JP6166957B2 - Time synchronization system - Google Patents

Description

  The present invention relates to a time synchronization system that performs processing synchronized with a common time among a plurality of devices capable of communication via a network.

  Conventionally, for example, as a communication form between display devices such as a television and a display terminal (terminal having a display unit, smartphone, tablet, personal computer, etc.), content added to a program from meta information included in a broadcast wave on the television side Is extracted and transferred from a television to a display terminal (for example, see Patent Document 1).

  In the system described in Patent Document 1, additional content received from a television can be displayed on the display terminal side.

JP 2013-46386 A

  In the system described in Patent Document 1, it is necessary to provide a configuration for performing direct communication in both the television and the display terminal, and using a television and a display terminal that do not have such a configuration is possible. Can not.

  Therefore, attention is paid to the fact that recent display devices such as televisions and display terminals have a function of accessing a network such as the Internet, and it is conceivable to perform communication between display terminals via the network. .

  However, when communication is performed between display devices via a network in this way, the display on one display device and the display on the other display device can be performed in synchronization with each other due to the influence of communication delays and the like. It can be difficult.

  The present invention has been made in view of such a background, and an object of the present invention is to provide a time synchronization system capable of performing display in which time is synchronized between display devices using communication via a network. And

  The present invention has been made to achieve the above object, and relates to a time synchronization system that performs display in which time is synchronized between a first display device and a second display device.

And the 1st aspect of the present invention is:
A time synchronization system that performs display in which time is synchronized between a first display device and a second display device,
The first display device includes:
A first display unit;
A first timing unit;
A first network communication unit for performing communication via a network;
A first display control unit for controlling display of the first display unit;
A first common time acquisition unit for executing a first common time acquisition process of accessing the common time measurement unit via the network by the first network communication unit and acquiring data of a time measurement time of the common time measurement unit;
In the first common time acquisition process, the first common time acquisition unit transmits the first time request data for requesting the time measurement data of the common time measurement unit to the common time measurement unit. The first common time acquisition unit has received the first time measurement data transmitted from the common time measurement unit in response to the transmission of the first time request data from the first request transmission time which is the time measurement time of the time measurement unit. Based on the time difference between the intermediate time until the first response reception time, which is the time measurement time of the first time measurement unit, and the time indicated by the first time measurement time data, the time measurement time of the first time measurement unit is determined. A first correction value calculating unit that calculates a first correction value to be corrected and converted to a time measured by the common time measuring unit;
An event occurrence first time recognizing unit for recognizing a time measured by the first time measuring unit at which a predetermined event is displayed on the first display unit as an event occurrence first time;
The event occurrence common time is calculated by converting the event occurrence first time to the time measured by the common timekeeping unit using the first correction value, and the event occurrence notification data including the event occurrence common time data is An event transmission unit that transmits to the second display device via the network by a first network communication unit;
The second display device
A second display;
A second timing unit;
A second network communication unit for communicating via the network;
A second common time acquisition unit that executes a second common time acquisition process for accessing the common time measurement unit via the network and acquiring the time measurement data of the common time measurement unit by the second network communication unit;
In the second common time acquisition process, the second common time acquisition unit transmits the second time request data for requesting the time measurement data of the common time measurement unit to the common time measurement unit. The second common time acquisition unit receives the second time measurement data transmitted from the common time measurement unit in response to the transmission of the second time request data from the second request transmission time which is the time measurement time of the time measurement unit. Based on the time difference between the intermediate time until the second response reception time that is the time measurement time of the second time measurement unit and the time indicated by the second time measurement data, the time measurement time of the second time measurement unit is calculated. A second correction value calculation unit that calculates a second correction value to be corrected and converted to the time measured by the common time measuring unit;
When the event occurrence notification data is received by the second network communication unit, the event occurrence common time recognized from the event occurrence notification data is measured by the second timing unit using the second correction value. An event occurrence second time recognition unit for recognizing the event occurrence second time corrected to the time;
A second display control unit that performs a display corresponding to the event on the second display unit when the time measured by the second time measuring unit reaches an event start notification time set based on the second event occurrence time It is characterized by comprising.

  According to the present invention, the first display device acquires the time data of the common time measuring unit by the first common time acquiring unit, and measures the time of the first time measuring unit by the first correction value calculating unit. The first correction value for correcting the time to the time measured by the common time measuring unit is calculated. Similarly, the second display device calculates the second correction value for correcting the time measured by the common time measuring unit to the time measured by the common time measuring unit by the second common time acquiring unit. In this way, by calculating the first correction value and the second correction value, in the first display device, the time counting time of the first time measuring unit is calculated using the first correction value. It becomes possible to convert to timekeeping time. In the second display device, it is possible to correct the time measured by the second time measuring unit to the time measured by the common time measuring unit using the second correction value.

  Then, the event occurrence transmission unit of the first display device transmits the event occurrence notification data including the event occurrence common time data obtained by correcting the event occurrence first time to the time measured by the common timing unit via a network. To the second display device. The second display control unit of the second display device, when receiving the event occurrence notification data via a network, sets the event occurrence common time recognized from the event occurrence notification data to the second timekeeping. The event occurrence second time corrected to the time count of the part is calculated.

  Then, the second display control unit displays the event on the second display unit when the time measured by the second time counting unit reaches the event start notification time set based on the second event occurrence time. Display accordingly. As a result, between the first display device and the second display device, using the communication via the network, the time synchronized with the time measured by the common time measuring unit as a common timing index is displayed. It can be carried out.

In the first aspect,
The first correction value calculation unit executes the first common time acquisition process by the first common time acquisition unit, and an intermediate time between the first request transmission time and the first response reception time; A process of obtaining a time difference from the time indicated by the first time measurement time data is executed a plurality of times, and the corresponding first request transmission time and the first time measurement time data among the time differences obtained by the plurality of processes are A time difference in which a difference between a first outgoing communication time that is a difference between the times indicated and a first return communication time that is a difference between the corresponding first response reception time and the time indicated by the first time measurement time data is a short time. The first correction value may be calculated with priority.

  According to this configuration, when the communication between the first display device and the common timing unit via the network is good and the delay time in communication is short, the first outgoing communication time ( The time required for data transmission from the first display device to the common time measuring unit is indicated) and the first return communication time (the time required for data transmission from the common time measuring unit to the first display device is indicated). The difference with is small. Therefore, the difference between the first forward communication time and the first return communication time is a short time among the time differences obtained by executing the process for obtaining the time difference a plurality of times by the first correction value calculation unit. By using the time difference preferentially, the first correction value can be calculated with high accuracy.

In the first aspect,
The second correction value calculation unit executes the second common time acquisition process by the second common time acquisition unit, and an intermediate time between the second request transmission time and the second response reception time; A process of obtaining a time difference from the time indicated by the second time measurement time data is executed a plurality of times, and among the time differences obtained by the plurality of times of processing, the corresponding second request transmission time and the second time measurement time data are A time difference in which the difference between the second forward communication time, which is the difference between the times indicated, and the second return communication time, which is the difference between the corresponding second response reception time and the time indicated by the second time measurement time data, is short. The second correction value may be calculated with priority.

