JP5320789B2 - Radio receiver and radio clock - Google Patents

Description

  The present invention relates to a radio wave receiver that receives a radio wave modulated by a time code, and a radio timepiece that corrects an internal clock based on the received time code.

  There has been a radio clock that automatically receives the time code and corrects the internal clock. As shown in FIG. 3, the time code is a code in which 60 kinds of three data pulses are arranged at intervals of 1 second in one frame in Japanese standard radio waves. The three types of data pulses include marker pulse M or position marker pulses P0 to P5 having a pulse width of 0.2 seconds, one data pulse having a pulse width of 0.5 seconds, and 0 having a pulse width of 0.8 seconds. There is a data pulse. The position marker pulse is a signal representing the frame position of the time code, the 1 data pulse is a signal representing the data value “1”, and the 0 data pulse is a signal representing the data value “0”.

The time code is transmitted after AM modulation of a 40 kHz or 60 kHz carrier wave. However, when the radio wave condition is bad, pulsed external noise and white noise are mixed in the received time code signal, and an accurate data pulse is transmitted. The signal waveform cannot be obtained. In view of this, various proposals have been made to enable correct discrimination of time codes even when an accurate signal waveform cannot be obtained (for example, Patent Document 1).
JP 2003-215277 A

  In general radio timepieces, the time data indicated by the internal clock is slightly shifted in units of seconds after the time of the internal clock is corrected by receiving the time code, even if the time is not corrected in January. Only occurs. However, in conventional radio-controlled timepieces, even when the time data of the internal clock is hardly shifted, it is normal to receive the time code for the entire period of one frame or multiple frames and correct the time. It was.

  However, in a wristwatch or the like driven by a small battery, a relatively large amount of power is consumed in the time code reception process, and there is a demand for shortening the total time for performing the radio wave reception operation in the time correction process. .

  When the time correction is performed by receiving all the time codes of one frame or a plurality of frames, generally, the time correction process is interrupted only when a reception error occurs in one data pulse, and one frame or a plurality of times is again generated. The time code of the frame is received from the beginning, or the time correction process is terminated due to an error.

  In general, the external noise has a large influence when the signal amplitude of the data pulse is small, and becomes small when the signal amplitude is large. Therefore, among the three types of data pulses, the 0 data pulse with the widest pulse width is least affected by the external noise, and the marker pulse M with the narrowest pulse width and the position marker pulses P0 to P5 are the external noise. It is thought that it becomes the most susceptible.

  Therefore, if the time adjustment is performed by receiving all the time codes of one frame or multiple frames, it is necessary to accurately receive data pulses that are easily affected by external noise. There was also a problem that it was difficult to complete normally.

  Therefore, as shown in FIG. 3, the present inventors, for example, the 4th, 10th, 11th, 14th, 20th, 21st, 24th, 34th of the time code. Second, 35th, 55th to 58th data pulses are always 0 data pulses. By receiving only these 0 data pulses intermittently, the frame position of the time code can be determined. A technique for detecting and correcting the minute point (X minute 00 second point) of the internal clock was examined. As described above, by using the 0 data pulse, it is possible to correct the time that is not easily affected by the external noise, and it is possible to reduce power consumption for radio wave reception by partial reception processing.

  However, since the data pulses constituting the time code include a relatively large number of 0 data pulses, when only a plurality of intermittently arranged 0 data pulses are to be received for time correction, There are many cases where a 0 data pulse happens to be placed next to a plurality of 0 data pulses, and it is confused whether the received 0 data pulse is a reception target or the next one. Therefore, it was thought that there were cases where time correction could not be performed accurately.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a radio wave receiver and radio wave clock that can perform a reception process that is less affected by external noise with less power consumption and can correct the time without error.

