JP4196860B2 - Time data receiving apparatus and program - Google Patents

Description

  The present invention relates to a time data receiving apparatus, and is suitable for application to, for example, an arm-mounted radio timepiece.

  Currently, in Japan (Japan), time data, that is, 40 kHz and 60 kHz standard radio waves including time codes are transmitted from two transmitting stations (Fukushima Prefecture and Saga Prefecture). In recent years, so-called radio timepieces have been put to practical use that receive such standard time-code radio waves and thereby correct time data of the time counting circuit. A radio timepiece corrects the current time by receiving a standard radio wave via a built-in antenna, amplifying and modulating the time code, and decoding the time code.

By the way, this type of radio timepiece is usually installed indoors, but it is installed in places where it is difficult to receive standard radio waves, such as the central part of a steel frame house, where standard radio waves cannot be received. There may be a case where an unstable situation continues for a long period of time. In this case, since the radio timepiece has not received the standard radio wave for a long period of time, it is natural that the display time of the radio timepiece includes a considerable error. However, if no information is provided about whether or not the time has been properly adjusted, the user should trust the time displayed on the radio clock, even if the time is actually correct. I can't judge whether it's good, and this is as if I can't trust it.
Therefore, as a technology that allows the user to recognize whether the time adjustment has been performed properly and for how long it has not been performed, time correction by receiving standard radio waves is appropriate. There has been proposed a radio timepiece that displays the number of days that have elapsed since execution became impossible (see, for example, Patent Document 1). In addition, a radio timepiece that stops carrying the second hand while the time adjustment operation is not properly performed has been proposed (for example, see Patent Document 2).
Japanese Unexamined Patent Publication No. 57-19689 JP 2002-107467 A

However, in the radio timepiece having such a configuration, only the fact that the time correction is delayed or the elapsed time in the state where the time correction is delayed is displayed, and the determination of how accurate the display time is (reliability). There is a problem that there is little information that contributes to the problem, and it is difficult for the user to grasp the degree of reliability of the display time.
The present invention has been made in consideration of the above points, and an object of the present invention is to realize a time data receiving apparatus in which a user can more intuitively grasp the reliability of display time.

In order to solve such a problem, in the time data receiving device according to claim 1 (for example, the radio timepiece 1 in FIG. 1), time counting means (for example, the time measuring circuit unit 23 in FIG. 2) for counting current time information,
Receiving means for receiving radio waves including time data (for example, the receiving circuit unit 24 in FIG. 2);
Time correction means (for example, the CPU 20 in FIG. 2; steps S14 to S18 in FIG. 3, steps S14 to S18 in FIG. 8) corrects the current time information counted by the time counting means based on the time data included in the radio waves received by the reception means. Steps S44 to S48)
Time display means (for example, the time display unit 131 in FIG. 1) for displaying the current time information counted by the time counting means in a plurality of digits;
Error calculation means (for example, CPU 20 in FIG. 2; step S32 in FIG. 4, step S72 in FIG. 9) for calculating an error that occurs after the previous time correction based on the counting accuracy of the time counting means;
In accordance with the error, display control means (for example, CPU 20 in FIG. 2; FIG. 4) that clearly indicates the display of digits that may be inaccurate among a plurality of digits displayed on the time display means. Step S38, Step S78 in FIG. 9),
It is characterized by having.

Further, in the program according to claim 4 (for example, the first time correction processing program 211 in FIG. 2 and the second time correction processing program 211b in FIG. 6),
A receiving unit (for example, the receiving circuit unit 24 in FIG. 2) that receives radio waves including time data, and a time display unit (for example, the time display unit 131 in FIG. 1) that displays current time information in a plurality of digits are provided. On the computer,
A time counting function for counting current time information;
A time correction function for correcting the current time information counted by the time counting function based on the time data included in the radio wave received by the receiving means (for example, steps S14 to S18 in FIG. 3, step S44 in FIG. 8). S48)
An error calculation function (for example, step S32 in FIG. 4, step S72 in FIG. 9) for calculating an error that occurs after the previous time correction based on the counting accuracy of the time counting function;
In accordance with the error, a display control function (for example, step S38 in FIG. 4 and FIG. 9) that clearly indicates the display of digits that may be inaccurate among a plurality of digits displayed on the time display means. Step S78),
It was made to realize.

  Therefore, according to the time data receiving apparatus according to claim 1 and the program according to claim 4, the error generated after the previous time correction is calculated based on the counting accuracy of the time counting means, and the time display means By clearly controlling the display of digits that may be inaccurate among the multiple digits displayed on the screen by special control, the user can grasp the reliability of the display time from the display time itself, etc. The reliability of the display time can be grasped more intuitively.

