JP2007187505A - Time providing device, time acquiring device, and time communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a time information providing device, a time information acquiring device, and a time communication system capable of allowing the time of a timepiece inside the time information providing device to agree with the time of a timepiece inside the time information acquiring device. <P>SOLUTION: The time of a time providing means 1 is transmitted from the first communication means 6, and received by a communication means 8 of a time acquiring means 2. The time providing means 1 adds a processing time from taking-out of time data until transmission of the data, and the time acquiring means 2 adds a processing time from reception of the time data until correction of the data, to thereby remove an error of synchronization caused by the processing time. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an apparatus and a time communication system that provide and acquire time by radio.

As a conventional technique, communication is performed between a time information providing device having time information and a time information acquiring device that requires time information using a short-range wireless communication unit, and the time information providing device to the time information acquiring device. A technique for providing time information is disclosed (see Patent Document 1).
JP 2002-300640

  However, the conventional technology acquires the time data of the internal clock of the time information providing device, transmits the time data by the short-range wireless means, the time information acquisition device receives the time data, and converts the received time data into the received time data. Based on this, the time of the internal clock of the time information acquisition device is corrected. However, in the conventional technology, the time from when the time data is acquired from the internal clock of the time information providing device to transmission and the time from when the time data is received until the internal clock of the time information acquisition device is corrected Not considered. For this reason, the delayed time data is transmitted, and the time is corrected with the delayed time data. For example, if the internal clock of the time information providing device is counted between the time data acquisition and transmission, there is a problem that delayed time data is transmitted. Further, when the internal clock of the time information providing device is counted between the time data reception and the time adjustment of the internal clock of the time information acquisition device, the time is corrected based on the delayed time data. There is a problem.

  The present invention relates to a time information providing device in which time data transmitted from a time information providing device and time data counted by an internal clock of the time information providing device are synchronized, time data received by a time information acquisition device, and time information providing device The time information acquisition device that synchronizes with the time data counted by the internal clock, and the time communication system that synchronizes the time data transmitted by the time information providing device and the time data counted by the internal clock of the time information acquisition device To do.

  The time providing apparatus according to the present invention wirelessly communicates with a clock unit that counts time per unit time, a time acquisition unit that acquires time data from the clock unit, and another device, and transmits the time data to the other device. Communication means, a delay time storage means for storing a transmission delay time from when the time data is acquired until the time data is transmitted from the communication means, and a transmission time at which the time data is transmitted from the communication means. It has a configuration of having time calculation means for calculating based on the delay time and transmission time storage means for storing the transmission time, and transmitting the transmission time as time data from the communication means.

  In the present invention, the time data can be transmitted from the communication device when the time of the clock means is counted.

  Further, in the present invention, the time calculation means is configured to transmit when the time obtained by adding the transmission delay time to the time data exceeds the time of the clock means, at the next time count after the time obtained by adding the transmission delay time to the time data. It can be.

  Also, in the present invention, after the time data is transmitted from the communication means, the time of the other device is received, and the difference between the time of the other device and the time of the clock means is outside a predetermined error range. The time data can be transmitted again.

  In the present invention, the transmission of time data can be stopped when the number of times of transmission of time data exceeds a predetermined number.

  Further, in the present invention, when the clock means is corrected, when a request signal is output from the input means due to a time transmission request operation, or when a time transmission request is received from another device. It can be set as the structure which transmits time data from a communication means.

  Further, in the present invention, the second communication means for performing wireless communication with the base station connected to the reference clock synchronized with the reference time and receiving the time data, and the time correcting means for correcting the time of the clock means; , A delay time storage means for storing a delay time from when the second communication means receives the time data until the time adjustment means corrects the time of the clock means, and a correction time using the received time data and the delay time And a correction time storage means for storing the correction time, and the time correction means can be configured to correct the time of the clock means to the correction time.

