JP5978784B2 - Radio correction clock and control method of radio correction clock - Google Patents

Description

  The present invention relates to a radio-controlled timepiece and a method for controlling a radio-controlled timepiece.

Conventionally, a radio-controlled timepiece that receives a standard radio wave including time information and corrects an internal time based on the time information is known (see, for example, Patent Document 1).
The radio-controlled timepiece disclosed in Patent Document 1 is operated in accordance with a scheduled reception operation for receiving a standard radio wave when the internal time (time information in the time data storage unit) reaches a predetermined time, and an operation of an external input unit. The forced reception operation for receiving the standard radio wave is performed, and the internal time is corrected based on the time information included in the received standard radio wave.
In the radio-controlled timepiece described in Patent Document 1, the number of drive trials of the receiving means for receiving the standard radio wave during the regular reception operation is different from the number of drive trials of the reception means during the forced reception operation. Yes. For example, the number of drive trials when the scheduled reception operation is performed is set to three, and the number of drive trials when the forced reception operation is performed is set to one. With such a configuration, the radio-controlled timepiece suppresses power consumption.

JP 2005-227203 A

  By the way, when time information is already stored in the radio-controlled timepiece by receiving a standard radio wave in the past, it is not necessary to acquire all information (date information and time information) at the next reception. In detail, the date included in the internal time, and “hour” and “minute” do not deviate so much, but “second” tends to deviate, so if the information of the “second” is acquired at least, the internal time is corrected. it can. Thus, when only specific information is acquired, since the amount of information to be acquired is small, the probability that the specific information is not properly received under the influence of noise or the like is relatively low, and errors (incorrect The probability that information will be acquired) is relatively low. For this reason, since the standard radio wave reception process can be completed with a small number of times, power consumption can be suppressed.

  On the other hand, when the control IC returns from the time of factory shipment or when the power is not supplied to the control IC due to the remaining battery level, the radio-controlled clock is reset (initialized). It is not stored in the radio wave correction watch. In such a case, it is necessary to acquire time information for one frame from the standard radio wave. However, in this case, since the amount of information to be acquired is large, there is a relatively high probability that any of the pieces of information included in the time information for one frame is not properly received due to the influence of noise or the like. The possibility that the above error will occur is relatively high.

In order to solve such a problem, it is conceivable to increase the number of times of reception of the standard radio wave (in this case, the number of times of reception of the standard radio wave for 1 minute) to reliably acquire time information for the one frame. However, in such a case, the reception time of the standard radio wave becomes long and the power consumption increases.
Therefore, if the standard radio wave reception process is executed the same number of times when the time information is already stored and when it is not stored, appropriate time information cannot be acquired on the one hand, and power consumption increases on the other hand. There is a problem.

  An object of the present invention is to provide a radio-controlled timepiece and a radio-controlled timepiece control method capable of appropriately acquiring time information and reducing power consumption.

  The radio-controlled timepiece according to the present invention includes a receiving unit that receives a standard radio wave, a time correcting unit that corrects an internal time based on time information included in the standard radio wave received by the receiving unit, and a memory that stores the time information. Storage means, display means for displaying the internal time, and control means for controlling the receiving means. The control means stores the time information in the storage means when receiving the standard radio wave. If the standard time signal is received, the maximum number of times of reception, which is the number of times the time information transmitted every frame is acquired, is set to the first number, and the time information is stored. If not, the maximum value of the number of receptions is set to a second number greater than the first number.

  Note that the number of receptions indicates the number of times the standard radio wave reception process within the transmission period is executed for each standard radio wave transmission period (that is, one minute) including time information of one frame. That is, when the number of receptions is a plurality of times, the standard radio wave reception process is executed every time the transmission period elapses. The number of times of reception is, for example, demodulating a received signal according to the received standard radio wave to acquire time information for one frame, and acquiring at least one piece of information from the acquired time information for one frame Or a specific part of the received signal corresponding to the received standard radio wave and demodulating the specific part of the time information.

  According to the present invention, the maximum value of the standard radio wave reception count when the time information is not stored is larger than the maximum value of the standard radio wave reception count when the time information is stored. According to this, by increasing the number of times of reception of the standard radio wave when correcting the time (in this case, the number of times of reception of the standard radio wave for 1 minute), the success probability of the standard radio wave reception process can be increased. The probability that information is appropriately acquired can be increased. Therefore, when time information is not stored and it is necessary to acquire time information for one frame, the time information can be appropriately acquired and the internal time can be appropriately corrected.

