JP6911396B2 - Radio correction clock - Google Patents

Description

The present invention relates to a radio wave correction timepiece.

A radio wave correction clock that receives standard radio waves and corrects the internal time is known. It is necessary to acquire the time data for one frame in order to correct the internal time, but even if the time data for only one frame can be received, the received time data may be inaccurate due to an error. There is. Therefore, in general, time data for a plurality of frames is acquired in one reception process, and the time is adjusted after confirming the consistency between the frames.

However, in a noisy reception environment, it is difficult to acquire time data for one frame without errors, and it is more difficult to acquire time data for a plurality of frames without errors. Therefore, it is conceivable to increase the number of frames acquired in the reception process, but there is a problem that the reception time becomes long and the power consumption increases.

In the technique described in Patent Document 1, when the time information is already stored in the clock, the reception time can be shortened or consumed by reducing the number of frames acquired as compared with the case where the time information is not stored. We are trying to reduce power consumption.

Japanese Unexamined Patent Publication No. 2013-253925

By the way, the radio wave correction clock generally has a scheduled reception function that starts reception at a plurality of preset times (for example, 1:00, 2:00 and 3:00). When there is a lot of noise in the reception environment, for example, even if the number of frames acquired is reduced as in the technique described in Patent Document 1, the consistency between a plurality of frames in one reception process (for example, the reception process started at 1 o'clock) Cannot be confirmed, and there is a high possibility that reception will fail. If the reception environment is not improved, there is a high possibility that reception will fail each time in the subsequent reception processing (for example, reception processing started at 2 o'clock or 3 o'clock). If reception failure continues, the time required for reception becomes long and the power consumption also increases.

The present invention has been made in view of the above circumstances, and one of the problems to be solved is to provide a technique for facilitating successful reception of a standard radio wave in a radio wave correction timepiece.

In order to solve the above problems, one aspect of the radio wave correction clock according to the present invention is to have a receiving unit that receives a standard radio wave and receive the standard radio wave in the first period, and when the first period elapses, the said The receiving unit is such that the reception of the standard radio wave is stopped, the standard radio wave is received in the second period after the first period, and the reception of the standard radio wave is stopped when the second period elapses. The first reception time data is acquired based on the reception timing control unit that controls the data and the standard radio wave received by the reception unit in the first period, and is received by the reception unit in the second period. A time data acquisition unit that acquires second reception time data based on the standard radio wave, a first internal unit that indicates the internal time at the time of acquisition of the first reception time data and the first reception time data. The relationship with the time data is the first relationship, and the relationship between the second reception time data and the second internal time data indicating the internal time at the time of acquisition of the second reception time data is the second relationship. Then, at least the storage unit that stores the data showing the first relationship and the data showing the second relationship, and at least the data showing the first relationship and the second relationship are stored. Based on the indicated data, the first determination unit that determines whether to correct the internal time based on the second reception time data, and the internal time that corrects the internal time based on the determination result of the first determination unit. It is equipped with a correction unit.

According to the above aspect, as the reception time data referred to for determining whether or not to correct the internal time by the second reception time data, the first period prior to the second period in which the second reception time data is acquired is the first. The first reception time data acquired during the period of is used. As such referenced reception time data, even if appropriate reception time data cannot be acquired in the second period, the first reception time data acquired in the first period can be used to obtain the first reception time data. Whether or not to correct the internal time can be determined from the reception time data of 2. This facilitates successful reception of standard radio waves.

In one aspect of the radio wave correction clock described above, it is determined whether or not the first reception time data satisfies the predetermined first criterion, and whether the second reception time data satisfies the first criterion. The storage unit includes a second determination unit that determines whether or not the data is to be determined, and the storage unit includes the first reception time data that is determined by the second determination unit to satisfy the first criterion. The data showing the relationship is stored, and the data showing the second relationship is stored for the second reception time data determined by the second determination unit to satisfy the first criterion. According to this aspect, the reliability of the correction of the internal time can be improved by improving the quality of the first reception time data and the second reception time data by the second determination unit.

In one aspect of the radio wave correction clock described above, the data showing the first relationship includes the first reception time data and the first internal time data, and the data showing the second relationship is said. The first determination unit includes the second reception time data and the second internal time data, and the first determination unit is a reception time difference data which is a difference between the second reception time data and the first reception time data. Is calculated, the internal time difference data which is the difference between the second internal time data and the first internal time data is calculated, the received time difference data and the internal time difference data are compared, and the comparison result is obtained. It is determined whether or not to correct the internal time based on the second reception time data according to the above. According to this aspect, it is possible to determine whether or not the second reception time data is consistent with the first reception time data by comparing the reception time difference data with the internal time difference data.

In one aspect of the radio wave correction clock described above, the data showing the first relationship includes the first reception time data and the first internal time data, and the data showing the second relationship is said. The first reception unit includes the second reception time data and the second internal time data, and the first determination unit is a first reception which is a difference between the first reception time data and the first internal time data. The internal time difference data is calculated, the second reception internal time difference data which is the difference between the second reception time data and the second internal time data is calculated, and the first reception internal time difference data is calculated. It is compared with the second reception internal time difference data, and it is determined whether or not to correct the internal time with the second reception time data according to the comparison result. According to this aspect, by comparing the first reception internal time difference data and the second reception internal time difference data, it is determined whether or not the second reception time data is consistent with the first reception time data. can do.

In one aspect of the radio wave correction clock described above, the data showing the first relationship includes the first reception internal time difference data which is the difference between the first reception time data and the first internal time data. The data showing the second relationship includes the second reception internal time difference data which is the difference between the second reception time data and the second internal time data, and the first determination unit includes the second reception internal time difference data. The first reception internal time difference data and the second reception internal time difference data are compared, and it is determined whether or not to correct the internal time by the second reception time data according to the comparison result. According to this aspect, by comparing the first reception internal time difference data and the second reception internal time difference data, it is determined whether or not the second reception time data is consistent with the first reception time data. can do. By configuring the storage unit to store the first reception internal time difference data and the second reception internal time difference data, the storage unit stores the first reception time data, the first internal time data, and the second reception. The amount of data stored in the storage unit can be reduced as compared with the configuration in which the time data and the second internal time data are stored. By configuring the first determination unit to process the first reception internal time difference data and the second reception internal time difference data, the first determination unit performs the first reception time data and the first reception time difference data. The amount of processing performed by the first determination unit can be reduced as compared with the configuration in which processing is performed on the internal time data, the second reception time data, and the second internal time data.

In one aspect of the radio wave correction clock described above, when the difference between the second internal time data and the first internal time data is small and satisfies a predetermined second criterion, the first relationship is described. Is used for determining whether or not to correct the internal time based on the second reception time data, and when the difference does not satisfy the second criterion and is large, the first relationship is the second. It is not used to determine whether to correct the internal time based on the received time data. According to this aspect, since the difference between the second internal time data and the first internal time data is small, the deviation due to the step between the second internal time data and the first internal time data is suppressed. It is possible to improve the reliability of the correction of the internal time.

In one aspect of the radio wave correction clock described above, an internal time change process for changing the internal time between the internal time corresponding to the first internal time data and the internal time corresponding to the second internal time data. If the above is not performed, the first relationship is used to determine whether or not to correct the internal time based on the second reception time data, and if the internal time change processing is performed, the first Is not used in determining whether or not to correct the internal time based on the second reception time data. According to this aspect, the internal time change process is not performed between the internal time corresponding to the first internal time data and the internal time corresponding to the second internal time data, so that the second internal Since the continuity between the time data and the first internal time data is maintained, the reliability of the correction of the internal time can be improved.