  The time acquisition device of the present invention includes a clock unit that counts time per unit time, a communication unit that wirelessly communicates with another device and receives time data from another device, and the received time data from the communication unit. A reception time acquisition means for acquiring, a delay time storage means for storing a reception delay time from when the time data is received until the time of the clock means is corrected, and a correction time based on the received time data and the reception delay time And a time adjustment means for correcting the time of the clock means to the correction time.

  In the time acquisition device of the present invention, the time adjustment means can be configured to restart the count at a timing that the reception delay time is advanced from the time adjustment time of the clock means.

  In the present invention, a time acquisition unit that acquires time data from the clock unit, a delay time storage unit that stores a transmission delay time from when the time data is acquired until the time data is transmitted from the communication unit, and time calculation Means for calculating a transmission time based on the time data and the transmission delay time, and a transmission time storage means for storing the transmission time, and after correcting the time of the clock means, the communication means may send the transmission time as time data. It can be set as the structure transmitted to this apparatus.

  Moreover, in this invention, the time communication system which has the time provision apparatus of the said structure and a time acquisition apparatus can be comprised.

  As described above, according to the present invention, the accurate time can be transmitted from the time providing device, and the time acquisition device can receive the accurate time and correct the clock. The clock of the time acquisition device and the clock of the time providing device can be matched.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing the configuration of the time communication system of the present invention.

  The time communication system comprised by the radio | wireless station of the time provision apparatus 1, the time acquisition apparatus 2, and the base station 3 is represented.

  The reference clock 11 is a clock that counts time. The reference clock 11 is preferably an atomic clock in synchronization with the standard time. The base station 3 acquires time data from the reference clock 11 and transmits the time data to the time providing device 1 wirelessly. The second communication means 7 of the time providing device 1 receives time data from the base station 3. The time of the clock means 4 is corrected based on the received time. The time providing apparatus 1 acquires time data from the clock unit 4 and transmits time data from the first communication unit 6. The processing unit 5 manages the operation of the time providing device. The communication unit 8 receives the time data transmitted from the first communication unit 6. The time acquisition device 2 corrects the time of the clock means 10 based on the received time data. The processing unit 9 manages the operation of the time acquisition device 2.

  With this configuration, the time of the clock means 4 that is the internal clock of the time providing device 1 can be synchronized with the time of the reference clock 11. In addition, the time of the clock unit 10 that is the internal clock of the time acquisition unit 2 can be synchronized with the time of the clock unit 4 that is the internal clock of the time providing device 1. Further, the time of the clock means 10 that is the internal clock of the time acquisition apparatus 2 can be synchronized with the time of the reference clock 11 by synchronizing the time of the clock means 4 that is the internal clock of the time providing apparatus 1. it can. Here, without synchronizing with the time of the clock means 4 which is an internal clock of the time providing apparatus 1, the time information can be communicated via the time providing apparatus 1 and directly synchronized with the time of the reference clock 11.

  FIG. 2 is a block diagram showing the configuration of the time providing apparatus of the present invention.

  The time providing apparatus 1 includes a clock unit 4, a time correction unit 12, a time acquisition unit 13, a correction time storage unit 14, a time calculation unit 15, a delay time storage unit 16, a display unit 17, an input unit 18, a timer 19, and a reception time. The acquisition unit 20, the control unit 21, the transmission time storage unit 22, the first communication unit 6, and the second communication unit 7 are included. The first communication unit 6 includes a transmission unit 23, a selection unit 24, a reception unit 25, and an antenna 26. The time providing means 1 communicates with the time acquisition device 2 wirelessly. The time providing apparatus 1 communicates with the base station 3 connected to the reference clock 10 by radio.

  The clock means 4 counts the time. The time is counted every unit time. For example, the time is counted every unit time determined every second or every 0.1 second. The clock means 4 outputs the counted time to the time acquisition means 13 as time data. The time of the clock means 4 is corrected by the time correction means 12. The clock means 4 is controlled by the control means 21.

  The time acquisition unit 13 acquires time data from the clock unit 4. The time acquisition unit 13 is controlled by the control unit 21. The time acquisition unit 13 outputs the acquired data to the time calculation unit 15. The time adjustment means 12 is controlled by the control means 21.

