is used.
The time when the leap_indicator (leap second indicator) in (5) is almost the latest (when ignoring the delay for waiting for the transmission cycle from the transmission device 2 and the transmission delay from the transmission device 2 to the reception device 1) It is a leap second indicator corresponding to. On the other hand, the reference_start_time_leap_indicator (reference start time leap second indicator, RST-LI) of (16-2) is a leap second indicator corresponding to the start time in the TTML document (that is, the broadcast program). Therefore, at some point in time, the values of these two leap second directives do not always match. The leap second adjustment unit 52 adjusts the leap second in controlling the presentation timing of subtitles and the like by using these two types of leap second indicators. The detailed procedure will be described later with reference to the flowchart.

The transmission device 2 repeatedly transmits the additional identification information frequently, that is, in a sufficiently short transmission cycle. The transmission device 2 transmits the MH-data coding method descriptor including the additional identification information in a transmission cycle of, for example, 0.1 seconds. Then, the receiving device 1 can refer to the additional identification information transmitted in this way. That is, even immediately after the power of the receiving device 1 is turned on or immediately after a specific channel is selected in the receiving device 1, if a maximum of one transmission cycle is waited, additional identification information related to subtitles and the like can be obtained. Can be obtained.

FIG. 5 is a schematic diagram showing the relationship between the value of the reference start time LI and the meaning. As shown in the figure, the reference start time LI can take three values.
When the value of the reference start time LI is "0"("00" in binary notation), this represents a normal (no leap second) state.
When the value of the reference start time LI is "1"("01" in binary notation), this is at the end of the day (in Coordinated Universal Time) including the time indicated by the reference start time included in the additional identification information. , Indicates that seconds are inserted. In other words, it means that the second is inserted after 23:59:59 in Coordinated Universal Time on that day. When using Japan time, it is as follows. That is, from the time indicated by the reference start time included in the additional identification information, it means that the second is inserted after the next arrival (in the 24-hour system of Japan time) 08:59:59.
When the value of the reference start time LI is "2"("10" in binary notation), this is the last of the day (in Coordinated Universal Time) including the time indicated by the reference start time included in the additional identification information. Indicates that seconds will be deleted. In other words, it means that 23:59:59 Coordinated Universal Time on that day will be deleted. When using Japan time, it is as follows. That is, it means that the next arrival (in the 24-hour system of Japan time) 08:59:59 is deleted from the time indicated by the reference start time included in the additional identification information.
As described above, the values used are the same between the above-mentioned NTP-LI and the above-mentioned reference start time LI. However, even if the relationship between the value and its meaning is different between NTP-LI and the reference start time LI, no essential inconvenience occurs.

Next, regarding the adjustment of leap seconds in the presentation of subtitles and the like, the procedure of operation on the receiving device 1 side will be described. In addition to subtitles, the same applies to character supermarkets when referring to "subtitles, etc." Further, the operation procedure of the receiving device 1 described here is when the TMD (time control mode) in the above-mentioned additional identification information represents "TTML description (reference start time starting point)" (that is, the additional identification information is the reference start time). And the reference start time LI).

6 and 7 are flowcharts showing the operation procedure of the receiving device 1 regarding the adjustment of the leap second in the presentation of the subtitles and the like. Note that FIGS. 6 and 7 are connected by a combiner in the flowchart, and both of these figures show a series of processing procedures. As a premise of the processing, "1" or "2" is displayed as the value of NTP-LI from about 24 hours before the leap second is executed. Further, the value of the leap second indicator (item (5) in the description of the additional identification information) in the additional identification information is also changed basically in synchronization with the value of NTP-LI.

The leap second adjustment unit 52 describes the flowcharts shown in both figures for each relative time (relative time indicating the timing of the start or end of presentation of the subtitles) specified in the TTML document storing the subtitles and the like. Perform processing. Hereinafter, the description will be given according to this flowchart.

First, in step S101 of FIG. 6, the leap second adjustment unit 52 sets T1 as the time obtained by adding the reference start time and the relative time (the relative time specified as the presentation start time or the presentation end time of the subtitles or the like). .. Note that T1 is a variable or storage area for temporarily storing the time. When adding the time in this step, the addition is performed on the premise that 1 minute = 60 seconds, instead of adding in consideration of the leap second to be executed. That is, assuming that there is no leap second, the reference start time and the relative time are added.

Next, in step S102, the leap second adjusting unit 52 sets the time one second before T1 to T2. Further, the time 1 second after T1 is defined as T3. The T2 and T3 are also variables or storage areas similar to the above T1. These T2 and T3 are times used as a reference for the presentation operation (presentation start (@begin) or presentation end (@end)) of subtitles and the like when adjusting the deviation of the presentation timing in a later step.

Next, in step S103, the leap second adjustment unit 52 sets the value of the leap second identifier (reference_start_time_leap_indicator, RST-LI) of the reference start time of the TTML document currently being processed as LI1. LI1 is a variable or a storage area for storing the value of RST-LI.

Next, in step S104, the leap second adjustment unit 52 sets the time in the receiving device to T0. This T0 is also a variable or storage area for temporarily storing the time. The time in the receiving device is a time that is managed by the time management unit 32 in the receiving device and is progressing.

Next, in step S105, the leap second adjustment unit 52 uses the leap second indicator (leap_indicator) in the additional identification information stored in the latest (that is, the last received) MH-data coded communication method descriptor. Let the value be LI2. This leap second indicator is item (5) in the description of the additional identification information. That is, although there is a slight delay as described above, the value of NTP-LI at almost the present time is set to LI2. This LI2 is also a variable or storage area for storing a value.

Moving on to FIG. 7, then in step S106, the leap second adjusting unit 52 branches the process according to the value of LI1 (that is, RST-LI). LI1 can take three values of 0, 1, and 2. When the value of LI1 is 2 (when the seconds are deleted within 24 hours after the reference start time), the leap second adjustment unit 52 transfers control to step S107. When the value of LI1 is 1 (when the second is inserted within 24 hours after the reference start time), the leap second adjustment unit 52 transfers control to step S109. When the value of LI1 is 0 (when there is no insertion or deletion of seconds within 24 hours after the reference start time), the leap second adjustment unit 52 transfers control to step S111.

When the process proceeds to step S107, the leap second adjustment unit 52 branches the process according to the value of the LI2 (that is, the LI corresponding to the current time) in the same step. Since LI1 = 2, the value of LI2 can only be either 0 or 2 in this situation. When the value of LI2 is 0, the leap second adjustment unit 52 shifts control to step S108. When the value of LI2 is 2, the leap second adjustment unit 52 shifts control to step S111.

When moving to step S108, the leap second adjustment unit 52 compares the time that is the reference of the presentation operation with the current time in the same step. Control is transferred to this step only when LI1 = 2 and LI2 = 0. That is, the reference start time is before the leap second is executed (before the second is deleted), and at the present time, it is already after the leap second is executed (after the second is deleted). Therefore, the time to be used as the reference for the presentation operation is T3 (that is, 1 second after T1). Therefore, in this step, the leap second adjustment unit 52 determines whether or not T3 = T0. When T3 = T0 (step S108: YES), the present time is the timing at which the presentation operation (start or end of presentation of subtitles or the like) should be executed, so the process proceeds to step S112. If T3 = T0 (step S108: NO), the timing (T3) for executing the presentation operation has not yet arrived, so the process returns to step S104.
However, in the process of returning the control to step S104, the time in the receiving device is updated in seconds. In other words, the leap second adjustment unit 52 waits to start the process of step S104 to be executed next until the seconds in the time in the receiving device are updated.

When moving from step S106 to step S109, the leap second adjustment unit 52 branches the process according to the value of the LI2 (that is, the LI corresponding to the present time) in the same step. Since LI1 = 1, the value of LI2 can only be either 0 or 1 in this situation. When the value of LI2 is 0, the leap second adjustment unit 52 shifts control to step S110. When the value of LI2 is 1, the leap second adjustment unit 52 shifts control to step S111.

When moving to step S110, the leap second adjustment unit 52 compares the time that is the reference of the presentation operation with the current time in the same step. Control is transferred to this step only when LI1 = 1 and LI2 = 0. That is, the reference start time is before the leap second is executed (before the second is inserted), and at the present time, it is already after the leap second is executed (after the second is inserted). Therefore, the time to be used as the reference for the presentation operation is T2 (that is, one second before T1). Therefore, in this step, the leap second adjustment unit 52 determines whether or not T2 = T0. When T2 = T0 (step S110: YES), the present time is the timing at which the presentation operation (start or end of presentation of subtitles or the like) should be executed, so the process proceeds to step S112. If T2 = T0 (step S110: NO), the timing (T2) for executing the presentation operation has not yet arrived, so the process returns to step S104.
However, in the process of returning the control to step S104, the time in the receiving device is updated in seconds. In other words, the leap second adjustment unit 52 waits to start the process of step S104 to be executed next until the seconds in the time in the receiving device are updated.

When moving to step S111 (from any of steps S106, S107, and S109), the leap second adjustment unit 52 compares the reference time of the presentation operation with the current time in this step. In any case where control is transferred to this step, there is no deviation in the presentation time due to leap seconds. Therefore, the time to be used as the reference for the presentation operation is T1. Therefore, in this step, the leap second adjustment unit 52 determines whether or not T1 = T0. When T1 = T0 (step S111: YES), the present time is the timing at which the presentation operation (start or end of presentation of subtitles or the like) should be executed, so the process proceeds to step S112. When T1 = T0 is not (step S111: NO), the timing (T1) for executing the presentation operation has not yet arrived, so the process returns to step S104.
However, in the process of returning the control to step S104, the time in the receiving device is updated in seconds. In other words, the leap second adjustment unit 52 waits to start the process of step S104 to be executed next until the seconds in the time in the receiving device are updated.

When moving to step S112 (from any of steps S108, S110, and S111), the leap second adjustment unit 52 sets the time as the operating time in this step. Here, "set as an operation time" means an operation of starting presentation of subtitles or the like (when presentation start (@begin) is specified as a relative time) or an operation of ending presentation of subtitles or the like (presentation end as a relative time). (When (@end) is specified) is executed. When the leap second adjusting unit 52 performs such control, the presenting unit 51 executes a designated operation (presentation start or presentation end) at the timing when the leap second adjustment is performed. After executing the process of step S112, the leap second adjustment unit 52 ends the process of the entire flowchart.

As is clear from the above processing procedure, when the value of the leap second indicator (LI1 and LI2) is 1 or 2, the target time is a predetermined length of time (24 hours) before the leap second is executed. ) Indicates that it is inside. Further, when the value of the leap second indicator is 0, it indicates that the target time is not within a predetermined length of time (24 hours) before the leap second is executed. Then, when this leap second indicator indicates that both LI1 and LI2 are within a predetermined length of time before the leap second is executed, whether the leap second is insertion or deletion of seconds. Is also shown. That is, the value 1 corresponds to the insertion of seconds and the value 2 corresponds to the deletion of seconds.

The processing by the leap second adjustment unit 52 described using the flowchart is as follows.

(1) The leap second adjustment unit 52 indicates that the reference start time leap second indicator (LI1) is within a predetermined length of time before the leap second is executed, and the leap second is the insertion of a second. When it indicates that (LI1 = 1) and the current time leap second indicator (LI2) is not within a predetermined length of time before the leap second is executed (LI2 = 0). , At the timing when the time in the receiving device (T0) arrives at the time (T2) one second before the time (T1) obtained by adding the reference start time and the relative time assuming that there is no leap second, the relative time is set. The presentation unit 51 adjusts to start or end the corresponding presentation. This corresponds to the process following steps S110 to S112.