It is a block diagram which shows the structure of the radio wave correction timepiece which concerns on one Embodiment of this invention. It is a functional block diagram which shows the structure of a control part. It is a flowchart which shows the scheduled reception processing. It is a flowchart which shows the reception control processing. It is a flowchart which shows the data storage process. This is an example of the data structure of a table. It is a flowchart which shows the consistency determination processing. It is a table exemplifying the reception time data and the corresponding internal time data stored in the table, and the consistency determination result. It is a flowchart of the consistency determination processing by 2nd Embodiment. It is a flowchart which shows the data storage process in 3rd Embodiment. This is an example of the data structure of the table in the third embodiment. It is a flowchart which shows the consistency determination processing in 3rd Embodiment. It is a flowchart which shows the scheduled reception processing by 4th Embodiment. It is a flowchart which shows the scheduled reception processing by 5th Embodiment.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings and the like. However, in each figure, the dimensions and scale of each part are appropriately different from the actual ones. Further, since the embodiments described below are suitable specific examples of the present invention, various technically preferable limitations are attached, but the scope of the present invention particularly limits the present invention in the following description. Unless otherwise stated, the present invention is not limited to these forms.

<First Embodiment>
[Outline configuration of radio wave correction clock]
FIG. 1 is a block diagram showing a configuration of a radio wave correction clock 1 according to an embodiment of the present invention. The radio wave correction clock 1 receives a long-wave standard radio wave (hereinafter abbreviated as "standard radio wave"), acquires time data included in the standard radio wave, and measures the internal time based on the acquired time data. Fix it.

The radio wave correction clock 1 includes an antenna 2, a receiving circuit 3, a processing unit 4, an oscillator 5, a display unit 6, and an operation unit 7. The antenna 2 receives a standard radio wave and outputs a reception signal corresponding to the received standard radio wave to the receiving circuit 3. The receiving circuit 3 causes the antenna 2 to receive radio waves of a specific frequency, demodulates the TCO (Time Code Out) signal based on the received signal input from the antenna 2, and processes the TCO signal. Output to 4. The receiving unit 8 is configured by the antenna 2 and the receiving circuit 3.

The processing unit 4 performs various processes for controlling the operation of the radio wave correction clock 1. The processing unit 4 outputs a control signal to the receiving circuit 3 to control the operation of the receiving circuit 3. The processing unit 4 also decodes the TCO signal input from the receiving circuit 3 to generate a TC (Time Code), and acquires the time data included in the TC. The processing unit 4 also determines whether or not the acquired time data is highly reliable time data that can be adopted for correcting the internal time (whether or not there is consistency), as will be described in detail later, and is consistent. Correct the internal time based on the time data determined to be. The processing unit 4 also causes the display unit 6 to display the internal time.

The oscillator 5 has a crystal oscillator and outputs a reference signal having a predetermined reference clock frequency (for example, 32.768 kHz) oscillated by the crystal oscillator. The reference signal output from the oscillator 5 is input to the processing unit 4, and is divided into 1 Hz signals by the processing unit 4.

The display unit 6 displays the internal time measured by the processing unit 4. As the configuration of the display unit 6, for example, a liquid crystal panel can be adopted, and for example, a configuration including a dial and a pointer, a step motor for rotating the pointer, and a gear can be adopted.

The operation unit 7 outputs an operation signal corresponding to the operation by the user to the processing unit 4, and is composed of a crown, a button, and the like exposed to the outside of the radio wave correction watch 1. The operation unit 7 is used for an operation in which the user changes the internal time. The operation unit 7 is also used for an operation of selecting the type of standard radio wave received by the antenna 2 (standard radio wave JJY in Japan, standard radio wave WWVB in the United States, etc.).

[Receiver circuit configuration]
The receiving circuit 3 includes a tuning circuit 31, a first amplifier circuit 32, a local oscillation signal generation unit 33, a frequency conversion unit 34, a BPF (Band-pass filter) 35, a second amplifier circuit 36, a detection circuit 37, and a binarization circuit. 38 and a decoding circuit 39 are provided. The decoding circuit 39 decodes the control signal input from the processing unit 4 and outputs the control content indicated by the control signal to the functional units 31 to 38.

The tuning circuit 31 is configured to include a capacitor, and the tuning circuit 31 and the antenna 2 form a parallel resonant circuit. The tuning circuit 31 causes the antenna 2 to receive a radio wave having a specific frequency to be received according to a control signal input from the processing unit 4.

The first amplifier circuit 32 amplifies the received signal input from the tuning circuit 31 to a constant amplitude. The local oscillation signal generation unit 33 generates a local oscillation signal output to the frequency conversion unit 34. The frequency conversion unit 34 mixes the received signal input from the first amplifier circuit 32 and the local oscillation signal input from the local oscillation signal generation unit 33, and outputs a processing signal to the BPF 35.

The BPF 35 passes only the signal component of the predetermined frequency band among the processing signals input from the frequency conversion unit 34, and blocks the signal of the frequency component outside the band. The BPF 35 is configured to include a crystal filter, and the center frequency of the crystal filter is set to, for example, 30 kHz. Noise can be effectively removed by matching the frequency of the processing signal output from the frequency conversion unit 34 with the center frequency of the crystal filter.

The second amplifier circuit 36 further amplifies the received signal input from the BPF 35 with a fixed gain. The detection circuit 37 includes a rectifier and an LPF (Low-Pass Filter), rectifies and filters the received signal input from the second amplifier circuit 36, and outputs the obtained envelope signal to the binarization circuit 38. ..

The binarization circuit 38 is composed of a binarization comparator. The binarization circuit 38 compares the signal level of the envelope signal input from the detection circuit 37 with the voltage level of the reference voltage, and generates a TCO signal which is a binarization signal. Then, the binarization circuit 38 outputs the TCO signal to the processing unit 4.

[Configuration of processing unit]
The processing unit 4 includes a time data acquisition unit (TCO decoding unit) 41, a storage unit 42, a timekeeping unit 43, an internal time correction unit 44, a drive unit 45, and a control unit 46.

The time data acquisition unit 41 decodes the TCO signal input from the receiving circuit 3 and extracts the TC from the TCO signal. The TC includes time data and the like. Then, the time data acquisition unit 41 outputs the extracted TC to the control unit 46 and stores it in the storage unit 42. The time data acquisition unit 41 can decode TCs of a plurality of types of standard radio waves such as JJY and WWVB.

The storage unit 42 stores various data and programs necessary for controlling the radio wave correction clock 1 by the processing unit 4. The storage unit 42 stores the TC acquired by the time data acquisition unit 41, and also stores the internal time of the radio wave correction clock 1. The storage unit 42 includes a table TBL that stores data used in the reception process described later.

The timekeeping unit 43 updates the internal time stored in the storage unit 42 based on the 1 Hz signal generated from the reference signal input from the oscillator 5, thereby measuring the current date and time.

The internal time correction unit 44 corrects the internal time stored in the storage unit 42 based on the time data included in the TC acquired by the time data acquisition unit 41. As the time data used for correcting the internal time, the time data determined to be consistent by the consistency determination process in the reception process described later is used.

The drive unit 45 controls the drive of the display unit 6 to cause the display unit 6 to display the internal time. When the display unit 6 is composed of a liquid crystal panel, the drive unit 45 causes the liquid crystal panel to display the internal time. When the display unit 6 has a dial and a pointer, and a stepping motor and a gear for rotating the pointer, the drive unit 45 outputs a pulse signal to the stepping motor and uses the pointer to set the internal time. Is displayed. The date may be displayed in addition to the current time.

[Control unit configuration]
The control unit 46 is configured by using a CPU (Central Processing Unit), and the CPU functions as a control unit 46 that controls the radio wave correction clock 1 by executing a control program stored in the storage unit 42. .. The control unit 46 is driven based on a reference signal input from the oscillator 5 and executes various control processes. For example, the control unit 46 outputs the reference signal input from the oscillator 5 to the receiving circuit 3 and outputs the control signal to the decoding circuit 39 described above. The control signal input from the control unit 46 to the decoding circuit 39 is transmitted via the serial communication line.

