JPH11304973A - Electronic wave correction clock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a probability where reception is successful, by dividing one frame of reception data, comparing a plurality of frames for each divided block for effectively utilizing the reception data, and extracting data for an appropriately received block even in the case of a block that has not been received up to that point. SOLUTION: An electronic wave correction clock accumulates most recent data and the previous data, divides the data into blocks such as minutes and hours, compares the most recent data with the previous data for each block, stores the most recent data and the value of a lapse time counter 14 at a data storage means 15 when a comparison means 7 judges that the data are identical, calculates a final reception result by an operation means 16 when data are stored in all blocks, and changes time that a main counter 10 has to the reception result, thus effectively utilizing the data of a block where data could not be mistaken in one frame and improving the probability of successful reception.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio-controlled timepiece for receiving a standard radio wave.

[0002]

[Prior art] In countries such as Germany, the United States and Japan,
A so-called long-wave standard radio wave for transmitting time information using a frequency of about several tens of kHz as a carrier wave has been transmitted. In recent years, a radio-controlled timepiece using this standard radio wave has been widely used. The long-wave standard radio wave differs from country to country in the carrier wave frequency and the pulse waveform representing data 0, 1, etc., except that the data is transmitted in a binary system. In the following, the standard radio wave will be described with reference to Japan's long wave standard radio wave-JG2AS-as an example.

[0003] Japan's long-wave standard radio waves are operated by the Communications Research Laboratory (CRL) of the Ministry of Posts and Telecommunications, and are transmitted from a transmitting station in Miwa-cho, Ibaraki Prefecture. This radio wave has two purposes. The first is transmission of a frequency that is a national standard, and the second is transmission of Japan Standard Time (JST), which has advanced 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 -40 kHz, and the radio clock receives the time data of this radio wave.

[0004] The transmission of time data is one bit per second at one minute as one frame, and this frame contains information on minutes, hours, and integrated dates from January 1st, and these information are BCD. Supplied in code (see Figure 3). The transmitted data includes a marker called a P code in addition to 0 and 1, and these data are different due to a difference in modulation (see FIG. 4). This P-code has several places in one frame, the minute (0 second), 9 seconds, 19
Appears at seconds, 29 seconds, 39 seconds, 49 seconds, 59 seconds. This P
The code will appear once every frame for 59 seconds,
Only at the time of 0 second, the position that appears continuously becomes the minute position. Time data such as minute / hour data and the like in the frame are determined based on the minute minute position, so that the time data cannot be extracted unless the minute minute position is detected.

A conventional method of receiving a radio-controlled timepiece will be described with reference to FIG. FIG. 2 shows a conventional method of receiving a radio clock, in which 1 is an antenna, 2 is a receiving circuit, and 3 is 0, 1, P.
Code determination means for determining a code, 4 is a minute detection means, 5 is a second counter which counts 60 at 1 Hz after the detection of a minute, 6 is a reception data storage section for storing data obtained by reception, and 6g is a reception data storage section. A block for storing the latest received data, 6h is a block for inputting the received data one minute ago or the data of the main counter, 7 is a comparing means for comparing the block 6g and the block 6h and judging whether or not they have the same value, 8
Is an oscillation circuit, 9 is a frequency dividing circuit, 10 is a main counter that performs a main count of a watch, 11 is a display unit that displays the count value of the main counter, 12 is a switch for starting reception, and 13 is a time after the SW 12 is turned on. And an ON time counter that issues a command to end reception when a certain time has elapsed.

Now, the actual operation will be described. S
When W12 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, and the standard radio wave obtained from the antenna is amplified, filtered, and detected.
The code as shown in FIG. 4 is output. The waveform output from the receiving circuit 2 determines 0, 1, and P codes by the code determination means 3. From this detection result, the code determination means 3 determines 0, 1, P
Each code is determined, and the correct-minute detecting means 4 detects a point where the P code appears twice consecutively. If detected here, it is determined that the detected position is the correct minute, a count start command is issued to the second counter 5, and the data input to the block 6g is started with the count value as the latest data. If less than one minute has passed since the detection of the correct minute, that is, if 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 comparing means 7 causes the block 6g and the block 6h to store the data.
Data comparison. If it is determined that the comparison result is the same, the value of the second counter 5 and the value of the block 6g are substituted into the main counter 10, and a receiving end command is issued from the comparing means 7, and the SW 12 is turned off. Is O
FF is performed. Conversely, when it is determined that the comparison result is not the same value, the value of the block 6g plus the value obtained by dividing the value by one minute into the block 6h
And the receiving means is not issued from the comparing means 7 and the receiving is continued. Also, the main counter is not updated. After that, when the next new data is input to the block 6g, the data of the block 6g and the data of the block 6h are compared. If the values are the same as described above, the value of the block 6g is substituted into the main counter to end the reception. If so, the value of the block 6g plus the value obtained by dividing the value by 1 is assigned to the block 6h. If the values are not the same, these operations are repeated until the ON time counter 13 reaches a certain time and a reception end command is issued. If the reception is not completed even after the ON time counter 13 has passed a certain time, the reception result is NG, and the value of the main counter is not changed.