(2) The leap second adjustment unit 52 indicates that the reference start time leap second indicator (LI1) is within a predetermined length of time before the leap second is executed, and the leap second is deleted. When (LI1 = 2) indicates that the current time leap second indicator (LI2) is not within a predetermined length of time before the leap second is executed (LI2 = 0). , At the timing when the time in the receiving device (T0) arrives at the time (T3) one second after the time (T1) obtained by adding the reference start time and the relative time assuming that there is no leap second, the relative time is set. The presenting unit adjusts to start or end the corresponding presentation. This corresponds to the process following steps S108 to S112.

(3) If the leap second adjustment unit 52 is neither (1) nor (2) above, it receives at the time (T1) in which the reference start time and the relative time are added assuming that there is no leap second. At the timing when the in-device time (T0) is reached, the presentation unit adjusts to start or end the presentation corresponding to the relative time. This corresponds to the process continuing from step S108 to S111 described above.

As described above, according to the present embodiment, it is possible to correct the deviation of the presentation time due to the leap second and to start / end the presentation of the subtitles and the like at the correct timing.

[Second Embodiment]
Next, the second embodiment will be described. The main difference between this embodiment and the first embodiment is how to synchronize the time in the receiving device with the NTP time when the leap second is implemented. The receiving device in the present embodiment does not synchronize with the NTP time immediately after the leap second is executed. This is to avoid a problem that the pace of the step of the time in the receiving device managed internally is disturbed by the implementation of the leap second (seconds are inserted or seconds are deleted) as an implementation of the receiving device. This is the case when various device configurations are made.
In the following, the same functional blocks as those in the above-described embodiment may be designated by the same reference numerals and detailed description thereof may be omitted. In the following, the matters peculiar to the present embodiment will be mainly described.

FIG. 8 is a block diagram showing a schematic functional configuration of the receiving device according to the present embodiment. The receiving device 8 is a television receiver for receiving television broadcasts and the like. As shown in the figure, the receiving device 8 includes a receiving unit 11, a channel selection unit 12, a demodulation unit 14, a separation unit 15, a video decoding unit 21, an audio decoding unit 22, a character super processing unit 23, and subtitles. The processing unit 24, the time information reception processing unit 31, the time management unit 33 in the receiving device, the presentation unit 51, and the leap second adjustment unit 53 are included. That is, the receiving device 8 includes a time management unit 33 in the receiving device instead of the time management unit 32 in the receiving device in the first embodiment, and a leap second adjusting unit in place of the leap second adjusting unit 52 in the first embodiment. 53 is provided. The leap second adjustment unit 53 may exist outside the presentation unit 51.
The functional configuration on the transmitter side in this embodiment is the same as that in the first embodiment.

The time management unit 33 in the receiving device manages the clock in the receiving device. The time management unit 33 in the receiving device has substantially the same function as the time management unit 32 in the receiving device in the previous embodiment, but the timing for synchronizing the time in the receiving device with the NTP time is different. The time management unit 33 in the receiving device supplies the information of the time in the receiving device to the presenting unit 51.

The time management unit 33 in the receiving device in the present embodiment uses the above NTP time only when there is a tuning operation in the receiving device 8 or when the power is turned on / off, and only in those cases. Correct the clock in the receiver. These operations are performed by, for example, a remote control signal from a remote control device. That is, in the present embodiment, the clock in the receiving device is deviated from the NTP time when the seconds are inserted or deleted, but the time management unit 33 in the receiving device does not necessarily immediately enter the receiving device. The process of setting the clock to the NTP time is not performed.
One of the reasons is that the clock in the receiving device is used for various controls in the receiving device 8, and in the control, the seconds are stopped (inserted in seconds) as the value of the clock in the receiving device. This is to avoid flying (delete seconds). Since various operations and processes in the receiving device 8 are initialized when there is a tuning operation or a power on / off operation, there is little adverse effect due to the pace of progress of the clock in the receiving device being disturbed.

In the first embodiment, the time in the receiving device is always synchronized with the NTP time. However, in the present embodiment, after the leap second is executed and before the process of adjusting the time in the receiving device to the NTP time (synchronous processing) is performed, the time in the receiving device and the NTP time (current time) are set. There will be a gap between them. Specifically, after the seconds have been inserted and before the correction for adjusting the time in the receiving device to the NTP time is performed, the time in the receiving device is one second ahead of the NTP time. Further, after the seconds are deleted and before the correction for adjusting the time in the receiving device to the NTP time is performed, the time in the receiving device is delayed by 1 second from the NTP time. In the case of neither of the above two cases, the time in the receiving device matches the NTP time.

That is, in the present embodiment, in addition to the correction by the leap second adjustment unit performed in the first embodiment, the correction for the deviation that may occur between the time in the receiving device and the NTP time is superimposed. Take control.

The time management unit 33 in the receiving device always keeps track of whether or not the time in the receiving device of the own device is synchronized with the NTP time. Further, when the time in the receiving device of the own device is not synchronized with the NTP time, the time management unit 33 in the receiving device delays whether the time in the receiving device of the own device is ahead of or behind the NTP time. I know if there is. The fact that the time in the receiving device precedes the NTP time means that the time in the receiving device> the NTP time (the larger the value is, the later in time), and such a situation occurs. , At least immediately after the insertion of seconds by leap seconds. On the contrary, the fact that the time in the receiving device is behind the NTP time is expressed by using an inequality sign, that is, the time in the receiving device <NTP time, and such a situation is the deletion of seconds by at least leap seconds. It happens immediately after the leap second is done.
The time management unit 33 in the receiving device notifies the leap second adjustment unit 53 of the time synchronization state at a required timing.

The time management unit 33 in the receiving device can grasp the time synchronization state of the time in the receiving device by comparing the NTP time information supplied from the time information receiving processing unit 31 with the time in the receiving device. .. Alternatively, the time management unit 33 in the receiving device synchronizes the time in the receiving device with the NTP time after the value of NTP-LI supplied from the time information receiving processing unit 31 changes from 1 to 0 or 2 to 0. The time synchronization state can be grasped by memorizing whether or not the process of causing the time is performed.

That is, the time management unit 33 in the receiving device operates based on a predetermined operation signal (change of reception frequency (service) based on the channel selection operation signal, on / off of the power supply based on the power supply operation signal, etc.). Is managed so that the time in the receiving device is synchronized with the NTP time (standard time) only at the timing performed by the receiving device 8, and whether the time in the receiving device is synchronized with the NTP time or the time in the receiving device is The quiet second adjustment unit 53 is notified of information indicating whether the time is ahead of the NTP time or the time in the receiving device is behind the NTP time.

The leap second adjusting unit 53 is provided for the same purpose as the leap second adjusting unit 52 in the first embodiment. That is, the leap second adjustment unit 53 adjusts the leap second in controlling the timing of starting and ending the presentation of the subtitles and the like with respect to the presentation of the character supermarket and the subtitles. Then, the leap second adjustment unit 53 instructs the presentation unit 51 of the timing corrected by this adjustment.

As described above, the purpose of the function performed by the leap second adjusting unit 53 is the same as that of the leap second adjusting unit 52 in the first embodiment. However, as described above, since the time management unit 33 in the receiving device in the present embodiment manages the time in the receiving device by an original method, the leap second adjusting unit 53 also manages the time in the receiving device peculiar to the present embodiment. The above logic is used to correct the presentation timing of subtitles and the like. The details of the processing procedure by the leap second adjusting unit 53 will be described in detail later with reference to the flowchart.

Next, the procedure of the operation related to the adjustment of the leap second in the presentation of the subtitles and the like in the receiving device 8 will be described. In addition to subtitles, the same applies to character supermarkets when referring to "subtitles, etc." Further, the operation procedure of the receiving device 8 described here is a case where the TMD (time control mode) in the above-mentioned additional identification information represents "TTML description (reference start time starting point)".

9 and 10 are flowcharts showing the operation procedure of the receiving device 8 regarding the adjustment of leap seconds in the presentation of subtitles and the like. Note that FIGS. 9 and 10 are connected by a combiner in the flowchart, and both of these figures show a series of processing procedures. As a premise of the processing, "1" or "2" is displayed as the value of NTP-LI from about 24 hours before the leap second is executed. Further, the value of the leap second indicator (item (5) in the description of the additional identification information) in the additional identification information is also changed basically in synchronization with the value of NTP-LI.

The leap second adjustment unit 53 describes the flowcharts shown in both figures for each relative time (relative time indicating the timing of the start or end of presentation of the subtitles) specified in the TTML document storing the subtitles and the like. Perform processing. Hereinafter, the description will be given according to this flowchart.

First, in step S201 of FIG. 9, the leap second adjustment unit 53 sets T1 as the time obtained by adding the reference start time and the relative time (the relative time specified as the presentation start time or the presentation end time of the subtitles or the like). .. The processing of this step is the same as that of step S101 in FIG.

Next, in step S202, the leap second adjustment unit 53 sets the time one second before T1 to T2. Further, the time 1 second after T1 is defined as T3. The processing of this step is the same as that of step S102 in FIG.

Next, in step S203, the leap second adjustment unit 53 sets the value of the leap second identifier (reference_start_time_leap_indicator, RST-LI) of the reference start time of the TTML document currently being processed as LI1. The processing of this step is the same as that of step S103 in FIG.

Next, in step S204, the leap second adjustment unit 53 grasps the synchronization state of the time in the receiving device managed by the time management unit 33 in the receiving device with the NTP time, and sets that state as S. Here, S is a variable or a storage means for temporarily storing one of the following three states. There are three types of time synchronization status of the time in the receiving device: (a) synchronous, (b) asynchronous (time in the receiving device precedes the NTP time), and (c) asynchronous (time in the receiving device is behind the NTP time). be. For convenience, the state of (b) may be simply referred to as "preceding", and the state of (c) may be simply referred to as "delaying".

Next, in step S205, the leap second adjustment unit 53 sets the time in the receiving device to T0. The processing of this step is the same as that of step S104 in FIG.

Next, in step S206, the leap second adjustment unit 53 uses the leap second indicator (leap_indicator) value in the additional identification information stored in the latest (that is, the last received) MH-data encoding method descriptor. Let LI2. This leap second indicator is the item (5) in the additional identification information described in the first embodiment. The processing of this step is the same as that of step S105 in FIG.

Moving on to FIG. 10, then in step S207, the leap second adjusting unit 53 branches the process according to the value of LI1 (that is, RST-LI). LI1 can take three values of 0, 1, and 2. When the value of LI1 is 2 (when the seconds are deleted within 24 hours after the reference start time), the leap second adjustment unit 53 transfers control to step S208. When the value of LI1 is 1 (when the second is inserted within 24 hours after the reference start time), the leap second adjustment unit 53 transfers control to step S211. When the value of LI1 is 0 (when there is no insertion or deletion of seconds within 24 hours after the reference start time), the leap second adjustment unit 53 transfers control to step S214.

When moving to step S208 (from step S207), the leap second adjustment unit 53 branches the process according to the value of the LI2 (that is, the LI corresponding to the current time) in the same step. Since LI1 = 2, the value of LI2 can only be either 0 or 2 in this situation. When the value of LI2 is 0, the leap second adjustment unit 53 shifts control to step S209. When the value of LI2 is 2, the leap second adjustment unit 53 shifts control to step S215.