The time data receiving device according to claim 2 is the time data receiving device according to claim 1,
The error calculation means is a monthly difference reference error calculation means (for example, for calculating an error based on a monthly difference accuracy of the time counting means and an elapsed time from the previous time correction by the time correction means to the present) The CPU 20 of FIG. 2; step S32) of FIG. 4 is provided.

  Therefore, according to the time data receiving apparatus of the second aspect, the error is calculated based on the monthly difference accuracy of the time counting means and the elapsed time from the previous time correction by the time correcting means to the present time. By doing so, not only the user can more intuitively grasp the reliability of the display time, but also the error amount included in the current time measurement can be calculated efficiently and sufficiently accurately with a simple configuration.

The time data receiving device according to claim 3 is the time data receiving device according to claim 1,
The error calculation means calculates an error based on an elapsed period from the previous time correction to the previous time correction by the time adjustment means and the previous time correction amount, and an elapsed period from the previous time correction to the present. It is characterized by having correction amount reference error calculation means (for example, CPU 20 in FIG. 2; step S72 in FIG. 9).

  Therefore, according to the time data receiving device of the third aspect, the elapsed period from the previous time correction to the previous time correction by the time correction means and the previous time correction amount, and the time from the previous time correction to the present time By calculating the error based on the elapsed period, not only can the user more intuitively understand the reliability of the display time, but also the error amount included in the current time measurement can be defined in claim 2. It can be calculated even more accurately compared to the time data receiver described.

  According to the present invention, an error occurring after the previous time correction is calculated based on the counting accuracy of the time counting means, and the display of the possibly incorrect digits among the plurality of digits displayed on the time display means is performed. By making explicit by performing the special control, it is possible to realize a time data receiving device that allows the user to more intuitively grasp the reliability of the display time.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In the following, a case where the present invention is applied to an arm-mounted radio timepiece will be described, but the form to which the present invention can be applied is not limited thereto.

[First Embodiment]
FIG. 1 is a schematic plan view of an arm-mounted radio timepiece 1 according to the present embodiment.

  The radio-controlled timepiece 1 includes a receiving antenna 11 for receiving a standard radio wave related to time correction, a case 12 as a case body containing the receiving antenna 11 and a clock module, a display unit 13 for displaying time, and the like. Since the radio timepiece 1 is worn on the wrist, the case 12 has the 12 o'clock direction and the 6 o'clock direction (the radio timepiece 1 in the present embodiment is not an analog timepiece, but for the sake of simplicity, it will be referred to as the 12 o'clock direction and the 6 o'clock direction). .)) Is provided with a band 15 attached to each end part via a band attaching part 14 and a switch part 16 composed of a plurality of push-down switches, and a user wearing this on one arm Various functions can be used by depressing the switch unit 16 with the hand of another arm.

The display unit 13 of the radio timepiece 1 includes a time display unit 131 that digitally displays the current time measured by the radio timepiece 1 in units of seconds in 24-hour notation, and a time display of the radio timepiece 1 (display time in the time display unit 131). The indicator 132 is configured to include an indicator 132 that graphically displays a measure of how accurate (hereinafter referred to as reliability).
This time display unit 131 displays a time of 1 second, 10 seconds, 1 minute,... Of the time on a 7-segment type liquid crystal, respectively, a second display digit (lower) 1311, a second display digit (upper) 1312, Minute display digits (lower) 1313 are provided.
The indicator 132 is composed of a plurality of liquid crystal cells, and displays an indication of the reliability of the timekeeping of the radio timepiece 1 by the number of lit liquid crystal cells. For example, in the case of the present embodiment, the indicator 132 is composed of 10 liquid crystal cells, and the display control is performed so that one liquid crystal cell is turned off every time the time adjustment fails for 3 days. The number of lit liquid crystal cells in the indicator 132 can be used as a measure of reliability.

  FIG. 2 is a block diagram showing the internal configuration of the radio-controlled timepiece 1 according to this embodiment. A CPU (Central Processing Unit) 20 as a control unit (computer) has a ROM (Read Only Memory) 21 and a RAM (Random Access Memory). 22, a time measuring circuit unit 23, a receiving circuit unit 24, a switch unit 16, and a display unit 13 are connected.

  The CPU 20 reads out various programs stored in the ROM 21 in accordance with predetermined timing or an operation signal input from the switch unit 16 and develops them in the RAM 22, and gives instructions and data to each functional unit based on the programs. For example.

