JP3881107B2 - Radio correction clock - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a radio-controlled timepiece that receives a standard radio wave.
[0002]
[Prior art]
In countries such as Germany, the United States, and Japan, so-called long-wave standard radio waves that transmit time information using a frequency of about several tens of kHz as a carrier wave are transmitted. In the long wave standard radio wave, the frequency of the carrier wave and the pulse waveform representing 0, 1 etc. of the data differ from country to country except that the data is transmitted in binary. In the following, the standard radio wave will be described taking Japanese long wave standard radio wave -JG2AS- as an example.
[0003]
Japan's longwave standard radio waves are operated by the Communications Research Laboratory (CRL), Ministry of Posts and Telecommunications, and are transmitted from a transmitting station in Miwa Town, Ibaraki Prefecture. This radio wave has two purposes. The first is transmission of a frequency that becomes a national standard, and the second is transmission of Japan Standard Time (JST) advanced by 9 hours based on Coordinated Universal Time (UTC). The long wave standard radio wave transmits time data by applying AM modulation to the standard frequency of −40 kHz, and the radio clock receives the time data of this radio wave.
[0004]
The transmission of time data is 1 bit / sec. One minute is one frame, and this frame contains information on the accumulated date from the minute, hour, and January 1st, and this information is provided as a BCD code. (See FIG. 3). The transmitted data includes a marker called P code in addition to 0 and 1, and these data have a difference due to a difference in modulation (see FIG. 4). There are several places of this P-code in one frame, and appear at the minute (0 seconds), 9 seconds, 19 seconds, 29 seconds, 39 seconds, 49 seconds, 59 seconds. This P code appears continuously only once at 59 seconds and 0 seconds in one frame, and the position where this P code appears continuously becomes the minute position. Since time data such as minute / hour data is determined in the frame with reference to the minute position, time data cannot be extracted unless the minute position is detected.
[0005]
A reception method for a conventional radio-controlled timepiece will be described with reference to FIG. FIG. 2 shows a conventional radio timepiece reception method, wherein 1 is an antenna, 2 is a receiving circuit, 3 is code determination means for determining 0, 1, and P code, 4 is a minute detection means, and 5 is a minute detection. A second counter that performs 60-decimal counting later at 1 Hz, 6 is a reception data storage unit that stores data obtained by reception, 6 g is a block that stores the latest reception data, and 6 h is the reception data of the previous minute or the main counter A block for inputting data, 7 is a comparison means for comparing blocks 6g and 6h to determine whether they are the same value, 8 is an oscillation circuit, 9 is a frequency dividing circuit, 10 is a main counter for performing main counting of the watch, 11 Is a display unit that displays the count value of the main counter, 12 is a switch for starting reception, 13 is counted until a certain time after SW12 is turned ON, and when it exceeds a certain time, a command to end reception Consisting of be ON time counter.
[0006]
The actual operation will now be described. When the SW 12 is turned on, the clock function unit starts supplying the output of the frequency dividing circuit to the receiving unit, and the ON time counter 13 starts counting. On the other hand, the receiving circuit 2 is turned on, the standard radio wave obtained from the antenna is amplified, filtered and detected, and the demodulation result is output. Receiving circuit 2 by a code judging unit 3 based on the output demodulation result from 0,1, performs determination of the P-code, perform a positive frequency detection means 4 detects a where P code appears twice in succession. If it is detected here, it is determined that the detected position is an exact minute, a count start command is issued to the second counter 5, and data input to the block 6g is started with the count value as the latest data. Further, when the minute detection is less than one minute, that is, when there is no data in the block 6h, the value of the main counter 10 is input to the block 6h. When the minute, hour, and accumulated date data are accumulated in the block 6g, the comparison means 7 compares the data of the block 6g and the block 6h. If it is determined that the comparison result is the same value, the value of the second counter 5 and the value of the block 6g are substituted into the main counter 10, the reception end command is issued from the comparison means 7, and the SW 12 is turned OFF, thereby the receiving circuit. Is turned off. On the contrary, when it is determined that the comparison result is not the same value, the value of the block 6g plus 1 is substituted into the block 6h, and the reception end command is not issued from the comparison means 7 and the reception is continued. Also, the main counter is not updated. Thereafter, when the next new data is input to the block 6g, the data of the block 6g and the block 6h are compared, and if the same value as described above, the value of the block 6g is substituted into the main counter and the reception is terminated. Then, the value of the block 6g plus a value divided by 1 is substituted into the block 6h. If they are not the same value, these operations are repeated until the ON time counter 13 reaches a certain time and a reception end command is issued. If reception does not end even after a certain period of time, the reception result is NG and the value of the main counter is not changed.