  According to this configuration, when the communication between the second display device and the common timing unit via the network is good and the delay time in communication is short, the second forward communication time ( Indicating the time required for data transmission from the second display device to the common timing unit) and the second return communication time (indicating the time required for data transmission from the common timing unit to the second display device) ) Becomes smaller. Therefore, the difference between the second forward communication time and the second return communication time is a short time among the time differences obtained by executing the process for obtaining the time difference a plurality of times by the second correction value calculation unit. By using the time difference preferentially, the second correction value can be calculated with high accuracy.

Next, the second aspect of the present invention is as follows.
The first display device includes:
A first display unit;
A first timing unit;
A first network communication unit for performing communication via a network;
A first display control unit for controlling display of the first display unit;
An event occurrence first time recognizing unit for recognizing a time measured by the first time measuring unit at which a predetermined event is displayed on the first display unit as an event occurrence first time;
An event occurrence notification unit that transmits event occurrence notification data including data of the event occurrence first time to the second display device via the network by the first network communication unit;
The second display device
A second display;
A second timing unit;
A second network communication unit for communicating via the network;
The second network communication unit accesses the first clocking unit of the first display device via the network and executes a first clocked time acquisition process for acquiring clocked time data of the first clocking unit. A first timing acquisition unit;
In the first time measurement time acquisition process, the first time measurement time acquisition unit transmits the third time request data requesting the time measurement data of the first time measurement unit to the first display device. The third clock time data transmitted from the second display device in response to the transmission of the third time request data by the first clock time acquisition unit from the third request transmission time which is the clock time of the second clock unit. On the basis of the time difference between the intermediate time until the third response reception time that is the time measurement time of the second time measurement unit and the time indicated by the third time measurement time data. A third correction value calculation unit that calculates a third correction value for correcting the time measurement time and converting it to the time measurement time of the second time measurement unit;
When the event occurrence notification data is received by the second network communication unit, the event occurrence first time recognized from the event occurrence notification data is determined using the third correction value of the second timing unit. An event occurrence second time recognition unit for recognizing the event occurrence second time corrected to the timekeeping time;
A second display control unit that performs a display corresponding to the event on the second display unit when the time measured by the second time measuring unit reaches an event start notification time set based on the second event occurrence time It is characterized by comprising.

  According to the present invention, the second display device acquires the time data of the first time measurement unit of the first display device by the first time measurement time acquisition unit, and the third correction value calculation unit. To calculate the third correction value for correcting the time measured by the first time measuring unit to the time measured by the second time measuring unit. Thus, by calculating the third correction value, it is possible to correct the time measured by the second time measuring unit to the time measured by the first time measuring unit in the second display device.

  Then, the event occurrence transmission unit of the first display device transmits the event occurrence notification data including data of the event occurrence first time to the second display device via a network. In addition, the second display control unit of the second display device sets the first event occurrence time recognized from the event occurrence notification data when the event occurrence notification data is received via a network. 2. Calculate the event occurrence second time corrected to the time measured by the time measuring unit.

  Then, the second display control unit performs a display corresponding to the event on the second display unit when the time measured by the second time measuring unit becomes the second event occurrence time. As a result, a display in which the time is synchronized between the first display device and the second display device, using the time measured by the first timekeeping unit as a common timing index using communication via a network. It can be performed.

In the second aspect,
The third correction value calculation unit executes the first time measurement time acquisition process by the first time measurement time acquisition unit, and an intermediate time between the third request transmission time and the third response reception time; A process for obtaining a time difference from the time indicated by the third time measurement time data is executed a plurality of times, and among the time differences obtained by the plurality of processes, the corresponding third request transmission time and the third time measurement time data are A time difference in which the difference between the third forward communication time, which is the difference between the times indicated, and the third return communication time, which is the difference between the corresponding third response reception time and the time indicated by the third time measurement data, is short. The third correction value may be calculated with priority.

  According to this configuration, when the communication between the first display device and the second display device via the network is good and the delay time in the communication is short, the third forward communication time (Indicates the time required for data transmission from the second display device to the first display device) and the third return communication time (required for data transmission from the first display device to the second display device) The difference with time) is reduced. Therefore, the difference between the third forward communication time and the third return communication time is a short time among the time differences obtained by executing the process for obtaining the time difference a plurality of times by the third correction value calculation unit. By using the time difference preferentially, the third correction value can be calculated with high accuracy.

Next, the third aspect of the present invention is as follows.
The first display device includes:
A first display unit;
A first timing unit;
A first network communication unit for performing communication via a network;
A first display control unit for controlling display of the first display unit;
The first network communication unit accesses the second clock unit included in the second display device via the network, and executes a second clock time acquisition process for acquiring clock time data of the second clock unit. A second timing acquisition unit;
In the second clock time acquisition process, the second clock time acquisition unit transmits the fourth time request data for requesting the clock time data of the second clock unit to the second display device. The fourth time measurement data transmitted from the first display device in response to the transmission of the fourth time request data from the fourth request transmission time that is the time measurement time of the first time measurement unit. On the basis of the time difference between the intermediate time until the fourth response reception time, which is the time measurement time of the first time measurement unit, and the time indicated by the fourth time measurement time data. A fourth correction value calculation unit for calculating a fourth correction value for correcting the time measurement time and converting it to the time measurement time of the first time measurement unit;
An event occurrence first time recognizing unit for recognizing a time measured by the first time measuring unit at which a predetermined event is displayed on the first display unit as an event occurrence first time;
An event occurrence notification including data of the event occurrence second time is calculated by calculating an event occurrence second time obtained by converting the event occurrence first time into the time measurement time of the second time measurement unit using the fourth correction value. An event occurrence transmission unit that transmits data to the second display device via the network by the first network communication unit;
The second display device
A second display;
The second timing unit;
A second network communication unit for communicating via the network;
An event occurrence second time recognition unit for recognizing the event occurrence second time from the event occurrence notification data when the second network communication unit receives the event occurrence notification data via the network;
A second display control unit that performs a display corresponding to the event on the second display unit when the time measured by the second time measuring unit reaches an event start notification time set based on the second event occurrence time It is characterized by comprising.

  According to the present invention, the first display device acquires the time data of the second time measuring unit of the second display device by the second time measuring time acquisition unit, and the fourth correction value calculation unit. To calculate the fourth correction value for correcting the time measured by the first time measuring unit to the time measured by the second time measuring unit. Thus, by calculating the fourth correction value, the time measured by the first time measuring unit can be corrected to the time measured by the second time measuring unit in the first display device.

  The event occurrence transmission unit of the first display device includes data of the event occurrence second time obtained by correcting the event occurrence first time to a time measured by the second time measurement unit of the second display device. Event occurrence notification data is transmitted to the second display device via the network. The second display control unit of the second display device recognizes the event occurrence second time from the event occurrence notification data when the event occurrence notification data is received via a network.