  The ROM 21 is an area for storing various initial setting values and initial programs, as well as programs and data for realizing each function of the radio timepiece 1, and as a program for realizing the present embodiment in particular. A first time correction processing program 211 and a first display processing program 212 are stored.

  The time measuring circuit unit 23 includes an oscillation circuit 231, a frequency dividing circuit 232, and a clock count circuit 233, and is a circuit group that performs time counting, which is a main function as a clock. In the present embodiment, all the timekeeping in the radio-controlled timepiece 1 is performed by the timepiece circuit unit 23, and the reliability and error amount of timekeeping are the reliability and error amount of timekeeping itself by the timepiece circuit unit 23. Shall be pointed to.

  The oscillation circuit 231 is configured by, for example, a crystal oscillator, and is a circuit that outputs a clock signal having a constant frequency to the frequency dividing circuit 232 at all times. The frequency dividing circuit 232 counts the clock signal input from the oscillation circuit 231 and outputs a 1-minute signal to the clock count circuit 233 every time the count value becomes a value corresponding to 1 minute. The clock count circuit 233 is a circuit that counts current time data such as the date of the day and the current hour / minute / second based on the 1-minute signal input from the frequency divider 232. As a result, the timing circuit unit 23 can measure the date / time of the current year / month / day / hour / minute / second and output the date / time data to the CPU 20. Based on this date / time data, the CPU 20 controls the display unit 13 to display the current time on the time display unit 131. Further, as will be described later as the time correction process, the CPU 20 appropriately corrects the current time data counted by the clock count circuit 233 based on the standard time code.

  The receiving circuit unit 24 cuts unnecessary frequency components of the standard radio wave received by the receiving antenna 11 and extracts a corresponding frequency signal, detects the frequency signal, and performs a time such as a standard time code, an integrated date code, and a day code. Data necessary for the correction function is extracted and output to the CPU 20.

  Thus, in the radio timepiece 1, for example, at a predetermined time, the CPU 20 controls the reception circuit unit 24 to execute the standard radio wave reception process to extract data necessary for time correction, and the standard time code in the data is extracted. Based on the current time data counted by the time counting circuit unit 23, and the display time on the display unit 13 based on the current time data corrected or timed by the time measuring circuit unit 23. Various controls such as display processing to be updated are performed.

In addition to such a configuration, in the case of the radio timepiece 1 according to the present embodiment, the ROM 21 includes a monthly difference value holding unit 213 that holds a monthly difference value as the timekeeping accuracy of the radio timepiece 1. Here, the monthly difference value of the radio-controlled timepiece 1 is the correct (true) current time and time-counting circuit when operated for one month in a state in which the time is not corrected by radio wave reception (hereinafter referred to as a non-reception state). This is the magnitude (absolute value) of an error that occurs between the current time measured by the unit 23 and the magnitude of the difference that occurs between the correct current time and the current time measured by the timing circuit unit 23. The value has a meaning of guaranteeing that it is almost within the range according to a statistical basis.
For example, if the time measurement error (difference from the correct current time) that occurs in the radio timepiece 1 operated for one month in a non-receiving state is expected to fall within the range of −15 seconds to +15 seconds, the monthly difference value is “15 seconds”. It becomes. In the present embodiment, as this type of monthly difference value, a monthly difference value published by a manufacturer or a supplier as a specification of the radio timepiece 1, a so-called nominal monthly difference is adopted, and this is stored in the monthly difference value holding unit 213. It shall be held.

  In the case of the radio timepiece 1 according to the present embodiment, the RAM 22 counts and stores the non-reception state continuation days (hereinafter referred to as non-reception days), and the radio timepiece 1 measures the time. A prediction error storage unit 222 that stores an error amount estimated to be included in the current time (hereinafter referred to as a prediction error).

  In the time adjustment process (first time adjustment process) in the present embodiment, when the non-reception state is continuing, the CPU 20 sets the value of the non-reception days in the non-reception days storage unit 221 to the daily increment account ( The number of days of non-reception ← number of days of non-reception + 1). Here, in the present embodiment, the time adjustment process is performed once a day on a regular basis, and the above-described increment account is performed in the time adjustment process. Therefore, the increment account is limited to once a day. Done.

  In the display process (first display process) in the present embodiment, the CPU 20 calculates a prediction error from the value of the number of non-reception days and the monthly difference value, and stores the prediction error in the prediction error storage unit 222 described above. It is designed to store. Here, as the prediction error, for example, in the present embodiment, prediction error = monthly difference value × number of non-reception days / 30, that is, the monthly difference value is equally divided into error values per day, and the number of days of non-reception. Give as an addition. As a result, the error amount included in the current time measurement is calculated efficiently and sufficiently accurately with a simple configuration. Note that the calculation formula that gives this prediction error by the monthly difference value and the number of non-reception days can be selected as appropriate, and is not limited to the above equation.