[0007]

As described above, in the prior art, when only a certain bit receives incorrect data, all the data in the frame becomes invalid, and as a result, the time required for reception becomes longer, There has been a problem that the successful reception is missed in a regrettable place. SUMMARY OF THE INVENTION The present invention is intended to solve the above-described problem, and it is an object of the present invention to solve the problem of invalidating correctly received data.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a radio-controlled timepiece for receiving a standard radio wave and correcting the time, comprising: a clock function unit; an antenna for receiving the standard radio wave; Circuit for extracting and amplifying / detecting the signal, code determining means for determining a code from the detection data output from the receiving circuit, and correct-minute 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 according to the code; a comparing unit for dividing the time data and comparing each divided block to determine whether received data is correct; and a receiving unit for each divided block. It is characterized in that it is determined whether or not the data is correct, and only the divided block containing the incorrect data is continuously received. Further, an elapsed time counter for counting the time since the correct minute detecting means detects the correct minute, and a value of the received data and the value of the elapsed time counter are stored when the comparing means determines that the received data is correct. It is characterized by having a data storage means and an operation means for determining final time data from the result of the data storage means. Further, the divided block is divided into frames in units of time display, such as minutes, hours, and integrated dates. Further, the present invention is characterized in that the divided block is divided into frames in units of time display units. In addition, when the divided block is divided into frames in units of time display, such as minutes, hours, and integration dates, a block for which received data is determined to be correct may be used even if received data for another block is not determined to be correct. The reception data is displayed on the display unit.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below 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. 2 are denoted by the same reference numerals, and description thereof is omitted.

The minute 6a in the received data storage unit 6 is a part for storing minute block data of the latest received data. Similarly, hour 6b is hour data and 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 before. 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 minute 6a with the minute 6d and determines whether or not the data of the minute 6a is correct as a result. Similarly, the time block data comparing means 7b for comparing / determining the time 6b and the time 6e, and the integration date 6c
Comparing means 7 is composed of an accumulated date block data comparing means 7c for comparing / determining the accumulated date and the accumulated date 6f. The elapsed time counter 14 counts up when the second counter 4 reaches 60, that is, 1 minute. Reference numeral 15a included in the data storage unit 15 is a data storage unit that stores the latest received data and the elapsed time at that time when the minute block data comparison unit 7a determines that the data is correct. Similarly 1
5b is a storage unit for the hour block, and 15c is a storage unit for the accumulated date. Next, the minute counter 10a included in the main counter 10 counts the number of the main counter when not receiving data,
5a, when the data is stored, the data storage means 1
5a is input. Hereinafter, the hour counter 10b and the accumulated date counter 10c have the same function. Next, reference numeral 16 denotes an arithmetic unit which creates time data for updating the main counter from the reception data and the elapsed time stored in the data storage units 15a, 15b, and 15c, and determines whether the reception has been performed correctly. With the ability to do The main counter evacuation unit 17 temporarily stores the time information of the main counter when the reception is started. The above is the configuration of the embodiment of the present invention.