  The time correction means 12 inputs the correction time stored in the correction time storage means 14 and corrects the time of the clock means 4 based on the correction time. Furthermore, the time correction means 12 also corrects the count timing of the clock means 4 using the delay time when the time correction means 12 corrects the time data from the base station 3. When the time data from the time acquisition device 2 is used for correction, the count timing of the clock means 4 is corrected using the reception delay time. Since the time when the communication means receives the time data is synchronized with the time count, it is performed to match the count of the clock means 4 with this timing. In addition, when the time of the clock means 4 is corrected, the timing that is earlier than the reception delay time is set as the time count timing. For example, when counting every second, if the reception delay time is 0.1 seconds, the count timing is reset once at the time of correction, and the timer that measures 0.9 seconds after subtracting the reception delay time from 1 second. Is started, the count timing is reset again after 0.9 seconds, and counting is performed every second from there. The timing of reception and the count timing of the clock means 4 can be synchronized.

  The correction time storage means 14 is controlled by the control means 21. The correction time storage unit 14 stores the correction time calculated by the time calculation unit 15. The correction time storage unit 14 outputs the stored correction time to the time correction unit 12.

  The delay time storage unit 16 stores the delay time, and the stored delay time is output to the time calculation unit 15. The delay time storage means 16 is controlled by the control means 21. The stored delay time includes a transmission delay time which is a time required for transmitting time data from the first communication means 6 after acquiring time data from the clock means 4 and a time when the first communication means 6 sets the time. The reception delay time, which is the time required for the time adjustment means 12 to correct the clock means 4 after receiving the data, and the time correction means 12 after the second communication means 7 receives the time data, Delay time, which is the time required to correct the error, and calculation delay, which is the time required from the time when the first communication means 6 receives the time data to the time calculation means 15 to calculate the reception time error It's time. This delay time is preferably measured and stored in advance.

  The time calculation means 15 is controlled by the control means 21. The time calculation means 15 calculates the correction time and the transmission time. There are two types of calculation of the correction time, when the time data from the time acquisition device 2 is used and when the time data from the base station 3 is used.

  First, a case where time data from the time acquisition device 2 is used will be described. Time data transmitted from the time acquisition device 2 is received by the first communication means 6, and time data is acquired by the reception time acquisition means 20. The acquired time data is output to the time calculation means 15. The time calculation means 15 acquires the reception delay time stored in the delay time storage means 16. The time calculation means 15 adds the reception delay time to the received time data to obtain a corrected time. The correction time and the reception delay time are output to the correction time storage means 14 and stored.

  Next, a case where time data from the base station 3 is used will be described. The time data transmitted from the base station 3 is received by the second communication unit 7, and the time data is acquired by the reception time acquisition unit 20. The acquired time data is output to the time calculation means 15. The time calculation means 15 acquires the reception delay time stored in the delay time storage means 16. The time calculation means 15 adds the reception delay time to the received time data to obtain a corrected time. The time calculation means 15 outputs the correction time and the reception delay time to the correction time storage means 14 for storage.

  Next, calculation of transmission time will be described. The time calculation means 15 inputs the time data acquired by the time acquisition means 13 and the transmission delay time of the delay time storage means 16, and adds the transmission delay time to the time data to obtain the time. The time of the next count after the obtained time is the transmission time. However, if the determined transmission time is equal to the time count, that time is the transmission time. This transmission time is stored in the transmission time storage means 22. However, when a new count is made by the time of transmission from the first communication means 6, the transmission time is the time of the next count after the obtained time.

  The display means 17 is controlled by the control means 21 and displays calculation results, data, time, success / failure of transmission / reception, error messages, character and numerical information, and the like. A liquid crystal display device or an EL display device is preferable.

  The input means 18 is controlled by the control means 21 and has a keyboard for inputting characters and operating instructions, and an input terminal for inputting control signals and data from the outside.

  The timer 19 is a timer that counts when a predetermined time is set and generates an interrupt when the predetermined time is counted. This is used to wait for the time until the start of processing when transmitting time data at the time count timing.

