JP3459771B2 - Time information receiving device and clock with time correction function - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time information receiving device and a timepiece with a time adjustment function.

[0002]

2. Description of the Related Art Conventionally, there is a radio-controlled timepiece that detects an hour signal from a time signal of an FM radio or the like and adjusts the display time of a time display section based on the detected hour signal.

As shown in FIG. 4, a timepiece of this type generally comprises hands 101a, 101b and the like, a time display section 101 for displaying the current time, an hour signal reception unit 102 for detecting an hour signal, and a time display section. The display drive unit 1 that operates 101 and corrects the display of the time display unit 101 based on the hour signal detected by the hour signal reception unit 102.
It is composed of 03 etc.

To briefly explain FIG. 4, the display driving section 10
The internal clock 111 includes a CPU, a ROM, a RAM, and the like.
The control circuit 111 has a, a crystal oscillator 112 that outputs a reference clock signal, a clock driver 113 that outputs a hand movement signal to the time display unit 101, and the like. Control circuit 1
11 indicates a time (30 seconds) just before the internal clock 111a measures the hour.
An hour signal detection request signal (hereinafter referred to as "correction request signal") is output from about a second before and the hour signal reception unit 10 is output.
2 is operated. The hour signal receiving unit 102 includes an antenna 114, an FM radio receiver 115, and a time signal detector 11.
6 and the like, the operation is started by the correction request signal from the display drive unit 103, and when the hour signal is detected, the hour signal is output to the display drive unit 103 as a correction (synchronization) signal.

That is, in the case of FIG. 4, the display driver 103
Outputs a correction request signal shortly before the internal clock 111a of the control circuit 111 measures the hour, and corrects the time based on the correction (synchronization) signal output from the hour signal receiving unit 102 indicating the hour. It is a thing.

Further, unlike the above, a long wave standard for receiving a time code signal (long wave standard radio wave) having one data frame for one minute and correcting the display time of the time display unit based on the received signal. In recent years, radio-controlled timepieces that use radio waves have rapidly become popular.

This type of timepiece has a pointer 2 as shown in FIG.
01a, 201b, etc., a time display unit 201 for displaying the current time, a time code signal receiving unit 202 for detecting the time code signal, and a time code signal detected by the time code signal receiving unit 202 while operating the time display unit 201. The display drive unit 203 for correcting the display of the time display unit 201 based on

Referring to FIG. 5, the display drive unit 203 has a C
A control circuit 211 having a PU, a ROM, a RAM and having an internal clock, and a crystal oscillator 21 for outputting a reference clock signal.
2 and a clock driver 213 that outputs a hand movement signal to the time display unit 201. The control circuit 211 outputs the time code signal detection request signal a few minutes before the internal clock measures the hour (about 5 minutes before), and operates the time code signal receiving unit 202. Time code signal receiving unit 20
2 includes an antenna 214, a long wave receiver 215 that receives a time code signal, a decoding control circuit 216, and the like,
The operation is started by the time code signal detection request signal from the display drive unit 203, and when the time data is detected, the time data is output to the display drive unit 103.

That is, in the case of FIG. 5, the display drive unit 203
Is for outputting a time code signal detection request signal a few minutes before the internal clock of the control circuit 211 measures the hour, and correcting the time based on the time data output from the time code signal receiving unit 202.

In this case, since the time code signal is continuously transmitted every minute, even if a noise of 1 or 2 seconds suddenly occurs during reception, if the reception is continued for several minutes, the time can be surely obtained. Can detect data.

[0011]

The former is already installed in various places as an equipment clock, but it has a problem that it may malfunction due to noise or the like when a time signal is generated. Further, when the time signal cannot be detected due to noise or the like when the time signal is generated, there is a disadvantage that it is necessary to wait several hours to detect the next time signal. That is, there was a problem with the time signal reception system.

Therefore, it is conceivable to use the latter time code signal receiving unit 202 having high reception accuracy as the former receiving unit already installed, but as described above, the signals output from the display driving units 103 and 203 are used. Cannot be simply replaced because they are not the same. More specifically, since the former signal from the display drive unit 103 for instructing the start of the operation of the receiving system is slightly before the hour, it is not possible to operate the latter time code signal receiving unit 202 with this signal. There arises a problem that it becomes impossible to receive a time code signal including time information in which one minute corresponds to one frame.

