JP2008032583A - Radio-controlled timepiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio-controlled timepiece capable of efficient time correction by improving the reception success ratio of the standard electric wave signal. <P>SOLUTION: The temperature of the periphery of an internal time piece 1 is measured by using a temperature sensor 6, frequency errors between a measured temperature of a crystal oscillator 5 and a standard temperature are calculated, and the frequency errors are accumulated over a prescribed time. In addition, how many clocks envelope detection output signals S23, contained in the standard electric wave signals are to be input into internal counters 32-34 in a prescribed time, is counted. Information necessary for time correction is received to be taken out and selected from the accumulated frequency errors and a count value so as to perform efficient time correction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a radio-controlled timepiece that receives a radio signal including a standard time signal and corrects the time, for example.

Conventionally, for example, a standard time radio signal transmitted at a frequency of 60 kHz from a standard radio broadcast station installed in Saga Prefecture, or a standard time radio signal transmitted at a frequency of 40 kHz from a standard radio broadcast station installed in Fukushima Prefecture is received. A radio-controlled timepiece that corrects the time based on the standard time radio signal is known. (For example, refer to Patent Document 1.)
Japanese Patent Laid-Open No. 2004-340749

  The radio-controlled timepiece is configured to receive a radio signal at a predetermined time, correct the time to be displayed based on time information included in the received radio signal, and always display an accurate time.

  In conventional radio-controlled timepieces, information necessary for time correction is continuously received from the radio signal and the time is corrected, so it is difficult to obtain accurate information from the radio signal if noise is mixed in part of the signal. This may interfere with the time adjustment.

  In addition, since all information such as second information, minute information, hour information is received from the radio signal at every predetermined time and the time is adjusted, even if the time is shifted only in seconds from the standard time, the second, minute, Since the time is corrected in hour units, there is a problem that it takes time to correct the time.

  The present invention has been made in view of such circumstances, and an object thereof is to reduce the influence of the noise on the time correction and to perform an efficient time correction that shortens the time required for the time correction. The purpose is to provide a radio-controlled watch.

  In order to achieve the above object, the radio-controlled timepiece according to the present invention is a radio-controlled timepiece that receives a radio signal including a standard time signal and corrects the time of the internal clock, and receives the radio signal. In the receiving means, the received radio wave signal is monitored for a predetermined time, and at least one time information necessary for the time correction is acquired at the monitoring time, the time correction of the internal clock is performed based on the acquired time information. And control means for

  In the present invention, the receiving means outputs an envelope detection signal of the radio wave signal, and the control means counts the envelope detection signal for a predetermined time, and acquires the time information according to the count value.

  In the present invention, the control means obtains count values as second information, minute information, and hour information, and each of the set count values has three counters different from each other, and any counter is set to the count value within the predetermined time. Time information for time correction is acquired depending on whether or not the time has been reached.

  The present invention provides an oscillating unit that oscillates at a predetermined frequency, a detecting unit that detects an ambient temperature of the oscillating unit, and the control unit based on information on temperature characteristics of the oscillating unit and a detection result of the detecting unit, An error between the frequency of the oscillating means and the frequency of the oscillating means at the standard temperature is detected, and the time to be corrected is corrected based on the calculated error information.

  In the present invention, the detecting means detects an error between the frequency of the oscillating means and the frequency of the oscillating means at a standard temperature based on information on the temperature characteristics of the oscillating means, and accumulates the errors for a predetermined time.

  In addition, the present invention includes at least one notification unit that notifies information that can be acquired within the predetermined time.

  According to the present invention, it is possible to reduce the influence of noise on time correction.

  Further, according to the present invention, it is possible to minimize the time required for time correction, and to perform efficient time correction.

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

FIG. 1 is a block diagram showing an embodiment of a signal processing system of a radio-controlled timepiece according to the present invention.
The radio-controlled timepiece 1 according to the present embodiment receives a standard radio signal including a standard time signal transmitted from a standard radio broadcast station, and corrects the time measured internally based on the reception result.