In order to achieve the above object, the present invention provides:
In a radio wave receiver that receives a time code in which a plurality of types of data pulses having different pulse widths are arranged,
Receiving means for receiving a standard radio wave and detecting the time code from the standard radio wave;
A time measuring means for measuring time;
Corresponds to four or more data pulse positions where it is known that two or more types of data pulses other than the data pulse having the narrowest pulse width among the plurality of types of data pulses are arranged in the time code. Reception control means for causing the reception means to perform time code reception processing in each reception section;
When the data pulse received in the reception section is the same as the known data pulse, time correction means for correcting the minute part of the time measuring means based on the received data pulse;
Equipped with a,
The plurality of types of data pulses are composed of a marker data pulse representing a frame position of a time code, a 0 data pulse representing a binary data, and a 1 data pulse,
The reception section is set to a section corresponding to four or more data pulse positions where it is known that the 0 data pulse and the 1 data pulse are arranged, and the time measuring means indicates an odd number. And a section corresponding to the data pulse positions of the 8th, 14th, 24th and 58th seconds of the time code .

  According to the present invention, the time adjustment is performed by receiving the data pulse of a part of the time code. For example, the power consumption for the time adjustment is reduced by stopping the reception operation in the other part. Can be achieved. Therefore, the power consumption required for the time adjustment can be greatly reduced as compared with the configuration in which the time adjustment is performed by receiving the entire time code of one frame or a plurality of frames.

  In addition, data pulses that are easily affected by external noise (data pulses with the narrowest pulse width) are excluded from the data pulses to be received. There is an effect that an accurate time correction can be performed.

  In addition, since the data pulse to be received includes a plurality of types of data pulses such as 0 data pulse and 1 data pulse, the data pulse to be received and the adjacent data pulse are the same, resulting in confusion. Such a situation can be avoided relatively easily. Thereby, there is an effect that the time can be corrected without error.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing an internal configuration of a radio timepiece according to an embodiment of the present invention.

  The radio timepiece 1 of this embodiment has a function of receiving a standard radio wave and automatically correcting the time using a time code, for example, with a watch main body. The radio-controlled timepiece 1 includes a display unit 11 that displays time, a control circuit 10 that performs overall control of the apparatus, a storage unit 12 that stores control data, a control program, and the like, and a plurality of operation buttons. Input means 13, a clock circuit 15 that measures time, an oscillation circuit 14 that supplies a predetermined frequency signal to the clock circuit 15, a power supply 17 such as a battery that supplies an operating voltage to each part, and a standard radio wave , A radio wave receiving IC 20 that receives a standard radio wave and demodulates a time code, a switch circuit SW1 that supplies / cuts off power to the radio wave receiving IC 20, and the like.

  The control circuit 10 is composed of, for example, a microcomputer and the like. The control circuit 10 performs AD conversion on the received signal sent from the radio wave receiving IC 20 and takes in it, a CPU (central processing unit) that executes a control program, and a CPU for working. A RAM (Random Access Memory) that provides a memory space, an I / O circuit that inputs and outputs signals to and from each unit, and the like are provided.

  The radio wave receiving IC 20 includes a tuning circuit 21 that switches the frequency of a standard radio wave to be received, a receiving circuit 22 that performs radio wave reception and time code demodulation processing, and the like. The tuning circuit 21 includes, for example, a switching circuit for switching the tuning capacitor and its connection, and switches the channel of the reception frequency by switching the connection of the tuning capacitor. The reception circuit 22 includes an amplifier that amplifies the reception signal, an automatic gain control circuit that performs gain control, a filter circuit that removes noise components from the reception signal, a detection circuit that demodulates time code, and the like.

  The radio wave receiving IC 20 operates by receiving an operating voltage supplied from the power supply 17. However, for example, the switch circuit SW <b> 1 is switched on and off by the control of the control circuit 10, so that the radio wave receiving IC 20 is in an operating state and a non-operating state. It is possible to switch to. When in the non-operating state, current consumption in the radio wave receiving IC 20 is reduced.

  Next, the operation of the time code reception process in the radio timepiece 1 of this embodiment will be described.

  FIG. 2 is a flowchart showing a processing procedure of normal reception processing executed by the control circuit 10.

  In the radio timepiece 1 of this embodiment, for example, immediately after battery replacement or when there is a specific operation input from the outside, first, radio wave reception in the normal mode is performed, and thereby the year, month, day, hour, minute, and second of the clock circuit 15 are set. The normal reception process to be set is executed.

  In this normal reception process, the time code is received for a plurality of frames (for example, three frames) so that there is no data misrecognition, and if a plurality of frames can be received without error, data setting of the clock circuit 15 is performed based on the data contents. Is.

