JP2009216432A - Radio-controlled timepiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that in a radio-controlled timepiece minute data is updated by stepping during reception, thereby avoiding false reception of calendar data through the comparison of received day of the week with the day of the week obtained by calculation from received date, but hour data is not provided with an appropriate comparison means. <P>SOLUTION: The radio-controlled timepiece includes a receiving means 101 for receiving a standard time and frequency signal including a standard time information signal and a control means 103 for correcting the measured time of a timing means 104 on the basis of the current time determined by a reception data comparison means 102 for performing comparison using reception data with different hour digits. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a radio-controlled timepiece, an electronic device, and a time correction method for receiving a standard radio wave including a standard time information signal and correcting the time based on the standard time information signal applied to the received standard radio wave.

  Conventionally, in a radio-controlled timepiece that receives a standard radio wave including a standard time information signal and corrects the time based on the standard time information signal applied to the received standard radio wave, a standard time having one cycle of 1 minute (60 seconds) The information signal is held for a plurality of cycles (for example, 3 minutes (3 cycles) to 5 minutes (5 cycles)), and the time to be corrected is determined by comparing the contents of each signal. In order to improve the reliability of the received standard radio wave, the time was corrected accurately.

The details of reception of the radio clock are described below.
FIG. 10a is a timing chart for explaining the time code of each country.
As for the standard time signal, one bit is transmitted in one second, and each bit has a code shown in FIG. 10a (after demodulation).

That is, as shown in the figure, although the waveforms are different in the United States, Japan, and Germany, the waveforms determined by the codes “0”, “1”, and “P” are taken. (In Germany, it is called “M” code, but since it plays the same role as “P”, it will be called “P” for the sake of convenience.) Also, the starting point of each bit can be known by the time code of each country. . For example, when the time code falls for the US code, it is when the time code rises for the Japanese code. Since the start time of each bit is a positive second, it is possible to adjust the clock holding time to the positive second by detecting this point. This positive second is called the second synchronization position, and the second synchronization position is detected. Is called second synchronization detection.
Further, the transmission code (0, 1, P) of the standard time signal can be determined by determining the detection of the second synchronization position.

FIG. 10b is a table showing the weighting of the transmission code (0, 1, P) based on the timing of 0 seconds.
As shown in FIG. 10b, in order to easily detect the second of the time as 0 seconds in Japan and the United States, the P code is continuous with the 0 second therebetween, and in Germany, the second second of the M code is 0 second. Thus, the 0 second position of the standard time signal can be recognized by the arrangement of the transmission codes (0, 1, P). This 0 second position is called the minute synchronization position, and detecting the minute synchronization position is called minute synchronization detection.

  Weighting of the transmission code of the standard time signal by determining the minute synchronization position (hour data, minute data, day data, year data, day of the week data, parity, ten digits, one digit, 0 bits, 1 bit, 2 bits, 3 bits, etc.) Can be recognized and the standard time can be read. (The standard time data read at this stage is hereinafter referred to as received data.)

  As described in Patent Document 1 or the like, the read standard time data is stored as standard time data received every minute, and 0 and 1 generated due to noise or the like by collating the accumulated data with each other. Incorrect time data due to a reading error (hereinafter referred to as a miscode) is not recognized (hereinafter referred to as erroneous reception). (Hereinafter, the standard time data obtained as a result of collation is referred to as reception collation data.)

Also, it is checked whether or not there is non-existent data in each data (minute, hour, day, year, day of the week). For example, it is checked whether there is nonexistent data such as 69 minutes. (Hereafter, this collation is called non-existent collation.)

Further, the received collation data is subjected to related collation such as whether it matches the day of the week data and year data and the day of the week calculated from the accumulated date data as described in Patent Document 2 (hereinafter, this day of week data and year data, accumulated The related collation of the day data is referred to as day collation), and becomes the time data to be corrected. (Hereinafter, the obtained standard time data is referred to as reception time data.)
Japanese Patent Laid-Open No. 11-304973 Japanese Patent Laid-Open No. 9-43369

However, in the above prior art, there are cases where the current time cannot be determined accurately even if standard time information signals for a plurality of cycles are used.
Especially when the place where data is missed regularly (specific bit) due to noise is the same, the minute data is carried every minute, so the time data fluctuates every time. It can be recognized that.

However, since the time data, date data, year data, and day of the week data are not changed during reception, it cannot be recognized that they are incorrect time data at the collation stage.
In normal reception and verification, this is completed in about 10 minutes at most (conversely, if it is likely to take longer than this, the reception is forcibly interrupted due to power consumption) This is because there is almost no possibility that the data change point occurs during reception / verification.

However, since the date data, the year data, and the day of the week data are related to each other as described in Patent Document 2, it is possible to recognize that the time data is incorrect at the stage of the day of the week comparison. Unlikely, erroneous reception is unlikely to occur.
For this reason, the time data that is most likely to cause erroneous reception of the radio timepiece is time digit data.
As described above, erroneous reception of the hour digits also occurs in units of bits, so that most of them occur in units of 2 hours or 4 hours, resulting in a large time correction error, which reduces the reliability of the radio clock.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a radio-controlled timepiece, an electronic device, and a time correction method that can correct the time more accurately in order to solve the above-described problems caused by the prior art.

In order to solve the above-described problems and achieve the object, the radio-controlled timepiece according to the present invention is a receiving unit that receives a radio signal having time data and a reception unit that generates reception verification data from a reception code output from the receiving unit. Reception data storage means for storing the reception verification data generated by the data verification means and the reception data verification means, control means for controlling the reception means and the reception data verification means, and reception time data generated by the reception data verification means It has time measuring means for measuring time originally,
The reception data collating means collates reception data using the reception collation data having a time digit different from that of the reception data, and generates reception time data.

Further, the radio-controlled timepiece according to the present invention is the above invention,
If the reception status is not in a predetermined condition, store at least the time digit data acquired from the reception means in the reception data storage means and terminate the reception operation,
At the timing when the time digits are estimated to be different, receive again,
The received data is collated including the received data stored in the received data storage means.

