JP2012122732A - Time correcting system, time transmitting device, time receiving device and time correcting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a time correcting system capable of transmitting and receiving time data from one device to another device between the devices for transmitting/receiving communication data for every prescribed time interval and accurately correcting the time of the other device, as well as a time transmitting device and a time receiving device for the system, and a time correcting method.SOLUTION: A time transmitting device creates transmission data including time correction data that is formed by adding, to current time data, a processing time Ta required when reading the current time data and creating the transmission data, and a waiting time Tb until a next data transmission, and transmits the transmission data at transmission timing for every prescribed time interval. A time receiving device calculates a correction time formed by adding a processing time Tc required from receiving the transmission data until correcting timekeeping data, to a time indicated by the time correcting data, and corrects the timekeeping data to the correction time.

Description

  The present invention relates to a time transmission device, a time reception device, a time correction system, and a time correction method that communicate with each other at predetermined time intervals.

  There is a system that corrects the time of the other device by transmitting current time data from one device to the other device between devices that perform data communication with each other (see, for example, Patent Document 1).

JP 2010-019566 A

  Data communication methods include not only a method in which communication data is immediately transmitted / received in response to a communication request, but also a method in which communication data is transmitted / received at predetermined time intervals. In the latter method, when the current time data is transmitted from one device to the other device to correct the time, the accuracy of the time correction depends on the size of the time interval of data communication unless there is any ingenuity. There is a problem of end.

  An object of the present invention is to provide a time adjustment system capable of accurately correcting the time of one device by transmitting / receiving time data between devices performing transmission / reception of communication data at predetermined time intervals, the time transmitting device, and the time To provide a receiving device and a time correction method.

In order to achieve the above object, the invention according to claim 1
In a time correction system including a time transmission device and a time reception device that communicate with each other at a predetermined time interval,
The time transmitter is
Current time data storage means for storing current time data;
Data creation means for creating transmission data including time correction data in which at least a waiting time until the next data transmission is added to the current time data;
Transmission data storage means for storing transmission data created by the data creation means;
Transmission means for transmitting the transmission data stored in the transmission data storage means at a transmission timing for each predetermined time interval;
With
The time receiving device is:
A time counting means for counting the current time;
Time correction means for correcting the time measurement data of the time measurement means based on the time of the time correction data when the transmission data including the time correction data is received;
It is characterized by having.

The invention according to claim 2 is the time correction system according to claim 1,
The transmission data creation means includes
Further, the present invention is characterized in that transmission data including the time correction data to which processing time required for generating the transmission data by reading the current time data from the current time data storage means is created.

The invention according to claim 3 is the time correction system according to claim 1 or 2,
In the time receiving device,
When the transmission data including the time correction data is received, the processing time taken from the reception of the transmission data to the correction of the time data of the time measuring means at the time indicated by the time correction data is Time calculating means for calculating the correction time by adding,
The time correction means includes
The time measuring means is corrected at the correction time calculated by the time calculating means.

The invention according to claim 4
In a time transmitter that communicates with a time receiver at a predetermined time interval,
Current time data storage means for storing current time data;
Time correction data in which the current time data is added with a processing time taken when the current time data is read from the current time data storage means to create transmission data and a waiting time until the next data transmission is added. A data creation means for creating the transmission data;
Transmission data storage means for storing transmission data created by the data creation means;
Transmission means for transmitting the transmission data stored in the transmission data storage means at a transmission timing for each predetermined time interval;
It is characterized by having.

The invention according to claim 5
In a time receiving device that communicates with a time transmitting device at a predetermined time interval,
A time counting means for counting the current time;
When the transmission data including the time correction data is received, the processing time taken from the reception of the transmission data to the correction of the time data of the time measuring means at the time indicated by the time correction data is A time calculation means for calculating a correction time by adding, and
Time correcting means for correcting the time measuring means at the correction time calculated by the time calculating means;
It is characterized by having.

The invention described in claim 6
A time correction method for correcting time measurement data of the time reception device based on current time data of the time transmission device using a time transmission device and a time reception device that communicate with each other at a predetermined time interval,
The time transmitting device is
While creating the transmission data including the time correction data to which the processing time required for reading the current time data and creating the transmission data and the waiting time until the next data transmission are added to the current time data,
This transmission data is transmitted at the transmission timing for each predetermined time interval,
The time receiving device is
When the transmission data including the time correction data is received, the processing time required from the reception of the transmission data to the correction of the time measurement data is added to the time indicated by the time correction data. While calculating the correction time,
The clock data is corrected at the correction time.

  According to the present invention, in the time transmitting device and the time receiving device that perform communication at predetermined time intervals, there is an effect that the time of the time receiving device can be accurately corrected based on the current time data of the time transmitting device.