When the process proceeds to step S209, the leap second adjustment unit 53 branches the process according to the value of S (that is, the time synchronization state of the time in the receiving device) in the same step. Control is transferred to this step only when LI1 = 2 and LI2 = 0. That is, the reference start time is before the leap second is executed (before the second is deleted), and at the present time, it is already after the leap second is executed (after the second is deleted). Therefore, the state indicated by S at that time can only be synchronous or asynchronous (time in the receiving device is delayed). When S is "synchronous", the leap second adjustment unit 53 transfers control to step S210. When S is "asynchronous (time in the receiving device is delayed)", the leap second adjustment unit 53 shifts control to step S215.
In this step, S is in the "synchronous" state after the leap second has already been executed (after the seconds have been deleted) and after the time in the receiving device has been synchronized with the NTP time after the seconds have been deleted. be.
Further, in this step, S is in the "asynchronous (time in the receiving device is delayed)" state already after the leap second is executed (after the seconds are deleted), and the time in the receiving device is still after the seconds are deleted. Is not synchronized with the NTP time.

When moving to step S211 (from step S207), the leap second adjustment unit 53 branches the process according to the value of the LI2 (that is, the LI corresponding to the current time) in the same step. Since LI1 = 1, the value of LI2 can only be either 0 or 1 in this situation. When the value of LI2 is 0, the leap second adjustment unit 53 shifts control to step S212. When the value of LI2 is 1, the leap second adjustment unit 53 shifts control to step S215.

When moving to step S212, the leap second adjustment unit 53 branches the process according to the value of S in the same step. Control is transferred to this step only when LI1 = 1 and LI2 = 0. That is, the reference start time is before the leap second is executed (before the second is inserted), and at the present time, it is already after the leap second is executed (after the second is inserted). Therefore, the state indicated by S at that time can only be synchronous or asynchronous (time in the receiving device precedes). When S is "synchronous", the leap second adjustment unit 53 transfers control to step S213. When S is "asynchronous (time in the receiving device precedes)", the leap second adjustment unit 53 shifts control to step S215.
In this step, S is in the "synchronous" state after the leap second has already been executed (after the seconds have been inserted) and after the time in the receiving device has been synchronized with the NTP time after the seconds have been inserted. be.
Further, in this step, S is in the "asynchronous (time in the receiving device precedes)" state already after the leap second is executed (after the seconds are inserted), and the time in the receiving device is still after the insertion of the seconds. Is not synchronized with the NTP time.

When moving to step S214 (from step S207), the leap second adjustment unit 53 branches the process according to the value of S in the same step. The state indicated by S at this time may be any of synchronous, asynchronous (time in the receiving device precedes), and asynchronous (time in the receiving device is delayed).
When S is "synchronous", the leap second adjustment unit 53 transfers control to step S215. When S is "asynchronous (time in the receiving device precedes)", the leap second adjustment unit 53 shifts control to step S210. When S is "asynchronous (time in the receiving device is delayed)", the leap second adjustment unit 53 shifts control to step S213.
In this step, S is in the "synchronous" state when the time in the receiving device is synchronized with the NTP time regardless of whether or not the leap second has been executed recently. Further, in this step, S is in the "asynchronous (time in the receiving device precedes)" state already after the leap second is executed (after the seconds are inserted), and the time in the receiving device is still after the insertion of the seconds. Is not synchronized with the NTP time. Further, in this step, S is in the "asynchronous (time in the receiving device precedes)" state already after the leap second is executed (after the seconds are inserted), and the time in the receiving device is still after the insertion of the seconds. Is not synchronized with the NTP time.

By the processing up to this point in the flowchart, the time (any of T1, T2, and T3) that should be used as a reference in controlling the timing of the presentation operation (presentation start or presentation end) of subtitles and the like is determined. In the following processing, each case will be described with reference to each of T1, T2, and T3.

When moving to step S210 (from step S209 or S214), the leap second adjustment unit 53 compares the reference time of the presentation operation with the current time in the same step. When control is transferred to this step, the time to be used as the reference for the presentation operation is T3 (that is, 1 second after T1). Therefore, in this step, the leap second adjustment unit 53 determines whether or not T3 = T0. When T3 = T0 (step S210: YES), the present time is the timing at which the presentation operation (start or end of presentation of subtitles or the like) should be executed, so the process proceeds to step S216. If T3 = T0 (step S210: NO), the timing (T3) for executing the presentation operation has not yet arrived, so the process returns to step S204.
However, in the process of returning the control to step S204, the time in the receiving device is updated in seconds. In other words, the leap second adjustment unit 53 waits for the process of step S204 to be executed next to be started until the seconds in the time in the receiving device are updated.

When moving to step S213 (from step S212 or S214), the leap second adjustment unit 53 compares the reference time of the presentation operation with the current time in the same step. When control is transferred to this step, the time to be used as the reference for the presentation operation is T2 (that is, one second before T1). Therefore, in this step, the leap second adjustment unit 53 determines whether or not T2 = T0. When T2 = T0 (step S213: YES), the present time is the timing at which the presentation operation (start or end of presentation of subtitles or the like) should be executed, so the process proceeds to step S216. If T2 = T0 (step S213: NO), the timing (T2) for executing the presentation operation has not yet arrived, so the process returns to step S204.
However, in the process of returning the control to step S204, the time in the receiving device is updated in seconds. In other words, the leap second adjustment unit 53 waits for the process of step S204 to be executed next to be started until the seconds in the time in the receiving device are updated.

When moving to step S215 (from any of steps S208, S209, S211, S212, and S214), the leap second adjustment unit 53 compares the time that is the reference of the presentation operation with the current time in the same step. When control is transferred to this step, the time to be used as the reference for the presentation operation is T1. Therefore, in this step, the leap second adjustment unit 53 determines whether or not T1 = T0. When T1 = T0 (step S215: YES), the present time is the timing at which the presentation operation (start or end of presentation of subtitles or the like) should be executed, so the process proceeds to step S216. When T1 = T0 is not (step S215: NO), the timing (T1) for executing the presentation operation has not yet arrived, so the process returns to step S204.
However, in the process of returning the control to step S204, the time in the receiving device is updated in seconds. In other words, the leap second adjustment unit 53 waits for the process of step S204 to be executed next to be started until the seconds in the time in the receiving device are updated.

As a result of the determination described so far, when the process proceeds to step S216 (from any of steps S210, S213, and S215), the leap second adjustment unit 53 sets the time as the operation time in the same step. Here, "set as an operation time" means an operation of starting presentation of subtitles or the like (when presentation start (@begin) is specified as a relative time) or an operation of ending presentation of subtitles or the like (presentation end as a relative time). (When (@end) is specified) is executed. When the leap second adjusting unit 53 performs such control, the presenting unit 51 executes a designated operation (presentation start or presentation end) at the timing when the leap second adjustment is performed. After executing the process of step S216, the leap second adjustment unit 53 ends the process of the entire flowchart.

The processing by the leap second adjustment unit 53 described using the flowchart is as follows.

(1a) Reference start time Indicates that the leap second indicator is within a predetermined length of time before the leap second is executed, and that the leap second is an insertion of seconds (LI1 = 1). It indicates that the current time leap second indicator is not within the predetermined length of time before the leap second is executed (LI2 = 0), and the time in the receiving device is synchronized with the standard time. When a notification indicating (S = synchronization) is received from the time management unit 33 in the receiving device.
(1b) Reference start time Indicates that the leap second indicator is not within a predetermined length of time before the leap second is executed (LI1 = 0), and the time in the receiving device is behind the standard time. When a notification indicating (S = delay) is received from the time management unit 33 in the receiving device.
(1) In the case of either (1a) or (1b) above, the leap second adjusting unit 53 is more than the time (T1) obtained by adding the reference start time and the relative time assuming that there is no leap second. At the timing when the time in the receiving device (T0) arrives at the time (T2) one second before, the presentation unit 51 adjusts to start or end the presentation corresponding to the relative time. This corresponds to the process following steps S213 to S216.

(2a) Reference start time Indicates that the leap second indicator is within a predetermined length of time before the leap second is executed, and indicates that the leap second is a deletion of seconds (LI1 = 2). It indicates that the current time leap second indicator is not within the predetermined length of time before the leap second is executed (LI2 = 0), and the time in the receiving device is synchronized with the standard time. When a notification indicating (S = synchronization) is received from the time management unit 33 in the receiving device.
(2b) Reference start time Indicates that the leap second indicator is not within a predetermined length of time before the leap second is executed (LI1 = 0), and the time in the receiving device is ahead of the standard time. When a notification indicating that there is (S = preceding) is received from the time management unit 33 in the receiving device.
(2) In the case of either (2a) or (2b) above, the leap second adjusting unit 53 is more than the time (T1) obtained by adding the reference start time and the relative time assuming that there is no leap second. At the timing when the time in the receiving device (T0) arrives at the time (T3) one second later, the presentation unit 51 adjusts to start or end the presentation corresponding to the relative time. This corresponds to the process following steps S210 to S216.

(3) If the leap second adjustment unit 53 is neither (1) nor (2) above, the leap second adjustment unit 53 receives the reference start time and the relative time at the time (T1) added assuming that there is no leap second. At the timing when the in-device time (T0) is reached, the presentation unit 51 adjusts to start or end the presentation corresponding to the relative time. This corresponds to the process following steps S215 to S216.

In the operating procedure shown in FIGS. 9 and 10, when considering the implementation of leap seconds, the timing of the presentation start and presentation specified using the relative time in the TTML document has arrived or is not yet. It was to judge whether it had arrived. The case classification in this judgment will be supplementarily explained here.

FIG. 11 shows which time in the receiving device 8 depending on the value of LI1 (that is, RST-LI), the value of LI2 (that is, the LI corresponding to the latest time), and the value of S (time synchronization state). It is a schematic diagram which showed whether it should be used as a reference. In the figure, each row corresponds to a combination of a value of LI1 and a value of LI2. Also, each column corresponds to a value of S. Of the three columns according to the value of S, the first column (leftmost) is when S (synchronization state of the time in the receiving device) is in the state of "the time in the receiving device is synchronized with the NTP time". Is. The second column (center) is a case where S (synchronization state of the time in the receiving device) is "the time in the receiving device is not synchronized with the NTP time and precedes the NTP time". be. Further, the third column (leftmost) is a case where S (synchronization state of the time in the receiving device) is a state in which "the time in the receiving device is not synchronized with the NTP time and is behind the NTP time". be.

In the figure, the column where each row and each column intersect indicates the time (either T1, T2, or T3) that should be used as a reference in that case.
As shown, when T1 should be used, it is listed below (C1) to (C7).
(C1) LI1 = 0, LI2 = 0, S = "Synchronization"
(C2) LI1 = 0, LI2 = 1, S = "Synchronization"
(C3) LI1 = 0, LI2 = 2, S = "Synchronization"
(C4) LI1 = 1, LI2 = 0, S = "Time in the receiving device precedes" (C5) LI1 = 1, LI2 = 1, S = "Synchronization"
(C6) LI1 = 2, LI2 = 0, S = "Time in the receiving device is delayed" (C7) LI1 = 2, LI2 = 2, S = "Synchronization"
When T2 should be used, it is listed below (C8) and (C9).
(C8) LI1 = 0, LI2 = 0, S = "Time in receiver is delayed" (C9) LI1 = 1, LI2 = 0, S = "Synchronization"
When T3 should be used, it is listed below (C10) and (C11).
(C10) LI1 = 0, LI2 = 0, S = "Time in the receiving device precedes" (C11) LI1 = 2, LI2 = 0, S = "Synchronization"

It should be noted that it is not necessary to consider it because it cannot occur except for the nine cases (C1) to (C11) mentioned above. In the column where such consideration is unnecessary, "d / c" is described.