Since the collation method of the radio-controlled timepiece according to the present invention makes it possible to collate two or more time digits, the collation accuracy of the reception time data can be increased.
For example, in the state of receiving the time data of 1 o'clock, the output code of 1 digit in FIG. 10b is 0001 bin, but due to the influence of noise or the like (assuming that the 2 and 4 data digits are 1) 0111 bin In this case, the time code is 7 o'clock in the conventional collation method. However, in the collation method in the present invention, for example, 2 o'clock data having different time digits is also acquired.
The output code at 2 o'clock is 0010 bin, but it is 0110 bin under the above noise conditions, so the time code is 6 o'clock, and the time code is subtracted from 7 o'clock to 6 o'clock, even though it has advanced by 1 hour Therefore, it can be determined that the time data is not correct.

Further, the radio-controlled timepiece according to the present invention is the above invention,
The reception time data whose minute digit data is before 59 minutes and after 00 minutes is obtained.

  Since the collation method of the radio-controlled timepiece according to the present invention receives over the 00 minute when the hour digit rises, it is possible to acquire two or more hour digit data by one reception. It is possible to increase the accuracy of data collation and further reduce the reception current consumption.

Further, the radio-controlled timepiece according to the present invention is the above invention,
If the minute digit of the reception start time is in a predetermined time range, the reception time is extended for a predetermined time so that the reception data with the minute digit after 00 minutes can be obtained,
The reception time is not extended when it is out of the predetermined time range.

The reception time is extended only in the time zone that passes 00 minutes in a short time even when receiving irregular times, such as when forcibly receiving according to instructions from the user, by the method of checking a radio-controlled clock of the present invention. Therefore, it is not necessary to perform reception for a long time.
For example, if reception starts from 00 minutes, it takes at least one hour to obtain received data with different time digits, but if reception starts from 55 minutes, the minimum reception time is 6 minutes, and the received current consumption And the discomfort to the user due to restriction of the clock function during reception (due to noise reduction, the clock does not move in seconds, LCD display is not performed, etc.).
The predetermined time range is preferably 30 minutes to 59 minutes, more preferably 45 minutes to 55 minutes.
As a reason for the 55 minutes, the time data cannot be acquired immediately even if the reception is started, but the reception time data can be acquired only after the second synchronization detection step and the minute synchronization detection step. Assuming a time of 4 minutes, the remaining 1 minute can acquire data before the time digit data is changed.

Further, the radio-controlled timepiece according to the present invention is the above invention,
When the minute digit of the received data obtained by the received data collating means is within a predetermined time range, the reception time is extended for a predetermined time so that the received data with the minute digit after 00 minutes is obtained,
The reception time is not extended when it is out of the predetermined time range.

With the radio wave correction clock collation method of the present invention, the reception time is extended only in a time zone close to 00 minutes when receiving an irregular time such as forcibly receiving according to an instruction from the user. There is no need to perform cross reception.
For example, when the received data is 00 minutes, it takes at least one hour to obtain received data with different time digits, but when the received data is 55 minutes, the minimum received time is 6 minutes. It can eliminate discomfort to the user due to the reduction of current consumption and the limitation of the clock function during reception (due to noise reduction, the clock does not move in seconds, LCD display is not performed, etc.).
The predetermined time range is preferably 30 minutes to 59 minutes, more preferably 55 minutes to 59 minutes.

Further, the radio-controlled timepiece according to the present invention is the above invention,
The reception time is different for a predetermined period of time in the previous period, depending on whether the reception condition is in a predetermined condition or when the reception condition is not in a predetermined condition.

By the collation method of the radio-controlled timepiece of the present invention,
When it is considered that there is no miscode, such as when the received radio wave intensity is high or the influence of noise is low, the received data is accurate even without matching using different time digits of received data. Therefore, it is not necessary to extend the reception time, and the current consumption can be reduced because the reception time is shortened.

Further, the radio-controlled timepiece according to the present invention is the above invention,
Memorize the scheduled reception time that automatically starts receiving time data,
In a radio timepiece having a scheduled reception storage means for outputting a reception time to the control means, the scheduled reception time stored in the scheduled reception storage means is a timing at which the minute digit is not 00 minutes.

Further, the radio-controlled timepiece according to the present invention is the above invention,
The reception data collating means first generates reception time data when the minute digit of the time measuring means is between 30 minutes and 59 minutes.

The scheduled reception time is a time at which the clock automatically performs a reception operation. When reception starts from 00 minutes, the shortest reception time becomes 1 hour or more, so the reception time becomes longer and the current consumption increases. turn into.
For this reason, it is desirable that the scheduled reception time has at least a minute digit between 30 minutes and 59 minutes.

Further, the radio-controlled timepiece according to the present invention is the above invention,
The scheduled reception time stored in the scheduled reception storage means is received across 00 minutes of an even time in the hour digits.

Since the data of the transmission signal of the standard time signal is a binary code in which 0 and 1 codes are combined, it must be received when the time digit is received across even time (when receiving from odd time to even time). In order to cause a carry, two or more fluctuating bit numbers are generated.
On the other hand, when receiving across time with an odd number of digits (when receiving from an even number of time to an odd number of times), the carry does not always occur, so the number of bits that fluctuate is always the least significant bit of one digit per hour. Only 1 bit.
As will be described later, the present invention is more effective as the number of bits that fluctuate with the carry of the hour digit increases (the accuracy of detecting erroneous reception of the hour digit increases). It is desirable to set the time to receive over 00 minutes.

Further, the radio-controlled timepiece according to the present invention is the above invention,
At least one of the scheduled reception times stored in the scheduled reception storage means receives a reception operation across 0:00.

When the reception operation is received across midnight, not only can the received data of different time digits be acquired, but also the received data of different day digits can be acquired, so that the accuracy of detecting erroneous reception of the received data of the day digits is also improved. I can do it.

Further, the radio-controlled timepiece according to the present invention is the above invention,
When receiving operation according to the scheduled reception time stored in the scheduled reception storage means, the reception time varies depending on the date data of the timing means.

If the reception operation is received across 0:00, the received data with different date digits can be acquired, but the accuracy of detecting the erroneous reception of the received data with the day digits differs depending on the numerical value of the received date digits. When the accuracy of collation is low for day-digit data, the accuracy of the second and minute is maintained by setting the reception collation to the second synchronization detection or minute synchronization detection, and the current consumption is reduced by shortening the reception time. it can.
Further, when the date data of the time measuring means has a high accuracy of collation, the time accuracy of the clock including all of the seconds, minutes, hours, days, days of the week, and years is ensured by performing reception according to the present invention. I can do it.