  When normal reception processing is started, first, an initial value “0” is assigned to a variable N for counting the number of received frames of time code (step Q1), and then reception processing is started to demodulate several data pulses. Then, the rising timing of the received data pulse is synchronized with the reference timing of the data discrimination process (step Q2).

  Next, demodulation of the data pulse and data discrimination are continuously performed to detect the time reference (minute point) (step Q3). The time reference is the frame start point of the time code, that is, the rising point of the marker pulse M where the position marker pulse P0 and the marker pulse M are arranged. When the time reference is detected, a time code for one frame is received (step Q4), and a parity check is performed to check for data errors (step Q5).

  Thereafter, it is confirmed whether or not the reception of the time code is in the second frame or later (step Q6), and if it is in the second or later frame, a comparative evaluation with the previously received time code is performed (step Q7). That is, the data value of the time code received last time is compared, and it is checked whether or not the data value differs by the difference between the time received last time and the time received this time.

  Then, it is determined whether or not there is an error in the parity check in step Q5 and the comparative evaluation in step Q7 (step Q8). If there is no error, the process proceeds to the next step Q9. If there is an error, step Q4 is performed again. Returning to the above, the reception process for the next frame is repeated.

  If there is no error and the process proceeds to the next step, the variable N indicating the number of received frames is updated (step Q9) and whether or not the reception of 3 frames has been completed (step Q10) is performed. If not yet received, the process returns to step Q4 to repeat the process of receiving the next frame. If reception for three frames has been completed, a time correction process is performed in which the value of year / month / day / hour / minute / second is calculated based on the data value of the received time code and the data value of the clock circuit 15 is rewritten with this value ( Step Q11).

  When the time correction is completed, the time for performing the second correction reception process later is set (step S12). The time for performing the second correction reception process is set to an appropriate time such as, for example, one day, half a day later, or the next predetermined time. Then, the normal reception process ends.

  If radio wave reception in the normal mode is successful, the mode shifts to the second correction mode from the next time. The clock circuit 15 causes only a small error such as a daily difference of 0.5 seconds or less due to the accuracy of the oscillation circuit 14. For this reason, once the hour is corrected, there will be no time lag even if the radio wave is not received for about one month thereafter. Therefore, once the radio wave reception in the normal mode is successful, the radio wave reception process in the second correction mode (referred to as the second correction reception process) is started from the next radio wave reception process to the second correction mode in which only the second correction is performed. Execute. The second correction is a correction of the exact minute (X minute 00 seconds) of the time measurement data of the clock circuit 15.

  FIG. 3 is an explanatory diagram illustrating an example of a reception interval in the second correction reception process, and FIG. 4 is an explanatory diagram illustrating an example of a method for shifting the reception interval a plurality of times.

  The second correction reception process is performed in five reception intervals W0a to W4a (or shifted reception intervals) corresponding to five data positions where it is known that 0 data pulse and 1 data pulse are received in the time code. Data pulses are received in W0b to W4b), and if these five data pulses match the known data, the second is corrected based on the data pulses.

  Here, the five data positions to be received are, for example, the 8th second point, the 14th second point, the 24th second point, and the 37th second of the time code in the time period indicated by the clock circuit 15 indicating an odd number. The point is set at the 58th second point.

  The data position of the eighth second point is a data position where a code representing “+1 minute” of minute data is arranged. Therefore, one data pulse is arranged in an odd number. In the data pulse at the eighth second point, 0 data pulse or 1 data pulse is arranged on the left side of the data pulse, and the position marker pulse P1 is arranged on the right side of the data pulse. Accordingly, the data pulse at the eighth second point is less likely to be confused with the adjacent data pulse as compared with the case where the 0 data pulse is fixedly arranged on both sides.

  The data position at the 37th second point is the data position where the second parity bit PA2 is arranged. The second parity bit PA2 represents an even parity of minute data from the second second point to the eighth second point, and becomes a 0 data pulse or a 1 data pulse depending on the data value. The value of the data pulse can be calculated by the CPU of the control circuit 10 performing a predetermined calculation process based on the value of the minute data of the clock circuit 15, for example. Therefore, if it is calculated by calculation processing to be one data pulse, the data pulse to be received at the 37th second point becomes one data pulse, and if it is calculated by calculation processing to be 0 data pulse, it is the 37th second. A data pulse to be received at a point is a 0 data pulse.