FIG. 2 is a functional block diagram showing the configuration of the control unit 46. The control unit 46 includes a reception timing control unit 461, a consistency determination unit 462, a reception time data quality determination unit 463, and an internal time data quality determination unit 464. The reception process described later is performed using each of these parts. The control unit 46 may include other functional blocks as needed.

The time data acquisition unit 41 may be configured by hardware different from the CPU constituting the control unit 46, but may be realized as a function of the CPU constituting the control unit 46, and the control unit 46 may be realized. , The time data acquisition unit 41 may be included as a functional block.

[Reception processing]
Hereinafter, the reception process of the standard radio wave by the radio wave correction clock 1 will be described with reference to FIGS. 3 to 8. First, the general flow of reception processing will be described. The reception process is automatically started, for example, from a fixed time every day. The fixed time is set, for example, 1 o'clock, 2 o'clock and 3 o'clock. One reception process (for example, one reception process starting at 1 o'clock) is carried out for a predetermined period (for example, 12 minutes). If the reception process is not successful during the period of one reception process, the reception process is temporarily stopped, and then the next reception process (for example, the reception process started at 2 o'clock) is started. If the reception is successful, the reception process is terminated. Here, the reception process for one time is called a scheduled reception process.

FIG. 3 is a flowchart showing a scheduled reception process. In step S1, when the internal time reaches the reception start time (for example, 1 o'clock) at which the scheduled reception process should be started, the reception timing control unit 461 controls the reception unit 8 to start receiving the standard radio wave. The reception timing control unit 461 waits for the reception start time until the reception start time is reached.

After the reception of the standard radio wave is started, the reception control process is performed in step 2. FIG. 4 is a flowchart showing the reception control process. In step S10 of the reception control process, the time data acquisition unit 41 performs a second synchronization process with respect to the standard radio wave.

If the second synchronization is not successful, in step S19b, the control unit 46 sets the "reception failure" flag. When step S19b is performed, the reception control process ends. If the second synchronization is successful, in step S11, the time data acquisition unit 41 acquires a standard radio wave marker.

After the marker is acquired, in step S12, the reception timing control unit 461 determines whether or not a predetermined period (first period) has elapsed from the reception start time.

When the predetermined period has elapsed, in step S19b, the control unit 46 sets the "reception failure" flag. When step S19b is performed, the reception control process ends. When the predetermined period has elapsed, the reception timing control unit 461 controls the reception unit 8 to stop the reception of the standard radio wave.

If the predetermined period has not elapsed, in step S13, the time data acquisition unit 41 acquires time data (first reception time data) from the standard radio wave. The time data acquired from the standard radio wave is called the reception time data as opposed to the internal time data indicating the internal time.

After the reception time data is acquired, in step S14, the reception time data quality determination unit 463 determines whether or not the reception time data acquired in step S13 is error-free data. Criteria for error-free include, for example, the matching of TC parity corresponding to the acquired reception time data, and for example, "minute", "hour", and "year / month / day" can be taken. It includes being a value ("minute" is a value from 00 to 59 minutes, "hour" is a value from 00:00 to 23:00, and "year / month / day" is a date that exists). ..

If there is an error in the reception time data, the process returns to step S12, and it is determined again whether or not the predetermined period has elapsed from the reception start time. If the predetermined period has not elapsed, new reception time data is acquired in step S13. NS. If there is no error in the reception time data, the data storage process is performed in step S15.

FIG. 5 is a flowchart showing the data storage process. In step S20 of the data storage process, the reception time data quality determination unit 463 stores the reception time data acquired in step S13 in the table TBL. Further, in step S21, the reception time data quality determination unit 463 displays the internal time data (internal time data corresponding to the reception time data) indicating the internal time at the time of acquisition of the reception time data acquired in step S13 in the table TBL. To memorize.

FIG. 6 is an example of the data structure of the table TBL. In the first embodiment, the reception time data T1a and the internal time data T1b corresponding to the reception time data are stored in the table TBL as a pair. Similarly, the reception time data T2a to T7a are stored in pairs with the corresponding internal time data T2b to T7b, respectively. In this example, the reception time data T1a and the like and the internal time data T1b and the like indicate "year, month, day, hour, minute, minute", respectively. In the table TBL of this example, a maximum of 7 pairs of reception time data and corresponding internal time data are stored.

The table TBL in the first embodiment stores the pair of the reception time data and the corresponding internal time data, so that the relationship between the reception time data and the internal time data (the reception time data and the internal time). Shows one aspect of the storage unit 42 that stores the relationship of the difference with the data).

The number of reception time data stored in the table TBL (the number of pairs stored in the table TBL) is referred to as the data storage number n. Initially, the reception time data and the internal time data are not stored in the table TBL, and the initial data storage number n is 0. Corresponding to the storage of the reception time data and the corresponding internal time data in steps S20 and S21 in the data storage process shown in FIG. 5, in step S22, the reception time data quality determination unit 463 stores the data. Add one number n. When step S22 is performed, the data storage process ends.

When the data storage process is completed, the process proceeds to step S16 in the reception control process shown in FIG. In step S16, the consistency determination unit 462 determines whether or not the data storage number n is equal to or greater than the matching number threshold value N. The matching number threshold N will be described later. If the number of data stored n is not equal to or greater than the matching number threshold value N, the process returns to step S12, and it is determined again whether or not a predetermined period has elapsed from the reception start time. Data is retrieved.

As can be understood from the above description, in the reception control process, after the marker is acquired, the acquisition of the reception time data is repeated until a predetermined period elapses from the reception start time, and the data is stored in the table TBL. The number of received time data (number of stored data) n increases.

When the acquisition of the reception time data is repeated and the data storage number n becomes the matching number threshold value N or more, the process proceeds to step S17, and the consistency determination process is performed. As will be described later, in order for the matching number j to be equal to the matching number threshold N (reaching the matching number threshold N), it is necessary that the data storage number n is equal to or higher than the matching number threshold N. Therefore, in step S16, the data It is determined whether or not the storage number n is equal to or greater than the matching number threshold value N.

FIG. 7 is a flowchart showing the consistency determination process. In step S30 of the consistency determination process, the consistency determination unit 462 sets the initial value of the number i to 1. The fact that the number of reception time data (data storage number) stored in the table TBL is n means that the nth reception time data stored in the table TBL is the most recently acquired reception time data. show. The number i is used to represent the (ni) th reception time data retroactively from the nth reception time data.

Further, in step S30, the consistency determination unit 462 sets the initial value of the matching number j to 1. The matching number j indicates the number of reception time data that is consistent with the nth reception time data. Since the nth reception time data is considered to be consistent with the nth reception time data itself, the minimum value of the matching number j is 1.

In step S31, the consistency determination unit 462 calculates the reception time difference data D1 which is the difference between the nth reception time data and the (ni) th reception time data.

In step S32, the consistency determination unit 462 calculates the internal time difference data D2, which is the difference between the nth internal time data and the (ni) th internal time data.

In step S33, the consistency determination unit 462 compares the reception time difference data D1 with the internal time difference data D2. In this example, in the comparison, it is determined whether or not the reception time difference data D1 and the internal time difference data D2 match.

The situation where the reception time difference data D1 and the internal time difference data D2 match is, for example, when the reception time difference data D1 indicates a plus 1 minute, the internal time difference data D2 also indicates a plus 1 minute. The situation.

When the reception time difference data D1 and the internal time difference data D2 match, it is determined that the nth reception time data and the (ni) th reception time data are consistent, and in step S34, it is determined. The consistency determination unit 462 adds one matching number j. When step S34 is performed, the process proceeds to step S35.

If the reception time difference data D1 and the internal time difference data D2 do not match, it is determined that the nth reception time data and the (ni) th reception time data do not match, and step S34 is skipped. , The matching number j is not added, and the process proceeds to step S35.