To solve this problem, the time code signal receiving unit 202 may be operated at all times, but in this case, there is a problem that power consumption increases.

[0014]

According to the present invention, a time code signal is detected after a desired time has elapsed after a control means inputs a correction request signal from the outside, and time information is obtained. When the detection operation is stopped and the timekeeping time of the timekeeping means is corrected based on the time information obtained from the timecode signal, and the next correction request signal is input from the outside, the timekeeping time of the corrected timekeeping means is used. To output the hour signal. Therefore, the hour signal can be output based on the time information obtained from the time code signal when the correction request signal is input. Therefore, it is possible to solve the problems of erroneous correction due to erroneous detection of time signals, sudden unreceivability and hence uncorrectable, and operational stability reliability due to general broadcast waves. Further, since the time code signal is not always detected, power saving can be achieved.

The control means, the counter means for starting counting after the correction request signal is inputted, and the judgment for outputting the arrival signal when the count value of the counter means reaches the value corresponding to the desired time. Means and a stop mode until the determination means outputs the arrival signal, and when the arrival signal is output, the time code signal detection means is operated, and time information is detected based on the detected time code signal. When the operation of the time code signal detection means is stopped after obtaining, the time measurement time of the time measurement means is corrected based on the time information obtained from the time code signal, and the next correction request signal is input from the outside. In addition to the above effect, further power saving is achieved because the control circuit that outputs the hour signal based on the time measured by the corrected time measuring means is included. Achieved.

Since the desired time is changed according to the length of time from when the operation of the time code signal detecting means is stopped until the next correction request signal is input from the outside,
For example, if the reception condition is good and the time required to obtain the time information is short, the desired time is lengthened to shorten the time from obtaining the time information to outputting the hour signal to reduce the accuracy of the time information to noise. If the reception condition is bad and the time is long, the desired time can be shortened to lengthen the time code signal detection operation, and the time information can be reliably obtained. Can be done.

The control means detects the time code signal in response to the input of the correction request signal and outputs the hour signal based on the time measured by the time counting circuit. After the output of the hour signal is completed, the detected time code signal is detected. The time information is obtained from the time code signal detection operation, and then the time code signal detection operation is stopped, and the time measured by the time measuring means is corrected based on the time information obtained from the time code signal. Counting is not required, so operation can be simplified and power consumption can be saved.

Further, the time information receiving device as described above displays the current time, outputs a correction request signal at a desired time, and corrects the time by the hour signal, that is, a conventional radio time signal or the like. By using it in combination with the time display unit that has corrected the display time by the hour signal, the same effect as above can be obtained, and the display time is corrected by the time signal (hour signal) by the conventional radio wave. The time of the time display section can be adjusted using the time information receiving device as described above. Therefore, the time display unit already installed can be used as it is, and the time can be adjusted with high accuracy.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present application comprises a time code signal detecting means for detecting a time code signal, and a time measuring means for performing a time counting operation based on the time information obtained from the time code signal. The operation of the time code signal detection means after the time code signal detection means is operated from the time when a desired time elapses after the correction request signal from the outside is input and the time information is obtained based on the detected time code signal Stop, corrects the time measured by the time measuring means based on the time information obtained from the time code signal, and when the next correction request signal is input from the outside, the time measured by the time measuring means is corrected. And a control means for outputting an hourly signal based on the hour.

In the invention according to claim 2 of the present application, the control means is provided with counter means for starting counting after the correction request signal is input, and the count value of the counter means is set to a value corresponding to the desired time. When the arrival signal is reached, the determination means outputs an arrival signal, and until the determination means outputs the arrival signal, the stop mode is set, and when the arrival signal is output, the time code signal detection means is operated, After obtaining the time information based on the detected time code signal, the operation of the time code signal detecting means is stopped, and the time measured by the time measuring means is corrected based on the time information obtained from the time code signal. When a next correction request signal is input from the outside, the control circuit outputs a hour signal based on the corrected time measured by the time measuring means.

In the invention according to claim 3 of the present application, the desired time is changed in accordance with the time required from the time the previous time code signal detecting means was operated until the time information was obtained.