On the other hand, when the time information is already stored and only specific information (for example, “second” information) in the time information for one frame is acquired, all the time information for one frame is acquired. In comparison, since the probability of occurrence of the error is low, the specific information can be acquired and the time can be corrected even if the maximum number of times of reception of standard radio waves is small. In this case, since the number of receptions can be reduced, power consumption can be reduced.
Therefore, time information can be acquired appropriately, and power consumption can be reduced when time information is already stored.

  In addition, as described above, the maximum value of the number of receptions is set for each of the cases where the time information is not stored and the case where the time information is stored. According to this, when the state where the reception of the standard radio wave and the acquisition of the time information are not successful continues, the reception process is stopped when the number of trials for receiving the standard radio wave reaches the maximum value. Therefore, it is possible to suppress the wasteful power consumption by continuously executing the reception process in a situation where the standard radio wave cannot be received.

In the present invention, when the control unit determines that the reception of the standard radio wave is successful by the reception unit, and the success / failure determination unit determines that the reception of the standard radio wave is successful, the reception unit It is preferable to include a reception control unit that terminates the reception process by the means.
According to the present invention, when the success / failure determination unit determines that the reception of the standard radio wave is successful, the reception control unit ends the reception process by the reception unit. According to this, even when the number of times of reception of the standard radio wave does not reach the maximum value, the reception process of the standard radio wave can be terminated if the time information is acquired appropriately. Therefore, unnecessary power consumption can be suppressed.

The radio-controlled timepiece control method of the present invention is a radio-controlled timepiece control method that receives a standard radio wave including time information and corrects an internal time based on the time information. When the time information is stored at the time of reception, the maximum number of reception times, which is the number of times of receiving the standard radio wave and acquiring the time information transmitted for each frame, is set to the first number of times. When the time information is not stored, the maximum value of the number of receptions is set to a second number greater than the first number.
According to the present invention, an effect similar to that of the above-described radio-controlled timepiece can be obtained.

1 is a block diagram showing a configuration of a radio wave correction timepiece according to a first embodiment of the present invention. The flowchart which shows the reception control process in the said embodiment. The block diagram which shows the structure of the main control part in the said embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[Schematic configuration of radio-controlled clock]
FIG. 1 is a block diagram showing a configuration of a radio-controlled timepiece 1 according to the present embodiment.
The radio-controlled timepiece 1 according to the present embodiment receives a long-wave standard radio wave (hereinafter abbreviated as “standard radio wave”), acquires time information included in the standard radio wave, and sets the internal time being measured as the time information. Modify based on. As shown in FIG. 1, the radio-controlled timepiece 1 includes an antenna 2, a receiving circuit 3, a control circuit 4, an oscillator 5, a display unit 6, and an operation unit 7.

The antenna 2 receives the standard radio wave and outputs a reception signal corresponding to the received standard radio wave to the reception circuit 3.
The receiving circuit 3 causes the antenna 2 to receive a radio wave of a specific frequency, demodulates a TCO (Time Code Out) signal based on the received signal input from the antenna 2, and converts the TCO signal Output to the control circuit 4.
These antenna 2 and receiving circuit 3 constitute the receiving means of the present invention. The configuration of the receiving circuit 3 will be described in detail later.

The control circuit 4 controls the operation of the radio wave correction timepiece 1. For example, the control circuit 4 outputs a control signal to the receiving circuit 3 to control the operation of the receiving circuit 3. Further, the control circuit 4 decodes the TCO signal input from the receiving circuit 3 to generate a TC (Time Code), and corrects the internal time based on the TC. Further, the control circuit 4 causes the display means 6 to display the internal time. The configuration of such a control circuit 4 will be described in detail later.
The oscillator 5 includes a crystal resonator and outputs a reference signal having a predetermined reference clock frequency (for example, 32.768 kHz) oscillated by the crystal resonator. The reference signal output from the oscillator 5 is input to the control circuit 4 and is divided by the control circuit 4 into a 1 Hz signal.