Further, the radio-controlled timepiece according to the present invention is the above invention,
The scheduled reception storage means stores an arbitrary reception time at which a user can arbitrarily set a periodic reception time to be automatically received,
In the radio timepiece having external input means for outputting the arbitrary reception time data to the scheduled reception time storage means by an external input operation, the arbitrary setting time can be set up to a minute digit.

Further, the radio-controlled timepiece according to the present invention is the above invention,
At least one of the arbitrarily set time digits can be set to 00 minutes.

Further, the radio-controlled timepiece according to the present invention is the above invention,
At least one of the initial setting values for setting the minute digits of the arbitrary setting time is not 00 minutes.

Further, the radio-controlled timepiece according to the present invention is the above invention,
It is possible to select to extend the reception time in the previous period.

  According to the present invention described above, since the user can select the method for collating the radio-controlled timepiece of the present invention, it is possible to realize a radio-controlled timepiece that performs reception according to the user's preference.

According to the present invention, it is possible to obtain a radio-controlled timepiece that can correct the time more accurately.

  Exemplary embodiments of a radio-controlled timepiece, an electronic device, and a time correction method according to the present invention will be explained below in detail with reference to the accompanying drawings.

(Functional configuration of radio-controlled clock)
First, a functional configuration of the radio-controlled timepiece will be described. FIG. 1 is an explanatory diagram showing a functional configuration of a radio-controlled timepiece according to an embodiment of the present invention.

In FIG. 1, a radio-controlled timepiece 100 receives a standard radio wave including a standard time information signal, and outputs a reception code 101 of 0 code, 1 code, or P code, and controls the reception means 101. Control having both means: decoding means 103 for decoding received data from the received code output from receiving means 101; and collating means 105 for collating the received data created by decoding means 103 and generating received collation data Means 102, data storage means 110 for storing the received collation data obtained by collation means 105, time measuring means 112 for stepping the received time data, and displaying the time data and the reception state of time measuring means 112 Display means 113 and the radio-controlled timepiece 100 automatically perform reception (hereinafter referred to as scheduled reception). The reception time storage unit 107 and the external input unit 111 for allowing the user to forcibly receive the radio-controlled timepiece 100 or changing the setting of the scheduled reception time are configured.

Further, the scheduled reception time storage means 107 includes a fixed reception time storage means 108 in which the user cannot arbitrarily change the scheduled reception time, and an arbitrary reception time storage means 109 in which the user can arbitrarily change the scheduled reception time. 110 includes received data storage means A104 and received data storage means B114 for storing different received collation data, and collation means 105 is used for comparing and collating received data storage means A104 and received data storage means B114 stored in data storage means 110. The verification unit 106 is included.

  When the control means 102 receives an instruction from the user to force reception by the external input means 111 (hereinafter referred to as forced reception), or the fixed reception stored in the scheduled reception time storage means 107. When either the time 108 or the arbitrary reception time 109 coincides with the time measured by the time measuring means 112, a reception command 115 is output to the receiving means 101, and a reception display state is set.

  The receiving unit 101 receives a standard radio wave including a standard time information signal, detects a second synchronization position based on the standard time information signal applied to the received standard radio wave, and receives a reception code 116 of 0 code, 1 code, and P code. Is output to the decoding means 103.

The decoding unit 103 detects the minute synchronization position from the reception code 116 transmitted from the reception unit 101, and outputs the reception data 120 to the collation unit 105.
The collation means 105 obtains a plurality of reception data 120 obtained from the decoding means 103, generates the most matched data as reception collation data, performs day of the week collation and non-existence collation for the reception collation data, If the day of week data matches and there is no nonexistent data, the reception verification data is stored in either the reception data storage means A104 or the reception data storage means B114 of the data storage means 110.

When there is data in both the received data storage means A104 and the received data storage means B114 of the data storage means 110, the time collating means 106 is the elapsed time difference between the received data storage means A104 and the received data storage means B114 (the received data A104 and the current data (Difference from transmission time) is added to the reception data storage means A104 and compared with the reception data storage means B114. If they match, the reception is successful and the standard time data is obtained.

When the reception is successful, the control unit 102 changes the time measured by the time measuring unit 112 to the acquired standard time data, stops the output of the reception command 115, and ends the reception operation.
Further, the arbitrary reception time storage means 109 of the fixed reception time storage means 107 can arbitrarily set the fixed reception time by setting an arbitrary time from the external input means 109.

(Contents of reception processing)
(First embodiment)
Next, the contents of the process of the time correction method according to the first embodiment of the present invention will be described with reference to the drawings.
The first embodiment shows a case where collation is performed by performing regular reception twice at different times and comparing time data at the time of each reception.
In the first embodiment, FIG. 2 is a flowchart showing the processing procedure of the time adjustment method according to the first embodiment of the present invention, and FIG. 3 shows the transmission time of the standard time information signal and the received data A104 in the first embodiment. 11 shows the relationship between the reception data B114, and FIG. 11 shows the relationship between the transmission time in the first embodiment and the storage processing of the reception data storage means A104 and the reception data storage means B114. In the first embodiment, the fixed reception time storage means 108 The contents will be described as 1 o'clock (points to 1 am, and will be described in a 24-hour format) and 2 o'clock.

  When the timekeeping content of the timekeeping means 112 becomes 1 o'clock, it coincides with the data of 1:00 in the fixed reception time storage means 108, so the routine proceeds to step S202 as scheduled reception 1 (step S201: YES). In step S202, the control unit 102 outputs a reception command 115, and the reception unit 101 receives a standard radio wave including a standard time information signal. Second synchronization detection is performed from the received standard radio wave, and minute synchronization detection is performed by the decoding means 103 so that received data can be acquired.

Next, in step S203, the collation unit 105 obtains a plurality of received data obtained from the decoding unit 103, generates the most matched data as reception collation data, and checks the day of the week for the received collation data. The collation is confirmed, and if the day data matches and there is no nonexistent data, the process proceeds to step S204.
In step S204, the reception collation data is stored in the reception data storage means A104 of the data storage means 110, the reception operation is terminated (the control means 102 stops outputting the reception command 115), and the routine proceeds to step S201. .

  Next, when the timekeeping content of the timekeeping means 112 becomes 2 o'clock, it coincides with the data at 2:00 in the fixed reception time storage means 108, so that the process proceeds to step S206 as scheduled reception 2 (step S205: YES), and the control is performed in step S206. The means 102 outputs a reception command 115, starts a reception operation, the reception means 101 receives a standard radio wave including a standard time information signal, performs second synchronization detection from the received standard radio wave, and the decoding means 103 detects minute synchronization. So that the received data can be acquired.