It is a block diagram which shows the principal part of the time correction system of embodiment of this invention. It is a flowchart which shows the control procedure of the time transmission process performed by CPU of a master apparatus. It is a flowchart which shows the control procedure of the time reception process performed by CPU of a slave apparatus. It is a sequence diagram which shows the flow of the time transmission process of a master apparatus, and the time reception process of a slave apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a main part of a time correction system according to an embodiment of the present invention.

  The time adjustment system of this embodiment includes a master device (for example, a mobile phone) 100 as a time transmitting device and a slave device (for example, a wristwatch) 200 as a time receiving device, and is based on the internal time of the master device 100. The time of the slave device 200 is corrected by wireless communication.

  As shown in FIG. 1, the master device 100 includes a control processing unit (for example, a microcomputer) 110 that performs device control processing and a communication processing unit (for example, a wireless IC) 120 that performs wireless communication processing. . The control processing unit 110 includes a CPU (Central Processing Unit) 111 that performs arithmetic processing, a ROM (Read Only Memory) 112 that stores control programs and control data executed by the CPU 111, and a working memory space for the CPU 111. A RAM 113 to be provided, a clock (current time data storage means) 114 that counts the current time inside, a serial interface 115 that inputs and outputs data for wireless communication, and the like are provided.

  The communication processing unit 120 of the master device 100 is a module that performs communication processing in accordance with, for example, a Bluetooth (registered trademark) communication standard. The communication processing unit 120 temporarily stores transmission data, an RF unit 121 that performs transmission / reception of radio waves via the antenna ANT, a link controller 122 that performs data processing and transmission / reception timing control according to a Bluetooth communication protocol, and the like. A transmission buffer (transmission data storage means) 123, a reception buffer 124 for temporarily storing reception data, a serial interface 125 for inputting / outputting data to be transmitted / received, and the like. The RF unit 121, the link controller 122, and the like constitute transmission means.

  The slave device 200 is provided with a control processing unit (for example, a microcomputer) 210 that performs control processing of the device and a communication processing unit (for example, a wireless IC) 220 that performs wireless communication processing. The control processing unit 210 includes a CPU (Central Processing Unit) 211 that performs arithmetic processing, a ROM (Read Only Memory) 212 that stores control programs and control data executed by the CPU 211, and a working memory space for the CPU 211. A RAM 213 to be provided, a clock (counting means) 214 that internally counts the current time, a serial interface 215 that inputs and outputs data for wireless communication, and the like are provided.

  The communication processing unit 220 of the slave device 200 is a module that performs communication processing in accordance with, for example, the Bluetooth communication standard. The communication processing unit 220 temporarily stores transmission data, an RF unit 221 that performs transmission / reception of radio waves via the antenna ANT, a link controller 222 that performs data processing and transmission / reception timing control according to a Bluetooth communication protocol, and the like. A transmission buffer 223, a reception buffer 224 for temporarily storing received data, a serial interface 225 for inputting / outputting data to be transmitted / received, and the like.

  The master device 100 and the slave device 200 perform wireless communication with each other in one communication mode of the Bluetooth standard, for example, by the processing of the communication processing units 120 and 220. In this communication mode, after a communication link is established, radio waves are transmitted and received at a specified time interval (for example, 1.0 second), and data communication is performed during other periods. In this way, low operating power is realized.

  Master device 100 (mobile phone) performs wireless communication with a cellular radio base station by another communication processing unit (not shown) to acquire accurate time information, or connects to a communication network via the radio base station. And accurate time information can be acquired. For this reason, it is possible to cause the clock 114 of the master device 100 to count a relatively accurate current time by frequently acquiring accurate time information and correcting the time measurement data of the clock 114.

  Next, the operation of time correction processing by the master device 100 and the slave device 200 having the above-described configuration will be described.

  The time adjustment process is executed in either of the master device 100 and the slave device 200 when a time correction request is made and the start of the time adjustment process is notified from one to the other by wireless communication.

  When the time adjustment process is started, the master apparatus 100 starts the time transmission process for transmitting the time correction data by the CPU 111, while the slave apparatus 200 executes the time reception process for receiving the time correction data by the CPU 211. The

  2 is a flowchart of time transmission processing executed by the CPU 111 of the master device 100, FIG. 3 is a flowchart of time reception processing executed by the CPU 211 of the slave device 200, and FIG. FIG. 4 is a sequence diagram showing the operation of time correction processing executed by the slave device 200. FIG. The time transmission processing program of FIG. 2 is stored in the ROM 112 of the master device 100, and the time reception processing program of FIG. 3 is stored in the ROM 212 of the slave device 200.

  As shown in FIG. 2, when the time transmission process is started in the master device 100, the CPU 111 first reads the time data from the clock 114 and converts it into a data format for transmission (step S1).