  The remaining data positions of the 14th, 24th, and 58th seconds are data positions where 0 data pulses are fixedly arranged. On both sides of the 14th and 24th points, the 0 data pulse and 1 data pulse appear unrelated to each other depending on the time data and the total date data, so compared to the case where the fixed 0 data pulse is adjacent, These zero data pulses at the 14th and 24th seconds are not likely to be confused with the adjacent data pulses.

  Also, the left neighbor of the 58th second point is fixed at 0 data pulse, but the right neighbor is fixed at the position marker pulse P0. Therefore, the confusion between the 0th data pulse at the 58th second point and the right data pulse is confused. It is hard to occur.

  In the second correction reception process, as shown in FIG. 3, the control circuit 10 estimates the five data positions to be received as described above, and five reception sections W0a to W4a (or reception sections W0b to W4b) corresponding thereto. Set. Each of the reception sections W0a to W4a and W0b to W4b is set as a section having a time length that includes a one-second section that is a data position to be received at the center and has a slight margin before and after. The length of the reception sections W0a to W4a is preferably set to a length of about 1.8 seconds to 2.2 seconds, more preferably about 2.0 seconds so that one data pulse is surely contained.

  In the first reception process, the control circuit 10 first estimates the data position to be received in accordance with the time measurement data of the clock circuit 15, and sets five reception sections W0a to W4a based on this estimation. Then, reception processing is performed so that data pulses in the reception sections W0a to W4a can be acquired, and data pulses included in the reception sections W0a to W4a are acquired. This reception processing is performed during a period in which the time measurement data of the clock circuit 15 indicates an odd number so that the data pulse at the eighth second point becomes one data pulse. Whether the received data pulse is the data pulse train “10010” (or “10000”) at the 8th, 14th, 24th, 37th, and 58th second points to be received. Check.

  Here, if the clock data of the clock circuit 15 has a deviation within ± 0.5 seconds, the set reception sections W0a to W4a are the 8th, 14th, 24th, This corresponds to the period including the data position of the 37th and 58th seconds. Therefore, in this case, the reception target data pulse train “10010” (or “10000”) is received and confirmed by reception of the receiving sections W0a to W4a. Based on this confirmation, the control circuit 10 can recognize that, for example, the 0 data pulse received in the last reception interval W4a is the data at the 58th second point. As (X minute 00 seconds), the second data of the clock circuit 15 can be corrected.

  On the other hand, when the clock data of the clock circuit 15 is shifted by 1 second or more, as shown in FIG. 3, the set reception intervals W0a to W4a are the 8th, 14th, and 24th seconds to be received. This is a period out of the data position of the point, the 37th point, and the 58th point. In this case, a data pulse train (for example, “P010P”) that is different from the data pulse train “10010” (or “10000”) to be received is received and received by receiving the receiving sections W0a to W4a.

  When the expected data pulse train is not received, the control circuit 10 shifts the estimated data position to be received by about 1 second, and resets the new reception sections W0b to W4b corresponding thereto. That is, new reception sections W0b to W4b are reset by shifting the first reception sections W0a to W4a in the same direction for about 1 second. Then, another data pulse reception process is performed in the new reception sections W0b to W4b, and the 8th, 14th, 24th, 37th, and 58th points of the reception target are received. It is confirmed whether the data pulse train “10010” (or “10000”) is received. This reception process is also performed during a period in which the time measurement data of the clock circuit 15 indicates an odd number so that the data pulse at the eighth second point becomes one data pulse.

  As shown in FIG. 3, the reception sections W0b to W4b shifted in this way are the data positions of the 8th, 14th, 24th, 37th, and 58th points to be received. Since the data pulse train “10010” (or “10000”) to be received is received by the reception processing in these reception sections W0b to W4b, the clock circuit 15 is thereby received as described above. The second data can be corrected.

  On the other hand, if the expected data pulse train “10010” (or “10000”) cannot be acquired from the newly set reception intervals W0b to W4b, the resetting of such reception intervals and the data pulse of each reception interval are performed. The reception process in which the expected data pulse train “10010” (or “10000”) is obtained is repeated by repeating the above acquisition process a plurality of times. Then, when an expected data pulse train can be obtained, the correct minute point in the time measurement data of the clock circuit 15 is corrected based on the data pulse.