In the first display process, the CPU 20 updates the display of the indicator 132 of the display unit 13 according to the value of the prediction error. That is, in the case of the present embodiment in which the indicator 132 is configured by 10 liquid crystal cells and one cell in the off state is configured to represent the prediction error for 3 days, the number of days of non-reception is n ( The CPU 20 controls the display of the indicator 132 so that the 10-Ceil (n / 3)) liquid crystal cells are turned on, and the liquid crystal cells are not turned on at all when the number of non-reception days is 28 or more. Here, Ceil (x) represents the minimum integer that is not less than x, in particular, when x is a positive value, the value obtained by rounding up the decimal part of x.
For example, if the time adjustment is properly performed and no reception is 0 day, the CPU 20 sets all 10 liquid crystal cells of the indicator 132, and if no reception continues for 2 days, the CPU 20 sets 9 liquid crystal cells. When the reception continues for 22 days, the display control is performed so that the two liquid crystal cells are turned on. When the non-reception continues for 28 days or more, the display control is performed so that the liquid crystal cells are not turned on at all.

  Thus, the radio timepiece 1 clearly indicates the value of the prediction error, which is the amount of error included in the timekeeping, in a graph display, which can be recognized by the user as a measure of the reliability of the display time.

  Furthermore, in the same way, in the first display process, the CPU 20 additionally performs special display control according to the prediction error, thereby expressing the specific magnitude of the error included in the timekeeping in the display time. It is made like that.

  In other words, the CPU 20 controls the display unit 13 so that the time digits constituting the time display unit 131 that are likely to be inaccurate are displayed in a display state different from the normal state, for example, a light-off state. On the other hand, only the time digits that are sufficiently reliable are displayed as usual, and the reliability of timekeeping is expressed in the display time.

  Here, the time digit that is likely to be inaccurate is the time digit in which the displayed number may be incorrect, specifically, the minimum time (for example, seconds) identified by the time digit. The display digit (lower) 1311, the second display digit (upper) 1312, and the minute display digit (lower) 1313 are 1 second, 10 seconds, and 1 minute, respectively, inferior to the prediction error, for example, the prediction error is 1.5. The second display digit (lower) 1311 in the case of the second.

  In the present embodiment, as a process for each such time digit, when the prediction error becomes larger than 1 second, the second display digit (lower) 1311 is turned off, and when the prediction error becomes larger than 10 seconds. The CPU 20 controls the display unit 13 to turn off the second display digit (upper) 1312 (in addition to the second display digit (lower) 1311). When the prediction error is larger than 1 minute and the minute display digit (lower) 1313 is clearly indicated as an inaccurate digit (the second display digit (lower) 1311 and the second display digit (upper) 1312 are turned off), the minute display digit (Lower) Since it is inconvenient if the 1313 is turned off, the CPU 20 controls the display unit 13 so that the minute display digit (lower) 1313 blinks.

  Thus, the radio-controlled timepiece 1 calculates a prediction error based on the counting accuracy of the time measuring circuit unit 23, and also displays the time correction stagnation according to the graph to indicate a measure of reliability of time measurement. The specific size (degree) is clearly included in the display time.

In practice, the CPU 20 of the radio timepiece 1 reads the first time adjustment processing program 211 and the first display processing program 212 stored in advance in the ROM 21 when the power of the radio timepiece 1 is turned on, and develops it in the RAM 22. The first time adjustment processing program 211 is executed to start the first time adjustment processing, and the first display processing program 212 is executed as necessary for the first time adjustment processing. A first display process subordinate to the first time correction process is performed. Thereafter, until the radio timepiece 1 is powered off, the processes shown in FIGS. 3 and 4 are residently executed as the first time correction process and the first display process.
This will be described in detail below.

  As shown in FIG. 3, in the first time adjustment process, first, the CPU 20 determines whether or not it is 3:00 am based on the current time data output from the timing circuit unit 23 (step S12), and 3:00 am If so (step S12: Yes), the process proceeds to step S14, and the reception of the standard radio wave (radio wave reception process) related to the time correction is started. On the other hand, if it is not 3:00 am (step S12: No), it will transfer to step S24.

  When it is 3:00 am (step S12: Yes), the CPU 20 controls the reception circuit unit 24 to start radio wave reception processing and demodulates time data (step S14).