  Next, as step S207, the collation means 105 obtains a plurality of received data obtained from the decoding means 103, generates the most matched data as reception collation data, and performs day-of-week collation for the received collation data. The collation is confirmed, and if the day of week data matches and there is no nonexistent data, the process proceeds to step S208, the received collation data is stored in the received data storage means B114 of the data storage means 110, and the process proceeds to step S209.

Next, as step S209, received data storage means A104 of the data storage means 110,
The two data collations of the reception data storage means B114 are performed (hereinafter, data consistency check including the reception storage data is referred to as reception storage data verification), and the process proceeds to step S210.

A collation method for collation of received and stored data in step S209 will be described with reference to FIG.
FIG. 3a shows a miscode in which a 1-digit hourly D1 bit is mistaken for a zero code as a 1 code and a scheduled reception 1 is performed. FIG. The relationship between the reception time and the received stored data when the scheduled reception 2 is performed in the state where the error occurs is shown.

As shown in FIG. 3a, scheduled reception 1 is performed, and the reception data storage means A104 becomes 3:10 when the transmission time is 1:10 due to a miscode generated in the D1 bit of one hour.
Next, when the scheduled reception 2 is performed, the hourly 1-digit D1 bit code is 1, so that the reception data storage unit B114, as shown in FIG. The same 2:10.
However, when the received data storage means A104 adds the elapsed time difference, it becomes 4:10 when the transmission time is 2:10.

As described above, when the transmission time is 2:10, reception data storage means A104 is 4:10, reception data storage means B114 is 2:10, and reception is unsuccessful because there is no time match. Thus, erroneous reception can be detected.
If no miscode occurs, the reception data storage means A104 has a transmission time of 1:10 when the transmission time is 1:10, and is the same as the transmission time at the transmission time of 2:10 in scheduled reception 2. At 2:10, the reception data storage means B114 coincides with the reception success.

Further, the relationship between the transmission time and the accumulation process of the reception data storage unit A104 and the reception data storage unit B114 will be described with reference to FIG.
In scheduled reception 1, reception processing is performed in step S202. However, since second synchronization detection, minute synchronization detection, and the like are performed, reception processing is required for about two minutes from the start of reception.

Thereafter, the process proceeds to step S203, reception verification data is generated, day-of-week verification and non-existence verification are completed, the process proceeds to step S204, data accumulation is started in the reception data storage means A104, and reception is performed regularly at 1:10. Exit.
Next, reception is started again at scheduled reception 2 and reception processing is performed in step S206. However, since second synchronization detection and minute synchronization detection are performed, reception processing is required for about two minutes from the start of reception.

  Thereafter, the process proceeds to step S207, where reception collation data is generated, day of the week collation and non-existence collation are completed, and the process proceeds to step S208 where data accumulation is started in the reception data storage means B114 and accumulation is performed at 2:10. The process ends, and the received data collation is performed from 2:11.

After collation of the received storage data collation is completed and the process proceeds to step S210, if the reception is successful in step S209 in step S210 (step S210: YES), the process proceeds to step S211 and the time measuring means 112 The clocking time is corrected, the process proceeds to step S213, and the receiving operation is terminated.
In step S210, if reception has failed in step S209 (step S211: NO), the process proceeds to step S212, a reception failure display is performed on the display unit 113, the process proceeds to step S213, and the reception operation is terminated. .

In step S203, the day of the week collation and the nonexistent collation are confirmed. If the day of the week data does not match or the nonexistent data exists, the process proceeds to step S212, the reception failure process is performed, and the next scheduled time is reached. The scheduled reception 2 is not performed until the reception 1 is performed.
In step S207, the day of the week collation and the non-existent collation are confirmed. If the day of week data does not match or the non-existent data exists, the process proceeds to S212, and the reception failure process is performed.

  Further, in step S203 of the scheduled reception 1, when the reception condition of the standard time information signal is good and it is assumed that no miscode occurs (for example, when the electric field strength is large, the generation of noise is small). In the case), the process does not proceed from step S203 to step S204, but proceeds to step S211 to perform the reception success process and not to perform the scheduled reception 2 so that the reception time can be reduced and the reception current consumption can be reduced.

  As described above, the occurrence rate of erroneous reception of time digit data can be greatly reduced by collating different time digit data.

(Second embodiment)
Next, the contents of the process of the time correction method according to the second embodiment of the present invention will be described with reference to the drawings.
The second embodiment is an embodiment in which time collation is performed by performing reception such that there is a time digit update in the middle of reception.
In the second embodiment, FIG. 4 is a flowchart showing the processing procedure of the time adjustment method according to the second embodiment of the present invention. FIG. 5 shows the transmission time of the standard time information signal and the received data A104 in the second embodiment. FIG. 12 shows the relationship between the transmission time and the storage processing of the reception data A104 and the reception data B114 in the second embodiment.
In the second embodiment, the content stored in the arbitrary reception time storage unit 109 will be described as 23:55.

  In FIG. 4, when the timekeeping content of the timekeeping means 112 reaches 23:55, it matches the 23:55 data in the arbitrary reception time storage means 108, so the process proceeds to step S402 as optional reception (step S401: YES), The control means 102 outputs a reception command 115, receives the standard radio wave including the standard time information signal at the reception means 101, performs second synchronization detection from the received standard radio wave, performs minute synchronization detection at the decoding means 103, and receives the received data. To be able to get

  Next, as step S403, the collating unit 105 acquires a plurality of pieces of received data obtained from the decoding unit 103, and generates the most matched data as the received collated data. The received collation data is checked for day of the week collation and non-existent collation. If the day of week data matches and there is no non-existent data, the process proceeds to step S405.

  In step S405, when the time digit of the reception verification data is not changed or changed (step S405: NO), the process proceeds to step S404, and the reception verification data is stored in the reception data storage unit A104 of the data storage unit 110. In step S403, reception verification data including the latest reception data is generated.

If the time digit of the received collation data is increased or changed in step S405 (step S405: YES), the process proceeds to step S406, where the received collation data is stored in the received data storage unit B114 of the data storage unit 110, and step S407 is performed. Migrate to

  Next, in step S407, the received data stored in the received data storage unit A104 and the received data storage unit B114 of the data storage unit 110 are collated, and the process proceeds to step S408.