The operation will be described with reference to FIG. 1 in the case of the Japanese standard radio wave JG2AS, similarly to the prior art. When the SW 12 is turned on, the entire display on the display unit 11 starts blinking at 0.5-second intervals as a signal to start reception. Then, the main counter evacuating unit 17 holds the data of the main counter 10 (measures the time after holding the data), the receiving circuit 2 starts operating, amplifies radio waves obtained from the antenna 1, performs frequency filtering, and performs detection. The 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 if the P code is 2
An exact detection unit 4 detects a portion appearing consecutively. If it is detected here, it is determined that the detected position is the correct minute, a count start command is issued to the second counter 5, and the count value is set as the latest data, and the received data is input to the minute 6a, the hour 6b, and the integration date 6c. To start. If less than one minute has passed since the detection of the minute, that is, if there is no received data on minute 6d, hour 6e, and integration date 6f, the value of main counter 10 is reduced to minute 6d, hour 6e,
Data is input on the integration date 6f. The following actions are performed in minutes, hours,
Since the same operation is performed in each process for each integration day, only the minutes will be described. When the input of the latest data into the minute 6a is completed, the minute block data comparing means 7a performs the first data comparison using the minute 6a and the minute 6d in which the value of the minute counter 10a is input. 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 unit 15a. Conversely, if it is determined that the value is different, the data obtained by adding 6 minutes plus 1 is input to the minute 6d, held as the data one minute before, and the next data is compared with the second latest data. Thereafter, this operation is repeated until a data match is detected. When the minute block data comparing means 7a determines that the minute 6a and the minute 6b are different values, the minute data storing means 15a does not store the value. When the same value is confirmed by the minute block data comparing means 7a and the data is stored in the minute data storing means 15a,
The value of the minute counter 10a is updated to the stored data,
The value of the minute counter 10a is fully lit by the minute display 11a, indicating that the reception of the minute block has been completed. The above operation is the same for the hour and the accumulated date. After the above operations, all the storage units of the data storage unit 7 are stored, that is, if it is determined that correct data has been obtained in all the blocks for reception, the operation unit 16 based on these data is obtained.
To give the final result of the time received, and reflect the result on the main counter 10. When the final result is obtained, the reception is completed and the value of the main counter saving unit 17 is cleared. The display unit 11 displays the value of the main counter. If all the storage units in the data storage unit 7 are not stored before the ON time count 13 outputs the reception end signal to the SW 12, the time obtained by reception is incomplete, and in this case, reception fails. Then, 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 evacuation unit 17 to the main counter 10. It is displayed on the display unit 11. The above is the operation of the embodiment of the present invention, which will be described using specific received data.

FIGS. 5 and 6 show received data in a certain case. The history of reception will be described according to the above-described operation. First, FIG. 5 will be described. SW12 is turned on to start reception, the receiving circuit 2 operates, and the correct minute detecting means 4 detects the correct minute, the current time 59 at minute 6d, 18 at hour 6e, and 17 at accumulated date 6f.
6 is input. Then, as the latest data in each block, 59 at minute 6a, 18 at hour 6e, and 176 at 6f
Is accumulated. When the latest data accumulation is completed, the comparison unit 7 compares each block. In this case, since all data have the same value, the latest data for each block and the value of the elapsed time counter 14 (0 in this case) are stored in the data storage unit 15. Then, since all the blocks store data, the calculating means 16 performs the calculation. Since the elapsed times are all 0 and the same, the values of the time data as they are stored in the minute data storage means 15a, the hour data storage means 15b, and the accumulated date data storage means 15c are input to each block of the main counter. Issue a reception end command and turn off SW12. The above is the description of FIG.