Here, when the radio wave reception process of step S14 by the reception circuit unit 24 has failed (step S16: No), the CPU 20 increments the value of the non-reception days number in the non-reception days storage unit 221 by controlling the RAM 22. (Non-reception day number ← Non-reception day number + 1) (step S22), and the process proceeds to step S24.
On the other hand, if the radio wave reception process of step S14 by the reception circuit unit 24 has been successful (step S16: Yes), the CPU 20 counts the current time counted in the time measurement circuit unit 23 according to the time data demodulated in step S14. The data is corrected (step S18).

Next, the CPU 20 controls the RAM 22 to set the value of the non-reception days in the non-reception days storage unit 221 to 0 (step S16), and proceeds to step S24.
Thus, in the first time adjustment process, the number of days in which the non-reception state of the radio timepiece 1 continues is counted, and when the non-reception state is resolved, the number of days is reset to zero. .

  In step S24, the CPU 20 executes a switch process as a predetermined process in accordance with an input from the switch unit 16 (FIG. 1) (step S24).

Next, the CPU 20 executes a predetermined process that will be described in detail later as the first display process (FIG. 4) (step S26). When the process up to the first display process is completed, the CPU 20 returns to step S12. Steps S12 to S26 are repeated.
Note that the CPU 20 in the present embodiment repeats the switch process and the first display process in a state other than executing a series of processes (steps S14 to S22) at 3 am, and receives an input from the switch unit 16. Waiting for monitoring.

Here, the first display process during the first time correction process will be described in detail below with reference to FIG.
As shown in FIG. 4, in the first display process, the CPU 20 of the radio timepiece 1 first receives the monthly difference value from the monthly difference value holding unit 213 of the ROM 21 and the non-reception day number value from the non-reception day storage unit 221 of the RAM 22. Are calculated, and a prediction error value given by prediction error = monthly difference value × number of non-reception days ÷ 30 is calculated and stored in the prediction error storage unit 222 (step S32).

  Next, the CPU 20 controls the display unit 13 to update the display of the indicator 132 according to the value of the prediction error (step S34).

  Next, the CPU 20 controls the time measuring circuit unit 23 to obtain current time data, controls the display unit 13 using the current time data, and updates the current time displayed on the time display unit 131 (step S36).

  Next, the CPU 20 controls the display unit 13 to display the time digits constituting the time display unit 131 that are likely to be inaccurate in a display state different from normal, and clearly indicate them as inaccurate digits ( Step S38), returning to the first time correction process (FIG. 3), step S26 and subsequent steps are executed.

  As described above, in the first display process, the prediction error is calculated based on the counting accuracy of the time measuring circuit unit 23, and the reliability of the timekeeping of the radio timepiece 1 is displayed on the indicator 132 as a graph. In the time display, the time digits to be displayed that are likely to be inaccurate are clearly indicated by special control.

  In the above configuration, first, the radio timepiece 1 normally performs time correction by standard radio wave reception every day at 3 am. At this time, 0 is set as the number of non-reception days, and the value of the prediction error is 0. Therefore, in the first display process, all the liquid crystal cells of the indicator 132 are kept lit and the time display unit 131 displays the time. Keeps the normal display of all time digits (not blinking or extinguished).

Here, when the radio-controlled timepiece 1 is in a non-reception state, the account for the number of non-reception days is increased by 1 at 3 am each day in the non-reception state, and the value of the prediction error is increased. The number of lit liquid crystal cells decreases, and the time digits that are suspected to be inaccurate in the time display unit 131 shift to extinguishment or blinking display.
That is, when the non-reception state continues, the number of non-reception days increases as the non-reception state continues and 1, 2, 3,... 5 seconds, 1 second, 1.5 seconds, and so on. In the indicator 132, as the prediction error increases, the number of lit liquid crystal cells decreases. In other words, the number that was initially lit 10 is reduced to 9, 8, 7, etc. as the non-reception state continues on the 1st, 4th, 7th, ... To go. In the time display unit 131, the time digit that is suspected to be inaccurate is turned off or blinked.

  Thus, for example, when the non-reception state continues for three days, as shown in FIG. 5A, the number of liquid crystal cells that were initially lit on the indicator 132 is reduced to nine, In addition, the second display digit (lower) 1311 that has been suspected of being inaccurate because the value of the prediction error is 1.5 seconds (exceeds 1 second) first shifts to a light-off display state.