The collation method for collation of received and stored data in step S407 will be described with reference to FIG.
FIG. 5a shows a case where arbitrary reception is performed in a state where a miscode in which one code is mistaken for 0 code occurs in D1 bit of one hour, and FIG. 5b shows a case where arbitrary reception is performed in a state where no miscode occurs. The relationship between time and received storage data is shown.

Arbitrary reception is performed as shown in FIG. 5a, and the reception data storage means A104 becomes 21:59 when the transmission time is 23:59 due to a miscode generated in D1 bit of one hour.
Next, when the carry digit of the reception verification data is changed or changed (step S405: YES), the D1 bit code of the hour 1 digit is 0, so that the reception data storage means B114 has a transmission time of 0:10. At 0:10, the same as the transmission time.
However, when the received data storage means A104 adds the elapsed time difference, it becomes 22:10 when the transmission time is 0:10.

As described above, when the transmission time is 0:10, the reception data A104 is 22:10 and the reception data B114 is 0:10, and the reception is determined to be unsuccessful because the time does not match. .
As shown in FIG. 5b, when no miscode occurs, both the received data storage means A104 and the received data storage means B114 added with the elapsed time difference when the transmission time is 0:10 are 0:10, which is the same as the transmission time. Reception is successful.

Further, the relationship between the transmission time and the storage process of the reception data A104 and reception data B114 will be described with reference to FIG.
Although reception processing is performed in step S402, since second synchronization detection, minute synchronization detection, and the like are performed, reception processing is required for about 2 minutes from the start of reception.

  Thereafter, the process proceeds to step S403, the reception collation data is generated, the day collation and non-existence collation are finished, the process proceeds to step S404, and data accumulation is started in the reception data storage means A104, and the transmission time is 0:00. Then, the process proceeds to step S406, where data accumulation is started in the reception data storage means B114, the accumulation ends at 0:05, and reception storage data collation is performed from 0:06.

After the above-described received storage data collation is completed and the process proceeds to step S408, if the reception is successful in step S407 (step S408: YES), the process proceeds to step S409, and the time measurement unit 112 corrects the time measurement time. The process proceeds to step S411, and the receiving operation is terminated.
If reception has failed in step S407 (step S408: NO), the process proceeds to step S410, a reception failure display is performed on the display means 113, the process proceeds to step S411, and the reception operation is terminated.

In step S403, the day of the week collation and the non-existent collation are confirmed, and if the day of week data does not match or the non-existent data exists, the process proceeds to step S410 to perform reception failure processing.
If no carry occurs for a certain time in step S405, the process proceeds to step S410, and reception failure processing is performed.

  Also, when the conditions are such that the reception status of the standard time information signal is good and no miscode is generated (for example, when the electric field strength is large and the occurrence of noise is small), the process proceeds from step S403 to step S403. Instead of proceeding to S404, the process proceeds to step S409, and the reception success process is performed, whereby the reception time can be reduced and the reception current consumption can be reduced.

  As described above, by collating different time digit data in one reception, the occurrence rate of erroneous reception of time digit data can be greatly reduced, and the reception current consumption can also be reduced.

The arbitrary reception time storage unit 109 can be changed by the external input unit 111, and the arbitrary reception time can be set in units of one minute.
Further, when there are a plurality of arbitrary reception time storage means 109, the setting of at least one arbitrary setting time cannot be set to 00 minutes at which it takes the longest time to carry the hour digit and the effect of the present invention cannot be exerted. By doing so, reception with high detection accuracy of erroneous reception is possible in accordance with the user's intention.
Further, by setting the minute digits of the initial setting value of the arbitrary reception time storage unit 109 of the present invention to a setting (for example, 55 minutes) other than 00 minutes at which the effect of the present invention cannot be exhibited, the user can set the arbitrary reception time storage unit 109. The effect of the present invention can be exhibited without setting.

(Third embodiment)
Next, the contents of the process of the time adjustment method according to the third embodiment of the present invention will be described with reference to the drawings.
The third embodiment is an example in which the present invention is applied to forced reception.
In the third embodiment, FIG. 6 is a flowchart showing the processing procedure of the time adjustment method according to the third embodiment of the present invention, and FIG. 7 shows the transmission time of the standard time information signal and the received data storage in the third embodiment. 13 shows the relationship between the means A104 and the reception data storage means B114. FIG. 13 shows the relationship between the transmission time and the storage processing of the reception data storage means A104 and the reception data storage means B114 in the third embodiment. Explain when it starts.

  In FIG. 6, when a forced reception instruction is received from the user by the external input unit 111, the process proceeds to step S602 as a preparation for reception (step S601: YES), the reception command 115 is output from the control unit 102, and the reception operation is started. The receiving means 101 receives the standard radio wave including the standard time information signal, detects the second synchronization from the received standard radio wave, detects the minute synchronization by the decoding means 103, and obtains the received data.

  Next, in step S603, the collation unit 105 obtains a plurality of received data obtained from the decoding unit 103, generates the most matched data as reception collation data, and performs day-of-week collation and non-existent collation for the received collation data. If the day data match and there is no nonexistent data, the process proceeds to step S604, the reception verification data is stored in the reception data A104 of the data storage unit 110, and the process proceeds to step S605.

  In step S605, when the time digit of the received collation data has changed or changed (step S605: YES), the process proceeds to step S406 in FIG. 4, and thereafter the received stored data is collated in the same manner as in the second embodiment. To process reception success and failure.

In step S605, when the time digit of the reception collation data has increased or has not changed (step S605: NO), the process proceeds to step S606, the reception flag is set to 1, the process proceeds to step S607, and the reception operation is stopped. The process proceeds to step S608.

In step S608, when the time measuring means 112 has reached the hour (step S608: YES), the process proceeds to step S609.
In step S609, if the reception flag is not 1 (for example, if received memory data collation is performed in step S605: YES, if received memory data collation is performed after step S611), the process proceeds to step S610 to perform the receiving operation. Not performed. (finish.)

  If the reception flag is 1 in S609 (for example, if the received stored data collation cannot be performed in step S605: NO), the process proceeds to step S611, the reception flag is set to 0, and the process proceeds to step S612.

  In step S612, the reception command 115 is output from the control means 102 as reception preparation, the reception operation is started, the reception means 101 receives the standard radio wave including the standard time information signal, and performs the second synchronization detection from the received standard radio wave. The minute synchronization is detected by the decoding means 103 so that the received data can be acquired.