In step S35, the consistency determination unit 462 adds one number i. Next, in step S36a, the consistency determination unit 462 determines whether the matching number j is equal to the matching number threshold N. The matching number threshold value N is a threshold value for determining whether or not the matching number j has reached a sufficient size, and is a predetermined integer of 2 or more. The matching number threshold value N can be adjusted as necessary, and the larger the matching number threshold value N, the stricter the criteria for determining the consistency. The matching number threshold N is, for example, 3, and the matching number j is 3, which means that the nth reception time data is consistent with itself and is earlier than the nth reception time data. It shows that it is consistent with the acquired two ((N-1)) reception time data.

When the matching number j is equal to the matching number threshold value N, the consistency determination unit 462 sets the “consistent” flag in step S37a. When step S37a is performed, the consistency determination process ends.

When the matching number j is not equal to the matching number threshold N (when the matching number j has not reached the matching number threshold N and is less than the matching number threshold N), in step S36b, the consistency determination unit 462 has a number number. It is determined whether i is smaller than the data storage number n. When the number i is smaller than the data storage number n, the process returns to step S31, and the consistency determination in steps S31 to S33 is performed again. When the number i is not smaller than the data storage number n (when the number i is added until the data storage number n is reached), in step S37b, the consistency determination unit 462 sets a flag of "inconsistency". Set. When step S37b is performed, the consistency determination process ends.

In this way, in the consistency determination process, the consistency of the most recently acquired reception time data (the nth reception time data stored in the table TBL) is the reception acquired earlier than this reception time data. The determination is made by referring to the time data ((ni) th reception time data).

When the consistency determination process (process until the "consistent" or "inconsistent" flag is set) is completed, the process proceeds to step S18 in the reception control process shown in FIG. In step S18, the consistency determination unit 462 determines whether or not the reception time data is consistent based on the “consistent” or “inconsistent” flag set in the consistency determination process.

If it is determined that there is no consistency, the process returns to step S12, and it is determined again whether or not a predetermined period has elapsed from the reception start time. If the predetermined period has not elapsed, new reception time data is acquired in step S13. Then, the processing of step S14 and the like is performed again.

If it is determined that there is consistency, in step S19a, the control unit 46 sets a flag of "reception success". When step S19a is performed, the reception control process ends.

When the reception control process is completed, the process proceeds to step S3 in FIG. In step S3, the control unit 46 determines whether or not the reception is successful based on the “reception success” or “reception failure” flag set in the reception control process.

When it is determined that the reception is successful, in step S4, the internal time correction unit 44 determines the internal time based on the most recently acquired reception time data determined to be consistent in step S18 of the reception control process. To fix. The reception time data determined to be consistent has sufficient consistency (the matching number j has reached the matching number threshold N) and is highly reliable reception time data, and is therefore used for correcting the internal time. It can be adopted as the reception time data to be received. The consistency determination unit 462 can also be said to be a determination unit that determines whether or not to correct the internal time based on the reception time data that is the target of the consistency determination.

When the internal time is corrected, in step S5, the internal time correction unit 44 deletes all the data stored in the table TBL. Due to this deletion, the number of received time data and internal time data stored in the table TBL becomes 0. In step S6, the internal time correction unit 44 initializes the data storage number n to 0. When step S6 is performed, the scheduled reception process ends.

If it is determined that the reception has failed, the processes of steps S4 to S6 are skipped, and the scheduled reception process ends. As described above, the scheduled reception process is performed.

If it is determined in step S3 that the reception has failed, step S4 is skipped, and the internal time is not corrected in the scheduled reception process of this time. Further, by skipping step S5, the data stored in the table TBL is retained, and by skipping step S6, the number of stored data n is retained without being initialized.

Next, the scheduled reception process performed after the scheduled reception process that is determined to have failed and ended will be described. This scheduled reception process that is performed later is called the second scheduled reception process, and the scheduled reception process that is performed prior to that and is completed due to a reception failure is called the first scheduled reception process.

In step S1 of the second scheduled reception process, the reception timing control unit 461 controls the reception unit 8 to control the standard radio wave when the internal time reaches the reception start time (for example, 2:00) at which the scheduled reception process should be started. Start receiving.

In the same manner as the first scheduled reception process, the reception control process is performed in step S2. After the second synchronization in step S10 of the reception control process and the marker acquisition in step S11, in step S12, the reception timing control unit 461 determines whether or not a predetermined period (second period) has elapsed from the reception start time. If the predetermined period has not elapsed, in step S13, the time data acquisition unit 41 acquires time data (second reception time data) from the standard radio wave. When the predetermined period has elapsed, the reception timing control unit 461 controls the reception unit 8 to stop the reception of the standard radio wave.

If it is determined in step S14 that there is no error in the reception time data acquired in step S13, data storage processing is performed in step S15, and the reception time data is stored in the table TBL. In the first scheduled reception process, the data stored in the table TBL is retained by skipping step S5, and the data storage number n is retained without being initialized by skipping step S6. There is. Therefore, in step S15, the reception time data acquired in the second scheduled reception process and the corresponding internal time data are additionally stored in the table TBL, and the stored number n is additionally stored. ..

If it is determined in step S16 that the number of data stored n is equal to or greater than the matching number threshold value N, the consistency determination process is performed in step S17. Since the reception time data acquired in the first scheduled reception process is held in the table TBL as the reception time data acquired in the past, the consistency of the reception time data is acquired in the second scheduled reception process. The determination is made by referring not only to the received reception time data but also to the reception time data acquired in the first scheduled reception process. The method of determining the consistency is the same as that in the first scheduled reception process.

In the present embodiment, the consistency of the reception time data acquired in the second (certain time) scheduled reception process is acquired in the first scheduled reception process (the time performed prior to the certain time). It is characterized in that it is determined by referring to the received reception time data. A specific example will be described later with reference to FIG. In such a determination, at least a pair of the reception time data acquired in the second scheduled reception process and the corresponding internal time data, and the reception time data acquired in the first scheduled reception process and corresponding to the pair. The consistency of the reception time data acquired in the second scheduled reception process is determined based on the pair of internal time data to be performed.

The pair of the reception time data acquired in the second scheduled reception process and the corresponding internal time data is the relationship between the reception time data acquired in the second scheduled reception process and the corresponding internal time data ( This relationship is called the second relationship). Further, the pair of the reception time data acquired in the first scheduled reception process and the corresponding internal time data is the reception time data acquired in the first scheduled reception process and the corresponding internal time data. It is the data which shows the relation (this relation is called the first relation). Therefore, the consistency determination unit 462 determines the consistency based on at least the data showing the first relationship and the data showing the second relationship.

In the third embodiment described later, the reception internal time difference data, which is the difference between the reception time data acquired in the second scheduled reception process and the corresponding internal time data, is the second scheduled reception process. It is data showing the relationship (second relationship) between the reception time data acquired in and the corresponding internal time data. In addition, the reception internal time difference data, which is the difference between the reception time data acquired in the first scheduled reception process and the corresponding internal time data, is the reception time data acquired in the first scheduled reception process and this. The data shows the relationship (first relationship) with the internal time data corresponding to.

The processing after step S18 is performed in the same manner as the first scheduled reception processing, and the reception control processing ends. After the reception control process in step S2 is completed, the processes after step S3 are performed in the same manner as the first scheduled reception process, and the second scheduled reception process is completed.

Hereinafter, the determination of consistency will be described more specifically by taking as an example the case where the first scheduled reception process is started at 1 o'clock and the second scheduled reception process is started at 2 o'clock.

FIG. 8 is a table illustrating the reception time data and the corresponding internal time data stored in the table TBL, and the consistency determination result. The reception time data shown in FIG. 8 is reception time data determined that there is no error in step S14 of the reception control process. The matching number threshold N is set to 3.