  When the first communication means 6 or the second communication means 7 receives time data, the reception time acquisition means 20 analyzes the received time data and converts it into digital data that can be processed by the control means 21.

  The transmission time storage unit 22 stores the time transmitted from the first communication unit 6. This time is the result calculated by the time calculation means 15. The first communication means 6 transmits at this time.

  The second communication means 7 is controlled by the control means 21, receives time data from the base station 3, and outputs the time data to the reception time acquisition means 20. The second communication means 7 is a wireless communication means capable of data communication, and is preferably a mobile phone communication device. Mobile phones can communicate not only voice but also data.

  The first communication unit 6 is a wireless communication unit that is controlled by the control unit 21 and performs data communication with the time acquisition device 2. Preferably, it is a short-range wireless communication device such as Bluetooth. The transmission means 23 converts the digital data handled by the control means 21 into wireless communication data, and transmits radio waves from the antenna 26 via the selection means 24. The antenna 26 receives radio waves and outputs an analog signal to the receiving means 25 via the selecting means 24. The receiving unit 23 converts the signal from the antenna 26 into digital data handled by the control unit 21 and outputs the digital data to the control unit 21. The selection means 24 selects which of the transmission means 23 and the reception means 25 is connected to the antenna 26 under the control of the control means 21.

  The control unit 21 controls the operation of each unit and controls the operation of the information providing apparatus 1. It has a CPU, ROM, and RAM. The CPU performs processing according to the program, and as a result, performs various controls and calculations. The ROM stores CPU control programs and setting values. A writable ROM such as a flash memory can also be used. The RAM stores temporary data, various setting values, calculation results, and calculation data for various processes.

  Here, the configuration of the time acquisition device 2 is a configuration in which the second communication means 7 that communicates with the base station 3 from the time supply device 1 is excluded. The time acquisition unit 2 can be configured in the same way as the time supply device 1.

  FIG. 3 is a diagram showing the timing of the operation of the present invention.

  This time axis represents the elapsed time of the clock means 4. Time elapses in the direction from t1 to t8. t1 to t4 and t4 to t7 are the same time interval. The clock means 4 is counted at t1, t4 and t7.

  Case 1 will be described. In the time providing device 1, the time is acquired and transmitted. This is a case where the transmission time calculated by the time calculation means 15 does not exceed the time count timing of the clock means 4. It is assumed that the time acquisition unit 13 acquires the time t2 from the clock unit 4 at the time t2. The transmission delay time 27 is T2. The time calculation means 15 calculates t2 plus T2. The transmission time t4 is obtained. Since the time t4 is simultaneous with the count of the clock means 4, the transmission time is t4.

  If the timing at which the time acquisition unit 13 acquires the time data from the clock unit 4 is between t1 and t2, even if the time T2 of the transmission delay time 27 is added, the time count of the clock unit 4 is not reached. The time is t4. If time data is acquired during time T1, the transmission time is t4. At this time, since transmission is performed at the timing t4 when the time is counted, it is necessary to provide a weight for the processing. By measuring and setting in advance the time required for processing, the processing start time can be determined, and the wait time can also be determined. This wait can be timed using a timer, or the time can be monitored and the processing can be started when a predetermined time is reached.

  In the time acquisition device 2, the time is acquired and the time is corrected. It is time t6 after the delay time 28 has elapsed since reception. The time calculation means 15 obtains a time t6 obtained by adding the reception delay time T4 to the reception time data t4 as a correction time. Then, the correcting means 12 sets the clock means 4 of the time acquisition device 2 at time t6. At this time, the time count is corrected by a delay time so as to start from the time of reception, and the count is restarted.