  Then, the second display control unit displays the event on the second display unit when the time measured by the second time counting unit reaches the event start notification time set based on the second event occurrence time. Display accordingly. Thereby, the display which synchronized the time using the time keeping time of the said 2nd time measuring part as a common timing parameter | index using the communication via a network between the said 1st display apparatus and the said 2nd display apparatus. It can be performed.

In the third aspect,
The fourth correction value calculation unit performs the second time measurement processing by the second time measurement time acquisition unit, and an intermediate time between the fourth request transmission time and the fourth response reception time; A process for obtaining a time difference from the time indicated by the fourth time measurement time data is executed a plurality of times, and among the time differences obtained by the plurality of times, the corresponding fourth request transmission time and the fourth time measurement time data are A time difference in which the difference between the fourth forward communication time, which is the difference between the times indicated, and the fourth return communication time, which is the difference between the corresponding fourth response reception time and the time indicated by the fourth timekeeping time data, is short. The fourth correction value may be calculated with priority.

  According to this configuration, when the communication between the first display device and the second display device via the network is good and the delay time in communication is short, the fourth forward communication time (Indicating the time required for data transmission from the first display device to the second display device) and the fourth return communication time (required for data transmission from the second display device to the first display device) The difference with time) is reduced. Therefore, the difference between the fourth forward communication time and the fourth return communication time is short among the time differences obtained by executing the process for obtaining the time difference a plurality of times by the fourth correction value calculation unit. By using the time difference preferentially, the fourth correction value can be calculated with high accuracy.

Next, in the first aspect to the third aspect,
The first display device is a television having a broadcast receiving unit for receiving broadcast data;
The event occurrence first time recognizing unit, when the first display control unit displays a song program on the first display unit based on broadcast data received by the broadcast receiving unit, Recognizing the event occurrence first time as performance as the event,
The second display control unit performs a display for informing the second display unit of the start of the performance of the predetermined song when the time measured by the second time measuring unit reaches the event start notification time. .

  According to the present invention, when a song program is displayed on the television (first display device), the performance time of the predetermined song on the song program (common event occurrence time, event occurrence first time, event occurrence time) The event occurrence notification data including any one of two times is transmitted from the television to the second display device via a network.

  In the second display device that has received the event occurrence notification data, the event start notification time based on the second event occurrence time is set from the performance time of the predetermined song recognized from the event occurrence notification data. Is done. For this reason, the second display control unit can perform a display for notifying the second display unit of the start of the performance of the predetermined tune at the timing when the performance of the predetermined tune is started on the television, or just before that. .

  Furthermore, the second display device may include a singing level evaluation unit that executes a process of inputting a user's singing voice and evaluating the singing level in synchronization with the second time when the event occurs.

  According to this configuration, when the user who has visually confirmed the start of the performance of the predetermined song starts singing, the singing level evaluation unit determines that the event occurrence second time (the performance of the predetermined song is started). The process of evaluating the user's singing level can be executed in synchronization with (time). Therefore, the user's singing level can be appropriately evaluated based on the performance of the predetermined song.

1 is a configuration diagram of a first embodiment of a time synchronization system. Operation | movement explanatory drawing of 1st Embodiment of a time synchronization system. The block diagram of 2nd Embodiment of a time synchronization system. Operation | movement explanatory drawing of 2nd Embodiment of a time synchronous system. The block diagram of 3rd Embodiment of a time synchronization system. The block diagram of 3rd Embodiment of a time synchronization system.

  An embodiment of a time synchronization system of the present invention will be described with reference to FIGS.

[First Embodiment]
First, a first embodiment will be described with reference to FIGS.

  With reference to FIG. 1, the time synchronization system of 1st Embodiment is the television 10a (equivalent to the 1st display apparatus of this invention), and the portable terminal 30a (for example, a smart phone or a tablet terminal. 2nd display of this invention). Corresponding to the device).

  The television 10a includes a first timer 14 that counts a clock signal from an oscillator (not shown) and clocks the current time, a broadcast receiver 11 that receives broadcast data of a television broadcast via an antenna 50, and a network 60 (Internet A first network communication unit 12 that transmits / receives data via a communication network), and a first display 19 (liquid crystal panel or the like that corresponds to the first display unit of the present invention) that displays a TV broadcast program or the like. It has.

  Furthermore, the television 10a has a control board including a CPU, a memory, various interface circuits, and the like (not shown). The CPU executes a control program held in the memory, whereby the first common time acquisition unit 13 is executed. , Function as a first correction value calculation unit 15, event generation first time recognition unit 16, event generation transmission unit 17 a, and first display control unit 18. Details of processing by the first common time acquisition unit 13, the first correction value calculation unit 15, the event occurrence first time recognition unit 16, the event generation transmission unit 17a, and the first display control unit 18 will be described later.

  The television 10a communicates with the standard time server 70 (corresponding to the common timekeeping unit of the present invention) and the portable terminal 30a via the network 60 by the first network communication unit 12. The standard time server 70 transmits current time data of standard time (a time used in common by a certain country or region, for example, Japan standard time, which corresponds to the common time of the present invention) to a terminal accessed via the network 60. .

  In addition, the mobile terminal 30a includes a second clock unit 33 that counts a clock signal from an oscillator (not shown) and counts the current time, a second network communication unit 31 that transmits and receives data via the network 60, A second display 37 (a liquid crystal panel or the like, which corresponds to the second display unit of the present invention) for displaying information, and a microphone 39 for inputting a user's voice are provided.

  Furthermore, the portable terminal 30a has a control board including a CPU, a memory, various interface circuits, and the like (not shown), and the CPU executes a control program held in the memory, whereby the second common time acquisition unit 32, the second correction value calculation unit 34, the event occurrence second time recognition unit 35a, the second display control unit 36, and the singing level evaluation unit 38. Details of processing by the second common time acquisition unit 32, the second correction value calculation unit 34, the event occurrence second time recognition unit 35a, the second display control unit 36, and the singing level evaluation unit 38 will be described later.

  The portable terminal 30a communicates with the standard time server 70 and the television 10a via the network 60 by the second network communication unit 31.

  Next, referring to FIG. 2, when a song program is displayed on the first display 19 of the television 10 a, it is synchronized with the time when a specific singer A starts singing a predetermined song (playing a predetermined song). Then, a series of processes for performing a display prompting the user to start singing on the second display 37 of the mobile terminal 30a will be described.

  First, processing on the television 10a side will be described. The television 10a performs processing for recognizing the time common to the mobile terminal 30a. The first common time acquisition unit 13 (see FIG. 1) acquires standard time data (current time data) from the standard time server 70 via the network 60 by the first network communication unit 12 (first common time acquisition). processing).

  Specifically, the first common time acquisition unit 13 uses the first network communication unit 12 to send first time request data for requesting the standard time server 70 to transmit time measurement time data (current time standard time data). And sent to the standard time server 70 via the network 60. The first network communication unit 12 receives the first clock time data transmitted via the network 60 from the standard time server 70 that has received the first time request data.