[0007]
[Problems to be solved by the invention]
As described above, in the conventional technology, when only a certain bit receives wrong data, all the data of the frame becomes invalid, and as a result, the time required for reception becomes long, or the reception success is missed in a difficult place. There was a problem. The present invention is intended to solve the above-described problems, and an object of the present invention is to eliminate the point that data received correctly is unnecessarily invalidated.
[0008]
[Means for Solving the Problems]
To achieve the above object, the present invention provides:
In the radio correction clock that receives the standard radio wave and corrects the time,
A clock function, an antenna that receives standard radio waves,
A receiving circuit that extracts a desired frequency and performs amplification and detection; and
Code determination means for determining a code from detection data output from the receiving circuit;
An exact part detecting means for detecting the head position of the frame based on the determination result of the code determining means;
A reception data storage unit for storing time data included in the frame for a plurality of times ;
And a comparing means for determining whether the received data is correct by comparing a plurality of time data stored in the received data storage unit in the block between the predetermined unit,
Determine whether the received data is correct for each block ,
Only receive blocks that contain invalid data ,
An elapsed time counter that counts the time since the minute detection means detects a minute; and
When the comparison means determines that the received data is correct
Data storage means for storing the received data and the value of the elapsed time counter;
And a calculation means for determining final time data from the result of the data storage means .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. The same components as those in FIG.
[0010]
The minute 6a in the received data storage unit 6 is a part for storing minute block data of the latest received data. Similarly, the hour 6b accumulates hour data and the accumulated date 6c accumulates accumulated date data. The minute 6d stores the data of the current time or the data of the minute block of the data received one minute ago. Similarly, the hour 6e stores the hour data, and the integration date 6f stores the integration date data. Next, 7a in the comparing means 7 is a minute block data comparing means, which compares the minutes 6a and 6d and determines whether the data of the result 6a is correct. Similarly, the comparison means 7 is composed of the hour block data comparison means 7b for comparing / determining the time 6b and the time 6e, and the integration date block data comparison means 7c for comparing / determination of the integration date 6c and the integration date 6f. Yes. The elapsed time counter 14 counts up when the second counter 4 is 60, that is, 1 minute. 15a included in the data storage means 15 is a minute data storage means, which stores the latest received data and the elapsed time at that time when the minute block data comparison means 7a determines that the data is correct. Similarly, 15b is a storage means for the time block, and 15c is a storage means for the accumulated date. Next, the minute counter 10a included in the main counter 10 counts the amount of the main counter when not receiving, and when the data is stored in the data storage means 15a at the time of reception, the data stored in the data storage means 15a Is supposed to be entered. Hereinafter, the hour counter 10b and the accumulated date counter 10c have the same function. Next, 16 is a calculation means, which creates time data for updating the main counter from the reception data stored in the data storage means 15a, 15b and 15c and the elapsed time, and judges whether or not the reception has been performed correctly. With the ability to do. The main counter saving unit 17 temporarily holds time information of the main counter when reception is started. The above is the configuration of an embodiment of the present invention.
[0011]
The operation will be described with reference to FIG. 1 in the case of the Japanese standard radio wave JG2AS as in the prior art.
When SW12 is turned on, the entire display on the display unit 11 starts blinking at intervals of 0.5 seconds as a reception start signal. The main counter saving unit 17 holds the data of the main counter 10 (measures time even after holding), the receiving circuit 2 starts operating, amplifies the radio wave obtained from the antenna 1,
Frequency filter processing and detection are performed, and a detection result is output from the receiving circuit 2. Based on the detection result, the code determination means 3 determines each of the 0, 1, and P codes, and the minute detection means 4 detects where the P code appears twice in succession. If it is detected here, it is determined that the detected position is an exact minute, a count start command is issued to the second counter 5, and the received data is input as the latest data to the minute 6a, hour 6b, and integration date 6c. To start. Further, when there is no reception data at minute 6d, hour 6e, and integration date 6f, the value of the main counter 10 is input to the minute 6d, hour 6e, and integration date 6f.
Since the following operations are the same operations in the processing for each minute, hour, and accumulated date, only the minute will be described.
When the input of the latest data is completed in the minute 6a, the minute block data comparison unit 7a performs the first data comparison using the minute 6a and the minute 6d in which the value of the minute counter 10a is inputted. As a result of the comparison, if it is determined that the values are the same, the value of the minute 6a and the value of the elapsed time counter 14 are stored in the minute data storage means 15a. On the other hand, if it is determined that the value is different, the data obtained by adding the minute 6a plus 1 is input to the minute 6d and held as one minute previous data, and the next latest data is compared with the second latest data. Thereafter, this operation is repeated until data coincidence is detected. When the minute block data comparing means 7a determines that the minute 6a and the minute 6d are different from each other, it is not stored in the minute data storage means 15a.
When the same value is confirmed by the minute block data comparison means 7a and the data is stored in the minute data storage means 15a, the value of the minute counter 10a is updated to the stored data, and the minute display 11a displays all the values of the minute counter 10a. Lights up to indicate that the minute block has been received. The above operations are the same for the time and the accumulated date.