  Case 2 will be described. This is a case where the transmission time calculated by the time calculation means 15 exceeds the time count timing of the clock means 4. When the time acquisition means 13 acquires time between time t2 and time t4, as shown by the transmission time 31, if the transmission delay time T2 is added, the time t4 that is the count timing of the clock means 4 will be exceeded. . In such a case, the transmission time is t7, which is the time of the next count after the acquired time. Further, the correction process 29 calculates a suitable waiting time weight 30 and performs a process for applying the weight. Transmission processing is started at time t5 after the weight 30 has elapsed, and transmission time t7 is transmitted at time t7 after the transmission delay time 32 has elapsed.

  In the time acquisition device 2, the time is acquired and the time is corrected. It is time t8 after the delay time 33 has elapsed since reception. The time calculation means 15 obtains a time t8 obtained by adding the reception delay time T4 to the reception time data t7 as a correction time. Then, the correction means 12 sets the time of the clock means 4 of the time acquisition device 2 as time t8. At this time, the time count is corrected by a delay time so as to start from the time of reception, and the count is restarted.

  FIG. 4 is a sequence diagram between the time providing device and the time acquisition device of the present invention.

  The operation of the time providing device 1 is shown on the left side of the figure, and the operation of the time acquisition device 2 is shown on the right side of the figure. Since the configurations of the time providing device 1 and the time acquisition device 2 are the same, FIG. 2 is also used to describe the operation of the time providing device 1 and the operation of the time acquisition device 2.

  Time transmission / reception is performed when the time of the clock unit 4 of the time providing device 1 is corrected, when an operation of transmitting the time is performed by the input unit 18 of the time providing device 1, or the time acquisition device. 2 when the time transmission is requested by wireless communication, or when the second communication means communicates with the base station 3 to receive time data. At such a time, the time providing device 1 transmits the time to the time acquisition device 2.

  First, the time providing apparatus 1 performs time acquisition processing S1. The time acquisition process S <b> 1 is a process for acquiring time data from the clock unit 14 by the time acquisition unit 13.

  Next, a transmission time calculation process S2 is performed. In the transmission time calculation process S 2, first, the time calculation unit 15 acquires the time data acquired by the time acquisition unit 13 and the time data from the clock unit 4 stored in the delay time storage unit 16. A transmission delay time which is a time required for transmitting time data from the communication means 6 is input. Then, the transmission time is calculated, and the transmission time of the calculation result is stored in the transmission time storage means 22.

  Next, time transmission processing S3 is performed. The time transmission process S3 transmits the transmission time from the first communication means 6 at the transmission time. In order to transmit at the time count, a time weight is provided. The time at which this process should be started is set in advance by the control means 21, and when that time comes, an interrupt is generated and the process starts. When the process starts, a transmission data packet including the transmission time is created and output to the transmission means 23. Here, a predetermined time may be counted using the timer 19. In the transmission means 23, it converts into a radio signal and an electromagnetic wave is output from an antenna. At this time, the selection unit 24 connects the transmission unit 23 and the antenna 26. The timing output from the first communication means 6 is the transmission time. Time data is transmitted from the time providing device 1 to the time acquisition device 2.

  Next, processing on the time acquisition device 2 side is performed. Hereinafter, the process of the time acquisition device 2 will be described.

  First, time reception processing S4 is performed. In the time reception process S4, radio waves are received by the first communication unit 6, and time data is acquired by the reception time acquisition unit 20.

  Next, a reception time calculation process S5 is performed. The reception time calculation process S5 is a time required for the acquired time data and the first communication means 6 stored in the delay time storage means 16 to correct the clock means 4 after receiving the time data. The time calculation means 15 inputs the delay time and calculates the correction time. The correction time that is the calculation result is stored in the correction time storage means 14.

  Next, time correction processing S6 is performed. In the time adjustment process S 6, the time adjustment means 12 corrects the time of the clock means 4 to the correction time stored in the correction time storage means 14.

  The next process is a process in which the time acquisition device 1 transmits the corrected time to the time providing device 2 to check whether or not the corrected time is correct.

  Next, a time acquisition process S7 is performed. In the time acquisition process S7, time data of the time of the clock unit 4 is acquired by the time acquisition unit 13.