In the invention according to claim 4 of the present application, a time code signal detecting means for detecting a time code signal, a time measuring means for performing a time counting operation based on the time information obtained from the time code signal, and an external The time code signal detecting means is operated in response to the input of the correction request signal, and the hour signal is output based on the time counted by the time counting circuit, and the time is detected from the detected time code signal after the output of the hour signal is completed. Control means for acquiring information, thereafter stopping the operation of the time code signal detecting means, and correcting the time measured by the time measuring means based on the time information obtained from the time code signal.

The invention according to claim 5 of the present application displays the current time, outputs a correction request signal at a desired time, and
A time display section for adjusting the time by the hour signal, a time code signal detecting means for detecting the time code signal, a time measuring means for performing a time counting operation based on the time information obtained from the time code signal, and the correction request. The time code signal detection means is operated from the time when a desired time has elapsed after the signal is output, and after the time information is obtained based on the detected time code signal, the operation of the time code signal detection means is stopped and the time is The time measured by the time measuring means is corrected based on the time information obtained from the code signal, and when the next correction request signal is output from the time display section, the time is calculated based on the time measured by the corrected time measuring means. The display unit is provided with control means for outputting an hour signal.

In the invention according to claim 6 of the present application, the control means is provided with counter means for starting counting after the correction request signal is input, and the count value of the counter means is set to a value corresponding to the desired time. When the arrival signal is reached, the determination means outputs an arrival signal, and until the determination means outputs the arrival signal, the stop mode is set, and when the arrival signal is output, the time code signal detection means is operated, After obtaining the time information based on the detected time code signal, the operation of the time code signal detecting means is stopped, and the time measured by the time measuring means is corrected based on the time information obtained from the time code signal. When the correction request signal is input, a control circuit for outputting an hour signal based on the time measured by the corrected time measuring means is included.

In the invention according to claim 7 of the present application, the desired time is changed according to the time required from the time the previous time code signal detecting means was operated until the time information was obtained.

The invention according to claim 8 of the present application displays the current time, outputs a correction request signal at a desired time, and
A time display section for adjusting the time by the hour signal, a time code signal detecting means for detecting the time code signal, a time measuring means for performing a time counting operation based on the time information obtained from the time code signal, and the correction request. The time code signal detecting means is operated according to the output of the signal, and the hour signal is output to the time display section based on the time counted by the time counting circuit, and the time code detected after the output of the hour signal is completed. Control means for acquiring time information from the signal, thereafter stopping the operation of the time code signal detecting means, and correcting the time measured by the time measuring means based on the time information obtained from the time code signal. .

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a time information receiving device 1 comprises an antenna 214, a long wave receiver 215, a power supply control circuit 2 for controlling the power supply of the long wave receiver 215, a crystal oscillator 3 for outputting a 1-second clock signal, and a CPU. The control circuit 4 includes a ROM, a RAM, etc., and controls various operations. The antenna 214 and the longwave receiver 215 form a time code signal detecting means. The control circuit 4 is provided with an internal clock 4a and a timer 4b forming a time measuring means in its internal RAM,
The count is updated using the 1-second clock signal output from the crystal oscillator 3 as an interrupt signal. The power supply control circuit 2, the crystal oscillator 3, and the control circuit 4 constitute control means. The same parts as those shown in FIGS. 4 and 5 are designated by the same reference numerals. That is, in this example, the time display section,
As the display drive unit, the one having the structure of correcting the time based on the conventional hour signal is used as it is. The time display unit 101 and the display drive unit 103 form a time display unit.

Next, the operation will be described with reference to FIG. Here, an example in which the time is corrected using the time signal of 7:00 am will be described. Note that a time signal other than 7:00 am may be used. In addition, it is assumed that all the circuits in the time information receiving device 1 are in the initial state immediately after the power is turned on or reset.

During normal hand movement, the control circuit 111 in the display drive unit 103 updates the time of the internal clock 111a based on the output of the crystal oscillator 112, and outputs a pulse to the clock driver 113 every 30 seconds. Clock driver 113
Outputs a hand movement signal to the time display unit 101 based on this pulse, and updates the display of the time display unit 101 for 30 seconds.

When the time measured by the internal clock 111a in the control circuit 111 is 6:59:45 am (step 2)
a), the control circuit 111 outputs a correction request signal to the time information receiving device 1 (step 2b). That is, the correction request signal is output to the time information receiving device 1 15 seconds before the correction time.