  Next, in step S613, the collation unit 105 obtains a plurality of reception data obtained from the decoding unit 103, generates the most matched data as reception collation data, and performs day of week collation and non-existence collation for the reception collation data. If the day data matches and there is no non-existent data, the process proceeds to step S614, the received collation data is stored in the received data storage means B114 of the data storage means 110, and the process proceeds to step S615.

Next, in step S615, the received data storage unit A104 and the received data storage unit B114 of the data storage unit 110 are collated, and the process proceeds to step S616.
A collation method for collation of received and stored data in step S615 will be described with reference to FIG.
FIG. 7a shows a case where forced reception is performed in a state where a miscode in which 0 code is mistaken for 1 code occurs in D2 bit of one hour, and FIG. 7b shows a case where forced reception is performed in a state where no miscode occurs. The relationship between time and received storage data is shown.

Forcible reception is performed as shown in FIG. 7a, and the reception data storage means A104 becomes 17:40 when the transmission time is 13:40 due to a miscode generated in D2 bit of one hour.
Next, when the time measured by the time measuring means 112 is increased or changed (step S608: YES), the D2 bit code of 1 hour is 1, so that the reception data storage means B114 has a transmission time of 14:05. At 14:05, which is the same as the transmission time, the received data storage means A104 becomes 18:05 when the elapsed time difference is added.

As described above, when the transmission time is 14:05, the reception data storage means A104 is 18:05 and the reception data B114 is 14:05, and the reception is unsuccessful because the time does not match.
If no miscode occurs as shown in FIG. 5b, the reception data A104 and the reception data B114 obtained by adding the elapsed time difference when the transmission time is 14:05 are both 14:05, which is the same as the transmission time, indicating that the reception is successful. Become.

Further, the relationship between the transmission time and the storage process of the reception data A104 and reception data B114 will be described with reference to FIG.
Although the reception process is performed in step S602, since the second synchronization detection and the minute synchronization detection are performed, the reception process is required for about 2 minutes from the start of reception.

Thereafter, the process proceeds to step S603, the reception collation data is generated, the day of the week collation and the nonexistent collation are finished, the process proceeds to step S204, and data accumulation is started in the reception data storage means A104, which is received at 1:10 on a regular basis. Exit.
Next, when the time of the time measuring means 112 reaches the normal time, reception is started again at step S612, and reception processing is performed at step S612. Processing is required.

After that, the process proceeds to step S613, the reception collation data is generated, the day of the week collation and the nonexistent collation are finished, the process proceeds to step S614, and data accumulation is started in the reception data storage means B114, and accumulation is performed at 14:05. The process ends, and the received storage data collation is performed from 14:06.

After the above collation of the received storage data collation is completed and the process proceeds to step S616, if the reception is successful in step S615 (step S616: YES), the process proceeds to S617, and the time measuring unit 112 corrects the time measured. Then, the process proceeds to step S619 to end the reception operation.
If reception has failed in step S615 (step S616: NO), the process proceeds to step S618, a reception failure display is performed on the display unit 113, the process proceeds to step S619, and the reception operation is terminated.

  In step S603 and step S613, the day of the week collation and the nonexistent collation are confirmed, and if the day of the week data does not match or the nonexistent data exists, the process proceeds to step S618 to perform reception failure processing.

  Further, in step S603, when the reception condition of the standard time information signal is good and it is assumed that no miscode occurs (for example, when the electric field strength is large and the occurrence of noise is small), step S603 is performed. From step S604, the process proceeds to step S617, and the reception success process is performed, whereby the reception time can be reduced and the reception current consumption can be reduced.

  As described above, according to the third embodiment, even in reception where the reception start time is not fixed such as forced reception, the occurrence rate of erroneous reception of time digit data is significantly reduced by collating different time digit data. In addition, the reception current consumption can be reduced because reception is performed only in a necessary time zone.

In step S608, when the timekeeping means reaches the hour, the process proceeds to step S610 to perform reception again. However, the present invention is not limited to the above embodiment. For example, the following modifications are possible.
(1) After stopping the reception in step S607, one hour or more may elapse, and then the process may move to step S609 to perform reception again.
(2) After stopping the reception in step S607, the time from the minute digit data stored in the reception data A104 to 00 minutes is calculated, and after the time digit data of the transmission time has changed reliably, the process proceeds to step S609. You may receive again.
(3) If the minute digits of the timekeeping time of the timekeeping means 112 at the start of forced reception or the minute digits of the acquired reception verification data are within a predetermined range (for example, 40 minutes to 00 minutes), the timekeeping time of the timekeeping means 112 The reception time may be extended until the time digit or the time digit of the received reception verification data is increased or changed.
However, the extension of the reception time may increase the reception time depending on the user, and the user may feel uncomfortable. Therefore, by selecting whether or not the reception time can be extended by the external input means 111, the user's intention can be adjusted. Can be received.
(4) In the third embodiment, in step S608, the reception is started again when the timekeeping means reaches the hour. However, since the reception starts at a timing unintended by the user, the reception is performed again. Alternatively, reception failure processing may be performed.

As described above, the present invention has been described using the first embodiment, the second embodiment, and the third embodiment. However, the reception in the first embodiment uses the fixed reception time storage unit 108, and the reception in the second embodiment is optional. Although the description has been made using the reception time storage unit 109, the present invention is not limited to this combination.
For example, the following modifications are possible.

(1) In Example 2, the reception start time was set to 23:55 for arbitrary reception, but the fixed reception time of the fixed reception storage means was set to 23:55, 1:55, and 3:55. However, the same processing may be performed across 0:00, 2:00, and 4:00.
In addition, in the received and stored data collation of the second embodiment, collation was performed using two time digit data obtained by one reception. In the above case, the obtained time digit data is 23:00, 0 o'clock, Since there are six times of 1 o'clock, 2 o'clock, 3 o'clock, and 4 o'clock, the time digit data that most closely matches may be adopted by adding the respective elapsed time differences to these six data.
(2) Although the third embodiment shows the case of forced reception, this content can also be used when the reception start time such as arbitrary reception can be arbitrarily changed by the user.