  Next, a transmission time calculation process S8 is performed. In the transmission time calculation process S8, first, the time calculation unit 15 acquires the time data acquired by the time acquisition unit 13 and the time data from the clock unit 4 stored in the delay time storage unit 16, and then the first communication. A transmission delay time which is a time required for transmitting time data from the means 6 is input. Then, the transmission time is calculated, and the transmission time of the calculation result is stored in the transmission time storage means 22.

  Next, a time transmission process S9 is performed. The time transmission process S9 transmits the transmission time from the first communication means 6 at the transmission time. In order to transmit at the timing of the time count, the time at which this process should be started is set in advance by the control means 21, and when that time comes, an interrupt is generated and the process starts. When the process starts, a transmission data packet including the transmission time is created and output to the transmission means. In the transmission means 23, it converts into a radio signal and an electromagnetic wave is output from an antenna. At this time, the selection unit 24 connects the transmission unit 23 and the antenna 26. The timing at which wireless output is performed from the first communication means 6 is the transmission time. Time data is transmitted from the time acquisition device 2 to the time providing device 1.

  Next, processing on the time providing device 1 side is performed. Hereinafter, the process of the time providing apparatus 1 will be described.

  First, time reception processing S10 is performed. In the time reception process S <b> 10, radio waves are received by the first communication unit 6, and time data is acquired by the reception time acquisition unit 20.

  Next, a reception time calculation process S11 is performed. The reception time calculation process S11 is performed until the time correction unit 12 corrects the clock unit 4 after the received time data and the first communication unit 6 stored in the delay time storage unit 16 receive the time data. The time calculation processing 15 inputs the reception delay time that is the time required, and calculates the correction time. The correction time that is the calculation result is stored in the correction time storage means 14.

  Next, reception time confirmation processing S12 is performed. In the reception time confirmation process S12, first, to the time calculation process 15, the time data of the clock means 4 acquired by the time acquisition means 13 and the correction time which is the time data of the time acquisition device 2 stored in the correction time storage means 14 are shown. The calculation delay time which is the time required from the time when the first communication means 6 stored in the data and the delay time storage means 16 receives the time data until the time calculation means 15 calculates the reception time error. Enter. Then, the time data is subtracted from the time obtained by adding the operation delay time to the corrected time data. If it does so, the time which subtracted the time of the time provision apparatus 1 from the time of the time acquisition apparatus 2 will be calculated | required. The obtained time is an error time.

  This error time is compared with the time of the error range stored in the predetermined ROM to determine whether or not the error range is acceptable. If it is within the allowable range, proceed to the next step. If it is outside the allowable range, it is determined whether it is within the range of the limit of the continuous allowable number of times stored in the ROM. If it is outside the allowable range more than the predetermined number of times, the time transmission process is stopped and an error message is displayed. In addition, the time acquisition device 2 is notified that it is out of the allowable range and is equal to or more than a predetermined number of times. If the predetermined number of times has not been reached, the process starts again from the time acquisition process S1. For example, the error time is set within 10 msec, and the predetermined number of times is set within 3 times. If it is within 10 ms, it is an error with no problem in normal use of the watch. The error range is set in advance such as a range determined by a standard or the like, a range that is not problematic for normal use, or a range that considers variations between devices. If this error range is exceeded, it can be determined that there is an abnormality in the apparatus. If the predetermined number of times seems to be wrong many times, it can be determined that there is some abnormality.

  Next, confirmation transmission processing S13 is performed. In the confirmation transmission process S13, if the difference between the time of the time acquisition device 2 and the time of the time providing device 1 is within a predetermined error range, a signal indicating that the time synchronization is successful is generated. If the difference between the two is outside the predetermined error range and the number of times outside the continuous range is equal to or greater than the predetermined number, the time synchronization failure / end signal is sent to the time of the time acquisition device 2 and the time of the time providing device 1. If the difference is outside the predetermined error range and the number of times outside the continuous range does not reach the predetermined number of times, the time synchronization failure and the transmission signal are transmitted to the time acquisition device 2 again. Then, the above result is displayed on the display means 17.