The control circuit 4 in the time information receiving device 1 in the initial state starts the timer 4b therein in response to the correction request signal input from the display drive section 103 (step 2c).

The control circuit 4 updates the count of the timer 4b by using the 1-second clock signal output from the crystal oscillator 3 as an interrupt signal, and when the count value reaches a value corresponding to 23 hours 55 minutes, that is, the display drive section. The clock time of the internal clock 111a in 103 is 6:54 am 4 of the next day.
At 5 seconds (step 2d), the long-wave receiver 215 is operated to receive and decode the time code signal, the time information is detected from the time code signal, and the inside of the time information receiving apparatus 1 is based on the detected time. The clocked time of the clock 4a and the generation timing of the 1-second clock signal of the crystal oscillator 3 are corrected (steps 2e, 2f, 2g).

If the count value has not reached the value corresponding to 23 hours and 55 minutes when the timer 4b updates the count, the control circuit 4 immediately enters the HALT mode (stop mode) and consumes power. Is suppressed (step 2h).

After correcting the clocked time of the internal clock 4a and the generation timing of the 1-second clock signal of the crystal oscillator 3 based on the time information detected from the time code signal,
The operation of the longwave receiver 215 is stopped (step 2i) to save power, and the control circuit 4 stores the count value of the timer 4b at this time in its internal RAM (step 2j).

In such a state, that is, in a state in which the clock time of the internal clock 4a in the time information receiving device 1 is corrected based on the time information detected from the time code signal, the clock of the internal clock 111a in the display drive unit 103 is measured. Time is 6 am again
When the time reaches 59:45 and the display drive unit 103 outputs the correction request signal again (step 2k), the control circuit 4 stores the count value of the timer 4b at this time in the RAM therein (step 2m), After that, the timer 4b is reset, and the count is updated again by using the 1-second clock signal output from the crystal oscillator 3 as an interrupt signal (step 2).
n).

The time information receiving device 1 outputs the hour signal to the display drive unit 103 when the time counted by the internal clock 4a first reaches the hour after the correction request signal is output (step 2p). The display drive unit 103 corrects the display time according to the hour signal. That is, the internal clock 111 in the display drive unit 103 is based on the clocked time of the internal clock 4a corrected based on the time information detected from the time code signal.
Correct the time measured in a. This has the same effect as correcting the clocked time of the internal clock 111a in the display drive unit 103 based on the time information detected from the time code signal, and accurate time correction can be performed. Therefore, it is possible to solve the problems of erroneous correction due to erroneous detection of the time signal, sudden reception failure and further correction, and reliability of operational stability due to general broadcast waves. The time display of the time display unit 101 is corrected by the correction of the internal clock 111a.

When the hour signal output is completed (step 2
p), the control circuit 4 compares the count value of the timer 4b when the operation of the longwave receiver 215 is stopped with the count value of the timer 4b when the correction request signal is output, and the difference is 1 minute or more. If so (step 2q), the operation start timing of the next long-wave receiver 215 is delayed by 1 minute (step 2r). Conversely, when the correction request signal is output while the longwave receiver 215 is operating, the longwave receiver 215
And the operation start timing of the long-wave receiver 215 is advanced by 1 minute, for example, within 30 minutes.
In this way, if the reception state is good and the time required to obtain the time information is short, the desired time is lengthened to shorten the time from obtaining the time information to outputting the hour signal to reduce the time information. Prevents deterioration of the accuracy of the hour signal by shortening the period when accuracy is disturbed by noise, etc., and conversely, if the reception condition is bad and the time is long, shorten the desired time and lengthen the time code signal detection operation. , It is possible to surely get the time information.

As described above, the time can be corrected on the time display section, which was corrected by the hour signal such as the conventional radio time signal, based on the time information obtained from the time code signal. Therefore, the time display unit already installed can be used as it is, and the time can be adjusted with high accuracy.

In the above example, the operation start timing of the long wave receiver 215 in the time information receiving apparatus 1 is defined based on the count value of the timer 4b. However, the operation of the long wave receiver 215 when the correction request signal is generated. May be started. In this case, the internal clock 4a in the time information receiver 1 is based on the time information obtained from the longwave receiver 215.
When the clocked time of is corrected and the next correction request signal occurs,
The display drive unit 103 is based on the time measured by the internal clock 4a.
The clock time of the internal clock 111a is corrected. After this correction, the long wave receiver 215 is operated again to correct the clock time of the internal clock 4a in the time information receiving device 1. In this example, the timer 4b can be omitted, so that the configuration can be simplified.