  The signal processing system circuit of the radio-controlled timepiece 1 according to the present embodiment includes a standard radio signal receiving system 2 as a receiving means, a control circuit 3, a gate group 4 that selects an envelope detection signal S23 according to conditions, a crystal The oscillator 5, the temperature sensor unit 6, and a notification circuit 7 that notifies the execution of time correction are provided.

The standard radio signal receiving system 2 includes a receiving antenna 21 and a receiving device 22.
The receiving antenna 21 receives a standard time signal transmitted from a standard radio broadcast station.
The receiving device 22 receives the standard time signal received from the receiving antenna and outputs an envelope detection signal S23.

FIG. 2 shows a specific example of the time signal included in the standard radio wave signal received by the radio wave correction watch shown in FIG.
FIG. 2A is a diagram illustrating a specific example of the standard radio wave signal, and FIG. 2B is a diagram illustrating a specific example of an output waveform from the receiving apparatus. FIG. 2C is a diagram showing a specific example of the output waveform when the radio wave is very weak, and FIG. 2D is a diagram showing a specific example of the output waveform when there is a lot of noise.

For example, a long standard wave JJY that conveys Japan Standard Time with high accuracy is sent in a form as shown in FIG.
Specifically, the standard time signal (also called time code) of JJY is composed of three types of signal patterns: “1” signal, “0” signal, and “P” signal, and each signal pattern is 1 second. They are distinguished by the 100% amplitude period width in (s). In the case of representing a “1” signal, a signal having a predetermined 100% amplitude period of a predetermined frequency is transmitted for 500 ms (0.5 s) in one second (s), and in the case of representing a “0” signal. In the case of 1 second, a signal having a predetermined frequency is transmitted for 800 ms (0.8 s), and in the case of representing a “P” signal, the predetermined frequency is set to 200 ms (0.2 s) for 1 second (s). The frequency is transmitted.

When the detection signal is successfully received from the standard radio broadcast station, a pulse signal corresponding to the waveform of the standard radio signal is output from the receiving device 22 as shown in FIG.
In this case, the control circuit 3 assumes that the reception state of the received standard radio wave is within a normal reference power range defined in advance.

On the other hand, when the reception state is considered to be out of the reference range, the radio wave is weak or there is a lot of noise.
When the radio wave is very weak, as shown in FIG. 2C, the pulse signal remains at a low level (L) or a high level (H) for several signals.
When there is a lot of noise, the level of the pulse signal changes regardless of the radio wave waveform, as shown in FIG.

  Japan's standard radio wave JJY is operated by the Communications Research Laboratory (CRL). The amplitude of the pulse signal PL, which is a modulated wave, is 100% at the maximum and 10% at the minimum.

Next, transmission data of the long wave standard radio wave will be described.
FIGS. 3A and 3B are part of the time code of the standard radio signal.
As shown in FIGS. 3 (a) and 3 (b), the time code is divided into 60 cycles of 1 minute (1 frame), and 1-bit information is allocated and transmitted every second.

The information transmitted by the time code is the binary number (BCD (Binary coded decimal notation) positive logic) for the hour, minute, day of the month, January 1st, year (last 2 digits), and day of the week. ) Send as represented.
Thus, sometimes it takes 6 bits to represent the time of the 24-hour JST, 7 bits for the minutes, 10 bits for the day of the week, 8 bits for the year, and 3 bits for the day of the week.

  As for the second signal, the second is the rising edge of the radio wave pulse signal, and 55% (the center of the 10% value and the 100% value) of the rising edge of the pulse is synchronized with the standard time 1 second signal.

The P signal is transmitted 7 times per frame, and the one corresponding to the minute (0 seconds) is called the marker M, and the ones corresponding to 9 seconds, 19 seconds, 29 seconds, 39 seconds, and 49 seconds are the positions. It is called markers P1 to P5.
The other position marker P0 normally corresponds to a rise of 59 seconds (in the case of non-leap seconds).