Next, the case of FIG. 6 will be described. (The shaded data in the figure indicates that the data is incorrect, and the asterisk indicates that the data is not stored as data.) Until the correct minute detecting means 4 detects the correct minute Is the same as described above. After the detection of the correct minute, data 45 of the current time is input at minute 6d, 6 at hour 6e, and 62 at integrated date 6f. Then, as the latest data, 59 for minute 6a, 18 for hour 6b, and 176 for accumulated date 6f are input. When the latest data accumulation is completed, the comparison means 7 performs the first comparison for each block. In this case, since the data is different in all the blocks, it is not stored in the storage means 15 at all. When the comparison is completed, the value obtained by adding 1 to the minute 6a is assigned to the minute 6d. Similarly, the hour 6b is assigned to the hour 6e, and the accumulated date 6c is assigned to the accumulated date 6f. (If a carry occurs in each block at this time, the data after carrying is substituted.) After a while, 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 equivalent is confirmed in the minute block, the value of the elapsed time counter “1” and the received data “ 00 ”is stored in the minute data storage means. Since the other blocks are not the same, reception is further continued. In the third comparison, there is no agreement between the hour and the accumulated date. Next, for the fourth comparison, since the same value was confirmed at this time on the accumulation date, the value “3” of the elapsed time counter 14 and the received data “176” at this time are stored in the accumulation date data storage means 15c. In the fifth comparison, it is confirmed that the last hour block has the same value, and the value “4” of the elapsed time counter 14 and the received data “19” are stored in the hour data storage unit 15b.
Is stored. 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 operation are as follows. First, the elapsed time counter value “1” of the minute is subtracted from the minute data “00” in order to specify the time at which the true minute is detected. Minute digit is 60
In this case, it is "59". Furthermore, this "5
9) add the maximum value "4" of the elapsed time counter. As a result, the minute data becomes "63", indicating that there was a carry during reception. Here, it is necessary to determine whether the hour data is stored before or after the hour carry. Thus, when the minute detection time "59" is added to the elapsed time counter value "4" when the hour data is stored, the result becomes "63", indicating that the data is stored after the hour carry. Therefore, it can be seen that the minute detection time is 18:59. Further, the minute data is obtained by adding the maximum value of the elapsed time counter value to the detection of the minute minute, which is the current time. In this case, the minute data is "63" and the minute digit is hexadecimal. Becomes In this case, the hour digit is "1".
Since it is determined to be "9", there is no carry of the integration date, so that the reception data "176" is determined. From the above results, the final received data output from the calculating means 16 is 176 days 1
9:03. In this example, there was no carry of the accumulated date digit during reception, but if so, the minute detection time was specified as described above, and the value of the elapsed time counter where the accumulated date was stored at that time Is added and the result is before or after 0:00, so that the final received data of the integration date can be determined.

[0014] Also, when the integration date is 365 days and the reception is 0: 0.
When it reaches 0, there is no problem if the accumulated date digit is determined after 0:00, but if it is decided before 0:00, it is not possible to determine whether or not it is a leap year. You may make it receive only an integration day.

When the reception is completed by the ON time counter, the data of the main counter evacuation unit 17 is substituted for 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 on the main counter.
Only the blocks from which the data could not be extracted use the data of the main counter evacuation unit 17, and in this case, only the blocks from which the data could not be extracted may be turned on, so that the user may correct the portion.

If the true 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 means 15 are cleared, and all the display units are returned to the lighting state. May be.

In this embodiment, the data storage unit 6 stores data for two frames. However, the storage amount is increased, for example, the storage amount is five frames, and three or more blocks are the same in each of the five frames. If there is data,
It may be treated as correctly received data.

[0018]

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 from blocks that have been correctly received even in frames that have been received NG up to now, and the effect of increasing the probability of successful reception is obtained.

[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 a conventional technique.

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 reception data pattern diagram showing an error in reception data.

[Explanation of symbols]

 6 Received data storage unit 7 Comparison means 14 Elapsed time counter 15 Data storage means 16 Calculation means 17 Main counter saving means

Claims (5)

[Claims] 1. A radio-controlled timepiece for receiving a standard radio wave and correcting the time, comprising: a clock function unit; an antenna for receiving a standard radio wave; a receiving circuit for extracting a desired frequency and amplifying / detecting the received signal; Code determination means for determining a code from the detection data outputted from the detection data, a correct minute detection means for detecting a head position of a frame based on the determination result of the code determination means, and a reception data storage unit for storing time data based on the code. A comparing unit that divides the time data and compares each divided block to determine whether received data is correct;
Determine whether the received data is correct for each of the divided blocks, only the divided blocks containing incorrect data,
A radio-controlled watch characterized by continuous reception. 2. An elapsed time counter for counting a time period after the correct minute detecting means detects a correct minute, and an elapsed time counter for counting the received data and the elapsed time counter when the comparing means determines that the received data is correct. 2. The radio-controlled timepiece according to claim 1, further comprising: data storage means for storing a value; and arithmetic means for determining final time data from a result of the data storage means. 3. The radio-controlled timepiece according to claim 1, wherein the divided block is divided into frames in units of time display such as minutes, hours, and integrated dates. 4. The radio-controlled timepiece according to claim 1, wherein the divided block divides a frame in units of digits of a time display unit. 5. When the divided block is divided into frames in units of time display such as minutes, hours, integrated dates, etc., a block for which the received data is determined to be correct is determined to be for which the received data of another block is correct. 3. The radio-controlled timepiece according to claim 2, wherein the received data is displayed on the display unit even if it is not.