JP3341178B2 - Time data receiving device - 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 data receiving apparatus generally called a radio clock.

[0002]

2. Description of the Related Art Currently, each country (eg, Germany, United Kingdom,
Switzerland, Japan, etc.), a time code, that is, a long-wave standard radio wave containing a time code is transmitted. JG in our country
A long-wave standard radio wave of 40 KHz amplitude-modulated by a time code having a format as shown in FIG. 4 is transmitted from 2AS (experimental station). The above Japan time code is
Each time the minute digit of the exact time is updated (ie, every minute), it is sent in a one-minute format. Then, as shown in FIG. 4, the one-minute frame has a rising edge at the start time, that is, the starting time of 0 second, and a pulse having a pulse width of 0.2 second is arranged. is also provided at the time of 9,19,29,39,49,59 seconds (in FIG. 4, it is shown at the P ₀ ~P _6). For this reason, almost 1
Of 0.2 second pulses width apart seconds two (i.e. those represented by those with P ₀ represented by P ₆₎ becomes that are arranged (recognize the start of a new frame by which it becomes possible), exact rise time of pulses shown that pulse to say that the frame reference marker (hence in the frame reference marker i.e. P ₀ of the later of the two pulses of the minute digit of the current time Update time). In the frame, the minute, hour, and accumulated date of the time at the start of the frame (the number of days since January 1)
Data of 1 second, 10 second and 30-4
In the 0s, they are arranged in binary coded decimal numbers. In this case, logics 1 and 0 are represented by pulses having pulse widths of 0.5 seconds and 0.8 seconds, respectively (as shown in FIG. 4). In addition, a pulse having a pulse width of 0.8 seconds, which is used as a mere delimiter, not as data, is also provided as appropriate.) In the frame shown in FIG. 4, data at 18:42 on the integration day 253 is displayed.

In recent years, radio timepieces that receive the above time code and correct the time data of the time counting circuit, that is, a time data receiving device, have been put to practical use. The above-mentioned correction operation of the time data receiving apparatus of this type is executed at predetermined time intervals.

[0004]

However, as described above, the conventional time data receiving apparatus receives the time code and corrects the current time data of the time counting circuit based on the time code. Is performed at predetermined intervals (for example, one hour). Therefore, even when the time data receiving device is left in a place where the radio wave receiving environment is poor, the radio wave cannot be sufficiently received, an accurate current reception time is obtained, and the correction operation cannot be performed with this. Attempts are made to perform the receiving operation at regular intervals, but the receiving operation requires a relatively large amount of power and has a problem in terms of effective use of power. The present invention has been made in view of the circumstances described above, and even when the radio wave reception environment is poor and a long-wave standard radio wave containing a time code cannot be received, wasteful operations are repeated by repeating this operation for every predetermined time. It is an object of the present invention to provide a time data receiving device capable of avoiding excessive power consumption.

[0005]

According to the first aspect of the present invention, time counting means for obtaining time data by counting a reference clock signal and receiving time data by receiving a standard radio wave including a time code at predetermined intervals. Receiving means; determining means for determining whether accurate receiving time data is obtained by the receiving means; and time data of the time counting means when the determining means determines that accurate receiving time data is obtained. Means for correcting the received time data obtained by the receiving means, and stopping the receiving operation of the receiving means at the predetermined intervals when the determining means determines that accurate received data cannot be obtained. Receiving operation stopping means, detecting means for detecting that the apparatus has been moved, and when the receiving operation of the receiving means has been stopped by the receiving operation stopping means, the apparatus is operated by the detecting means. It was was so and a first resuming means for resuming the reception operation of the reception means when it is detected. According to a second aspect of the present invention, in addition to the first aspect, an external operation switch operation detecting means for detecting that an external operation switch has been operated, and the receiving operation of the receiving means is stopped by the receiving operation stopping means. A second resuming means for resuming the receiving operation of the receiving means when the operation of the external operating switch is detected by the external operation switch operation detecting means.