  Next, processing on the time providing device 2 side is performed. Hereinafter, the process of the time providing apparatus 2 will be described.

  First, confirmation reception processing S14 is performed. The confirmation reception process S <b> 14 receives a confirmation signal from the time providing apparatus 1. The received result is displayed on the display means 17.

  By performing the processing as described above, the time can be corrected from the time providing device 1 to the time acquisition device 2, and more accurate time correction can be performed by checking the result. It can also be determined that some abnormality has occurred in the apparatus.

It is a block diagram showing the structure of the time communication system of this invention. It is a block diagram showing the structure of the time provision apparatus of this invention. It is the figure which showed the timing of the operation | movement of this invention. It is a sequence diagram between the time provision apparatus of this invention, and a time acquisition apparatus.

Explanation of symbols

1 Time providing device 2 Time obtaining device

Claims (11)

A clock means for counting time per unit time;
Time acquisition means for acquiring time data from the clock means;
A communication means for performing wireless communication with another device and transmitting the time data to the other device;
A delay time storage means for storing a transmission delay time from when the time data is acquired until the time data is transmitted from the communication means;
Time calculation means for calculating a transmission time for transmitting time data from the communication means based on the time data and the transmission delay time;
Transmission time storage means for storing the transmission time;
Have
The time providing apparatus, wherein the transmission means transmits the transmission time as the time data.   2. The time providing apparatus according to claim 1, wherein the time data is transmitted from the communication apparatus when the time of the clock means is counted.   When the time obtained by adding the transmission delay time to the time data exceeds the time of the clock means, the time calculation means transmits the time at the next time count after the time obtained by adding the transmission delay time to the time data. The time providing apparatus according to claim 2.   After the transmission of the time data from the communication means, the time of the other device is received, and the difference between the time of the other device and the time of the clock means is outside a predetermined error range, The time providing apparatus according to claim 1, wherein the time data is transmitted again.   5. The time providing apparatus according to claim 4, wherein transmission of the time data is stopped when the number of times of transmission of the time data exceeds a predetermined number.   From the communication unit when the clock unit is corrected, when a request signal is output from the input unit due to a time transmission request operation, or when there is a time transmission request from the other device 6. The time providing apparatus according to claim 1, wherein the time data is transmitted. A clock means for counting time per unit time;
A communication means for performing wireless communication with another device and receiving time data from the other device;
Receiving time acquisition means for acquiring received time data from the communication means;
A delay time storage means for storing a reception delay time from when the time data is received until the time of the clock means is corrected;
Time calculating means for calculating a correction time based on the received time data and the reception delay time;
Time correction means for correcting the time of the clock means to the correction time;
A time acquisition device comprising:   8. The time acquisition apparatus according to claim 7, wherein the time correction unit restarts the counting at a timing that is earlier than the time correction by the reception delay time from the time correction. Time acquisition means for acquiring time data from the clock means;
A delay time storage means for storing a transmission delay time from when the time data is acquired until the time data is transmitted from the communication means;
The time calculating means calculates a transmission time based on the time data and the transmission delay time, and stores a transmission time storage means for storing the transmission time;
Have
9. The time acquisition apparatus according to claim 7, wherein after the time of the clock means is corrected, the transmission means transmits the transmission time as time data to the other apparatus. A second communication means for performing wireless communication with a base station connected to a reference clock synchronized with a reference time and receiving time data;
Time correction means for correcting the time of the clock means;
A delay time storage means for storing a delay time from when the second communication means receives the time data until the time correction means corrects the time of the clock means;
Time calculating means for calculating a correction time based on the received time data and the delay time;
Correction time storage means for storing the correction time;
Have
2. The time providing apparatus according to claim 1, wherein the time correction means corrects the time of the clock means to the correction time.   It has the said time provision apparatus in any one of Claims 1-6, or Claim 10, and the said time acquisition apparatus in any one of Claims 7-9, The said time provision apparatus A time communication system, wherein the time acquisition device receives the time data, and corrects the time of the time acquisition device to the time of the time providing device.

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