  This P signal continues to appear once in one frame, and when it continues for 59 seconds and 0 seconds, that is, when it continues with the position marker P0 and marker M, the position where this P signal appears is the minute position. That is, the time data such as the minute / hour data is determined in the frame based on the position of the minute part, so that the position of the minute part is accurately detected and the time data is extracted.

  However, the format of the standard radio wave frame is not the same every minute, as shown in FIG. 3A, formats other than 15 minutes and 45 minutes, and 15 hours per hour as shown in FIG. The format of the minutes and 45 minutes is different. For the spare bits named SU1 and SU2, and the leap second information named LS1 and LS2, the call code and stop information appear only in the format of 15 minutes and 45 minutes instead of year information and day information.

Thus, the standard time can be obtained by receiving the standard radio wave including the time code and decoding the pulse signal obtained therefrom.
The radio-controlled timepiece corrects the measured time based on the obtained standard time.

The control circuit 3 shown in FIG. 1 includes, for example, an arithmetic unit 31, a 30-digit counter 32, a 20-digit counter 33, and a decimal counter 34. Each of the counters 32 to 34 has an envelope detection signal S23 and an internal timer signal S31. Are connected to a gate group 4 controlled by a decimal count-up signal S32, a decimal count-up signal S33, and a decimal count-up signal S34.
When either the envelope detection signal S23 or the internal timer signal S31 is off, the gate group 4 is turned off and the counters 32-34 do not count the envelope detection signal S23.
When the time is corrected, the internal timer signal S31 and the envelope detection signal S23 output from the arithmetic unit are input to the gate group 4. Further, when any one of the 30-count count-up signal S32, the 20-decimal count-up signal S33, and the 10-decimal count-up signal S34 is input to any of the gate groups 4, the counters 32 to 34 corresponding to the count-up signals are provided. Any one of them starts counting for a predetermined time. When any one of the counters 32 to 34 reaches a predetermined count number, the counter 32 to 34 outputs one of the count-up signals S32 to S34 corresponding to each counter, the gate group 4 is switched off, and the envelope The input of the detection signal S23 to the control circuit 3 is interrupted, and the arithmetic unit 31 corrects the time.

  The control circuit 3 is connected to, for example, a crystal oscillator 5 (frequency: 32.768 kHz), a temperature sensor unit 6 that detects the temperature around the internal clock, and a notification unit 7 that notifies the execution of time correction. .

In the radio-controlled timepiece 1 according to the present embodiment, the temperature sensor unit 6 detects the temperature of the peripheral part of the internal clock at regular time intervals, the frequency at the standard temperature of the crystal oscillator 5 and the peripheral part of the internal clock at the time correction By accumulating the error from the frequency at the temperature for a predetermined time, it is calculated how much the time of the internal clock is different from the standard time. By calculating the time error in advance before executing the time correction, information necessary for time correction included in the standard radio signal is selected and received.
For example, when there is a difference of several seconds from the standard time, the minimum time unit necessary for time correction, in this case, second information is received from the standard time signal to correct the time.

  The crystal oscillator 5 has a secondary temperature coefficient, and an approximate time error can be calculated from the deviation of the frequency of the tuning-fork crystal oscillator from the standard temperature by the secondary temperature coefficient.

FIG. 4 is a typical example of temperature characteristics representing the relationship between the temperature (° C.) and the day difference (second / day) of the tuning fork type crystal resonator 5.
Moreover, the standard temperature is based on (+ 25 ° C. ± 5 ° C.), and the absolute value of the day difference increases as the measured temperature departs from the standard temperature.

   Next, a method for calculating the frequency error due to the temperature characteristics of the tuning fork type crystal resonator 5 will be described.

  In general, the tuning fork type crystal oscillator 5 having a period of 32.768 kHz has a temperature difference between the standard temperature and the temperature measurement of the peripheral portion of the internal clock 1 with reference to the standard temperature (+ 25 ° C. ± 5 ° C.). If <° C.>, the frequency deviation ΔF (ppm) is

(Expression 1) ΔF = −0.035 × <° C. ×× ° C. ppm
It is.
The standard temperature point is 0 ppm.