  Further, as in the first and third embodiments, the reception data storage means A104 is stored and the reception data storage means B114 is not stored. Is the previous time data (before the reception data A104 is acquired), so there is a possibility of misunderstanding for the user, and the received data storage is not displayed but the state when the reception data storage means A104 is acquired is displayed. It is desirable to display the reception result before acquiring the means A104, and more preferably, the received data storage means A104 is stored in addition to the reception level display at the time of successful reception, failure, and successful reception, and the received data B114 is not stored. May be provided and displayed.

(Relationship between reception start time and time accuracy)
Next, the relationship between the reception start time and the collation accuracy will be described.
As described in the first, second, and third embodiments, it is possible to improve the accuracy of detecting erroneous reception by acquiring and comparing different time digit data, but the detection accuracy of erroneous reception can be improved by the difference in reception start time. Different.

  The reception time is best at midnight due to the ionosphere, and it is most easy to receive from 0:00 to 4 o'clock, so in this description, the hour of 1 o'clock, 2 o'clock, 3 o'clock, 4 o'clock The case of straddling will be described with reference to FIG. 8, and then the case of straddling 0:00 at 0 o'clock with the highest detection accuracy of erroneous reception will be described.

FIG. 8 is a diagram illustrating a difference in detection accuracy between reception time and erroneous reception.
FIG. 8a shows a reception with no miscode across 1:00, FIG. 8b shows a reception without a miscode across 2:00, and FIG. 8d is received when there is no miscode across 4:00.
FIG. 8e shows that when a miscode is received in which the 0 code is mistaken for 1 code in D1 of 1 hour across 1:00, FIG. 8f is in D1 of 1 hour across 2:00. When a miscode is received in which one code is mistaken for 0 code, FIG. 8g is a diagram when a miscode is received in which one code is mistaken for 0 code in D1 of one hour across 3:00. 8h is a bit that fluctuates depending on the transmission time and the carry of the hour digit when receiving a miscode that has been mistaken for 0 code to 1 code at D0 of 10 hours across 4:00 and received data A104 and reception The relationship of the data B 114 is shown, and the shaded portion in the figure shows a fluctuating bit.

  As shown in FIG. 8a and FIG. 8c, when reception is performed across 00 minutes of 1 o'clock and 3 o'clock odd hours, the bit of the fluctuating time digit data is only D0 bit of 1 hour, as shown in FIG. 8e. If a miscode occurs in a bit that does not fluctuate (for example, if D1 in the hour digit is mistaken from 0 code to 1 code), the received data A104 obtained by adding the elapsed time difference when the transmission time is 2 o'clock is 3 o'clock Since reception data B114 is 3 o'clock, it is not possible to detect erroneous reception in this case.

  In the above, the occurrence of a miscode was D1 bit of 1 hour, but the same applies to D2, D3 of 1 hour, D0, D1 of 10 hour, and the error of miscode that occurred other than D0 of 1 hour. Since reception cannot be detected, the number of bits in which a miss code cannot be detected is 5 bits.

On the other hand, when it is received over 4:00 as shown in FIG. 8d, the bit of the fluctuating hour digit data has the most fluctuating bit number between 1 o'clock and 4 o'clock with D0, D1, and D2 bits of 1 hour, If a miscode occurs in D3 with an hour code of 0 and mistakenly with a 1 code, the 1-digit data at the transmission time of 3 o'clock becomes B (hex), so that erroneous reception can be detected, and the 10-digit hourly D1 If a miscode occurs in which the 0 code is mistaken for the 1 code, the time data at 4 o'clock of the transmission time is 24 o'clock, so that erroneous reception can be detected.
However, as shown in FIG. 8h, when a miscode occurs in which D0 is mistaken for 0 code in D0 of 10 hours, the time data at 3 o'clock transmission time is 13:00 and the time data at 4 o'clock transmission time is 14:00. Since erroneous reception cannot be detected, the number of bits that cannot be detected is 1 bit.

That is, according to the present invention, the detection accuracy of erroneous reception can be improved as there are more bits (different bits) of the time digit data that fluctuate in two time digit data obtained when receiving over 00 minutes.
For this reason, as shown in FIG. 8a and FIG. 8c, since the reception across the 00 minutes of the odd hour of 1 o'clock and 3 o'clock always fluctuates only by one digit D0, the effect of the present invention cannot be fully exhibited. It is desirable that the time setting for the regular reception is reception over 00 minutes at the even time (reception that first performs reception at the odd time).

Next, reception across 0:00 (from 23:00 to 0:00) with the highest detection accuracy of erroneous reception will be described with reference to FIG.
FIG. 9 shows the relationship between the transmission code, the reception data A104, and the reception data B114 when a miscode occurs in each bit of the hour digit data when reception over 0:00 (from 23:00 to 0:00) is performed. FIG.

  As shown in FIG. 9a, when a miscode that misreads the 0 code as 1 occurs in the hour digit data, the 0 code is output with the time data at 23:00, D0 for the hour 10 digits, D2 for the hour 1 digit, D3. If any one of the miscodes that misreads 0 code as 1 occurs, the non-existing time is reached, so that erroneous reception can be detected.

  Also, as shown in FIG. 9b, when a miscode that misreads 1 code as 0 occurs in the hour digit data, the 1 code is output with the time data at 23:00 D1 of 10 hours, D0 of 1 hour digit, If there is a miscode that causes one code to be misread as 0 at D1, the time data at 23:00 will be 22:00 or less, so it will not match the data acquired at midnight, so erroneous reception can be detected .

  Further, as shown in FIG. 5, since the data of the integration date fluctuates when fluctuating from 23:59 to 0:00, it can be estimated that the hour digit data is 0:00 (or 23:00). The matching accuracy can be further increased if the fact that the fluctuations in the accumulated date data match is also included in the matching factor.

  As described above, when the reception time is between 0 o'clock and 4 o'clock, when reception is performed over 00 minutes at 0 o'clock, when reception is performed over 00 minutes at 4 o'clock, the next time is over 2:00 The detection accuracy of erroneous reception increases in the order of reception.

For this reason, when the scheduled reception is performed at a time other than 0:00, the hour digit data is not collated, the reception is performed until the second synchronization detection and the minute synchronization detection, the reception time is shortened, and the reception current consumption is reduced. And even better.

The above is the content related to the case of only the time digit of the received data, but the same applies to the verification of the integration date, and the different integration data is compared by receiving across 0:00, and the date data is related. The detection accuracy of erroneous reception can also be increased.
For this reason, all reception codes are received only when starting reception from a date on which fluctuation bits such as 9, 7, 3, etc. are likely to have large fluctuation bits. The reception time may be shortened by performing reception until the minute synchronization is detected, and the reception current consumption may be reduced.