  Next, the CPU 111 makes an inquiry to the communication processing unit 120 and calculates a waiting time Tb until the next transmission timing (step S2). The communication processing unit 120 counts this time interval in order to execute transmission / reception of radio waves at a specified time interval (for example, 1.0 second), and the CPU 111 refers to this count data to perform the next transmission. The waiting time Tb until the timing can be calculated.

  Furthermore, the CPU 111 adds the waiting time Tb calculated in step S2 to the time data read in step S1 and the processing time Ta required for data creation from the reading of the time data to the calculation of the waiting time Tb. The time correction data is set in the transmission buffer 123 of the communication processing unit 120 (step S3). Here, the processing time Ta required for data creation is a fixed time spent in the processing of step S1 and step S2, and a corresponding value is set in advance. A data creation means is constituted by the processing of steps S1 to S3.

  When the time correction data is set in the transmission buffer 123, the CPU 111 of the master device 100 ends the time transmission process. Then, by the processing of the communication processing unit 120, the time correction data is transmitted to the slave device 200 at the next transmission timing.

  In the example of the sequence diagram of FIG. 4, the above time transmission process is executed in the control process J <b> 1 of the master device 100. Specifically, first, the time data “12:00 00.1” is read from the clock 114, then the waiting time Tb “0.8 seconds” is calculated, and the time data “12:00 00.1” is calculated. The transmission data including the time correction data to which the waiting time Tb “0.8 seconds” and the processing time Ta “0.1 seconds” are added is created. This transmission data is sent to the transmission buffer 123.

  Furthermore, in the communication processing unit 120 of the master device 100, radio wave transmission / reception processing J2 is performed at 1.0 second intervals, and the next transmission / reception processing in which transmission data including time correction data is sent to the transmission buffer 123 is performed. In J2, the transmission data is transmitted to the slave device 200.

  As shown in FIG. 3, when the time reception process is started in the slave device 200, first, the CPU 211 of the slave device 200 waits for the reception data to be sent, and then receives the reception data including the time correction data. If there is, it is received (step S11).

  Next, at the time (time data + processing time Ta + waiting time Tb) indicated by the time correction data included in the received data, the CPU 211 sets the processing time Tc required from the reception to the correction of the clock 214 on the slave device 200 side. The added correction time is calculated (step S12: time calculation means). This processing time Tc is a fixed time, and a corresponding value is set in advance.

  When the correction time is calculated, the CPU 211 rewrites and corrects the time data of the clock 214 with the value of the correction time (step S13: time correction means). Then, this time reception process is terminated.

  In the example of the sequence diagram of FIG. 4, the above time reception process is executed in the control process J3 of the slave device 200. Specifically, after receiving the time correction data, a correction time “12:00 01.0 + 0.2” is calculated by adding the processing time Tc to this time, and the time measurement data of the clock 214 is calculated at this correction time. It has been corrected. The correction time matches the value of the current time indicated on the clock 114 of the master device 100 at the correction timing.

  That is, by the time correction process as described above, the correction process for adjusting the time measurement data of the clock 214 of the slave device 200 to the current time value of the clock 114 of the master device 100 is performed.

  As described above, according to the time adjustment system of this embodiment, the master device 100 and the slave device 200 that perform data communication at predetermined time intervals are used for time adjustment from the master device 100 to the slave device 200 by this data communication. Data can be sent to correct the clock 214 of the slave device 200 accurately. That is, in the master device 100, the time correction data is created by adding the waiting time Tb until the next data transmission to the time data read from the clock 114, so the time of the time correction data is the data communication time. It does not depend on the time interval. Therefore, accurate time correction independent of the time interval of data communication is possible.

  Furthermore, according to the time adjustment system of this embodiment, in the master device 100, the processing time Ta required to read the time data from the clock 114 and create the time adjustment data is added to the time adjustment data. Therefore, the delay of the correction time due to the processing time Ta can be eliminated.

  Note that, specifically, the length from which processing timing to which processing timing is set as the processing time Ta may be appropriately determined depending on which processing timing is set as the start timing of the above-described waiting time Tb. . For example, if the waiting time Tb represents the time from the processing timing when the communication processing unit 120 is inquired about the time until the next data transmission to the next data transmission, the length of the processing time Ta is set as follows. Just decide. That is, the processing time Ta may be the time from the processing timing for reading time data from the clock 114 to the processing timing for inquiring the communication processing unit 120 for the time until the next data transmission.

  Further, if the waiting time Tb represents the time from the processing timing at which the waiting time Tb is calculated to the next data transmission, the processing time Ta is determined from the processing timing at which the time data is read from the clock 114. The time until the processing timing at which Tb is calculated may be used.