  For example, in the case of a temperature range of 0 to 50 ° C., (+ 25 ° C. ± 25 ° C.), the frequency deviation ΔF (ppm) is

(Equation 2)
ΔF = −0.035 × | ± 25 | × | ± 25 | = −21.875 ppm
It becomes.

Here, the frequency deviation ΔF (ppm) is a standard value. The maximum tolerance is ± 20% or less. The value obtained by adding the value of the room temperature deviation to the above equation [Equation 1] is the maximum deviation.
In addition, the frequency decreases as the measured temperature deviates from the standard temperature regardless of the temperature.

The control circuit 3 according to the present embodiment calculates an error from the standard time of the internal clock according to the temperature characteristics described above, and accumulates it for a predetermined time.
The accumulated error is classified into three types of reference marker and position, reference marker and minute information, or reference marker and minute information and time information, and a minimum time unit required for time correction is obtained.

  In the temperature sensor unit 6, for example, a power supply (VDD) 61 is applied to the thermistor 62 and the temperature measurement result in the thermistor 62 is input to the calculator 31.

The gate group 4 is composed of a plurality of AND elements.
In the embodiment of the present invention, for example, the envelope detection signal S23 and the internal timer signal S31 output from the computing unit 31 for a predetermined time are input to the input terminals of the AND elements 41, 42 and 43, respectively.
The output of the AND element 41 is connected to the input terminal of the AND element 44, the output of the AND element 42 is connected to the input terminal of the AND element 45, and the output of the AND element 43 is connected to the input terminal of the AND element 46.

  The AND elements 41, 42 and 43 determine the presence or absence of the envelope detection signal S32 and the internal timer signal S31, respectively, and when the envelope detection signal S32 and the internal timer signal S31 are input to the AND elements 41 to 43, respectively. AND elements 41, 42 and 43 output signals. If only one of envelope detection signal S32 or internal timer signal S31 is input to AND elements 41-43, AND elements 41, 42 and 43 Block the signal.

An input terminal of the AND element 44 receives the output of the AND element 41 and a 30-digit count-up signal S 32, and an output terminal of the AND element 44 is connected to an input of the 30-digit counter 32.
The output of the AND element 42 and a decimal count up signal S33 are input to the input terminal of the AND element 45, and the output terminal of the AND element 45 is connected to the input of the decimal counter 33.
The output of the AND element 43 and the decimal count up signal S34 are input to the input terminal of the AND element 46, and the output terminal of the AND element 46 is connected to the input of the decimal counter 34.

Now, it is assumed that the envelope detection signal S32 and the internal timer signal S31 are input to the AND elements 41, 42, and 43, and the AND elements 41, 42, and 43 are turned on.
At this time, the AND element 44 inputs the envelope detection signal S32 to the decimal counter 32 when the decimal count up signal S32 is switched to the low level.
The AND element 45 causes the envelope counter signal S32 to be input to the decimal counter 32 when the decimal count up signal S33 is switched to a low level.
Further, the AND element 46 inputs the envelope detection signal S32 to the decimal counter 34 when the decimal count up signal S34 is switched to the low level.
Contrary to the above example, the AND element 44 blocks the input of the envelope detection signal S32 to the decimal counter 32 when the decimal count up signal S32 is switched to the high level.
The AND element 45 cuts off the input of the envelope detection signal S32 to the decimal counter 32 when the decimal count up signal S33 is switched to a high level.
The AND element 46 blocks the input of the envelope detection signal S32 to the decimal counter 34 when the decimal count up signal S34 is switched to a high level.

  In order to select information necessary for time correction when receiving a standard radio signal, the radio wave correction timepiece 1 according to the present embodiment inputs a predetermined time envelope detection signal S23 to each of the counters 32, 33 and 34, The envelope detection signal S23 is counted, and the case is divided according to the count value of each counter.