The display means 6 displays the internal time measured by the control circuit 4. The display means 6 can be configured by a liquid crystal panel, and can also be configured to include a dial plate and a pointer, a step motor for rotating the pointer, and a plurality of gears.
The operation means 7 is constituted by, for example, a crown or a button exposed to the outside of the radio-controlled timepiece 1, and outputs an operation signal corresponding to the operation by the user to the control circuit 4. As such operation signals, the types of standard radio waves received by the antenna 2 (for example, standard radio waves JJY (carrier frequency: 40 kHz, 60 kHz) in Japan, standard radio waves WWVB (carrier frequency: 60 kHz) in the United States, standard radio waves in the United Kingdom) A signal indicating MSF (carrier frequency: 60 kHz) and a standard radio wave DCF77 (carrier frequency: 77.5 kHz) in Germany, a signal for receiving the standard radio wave to correct the internal time, and the internal time are corrected. Therefore, a signal for presetting the time for receiving the standard radio wave can be used.

[Configuration of receiving circuit]
The receiving circuit 3 demodulates the TCO signal from the received signal input from the antenna 2 under the control of the control circuit 4, and outputs the TCO signal to the control circuit 4. The receiving circuit 3 includes a tuning circuit 31, a first amplifier circuit 32, a local oscillation signal generator 33, a frequency converter 34, a BPF (Band-pass filter) 35, a second amplifier circuit 36, a detector circuit 37, and a binarization. A circuit 38 and a decode circuit 39 are provided.
Among these, the decode circuit 39 decodes the control signal input from the control circuit 4 and outputs the control content indicated by the control signal to the functional units 31 to 38.

  The tuning circuit 31 includes a capacitor, and the tuning circuit 31 and the antenna 2 constitute a parallel resonance circuit. The tuning circuit 31 causes the antenna 2 to receive a radio wave having a specific frequency. The tuning circuit 31 converts the standard radio wave received by the antenna 2 into a voltage signal and outputs the voltage signal to the first amplifier circuit 32 as a received signal.

Specifically, when a signal indicating the type of standard radio wave to be received is input to the control circuit 4 in response to an operation on the operation means 7, a control signal for receiving the standard radio wave is transmitted from the control circuit 4 to the decode circuit 39. To the tuning circuit 31. In response to the input of the control signal, the tuning circuit 31 sets the antenna 2 so as to be able to receive the standard radio wave.
As described above, in the present embodiment, the type of the received standard radio wave is switched according to the operation on the operation unit 7. For example, the received standard radio wave is automatically switched by sequentially switching the reception frequency. It is good also as a structure to detect to. The receiving circuit 3 is configured to be able to receive standard radio waves JJY, WWVB, MSF, and DCF 77, but may be configured to receive other standard radio waves such as a Chinese standard radio wave BPC.

  The first amplifier circuit 32 amplifies the reception signal input from the tuning circuit 31 to a constant amplitude. When an AGC (Auto Gain Control) circuit is provided, the AGC circuit adjusts the gain of the first amplifier circuit 32 based on the signal level of the envelope signal generated by the detection circuit 37. It is good.

The local oscillation signal generation unit 33 generates a local oscillation signal output to the frequency conversion unit 34. Specifically, the local oscillation signal generation unit 33 generates a signal having a predetermined frequency based on the above-described reference signal input from the control circuit 4, and generates a local oscillation signal by dividing the signal. To do. This local oscillation signal is oscillated at a local oscillation frequency for aligning the frequency of the reception signal output from the frequency converter 34 with a predetermined intermediate frequency (for example, the center frequency of the crystal filter of the BPF 35). That is, in order to effectively remove noise by the crystal filter, the local oscillation signal generation unit 33 is obtained by mixing the reception signal output from the first amplifier circuit 32 and the local oscillation signal in the frequency conversion unit 34. The local oscillation signal having a frequency that matches the frequency of the processing signal (the intermediate frequency that is the difference between the frequency of the reception signal and the frequency of the local oscillation signal) with the center frequency of the crystal filter of the BPF 35 is generated.
For example, when the center frequency of the crystal filter is 30 kHz and a standard radio wave of 40 kHz is received, the local oscillation signal generation unit 33 outputs a 70 kHz local oscillation signal to the frequency conversion unit 34. When a 60 kHz standard radio wave is received, the local oscillation signal generator 33 outputs a 90 kHz local oscillation signal. Further, when a standard radio wave of 77.5 kHz is received, the local oscillation signal generation unit 33 outputs a local oscillation signal of 107.5 kHz.