As described above, according to the present embodiment, it is possible to correct the deviation of the presentation time due to the leap second and to start / end the presentation of the subtitles and the like at the correct timing.

[Modification example, etc.]
Hereinafter, modifications common to the first embodiment and the second embodiment, technical points to be noted, and the like will be described.
In the first embodiment and the second embodiment, the configuration corresponds to two forms of leap seconds (insertion and deletion of seconds). This may be transformed into a configuration corresponding only to the insertion of seconds. This variant is based on the assumption that as leap seconds, only seconds are inserted and seconds are not deleted.
In the first embodiment and the second embodiment, the leap second adjustment unit (52, 53) is provided inside the presentation unit 51, but it is provided outside the presentation unit 51 so as to realize the same function. Is also good.

The first embodiment and the second embodiment assume that there is no program that lasts for 24 hours or more. In other words, it is assumed that there is no single TTML document sent as subtitles for a program that lasts more than 24 hours. According to this assumption, the reference start time leap second indicator (RST-LI) corresponding to the reference start time of the TTML document, which is the subtitle of the program related to the leap second, is always 1 or 2. That is, even though leap seconds (inserting or deleting seconds) are scheduled to be performed, the value of the reference start time leap second indicator corresponding to the reference start time of a specific program may not be 0. .. Even if one program lasts for 24 hours or more, it is possible to maintain the above assumption by virtually dividing the program into a plurality of programs for the purpose of controlling the presentation time. Is.

In addition, it may be assumed that the leap second is performed at a sufficiently long interval. That is, leap seconds are carried out at most once every few tens of months. That is, the value of the current time leap second indicator is 0 for most periods. The same applies to the value of the reference start time leap second indicator. Therefore, a change in the value of the current time leap second indicator (change to a value of 1 or 2) that accompanies the implementation of the leap second on one day is the current time leap second indicator that accompanies the implementation of the leap second on the next opportunity. It does not interfere with the change in (change of value to 1 or 2).

In the first embodiment and the second embodiment, the description is made on the premise that the time difference between Coordinated Universal Time and Japan time is 9 hours (Japan time is more advanced). Even if the time difference between Coordinated Universal Time and local time is different, there is no need to change the technical configuration as long as the time difference is set correctly. In addition, even if different standard times (for example, so-called daylight saving time, Daylight Saving Time) are introduced depending on the season in a certain time zone, the time difference from Coordinated Universal Time can be set correctly. The configuration described in the embodiment can be used as it is.

Further, the means for the receiving device to receive the standard time information from the outside may be other than NTP. In that case, the receiving device receives the current standard time from the outside by communication other than NTP or by a broadcast signal or the like. Alternatively, the receiving device receives information for calculating the current standard time in the receiving device. However, even in that case, it is necessary that the received information is synchronized with the standard time including the leap second, and that the information corresponding to the leap second indicator is also received.

Further, in the first embodiment and the second embodiment, the receiving device receives and presents video and audio. However, the receiving device does not receive the video asset or the audio asset, receives only the timed text, and presents only the timed text (subtitles, etc.) while controlling the timing by the method described in each embodiment. You can do it.

In the first embodiment and the second embodiment, the reference start time leap second indicator is stored in a part of the additional identification information such as subtitles in the MH-data coding method descriptor. Since this descriptor is frequently sent from the broadcasting station side, it is suitable as an area for storing the reference start time leap second indicator. On the receiving device side, the leap second indicator can be received without delay.
Further, in the first embodiment and the second embodiment, the leap second indicator corresponding to the current time is stored in a part of the additional identification information such as subtitles in the MH-data coding method descriptor. .. As a result, on the receiving device side, both leap second indicators (LI1 and LI2) can be acquired simply by referring to this additional identification information.

In addition, at least a part of the functions of the receiving device and the transmitting device in the first embodiment or the second embodiment described above may be realized by a computer. In that case, the program for realizing the function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read by the computer system and executed. The term "computer system" as used herein includes hardware such as an OS and peripheral devices. Further, the "computer-readable recording medium" refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, or a CD-ROM, or a storage device such as a hard disk built in a computer system.
Further, a "computer-readable recording medium" is a communication line for transmitting a program via a network such as the Internet or a communication line such as a telephone line, and dynamically holds the program for a short period of time. It may also include a program that holds a program for a certain period of time, such as a volatile memory inside a computer system that serves as a server or a client in that case. Further, the above-mentioned program may be a program for realizing a part of the above-mentioned functions, and may be a program for realizing the above-mentioned functions in combination with a program already recorded in the computer system.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and includes designs and the like within a range that does not deviate from the gist of the present invention.

[Timing example]
Hereinafter, an example of the timing of subtitle presentation control when the receiving devices of the first embodiment and the second embodiment are used will be described.

FIG. 12 is a table showing the relationship between the NTP time, the time in the receiving device of each type of receiving device, and the variation regarding the RST-LI value of the subtitle document (TTML document) when the insertion of seconds is performed. It is a figure of.
In the figure, the receiving device (type 1) is the receiving device 1 of the first embodiment described above, and the time in the receiving device is synchronized with the NTP time. Further, the receiving device (type 2) is the receiving device 8 of the second embodiment described above, and even if the time in the receiving device deviates from the NTP time due to the insertion or deletion of seconds, the channel selection operation is performed. Alternatively, it is synchronized with the NTP time only when the power is turned on / off.

In the figure, the following items are provided for each digit of the table. That is, the 1st digit is the NTP time, the 2nd digit is LI2 (almost synchronized with NTP-LI), the 3rd digit is the time in the receiving device of the receiving device (type 1), and the 4th digit is the receiving device (type 2, selection). The time in the receiver of the receiver (type 2, the channel selection operation is performed before the operation of the quiet second) is in the 5th digit, and the time in the receiver (type 2) is in the 6th digit. 2. The time in the receiver of the receiver (the channel selection operation is performed after the quiet second), the relative time specified in the TTML document such that LI1 (that is, RST-LI) is 1 in the 7th digit, and the 8th digit. The time T1 corresponding to the relative time, the relative time specified in the TTML document such that LI1 (that is, RST-LI) is 0 in the 9th digit, and the time T1 corresponding to the relative time in the 10th digit.
Also, each line corresponds to a second. Then, a line number for reference is attached to the left side of the first column.

All times shown in the figure are in Japan time. Since this example is a case where seconds are inserted, "8:59:59" appears twice in the NTP time column (line numbers 10, 11). The value of LI2 (NTP-LI) is 1 before row 10, and the value of LI2 is 0 after row 11.

[1-1: Insertion of seconds, receiver (type 1)]
First, the combination of the receiving device (type 1) and the TTML document 1 (LI1 = 1) will be described.
In lines 6 to 10, the time in the receiving device and T1 of the TTML document 1 match. That is, during this period, the receiving device controls the presentation of subtitles and the like with reference to T1.
In lines 11 to 22, the time in the receiving device is one second ahead of T1 in the TTML document 1. That is, during this period, the receiving device controls the presentation of subtitles and the like with reference to T2.
Next, the combination of the receiving device (type 1) and the TTML document 2 (LI1 = 0) will be described.
In lines 17 to 22, the time in the receiving device and T1 of the TTML document 2 coincide with each other. That is, during this period, the receiving device controls the presentation of subtitles and the like with reference to T1.
As described above, the receiving device (type 1) operates correctly according to the operation procedure described in the first embodiment.

[1-2: Second insertion, receiver (type 2, no tuning operation)]
Next, the combination of the receiving device (type 2, no tuning operation) and the TTML document 1 (LI1 = 1) will be described.
In lines 6 to 22, the time in the receiving device and T1 of the TTML document 1 match. That is, during this period, the receiving device controls the presentation of subtitles and the like with reference to T1.
Next, the combination of the receiving device (type 2, no tuning operation) and the TTML document 2 (LI1 = 0) will be described.
In lines 17 to 22, the time in the receiving device is one second ahead of T1 in the TTML document 2. That is, during this period, the receiving device controls the presentation of subtitles and the like with reference to T3.
As described above, the receiving device (type 2, no tuning operation) operates correctly according to the operation procedure described in the second embodiment.

[1-3: Insertion of seconds, receiver (type 2, tuning operation before leap second)]
Next, the combination of the receiving device (type 2, with tuning operation before leap second) and TTML document 1 (LI1 = 1) will be described.
In lines 6 to 8, the time in the receiving device and T1 of the TTML document 1 match. That is, during this period, the receiving device controls the presentation of subtitles and the like with reference to T1.
In lines 10 to 22, the time in the receiving device and T1 of the TTML document 1 match. That is, during this period, the receiving device controls the presentation of subtitles and the like with reference to T1.
Next, the combination of the receiving device (type 2, with tuning operation before leap second) and TTML document 2 (LI1 = 0) will be described.
In lines 17 to 22, the time in the receiving device is one second ahead of T1 in the TTML document 2. That is, during this period, the receiving device controls the presentation of subtitles and the like with reference to T3.
As described above, the receiving device (type 2, with tuning operation before leap second) operates correctly according to the operation procedure described in the second embodiment.

[1-4: Insertion of seconds, receiver (type 2, tuning operation after leap second)]
Next, the combination of the receiving device (type 2, with tuning operation after leap second) and TTML document 1 (LI1 = 1) will be described.
In lines 6 to 18, the time in the receiving device and T1 of the TTML document 1 coincide with each other. That is, during this period, the receiving device controls the presentation of subtitles and the like with reference to T1.
In lines 20 to 22, the time in the receiving device is delayed by 1 second from T1 of the TTML document 1. That is, during this period, the receiving device controls the presentation of subtitles and the like with reference to T2.
Next, the combination of the receiving device (type 2, with tuning operation after leap second) and TTML document 2 (LI1 = 0) will be described.
In lines 17 to 18, the time in the receiving device is one second ahead of T1 in the TTML document 2. That is, during this period, the receiving device controls the presentation of subtitles and the like with reference to T3.
In lines 20 to 22, the time in the receiving device and T1 of the TTML document 2 coincide with each other. That is, during this period, the receiving device controls the presentation of subtitles and the like with reference to T1.
As described above, the receiving device (type 2, with tuning operation after leap second) operates correctly according to the operation procedure described in the second embodiment.

FIG. 13 is a table showing the relationship between the NTP time, the time in the receiving device of each type of receiving device, and the variation regarding the RST-LI value of the subtitle document (TTML document) when the seconds are deleted. It is a figure of. The difference is that FIG. 12 shows an example in the case of deleting seconds, whereas FIG. 12 shows an example in the case of deleting seconds. The items of the table shown in FIG. 13 are the same as those of FIG. 12, and the contents of the table shown in FIG. 13 are different from those of FIG.

All times shown in the figure are in Japan time. Since this example is a case where seconds are deleted, "8:59:59" does not appear even once in the NTP time column. Then, in the NTP time column, the line following "8:59:58" (line number 9) is "9:00:00" (line number 10). Then, the value of LI2 (NTP-LI) is 2 before the line 9, and the value of LI2 is 0 after the line 10.

[2-1: Delete seconds, receiver (type 1)]
First, the combination of the receiving device (type 1) and the TTML document 1 (LI1 = 2) will be described.
In lines 6 to 9, the time in the receiving device and T1 of the TTML document 1 match. That is, during this period, the receiving device controls the presentation of subtitles and the like with reference to T1.
In lines 10 to 22, the time in the receiving device is one second ahead of T1 in the TTML document 1. That is, during this period, the receiving device controls the presentation of subtitles and the like with reference to T3.
Next, the combination of the receiving device (type 1) and the TTML document 2 (LI1 = 0) will be described.
In lines 15 to 22, the time in the receiving device and T1 of the TTML document 2 coincide with each other. That is, during this period, the receiving device controls the presentation of subtitles and the like with reference to T1.
As described above, the receiving device (type 1) operates correctly according to the operation procedure described in the first embodiment.