  In the embodiment of the present invention, when the 30-digit counter 32 counts 30 clocks in 30 seconds, it is determined that there is no noise in the envelope detection signal S23, second / minute / hour information is acquired, and the time is corrected. When the decimal counter 32 counts 30 clocks or less or 30 clocks or more in 30 seconds, acquisition of all time information is stopped and the state of the decimal counter 33 is referred to.

In the above embodiment, when the time taken for the 20-count counter 33 by 30 seconds and the total time of 10 seconds is 30 seconds, it is determined that the envelope detection signal 23 includes weak noise, and the reference Acquires marker and minute information and corrects the time.
If the time taken by the decimal counter 33 for 20 seconds and the sum of 10 seconds is 30 seconds or more or less than 30 seconds, acquisition of all information is stopped and the state of the decimal counter 34 is changed. refer.

In the above embodiment, when the time taken by the decimal counter 34 for 10 seconds and the total of 20 seconds is 30 seconds, it is determined that the envelope detection signal 23 includes moderate noise. The reference marker and position are acquired, and the time is corrected.
When the time taken by the decimal counter 34 for 10 seconds and the total of 20 seconds is 30 seconds or more or less than 30 seconds, all information acquisition is interrupted and the normal operation is resumed.

  When the time adjustment is performed, the notification circuit 7 notifies the execution of the time adjustment for each second information, minute information, and hour information using, for example, at least one light emitting element.

The notification circuit 7 is one of the embodiments of the present invention, and has three LEDs 72, 73 and 74, and one LED represents one of seconds, minutes or hours. In an embodiment of the present invention, LED 72 represents seconds, LED 73 represents minutes, and LED 74 represents hours.
A power supply (VDD) 71 is connected to the anode of each LED. Furthermore, the notification circuit 7 has transistors 75, 76 and 77, the collector terminals of the transistors 75 to 77 are connected to the cathodes of the LEDs 72 to 74, the emitter terminals of the transistors 75 to 77 are grounded, Each base terminal of the transistors 75 to 77 is connected to the control circuit 3.

When the time adjustment is performed, the notification circuit 7 sends at least one of the second, minute, and hour signals from the control circuit 3 to the notification circuit 7, and the transistors 72 to 74 are turned on to execute the time adjustment. At least one LED blinks in seconds, minutes or hours.
For example, when only the second information is corrected, the second information LED 72 blinks, and when all the seconds, minutes, and hours are corrected, all the LEDs 72 to 74 blink.

  FIG. 5 shows an embodiment of the radio-controlled timepiece 1 of the present invention.

  Next, FIG. 6 and FIG. 7 show a time correction processing procedure according to the embodiment of the present invention.

6 and 7, starting from a time correction process (START), starting from a certain arbitrary time, if time correction is necessary, one or more time corrections of seconds, minutes, and hours are completed. The process up to is shown.
6 are connected to A, B, and C shown in FIG. 7, respectively.

  In the radio-controlled timepiece 1 of the present embodiment, the temperature around the internal timepiece is measured every 60 seconds (ST1) by the temperature sensor 6 (ST2). A frequency error is calculated by a secondary temperature coefficient with reference to the temperature measurement result as a data table (ST3), and the frequency error is accumulated for 60 minutes (ST4).

If the accumulated frequency error is not less than 1 second and less than 60 seconds in step ST5, it is determined that the internal clock is shifted from the standard time in units of seconds, and the LED 72 indicating the second blinks (ST6).
If the accumulated frequency error is not greater than 1 second and less than 60 seconds in step ST5, it is determined in step ST7 whether the accumulated frequency error is less than 60 minutes. If the accumulated frequency error is less than 60 minutes, the minute The LED 73 representing the hour blinks (ST8), and if the accumulated frequency error is not less than 60 minutes in step ST7, the LED 74 representing the hour blinks (ST9).

  When 60 minutes have elapsed from the start point (START) of the time correction process, it is determined whether or not to receive a standard radio wave signal (ST10).