Through the above operation, when all the storage means of the data storage means 7 are stored, that is, when it is determined that the correct data is obtained in all the blocks, the time of reception at the calculation means 16 based on these data is obtained. The final result is output and the result is reflected in the main counter 10. In addition, the reception ends when the final result is obtained, and the value of the main counter saving unit 17 is cleared. The display 11 displays the value of the main counter.
If all the storage means in the data storage means 7 are not stored by the time when the ON time count 13 issues a reception end signal to the SW 12, the time obtained by reception is incomplete, and in this case, reception fails. And the ON time counter 13 issues an instruction to turn off the SW 12, and the arithmetic means 16 issues an instruction to input the value held in the main counter saving unit 17 to the main counter 10, and the value is set. Displayed on the display unit 11. The above is the operation of one embodiment of the present invention, which will be described using specific received data.
[0012]
5 and 6 show received data in a case. The process of reception will be described according to the operation described above.
First, FIG. 5 will be described. To start reception, SW12 is turned ON and the receiving circuit 2 is activated. After the minute detection means 4 detects the minute, the current time 59 is input to the minute 6d, 18 is input to the hour 6e, and 176 is input to the integration date 6f. In each block, 59 is stored as the latest data, 59 at the minute 6a, 18 at the hour 6e, and 176 on the integration date 6f. When the latest data accumulation is completed, the comparison means 7 compares each block. In this case, since all the data have the same value, the latest data for each block and the value of the elapsed time counter 14 (in this case, 0) are stored in the data storage unit 15. Since all the blocks store data, the calculation means 16 performs calculation. Since the elapsed times are all 0 and the same, the time data stored in the minute data storage means 15a, hour data storage means 15b, and accumulated date data storage means 15c are input as they are to each block of the main counter, and the calculation means 16 A reception end command is issued and SW12 is turned OFF. The above is the description of FIG.
[0013]
Next, the case of FIG. 6 will be described. (The shaded data in the figure indicates that it is incorrect, and the * mark means that it is not stored as data.)
The operation until the minute detection unit 4 detects the minute is the same as described above. After detecting the minutes, 45, which is the current time data, is input to the minute 6d, 6 is input to the hour 6e, and 62 is input to the integration date 6f. As the latest data, 59 is input to the minute 6a, 18 is input to the hour 6b, and 176 is input to the integration date 6f. When the latest data accumulation is completed, the comparison means 7 performs the first comparison for each block. In this case, no data is stored in the storage unit 15 because the data is different in all blocks. When the comparison is completed, the value obtained by adding 1 to the minute 6a is substituted for the minute 6d , the hour 6b is substituted for the hour 6e, and the integration date 6c is assigned to the integration date 6f. (At this time, when a carry occurs in each block, the carry data is substituted.) After a while, the carry of the second counter 5 occurs, and the elapsed time counter 14 is incremented. Then, the next latest data is accumulated. When the accumulation is completed, the data is compared for the second time. In this case, since the data equivalence is confirmed in the minute block, the value “1” of the elapsed time counter and the received data “ 00 ”is stored in the minute data storage means. Since the other blocks are not the same value, they are continuously received. In the third comparison, there is no coincidence of the hour and the accumulated date. Next, although it is the fourth comparison, since the same value is confirmed on the integration date at this time, the value “3” of the elapsed time counter 14 and the received data “176” at this time are stored in the integration date data storage means 15 c. In the fifth comparison, the last time block is confirmed to have the same value, and the value “4” of the elapsed time counter 14 and the received data “19” are stored in the time data storage means 15b. Here, when the data is stored in all the storage means, the calculation means 16 performs the calculation using all the data. The contents of the calculation are as follows. First, in order to specify the time when the minute is detected, the elapsed time counter value “1” of the minute is subtracted from the minute data “00”. In this case, the minute digit is “59” because it is in hexadecimal. Further, the maximum value “4” of the “59” elapsed time counter is added. As a result, the data becomes “63” and it is understood that there was a carry of time during reception. Here, it is necessary to determine whether the hour data is stored before or after the carry of the hour. Therefore, when the minute detection time “59” is added to the elapsed time counter value “4” when the hour data is stored, “63” is obtained, and it is understood that the data is stored after the carry. Therefore, it can be seen that the minute detection time is 18:59. Further, since the minute data is obtained by adding the maximum value of the elapsed time counter value to the minute detection and becomes the current time, in this case, it is “63” and the minute digit is in 60's, so the minute data is finally “03”. It becomes. In this case, since the hour digit is determined to be “19” in this case, there is no carry-up of the integrated date, so that the reception date “176” is determined. From the above results, the final received data output from the calculating means 16 is 176th 19:03. In this example, there was no carry of the accumulated day digit during reception, but if there is, the value of the elapsed time counter that specified the minute detection time as described above and the accumulated date was stored at that time And the received data on the final integration date can be determined depending on whether the result is before or after 0:00.