  Further, when the non-reception state continues and reaches the 21st, as shown in FIG. 5B, the number of liquid crystal cells that are lit on the indicator 132 is reduced to three, and the value of the prediction error is In addition to the second display digit (lower) 1311 that has already been turned off, the second display digit (upper) 1312 that has been newly suspected of being incorrect due to 10.5 seconds (beyond 10 seconds) Moves to the off display state.

  Further, when the non-reception state continues and reaches 121 days, as shown in FIG. 5C, all the liquid crystal cells on the indicator 132 are already turned off, and the prediction error value is 60.5. The minute display digit (lower) 1313 that is newly suspected to be inaccurate due to the second (exceeding 1 minute) is (second display digit (lower) 1311 that is already turned off and second display digit ( Top) In addition to 1312) Shift to the blinking display state.

  Such a special display state in the indicator 132 and the time display unit 131 is maintained until the time correction by the standard radio wave reception is properly performed, but is recovered when the time correction is properly performed, and the time display is performed. Each time digit of the unit 131 returns to normal display, and all the liquid crystal cells of the indicator 132 return to the lighting state.

  Thus, the user can grasp the reliability of the timekeeping of the radio timepiece 1 by the indicator 132 and the specific magnitude of the error included in the timekeeping by the special display of the time display.

Therefore, the radio timepiece 1 according to the present embodiment calculates a prediction error (representing an error occurring after the previous time correction at the time of calculation) based on the counting accuracy of the time measuring circuit unit 23, and configures the time display unit 131. The actual size of the error included in the timekeeping is indicated by clearly showing the time digits that are likely to be inaccurate as an inexact digit by changing the display state from the normal display state, for example, turning it off. Is included in the display time itself so that the user can grasp the reliability of the display time more intuitively, for example, the reliability of the display time can be grasped by the display time itself.
Further, by calculating the prediction error using the value of the non-reception days and the monthly difference value, the error amount included in the current time measurement can be calculated efficiently and sufficiently accurately with a simple configuration.

[Second Embodiment]
The radio timepiece 1 in the present embodiment has the external configuration shown in FIG. 1 and the internal configuration shown in FIG. 2 in the same manner as the radio timepiece 1 in the first embodiment. A time correction process for controlling the receiving circuit unit 24 to receive the standard radio wave and correcting the current time data counted by the timing circuit unit 23, or the corrected current time measured by the timing circuit unit 23 Various controls such as display processing for displaying time based on data are performed.
Hereinafter, a characteristic configuration of the radio timepiece 1 according to the present embodiment will be described in detail.

  In the case of the radio-controlled timepiece 1 in the present embodiment, a ROM 21b as shown in FIG. 6 is used instead of the ROM 21 in the first embodiment. Similar to the first embodiment, the ROM 21b is an area for storing various initial setting values, initial programs, and the like. In particular, the second time correction processing program 211b is a program for realizing the present embodiment. And a second display processing program 212b.

  Further, instead of the RAM 22 in the first embodiment, a RAM 22b as shown in FIG. 7 is used. The RAM 22b includes a non-reception days storage unit 221b and a prediction error storage unit 222b similar to the non-reception days storage unit 221 and the prediction error storage unit 222 in the first embodiment, as well as a previous correction amount storage unit 223b and a previous non-reception unit. A reception day storage unit 224b is further provided.

  Then, in the time adjustment process (second time adjustment process) in the present embodiment, if the time adjustment by the radio wave reception fails, the CPU 20 increments the non-reception day number in the non-reception day number storage unit 221b as in the first embodiment. However, in the present embodiment, if the time correction by radio wave reception is successful, the correction time amount at this time is set as the previous correction amount in the previous correction amount storage unit 223b, and the number of days elapsed since the previous correction is set as the previous correction amount. The number of days received is stored in the previous non-reception days storage unit 224b.

In this case, the correction time amount represents the amount of time correction applied to the timing circuit unit 23 as a difference from the correct time when the time correction by radio wave reception is successful. For example, the time correction is successful and the time correction is performed. Immediately before, the CPU 20 obtains the magnitude of the difference between the current time measured by the timing circuit unit 23 and the correct time, and stores this in the previous correction amount storage unit 223b as the previous correction amount.
The previous non-reception days is set to 1 (for the time correction success day) in the value of the non-reception days in the non-reception day storage unit 221b at the time correction success (the number of days elapsed from the previous correction time to the day before the time correction success). The CPU 20 calculates the added value and stores it in the previous non-reception days storage unit 224b.