The long-wave receiver 21 for detecting time information
5 may receive a time information medium other than the long wave standard radio wave, and the signal medium may be wired or wireless. Therefore,
For example, it may be one that detects time information from a telephone line.

Further, the time display unit 101 may be provided with a mechanical contact driven by a cam or the like, and a signal output according to opening / closing of this contact may be used as the correction request signal.

Further, as shown in FIG. 3, a counter circuit (constituting counter means) 5 for counting the output of the crystal oscillator 3 instead of the timer 4b and a count value of the counter circuit 5 are set to desired values. A condition judgment circuit 6 (which constitutes judgment means) including a comparison circuit for comparison may be provided. To explain the operation in this case, the counter circuit 5 is operated by the input of the correction request signal, and the condition judging circuit 6 causes the count value of the counter circuit 5 to reach a desired value (for example, a value corresponding to 23 hours 55 minutes). Longwave receiver 21
A signal for operating 5 (constituting a reaching signal) is output to the control circuit 4. The control circuit 4 operates the long wave receiver 215 according to this output. After that, the same operation as in the above example is performed. In this case, the timer 4b in the control circuit 4
Can be omitted, the load on the control circuit 4 can be reduced. Further, since the control circuit 4 can be put in the stop mode until the condition judging circuit 6 produces an output, power saving can be achieved.

[0043]

According to the present invention, the time code signal detection operation is performed after the control means detects the time code signal from the time when a desired time has elapsed after the correction request signal from the outside is input and the time information is obtained. Stop the time, correct the time measured by the time measuring means based on the time information obtained from the time code signal, and when the next correction request signal is input from the outside, correct the time measured by the corrected time measuring means. Output the hour signal. Therefore, the hour signal can be output based on the time information obtained from the time code signal when the correction request signal is input. Therefore, it is possible to solve the problems of erroneous correction due to erroneous detection of time signals, sudden unreceivability and hence uncorrectable, and operational stability reliability due to general broadcast waves. Further, since the time code signal is not always detected, power saving can be achieved.

Counter means for starting counting after the correction request signal is inputted to the control means, and judgment to output an arrival signal when the count value of the counter means reaches a value corresponding to the desired time. Means and a stop mode until the determination means outputs the arrival signal, and when the arrival signal is output, the time code signal detection means is operated, and time information is detected based on the detected time code signal. When the operation of the time code signal detection means is stopped after obtaining, the time measurement time of the time measurement means is corrected based on the time information obtained from the time code signal, and the next correction request signal is input from the outside. In addition to the above effect, further power saving is achieved because the control circuit that outputs the hour signal based on the time measured by the corrected time measuring means is included. Achieved.

Since the desired time is changed according to the length of time from when the operation of the time code signal detecting means is stopped until the next correction request signal is input from the outside,
For example, if the reception condition is good and the time required to obtain the time information is short, the desired time is lengthened to shorten the time from obtaining the time information to outputting the hour signal to reduce the accuracy of the time information to noise. In order to prevent the deterioration of accuracy by shortening the period of time, the time code signal detection operation can be surely obtained by shortening the desired time if the reception condition is bad and the time is long. Can be done.

The control means detects the time code signal in response to the input of the correction request signal and outputs the hour signal based on the time measured by the time counting circuit. After the output of the hour signal is completed, the detected time code signal is detected. The time information is obtained from the time code signal detection operation, and then the time code signal detection operation is stopped, and the time measured by the time measuring means is corrected based on the time information obtained from the time code signal. Counting is not required, so operation can be simplified and power consumption can be saved.

Further, the time information receiving device as described above displays the current time, outputs a correction request signal at a desired time, and corrects the time by the hour signal, that is, a conventional radio time signal or the like. When used in combination with the time display unit that corrects the display time by the hour signal, the time effect of the time display unit that corrects the display time by the hour signal such as the conventional radio time signal is obtained while using the same effect as above. Can be performed using the time information receiving device as described above. Therefore, the time display unit already installed can be used as it is, and the time can be adjusted with high accuracy.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of FIG.

FIG. 3 is a block diagram showing another embodiment of the present invention.