[2-2: Delete seconds, receiver (type 2, no tuning operation)]
Next, the combination of the receiving device (type 2, no tuning operation) and the TTML document 1 (LI1 = 2) will be described.
In lines 6 to 22, the time in the receiving device and T1 of the TTML document 1 match. That is, during this period, the receiving device controls the presentation of subtitles and the like with reference to T1.
Next, the combination of the receiving device (type 2, no tuning operation) and the TTML document 2 (LI1 = 0) will be described.
From line 15 to line 22, the time in the receiving device is delayed by 1 second from T1 of the TTML document 2. That is, during this period, the receiving device controls the presentation of subtitles and the like with reference to T2.
As described above, the receiving device (type 2, no tuning operation) operates correctly according to the operation procedure described in the second embodiment.

[2-3: Delete seconds, receiver (type 2, tuning operation before leap second)]
Next, the combination of the receiving device (type 2, with tuning operation before leap second) and TTML document 1 (LI1 = 2) will be described.
In lines 6 to 7, the time in the receiving device and T1 of the TTML document 1 match. That is, during this period, the receiving device controls the presentation of subtitles and the like with reference to T1.
In lines 9 to 22, the time in the receiving device and T1 of the TTML document 1 coincide with each other. That is, during this period, the receiving device controls the presentation of subtitles and the like with reference to T1.
Next, the combination of the receiving device (type 2, with tuning operation before leap second) and TTML document 2 (LI1 = 0) will be described.
In lines 15 to 22, the time in the receiving device is one second ahead of T1 in the TTML document 2. That is, during this period, the receiving device controls the presentation of subtitles and the like with reference to T3.
As described above, the receiving device (type 2, with tuning operation before leap second) operates correctly according to the operation procedure described in the second embodiment.

[2-4: Delete seconds, receiver (type 2, with tuning operation after leap seconds)]
Next, the combination of the receiving device (type 2, with tuning operation after leap second) and TTML document 1 (LI1 = 2) will be described.
In lines 6 to 18, the time in the receiving device and T1 of the TTML document 1 coincide with each other. That is, during this period, the receiving device controls the presentation of subtitles and the like with reference to T1.
In lines 20 to 22, the time in the receiving device is one second ahead of T1 in the TTML document 1. That is, during this period, the receiving device controls the presentation of subtitles and the like with reference to T3.
Next, the combination of the receiving device (type 2, with tuning operation after leap second) and TTML document 2 (LI1 = 0) will be described.
In lines 15 to 18, the time in the receiving device is one second ahead of T1 in the TTML document 2. That is, during this period, the receiving device controls the presentation of subtitles and the like with reference to T3.
In lines 20 to 22, the time in the receiving device and T1 of the TTML document 2 coincide with each other. That is, during this period, the receiving device controls the presentation of subtitles and the like with reference to T1.
As described above, the receiving device (type 2, with tuning operation before leap second) operates correctly according to the operation procedure described in the second embodiment.

[Third Embodiment]
Next, the third embodiment will be described. The difference between the first embodiment and the second embodiment is that the leap second indicator corresponding to the current time is not included in the additional identification information of the subtitle / character super transmission method. Also in the present embodiment, as in the first embodiment and the second embodiment, the leap second indicator corresponding to the reference start time is included in the additional identification information of the subtitle / character super transmission method.
In the following, the same functional blocks as those in the above-described embodiment may be designated by the same reference numerals and detailed description thereof may be omitted. In the following, the matters peculiar to the present embodiment will be mainly described.

FIG. 14 is a block diagram showing a schematic functional configuration of the receiving device according to the present embodiment. The receiving device 9 is a television receiver for receiving television broadcasts and the like. As shown in the figure, the receiving device 9 includes a receiving unit 11, a channel selection unit 12, a demodulation unit 14, a separation unit 15, a video decoding unit 21, an audio decoding unit 22, a character super processing unit 23, and subtitles. The processing unit 24, the time information reception processing unit 31, the time management unit 34 in the receiving device, the presentation unit 51, and the leap second adjustment unit 54 are included. That is, the receiving device 9 includes a time management unit 34 in the receiving device instead of the time management unit 32 in the receiving device in the first embodiment, and a leap second adjusting unit in place of the leap second adjusting unit 52 in the first embodiment. 54 is provided. The leap second adjustment unit 54 may exist outside the presentation unit 51.
The functional configuration on the transmitter side in this embodiment is the same as that in the first embodiment. However, the transmission device 2 according to the present embodiment does not include the leap second indicator corresponding to the current time in the additional identification information related to the transmission of subtitles and the like. The transmission device 2 according to the present embodiment is the same as the first embodiment in that the leap second indicator corresponding to the current time is included in the NTP packet included in the broadcast signal. That is, the leap second display setting unit 72 in the present embodiment does not set the current time leap second indicator in the additional identification information. Then, the time information setting unit 71 in the present embodiment sets a leap second indicator (NTP-LI) in the NTP data.

The time management unit 34 in the receiving device has an internal clock in the receiving device to manage the time in the receiving device, and synchronizes the time in the receiving device with the standard time (NTP time) received from the outside at least at a predetermined timing. Let me. The clock in the receiving device normally advances based on a predetermined reference (clock signal or the like) in the receiving device. The time management unit 34 in the receiving device corrects the clock in the receiving device by using the NTP time notified from the time information receiving processing unit 31 at a predetermined timing. Further, the time management unit 34 in the receiving device supplies the information of the time in the receiving device to the presenting unit 51.
The time management unit 34 in the receiving device in the present embodiment corrects the clock in the receiving device using the above NTP time every second. That is, the time management unit 34 in the receiving device manages the time in the receiving device so as to always synchronize with the NTP time (standard time).

The time management unit 34 in the receiving device manages the leap second correction state in the receiving device, and notifies the leap second adjusting unit 54 of the leap second correction state at each time. The leap second correction state is set to S for convenience. The meanings of the values of S are the following six types a to f. However, in this embodiment, S = e and S = f are not possible. That is, the value that S can take in this embodiment is any one of the four values a to d.

S = a indicates that there is a leap second correction (leap seconds are performed) within 24 hours. This leap second is either an insert of a second or a delete of a second. The time management unit 34 in the receiving device knows whether or not the leap second is executed within 24 hours based on the value of the leap second indicator received by NTP. In other words, the leap second is executed from 24 hours before the timing when the leap second is implemented (almost 24 hours before, 00:00:00 Coordinated Universal Time; 09:00:00 Japan time). Until just before, the value of S is a. As described above, the information in the leap second correction state is information indicating whether or not the current standard time is within a predetermined length of time before the leap second is executed (that is, whether or not the value of S is a). Or) is included.

When S = b, it means that a leap second does not occur. Strictly speaking, the fact that S = b means that there is no leap second correction (implementation of leap seconds) within 24 hours, and that neither of the following S = c, d, e, and f states is present. Is shown. Since leap seconds are usually performed once every few tens of months, the value of S is b for most periods.

S = c indicates that the leap second (insertion of seconds or deletion of seconds) has been performed, and the leap second correction has been completed for the clock in the receiving device. However, when the following S = d, the value of S is not c. When a predetermined operation such as channel selection or power on / off is performed in the receiving device, the process returns from S = c to S = b.

When S = d, it means that the inserted second is the current time when the second is inserted by the leap second. Specifically, S = d when the leap second is implemented at 23:59:60 Coordinated Universal Time (08:59:60 in Japan time). However, in the time display by NTP and the time display of the clock in the receiving device, 23:59:59 in Coordinated Universal Time (08:59:59 in Japan time) continues for 2 seconds, but 1 second in the latter half. In, S = d. In other words, S = d when the second time is 23:59:59 in Coordinated Universal Time (in Japan time, 08:59:59 is displayed. See FIG. 19 later. However, a concrete example will be explained.

The fact that S = e indicates that the state is asynchronous (the clock in the receiving device advances (leads) with respect to the current time). That is, in this state, the clock in the receiving device is not yet synchronized with the current time after the leap second (insertion of seconds) is executed. In the present embodiment, since the clock in the receiving device is always synchronized with the current time, S = e does not occur as described above.

When S = f, it indicates that the state is asynchronous (the clock in the receiving device is behind the current time). That is, in this state, the clock in the receiving device is not yet synchronized with the current time after the leap second (delete of seconds) is executed. In the present embodiment, since the clock in the receiving device is always synchronized with the current time, S = f does not occur as described above.

The leap second adjustment unit 54 adjusts the presentation timing based on the leap second indicator (RST-LI) with respect to the reference start time and the value of the above state S. Next, the RST-LI in the present embodiment will be described with reference to FIG. Further, a specific procedure of the adjustment process by the leap second adjustment unit 54 will be described later with reference to FIG.

FIG. 15 is a schematic diagram showing a configuration of additional identification information for use in transmission of subtitles and character supermarkets in the present embodiment. This additional identification information is data stored in the MH-data coding method descriptor provided for each asset in the transmission by the MMT method. Basically, the MP table is transmitted from the transmitting device 2 in a cycle of 0.1 seconds.

The difference between the additional identification information shown in the figure and the configuration shown in FIG. 4 (first embodiment) is that the leap second indicator corresponding to the current time (in FIG. 4, the fifth line exists). leap_indicator) is not stored. As shown in FIG. 15, the additional identification information according to the present embodiment is a reserved area having a length of 3 bits at the location of the fifth line (a region that is not currently used and is reserved for future use. )including. The other data items shown in FIG. 15 and their meanings are the same as those shown in FIG. The additional identification information of the present embodiment has a data item reference_start_time_leap_indicator (reference start time leap second indicator, RST-LI) on the 19th line.

Next, the operation procedure of the receiving device 9 will be described.
FIG. 16 is a flowchart showing a procedure of operation of the receiving device 9 regarding the adjustment of leap seconds in the presentation of subtitles and the like. As a premise of the processing, "1" or "2" is displayed as the value of NTP-LI from about 24 hours before the leap second is executed. Then, the receiving device 9 acquires this information by NTP. In the figure, the operation of the receiving device 9 is shown as "TYPE 3" for convenience. The receiving device of this "TYPE 3" may be referred to as a "receiving device of assumed operation 1".

The leap second adjustment unit 54 describes the flowcharts shown in both figures for each relative time (relative time indicating the timing of the start or end of presentation of the subtitles) specified in the TTML document storing the subtitles and the like. Perform processing. Hereinafter, the description will be given according to this flowchart.

First, in step S301, the leap second adjustment unit 54 performs initial processing. The contents of the initial processing are as follows.
First, let T1 be the time indicated by the start time + relative time. That is, the leap second adjustment unit 54 has a reference start time (reference_start_time of additional identification information) and a relative time (relative time specified as a presentation start time (begin attribute) or presentation end time (end attribute) of subtitles and the like). Let T1 be the time obtained by adding and. Note that T1 is a variable or storage area for temporarily storing the time. When adding the time in this step, the addition is performed on the premise that 1 minute = 60 seconds, instead of adding in consideration of the leap second to be executed. That is, assuming that there is no leap second, the reference start time and the relative time are added.
Next, the leap second adjustment unit 54 sets the time one second before T1 to T2. Further, the time 1 second after T1 is defined as T3. The T2 and T3 are also variables or storage areas similar to the above T1. These T2 and T3 are times used as a reference for the presentation operation (presentation start (@begin) or presentation end (@end)) of subtitles and the like when adjusting the deviation of the presentation timing in a later step.
Then, the leap second adjustment unit 54 sets the value of the leap second indicator (refarence_start_time_leap_indicator, RST-LI in the additional identification information) corresponding to the reference start time as LI. The LI is a variable or a storage area for storing the value of RST-LI.