The frequency conversion unit 34 mixes the reception signal input from the first amplifier circuit 32 and the local oscillation signal input from the local oscillation signal generation unit 33 and outputs the intermediate frequency processing signal to the BPF 35. . That is, assuming that the frequency of the received signal is f0 and the frequency of the local oscillation signal is f1, the frequency converter 34 generates a processing signal having an intermediate frequency fIF1 = | f0−f1 | and outputs it to the BPF 35.
The frequency conversion unit 34 receives local oscillation signals having local oscillation frequencies of 70 kHz, 90 kHz, and 107.5 kHz corresponding to the respective standard radio waves of 40 kHz, 60 kHz, and 77.5 kHz, and the local oscillation signal generation unit 33. It is input from. For this reason, the frequency of the processing signal output from the frequency converter 34 is 30 kHz.

  The BPF 35 passes only the signal component of a predetermined frequency band among the processing signals input from the frequency converter 34 and blocks the signal of the frequency component outside the band. The BPF 35 includes a crystal filter, and the center frequency of the crystal filter is set to 30 kHz. That is, noise is effectively removed by matching the frequency of the processing signal output from the frequency converter 34 to the center frequency of the crystal filter.

The second amplifier circuit 36 further amplifies the reception signal input from the BPF 35 with a fixed gain.
Although not shown in detail, the detection circuit 37 includes a rectifier and an LPF (Low-Pass Filter), rectifies and filters the reception signal input from the second amplification circuit 36, and converts the obtained envelope signal into two. It outputs to the value conversion circuit 38.
The binarization circuit 38 is composed of, for example, a binarization comparator. The binarization circuit 38 compares the signal level of the envelope signal input from the detection circuit 37 with the voltage level of the reference voltage, and generates a TCO signal that is a binarization signal. Then, the binarization circuit 38 outputs the TCO signal to the control circuit 4.

[Configuration of control circuit]
The control circuit 4 controls the operation of the entire radio-controlled timepiece 1 as described above. The control circuit 4 includes a TCO decoding unit 41, a storage unit 42, a time measuring unit 43, a time correcting unit 44, a drive control unit 45, and a main control unit 46.
The TCO decoding unit 41 decodes the TCO signal input from the receiving circuit 3 and extracts TC from the TCO signal. This TC includes date information and time information. Then, the TCO decoding unit 41 outputs the extracted TC to the main control unit 46 and stores it in the storage unit 42. In the present embodiment, the TCO decoding unit 41 is configured to be able to decode TCs of a plurality of types of standard radio waves, such as the standard radio waves JJY, WWVB, MSF, DCF77, and the like.

The storage unit 42 corresponds to storage means of the present invention, and stores various data and programs necessary for controlling the radio-controlled timepiece 1 by the control circuit 4. For example, the storage unit 42 stores the TC acquired by the above-described TCO decoding unit 41 and also stores the internal time in the radio-controlled timepiece 1.
The clock unit 43 updates the internal time stored in the storage unit 42 based on the 1 Hz signal generated from the reference signal input from the oscillator 5, thereby counting the current date and time.

The time correction unit 44 corresponds to the time correction unit of the present invention, and corrects the internal time stored in the storage unit 42 based on the TC acquired by the TCO decoding unit 41.
The drive control unit 45 controls the drive of the display unit 6 to display the internal time on the display unit 6. For example, when the display unit 6 is configured by a liquid crystal panel, the drive control unit 45 displays the internal time on the liquid crystal panel. Further, when the display means 6 is configured to have a dial and a pointer, and a stepping motor and a gear that rotate the pointer, the drive control unit 45 outputs a pulse signal to the stepping motor, Display internal time. Note that the date and time may be displayed in addition to the current time.

[Configuration of main controller]
The main controller 46 is driven based on the reference signal input from the oscillator 5 and executes various control processes. For example, the main control unit 46 outputs the reference signal input from the oscillator 5 to the receiving circuit 3 and also outputs the control signal to the decoding circuit 39 described above. A control signal input from the main control unit 46 to the decode circuit 39 is transmitted via a serial communication line. That is, the main control unit 46 corresponds to the control means of the present invention.