[0006]

According to the first aspect of the present invention, when the time data receiving device is left in a poor receiving environment and cannot receive the time code-added long wave standard radio wave, the fact is determined by the determining means, and the receiving operation stopping means is determined. The receiving operation is stopped, and thereafter, when there is a possibility that the time data receiving device has been moved to a place having a good receiving environment, this is detected by the detecting means, and the first resuming means restarts the reception. According to the second aspect of the present invention, the first resuming means not only resumes reception as described above, but also when the external operation switch operation detecting means detects the operation of the external operation switch, the second resuming operation is performed in response to the detection. Means resume reception.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to an embodiment shown in the drawings. FIG. 1 shows a circuit configuration of the present embodiment. That is, the present embodiment has a configuration in which another circuit unit is connected to the CPU 1 as a center.
Is a circuit unit that processes and processes the transmitted data, sends it out, sends a control signal to a connected circuit unit, and controls them. The antenna 2 is a circuit unit that receives a transmitted radio wave, converts it into a corresponding electric signal, and transmits the electric signal to the receiving circuit 3. The receiving circuit 3 is activated by receiving a reception start / end signal C from the CPU 1, selects a signal of a specific frequency from the electric signal from the antenna 2, obtains the time code, that is, the time code TC from the signal, and receives
This is a superheterodyne type receiving circuit which sends out the signal to the PU 1 and then stops the operation upon receiving the reception start / end signal C. That is, the receiving circuit 3 includes a tuning circuit for extracting the specific frequency signal from the electric signal from the antenna 2, a high-frequency amplifier circuit for amplifying the extracted specific frequency signal, a PLL frequency synthesizer used as a local oscillator, A mixer that mixes the signal amplified by the high frequency amplifier circuit with the signal from the PLL frequency synthesizer, a band-pass filter that extracts a desired intermediate frequency signal from the signal from the mixer, and a signal that is extracted by the band-pass filter A detection circuit for obtaining a baseband signal from the intermediate frequency signal; converting the baseband signal obtained by the detection circuit into a digital signal;
And an A / D conversion circuit for sending to the PU1.

The oscillating circuit 5 is a circuit section that constantly sends out a signal of a constant frequency.
When the count signal reaches a value corresponding to one minute, a one-minute signal M is sent to the clock circuit 7 and the count value is decremented by one each time the preset signal P from the CPU 1 is received. This is a circuit unit that increases the size by a fraction of a second. The clock counting circuit 7 counts the one-minute signal M from the frequency dividing circuit 6 to obtain current time data, that is, date data of the current day and present time data and minute data, and supplies them to the CPU 1 and also provides the CPU 1 This is a circuit section for correcting the current time data counted by the time data from.

The switch section 8 is a circuit section having various switches and transmitting a corresponding switch input signal to the CPU 1 when any one of them is operated. The RAM 9 includes various registers described below, and is a circuit unit that stores data from the CPU 1 under the control of the CPU 1 and sends the stored data to the CPU 1. The acceleration sensor 10 is a circuit unit that detects an acceleration when the time data receiving device is moved and sends a corresponding detection output to the CPU 1. The display unit 11 is a circuit unit that digitally displays data from the CPU 1, for example, current time data by the clock circuit 7, and the like.

Next, various registers provided in the RAM 9 will be described. Reception time memories X1 to X3
In the one time correction operation, that is, in the radio wave correction process (step S7 in FIG. 2) described later, the time code TC is received three times continuously every one minute, and the reception time data extracted therefrom is respectively The reception integrated date memories D1 to D3 are stored in the reception time memory X.
Date data obtained by converting the integrated date data sent together with the reception time data stored in 1 to X3 are memories respectively stored. The current reception time memory X is stored in the reception time memory X3. A memory for storing time data one minute later than the reception time data;
In addition, the reception current accumulation date memory D is the reception accumulation date memory D described above.
3 is a memory in which the date data stored in the memory 3 is stored. The non-reception flag _FNG is a flag register that is set to 1 when normal reception was not possible during the current radio wave correction processing, even though the reception was successful during the previous radio wave correction processing. Impossible count register NC
Is a register that counts from the radio wave correction processing when the reception impossible flag _FNG is set to 1 to the radio wave correction processing of what time, and whether or not the reception has not been normally performed.
Further, the reception stop flag F _K cannot be normally received even in the radio wave correction processing after the value of the above-mentioned unreceivable number register NC becomes 3, ie, it cannot be normally received four times continuously, This flag register is set to 1 when the receiving device is presumed to be left in a poor receiving environment to stop the subsequent receiving operation.