  Here, when the resetting of the reception interval is repeated a plurality of times, for example, as shown in FIG. 4, the reception interval may be shifted by about 1 second before and after the front and rear. The example of FIG. 4 shows reception intervals W3a to S3e corresponding to the data position of the 37th second point. The first reception interval W3a is centered on the period of time data of 37 seconds to 38 seconds of the clock circuit 15. The second receiving section W3b is set to a section shifted forward by 1 second, the third receiving section W3c is set to a section shifted backward by 1 second, and the fourth receiving section W3d is set to The interval shifted forward by 2 seconds is set, and the fifth reception interval W3e is set shifted by 2 seconds backward. By resetting the reception interval in this manner, even if the time measurement data of the clock circuit 15 is shifted in the advance direction or the delay direction, the reception interval corresponding to this shift can be reset again.

  On the other hand, if the expected data pulse train “10010” (or “10000”) cannot be received even if the reception process is repeated a predetermined number of times by sliding the reception interval, it is determined that a reception error has occurred and the second correction is not performed. If the reception error continues for a predetermined number of days, or if the second correction mode is difficult to cope with, it shifts to the normal reception mode.

  FIG. 5 shows a flowchart of the second correction reception process executed by the control circuit 10.

  The second correction reception process as described above is realized by the following control process of the CPU of the control circuit 10. That is, when the process proceeds to the second correction reception process, first, the CPU of the control circuit 10 waits until the set time for executing the second correction reception process (step Q21), and proceeds to the process for correcting the second when the set time is reached. To do. That is, first, the radio wave receiving IC 20 is operated to acquire data pulses in the reception sections W0 to W4 (the first time, the tree branches W0a to W4a), and the data pulses in these reception sections W0 to W4 are acquired (steps). Q22).

  Here, the control circuit 10 performs a control process for switching the radio wave receiving IC 20 to an inactive state during a period that is not necessary for acquiring the data pulses included in the reception sections W0 to W4. This reduces unnecessary power consumption. For example, if a predetermined time is required until stable reception data is obtained after the radio wave reception IC 20 is activated, the radio wave reception IC 20 is activated at a timing earlier by this time to obtain a data pulse in the reception section. When the pulse is acquired, control is performed to stop the radio wave receiving IC 20.

  When each data pulse of the plurality of receiving sections W0 to W4 is acquired, it is confirmed whether these are the expected data pulse train “10010” (or “10000”) (step Q23), and if so, according to this data pulse As described above, the correct time of the clock circuit 15 is corrected (step Q24). When the second correction is performed, the receiving sections W0 to W4 may be slid and reset, so that the reset state is returned to the initial state (step Q25), and the next second The reception time in the correction mode is set (step Q26), and the process returns to step Q21 again and waits until the next reception time.

  On the other hand, if it is determined in step Q23 that the expected data pulse train has not been received, it is determined whether this reception failure has occurred a predetermined number of times (for example, within 5 times) (step Q27). First, the receiving sections W0 to W4 are shifted by 1 second, for example, in the manner shown in FIG. 4 and reset (step Q28), wait for one minute to receive odd-numbered reception (step Q29), and step again It repeats from the reception process of Q22.

  When the expected data pulse train cannot be received by the loop processing of steps Q22, Q23, and Q27 to Q29 as described above, the receiving sections W0 to W4 are shifted by 1 second and the receiving process is repeated. It will be.

  In addition, when the reception failure has exceeded the predetermined number of times in the determination process of step Q27 and the process has shifted to the No side, first, it is confirmed whether the reception failure has not continued for 7 consecutive days (step Q30). If there is, for example, it is determined that the radio wave condition is bad and normal reception cannot be performed at the current timing, and the process jumps to Step Q25. As a result, it waits until the next reception time, and when the next reception time is reached, the reception process is performed using the reception sections W0 to W4 in the initial state.