Next, in step S302, the leap second adjustment unit 54 acquires the current time and the leap second correction state from the time management unit 34 in the receiving device. Specifically, it is as follows.
First, the leap second adjustment unit 54 receives notification of the leap second correction state S from the time management unit 34 in the receiving device, and there are six values of S, a, b, c, d, e, and f. The meaning is as described above.
However, since the receiving device 9 of the present embodiment always synchronizes the clock managed internally with the current time, e and f are not taken as the values of S. In the receiving device 9 of the present embodiment, the value of S is always any of a, b, c, and d.
Next, the leap second adjustment unit 54 sets the current time in the receiving device to T0. This T0 is also a variable or storage area for temporarily storing the time. The time in the receiving device is a time that is managed by the time management unit 34 in the receiving device and is progressing.

Next, in step S303, the leap second adjustment unit 54 branches the process according to the LI value (that is, RST-LI). LI can take three values of 0, 1, and 2. When the value of LI is 2 (when the seconds are deleted within 24 hours after the reference start time), the leap second adjustment unit 54 transfers control to step S304. When the value of LI is 1 (when the second is inserted within 24 hours after the reference start time), the leap second adjustment unit 54 transfers control to step S306. If the LI value is 0 (no seconds are inserted or deleted within 24 hours after the reference start time), the leap second adjustment unit 54 transfers control to step S308.

Next, when the process proceeds to step S304, the leap second adjustment unit 54 branches the process according to the value of the leap second correction state S in the same step. When the value of S is a, the leap second adjustment unit 54 shifts control to step S308. If the value of S is either b or c, the leap second adjustment unit 54 transfers control to step S305. As described above, the value of S in this embodiment is any of a, b, c, and d, and e and f are not possible. Further, since the control is transferred to this step S304 when LI = 2 (indicating the deletion of seconds), d, which is in the state of inserting seconds, is also impossible.

Next, when the process proceeds to step S305, the leap second adjustment unit 54 makes a determination by comparing the times T3 and T0 in the same step. That is, the timing at which the presentation operation should be executed is T3. When T3 = T0 (step S305: YES), the leap second adjustment unit 54 shifts control to step S309 because it is the timing at which the presentation operation (start or end of presentation of subtitles or the like) should be executed. If T3 = T0 (step S305: NO), the timing (T3) for executing the presentation operation has not yet arrived, so the process returns to step S302.
However, in the process of returning the control to step S302, the time in the receiving device is updated in seconds. In other words, the leap second adjustment unit 54 waits for the process of step S302 to be executed next to be started until the seconds in the time in the receiving device are updated.

Next, when the process proceeds to step S306, the leap second adjustment unit 54 branches the process according to the value of the leap second correction state S in the same step. When the value of S is a, the leap second adjustment unit 54 shifts control to step S308. When the value of S is any of b, c, and d, the leap second adjustment unit 54 shifts control to step S307. As described above, the value of S in this embodiment is any of a, b, c, and d, and e and f are not possible.

Next, when the process proceeds to step S307, the leap second adjustment unit 54 makes a determination by comparing the times T2 and T0 in the same step. That is, the timing at which the presentation operation should be executed is T2. When T2 = T0 (step S307: YES), the leap second adjustment unit 54 shifts the control to step S309 because it is the timing at which the presentation operation (start or end of presentation of subtitles or the like) should be executed. When T2 = T0 (step S307: NO), the timing (T2) for executing the presentation operation has not yet arrived, so the process returns to step S302.
However, in the process of returning the control to step S302, the time in the receiving device is updated in seconds. In other words, the leap second adjustment unit 54 waits for the process of step S302 to be executed next to be started until the seconds in the time in the receiving device are updated.

When moving to step S308, in the same step, the leap second adjustment unit 54 makes a determination by comparing the times T1 and T0. That is, in this case, the timing at which the presentation operation should be executed is T1. When T1 = T0 (step S308: YES), the leap second adjustment unit 54 shifts the control to step S309 because it is the timing at which the presentation operation (start or end of presentation of subtitles or the like) should be executed. When T1 = T0 is not (step S308: NO), the timing (T1) for executing the presentation operation has not yet arrived, so the process returns to step S302.
However, in the process of returning the control to step S302, the time in the receiving device is updated in seconds. In other words, the leap second adjustment unit 54 waits for the process of step S302 to be executed next to be started until the seconds in the time in the receiving device are updated.

When moving to step S309 (from any of steps S305, S307, and S308), the leap second adjustment unit 54 sets the time as the operation time in this step. Here, "set as an operation time" means an operation of starting presentation of subtitles or the like (when presentation start (@begin) is specified as a relative time) or an operation of ending presentation of subtitles or the like (presentation end as a relative time). (When (@end) is specified) is executed. When the leap second adjusting unit 54 performs such control, the presenting unit 51 executes a designated operation (presentation start or presentation end) at the timing when the leap second adjustment is performed. After executing the process of step S309, the leap second adjustment unit 54 ends the process of the entire flowchart.

The processing by the leap second adjustment unit 54 described using the flowchart is as follows.

(1) Reference start time Indicates that the leap second indicator is within a predetermined length of time before the leap second is executed, and indicates that the leap second is an insertion of seconds, and ( 1a) Indicates that the leap second correction state notified from the time management unit in the receiving device is not within a predetermined length of time before the leap second is executed.
(1b) Time management in the receiving device (1c) Time management in the receiving device indicates that the leap second correction state notified from the time management unit in the receiving device is a state in which the leap second correction is completed with respect to the time in the receiving device. The leap second correction state notified by the unit indicates that the current time is the inserted second.
In the case of any of the above states (1a), (1b) or (1c) (S = b, c, d), the reference start time and the relative time are added assuming that there is no leap second. The leap second adjustment unit 54 adjusts so that the presentation unit starts or ends the presentation corresponding to the relative time at the timing when the time in the receiving device arrives at the time one second before (time T2). .. This corresponds to the processing of steps S307 and S309 described above.

(2) Reference start time Indicates that the leap second indicator is within a predetermined length of time before the leap second is executed, and indicates that the leap second is a deletion of seconds, and ( 2a) Indicates that the leap second correction state notified from the time management unit in the receiving device is not within a predetermined length of time before the leap second is executed.
(2b) The above (2a) or (2b) indicates that the leap second correction state notified from the time management unit in the receiving device is a state in which the leap second correction has been completed with respect to the time in the receiving device. In any of the states (S = b, c), the time (time T3) is one second after the time obtained by adding the reference start time and the relative time assuming that there is no leap second. The leap second adjusting unit 54 adjusts so that the presenting unit starts or ends the presentation corresponding to the relative time at the timing when the time in the receiving device arrives. This corresponds to the processing of steps S305 and S309 described above.

(3) In the case of neither (1) nor (2) above, the time in the receiving device is added to the time (time T1) obtained by adding the reference start time and the relative time assuming that there is no leap second. The leap second adjustment unit 54 adjusts so that the presentation unit starts or ends the presentation corresponding to the relative time at the timing when the time is reached. This corresponds to the processing of steps S308 and S309 described above.

As described above, according to the present embodiment, it is possible to correct the deviation of the presentation time due to the leap second and to start / end the presentation of the subtitles and the like at the correct timing.

[Fourth Embodiment]
Next, the fourth embodiment will be described. Also in the present embodiment, as in the third embodiment, the leap second indicator corresponding to the current time is not included in the additional identification information of the subtitle / character super transmission method. The leap second indicator corresponding to the reference start time is included in the additional identification information of the subtitle / character super transmission method.
In the following, the same functional blocks as those in the above-described embodiment may be designated by the same reference numerals and detailed description thereof may be omitted. In the following, the matters peculiar to the present embodiment will be mainly described.

FIG. 17 is a block diagram showing a schematic functional configuration of the receiving device according to the present embodiment. The receiving device 10 is a television receiver for receiving television broadcasts and the like. As shown in the figure, the receiving device 10 includes a receiving unit 11, a channel selection unit 12, a demodulation unit 14, a separation unit 15, a video decoding unit 21, an audio decoding unit 22, a character super processing unit 23, and subtitles. The processing unit 24, the time information reception processing unit 31, the time management unit 35 in the receiving device, the presentation unit 51, and the leap second adjustment unit 55 are included. That is, the receiving device 10 includes a time management unit 35 in the receiving device instead of the time management unit 32 in the receiving device in the first embodiment, and a leap second adjusting unit in place of the leap second adjusting unit 52 in the first embodiment. 55 is provided. The leap second adjustment unit 55 may exist outside the presentation unit 51.
The functional configuration on the transmitter side in this embodiment is the same as that in the first embodiment. However, the transmission device 2 according to the present embodiment does not include the leap second indicator corresponding to the current time in the additional identification information related to the transmission of subtitles and the like. The transmission device 2 according to the present embodiment is the same as the first embodiment in that the leap second indicator corresponding to the current time is included in the NTP packet included in the broadcast signal. That is, the leap second display setting unit 72 in the present embodiment does not set the current time leap second indicator in the additional identification information. Then, the time information setting unit 71 in the present embodiment sets a leap second indicator (NTP-LI) in the NTP data.

The time management unit 35 in the receiving device has an internal clock in the receiving device to manage the time in the receiving device, and synchronizes the time in the receiving device with the standard time (NTP time) received from the outside at least at a predetermined timing. Let me. The clock in the receiving device normally advances based on a predetermined reference (clock signal or the like) in the receiving device. The time management unit 35 in the receiving device corrects the clock in the receiving device at a predetermined timing by using the NTP time notified from the time information receiving processing unit 31. Further, the time management unit 35 in the receiving device supplies the information of the time in the receiving device to the presenting unit 51.

The time management unit 35 in the receiving device in the present embodiment corrects the clock in the receiving device at the same timing as the time management unit 33 in the receiving device in the second embodiment. That is, the time management unit 35 in the receiving device in the present embodiment sets the above NTP time only when there is a tuning operation in the receiving device 10 or when the power is turned on / off, and only at those times. Correct the clock in the receiving device used. These operations are performed by, for example, a remote control signal from a remote control device. That is, in the present embodiment, the clock in the receiving device is deviated from the NTP time when the seconds are inserted or deleted, but the time management unit 35 in the receiving device does not necessarily immediately enter the receiving device. The process of setting the clock to the NTP time is not performed. The reason is as described in the second embodiment.

The time management unit 35 in the receiving device manages the leap second correction state in the receiving device, and notifies the leap second adjusting unit 55 of the leap second correction state at each time. The leap second correction state is set to S for convenience. The meaning of the value that S has is six kinds of a to f. The meanings of the S values (a, b, c, d, e, f) are as described in the third embodiment. However, in this embodiment, S = c and S = d are not possible. The reason why S = c is not satisfied is that, as described above, the process of synchronizing the clock in the receiving device with the current time is not performed immediately after the leap second is executed (insertion of seconds or deletion of seconds). That is, the value that S can take in this embodiment is any one of the four values a, b, e, and f.
Since the meanings of the values a, b, c, d, e, and f are as described in the third embodiment, the description thereof will be omitted here.

The leap second adjustment unit 55 adjusts the presentation timing based on the leap second indicator (RST-LI) with respect to the reference start time and the value of the above state S.