Further, in the display processing (second display processing) in the present embodiment, the CPU 20 newly uses the previous correction amount and the previous non-reception day in addition to the number of non-reception days, so that prediction error = previous correction amount / previous time. The prediction error is calculated by the number of non-reception days × the number of non-reception days, and this prediction error is stored in the prediction error storage unit 222b of the RAM 22b.
That is, as in the first embodiment, the prediction error is calculated from the number of days not received and the error value per day. In this embodiment, the previous correction amount and the previous error are calculated as the error value per day. In other words, the error value per day based on the previous record, which is obtained from the number of reception days, is used.

  In the second display process, the CPU 20 updates the graph display of the indicator 132 of the display unit 13 and configures the time display unit 131 according to the value of the prediction error, as in the first embodiment. Of the time digits, those that have the possibility of being inaccurate are displayed in an unusual display state, for example, a light-off state or a blinking state, and are clearly indicated as inaccurate digits.

  Thus, similarly to the first embodiment, the radio-controlled timepiece 1 not only displays the time correction stagnation in the form of a graph, but also shows a measure of the reliability of timekeeping, and also displays the specific magnitude of the error included in the timekeeping. It is configured to be explicitly included in the time.

In practice, when the power of the radio timepiece 1 is turned on, the CPU 20 of the radio timepiece 1 reads the second time correction processing program 211b and the second display processing program 212b stored in advance in the ROM 21b and develops them in the RAM 22b. By executing the second time adjustment processing program 211b, the second time adjustment processing is started, and the second display processing program 212b is executed as necessary for the second time adjustment processing. A second display process subordinate to the second time correction process is performed. Thereafter, until the radio timepiece 1 is powered off, the processes shown in FIGS. 8 and 9 are residently executed as the second time correction process and the second display process.
This will be described in detail below.

  As shown in FIG. 8, in the second time adjustment process, the CPU 20 first determines whether or not it is 3:00 am based on the current time data output from the clock circuit unit 23 (step S42), and 3:00 am If so (step S42: Yes), the process proceeds to step S44 to start radio wave reception processing. On the other hand, if it is not 3:00 am (step S42: No), it will transfer to step S58.

  When it is 3:00 am (step S42: Yes), the CPU 20 controls the reception circuit unit 24 to start receiving the standard radio wave and demodulate the time data (step S44).

Here, when the radio wave reception process of step S44 by the receiving circuit unit 24 has failed (step S46: No), the CPU 20 increments the value of the number of non-reception days in the non-reception day storage unit 221b by controlling the RAM 22b. (Non-reception day number ← Non-reception day number + 1) (step S56), the process proceeds to step S58.
On the other hand, when the radio wave receiving process of step S44 by the receiving circuit unit 24 is successful (step S46: Yes), the CPU 20 counts the current time counted in the time measuring circuit unit 23 according to the time data demodulated in step S44. The data is corrected (step S48).

  Next, the CPU 20 stores the time correction amount in step S48 in the previous correction amount storage unit 223b of the RAM 22b as the previous correction amount (step S50).

  Next, the CPU 20 reads the value of the non-reception days from the non-reception days storage unit 221b of the RAM 22b, sets the value obtained by adding 1 to the non-reception days as the number of days since the previous correction, and stores it in the previous non-reception days storage unit 224b. Stored as the number of days (step S52).

Next, the CPU 20 controls the RAM 22b to set the value of the number of non-reception days in the non-reception day storage unit 221b to 0 (step S54), and proceeds to step S58.
In this way, in the second time adjustment process, the number of non-reception days of the radio timepiece 1 is counted, and when the time adjustment is successful, the time adjustment amount and the number of days since the previous correction are stored and not received. The number of days is reset to 0.

  In step S58, the CPU 20 executes a switch process as a predetermined process corresponding to an input from the switch unit 16 (FIG. 1) (step S58).

Next, the CPU 20 executes a predetermined process to be described in detail later as the second display process (FIG. 9) (step S60). When the second display process is completed, the CPU 20 returns to step S42, and thereafter Steps S42 to S60 are repeated.
Note that the CPU 20 in the present embodiment repeats the switch process and the second display process in a state other than executing a series of processes (steps S44 to S56) at 3 am, and receives an input from the switch unit 16. Waiting for monitoring.

Here, the second display process during the second time correction process will be described in detail below with reference to FIG.
As shown in FIG. 9, in the second display process, the CPU 20 of the radio timepiece 1 first receives no reception from the non-reception days storage unit 221b, the previous correction amount storage unit 223b, and the previous non-reception days storage unit 224b of the RAM 22b. The number of days, the previous correction amount, and the previous non-reception day are read, and the prediction error value is calculated by prediction error = previous correction amount / previous non-reception day number × non-reception day number, and is stored in the prediction error storage unit 222b (step S72). .