  On the other hand, if the reception failure has continued for more than 7 days in the determination process of step Q30, it is determined that the normal time cannot be corrected anymore in the second correction mode reception process, and the reception time setting for the normal reception mode is set. (Step Q31), the second correction reception process is exited and the normal reception mode is entered. As a result, the normal reception process of FIG. 2 is executed at the next set time.

  As described above, according to the radio timepiece 1 and the radio wave receiver (control circuit 10, clock circuit 15, radio wave receiving IC 20) of this embodiment, a data pulse in a part of the time code is received. Since the time adjustment is performed, for example, the operation of the radio wave reception IC 20 is stopped in other unnecessary sections, so that power consumption for the time adjustment can be reduced.

  In addition, since the marker pulse M and the position marker pulses P0 to P5 that are easily affected by external noise are excluded from the data pulse to be received, the data pulse is normally received and the signal pulse is normally received even when the radio wave condition is somewhat bad. Time adjustment can be performed.

  Here, the point that the data pulse having a wider pulse width is less susceptible to external noise than the marker pulse M and the position marker pulses P0 to P5 will be described. FIG. 6 is a waveform diagram for explaining the influence of external noise on the position marker pulse, and FIG. 7 is a waveform chart for explaining the influence of external noise on the 0 data pulse. 6 and 7, (a) shows an example of the signal waveform, and (b) shows an example of a waveform of determination data processed for data determination in the control circuit 10.

  In the marker pulse M having a narrow pulse width, as shown in FIGS. 6A and 6B, when pulsed external noises N1 and N2 are mixed in the signal, the signals of the mixed portions of the external noises N1 and N2 are mixed. Since the level is increased, the external noise N1 and N2 portions are also determined to be at a high level during the data type determination processing by the control circuit 10, thereby causing a situation where the marker pulse M is not correctly determined. For example, in the case of FIGS. 6A and 6B, it is erroneously determined as one data pulse.

  On the other hand, in the case of a data pulse having a wide pulse width such as 0 data pulse, as shown in FIGS. 7A and 7B, even when pulsed external noises N1 and N2 are mixed, the signal waveform may be changed. Since it is small, it does not greatly affect the determination of the data type.

  Therefore, the radio wave condition is somewhat bad by excluding the marker pulse M having a narrow pulse width and the position marker pulses P0 to P5 and receiving only 0 data pulse or 1 data pulse having a wide pulse width and using it for time adjustment. By the way, normal reception processing and time correction processing are possible.

  In addition, since the data pulse to be received by the five receiving sections W0 to W4 includes not only the 0 data pulse but also 1 data pulse, the data pulse to be received and the adjacent data pulse, for example, are the same. It is relatively easy to avoid the situation of confusion. Thereby, time correction without a mistake can be performed.

  If the expected data pulse train cannot be acquired from the five reception sections W0 to W4, the reception sections W0 to W4 are slid and reset, and the newly set reception sections W0 to W4 are set again. Since reception processing is performed, even when the second data of the clock circuit 15 is shifted by several seconds, the reception sections W0 to W4 corresponding to this shift can be found and correct second correction processing can be performed.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, in the above embodiment, the data position to be received is set to the 8th, 14th, 24th, 37th, and 58th seconds of the time code in the odd minutes. As long as it is known that four or more data positions are known to be transmitted as one data pulse, other data positions may be set as reception targets. For example, in a period in which one data pulse appears in year data or total date data, this one data pulse can be set as a reception target. Further, the control circuit 10 may be configured to select the data position to be received at each reception time in the second correction mode without fixing the data position to be received. That is, the control circuit 10 performs arithmetic processing based on the time data for the date and time of the clock circuit 15 to determine the data positions at a plurality of locations where one data pulse or zero data pulse appears in the time code. The position may be set as a reception target.

  FIG. 8 is an explanatory diagram showing a modification of the reception section in the second correction reception process.

  Further, in the above-described embodiment, it has been described that when the expected data pulse train cannot be acquired, the reception sections W0 to W4 are slid and the reception process is performed again. For example, as illustrated in FIG. If the data pulse train cannot be acquired, the time width of the reception sections W0 to W4 may be widened to perform the reception process again. In this case, a plurality of data pulses are acquired in one reception section, but the first data pulse is collected from each of the reception sections W0 to W4 to form a set and a second data pulse train. If a plurality of sets of data pulse trains are acquired at a time, such as a data pulse train that is collected from each receiving section W0 to W4 to form a set, then the same data pulse train as expected can be obtained. good.