The additional identification information regarding the transmission of the subtitle / character supermarket used in the present embodiment is the same as that in the third embodiment. That is, also in this embodiment, the additional identification information shown in FIG. 15 is used. That is, the additional identification information used in this embodiment does not store the leap second indicator corresponding to the current time. However, the additional identification information stores a leap second indicator (reference_start_time_leap_indicator, RST-LI) regarding the reference start time, as in the first embodiment, the second embodiment, and the third embodiment.

Next, the operation procedure of the receiving device 10 will be described.
FIG. 18 is a flowchart showing a procedure of operation of the receiving device 10 regarding adjustment of leap seconds in the presentation of subtitles and the like. As a premise of the processing, "1" or "2" is displayed as the value of NTP-LI from about 24 hours before the leap second is executed. Then, the receiving device 10 acquires this information by NTP. In the figure, the operation of the receiving device 10 is shown as "TYPE 4" for convenience. The receiving device of this "TYPE 4" may be referred to as a "receiving device of assumed operation 2".

The leap second adjustment unit 55 describes the flowcharts shown in both figures for each relative time (relative time indicating the timing of the start or end of presentation of the subtitles) specified in the TTML document storing the subtitles and the like. Perform processing. Hereinafter, the description will be given according to this flowchart.

First, in step S401, the leap second adjustment unit 55 performs initial processing. The content of the initial process is the same as that of step S301 in the third embodiment.
That is, the leap second adjustment unit 55 sets the time indicated by the start time + relative time to T1. Further, the leap second adjustment unit 55 sets the time 1 second before T1 as T2. Further, the time 1 second after T1 is defined as T3. Further, the leap second adjustment unit 55 sets the value of the leap second indicator corresponding to the reference start time as LI.

Next, in step S402, the leap second adjustment unit 55 acquires the current time and the leap second correction state from the time management unit 34 in the receiving device. Specifically, it is as follows.
First, the leap second adjustment unit 55 receives a notification of the leap second correction state S from the time management unit 35 in the receiving device. There are six values of S, a, b, c, d, e, and f, and their meanings are as described above. However, in the receiving device 9 of the present embodiment, the value of S is always any of a, b, e, and f.
Then, the leap second adjustment unit 55 sets the current time in the receiving device to T0.

Next, in step S403, the leap second adjustment unit 55 branches the process according to the LI value (that is, RST-LI). LI can take three values of 0, 1, and 2. When the value of LI is 2 (when the seconds are deleted within 24 hours after the reference start time), the leap second adjustment unit 55 transfers control to step S404. When the value of LI is 1 (when the second is inserted within 24 hours after the reference start time), the leap second adjustment unit 55 transfers control to step S405. If the LI value is 0 (no seconds are inserted or deleted within 24 hours after the reference start time), the leap second adjustment unit 55 transfers control to step S406.

Next, when the process proceeds to step S404, the leap second adjustment unit 55 branches the process according to the value of S in the same step. When the value of S is b, the leap second adjustment unit 55 transfers control to step S407. When the value of S is either a or f, the leap second adjustment unit 55 shifts control to step S409. Note that control is transferred to this step when LI = 2, in which case the value of S is any of a, b, and f, and c, d, and e are not possible.

Next, when the process proceeds to step S405, the leap second adjustment unit 55 branches the process according to the value of S in the same step. When the value of S is b, the leap second adjustment unit 55 transfers control to step S408. When the value of S is any of a and e, the leap second adjustment unit 55 shifts control to step S409. Note that control is transferred to this step when LI = 1, in which case the value of S is any of a, b, and e, and c, d, and f cannot be present.

Next, when the process proceeds to step S406, the leap second adjustment unit 55 branches the process according to the value of S in the same step. When the value of S is e, the leap second adjustment unit 55 shifts control to step S407. When the value of S is f, the leap second adjustment unit 55 transfers control to step S408. When the value of S is any of a and b, the leap second adjustment unit 55 shifts control to step S409. Note that control is transferred to this step when LI = 0, in which case the value of S is any of a, b, e, and f, and c and d are not possible.

Next, when the process proceeds to step S407, the leap second adjustment unit 55 makes a determination by comparing the times T3 and T0 in the same step. That is, the timing at which the presentation operation should be executed is T3. When T3 = T0 (step S407: YES), the leap second adjustment unit 55 shifts control to step S410 because it is the timing at which the presentation operation (start or end of presentation of subtitles or the like) should be executed. If T3 = T0 (step S407: NO), the timing (T3) for executing the presentation operation has not yet arrived, so the process returns to step S402.
However, in the process of returning the control to step S402, the time in the receiving device is updated in seconds. In other words, the leap second adjustment unit 55 waits for the process of step S402 to be executed next to be started until the seconds in the time in the receiving device are updated.

Next, when the process proceeds to step S408, the leap second adjustment unit 55 makes a determination by comparing the times T2 and T0 in the same step. That is, the timing at which the presentation operation should be executed is T2. When T2 = T0 (step S408: YES), the leap second adjustment unit 55 shifts control to step S410 because it is the timing at which the presentation operation (start or end of presentation of subtitles or the like) should be executed. If T2 = T0 (step S408: NO), the timing (T2) for executing the presentation operation has not yet arrived, so the process returns to step S402.
However, in the process of returning the control to step S402, the time in the receiving device is updated in seconds. In other words, the leap second adjustment unit 55 waits for the process of step S402 to be executed next to be started until the seconds in the time in the receiving device are updated.

Next, when the process proceeds to step S409, the leap second adjustment unit 55 makes a determination by comparing the times T1 and T0 in the same step. That is, the timing at which the presentation operation should be executed is T1. When T1 = T0 (step S409: YES), the leap second adjustment unit 55 shifts control to step S410 because it is the timing at which the presentation operation (start or end of presentation of subtitles or the like) should be executed. When T1 = T0 is not (step S409: NO), the timing (T1) for executing the presentation operation has not yet arrived, so the process returns to step S402.
However, in the process of returning the control to step S402, the time in the receiving device is updated in seconds. In other words, the leap second adjustment unit 55 waits for the process of step S402 to be executed next to be started until the seconds in the time in the receiving device are updated.

When moving to step S410 (from any of steps S407, S408, and S409), the leap second adjustment unit 55 sets the time as the operation time in this step. Here, "set as an operation time" means an operation of starting presentation of subtitles or the like (when presentation start (@begin) is specified as a relative time) or an operation of ending presentation of subtitles or the like (presentation end as a relative time). (When (@end) is specified) is executed. When the leap second adjusting unit 55 performs such control, the presenting unit 51 executes a designated operation (presentation start or presentation end) at the timing when the leap second adjustment is performed. After executing the process of step S410, the leap second adjustment unit 55 ends the process of the entire flowchart.

The processing by the leap second adjustment unit 55 described using the flowchart is as follows.

(1a) Reference start time Indicates that the leap second indicator is within a predetermined length of time before the leap second is executed, and indicates that the leap second is an insertion of seconds, and the above-mentioned When it indicates that the leap second correction state notified from the time management unit in the receiving device is not within a predetermined length of time before the leap second is executed (S = b).
(1b) The reference start time, which indicates that the time indicator is not within a predetermined length of time before the execution of the time, and the time management unit in the receiving device notifies the time, the time is such that the time is corrected. When indicating that the time in the receiving device is behind the standard time (S = f), (1) if any of the above (1a) or (1b), the reference start. At the timing when the time in the receiving device arrives at the time (time T2) one second before the time obtained by adding the time and the relative time assuming that there is no number of seconds, the presentation start or presentation corresponding to the relative time is started. The quiet second adjusting unit 55 adjusts so that the presenting unit finishes the process. This corresponds to the processing of steps S408 and S410 described above.

(2a) Reference start time Indicates that the leap second indicator is within a predetermined length of time before the leap second is executed, and indicates that the leap second is a deletion of seconds, and the above-mentioned When it indicates that the leap second correction state notified from the time management unit in the receiving device is not within a predetermined length of time before the leap second is executed (S = b).
(2b) The reference start time, which indicates that the time indicator is not within a predetermined length of time before the execution of the time, and the time management unit in the receiving device notifies the time, the time is such that the time is corrected. When indicating that the time in the receiving device is ahead of the standard time (S = e), (2) when it is either (2a) or (2b) above, refer to the above. At the timing when the time in the receiving device arrives at the time (time T3) one second after the time obtained by adding the start time and the relative time assuming that there is no quiet second, the presentation start corresponding to the relative time or The quiet second adjusting unit 55 adjusts so that the presenting unit finishes the presentation. This corresponds to the processing of steps S407 and S410 described above.

(3) In the case of neither (1) nor (2) above, the time in the receiving device is added to the time (time T1) obtained by adding the reference start time and the relative time assuming that there is no leap second. The leap second adjustment unit 55 adjusts so that the presentation unit starts or ends the presentation corresponding to the relative time at the timing when is reached. This corresponds to the processing of steps S409 and S410 described above.

As described above, according to the present embodiment, it is possible to correct the deviation of the presentation time due to the leap second and to start / end the presentation of the subtitles and the like at the correct timing.

[Modification example, etc.]
Hereinafter, the modifications already described with respect to the first embodiment and the second embodiment may be applied to the third embodiment and the fourth embodiment. Further, the assumptions described with respect to the first embodiment and the second embodiment are also assumed in the third embodiment and the fourth embodiment.
In the third and fourth embodiments, the situation of operating in Japan time has been explained, but the same operation is possible in local time in each place as long as the time difference from Coordinated Universal Time is set correctly. be.

It should be noted that at least a part of the functions of the receiving device and the transmitting device in the third embodiment or the fourth embodiment described above may be realized by a computer as in the case of the first embodiment and the second embodiment. good. Even in that case, let the computer load the program and execute it.

Although the third embodiment and the fourth embodiment have been described in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the design and the like within a range not deviating from the gist of the present invention, etc. Is also included.

[Timing example]
Hereinafter, examples of clock management and state S management inside the receiving devices of the third and fourth embodiments will be described.
19 and 20 show the relationship between the clock management and the leap second correction state (state S) inside the receiving devices of the third embodiment and the fourth embodiment when the leap second is implemented. It is a schematic diagram. Note that FIG. 19 shows a situation in which seconds are inserted. Further, FIG. 20 shows a situation in which seconds are deleted. A line number for reference is attached to the left end of each of FIGS. 19 and 20 for convenience.

First, in FIG. 19, the first to eleventh lines show the day before the leap second is implemented (Japan time), the time is skipped, and the 21st to 37th lines are the day of the leap second implementation (Japan time). ) Is shown. From the left, each digit shown in the figure shows the time when UTC time is converted to Japan time (UTC plus 9 hours), the time when NTP time is converted to Japan time, and the receiver of "TYPE 3" (according to the third embodiment). The value of the clock in the receiver in the receiver 9), the leap second correction state (state S), and "TYPE".
4 ”corresponds to the value of the clock in the receiving device and the leap second correction state (state S) in the receiver (receiver 10 according to the fourth embodiment). Since the figure shows the case where seconds are inserted, in UTC time (converted to Japan time), 08:59:58, 08:59:59, and 08: There is a time (second) of 59:60, followed by 09:00:00. The NTP time (converted to Japan time) is basically the same as the UTC time (converted to Japan time), but as the data display, the NTP corresponding to 08:59:60 of the UTC time (converted to Japan time). The time (converted to Japan time) is displayed at 08:59:59. The 26th line in the figure corresponds to this.