  The first correction value calculation unit 15 includes a first request transmission time TIM11 that is a time measurement time of the first time measurement unit 14 when the first time request data is transmitted to the standard time server 70, and the first time measurement time data from the standard time server 70. Is recognized as the first response reception time TIM12 that is the time measurement time of the first time measurement unit 14 at the time of reception of.

  Then, the first correction value calculation unit 15 receives the intermediate time TIM13 (= TIM11 + (TIM12−TIM11) / 2) between the first request transmission time TIM11 and the first response reception time TIM12, and the first time measurement time data. A time difference ΔT1s (= TIM13−TIMs) from the indicated time (standard time measurement time) TIMs is calculated.

  Based on the time difference ΔT1s, the first correction value calculation unit 15 calculates a first correction value K1s for converting the time measurement TIM1 of the first time measurement unit 14 into the time measurement TIMs of standard time. Here, the first correction value calculation unit 15 receives the first time measurement time data (standard time measurement time data) by the first common time acquisition process, and from the first request transmission time TIM11 to the first response reception time TIM12. A process for calculating a time difference ΔT1s between the intermediate time TIM13 between the time TIME13 and the time TIMs indicated by the standard time measurement time data is executed a plurality of times. Then, the first correction value calculation unit 15 calculates the average value of the obtained plurality of time differences ΔT1s as the first correction value K1s.

  Here, when the communication status between the television 10a and the standard time server 70 is good and the communication delay time is short, the difference between the first request transmission time TIM11 and the time TIMs indicated by the first time measurement time data (first outgoing communication). The difference ΔTgb1 between the time (Tg1) and the difference (first return communication time) Tb1 between the first response reception time TIM12 and the time TIMs indicated by the first time measurement time data becomes small.

  Therefore, the time difference ΔTgb1 between the corresponding first outgoing communication time Tg1 (at the time of calculation) and the first return communication time Tb1 is preferentially selected from the calculated time differences ΔT1s. By obtaining the average value, the first correction value K1s with high accuracy can be obtained. For example, a predetermined number of time differences ΔT1s may be selected in order from the smallest ΔTbg1 among the obtained time differences ΔT1s, and the average value may be obtained. Alternatively, the average value may be obtained by excluding the time difference ΔT1s in which ΔTgb1 exceeds the preset upper limit time from the obtained plurality of time differences ΔT1s.

  Further, the average value may be obtained by excluding the time difference ΔT1s exceeding the upper limit time and selecting a predetermined number of time differences ΔT1s from the shortest time among the remaining time differences ΔT1s.

  The event occurrence first time recognizing unit 16 has a relative time from the broadcast data BRdat received by the broadcast receiving unit 11 (see FIG. 1) until the singing of the specific singer A is started from the start of the song program. And the time counting time (event occurrence first time) IVt1 of the first time counting unit 14 at which the singer A starts singing is recognized. In this case, the event occurrence first time IVt1 can be obtained by correcting the delay due to the decoding of the moving image data from the broadcast data BRdat on the television 10a.

  The event occurrence transmission unit 17a calculates the event occurrence standard time IVts (corresponding to the event occurrence common time of the present invention) obtained by correcting the event occurrence first time IVt1 to the standard time by the following equation (1).

IVts = IVt1-K1s (1)
Where IVts: event occurrence standard time, IVt1: event occurrence first time, K1s: first correction value.

  Then, the event occurrence transmission unit 17a transmits event occurrence notification data IVinfa including data of the event occurrence standard time IVts to the mobile terminal 30a via the network 60 by the first network communication unit 12.

  In addition, the first display control unit 18 starts to display the singer A's singing when the timing time TIM1 of the first timing unit 14 becomes the event occurrence first time IVt1.

  Next, processing on the mobile terminal 30a side will be described. The portable terminal 30a performs a process for recognizing a time common to the television 10a. The second common time acquisition unit 32 (see FIG. 1) acquires standard time data (current time data) from the standard time server 70 via the network 60 by the second network communication unit 31 (see FIG. 1) ( Second common time acquisition process).

  Specifically, the second common time acquisition unit 32 uses the second network communication unit 31 to send second time request data for requesting the standard time server 70 to transmit time measurement time data (current time standard time data). And sent to the standard time server 70 via the network 60. Then, the second network communication unit 31 receives the time measurement data transmitted via the network 60 from the standard time server 70 that has received the second time request data.

  The second correction value calculation unit 34 includes the second request transmission time TIM 21 that is the time measured by the second time measuring unit 33 at the time when the second time request data is transmitted to the standard time server 70, and the time measurement data of the standard time from the standard time server 70. Is recognized as the second response reception time TIM22, which is the time measurement time of the second time measurement unit 33 at the time of reception.

  Then, the second correction value calculation unit 34 includes an intermediate time TIM23 (= TIM21 + (TIM22−TIM21) / 2) between the second request transmission time TIM21 and the second response reception time TIM22, and time data of standard time. A time difference ΔT2s (= TIM23−TIMs) from the indicated time TIMs is calculated.

  The second correction value calculating unit 34 calculates a second correction value K2s for converting the time measured TIM2 of the second time measuring unit 33 into the standard time TIMs based on the time difference ΔT2s. Here, the second correction value calculation unit 34 receives the time data of the standard time by the second common time acquisition process, and the intermediate time TIM23 between the second request transmission time TIM21 and the second response reception time TIM22. The process of calculating the time difference ΔT2s from the time TIMs indicated by the standard time measurement time data is executed a plurality of times. Then, the second correction value calculation unit 34 calculates the average value of the obtained plurality of time differences ΔT2s as the second correction value K2s.

  Here, when the communication status between the television 10a and the standard time server 70 is good and the communication delay time is short, the difference (second outgoing communication time) Tg2 between the second request transmission time TIM21 and the time TIMs indicated by the second time measurement time data. And the difference ΔTgb2 between the second response reception time TIM22 and the difference (second return communication time) Tb2 between the times TIMs indicated by the second time measurement time data.

  Therefore, among the plurality of calculated time differences ΔT2s, the one having a short difference ΔTgb2 between the corresponding second outgoing communication time Tg2 (at the time of calculation) and the second return communication time Tb2 is preferentially selected. By obtaining the average value, the second correction value K2s with high accuracy can be obtained. The selection of the time difference ΔT2s may be performed in the same manner as the calculation procedure of the first correction value K1s by the first correction value calculation unit 15 described above.

  The event occurrence second time recognition unit 35a is included in the event occurrence notification data IVinfa when the second network communication unit 31 (see FIG. 1) receives the event occurrence notification data IVinfa from the television 10a via the network 60. The event occurrence standard time IVts is recognized from the data.

  Then, the event occurrence second time recognizing unit 35a calculates the event occurrence second time IVt2 in which the event occurrence standard time IVts is corrected to the time measured by the second timer unit 33 by the following equation (2).