In the example shown in FIG. 8, the first reception is performed at the internal time "1: 2" during the scheduled reception process (automatic reception at 1 o'clock) started at 1 o'clock internal time on November 11, 2016. The time data "November 11, 2016 1:05" is acquired, and the second reception time data "November 11, 2016 1:06" is acquired at the internal time "1: 3". , The third reception time data "November 11, 2016 1: 1" is acquired at the internal time "1:06". In order to avoid complication of the explanation, the notation of "November 11, 2016", which is the "year / month / day" part of the received time data or the internal time data, may be omitted.

When the third reception time data "1: 1 on November 11, 2016" is acquired, the data storage number n reaches the matching number threshold value N of 3, and the consistency in the reception control process step S17. Judgment processing is performed. First, the consistency between the third reception time data and the second reception time data is determined.

The reception time difference data D1 between the third reception time data and the second reception time data calculated in step S31 indicates minus 5 minutes. On the other hand, the internal time difference data D2 between the third internal time data and the second internal time data calculated in step S32 indicates plus 3 minutes. Therefore, in the comparison in step S33, the reception time difference data D1 and the internal time difference data D2 do not match, and the third reception time data and the second reception time data do not match. The matching number j remains 1.

Next, the consistency between the third reception time data and the first reception time data is determined. In this determination, the reception time difference data D1 is minus 4 minutes, the internal time difference data D2 is plus 4 minutes, and the reception time difference data D1 and the internal time difference data D2 do not match, and the third reception is received. The time data and the first received time data are inconsistent. The matching number j remains 1.

During the scheduled reception processing period started at 1 o'clock, there are no errors and the number of reception time data stored in the table TBL is three. The scheduled reception process started at 1 o'clock ends with a determination of reception failure because the matching number j is finally 1 and does not reach the matching number threshold N of 3.

After that, in the period of the scheduled reception processing (automatic reception at 2 o'clock) started at 2 o'clock internal time on November 11, 2016, the 4th reception time data "2016" was set to the internal time "2:02". "November 11, 2:04" will be acquired. As a result, the number of data stored n becomes 4.

Since 4 of the data storage number n is 3 or more of the matching number threshold value N, the consistency determination process of step S17 is performed. First, the consistency between the fourth reception time data and the third reception time data is determined. In this determination, the reception time difference data D1 is plus 1 hour and 3 minutes, the internal time difference data D2 is plus 56 minutes, and the reception time difference data D1 and the internal time difference data D2 do not match, and the fourth piece. The reception time data of is inconsistent with the third reception time data. The matching number j remains 1.

Next, the consistency between the fourth reception time data and the second reception time data is determined. In this determination, the reception time difference data D1 is plus 58 minutes and the internal time difference data D2 is plus 59 minutes, and the reception time difference data D1 and the internal time difference data D2 do not match, and the fourth reception is received. The time data and the second received time data are inconsistent. The matching number j remains 1.

Next, the consistency between the fourth reception time data and the first reception time data is determined. In this determination, the reception time difference data D1 is plus 59 minutes, the internal time difference data D2 is plus 1 hour and 0 minutes, and the reception time difference data D1 and the internal time difference data D2 do not match, and the fourth piece. The reception time data of is inconsistent with the first reception time data. The matching number j remains 1.

During the scheduled reception processing period started at 2 o'clock, the fifth reception time data "November 11, 2016 2: 9" is further acquired at the internal time "2:06". As a result, the number of data stored n becomes 5, and the consistency determination process is performed again. First, the consistency between the fifth reception time data and the fourth reception time data is determined. In this determination, the reception time difference data D1 is plus 5 minutes, the internal time difference data D2 is plus 4 minutes, and the reception time difference data D1 and the internal time difference data D2 do not match, and the fifth reception is received. The time data and the fourth received time data are inconsistent. The matching number j remains 1.

Next, the consistency between the fifth reception time data and the third reception time data is determined. In this determination, the reception time difference data D1 is plus 1 hour and 8 minutes, the internal time difference data D2 is plus 1 hour and 0 minutes, and the reception time difference data D1 and the internal time difference data D2 do not match, and 5 The third reception time data and the third reception time data are inconsistent. The matching number j remains 1.

Next, the consistency between the fifth reception time data and the second reception time data is determined. In this determination, the reception time difference data D1 is plus 1 hour and 3 minutes, and the internal time difference data D2 is plus 1 hour and 3 minutes. The reception time data of the first eye and the reception time data of the second eye are consistent. The matching number j is added by 1 from 1 to obtain 2.

Next, the consistency between the fifth reception time data and the first reception time data is determined. In this determination, the reception time difference data D1 is plus 1 hour and 4 minutes, and the internal time difference data D2 is plus 1 hour and 4 minutes. The reception time data of the first eye and the reception time data of the first eye are consistent. The matching number j is added by 1 from 2 to become 3.

In this way, the fifth reception time data is consistent with itself and is consistent with the second and first reception time data, and the fifth reception time data and the first reception time data. When the consistency with is determined, the matching number j becomes 3, and the matching number threshold N reaches 3. Therefore, the fifth reception time data is determined to be consistent reception time data, and the acquisition of the fifth reception time data is determined to be successful reception.

In this example, the data showing the second relationship described above is the fifth reception time data "2: 9" acquired during the scheduled reception processing period started at 2 o'clock and the corresponding 5 data. It is a pair with the internal time data of the eye "2:06". Further, the data showing the first relationship described above includes, for example, the second reception time data "1: 6" acquired during the scheduled reception processing period started at 1 o'clock and the two corresponding data. It is a pair with the internal time data "1: 3" of the eye, and for example, the first reception time data "1:05" acquired during the scheduled reception processing period started at 1 o'clock and this. It is a pair with the first internal time data "1: 2" corresponding to.

When it is determined that the reception is successful, in step S4, the internal time "November 11, 2016 2:06" corresponding to the fifth reception time data is the fifth reception time data "2016". It will be revised to "2:09 on November 11th". Then, in step S5, all the data in the table TBL is deleted, and in step S6, the data storage number n is initialized to 0, and the scheduled reception process started at 2 o'clock ends.

As described above, in the present embodiment, the consistency of the reception time data acquired in the scheduled reception process of a certain time (for example, started at 2 o'clock) is set prior to the certain time (in the past than the certain time). The determination can be made by referring to the reception time data acquired in the scheduled reception process (for example, started at 1 o'clock) of the times performed (such a determination is referred to as a determination according to the embodiment).

When the consistency of the reception time data acquired in the scheduled reception process of a certain time is judged by referring only to the reception time data acquired in the scheduled reception process of the certain time by performing the determination according to the embodiment ( Such a determination is called a determination based on a comparative form), and the following advantages can be obtained.

In the judgment by the comparison form, a sufficient number of reception time data (in this example, three or more error-free reception time data) are acquired and the acquired reception time data is obtained only in a certain scheduled reception process. It is necessary to have consistency that satisfies the matching number threshold value N (3 in this example) or more. However, for example, in a noisy reception environment, it is difficult to obtain a sufficient number of reception time data so that consistency can be satisfied only by a certain scheduled reception process.

In the example shown in FIG. 8, the number of reception time data acquired in the scheduled reception process started at 1 o'clock is 3, and only the third reception time data is subject to the consistency determination. .. However, the third reception time data is inconsistent with either the second or first reception time data, and the scheduled reception process started at 1 o'clock results in a reception failure.

Further, in the determination based on the comparative form, there is a high possibility that the reception will fail even in the scheduled reception processing of the times performed after the times when the reception fails, unless the reception environment is improved. In the example shown in FIG. 8, the second reception time data and the first reception time data are not consistent with respect to the two reception time data acquired in the scheduled reception process started at 2 o'clock.