  As described above, according to the present embodiment, since at least two or more time digit data can be acquired, even if there is an error in data received due to noise or the like, the error is extracted and the current location time is extracted. It can be made not to be subject to correction. Therefore, it is possible to correct the time more accurately.

  In the above embodiment, the radio wave correction clock has been described. However, the radio wave correction clock includes all kinds of clocks such as a wristwatch, a wall clock, and a table clock. In addition, the present invention is not limited to a radio wave correction watch, but a camera, a digital camera, a digital video camera, a game device, a mobile phone, a PDA (Personal Digital Assistant), a notebook personal computer incorporating the radio wave correction watch. It may be a portable information terminal device such as a home appliance or an electronic device including a car.

  As described above, the radio-controlled timepiece, electronic device, and time correction method according to the present invention receive a standard radio wave including a standard time information signal, and correct the time based on the standard time information signal applied to the received standard radio wave. Suitable for use in watches and electronic devices.

It is explanatory drawing which shows the functional structure of the radio-controlled timepiece concerning this Embodiment of this invention. It is a flowchart which shows the procedure of the process of the time correction method concerning the form of this Example 1 of this invention. It is a figure which shows the relationship of the transmission time of the standard time information signal in Example 1, and the reception data storage means A104 and the reception data storage means B114. It is a flowchart which shows the procedure of the process of the time correction method concerning the form of this Example 2 of this invention. It is a figure which shows the transmission time of the standard time information signal in Example 2, and the relationship of received data storage means A104 and received data storage means B114. It is a flowchart which shows the procedure of the process of the time correction method concerning the form of this Example 3 of this invention. It is a figure which shows the transmission time of the standard time information signal in Example 3, and the relationship between reception data storage means A104 and reception data storage means B114. It is a figure which shows the difference in the detection precision of a reception time and an erroneous reception. It is the figure which showed the relationship between the transmission code and the reception data storage means A and B at the time of performing reception over 0:00. It is explanatory drawing which shows the content of the format of the transmission data of a standard radio wave. It is a figure which shows the relationship between the transmission time in Example 1, and the accumulation | storage process of the reception data storage means A104 and the reception data storage means B114. It is a figure which shows the relationship between the transmission time in Example 2, and the accumulation | storage process of the reception data storage means A104 and the reception data storage means B114. It is a figure which shows the relationship between the transmission time in Example 3, and the accumulation | storage process of reception data storage means A104 and reception data storage means B114.

Explanation of symbols

100 radio wave clock 101 receiving means 102 control means 103 decoding means 104 received data A
105 collation means 106 time collation means 107 fixed reception time storage means 108 fixed reception time storage means 109 arbitrary reception time storage means 110 data storage means 111 external input means 112 timing means 113 display means 114 received data B
115 Receive command 116 Receive code

Claims (15)

Reception means for receiving a radio signal having time data, reception data verification means for generating reception verification data from a reception code output from the reception means, and reception data storage for storing reception verification data generated by the reception data verification means The reception data in a radio-controlled timepiece having a control means for controlling the reception means, the reception data collating means, and a time measuring means for measuring time based on the reception time data generated by the reception data collating means The radio wave correction timepiece characterized in that the collating means collates the received data using the received collating data having a time digit different from that of the received data, and generates reception time data. When the reception status is not in a predetermined condition, the reception data storage means stores at least the time digit data of the reception data acquired from the reception means, and ends the reception operation.
At the timing when the time digits are estimated to be different, receive again,
The radio-controlled timepiece according to claim 1, wherein received data is collated including received data stored in the received data storage means. 3. The radio-controlled timepiece according to claim 1, wherein the reception time data whose minute digit data is before 59 minutes and after 00 minutes is acquired. When the minute digit of the reception start time is within a predetermined time range, the reception time is extended for a predetermined time so that the reception data with the minute digit after 00 minutes can be obtained,
The radio-controlled timepiece according to claim 3, wherein the reception time is not extended when the minute digit of the reception start time is out of a predetermined time range. If the minute digits of the received data obtained by the received data collating means are within a predetermined time range,
Extend the reception time for a predetermined time so that the reception data with the minute digit after 00 minutes can be obtained,
The radio-controlled timepiece according to claim 3, wherein the reception time is not extended when the minute digit of the reception data is outside a predetermined time range. 6. The radio-controlled timepiece according to claim 4, wherein the reception time is extended for the predetermined time that is extended when the reception condition is in a predetermined condition and when the reception condition is not in the predetermined condition. Memorize the scheduled reception time that automatically starts receiving time data,
A regular reception time storage means for outputting the reception time to the control means;
7. The radio-controlled timepiece according to claim 1, wherein the scheduled reception time stored in the scheduled reception storage means is a timing at which the minute digit is not 00 minutes. The radio-controlled timepiece according to claim 7, wherein the reception data collating means first generates reception time data when the minute digit of the time measuring means is between 30 minutes and 59 minutes. The radio-controlled timepiece according to claim 8, wherein the scheduled reception time stored in the scheduled reception storage unit is received across 00 minutes of the time having an even hour digit. Of the scheduled reception times stored in the scheduled reception storage means,
The radio-controlled timepiece according to any one of claims 7 to 9, wherein at least one of the reception operations is received across a time of 0:00. 11. The radio wave according to claim 7, wherein when receiving operation is performed according to the scheduled reception time stored in the scheduled reception storage unit, the reception time varies depending on the date data of the timing unit. Correction clock. Having external input means coupled to the external operating member;
The scheduled reception time storage means includes arbitrary reception time storage means for storing an arbitrary reception time at which a user can arbitrarily set a scheduled reception time for automatically receiving time data,
12. The radio-controlled timepiece according to claim 7, wherein the arbitrarily set time can be set up to a minute digit. The arbitrary reception time storage means can set a plurality of arbitrary reception times,
The radio-controlled timepiece according to claim 12, wherein at least one of a plurality of settable arbitrary reception times cannot be set to 00 minutes. 14. The radio-controlled timepiece according to claim 12, wherein among the plurality of arbitrary reception times that can be set, at least one of the minute digits has an initial setting value other than 00 minutes. . 15. The radio-controlled timepiece according to claim 3, wherein execution / non-execution of extension of reception time in the previous period can be selected.

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