If it is determined in step ST10 that the elapsed time is less than 60 minutes, the process returns to the initial operation (START), and if the elapsed time is 60 minutes or more in step ST10, a case of an accumulated frequency error is performed.
At this time, the reset signal S35 becomes high level, all the counters 32-34 are reset, and the count-up signals S32-S34 are maintained at low level.

If it is determined in step ST11 that the accumulated frequency error is less than 1 second, the internal timer output signal S31 is switched to the high level and maintained at the high level for 30 seconds (ST12), and the AND elements 41 to 43 of the gate group 4 are turned on. The decimal counter signal S34 becomes low level, the AND element 46 is turned on, and the decimal counter 34 starts counting (ST13).
At this time, the count-up signals S32 and S33 are maintained at a high level, and the AND elements 44 and 45 are kept off.

  After the envelope detection signal S23 is counted 10 times by the decimal counter 34 for 30 seconds, the count-up signal S34 is switched to the high level, and the envelope detection signal S23 input to the decimal counter 34 is changed to 30 seconds in step ST14. When it is determined that the sum of the time required for 10 counts and 20 seconds is 30 seconds, it is determined that the standard radio signal includes noise, and the position is received three times with the reference marker (ST15). After reception is completed (ST16) Then, the time of the second is corrected (ST17), the reset signal R is changed to the high level, the second accumulated error is reset (ST16), and the operation returns to the initial operation (START).

  If it is determined in step ST14 that the sum of the time required for 10 clock counts and 20 seconds is 30 seconds or more or less than 30 seconds, the acquisition of the standard radio signal is stopped, and the initial operation (START) is returned.

If it is determined in step 11 that the accumulated frequency error is 1 second or more and in step 19 it is determined that the accumulated frequency error is less than 60 minutes (ST19), the internal timer output signal S31 is switched to the high level and maintained at the high level for 30 seconds. (ST20), the AND elements 41 to 43 of the gate group 4 are turned on, the decimal counter signal S34 and the decimal counter signal S33 are at low level, the AND elements 45 and 46 are turned on, and the decimal counter 34 is turned on. The counting of the decimal counter 33 is started (ST21).
At this time, the count-up signal S32 is maintained at a high level, and the AND element 44 is maintained off.

  After the envelope detection signal S23 is counted 10 times by the decimal counter 34 for 30 seconds and the envelope detection signal S23 is counted 20 times by the decimal counter 33, the count-up signals S33 to S34 are respectively switched to a high level, and in step ST22, When the envelope detection signal S23 input to the decimal counter 33 is 30 seconds, the total of the time required for 20 counts in 30 seconds and 10 seconds is 30 seconds, it is determined that the standard radio signal contains weak noise, and the reference marker And minute information is received (ST23), and after completion of reception (ST24), the time of the minute and second is corrected (ST25).

If it is determined that the accumulated frequency error is 60 minutes or less after the time is corrected in step ST25 (ST26), the reset signal R is switched to the high level, and the second, minute, and hour accumulated errors are reset (ST27). ) Return to the initial operation (START).
After the time adjustment in step ST25, if the accumulated frequency error is not 60 minutes or less, the reset signal R switches to the high level, resets the seconds, minutes, and accumulated error (ST28), and returns to the initial operation (START).

  In step ST22, when the envelope detection signal S23 input to the decimal counter 33 is equal to or longer than 30 seconds or less than 30 seconds, the process proceeds to step ST14 and decimal. The state of the counter 34 is confirmed.

  When it is determined in step ST11 that the accumulated frequency error is 1 second or longer and in step ST19 it is determined that the accumulated frequency error is 60 minutes or longer, the internal timer output signal S31 is switched to the high level and maintained at the high level for 30 seconds (ST29). ), The AND elements 41 to 43 of the gate group 4 are turned on, the decimal counter signal S34, the decimal counter signal S33, and the decimal counter signal S32 are at low level, and the AND elements 44 to 46 are turned on. Counting of the decimal counter 34, the decimal counter 33, and the decimal counter 32 is started (ST30).