In the TYPE 3 receiver (receiver 9 of the third embodiment) of FIG. 19, the clock in the receiver is always synchronized with the NTP time. The values of the leap second correction state (state S) are as follows. That is, until 08:59:59 (Japan time, the same applies hereinafter) on the day before the leap second is executed, the value of the state S is b (indicating that the leap second does not occur). From 09:00 on the day before the leap second implementation to 08:59:59 on the day of the leap second implementation (the first 08:59:59 in the NTP time and the clock in the receiving device), the value of the state S is a. (Indicates that there is a leap second correction within 24 hours from that time). Then, at 08:59:60 on the day of leap second implementation (the second 08:59:59 in the NTP time and the clock in the receiving device), the value of the state S is d (seconds inserted by leap seconds). Indicates that there is). After that, from 09:00 on the day of the leap second implementation until the operation such as channel selection is performed (until 09:00:05 in the figure), the value of the state S is c (the leap second correction is completed). It shows that). Then, after the operation such as tuning (after 09: 00: 08 in the figure), the value of the state S returns to b.

In the TYPE 4 receiver (receiver 10 of the fourth embodiment) of FIG. 19, the clock in the receiver is normally synchronized with the NTP time, but the operation such as channel selection is performed after the leap second is executed. In the meantime, the two will not be synchronized. The changes in the value of the leap second correction state (state S) with the passage of the state are as follows. That is, until 08:59:59 (Japan time, the same applies hereinafter) on the day before the leap second is executed, the value of the state S is b (indicating that the leap second does not occur). From 09:00 on the day before the leap second implementation to 08:59:59 on the day of the leap second implementation (the first 08:59:59 in the NTP time and the clock in the receiving device), the value of the state S is a. (Indicates that there is a leap second correction within 24 hours from that time). Then, from 08:59:60 on the day of the leap second (for the NTP time and the clock in the receiving device, 08:59:59 for the second time) until the next operation such as channel selection is performed (in the figure, the figure shows). (Until 09:00:05), the value of the state S is e (indicating that the time in the receiving device is ahead). Then, after the operation such as tuning (after 09: 00: 08 in the figure), the value of the state S returns to b.

Next, in FIG. 20, the first to eleventh lines show the day before the leap second is implemented (Japan time), the time is skipped, and the 21st to 35th lines are the day of the leap second implementation (Japan). Time) is shown. Each digit shown in FIG. 19 is the same as each digit shown in FIG. Since the figure shows the case where seconds are deleted, the UTC time (converted to Japan time) is 08:59:58 on the day of leap second implementation, followed by 08:59:59 (seconds). ) Does not exist, and it moves to 09:00:00 (line 25). In a situation where seconds are deleted, the NTP time (converted to Japan time) is basically the same as the UTC time (converted to Japan time).

In the TYPE 3 receiver (receiver 9 of the third embodiment) of FIG. 20, the clock in the receiver is always synchronized with the NTP time. The values of the leap second correction state (state S) are as follows. That is, until 08:59:59 (Japan time, the same applies hereinafter) on the day before the leap second is executed, the value of the state S is b (indicating that the leap second does not occur). From 09:00 on the day before the leap second implementation to 08:59:58 on the day of the leap second implementation, the value of the state S is a (indicating that there is a leap second correction within 24 hours from that time). And 08:59:59 does not exist on the day of leap second implementation. Then, from 09:00 on the day of the leap second implementation until the operation such as channel selection is performed (until 09:00:05 in the figure), the value of the state S is c (the leap second correction is completed). It shows that). Then, after the operation such as tuning (after 09: 00: 08 in the figure), the value of the state S returns to b.

In the TYPE 4 receiver (receiver 10 of the fourth embodiment) of FIG. 19, the clock in the receiver is normally synchronized with the NTP time, but the operation such as channel selection is performed after the leap second is executed. In the meantime, the two will not be synchronized. The changes in the value of the leap second correction state (state S) with the passage of the state are as follows. That is, until 08:59:59 (Japan time, the same applies hereinafter) on the day before the leap second is executed, the value of the state S is b (indicating that the leap second does not occur). From 09:00 on the day before the leap second implementation to 08:59:58 on the day of the leap second implementation, the value of the state S is a (indicating that there is a leap second correction within 24 hours from that time). And there is no 08:59:59 on the day of leap second implementation. Then, from 09:00:00 on the day of the leap second (however, 08:59:59 in the clock in the receiving device) until the next operation such as channel selection is performed (in the figure, 09 of the NTP time). At: 00:05 (until 09:00:04 on the clock in the receiving device), the value of the state S is f (indicating that the time in the receiving device is delayed). Then, after the operation such as tuning (after 09: 00: 08 in the figure), the value of the state S returns to b.

[Characteristics of each embodiment]
The method including the leap second indicator corresponding to the current time in the additional identification information is the first embodiment and the second embodiment.
The method in which the leap second indicator corresponding to the current time is not included in the additional identification information is the third embodiment and the fourth embodiment.
The method of constantly synchronizing the NTP time and the clock in the receiving device is the first embodiment and the third embodiment.
After the leap second is executed, the method of allowing the NTP time and the clock in the receiving device to deviate (asynchronously) until a predetermined operation (tuning, power on / off, etc.) is performed is the second embodiment and the fourth embodiment. Is.

The present invention can be used in a receiving device (television receiver) or the like that displays character text such as subtitles at a designated timing.

1,8,9,10 Receiver 2 Transmitter 11 Receiver 12 Channel selection 14 Demodulation 15 Separation 21 Video decoding 22 Audio decoding 23 Character super processing (timed text processing)
24 Subtitle processing unit (timed text processing unit)
31 Time information reception processing unit 32, 33, 34, 35 Time management unit in the receiving device 51 Presentation unit 52, 53, 54, 55 Leap second adjustment unit 61 Video coding unit 62 Audio coding unit 63 Character super setting unit (time) Text setting section)
64 Subtitle setting section (timed text setting section)
71 Time information setting unit 72 Leap second display setting unit 81 Mixing unit 82 Modulation unit 83 Transmission unit

Claims (4)

A receiver that receives transmission signals of content including timed text, and
The timed text included in the transmission signal, information on the reference start time, and a reference start time indicating whether or not the reference start time is within a predetermined length of time before the leap second is executed. Leap second specifier, timed text processing unit to get,
Equipped with
The timed text processing unit acquires the timed text to which information on the presentation start time and the presentation end time designated as relative times starting from the reference start time is added.
A clock is provided inside to manage the time in the receiving device, and a time management unit in the receiving device that synchronizes the time in the receiving device with the standard time received from the outside at least at a predetermined timing.
A presenting unit that starts and ends the presentation of the timed text based on the relative time according to the time in the receiving device managed by the time management unit in the receiving device.
Leap second adjustment that adjusts the timing at which the presenting unit starts or ends the presentation of the timed text by correcting the relative time shift caused by the leap second based on the reference start time leap second indicator. Department and
Further equipped,
The reference start time leap second indicator also indicates whether the leap second is an insertion or deletion of seconds when it indicates that the leap second is within a predetermined length of time before the execution of the leap second. can be,
The time management unit in the receiving device manages the time in the receiving device so as to always synchronize with the standard time, and notifies the leap second adjusting unit of information on the leap second correction state.
The leap second adjustment unit
(1) The reference start time leap second indicator indicates that the leap second indicator is within a predetermined length of time before the leap second is executed, and indicates that the leap second is an insertion of seconds.
(1a) Indicates that the leap second correction state notified from the time management unit in the receiving device is not within a predetermined length of time before the leap second is executed.
(1b) The leap second correction state notified from the time management unit in the receiving device indicates that the leap second correction has been completed for the time in the receiving device.
(1c) The leap second correction state notified from the time management unit in the receiving device indicates that the current time is the inserted second.
In the case of any of the above states (1a), (1b) or (1c), the time is one second before the time obtained by adding the reference start time and the relative time assuming that there is no leap second. At the timing when the time in the receiving device arrives, the presenting unit adjusts to start or end the presentation corresponding to the relative time.
A receiving device characterized by that. A receiver that receives transmission signals of content including timed text, and
The timed text included in the transmission signal, information on the reference start time, and a reference start time indicating whether or not the reference start time is within a predetermined length of time before the leap second is executed. Leap second specifier, timed text processing unit to get,
Equipped with
The timed text processing unit acquires the timed text to which information on the presentation start time and the presentation end time designated as relative times starting from the reference start time is added.
A clock is provided inside to manage the time in the receiving device, and a time management unit in the receiving device that synchronizes the time in the receiving device with the standard time received from the outside at least at a predetermined timing.
A presenting unit that starts and ends the presentation of the timed text based on the relative time according to the time in the receiving device managed by the time management unit in the receiving device.
Leap second adjustment that adjusts the timing at which the presenting unit starts or ends the presentation of the timed text by correcting the relative time shift caused by the leap second based on the reference start time leap second indicator. Department and
Further equipped,
The reference start time leap second indicator also indicates whether the leap second is an insertion or deletion of seconds when it indicates that the leap second is within a predetermined length of time before the execution of the leap second. can be,
The time management unit in the receiving device manages the time in the receiving device so as to always synchronize with the standard time, and notifies the leap second adjusting unit of information on the leap second correction state.
The leap second adjustment unit
(2) The reference start time leap second indicator indicates that the leap second indicator is within a predetermined length of time before the leap second is executed, and indicates that the leap second is a deletion of seconds.
(2a) Indicates that the leap second correction state notified from the time management unit in the receiving device is not within a predetermined length of time before the leap second is executed.
(2b) The leap second correction state notified from the time management unit in the receiving device indicates that the leap second correction has been completed for the time in the receiving device.
In the case of either the above (2a) or (2b) state, the receiving device is set at a time one second after the time obtained by adding the reference start time and the relative time assuming that there is no leap second. At the timing when the internal time is reached, the presentation unit adjusts to start or end the presentation corresponding to the relative time.
A receiving device characterized by that. A receiver that receives transmission signals of content including timed text, and
The timed text included in the transmission signal, information on the reference start time, and a reference start time indicating whether or not the reference start time is within a predetermined length of time before the leap second is executed. Leap second specifier, timed text processing unit to get,
Equipped with
The timed text processing unit acquires the timed text to which information on the presentation start time and the presentation end time designated as relative times starting from the reference start time is added.
A clock is provided inside to manage the time in the receiving device, and a time management unit in the receiving device that synchronizes the time in the receiving device with the standard time received from the outside at least at a predetermined timing.
A presenting unit that starts and ends the presentation of the timed text based on the relative time according to the time in the receiving device managed by the time management unit in the receiving device.
Leap second adjustment that adjusts the timing at which the presenting unit starts or ends the presentation of the timed text by correcting the relative time shift caused by the leap second based on the reference start time leap second indicator. Department and
Further equipped,
The reference start time leap second indicator also indicates whether the leap second is an insertion or deletion of seconds when it indicates that the leap second is within a predetermined length of time before the execution of the leap second. can be,
The time management unit in the receiving device manages the time in the receiving device so as to always synchronize with the standard time, and notifies the leap second adjusting unit of information on the leap second correction state.
The leap second adjustment unit
(1) A condition that the reference start time leap second indicator indicates that the leap second is within a predetermined length of time before the execution of the leap second, and that the leap second indicates that the second is inserted. When,
(2) A condition that the reference start time leap second indicator indicates that the leap second is within a predetermined length of time before the implementation of the leap second, and that the leap second indicates that the second is deleted. And
If neither is the case, the presentation start or presentation end corresponding to the relative time at the timing when the time in the receiving device arrives at the time obtained by adding the reference start time and the relative time assuming that there is no leap second. Is adjusted so that the presentation unit performs
A receiving device characterized by that. Computer,
The receiving device according to any one of claims 1 to 3.
A program to function as.

Images