IVt2 = IVts + K2s (2)
Where IVt2: event occurrence second time, IVts: event occurrence standard time, K2s: second correction value.

  The second display control unit 36 determines when the time measured TIM2 of the second time measuring unit 33 is β (for example, 3 seconds) before the event occurrence second time IVt2 (based on the event occurrence second time of the present invention). (Corresponding to the set event start notification time), on the second display 37, a display “corresponding to the display according to the event of the present invention” that “the song of singer A starts after β seconds” is displayed. To do. With this display (preliminary notification display), the user can be made to recognize in advance the timing at which the mobile terminal 30a starts singing.

  Then, when the timing time TIM2 of the second timing unit 33 becomes the event occurrence second time IVt2 (corresponding to the event start notification time set based on the event occurrence second time of the present invention), the second time is reached. The display control unit 36 displays on the second display 37 “Let's sing with singer A” (corresponding to a singing start display, a display corresponding to the event of the present invention).

  Here, the singing start display is made when the time counting TIM2 of the second timing unit 33 becomes the event occurrence second time IVt2 (TIM2 = IVt2). At this time, the standard time TIMs is the event occurrence standard time IVts. It becomes. In the television 10a, when the standard time TIMs becomes the event occurrence standard time IVts (when the time keeping time TIM1 of the first timing unit 14 becomes the event occurrence first time IVt1), the singer appears on the first display 19. The display of the song A is started.

  Therefore, in the portable terminal 30a, when the advance notification display and the singing start display are made on the second display 37, when the display of the singer A on the first display 19 of the television 10a is started, for example, It is possible to synchronize with high accuracy within an error range of about several tens of milliseconds.

  When the user who recognizes the singing start display starts singing, the singing level evaluation unit 38 collects the singing voice by the microphone 39, evaluates the singing power (singing level), and displays the evaluation result on the second display. 37. In this case, since the singing start time of the singer A displayed on the display 19 of the television 10a is accurately recognized on the mobile terminal 30a side, the singing level evaluation unit 38 is synchronized with the singing start time of the singer A. The evaluation of the singing ability of the user can be started.

  In addition, you may make it acquire the data required for evaluation of singing ability from a predetermined server via the network 60 by the 2nd network communication part 31. FIG. Moreover, the evaluation result data by the singing level evaluation unit 38 may be transmitted to the television 10a, and the evaluation result may be displayed on the display 19 of the television 10a.

[Second Embodiment]
Next, a second embodiment will be described with reference to FIGS. In addition, about the structure similar to 1st Embodiment mentioned above, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  Referring to FIG. 3, the time synchronization system of the second embodiment includes a television 10b (corresponding to the first display device of the present invention) and a portable terminal 30b (corresponding to the second display device of the present invention). It is configured. The television 10b and the portable terminal 30b use the time measured by the first time measuring unit 14 of the television 10b as a common time. Therefore, unlike the first embodiment, the television 10b includes a first common time acquisition unit 13 (see FIG. 1) that acquires time data of standard time from the standard time server 70 (see FIG. 1), and a first clocking unit 14. The first correction value calculation unit 15 (see FIG. 1) for calculating a first correction value for correcting the time measurement time to the standard time is not provided.

  Similarly, the portable terminal 30b also corrects the standard time to the time measured by the second time measuring unit 33, and the second common time acquiring unit 32 that acquires standard time data from the standard time server 70 (see FIG. 1). The second correction value calculation unit 34 (see FIG. 1) for calculating the second correction value is not provided.

  In addition, the mobile terminal 30b accesses the first timekeeping unit 14 of the television 10b via the network 60 by the second network communication unit 31, and acquires the timekeeping time data of the first timekeeping unit 14. 40 and a third correction value calculation unit 41 that calculates a third correction value for correcting the time measured by the first time measuring unit 14 to the time measured by the second time measuring unit 33. The CPU provided in the portable terminal 30b functions as the first clock time acquisition unit 40 and the third correction value calculation unit 41 by executing a control program held in the memory.

  The event occurrence transmission unit 17b of the television 10b is different from the event occurrence transmission unit 17a (see FIG. 1) of the television 10a in the configuration of event occurrence notification data to be transmitted. Due to this difference, the event occurrence second time recognition process by the event occurrence second time recognition unit 35b of the portable terminal 30b is also the event occurrence second time recognition unit 35a (FIG. 1) of the portable terminal 30a of the first embodiment. It is different from reference).

  Next, referring to FIG. 4, when a song program broadcast is displayed on the first display 19 of the television 10b, the time at which a specific song sung by a specific singer A (play of a predetermined song) is started. A series of processes for performing a display prompting the user to start singing on the second display 37 of the portable terminal 30b will be described in synchronization with the above.

  First, processing on the television 10b side will be described. The event occurrence transmission unit 17b transmits event occurrence notification data IVinfb including data of the event occurrence first time IVt1 to the mobile terminal 30b via the network 60 by the first network communication unit 12 (see FIG. 3).

  Next, processing on the mobile terminal 30b side will be described. The portable terminal 30b performs processing for using the time measured by the first time measuring unit 14 as a common time with the television 10b. The first timekeeping time acquisition unit 40 (see FIG. 3) accesses the first timekeeping unit 14 of the television 10b via the network 60 by the second network communication unit 31 (see FIG. 3). Timekeeping time data is acquired (first timekeeping time acquisition process).

  Specifically, the first time measurement time acquisition unit 40 requests the television 10b to transmit the time measurement data of the first time measurement unit 14 (the current time data of the first time measurement unit 14). The data is transmitted to the television 10b via the network 60 by the second network communication unit 31. Then, the second network communication unit 31 receives the third clock time data transmitted via the network 60 from the television 10b that has received the third time request data.

  The third correction value calculator 41 receives the third request transmission time TIM31 that is the time of the second timer 33 when the third time request data is transmitted to the television 10b, and the third timer data from the television 10b. It recognizes the third response reception time TIM32 which is the time measurement time of the second time measurement unit 33 at the time.

  Then, the third correction value calculation unit 41 receives the intermediate time TIM33 (= TIM31 + (TIM32−TIM31) / 2) between the third request transmission time TIM31 and the third response reception time TIM32 and the third time measurement time data. A time difference ΔT12a (= TIM33−TIM1) from the indicated time (the time measured by the first time measuring unit 14) TIM1 is calculated.

  The third correction value calculating unit 41 calculates a third correction value K12a for converting the time measured TIM2 of the second time measuring unit 33 into the time measured TIM1 of the first time measuring unit 14 based on the time difference ΔT12a. Here, the third correction value calculation unit 41 receives the third clock time data (the clock time data of the first clock unit 14) by the first clock time acquisition process, and receives the third response from the third request transmission time TIM31. A process of calculating a time difference ΔT12a between the intermediate time TIM33 until the reception time TIM32 and the time TIM1 indicated by the third time measurement time data is executed a plurality of times. Then, the third correction value calculation unit 41 calculates the average value of the obtained plurality of time differences ΔT12a as the third correction value K12a.