On the other hand, in the determination according to the embodiment, a sufficient number of reception time data are acquired and acquired in the total period of the scheduled reception process of a certain time and the scheduled reception process of the times performed prior to the certain time. It suffices to have consistency so that the received reception time data satisfies the matching number threshold value N or more. The number of times performed prior to the certain time is not limited to the time performed immediately before the certain time, and may be a time performed further before the certain time. It may also be performed on different days.

In the example shown in FIG. 8, the first and second reception time data acquired in the scheduled reception process started at 2 o'clock are the fourth in the total period of the scheduled reception process started at 1 o'clock. This is the fifth reception time data. Therefore, the fourth and fifth reception time data in total acquired by the scheduled reception process started at 2 o'clock can be the target of the consistency determination. In this example, the 4th reception time data is inconsistent with any of the 3rd to 1st reception time data, but the 5th reception time data is the 4th to 1st. It is consistent with the second and first reception time data of the above reception time data. As a result, the reception is successful in the scheduled reception process started at 2 o'clock. In this way, by setting the total period of the scheduled reception process of a certain time and the scheduled reception process of the time performed prior to the certain time as the target period of the consistency judgment, for example, reception with a lot of noise Even in the environment, it becomes easy to succeed in reception.

As described above, the radio wave correction clock 1 according to the present embodiment receives the standard radio wave between the receiving unit 8 that receives the standard radio wave and the standard radio wave during a certain period of the scheduled reception process (this period is called the first period). When the first period elapses, the reception of the standard radio wave is stopped, and the standard radio wave is received during the period of the scheduled reception processing (this period is called the second period) performed after the first period. The data is received based on the reception timing control unit 461 that controls the reception unit 8 and the standard radio wave received by the reception unit 8 in the first period so that the reception of the standard radio wave is stopped when the second period elapses. The time data (this reception time data is referred to as the first reception time data) is acquired, and the reception time data (this reception time data is referred to as the first reception time data) based on the standard radio wave received by the reception unit 8 in the second period. The time data acquisition unit 41 that acquires the reception time data of 2), the first reception time data, and the internal time data (first internal time data) indicating the internal time at the time of acquiring the first reception time data. ) Is the first relationship, and the relationship between the second reception time data and the internal time data (second internal time data) indicating the internal time at the time of acquisition of the second reception time data is the second. The storage unit 42 (table TBL) that stores at least the data showing the first relationship and the data showing the second relationship, and at least the data showing the first relationship and the second Based on the determination results of the consistency determination unit 462 (first determination unit) for determining whether to correct the internal time based on the second reception time data and the determination result of the consistency determination unit 462 based on the data indicating the relationship between the two. It is provided with an internal time correction unit 44 that corrects the internal time.

By using the radio wave correction clock 1 according to the present embodiment, the second reception time data is acquired as the reception time data referred to for determining whether or not the internal time is corrected by the second reception time data. The first reception time data acquired in the first period prior to the second period is used. As such referenced reception time data, even if appropriate reception time data cannot be acquired in the second period, the first reception time data acquired in the first period can be used to obtain the first reception time data. Whether or not to correct the internal time can be determined from the reception time data of 2. This facilitates successful reception of standard radio waves.

Further, the radio wave correction clock 1 according to the present embodiment determines whether or not the first reception time data satisfies a predetermined standard (this standard is referred to as a first standard), and determines whether or not the second reception time data meets the second reception time data. The reception time data quality determination unit 463 (second determination unit) is provided to determine whether or not the data satisfies the first criterion, and the storage unit 42 (table TBL) is the first reception time data quality determination unit 463. With respect to the first reception time data determined to satisfy the criteria of, the data showing the first relationship is stored, and the second reception time determined by the reception time data quality determination unit 463 to satisfy the first criterion. For the data, the data showing the second relationship is stored.

As described above, the first criterion includes, for example, matching the parity of the TC corresponding to the acquired reception time data, and for example, "minute", "hour", and "year / month / day". Is included in the possible values.

As the first criterion (as the determination criterion in step S14 of the reception control process), for example, the difference (magnitude) between the acquired reception time data and the corresponding internal time data is a threshold value. It may include the following (for example, 10 minutes or less).

By improving the quality of the first reception time data and the second reception time data by the reception time data quality determination unit 463, the reliability of the correction of the internal time can be improved.

<Second Embodiment>
In the first embodiment described above, in the consistency determination process in step S17 of the reception control process, the reception time difference data which is the difference between the nth reception time data and the (ni) th reception time data. According to the comparison result between D1 and the internal time difference data D2 which is the difference between the nth internal time data and the (ni) th internal time data, the nth reception time data and (n) -I) An example of determining the consistency with the first reception time data has been described. In the second embodiment, another method of determining consistency will be described.

FIG. 9 is a flowchart of the consistency determination process according to the second embodiment. Steps S31 to S33 of the consistency determination process in the first embodiment are changed to steps S31A to S33A in the second embodiment.

In step S31A, the consistency determination unit 462 calculates the reception internal time difference data E1 (second reception internal time difference data) which is the difference between the nth reception time data and the nth internal time data. .. In step S32A, the consistency determination unit 462 receives the reception internal time difference data E2 (first reception) which is the difference between the (ni) th reception time data and the (ni) th internal time data. Internal time difference data) is calculated. In step S33A, the consistency determination unit 462 compares the reception internal time difference data E1 with the reception internal time difference data E2. If these match, it is determined that the nth reception time data and the (ni) th reception time data match.

In the example shown in FIG. 8, for example, the fifth reception time data "2: 9" corresponds to the internal time data "2: 6", for example, the second reception time data "1 o'clock". "6 minutes" corresponds to the internal time data "1: 3".

As described above, in the first embodiment, the difference D1 between the fifth reception time data "2: 9" and the second reception time data "1: 6" is plus 1 hour and 3 minutes. The difference D2 between the fifth internal time data "2:06" and the second internal time data "1: 3" is plus 1 hour and 3 minutes, and the difference D1 and the difference D2 match. By doing so, it is determined that the fifth reception time data is consistent with the second reception time data.

In such a matching relationship, the difference E1 between the fifth reception time data "2: 9" and the fifth internal time data "2: 6" is plus 3 minutes, and the second reception The difference E2 between the time data "1: 6" and the second internal time data "1: 3" is plus 3 minutes, which is equivalent to the fact that the difference E1 and the difference E2 match.

Therefore, the processes such as steps S31 to S33 of the first embodiment and the processes such as steps S31A to S33A of the second embodiment are consequentially equivalent, as in steps S31A to S33A of the second embodiment. The consistency of the nth reception time data may be determined by the above processing.

<Third Embodiment>
In the first embodiment and the second embodiment described above, in the data storage process in step S15 of the reception control process, an example in which the reception time data and the corresponding internal time data are stored in the table TBL as a pair has been described. .. In the third embodiment, as another method of the data storage process in step S15, an example in which the difference between the received time data and the corresponding internal time data is stored in the table TBL will be described.

FIG. 10 is a flowchart showing the data storage process according to the third embodiment. In the third embodiment, in step S20B, the reception time data quality determination unit 463 calculates the reception internal time difference data which is the difference between the reception time data acquired in step S13 and the corresponding internal time data. .. In step S21B, the reception time data quality determination unit 463 stores the reception internal time difference data calculated in step S20B in the table TBL.

FIG. 11 is an example of the data structure of the table TBL in the third embodiment. In the third embodiment, the reception internal time difference data U1 to U7 are stored in the table TBL. In the table TBL of this example, a maximum of seven received internal time difference data are stored.

The table TBL in the third embodiment stores the reception internal time difference data, which is the difference between the reception time data and the corresponding internal time data, so that the relationship between the reception time data and the internal time data (the relevant). Shows one aspect of the storage unit 42 that stores (relationship of the difference between the received time data and the internal time data).