  Further, according to the time adjustment system of this embodiment, the slave device 200 calculates the correction time by adding the processing time Tc from the reception of the time correction data to the correction of the time data of the clock 214 after the reception. The clock data of the clock 214 is corrected at the correction time. Therefore, it is possible to correct the time accurately by eliminating the delay of the correction time due to the processing time Tc.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, in the above embodiment, the time correction data is added to the read time data by adding the waiting time Tb until the next data transmission and a predetermined processing time Ta, but the processing time Ta can be ignored. If it is small, the addition of the processing time Ta may be omitted. In the slave device 200, the time is corrected by adding the processing time Tc from the reception of the time correction data to the time correction. If the processing time Tc is small enough to be ignored, the processing time Tc The time may be corrected by omitting the addition.

  In the above embodiment, the time transmission device is a master device that is a mobile phone and the time reception device is a slave device that is a wristwatch. For example, the time transmission device receives a standard radio wave. The specific device to which the time correction system of the present invention is applied can be changed as appropriate, such as a radio timepiece that can always hold accurate time by time code, and a time receiving device that is a wristwatch that does not have a standard radio wave receiving function. . Further, transmission data including time correction data may be transmitted together from one time transmitting device to a plurality of time receiving devices, and the time of the plurality of time receiving devices may be corrected simultaneously.

  In the above embodiment, the Bluetooth communication is exemplified as the communication means of the time transmitting device and the time receiving device. However, various communication methods may be adopted as long as the method transmits and receives data at a predetermined time interval. May be. In addition, the detailed configuration and the detailed method specifically shown in the embodiments can be appropriately changed without departing from the spirit of the invention.

100 Master Device 110 Control Processing Unit 111 CPU
112 ROM
113 RAM
114 Clock 120 Communication processing unit 121 RF unit 122 Link controller 123 Transmission buffer 124 Reception buffer 200 Slave device 210 Control processing unit 211 CPU
212 ROM
213 RAM
214 Clock 220 Communication processing unit 221 RF unit 222 Link controller 223 Transmission buffer 224 Reception buffer

Claims (6)

In a time correction system including a time transmission device and a time reception device that communicate with each other at a predetermined time interval,
The time transmitter is
Current time data storage means for storing current time data;
Data creation means for creating transmission data including time correction data in which at least a waiting time until the next data transmission is added to the current time data;
Transmission data storage means for storing transmission data created by the data creation means;
Transmission means for transmitting the transmission data stored in the transmission data storage means at a transmission timing for each predetermined time interval;
With
The time receiving device is:
A time counting means for counting the current time;
Time correction means for correcting the time measurement data of the time measurement means based on the time of the time correction data when the transmission data including the time correction data is received;
A time correction system characterized by comprising: The transmission data creation means includes
The transmission data including the time correction data to which processing time required for generating the transmission data by reading the current time data from the current time data storage means is added. The time correction system according to 1. In the time receiving device,
When the transmission data including the time correction data is received, the processing time taken from the reception of the transmission data to the correction of the time data of the time measuring means at the time indicated by the time correction data is Time calculating means for calculating the correction time by adding,
The time correction means includes
The time adjustment system according to claim 1 or 2, wherein the time measuring means is corrected at the correction time calculated by the time calculating means. In a time transmitter that communicates with a time receiver at a predetermined time interval,
Current time data storage means for storing current time data;
Time correction data in which the current time data is added with a processing time taken when the current time data is read from the current time data storage means to create transmission data and a waiting time until the next data transmission is added. A data creation means for creating the transmission data;
Transmission data storage means for storing transmission data created by the data creation means;
Transmission means for transmitting the transmission data stored in the transmission data storage means at a transmission timing for each predetermined time interval;
A time transmitting apparatus comprising: In a time receiving device that communicates with a time transmitting device at a predetermined time interval,
A time counting means for counting the current time;
When the transmission data including the time correction data is received, the processing time taken from the reception of the transmission data to the correction of the time data of the time measuring means at the time indicated by the time correction data is A time calculation means for calculating a correction time by adding, and
Time correcting means for correcting the time measuring means at the correction time calculated by the time calculating means;
A time receiving device comprising: A time correction method for correcting time measurement data of the time reception device based on current time data of the time transmission device using a time transmission device and a time reception device that communicate with each other at a predetermined time interval,
The time transmitting device is
While creating the transmission data including the time correction data to which the processing time required for reading the current time data and creating the transmission data and the waiting time until the next data transmission are added to the current time data,
This transmission data is transmitted at the transmission timing for each predetermined time interval,
The time receiving device is
When the transmission data including the time correction data is received, the processing time required from the reception of the transmission data to the correction of the time measurement data is added to the time indicated by the time correction data. While calculating the correction time,
A time correction method comprising correcting the time measurement data to the correction time.

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