  Next, the CPU 20 controls the display unit 13 to update the display of the indicator 132 according to the value of the prediction error (step S74).

  Next, the CPU 20 controls the time measuring circuit unit 23 to obtain current time data, controls the display unit 13 using the current time data, and updates the current time displayed on the time display unit 131 (step S76).

  Next, the CPU 20 further controls the display unit 13 to display the time digits constituting the time display unit 131 that have the possibility of being inaccurate in a display state different from normal, and clearly indicate them as inaccurate digits. (Step S78), returning to the second time correction process (FIG. 8), Step S58 and subsequent steps are executed.

  As described above, in the second display process, as in the first embodiment, a measure of the reliability of the timekeeping of the radio timepiece 1 is displayed in a graph on the indicator 132, and each time digit to be displayed when displaying the time is displayed. Of these, what is likely to be inaccurate is specified by special control.

  Therefore, according to the configuration of the present embodiment, as in the first embodiment, the user can clearly indicate the specific magnitude of the error included in the timekeeping in the display time itself. The reliability of the display time can be grasped more intuitively, such as the reliability of the display time can be grasped by the display time itself.

  By the way, according to the configuration of the present embodiment, when obtaining a prediction error, it is not based on a nominal monthly difference or the like that is a statistical evaluation for a product group, but the results of the latest time correction (time correction amount and previous non-reception period) ), It is possible to estimate a more accurate prediction error according to the actual situation, such as individual differences between products of the radio timepiece 1, usage environment (peripheral equipment and temperature), battery characteristics, etc. .

  Therefore, the radio timepiece 1 in the present embodiment includes the number of non-reception days (representing the elapsed time from the previous time correction to the present at the time of calculation), the time correction amount (representing the previous time correction amount at the time of calculation), By calculating the prediction error based on the previous non-reception period (representing the elapsed period from the previous time correction to the previous time correction at the time of calculation), the error amount included in the current time measurement is Compared with the radio timepiece 1 in the first embodiment, it can be calculated more accurately.

It is a partially omitted plan view of a time data receiving device to which the present invention is applied. 2 is a block diagram showing a circuit configuration of the radio timepiece 1. FIG. It is a figure which shows the processing flow of a 1st time correction process. It is a figure which shows the processing flow of a 1st display process. It is a basic diagram which shows the example of the display in a display part. It is a figure which shows the structure of ROM in 2nd Embodiment. It is a figure which shows the structure of RAM in 2nd Embodiment. It is a figure which shows the processing flow of a 2nd time correction process. It is a figure which shows the processing flow of a 2nd display process.

Explanation of symbols

1 Radio clock 131 Time display section 1311 Second display digit (bottom)
1312 seconds display digit (top)
1313 minute display digit (bottom)
20 CPU
211 first time correction processing program 211b second time correction processing program 212 first display processing program 212b second display processing program 213 monthly difference value holding units 221 and 221b non-reception days storage units 222 and 222b prediction error storage Unit 223b Previous correction amount storage unit 224b Previous non-reception days storage unit 23 Timing circuit unit 24 Reception circuit unit

Claims (4)

Time counting means for counting current time information;
Receiving means for receiving radio waves including time data;
Time correcting means for correcting current time information counted by the time counting means based on time data included in radio waves received by the receiving means;
Time display means for displaying the current time information counted by the time counting means in a plurality of digits;
Error calculating means for calculating an error occurring after the previous time correction based on the counting accuracy of the time counting means;
In accordance with the error, display control means for clearly specifying the display of digits that may be inaccurate among the plurality of digits displayed on the time display means,
A time data receiving device comprising:   The error calculating means includes a monthly difference reference error calculating means for calculating an error based on a monthly difference accuracy of counting by the time counting means and an elapsed period from the previous time correction by the time adjusting means to the present. The time data receiver according to claim 1.   The error calculation means calculates an error based on an elapsed period from the previous time correction to the previous time correction by the time adjustment means and the previous time correction amount, and an elapsed period from the previous time correction to the present. The time data receiving apparatus according to claim 1, further comprising a correction amount reference error calculating unit. In a computer comprising a receiving means for receiving radio waves including time data and a time display means for displaying current time information in a plurality of digits,
A time counting function for counting current time information;
A time correction function for correcting current time information counted by the time counting function based on time data included in the radio wave received by the receiving means;
An error calculating function for calculating an error occurring after the previous time correction based on the counting accuracy of the time counting function;
In accordance with the error, a display control function that clearly indicates by specially controlling the display of digits that may be inaccurate among a plurality of digits displayed on the time display means,
A program to realize

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