FIG. 12 is a flowchart showing the consistency determination process in the third embodiment. In the third embodiment, the consistency determination process is also changed from the first embodiment (or the second embodiment) as the received internal time difference data is stored in the table TBL. Steps S31 and S32 of the consistency determination process in the first embodiment are omitted in the third embodiment, and step S33 of the consistency determination process in the first embodiment is changed to step S33B in the third embodiment. There is.

In step S33B, the consistency determination unit 462 receives the nth reception internal time difference data (second reception internal time difference data) and the (ni) th reception internal time difference data (first reception internal). Compare with time difference data). If these match, it is determined that the nth reception time data and the (ni) th reception time data match.

In this way, the received internal time difference data is stored in the table TBL, and the nth received internal time difference data is compared with the (ni) th received internal time difference data according to the comparison result. You may judge the consistency of the reception time data of.

In addition, in order to correct the internal time, the internal time corresponding to the reception time data determined to be consistent is required as the internal time before the correction. Although the internal time is not stored in the table TBL, it is stored in the storage unit 42 and is used for the correction process of the internal time.

According to the third embodiment, the storage unit 42 (table TBL) stores the reception internal time difference data, which is the difference between the reception time data and the corresponding internal time data. The amount of data stored in the storage unit 42 (table TBL) can be reduced as compared with the configuration in which the (table TBL) stores each of the reception time data and the internal time data.

Further, by configuring the consistency determination unit 462 to process the received internal time difference data, the consistency is matched as compared with the configuration in which the consistency determination unit 462 processes the received time data and the internal time data. The amount of processing performed by the sex determination unit 462 can be reduced.

<Fourth Embodiment>
As described in the first to third embodiments described above, the consistency of the reception time data is determined by referring to the reception time data acquired in the past. In this determination, the relationship between the reception time data that is the target of the consistency determination and the internal time data corresponding to the reception time data (the second relationship described above), and the referenced reception time data and the reception time data. The relationship with the internal time data corresponding to (the first relationship described above) is used.

Here, the internal time data corresponding to the reception time data subject to the consistency determination is referred to as the determination target internal time data, and the internal time data corresponding to the referenced reception time data is referred to as reference internal time data.

The internal time shifts due to the rate. Therefore, if the internal time of the determination target internal time data and the internal time of the reference internal time data are excessively separated, the reliability of the internal time decreases, and the reliability of the consistency determination decreases. As a result, the reliability of the internal time adjustment is reduced.

In order to suppress such a decrease in reliability of the internal time correction, the difference between the determination target internal time data (second internal time data) and the reference internal time data (first internal time data) is predetermined. It may be determined whether or not the criteria (this criterion is called a second criterion) is satisfied. If the difference meets the second criterion and is small, the first relationship described above is used to determine consistency (to determine whether to modify the internal time) and the difference is the second. If it does not meet the criteria of and is large, the above-mentioned first relationship is not used in the determination of consistency (in the determination of whether to correct the internal time).

When the difference is small, it is possible to suppress the deviation caused by the step between the determination target internal time data and the reference internal time data, and it is possible to improve the reliability of the correction of the internal time.

As the fourth embodiment, an example of an embodiment in which such a deviation due to the rate between the determination target internal time data and the reference internal time data will be described will be described. In the present embodiment, a certain time scheduled reception process, which is performed after the times when the reception is determined to have failed and the scheduled reception process is completed, will be described. As a assumed situation, for example, a state in which the reception environment is very bad continues for several days or more, and reception failure continues in the scheduled reception process performed during that period.

FIG. 13 is a flowchart showing a scheduled reception process according to the fourth embodiment. The difference from the scheduled reception process in the first embodiment is that steps S40 to S43 are added prior to the reception start process in step S1.

First, in step S40, the internal time data quality determination unit 464 determines whether the reception failure period is shorter than the threshold period (for example, 30 days). The reception failure period (for example, the number of days) is stored in the storage unit 42.

When the reception failure period is equal to or longer than the threshold period, the internal time data quality determination unit 464 deletes all the data stored in the table TBL in step S41, and initializes the data storage number n to 0 in step S42. In step S43, the reception failure period (number of days) is initialized to 0. When step S43 is performed, the reception start process of the current scheduled reception process is performed in step S1.

Since reception is started after all the data stored in the table TBL is deleted, the data is stored in the table TBL from the first data in the scheduled reception process this time. Therefore, the consistency of the reception acquisition data acquired in the current scheduled reception process is determined without referring to the reception time data acquired in the scheduled reception process earlier than this time.

If the reception failure period is shorter than the threshold period, steps S41 to S43 are skipped, and in step S1, the reception start process of the current scheduled reception process is performed. In this case, by skipping step S41, the data stored in the table TBL is retained, and by skipping step S42, the number of stored data n is retained without being initialized. The reception time data acquired in the scheduled reception process this time is additionally stored in the table TBL, and the stored number n is additionally stored. Therefore, the consistency of the reception time data acquired in the scheduled reception process this time is determined by referring to the reception time data acquired in the scheduled reception process earlier than this time.

When the reception failure period is equal to or longer than the threshold period, the table TBL may store old reception time data acquired at an internal time equal to or longer than the threshold period of the reception start time of the current scheduled reception process. The old internal time corresponding to this old reception time data has a large deviation due to the rate with respect to the internal time after the start of reception of the scheduled reception process this time, and the reliability is lowered.

When the reception failure period is equal to or longer than the threshold period, by deleting all the data stored in the table TBL in step S41, it is possible to determine the consistency of the reception time data acquired in the scheduled reception process this time. It is possible to prevent the old reception time data acquired at the low old internal time from being referenced. As a result, the reliability of the consistency determination can be increased, and the reliability of the internal time adjustment can be increased.

The difference evaluated in minutes between the received time data and the corresponding internal time data is shifted by ± 1 minute or more compared to the case where the internal time is not shifted by ± 30 seconds or more. Is estimated. If the difference deviates by ± 1 minute or more, the consistency determination is not performed accurately. When the monthly difference is ± 15 seconds, the above-mentioned threshold period may be set to, for example, 30 days as a value with a margin.

<Fifth Embodiment>

In the fourth embodiment described above, the case where the internal time shifts due to the rate has been described. The internal time also shifts when the user operates the operation unit 7 to change the internal time. When the internal time change process for changing the internal time is performed, the continuity of the internal time is not maintained, so that the reliability of the consistency determination is lowered. As a result, the reliability of the internal time adjustment is reduced.

In order to suppress such a decrease in reliability of the internal time correction, an internal time is set between the internal time corresponding to the received time data to be checked for consistency and the internal time corresponding to the referenced received time data. It may be determined whether or not the time change process has been performed. If the internal time change process is not performed, the above-mentioned first relationship is used for the determination of consistency (to determine whether to correct the internal time), and if the internal time change process is performed, the internal time change process is performed. , The above-mentioned first relationship is not used in the determination of consistency (in the determination of whether to correct the internal time).

Since the internal time change processing is not performed between the internal time corresponding to the reception time data to be the target of the consistency judgment and the internal time corresponding to the referenced reception time data, these internal time data Since the continuity is maintained between them, the reliability of the correction of the internal time can be improved.

As a fifth embodiment, an example of an embodiment in which the deviation of the internal time data due to the internal time change processing can be suppressed will be described. In the present embodiment, the scheduled reception process performed after the scheduled reception process that is determined to have failed and ended will be described.

FIG. 14 is a flowchart showing a scheduled reception process according to the fifth embodiment. The difference from the scheduled reception process in the first embodiment is that steps S50 to S52 are added prior to the reception start process in step S1.

First, in step S50, the internal time data quality determination unit 464 determines whether or not the internal time has been changed (manually) by the operation of the operation unit 7.