  Here, when the communication status between the television 10b and the portable terminal 30b is good and the communication delay time is short, the difference between the third request transmission time TIM31 and the time TIM1 indicated by the third time measurement data (third outgoing communication). The difference ΔTgb3 between the time) Tg3 and the difference (third return communication time) Tb3 between the third response reception time TIM32 and the time TIM1 indicated by the third time measurement time data becomes small.

  Therefore, the time difference ΔTgb3 between the corresponding third outgoing communication time Tg3 (at the time of calculation) and the third return communication time Tb3 is preferentially selected from the calculated time differences ΔT12a. By obtaining the average value, the accurate third correction value K12a can be obtained. The selection of the time difference ΔT12a may be performed in the same manner as the calculation procedure of the first correction value K1s by the first correction value calculation unit 15 described above.

  The event occurrence second time recognition unit 35b is included in the event occurrence notification data IVinfb when the second network communication unit 31 (see FIG. 1) receives the event occurrence notification data IVinfb from the television 10b via the network 60. The event occurrence first time IVt1 is recognized from the data.

  Then, the event occurrence second time recognition unit 35b calculates the event occurrence second time IVt2 by correcting the event occurrence first time IVt1 to the time measurement time of the second timer unit 33 by the following equation (3).

IVt2 = IVt1-K12a (3)
However, IVt2: event occurrence second time, IVt1: event occurrence first time, K12a: third correction value.

  In this way, by recognizing the event occurrence second time IVt2 on the mobile terminal 30b side, in the mobile terminal 30b, on the second display 37, the advance notification display and the event occurrence second time IVt2 are recognized. The time point when the singing start display is made can be synchronized with the time point when the singing of the singer A is started on the first display 19 of the television 10b. Moreover, the singing level evaluation part 38 can start evaluation of a user's singing ability synchronizing with the singer A's singing start time.

[Third Embodiment]
Next, a third embodiment will be described with reference to FIGS. In addition, about the structure similar to 1st Embodiment mentioned above, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  Referring to FIG. 5, the time synchronization system of the third embodiment includes a television 10c (corresponding to the first display device of the present invention) and a portable terminal 30c (corresponding to the second display device of the present invention). It is configured. The television 10c and the mobile terminal 30c use the time measured by the second time measuring unit 33 of the mobile terminal 30c as a common time. Therefore, the television 10c corrects the time measured by the first common time acquisition unit 13 (see FIG. 1) and the first time measurement unit 14 to obtain standard time from the standard time server 70 (see FIG. 1). The first correction value calculation unit 15 (see FIG. 1) for calculating the first correction value for the purpose is not provided.

  Similarly, the portable terminal 30c also has a second common time acquisition unit 32 (see FIG. 1) that acquires standard time data from the standard time server 70 (see FIG. 1), and a standard time is measured by the second time measuring unit 33. The second correction value calculation unit 34 (see FIG. 1) for calculating the second correction value for correcting to is not provided.

  In addition, the television 10 c uses the first network communication unit 12 to access the second time measuring unit 33 of the portable terminal 30 c via the network 60 and acquire the time measuring time data of the second time measuring unit 33. 20 and a fourth correction value calculating unit 21 for calculating a fourth correction value for correcting the time measured by the first time measuring unit 14 to the time measured by the second time measuring unit 33. I have. The CPU provided in the television 10c functions as the second clock time acquisition unit 20 and the fourth correction value calculation unit 21 by executing the control program stored in the memory.

  The event occurrence transmission unit 17c of the television 10c is configured such that the event generation data to be transmitted has the above-described event generation transmission unit 17a (see FIG. 1) of the first embodiment and the event generation transmission unit 17b of the second embodiment (FIG. 3). Is different from (see). Due to this difference, the event occurrence second time recognition process by the event occurrence second time recognition unit 35c of the portable terminal 30c is the event occurrence second time recognition unit 35a (see FIG. 1) of the first embodiment and the This is different from the event occurrence second time recognition unit 35b (see FIG. 3) of the second embodiment.

  Next, referring to FIG. 6, when a song program broadcast is displayed on the first display 19 of the television 10c, the first of the mobile terminal 30c is synchronized with the time when the singing by a specific singer is started. A series of processes for displaying on the 2 display 37 prompting the user to start singing will be described.

  First, processing on the television 10c side will be described. The television 10c performs processing for using the time measured by the second time measuring unit 33 as a common time with the portable terminal 30c. The second clock time acquisition unit 20 (see FIG. 5) acquires the clock time data of the second clock unit 33 of the mobile terminal 30c via the network 60 by the first network communication unit 12 (see FIG. 5) (first clock). 2 timekeeping time acquisition process).

  Specifically, the second clock time acquisition unit 20 requests the portable terminal 30c to transmit the clock time data of the second clock unit 33 (the current time data of the second clock unit 33). The request data is transmitted to the portable terminal 30 c via the network 60 by the first network communication unit 12. Then, the first network communication unit 12 receives the fourth clock time data transmitted via the network 60 from the portable terminal 30c that has received the fourth time request data.

  The fourth correction value calculation unit 21 receives the fourth request transmission time TIM41 that is the time of the first timekeeping unit 14 at the time when the fourth time request data is transmitted to the mobile terminal 30c, and the fourth timekeeping time data from the mobile terminal 30c. It recognizes the fourth response reception time TIM42 which is the time measurement time of the first time measurement unit 14 at the time of reception.

  Then, the fourth correction value calculation unit 21 receives the intermediate time TIM43 (= TIM41 + (TIM42−TIM41) / 2) between the fourth request transmission time TIM41 and the fourth response reception time TIM42, and the fourth time measurement time data. A time difference ΔT12b (= TIM43−TIM2) from the indicated time (timed time of the second timekeeping unit 33) TIM2 is calculated.

  Based on the time difference ΔT12b, the fourth correction value calculation unit 21 calculates a fourth correction value K12b for converting the time measurement TIM1 of the first time measurement unit 14 into the time measurement TIM2 of the second time measurement unit 33. Here, the fourth correction value calculation unit 21 receives the fourth clock time data (the clock time data of the second clock unit 33) by the second clock time acquisition process, and receives the fourth response from the fourth request transmission time TIM41. The process of calculating the time difference ΔT12b between the intermediate time TIM43 up to the reception time TIM42 and the time TIM2 indicated by the fourth time measurement data is executed a plurality of times. Then, the fourth correction value calculation unit 21 calculates the average value of the obtained plurality of time differences ΔT12b as the fourth correction value K12b.

  Here, when the communication status between the television 10c and the portable terminal 30c is good and the communication delay time is short, the difference between the fourth request transmission time TIM41 and the time TIM2 indicated by the fourth time measurement time data (fourth forward communication). The difference ΔTgb4 between the time) Tg4 and the difference (fourth return communication time) Tb4 between the fourth response reception time TIM42 and the time TIM2 indicated by the fourth timekeeping time data becomes small.