  The envelope detection signal S23 is counted 10 times by the decimal counter 34 for 30 seconds, the envelope detection signal S23 is counted 20 times by the decimal counter 33, and the envelope detection signal S23 is counted 30 times by the decimal counter 32, and then counted up. Each of the signals S32 to S34 is switched to a high level. In step ST31, when the envelope detection signal S23 input to the decimal counter 32 is 30 clocks in 30 seconds, it is determined that there is no noise in the standard radio signal, Receives time code for 60 seconds (ST32), completes reception (ST33), corrects the time for seconds, minutes, and hours (ST34), resets the reset signal R to high level, and resets the accumulated error for seconds, minutes, and hours (ST35) Return to the initial operation (START).

  If it is determined in step ST31 that the time required for the 30 clock count is 30 seconds or more or less than 30 seconds, the process proceeds to step ST22 to check the state of the decimal counter 33.

  In any case, when the standard radio wave reception is not completed (ST16, ST24, ST33), the process returns to the initial operation (START).

FIG. 8 shows an example of a time chart according to the embodiment of the present invention.
However, FIG. 8 shows the case where the accumulated frequency error is 60 minutes or more in step ST17 shown in FIG. 7, and the explanation of this time chart will also describe the operation from step 29 to step 35 shown in FIG.
8 indicate the clock number of the envelope detection signal S23, and the clock number 1 is the time when the envelope detection signal S23 starts counting.

Immediately before counting the clock of the envelope detection signal S23, the reset signal S35 goes high, all the counters 32-34 are reset, and the count-up signals S32-S34 are kept low.
When the accumulated frequency error is 60 minutes or more, the internal timer output signal S31 is switched to the high level and is maintained at the high level for 30 seconds, the AND elements 41 to 43 of the gate group 4 are turned on, the decimal counter signal S34, The decimal counter signal S33 and the decimal counter signal S32 become low level, the AND elements 44 to 46 are turned on, and the envelope detection signal S23 is input to each counter, and the decimal counter 34 and the decimal counter 33 The count of the decimal counter 32 is started.

  After counting the envelope detection signal S23 by 10 for 30 seconds with the decimal counter 34, the count-up signal S34 switches to high level, and after counting the envelope detection signal S23 for 20 with the decimal counter 33, the count-up signal S33 is high. After switching to the level and counting the envelope detection signal S23 by the 30-digit counter 32 for 30 times, the count-up signal S32 is switched to the high level.

  When the envelope detection signal S23 input to the decimal counter 32 is 30 clocks in 30 seconds, it is determined that there is no noise in the standard radio signal, a time code is received for 60 seconds, and after completion of reception, the seconds, minutes Then, the time of the hour is corrected, the reset signal R is switched to the high level, the second, minute and hour accumulated errors are reset, and the initial operation is resumed.

In the envelope detection signal S23 input to the decimal counter 32, when it is determined that the time required for 30 clock counting is 30 seconds or more or less than 30 seconds, the state of the decimal counter 33 is confirmed.
If the total of 10 seconds and the time required for 20 counts in 30 seconds is 30 seconds, the decimal counter 33 determines that the standard radio signal contains weak noise, receives the reference marker and minute information, and receives them. After completion, correct the minutes and seconds.
When it is determined that the accumulated frequency error is 60 minutes or less after the time correction is performed, the reset signal R is switched to the high level, the second, minute, and hour accumulated errors are reset to return to the initial operation.
If the accumulated frequency error is not 60 minutes or less after the time correction is performed, the reset signal R switches to the high level, resets the seconds, minutes, and accumulated error, and returns to the initial operation.