The operation of the embodiment constructed as described above will be described below. FIG. 2 is a general flowchart showing an outline of the operation of the present embodiment, and FIG. 3 is a flowchart showing the details of the radio wave correction processing in step S7 in FIG. Hereinafter, operations in various states will be described separately. (1) Operation in a Good Reception Environment First, an operation in a case where the time data receiving device is continuously in a good reception environment will be described. In this case, first, it is determined whether or not there is a switch input by operating any switch of the switch unit 8 in step S1. If there is a switch input, the process proceeds to step S2, where it is determined whether the value of the reception stop flag F _K is 1, that is, whether the stop of the execution of the radio wave correction process has been instructed. value of the reception stop flag F _K because it is when the data receiving apparatus is present a good place of continuously receiving environment is 0 rather than 1, the process proceeds to step S4, the switch processes corresponding to the switch input Execute. If the switch processing in step S4 has been completed, or if it has been determined in step S1 that no switch input has been made, the flow advances to step S5 to determine whether the value of the reception stop flag F _K is 0. Since the value of the reception stop flag F _K is 0 as shown in FIG.
, The current count time of the clock circuit 7 is an hour (time when the digit below the minute is 0, ie, 0, 1, 2, 3,..., 23,
24 hours). If the time is positive, the process proceeds to step S7, that is, the radio wave correction process in FIG. When this process is entered, first, in step S20
Then, the reception start / end signal C is sent to the reception circuit 3 to activate the reception circuit 3 to start the reception operation, and the time code TC transmitted from the reception circuit 3 by the reception operation of the reception circuit 3 is transmitted. I will take in. Then, in the next step S21, the transmitted time code TC is transmitted.
It checks whether there is the frame reference marker in it and repeats the operation until a frame reference marker is sent. When the frame reference marker is found, the process proceeds from step S21 to step S22, where the reception time data (that is, the minute and hour data) and the reception integration date are obtained from the time code TC transmitted subsequently to the frame reference marker. The data is extracted, and in the next step S23, the reception time data is stored in the reception time memory X of the RAM 9.
1 and then proceed to step S24 to convert the above-mentioned integrated reception date data into date data (data of months and days), and store the obtained date data in the integrated reception date memory D1 of the RAM 9. . Next, in step S25, a display process of digitally displaying the current time data and the like of the clock counting circuit 7 on the display unit 11 is executed, and then, in step S26.
Proceed to. In step S26, after the reception start / end signal C is sent to the reception circuit 3 this time and the reception is started, the frame reference marker (sent every minute as described above) is still detected three times. It is determined that the reception time data has not been extracted (that is, extraction of three kinds of reception time data different by one minute has not been completed), and the process returns to step S21.

As described above, after returning to step S21, in step S21, the frame reference marker (hereinafter referred to as the first frame reference marker) transmitted after the frame reference marker (hereinafter, referred to as the first frame reference marker). After the frame reference marker has been sent, it is a frame reference marker sent after one minute has passed.
(Referred to as a second frame reference marker) in the time code TC sent one after another. Then, when the second frame reference marker is found, step S22
Proceed to. In step S22, reception time data and reception integration date data are extracted from the time code TC following the second frame reference marker, and in step S23, the reception time data is stored in the reception time memory X.
2 and then proceeds to step S24 to convert the above-mentioned received integrated date data into date data and store it in the received integrated date memory D2. Thereafter, in step S25, the current time data and the like of the clock circuit 7 are displayed on the display section 11, and the process proceeds to step S26. It is determined that the operation has not been performed three times, and the process returns to step S21.