FIG. 4 is a block diagram of a conventional timepiece with a time adjustment function.

FIG. 5 is a block diagram of a conventional timepiece with a time adjustment function.

[Explanation of symbols]

1 Time information receiver 215 time code signal detecting means 2, 3, 4 control means 4 control circuit 4a Timing means 5 Counter means 6 judgment means 101, 103 time display means

Claims (8)

(57) [Claims] 1. A time code signal detecting means for detecting a time code signal, a time measuring means for performing a time measuring operation based on the time information obtained from the time code signal, and after inputting a correction request signal from the outside. After the desired time has elapsed, the time code signal detecting means is operated, and after obtaining time information based on the detected time code signal, the operation of the time code signal detecting means is stopped, and the time code signal is obtained from the time code signal. When the timekeeping time of the timekeeping means is corrected based on the time information, and when the next correction request signal is input from the outside, there is provided a control means for outputting the hour signal based on the timekeeping time of the corrected timekeeping means. A time information receiving device characterized by being provided. 2. The control means according to claim 1, wherein the control means starts counting after the correction request signal is input, and when the count value of the counter means reaches a value corresponding to the desired time. And a determination means for outputting the arrival signal to the stop mode until the determination means outputs the arrival signal, and when the arrival signal is output, the time code signal detection means is operated to detect the time. After the time information is obtained based on the code signal, the operation of the time code signal detecting means is stopped, the time measured by the time measuring means is corrected based on the time information obtained from the time code signal, And a control circuit that outputs a hour signal based on the time measured by the corrected time measuring means when the correction request signal is input. Information receiving device. 3. The desired time period according to claim 1, wherein the desired time period changes according to the length of time from when the operation of the time code signal detecting means is stopped until the next correction request signal is input from the outside. A time information receiving device characterized by being a thing. 4. A time code signal detecting means for detecting the time code signal, a time measuring means for performing a time counting operation based on the time information obtained from the time code signal, and an input of a correction request signal from the outside. The hour code signal detecting means is operated and a hour signal is output based on the time counted by the time counting circuit, and time information is obtained from the detected time code signal after the output of the hour signal is completed. A time information receiving device comprising: a control means for stopping the operation of the code signal detecting means and correcting the time measured by the time measuring means based on the time information obtained from the time code signal. 5. A time display means for displaying a current time, outputting a correction request signal at a desired time, and correcting the time by an hour signal, a time code signal detecting means for detecting a time code signal, and the above time. Time measuring means for performing a time counting operation based on the time information obtained from the code signal, and the time code signal detecting means is operated from the time when a desired time has elapsed after the correction request signal is output, and the detected time code signal is added. The operation of the time code signal detecting means is stopped after the time information is obtained based on the time information, and the time measured by the time measuring means is corrected based on the time information obtained from the time code signal. When a correction request signal is output, a control means for outputting a hour signal to the time display means based on the time measured by the corrected time measurement means is provided. A clock with a time adjustment function. 6. The control means according to claim 5, wherein the control means starts counting after the correction request signal is input, and when the count value of the counter means reaches a value corresponding to the desired time. And a determination means for outputting the arrival signal to the stop mode until the determination means outputs the arrival signal, and when the arrival signal is output, the time code signal detection means is operated to detect the time. After the time information is obtained based on the code signal, the operation of the time code signal detecting means is stopped, and the time measured by the time measuring means is corrected based on the time information obtained from the time code signal. When a request signal is input,
A timepiece with a time adjustment function, comprising: a control circuit that outputs an hour signal based on the timed time of the corrected timekeeping means. 7. The desired time according to claim 5, wherein the desired time changes according to the length of time from when the operation of the time code signal detecting means is stopped until the next correction request signal is input. A clock with a time correction function characterized by being present. 8. A time display means for displaying a current time, outputting a correction request signal at a desired time, and correcting the time by an hour signal, a time code signal detecting means for detecting a time code signal, and the above time. Time measuring means for performing time counting operation based on time information obtained from the code signal, and operating the time code signal detecting means in response to the output of the correction request signal, and displaying the time based on the time measured by the time measuring circuit. The hour code signal is output to the section, the time information is obtained from the detected time code signal after the output of the hour signal, and then the operation of the time code signal detection means is stopped. And a control means for correcting the time measured by the time measuring means based on the time information.