In the envelope detection signal S23 input to the decimal counter 32, it is determined that the time required for 30 clock counting is 30 seconds or more or less than 30 seconds, and the time required for 20 counts in 30 seconds by the decimal counter 33 is When it is determined that the total of 10 seconds is 30 seconds or more or less than 30 seconds, the state of the decimal counter 34 is confirmed.
When the counter 34 determines that the total of 20 seconds and the time required for 10 counts in 30 seconds is 30 seconds, it is determined that the standard radio signal contains noise, and the position reception with the reference marker is performed three times. Thereafter, the time of the second is corrected, the reset signal R is switched to the high level, the second accumulated error is reset, and the initial operation is returned to.
When the counter 34 determines that the total of 20 seconds and the time required for 10 clock counts in 30 seconds is 30 seconds or more or less than 30 seconds, the acquisition of the standard radio signal is stopped and the initial operation is returned to.

  As described above, according to the present invention, the temperature around the internal clock is measured, and the accumulated frequency error between the measured temperature of the crystal oscillator and the standard temperature is obtained for a predetermined time. In addition, the envelope detection output waveform included in the standard radio signal counts the clock input to the internal counter within a predetermined time, and selects and receives information necessary for time correction from the accumulated frequency error and count value. To do. Therefore, the present invention can reduce the influence of the noise on the time correction, can minimize the time required for the time correction, and can perform the time correction efficiently.

It is a circuit block diagram which shows one Example of the control circuit of the electromagnetic wave correction watch which concerns on this invention. It is a figure for demonstrating the electromagnetic wave reception state in the control circuit which concerns on this invention. (A) is a specific example of a standard radio wave signal, (b) is a specific example of an output waveform when the reception state is good, (c) is a specific example of an output waveform when the radio wave is very weak, (d) Shows a specific example of an output waveform when there is a lot of noise. It is an example of the time code of a standard time radio signal. An example of the temperature characteristic of the crystal oscillator shown in FIG. 1 is shown. 1 is a specific example of the appearance of the radio-controlled timepiece of the present invention, and the LED in the figure is a display example by the notification circuit shown in FIG. 3 is a flowchart showing a specific example of the operation of the radio wave correction timepiece shown in FIG. 1. 3 is a flowchart showing a specific example of the operation of the radio wave correction timepiece shown in FIG. 1. It is a time chart which shows a specific example of operation | movement of the electromagnetic wave correction watch shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Radio correction clock, 2 ... Standard radio signal receiving system, 3 ... Control circuit, 4 ... Gate group, 5 ... Crystal oscillator, 6 ... Temperature sensor, 7 ... Notification circuit

Claims (7)

A radio-controlled timepiece that receives a radio signal including a standard time signal and corrects the time of the internal clock,
Receiving means for receiving the radio wave signal;
In the receiving means, the received radio wave signal is monitored for a predetermined time, and when at least one time information necessary for the time adjustment is acquired at the monitoring time, the time of the internal clock is corrected by the acquired time information. A radio-controlled timepiece having control means. The receiving means outputs an envelope detection signal of the radio signal,
The radio-controlled timepiece according to claim 1, wherein the control means counts the envelope detection signal for a predetermined time and acquires the time information according to the count value. The control means obtains count values as second information, minute information, and hour information, each of which has a different set count value, and which counter has reached the count value within the predetermined time. The radio wave correction timepiece according to claim 2, wherein time information for time correction is acquired. Oscillation means for oscillating at a predetermined frequency;
Detection means for detecting the ambient temperature of the oscillation means;
The control means detects an error between the frequency of the oscillating means and the frequency of the oscillating means at a standard temperature based on the information on the temperature characteristics of the oscillating means and the detection result of the detecting means, and calculates the calculated error information. The radio-controlled timepiece according to claim 1, wherein the time to be corrected is corrected by: The radio wave according to any one of claims 1 to 4, wherein the detection means detects an error between the frequency of the oscillation means and the frequency of the oscillation means at a standard temperature based on information on temperature characteristics of the oscillation means. Correction clock. 6. The detecting means detects an error between the frequency of the oscillating means and the frequency of the oscillating means at a standard temperature based on information on temperature characteristics of the oscillating means, and accumulates the error for a predetermined time. Radio wave correction clock given in any 1 statement. The radio-controlled timepiece according to any one of claims 1 to 4, wherein the control means includes at least one notifying means for notifying information that can be acquired within the predetermined time.

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