FIG. 2 is a flowchart showing a reception control process executed by the main control unit 46. FIG. 3 is a functional block diagram showing the configuration of the main control unit 46.
Such a main control unit 46 receives the standard radio wave and performs an operation for executing the process of correcting the internal time (forced time correction process) on the operation unit 7 or the internal time at a preset time. And when the process of correcting the internal time (fixed time correction process) is performed, the reception control process shown in FIG. 2 is executed. This reception control process is a process of setting the maximum value of the number of times of reception of the standard radio wave based on whether or not TC is already stored, and executing the standard radio wave reception process to correct the internal time.
In order to execute such processing, the main control unit 46, as shown in FIG. 3, includes a TC determination unit 461, a maximum value setting unit 462, a reception control unit 463, a first trial number determination unit 464, and a success / failure determination unit 465. And a second trial number determination unit 466 functionally.

  In this reception control process, as shown in FIG. 2, first, the TC determination unit 461 determines whether or not a TC corresponding to the standard radio wave to be received is stored in the storage unit 42 (step S1). Therefore, even when a standard radio wave that is not a reception target is received in a different place in the past and a TC corresponding to the standard radio wave is stored, the TC determination unit 461 stores a TC corresponding to the standard radio wave that is a reception target. If not, it is determined in step S1 that TC is not stored.

Next, the maximum value setting unit 462 determines the maximum number of times of reception of standard radio waves (number of times of reception of standard radio waves for one minute) performed in one reception process based on the determination result by the TC determination unit 461. Set the value.
Specifically, when the TC determination unit 461 determines that TC is stored, the maximum value setting unit 462 sets the maximum value to s (eg, “10”) (step S2). This s corresponds to the first number of times of the present invention.
On the other hand, when it is determined that TC is not stored, the maximum value setting unit 462 sets the maximum value to t (for example, “15”) that is a value larger than s (step S3). This t corresponds to the second number of times of the present invention.
These maximum values can be changed as appropriate.

  After step S2 or step S3, the reception control unit 463 controls the operation of the reception circuit 3 and causes the reception circuit 3 to execute standard radio wave reception processing (step S4). At this time, the reception control unit 463 outputs a control signal indicating the type of standard radio wave to be received to the decoding circuit 39. Thus, the standard radio wave can be received by the tuning circuit 31 and the antenna 2 described above.

  Thereafter, the first trial number determination unit 464 determines whether or not the number of times of reception of the standard radio wave for one minute (number of trials) already executed exceeds a predetermined value, that is, the standard radio wave reception process is performed a predetermined number of times. Is determined (step S5). In step S5, it is determined whether or not the number of trials exceeds a predetermined value. In step S6, whether or not the acquired TC is appropriate data is determined by verifying the TC. This is because it is necessary to obtain multiple times.

In the present embodiment, such a predetermined value is set to a value equal to or less than the aforementioned maximum value. That is, when s (first number of times) is set as the maximum value, a value equal to or less than s is set as the predetermined value, and when t (second number of times) is set as the maximum value. Is set to a value equal to or less than t for the predetermined value. For this reason, the predetermined value may be “1” or the same value as the maximum value. Also, a different value is set for the predetermined value when s is set as the maximum value (when TC is already stored) and when t is set (when TC is not stored). May be. For example, in the former case, the predetermined value may be “1”, and in the latter case, the predetermined value may be “m (1 ≦ m ≦ t)”.
Such a predetermined value may be set in advance, or may be set according to the maximum value set by the maximum value setting unit 462.

Here, if the first trial number determination unit 464 determines that the number of trials does not exceed the predetermined value (not performed a predetermined number of times), the reception control process returns to step S4, and the reception control unit 463 Under the control, the reception process of the standard radio wave is continued.
On the other hand, if the first trial number determination unit 464 determines that the number of trials has exceeded a predetermined value (performed a predetermined number of times), the success / failure determination unit 465 receives the standard radio wave from the TCO decoding unit 41 in response to the start of reception. By determining whether or not the input TC is appropriate data, it is determined whether or not the standard radio wave has been successfully received (step S6). That is, the success / failure determination unit 465 determines whether or not the TC (one frame TC) input after the start of the reception process of the standard radio wave is appropriate data, and determines that it is successful if appropriate. If not appropriate, it is determined as unsuccessful.

  Here, when TC is not stored, TC for one frame (TC for one minute) needs to be acquired appropriately. Therefore, the success / failure determination unit 465 determines whether or not the entire TC for one frame is appropriate when the TC determination unit 461 determines that the TC is not stored. For example, the success / failure determination unit 465 determines that the reception of the standard radio wave has been successful when TCs each having a time difference of 1 minute are acquired continuously a predetermined number of times. At this time, the date indicated by the date information of each TC may be added to the determination condition, and such a determination condition can be appropriately changed.