After returning to step S21 as described above, in step S21, frame reference markers (hereinafter, referred to as third frame reference markers) transmitted next to the second frame reference markers are successively transmitted. Search from the time code TC that comes. When the third frame reference marker is found, step S
Then, the process proceeds from step 21 to step S22, in which the reception time data and the integrated reception date data are extracted from the time code TC following the third frame reference marker. In the subsequent step S23, the reception time data is stored in the reception time memory X3. In step S24, the reception integrated date data is converted into date data and then stored in the reception integrated date memory D3.
Thereafter, in step S25, the current time data and the like of the clock circuit 7 are displayed on the display unit 11, and the process proceeds to step S26, where the detection of the frame reference marker has already been performed three times since the start of the current reception operation. And the process proceeds to step S27.

When the process proceeds to step S27 as described above, it is determined in this step whether the reception has been normally performed in the current radio wave correction process. That is, the data obtained by the current reception is significant, and the three reception time data stored in the reception time memories X1 to X3 are sequentially delayed by one minute, and It is determined whether the three date data stored in the reception integrated date memories D1 to D3 are the same. In this case, the reception environment is good and the reception is performed normally, and the fact is determined, and the process proceeds to step S40. Step value of the reception stop flag F _K step S40 is 0, as described above, it is determined that it is not a 1, the process proceeds to step S42, the value of this at step S42 unreceivable count register NC leave with 0, subsequent step In S43, the time data obtained by adding one minute to the reception time data stored in the reception time memory X3 is stored in the current reception time memory X (the time data obtained by adding one minute in this way is stored in the current reception time memory X). The reason for this is that, as described below, after the third frame reference marker has been sent, the frame reference marker sent when one minute elapses, that is, the fourth frame reference marker, is waited for. This is because the operation of correcting the current time data of the numerical circuit 7 is performed.)

After the processing of step S43 is completed, the date data of the reception integration date memory D3 is stored in the reception integration date memory D in step S44, and in the subsequent step S45, the fourth frame reference marker is stored. However, when the fourth frame reference marker is detected, the process proceeds to step S46. In step S46, one time from the rising time of the fourth frame reference marker.
The rising edge of the pulse rising at the point in time when
In waiting for the time) represented by T _1, when detecting the rising proceeds to step S47. In this step S47, the time data stored in the current reception time memory X (as described above, this is the time data at the time of the rising edge of the fourth frame reference marker, so the current Time data) and the reception date data stored in the reception current accumulation date memory D are forcibly set in the clock circuit 7 as current time data. In the following step S48, in step S4
Since the current time data set in the clock counting circuit 7 at 7 is one second older than the current time, that is, a time delayed from the current time as described above, the following 1
A preset signal P is supplied to the frequency dividing circuit 6 so that the minute signal M is transmitted after 59 seconds instead of 60 seconds, and the count value of the frequency dividing circuit 6 is forcibly increased by a count value corresponding to 1 second. And keep it. Step S4 as described above
After completing the process of step 8, the process proceeds to step S49, where a reception start / end signal C is sent to the reception circuit 3, the reception operation of the reception circuit 3 is stopped, and the radio wave correction process ends.

When the radio wave correction processing (step S7), that is, the processing of step S7 in FIG. 2 is completed, or in step S6 in FIG. 2, it is determined that the current count time data of the clock circuit 7 is not true. If so, the process proceeds to step S8, in which a display process for displaying the current count time data of the clock circuit 7 on the display unit 11 is executed, and thereafter, the process returns to step S1, and thereafter, the same operation as described above is repeated. .

(2) Operation after being moved to a place with a bad reception environment The time data receiving apparatus that has performed the above-described operation in a place with a good reception environment is replaced with a long-wave standard time signal containing a time code due to a bad reception environment. Is moved to a place where it cannot be normally received, the following operation is performed. That is,
First, the processing shown in steps S1 to S4 in FIG. 2 is performed in the same manner as described above, and the reception stop flag F is set in step S5.
It is determined that the value of _K is 0, and the next step S
Proceed to 6. In step S6, it is determined whether or not the current time data counted by the clock circuit 7 is at the correct time. If not, the process proceeds from step S6 to step S8, where the current time data of the clock circuit 7 is displayed. The display process to be displayed on the unit 11 is executed, and thereafter, the process returns to step S1, and thereafter, the same operation as described above is repeated.