[0014]
Also, if the integration date is 365 days and 0:00 is received, there is no problem if the integration date digit is determined after 0:00, but if it is determined before 0:00, it cannot be determined whether it is a leap year. After all the minute, hour and date data are determined, only the date of integration may be received again.
[0015]
Further, when the reception is completed by the ON time counter 13, the data of the main counter saving unit 17 is substituted into the main counter and displayed on the display unit 11. However, only the blocks for which reception has been completed are left as they are in the main counter, and the data is stored. The data of the main counter saving unit 17 may be used only for blocks that cannot be extracted, and in this case, only the blocks that cannot be extracted may be turned on so that the user can correct the portion.
[0016]
If the minute detection is different from the first detected position, the second counter 5, the elapsed time 14, the received data storage unit 6 and the data storage unit 15 may be cleared so that all the display units are turned on. .
[0017]
In this embodiment, the data storage unit 6 stores data for two frames. However, the storage amount is increased. For example, the data storage unit 6 has a storage amount of 5 frames. May be treated as correctly received data.
[0018]
【The invention's effect】
As described above, according to the present invention, it is possible to effectively use received data by dividing one frame of received data and comparing a plurality of frames for each divided block. Data can be extracted for the blocks that can be received, and the probability of successful reception is increased.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of the present invention.
FIG. 2 is a block diagram according to the prior art.
FIG. 3 is a diagram illustrating an example of data transmission of a standard radio wave JG2AS.
FIG. 4 is a waveform diagram showing 0, 1, and P codes of a standard radio wave JG2AS.
FIG. 5 is a diagram illustrating an example of received data.
FIG. 6 is a received data pattern diagram showing an error in received data.
[Explanation of symbols]
6 Received data storage section 7 Comparison means 14 Elapsed time counter 15 Data storage means 16 Calculation means 17 Main counter saving means

Claims (11)

In the radio correction clock that receives the standard radio wave and corrects the time,
A clock function, an antenna that receives standard radio waves,
A receiving circuit that extracts a desired frequency and performs amplification and detection; and
Code determination means for determining a code from detection data output from the receiving circuit;
An exact part detecting means for detecting the head position of the frame based on the determination result of the code determining means;
A reception data storage unit for storing time data included in the frame for a plurality of times;
Comparing means for judging whether or not the received data is correct by comparing a plurality of time data stored in the received data storage unit between blocks of a predetermined unit,
Determine whether the received data is correct for each block,
Only receive blocks that contain invalid data,
An elapsed time counter that counts the time since the minute detection means detects a minute; and
Data storage means for storing the received data and the value of the elapsed time counter when the comparing means determines that the received data is correct;
A radio-controlled timepiece comprising arithmetic means for determining final time data from the result of the data storage means. A plurality of time data stored in the received data storage unit is stored for each block of the predetermined unit,
The comparison means includes
2. The radio-controlled timepiece according to claim 1, wherein the comparison between the plurality of time data is performed in units of blocks accumulated in the predetermined unit. The radio-controlled timepiece according to claim 1, wherein the data storage unit stores the received data and the value of the elapsed time counter for each predetermined unit. The radio-controlled timepiece according to any one of claims 1 to 3, wherein the number of time data stored in the reception data storage unit is two. The time data stored in the received data storage unit is
5. The radio-controlled timepiece according to claim 4, wherein the latest received data and the data received one frame before. The time data stored in the received data storage unit is
The radio-controlled timepiece according to claim 4, wherein the radio-controlled timepiece is the latest received data and data of the current time. The comparing means is
The radio wave correction according to any one of claims 1 to 3, wherein when a predetermined number or more matches are detected among a plurality of time data stored in the reception data storage unit, the reception is determined to be successful. clock. The number of the plurality of time data is 5, and when a match is detected between three or more time data stored in the reception data storage unit, it is determined that reception is successful. Item 8. The radio-controlled timepiece according to item 7. 9. The radio-controlled timepiece according to claim 1 , wherein the predetermined unit is a time display unit such as minutes, hours, and accumulated days . The radio-controlled timepiece according to any one of claims 1 to 9, wherein the predetermined unit is a digit unit of a time display unit . The clock function unit includes a counter for measuring time,
A counter saving unit for temporarily holding time information of the counter at the time of reception, and a display unit for displaying the value of the counter;
If it is determined that the received data contains invalid data,
If the received data is determined to be correct, the block is moved to the corresponding block in the counter,
The radio-controlled timepiece according to any one of claims 1 to 10, wherein a block in which received data includes illegal data moves data of the corresponding counter saving unit to a corresponding block of the counter .

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