  On the other hand, when the TC is stored, it is not necessary to properly acquire all of the TC for one frame. If some information (for example, “minute” and “second” information) is acquired, Good. Therefore, the success / failure determination unit 465 determines whether or not the partial information is appropriate when the TC determination unit 461 determines that the TC is stored. For example, when acquiring only “second” information, the success / failure determination unit 465 succeeds in receiving the standard radio wave when the marker indicating the timing of “0 second” is continuously acquired every minute. Is determined. Also, in the case of acquiring “minute” information as well, as in the case of acquiring TC for one frame as described above, TCs each having a time difference of one minute are acquired continuously a predetermined number of times. If it is determined that the standard radio wave has been successfully received. Such determination conditions can be changed as appropriate.

If the success / failure determination unit 465 determines that the success / failure determination unit 465 determines that the second trial determination unit 466 determines that the maximum number of times has been reached, the number of trials has reached the maximum value set by the maximum value setting unit 462. Whether or not (step S7). In step S7, it is determined whether or not the number of trials has reached the maximum value in a state where the standard radio wave reception process cannot be properly performed, and the reception process is repeated, resulting in an increase in power consumption. This is to prevent this.
If the second trial determination unit 466 determines that the number of trials has not reached the maximum value, the counter indicating the number of trials is incremented by one, and then the reception control process returns to step S4 for reception. Under the control of the control unit 463, the standard radio wave reception process is continued.
On the other hand, when the second trial determination unit 466 determines that the number of trials has reached the maximum value, the reception control unit 463 stops the reception process of the standard radio wave and ends the reception control process. In this case, the internal time is not corrected and the acquired TC is not stored. When the reception control process is terminated without correcting the internal time, the drive control unit 45 may notify the user to that effect by the display unit 6.

If the success / failure determination unit 465 determines that the success is determined in the determination process in step S <b> 6, the main control unit 46 causes the time correction unit 44 to correct the internal time based on the TC input from the TCO decoding unit 41. (Step S8). The acquired TC is stored in the storage unit 42.
After step S8, the reception control unit 463 stops the reception process of the standard radio wave, and the reception control process ends.

[Effect of the embodiment]
The radio-controlled timepiece 1 according to the present embodiment described above has the following effects.
When the TC (time information) corresponding to the standard radio wave to be received is not stored by the maximum value setting unit 462, the standard radio wave when the TC is stored is used as the maximum value of the number of times the standard radio wave is received. A value larger than the maximum value of the number of receptions is set. According to this, by increasing the number of times of reception of the standard radio wave, the success probability of the standard radio wave reception process can be increased, and the probability that the time information is appropriately acquired can be increased. Therefore, when TC is not stored and it is necessary to acquire TC for one frame, the TC can be acquired appropriately, and the internal time can be corrected reliably and appropriately.

  On the other hand, when the TC corresponding to the standard radio wave to be received is already stored, if specific information (for example, “minute” and “second” information) in the TC for one frame can be acquired, the internal time is corrected. Can be implemented. When this specific information is acquired, the error occurrence probability (probability of acquiring incorrect information) is lower than when all the time information for one frame is acquired. For this reason, even if the maximum number of times of reception of the standard radio wave is small, the specific information can be acquired and the internal time can be corrected. In this case, since the number of receptions is small, power consumption can be reduced.

  Further, since the maximum value of the number of receptions is set in each of the cases where TC is not stored and stored, the number of trials is received when the state where the reception of the standard radio wave and the acquisition of time information are not successful continues. When reaches the maximum value, the reception process of the standard radio wave is stopped. Therefore, it is possible to suppress the wasteful power consumption by continuously executing the reception process in a situation where the standard radio wave cannot be received.

  If the success / failure determination unit 465 determines that the reception of the standard radio wave is successful, the reception control unit 463 terminates the reception process by the antenna 2 and the reception circuit 3. According to this, even when the number of times of reception of the standard radio wave does not reach the maximum value, the reception process of the standard radio wave can be terminated if the TC is appropriately acquired. Therefore, unnecessary power consumption can be suppressed.