  Therefore, the time difference ΔTgb4 between the corresponding (during calculation) fourth forward communication time Tg4 and the fourth return communication time Tb4 is preferentially selected from the calculated time differences Δ12b. By obtaining the average value, the fourth correction value K12b with high accuracy can be obtained. The selection of the time difference ΔT12b may be performed in the same manner as the calculation procedure of the first correction value K1s by the first correction value calculation unit 15 described above.

  The event occurrence transmission unit 17c calculates the event occurrence second time IVt2 obtained by correcting the event occurrence first time IVt1 to the time measurement time of the second time measurement unit 33 by the following equation (5).

IVt2 = IVt1-K12b (5)
However, IVt2: event occurrence second time, IVt1: event occurrence first time, K12b: fourth correction value.

  Then, the event occurrence transmission unit 17c transmits the event occurrence notification data IVinfc including the data of the event occurrence second time IVt2 to the mobile terminal 30c via the network 60 by the first network communication unit 12.

  Next, processing on the mobile terminal 30c side will be described. The event occurrence second time recognition unit 35c is included in the event occurrence notification data IVinfc when the second network communication unit 31 (see FIG. 5) receives the event occurrence notification data IVinfc from the television 10c via the network 60. The event occurrence second time IVt2 is recognized from the data.

  In this way, by recognizing the event occurrence second time IVt2 on the portable terminal 30c side, in the portable terminal 30c, the above-mentioned thing is displayed on the second display 37 as in the first embodiment and the second embodiment described above. The point in time when the previous notification display and the singing start display are made can be synchronized with the point in time when the display of the singer A on the first display 19 of the television 10c is started. Moreover, the singing level evaluation part 38 can start evaluation of a user's singing ability synchronizing with the singer A's singing start time.

[4. Other Embodiments]
In the first to third embodiments described above, the event of the present invention is a singing by a specific singer, and the display corresponding to this event on the mobile terminal is an example of prompting the user to sing. However, other events include the following.

  (4-1) The event displayed on the television is a commercial of a product or service, and the display on the mobile terminal corresponding to the event is supplement or additional information of the product or service. The broadcast time of commercials is short (15 seconds, etc.). In order to control the display of the mobile terminal by limiting within this short time, the local time of the TV and the mobile terminal (timed separately by the TV and the mobile terminal). The process of synchronizing the time) is effective.

  (4-2) The event displayed on the television is a quiz program, and the display of the mobile terminal corresponding to the event is reception of an answer to the quiz problem. A process for synchronizing the local time of the television and the portable terminal is effective in accurately responding to the quick-press quiz and accepting the deadline for receiving the answer.

  (4-3) The event displayed on the television is a game, and the display of the mobile terminal corresponding to the event is an operation (flick operation or the like) of the mobile terminal for proceeding with the game. In order to create a sense of unity between the game image displayed on the display of the TV and the operation of the mobile terminal by the user, it is effective to synchronize the local time of the TV and the mobile terminal.

  In the first to third embodiments, the televisions 10a to 10c are shown as the first display device of the present invention, and the mobile terminals 30a to 30c are shown as the second display device of the present invention. If the display device has a display function, the present invention can be applied as the first display device and the second display device.

  The calculation of the first correction value K1s, the second correction value K2s, the third correction value K12a, and the fourth correction value K12b is preferably performed immediately before the occurrence of the event.

  In the first to second embodiments, the mobile device 30 (30a, 30b, 30c) side sets the event occurrence second time IVt2-β to the time when the prior notification display is performed (event occurrence second). Although the time IVt2-β) is set, the time at which the advance notification display is performed may be set as the event occurrence time on the television 10 (10a, 10b, 10c) side.

  10 (10a, 10b, 10c) ... TV, 11 ... Broadcast receiving unit, 12 ... First network communication unit, 13 ... First common time acquisition unit, 14 ... First timing unit, 15 ... First correction value calculation unit, 16: Event occurrence first time recognition unit, 17 (17a, 17b, 17c) ... Event generation transmission unit, 18 ... First display control unit, 19 ... First display, 20 ... Second time measurement acquisition unit, 21 ... First 4 correction value calculation unit, 30 (30a, 30b, 30c) ... mobile terminal, 31 ... second network communication unit, 32 ... second common time acquisition unit, 33 ... second timing unit, 34 ... second correction value calculation unit , 35 (35a, 35b, 35c) ... event occurrence second time recognition unit, 36 ... second display control unit, 37 ... second display, 38 ... singing level evaluation unit, 39 ... microphone, 60 ... network, 70 ... standard time server.

Claims (9)