If the hour has arrived while the above operation is being repeated, it is detected in step S6 in FIG.
The process proceeds to step S7, that is, the radio wave correction process in FIG. In the above-described radio wave correction processing, as in the case described above, step S20 is performed.
Steps S26 to S26 are performed, and the process proceeds to step S27. In step S27, unlike the above-described case, it is determined that the reception environment is poor and reception was not performed normally, and the process proceeds to the next step S28. In step S28, it is determined that the value of the reception impossible flag F _NG remains 0,
Then, the process proceeds to step S29, where the reception impossible flag F
The value of _NG is set to 1, and it is stored that reception was not normally performed in the current radio wave correction processing. Further, in step S30, the value of the reception impossible number register NC is set to 1 which is larger by one, and the fact that the radio wave correction processing in which normal reception has not been performed has been performed only once is stored. In step S49, the reception start / end signal C Is sent to the receiving circuit 3 and the receiving circuit 3
Is stopped, and the radio wave correction process ends.

As described above, when the radio wave correction process, that is, the process of step S7 in FIG.
The display unit 11 displays the current time data of the clock circuit 7 in step 8.
And returns to step S1, and thereafter, the same operation as the above-described operation except for the hour is repeated. When one hour has passed and the hour has come to the beginning again, the process proceeds from step S6 in FIG. 2 to step S7, that is, the radio wave correction process in FIG. 3, and the processes in steps S20 to S27 are performed in the same manner as described above. And in step S28, the reception impossible flag F _NG
Is determined to be 1 instead of 0, and the process proceeds to step S31. In this step S31, it is determined that the value of the unreceivable number register NC is not 3, but is 1, and then the process proceeds to step S30, in which the value of the unreceivable number register NC is increased by 1 to 2, and thereafter In step S49, the receiving operation of the receiving circuit 3 is stopped to end the radio wave correction processing, and the process proceeds to step S49 in FIG.
8. Go to S1.

Similarly, after the hour, the processes of steps S1 to S6 and S8 in FIG. 2 are repeated and executed (ie, the process excluding the radio wave correction process of step S7 is executed). On the other hand, on the other hand, at the normal time, step S1 in FIG.
Steps S8 to S8 are performed, and each time the value of the unreceivable number register NC is increased by one in the radio wave correction processing. When such an operation is performed and the value of the unreceivable number register NC becomes three, another one is added.
When the time has passed and the next hour has arrived, the process proceeds from step S60 in FIG. 2 to step S7, that is, the radio wave correction process in FIG. 3, and the processes in steps S20 to S28 are executed in the same manner as described above. move on. This step S31
, The value of the reception impossible number register NC is already 3, and it is determined that three hours have passed since normal reception was not possible, and the reception stop flag F is determined in the next step S32.
The value of _K is set to 1, and it is instructed not to execute the radio wave correction processing even at the hour (that is, if the reception cannot be normally performed for three hours, the time data receiving apparatus is switched to the reception environment). I guess it was left in a bad place,
In order to eliminate waste of power consumption, subsequent radio wave correction processing is not executed). When the process of step S32 is completed, the value of the reception impossible flag _FNG is returned to 0 in step S33, and in the next step S34, the value of the reception impossible number register NC is cleared and the process proceeds to step S49.
Is performed to complete the radio wave correction process, and the process proceeds to steps S8 and S1 in FIG. Thereafter, as long as there is no switch input or output from the acceleration sensor 10, the processing of steps S1, S5, and S10 in FIG. 1 is repeated regardless of whether it is on the hour or not, and the radio wave correction processing is not executed.

[0021] Incidentally, four times in succession, (before the value of the reception stop flag F _K is 1 at or step S32 in FIG. 3) until the unreceivable is detected, the location of the time data receiving apparatus Has changed to a location with a good reception environment,
Normal reception is performed in the radio wave correction processing at the subsequent hour, and the fact is detected in step S27 in FIG.
Proceeding to step S40, the value of the reception stop flag F _K is still 1
Is determined, the value of the unreceivable number register NC is cleared in step S42, and thereafter, the process proceeds to step S42.
43 to S49, and further to steps S8 and S1 in FIG. 2, the same operation as described above is performed, and the execution of the radio wave correction process is not stopped.