[Modification of Embodiment]
The present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In the embodiment, the success / failure determination unit 465 determines whether or not the reception process of the standard radio wave has succeeded by determining whether or not the acquired TC is appropriate data after the number of trials reaches a predetermined value. However, the present invention is not limited to this. That is, it may be configured to determine whether or not the reception process is successful every time the standard radio wave is received for a period corresponding to one minute. In this case, it is good also as a structure which compares the acquired TC with the internal time currently timed by the time measuring part 43, and determines whether the said TC is appropriate. In addition, the configuration may be such that the standard radio wave reception process is executed until the number of receptions reaches the maximum value without providing the success / failure determination unit 465.

  In the embodiment, if the TC is stored in the past by receiving a standard radio wave, the maximum value of the number of trials is set to a small value, and if the TC is not stored, the maximum value of the number of trials is set to a large value. Then. In addition to this, for example, when the acquisition date of the stored TC is old (for example, when the acquisition date is one month or one year ago), it is assumed that the TC is not stored, and the maximum number of trials A value may be set.

  In the embodiment, the standard radio wave reception process is repeatedly executed until it is determined that the standard radio wave reception is successful within a range where the number of trials does not exceed the maximum value, but the present invention is not limited to this. Absent. For example, when acquiring specific information among time information, it is good also as a structure which receives a standard radio wave only in the period when the said specific information is transmitted. For example, when “second” information is acquired as the specific information, a standard radio wave reception process is executed and a marker indicating the timing of “0” seconds is acquired. The process may be terminated.

  In the embodiment, the TC determination unit 461 refers to the storage unit 42 to determine whether or not the TC is stored in the storage unit 42, but the present invention is not limited thereto. For example, it may be configured to determine whether or not the TC is stored by referring to a flag or the like that is set when the TC is stored.

In the embodiment, the receiving circuit 3 is configured as a superheterodyne receiving circuit, but the present invention is not limited to this. For example, it may be configured as a straight receiving circuit that does not convert the frequency of the received signal.
In the above-described embodiment, the main control unit 46 and the receiving circuit 3 are connected via a serial communication line. However, two-wire communication is possible between the main control unit 46 and the receiving circuit 3. It may be configured to perform bidirectional serial communication using the synchronous interface. In such a case, the receiving circuit 3 to which the control signal is input from the main control unit 46 may transfer (feedback) the received and recognized control signal to the main control unit 46 again. According to this, the main control part 46 can implement serial communication with higher reliability by confirming the difference between the output control signal and the input control signal.

  DESCRIPTION OF SYMBOLS 1 ... Radio wave correction clock, 2 ... Antenna (reception means), 3 ... Reception circuit (reception means), 4 ... Control circuit (control means), 6 ... Display means, 42 ... Memory | storage part (storage means), 44 ... Time correction Unit (time correction unit), 46... Main control unit (control unit), 463... Reception control unit, 465.

Claims (2)

A receiving means for receiving a standard radio wave;
Time correcting means for correcting the internal time based on time information included in the standard radio wave received by the receiving means;
Storage means for storing the time information;
Display means for displaying the internal time;
Control means for controlling the receiving means,
The control means includes
When receiving the standard radio wave,
When the time information is stored in the storage means, the maximum value of the number of times of reception, which is the number of times of receiving the standard radio wave and acquiring the time information transmitted every frame, is set to the first number of times. Set,
If the time information is not stored, a maximum value setting unit that sets the maximum value of the number of receptions to a second number greater than the first number ;
A success / failure determination unit for determining success / failure of reception of the standard radio wave by the reception means;
When it is determined that the reception of the standard radio wave is successful, the reception process by the receiving unit is terminated,
When it is determined that the reception of the standard radio wave is unsuccessful, if the number of receptions has not reached the maximum value, the reception process by the receiving unit is continued, and the number of receptions has reached the maximum value, A radio control timepiece comprising: a reception control unit that terminates reception processing by the reception unit . A control method for a radio-controlled timepiece that receives a standard radio wave including time information and corrects the internal time based on the time information,
When receiving the standard radio wave,
If the time information is stored, the standard radio wave is received, the maximum number of reception times that is the number of times to acquire the time information transmitted every frame is set to the first number of times,
If the time information is not stored, setting the maximum number of receptions to a second number greater than the first number ;
Determining the success or failure of receiving the standard radio wave;
When it is determined that the reception of the standard radio wave is successful, the reception process is terminated,
If it is determined that reception of the standard radio wave is unsuccessful, if the number of receptions has not reached the maximum value, the reception process is continued, and if the number of receptions has reached the maximum value, the reception process is terminated. And a step of controlling the radio-controlled timepiece.

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