When the internal time is changed, the internal time data quality determination unit 464 deletes all the data stored in the table TBL in step S51, and initializes the data storage number n to 0 in step S52. When step S52 is performed, reception start processing of the current scheduled reception processing is performed in step S1.

Since reception is started after all the data stored in the table TBL is deleted, the data is stored in the table TBL from the first data in the scheduled reception process this time. Therefore, the consistency of the reception acquisition data acquired in the current scheduled reception process is determined without referring to the reception time data acquired in the scheduled reception process earlier than this time.

If the internal time is not changed, step S51 and step S52 are skipped, and in step S1, the reception start processing of the current scheduled reception processing is performed. In this case, by skipping step S51, the data stored in the table TBL is retained, and by skipping step S52, the number of stored data n is retained without being initialized. The reception time data acquired in the scheduled reception process this time is additionally stored in the table TBL, and the stored number n is additionally stored. Therefore, the consistency of the reception time data acquired in the scheduled reception process this time is determined by referring to the reception time data acquired in the scheduled reception process earlier than this time.

When the internal time is changed, by deleting all the data stored in the table TBL in step S51, the internal time change process is performed to determine the consistency of the received time data acquired in the scheduled reception process this time. It is possible to prevent the reception time data acquired at the internal time before the data from being referred to. As a result, the reliability of the consistency determination can be increased, and the reliability of the internal time adjustment can be enhanced.

<Modification example>
The present invention is not limited to the above-described embodiment, and various modifications such as those described below are possible. In addition, one or a plurality of arbitrarily selected modifications may be appropriately combined in the following modification modes and embodiments.

In the above-described embodiment, the case where the scheduled reception process is started at 1:00, 2:00, and 3:00 is illustrated, but the scheduled reception process may be started at another time, if necessary. .. Further, for convenience of explanation, the case where each reception process is started at a fixed time every day is illustrated, but the reception process may not be started at a fixed time every day. The user may operate the operation unit 7 to set the start time of the reception process.

In the above-described embodiment, the reception time data used for determining the consistency and the internal time data corresponding to the data indicating "year, month, day, hour, minute" are used, but if necessary, for example, "year". You may use the one indicating "month, day, hour, minute, second".

In the above-described embodiment, the definition of calculating the difference between the time data A and the time data B by "time data A-time data B" is illustrated. However, if necessary, the difference is calculated by "time data B". -The definition calculated by "time data A" may be adopted.

1 ... Radio correction clock, 2 ... Antenna, 3 ... Reception circuit, 4 ... Processing unit, 5 ... Oscillator, 6 ... Display unit, 7 ... Operation unit, 8 ... Receiver unit, 31 ... Tuning circuit, 32 ... First amplifier circuit , 33 ... local oscillation signal generation unit, 34 ... frequency conversion unit, 35 ... BPF, 36 ... second amplifier circuit, 37 ... detection circuit, 38 ... binarization circuit, 39 ... decoding circuit, 41 ... time data acquisition unit, 42 ... storage unit, TBL ... table, 43 ... timing unit, 44 ... internal time correction unit, 45 ... drive unit, 46 ... control unit, 461 ... reception timing control unit, 462 ... consistency determination unit, 463 ... reception time data Quality determination unit, 464 ... Internal time data quality determination unit.

Claims (6)

A receiver that receives standard radio waves and
The standard radio wave is received in the first period, the reception of the standard radio wave is stopped when the first period elapses, and the standard radio wave is received in the second period after the first period. A reception timing control unit that controls the reception unit so as to stop the reception of the standard radio wave when the second period elapses.
The first reception time data is acquired based on the standard radio wave received by the receiving unit in the first period, and the second reception time data is obtained based on the standard radio wave received by the receiving unit in the second period. The time data acquisition unit that acquires the reception time data of
The relationship between the first reception time data and the first internal time data indicating the internal time at the time of acquisition of the first reception time data is defined as the first relationship, and the second reception time data and the said second reception time data. When the relationship with the second internal time data indicating the internal time at the time of acquiring the second reception time data is defined as the second relationship, at least the data indicating the first relationship and the second relationship are defined. A storage unit that stores the data to be shown,
At least, a first determination unit that determines whether or not to correct the internal time with the second reception time data based on the data indicating the first relationship and the data indicating the second relationship.
An internal time correction unit that corrects the internal time based on the determination result of the first determination unit is provided .
The first determination unit
When the difference between the second internal time data and the first internal time data satisfies the predetermined second criterion and is small, the first relationship is established by the second reception time data. Used to determine whether to correct the internal time
If the difference does not satisfy the second criterion and is large, the first relationship is not used in determining whether to correct the internal time with the second reception time data.
Radio correction clock. A receiver that receives standard radio waves and
The standard radio wave is received in the first period, the reception of the standard radio wave is stopped when the first period elapses, and the standard radio wave is received in the second period after the first period. A reception timing control unit that controls the reception unit so as to stop the reception of the standard radio wave when the second period elapses.
The first reception time data is acquired based on the standard radio wave received by the receiving unit in the first period, and the second reception time data is obtained based on the standard radio wave received by the receiving unit in the second period. The time data acquisition unit that acquires the reception time data of
The relationship between the first reception time data and the first internal time data indicating the internal time at the time of acquisition of the first reception time data is defined as the first relationship, and the second reception time data and the said second reception time data. When the relationship with the second internal time data indicating the internal time at the time of acquiring the second reception time data is defined as the second relationship, at least the data indicating the first relationship and the second relationship are defined. A storage unit that stores the data to be shown,
At least, a first determination unit that determines whether or not to correct the internal time with the second reception time data based on the data indicating the first relationship and the data indicating the second relationship.
An internal time correction unit that corrects the internal time based on the determination result of the first determination unit is provided .
The first determination unit
If the internal time change process for changing the internal time is not performed between the internal time corresponding to the first internal time data and the internal time corresponding to the second internal time data, the first Is used to determine whether to correct the internal time based on the second reception time data.
When the internal time change process is performed, the first relationship is not used for determining whether or not to correct the internal time based on the second reception time data.
Radio correction clock. A second determination of determining whether the first reception time data satisfies the predetermined first criterion and determining whether the second reception time data satisfies the first criterion. Department,
With
The storage unit stores data indicating the first relationship with respect to the first reception time data determined by the second determination unit to satisfy the first criterion, and the second determination unit. Stores data indicating the second relationship with respect to the second reception time data determined to satisfy the first criterion.
The radio wave correction clock according to claim 1 or 2. The data showing the first relationship includes the first reception time data and the first internal time data.
The data showing the second relationship includes the second reception time data and the second internal time data.
The first determination unit
The reception time difference data, which is the difference between the second reception time data and the first reception time data, is calculated.
The internal time difference data, which is the difference between the second internal time data and the first internal time data, is calculated.
The reception time difference data is compared with the internal time difference data, and it is determined whether or not to correct the internal time with the second reception time data according to the comparison result.
The radio wave correction clock according to any one of claims 1 to 3. The data showing the first relationship includes the first reception time data and the first internal time data.
The data showing the second relationship includes the second reception time data and the second internal time data.
The first determination unit
The first reception internal time difference data, which is the difference between the first reception time data and the first internal time data, is calculated.
The second reception internal time difference data, which is the difference between the second reception time data and the second internal time data, is calculated.
The first reception internal time difference data is compared with the second reception internal time difference data, and it is determined whether or not to correct the internal time with the second reception time data according to the comparison result.
The radio wave correction clock according to any one of claims 1 to 3. The data showing the first relationship includes a first reception internal time difference data which is a difference between the first reception time data and the first internal time data.
The data showing the second relationship includes the second reception internal time difference data which is the difference between the second reception time data and the second internal time data.
The first determination unit
The first reception internal time difference data is compared with the second reception internal time difference data, and it is determined whether or not to correct the internal time with the second reception time data according to the comparison result.
The radio wave correction clock according to any one of claims 1 to 3.

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