A time synchronization system that performs display in which time is synchronized between a first display device and a second display device,
The first display device includes:
A first display unit;
A first timing unit;
A first network communication unit for performing communication via a network;
A first display control unit for controlling display of the first display unit;
A first common time acquisition unit for executing a first common time acquisition process of accessing the common time measurement unit via the network by the first network communication unit and acquiring data of a time measurement time of the common time measurement unit;
In the first common time acquisition process, the first common time acquisition unit transmits the first time request data for requesting the time measurement data of the common time measurement unit to the common time measurement unit. The first common time acquisition unit has received the first time measurement data transmitted from the common time measurement unit in response to the transmission of the first time request data from the first request transmission time which is the time measurement time of the time measurement unit. Based on the time difference between the intermediate time until the first response reception time, which is the time measurement time of the first time measurement unit, and the time indicated by the first time measurement time data, the time measurement time of the first time measurement unit is determined. A first correction value calculating unit that calculates a first correction value to be corrected and converted to a time measured by the common time measuring unit;
An event occurrence first time recognizing unit for recognizing a time measured by the first time measuring unit at which a predetermined event is displayed on the first display unit as an event occurrence first time;
The event occurrence common time is calculated by converting the event occurrence first time to the time measured by the common timekeeping unit using the first correction value, and the event occurrence notification data including the event occurrence common time data is An event transmission unit that transmits to the second display device via the network by a first network communication unit;
The second display device
A second display;
A second timing unit;
A second network communication unit for communicating via the network;
A second common time acquisition unit that executes a second common time acquisition process for accessing the common time measurement unit via the network and acquiring the time measurement data of the common time measurement unit by the second network communication unit;
In the second common time acquisition process, the second common time acquisition unit transmits the second time request data for requesting the time measurement data of the common time measurement unit to the common time measurement unit. The second common time acquisition unit receives the second time measurement data transmitted from the common time measurement unit in response to the transmission of the second time request data from the second request transmission time which is the time measurement time of the time measurement unit. Based on the time difference between the intermediate time until the second response reception time that is the time measurement time of the second time measurement unit and the time indicated by the second time measurement data, the time measurement time of the second time measurement unit is calculated. A second correction value calculation unit that calculates a second correction value to be corrected and converted to the time measured by the common time measuring unit;
When the event occurrence notification data is received by the second network communication unit, the event occurrence common time recognized from the event occurrence notification data is measured by the second timing unit using the second correction value. An event occurrence second time recognition unit for recognizing the event occurrence second time corrected to the time;
A second display control unit that performs a display corresponding to the event on the second display unit when the time measured by the second time measuring unit reaches an event start notification time set based on the second event occurrence time And a time synchronization system. The time synchronization system according to claim 1,
The first correction value calculation unit executes the first common time acquisition process by the first common time acquisition unit, and an intermediate time between the first request transmission time and the first response reception time; A process of obtaining a time difference from the time indicated by the first time measurement time data is executed a plurality of times, and the corresponding first request transmission time and the first time measurement time data among the time differences obtained by the plurality of processes are A time difference in which a difference between a first outgoing communication time that is a difference between the times indicated and a first return communication time that is a difference between the corresponding first response reception time and the time indicated by the first time measurement time data is a short time. The time synchronization system is characterized in that the first correction value is calculated preferentially. In the time synchronization system according to claim 1 or 2,
The second correction value calculation unit executes the second common time acquisition process by the second common time acquisition unit, and an intermediate time between the second request transmission time and the second response reception time; A process of obtaining a time difference from the time indicated by the second time measurement time data is executed a plurality of times, and among the time differences obtained by the plurality of times of processing, the corresponding second request transmission time and the second time measurement time data are A time difference in which the difference between the second forward communication time, which is the difference between the times indicated, and the second return communication time, which is the difference between the corresponding second response reception time and the time indicated by the second time measurement time data, is short. The time synchronization system is characterized in that the second correction value is calculated preferentially. A time synchronization system that performs display in which time is synchronized between a first display device and a second display device,
The first display device includes:
A first display unit;
A first timing unit;
A first network communication unit for performing communication via a network;
A first display control unit for controlling display of the first display unit;
An event occurrence first time recognizing unit for recognizing a time measured by the first time measuring unit at which a predetermined event is displayed on the first display unit as an event occurrence first time;
An event occurrence notification unit that transmits event occurrence notification data including data of the event occurrence first time to the second display device via the network by the first network communication unit;
The second display device
A second display;
A second timing unit;
A second network communication unit for communicating via the network;
The second network communication unit accesses the first clocking unit of the first display device via the network and executes a first clocked time acquisition process for acquiring clocked time data of the first clocking unit. A first timing acquisition unit;
In the first time measurement time acquisition process, the first time measurement time acquisition unit transmits the third time request data requesting the time measurement data of the first time measurement unit to the first display device. The third clock time data transmitted from the second display device in response to the transmission of the third time request data by the first clock time acquisition unit from the third request transmission time which is the clock time of the second clock unit. On the basis of the time difference between the intermediate time until the third response reception time that is the time measurement time of the second time measurement unit and the time indicated by the third time measurement time data. A third correction value calculation unit that calculates a third correction value for correcting the time measurement time and converting it to the time measurement time of the second time measurement unit;
When the event occurrence notification data is received by the second network communication unit, the event occurrence first time recognized from the event occurrence notification data is determined using the third correction value of the second timing unit. An event occurrence second time recognition unit for recognizing the event occurrence second time corrected to the timekeeping time;
A second display control unit that performs a display corresponding to the event on the second display unit when the time measured by the second time measuring unit reaches an event start notification time set based on the second event occurrence time And a time synchronization system. The time synchronization system according to claim 4,
The third correction value calculation unit executes the first time measurement time acquisition process by the first time measurement time acquisition unit, and an intermediate time between the third request transmission time and the third response reception time; A process for obtaining a time difference from the time indicated by the third time measurement time data is executed a plurality of times, and among the time differences obtained by the plurality of processes, the corresponding third request transmission time and the third time measurement time data are A time difference in which the difference between the third forward communication time, which is the difference between the times indicated, and the third return communication time, which is the difference between the corresponding third response reception time and the time indicated by the third time measurement data, is short. A time synchronization system characterized in that the third correction value is calculated preferentially. A time synchronization system that performs display in which time is synchronized between a first display device and a second display device,
The first display device includes:
A first display unit;
A first timing unit;
A first network communication unit for performing communication via a network;
A first display control unit for controlling display of the first display unit;
The first network communication unit accesses the second clock unit included in the second display device via the network, and executes a second clock time acquisition process for acquiring clock time data of the second clock unit. A second timing acquisition unit;
In the second clock time acquisition process, the second clock time acquisition unit transmits the fourth time request data for requesting the clock time data of the second clock unit to the second display device. The fourth time measurement data transmitted from the first display device in response to the transmission of the fourth time request data from the fourth request transmission time that is the time measurement time of the first time measurement unit. On the basis of the time difference between the intermediate time until the fourth response reception time, which is the time measurement time of the first time measurement unit, and the time indicated by the fourth time measurement time data. A fourth correction value calculation unit for calculating a fourth correction value for correcting the time measurement time and converting it to the time measurement time of the first time measurement unit;
An event occurrence first time recognizing unit for recognizing a time measured by the first time measuring unit at which a predetermined event is displayed on the first display unit as an event occurrence first time;
An event occurrence notification including data of the event occurrence second time is calculated by calculating an event occurrence second time obtained by converting the event occurrence first time into the time measurement time of the second time measurement unit using the fourth correction value. An event occurrence transmission unit that transmits data to the second display device via the network by the first network communication unit;
The second display device
A second display;
The second timing unit;
A second network communication unit for communicating via the network;
An event occurrence second time recognition unit for recognizing the event occurrence second time from the event occurrence notification data when the second network communication unit receives the event occurrence notification data via the network;
A second display control unit that performs a display corresponding to the event on the second display unit when the time measured by the second time measuring unit reaches an event start notification time set based on the second event occurrence time And a time synchronization system. The time synchronization system according to claim 6,
The fourth correction value calculation unit performs the second time measurement processing by the second time measurement time acquisition unit, and an intermediate time between the fourth request transmission time and the fourth response reception time; A process for obtaining a time difference from the time indicated by the fourth time measurement time data is executed a plurality of times, and among the time differences obtained by the plurality of times, the corresponding fourth request transmission time and the fourth time measurement time data are A time difference in which the difference between the fourth forward communication time, which is the difference between the times indicated, and the fourth return communication time, which is the difference between the corresponding fourth response reception time and the time indicated by the fourth timekeeping time data, is short. The time synchronization system is characterized in that the fourth correction value is calculated preferentially. In the time synchronization system according to any one of claims 1 to 7,
The first display device is a television having a broadcast receiving unit for receiving broadcast data;
The event occurrence first time recognizing unit, when the first display control unit displays a song program on the first display unit based on broadcast data received by the broadcast receiving unit, Recognizing the event occurrence first time as performance as the event,
The second display control unit performs a display for informing the second display unit of the start of the performance of the predetermined song when the time measured by the second time measuring unit reaches the event start notification time. Time synchronization system. The time synchronization system according to claim 8,
The second display device includes a singing level evaluation unit that executes a process of inputting a user's singing voice and evaluating a singing level in synchronization with the second event occurrence time. system.

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