[0022] (3) After the radio-corrected process value for each hour next 1 reception stop flag F _K as operation of the time to force releasing state in which the stop radio correction process is stopped, To forcibly cancel this, one of the switches of the switch section 8 is operated. In this case, detects the operation in step S1 of FIG. 2, it is determined that the value of the reception stop flag F _K in step S2 is set to 1, the value of the reception stop flag F _K proceeds to step S3 on it Is reset to 0, and the instruction to stop the radio wave correction processing is released. Then, after step S4, step S4
At 5, it is determined that the value of the reception stop flag F _K has returned to 0, and the process proceeds to step S6. If it is not the hour, the process proceeds from step S6 to steps S8 and S1, but if it is the hour, the radio wave correction process of step S7 is executed, and thereafter, the process proceeds to steps S8 and S1.

(3) Operation when moving the time data receiving apparatus while the radio wave correction processing is stopped After the radio wave correction processing is stopped as described in (2) above (that is, the reception stop flag) (After the value of F _K becomes 1), when the time data receiving device is moved, for example, by a person to a place having a good reception environment, the acceleration sensor 10 detects acceleration accompanying the movement, A detection output is sent. In this case, the detection output is used in step S1 of FIG.
Detected at 0, the value of the reception stop flag F _K proceeds to the next step S11 returns to zero, i.e., cancels the execution stop of the radio wave correction process, are hereinafter step S6 to S8, the process proceeds to S1, the (3 The same operation is performed as in the case where the execution stop release of the radio wave correction processing is released by the switch operation described in (1).

[0024]

According to the first aspect of the present invention, when the time data receiving apparatus is left in a poor receiving environment and cannot receive the long-wave standard radio wave containing the time code, the fact is determined by the determining means, and the receiving operation stopping means is determined. When the time data receiving apparatus is likely to have been moved to a place having a good receiving environment, the detecting means detects the time data receiving apparatus and the first resuming means resumes the reception. According to a second aspect of the present invention, the first resuming means not only resumes the reception as described above, but also detects the external operation switch operation by the external operation switch. The present invention relates to a time data receiving apparatus in which when an operation is detected, the second resuming means resumes reception upon receipt of the operation. Worse, even if it can not receive the time code longwave standard allows for providing time data receiving apparatus capable of avoiding wasteful power consumption due to repeated operations to attempt the reception at predetermined time intervals.

[Brief description of the drawings]

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

FIG. 2 is a general flowchart showing an outline of the operation of the embodiment.

FIG. 3 is a flowchart showing details of a radio wave correction process in FIG. 2;

FIG. 4 is a diagram showing a format of a time code.

[Explanation of symbols]

 9 RAM C Reception start / end signal TC Time code P Preset signal M 1 minute signal X1 to X3 Reception time memory D1 to D3 Reception integrated date memory X Reception current time memory

Claims (2)

(57) [Claims] 1. A time counting means for obtaining time data by counting a reference clock signal; a receiving means for receiving standard radio waves including a time code at predetermined intervals to obtain reception time data; Discriminating means for discriminating whether or not time data has been obtained; and receiving time data obtained by the receiving means when the discriminating means has determined that accurate reception time data has been obtained. A receiving operation stopping means for stopping the receiving operation of the receiving means at the predetermined intervals when it is determined that accurate receiving data cannot be obtained by the determining means; and Detecting means for detecting that the apparatus has been moved by the detecting means when the receiving operation of the receiving means has been stopped by the receiving operation stopping means. A first resuming unit for resuming the receiving operation of the transmitting unit. 2. An external operation switch operation detecting means for detecting that an external operation switch is operated, and said external operation switch operation detecting means when the receiving operation of said receiving means is stopped by said receiving operation stopping means. 2. The time data receiving apparatus according to claim 1, further comprising: a second restart unit that restarts the receiving operation of the receiving unit when it is detected that the external operation switch has been operated.