  In the above embodiment, it has been described that each of the reception sections W0 to W4 is set to a section of about 2 seconds in which one data pulse is included. However, the reception sections W0 to W4 are set to two or three data pulses. You may set widely beforehand so that it may be included. Also, since the second data of the clock circuit 15 increases in error time with time, the elapsed time from the previous successful reception of radio waves and second correction is obtained, and the reception interval increases as this elapsed time increases. You may make it set so that the section length of W0-W4 may also become long. Even in such a case, it can be confirmed whether the expected data pulse train is included by the same method as described above.

  In addition, the detailed configuration and method shown in the embodiment can be appropriately changed without departing from the spirit of the invention.

It is a block diagram which shows the internal structure of the radio timepiece of embodiment of this invention. It is a flowchart which shows the process sequence of the normal reception process performed by the control circuit. It is explanatory drawing showing an example of the reception area in a second correction reception process. It is explanatory drawing showing the example of a system in the case of shifting a receiving area in multiple times in second correction reception processing. It is a flowchart which shows the process sequence of the second correction reception process performed by the control circuit. It is a wave form diagram explaining the influence of the external noise with respect to a data pulse with a small pulse width. It is a wave form diagram explaining the influence of the external noise with respect to a data pulse with a big pulse width. It is explanatory drawing which shows the modification of the receiving area in a second correction reception process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Radio wave clock 10 Control circuit 11 Display means 12 Memory | storage means 13 Input means 14 Oscillation circuit 15 Clock circuit 17 Power supply SW1 Switch circuit 19 Antenna 20 Radio wave reception IC
21 Tuning Circuit 22 Receiving Circuit W0 to W4 First to Fifth Reception Intervals W0a to W4a First to Fifth Reception Intervals in Initial State W0b to W4b Slided First to Fifth Reception Intervals

Claims (5)

In a radio wave receiver that receives a time code in which a plurality of types of data pulses having different pulse widths are arranged,
Receiving means for receiving a standard radio wave and detecting the time code from the standard radio wave;
A time measuring means for measuring time;
Corresponds to four or more data pulse positions where it is known that two or more types of data pulses other than the data pulse having the narrowest pulse width among the plurality of types of data pulses are arranged in the time code. Reception control means for causing the reception means to perform time code reception processing in each reception section;
When the data pulse received in the reception section is the same as the known data pulse, time correction means for correcting the minute part of the time measuring means based on the received data pulse;
Equipped with a,
The plurality of types of data pulses are composed of a marker data pulse representing a frame position of a time code, a 0 data pulse representing a binary data, and a 1 data pulse,
The reception section is set to a section corresponding to four or more data pulse positions where it is known that the 0 data pulse and the 1 data pulse are arranged, and the time measuring means indicates an odd number. And a section corresponding to the data pulse positions of the 8th, 14th, 24th, and 58th seconds of the time code . In a radio wave receiver that receives a time code in which a plurality of types of data pulses having different pulse widths are arranged,
Receiving means for receiving a standard radio wave and detecting the time code from the standard radio wave;
A time measuring means for measuring time;
Corresponds to four or more data pulse positions where it is known that two or more types of data pulses other than the data pulse having the narrowest pulse width among the plurality of types of data pulses are arranged in the time code. Reception control means for causing the reception means to perform time code reception processing in each reception section;
When the data pulse received in the reception section is the same as the known data pulse, time correction means for correcting the minute part of the time measuring means based on the received data pulse;
With
The reception control means includes
Radio wave reception characterized in that, if a data pulse received in the reception section is not a known data pulse, the position of the reception section is slid back and forth, and reception processing in the reception section is performed again. apparatus. In a radio wave receiver that receives a time code in which a plurality of types of data pulses having different pulse widths are arranged,
Receiving means for receiving a standard radio wave and detecting the time code from the standard radio wave;
A time measuring means for measuring time;
Corresponds to four or more data pulse positions where it is known that two or more types of data pulses other than the data pulse having the narrowest pulse width among the plurality of types of data pulses are arranged in the time code. Reception control means for causing the reception means to perform time code reception processing in each reception section;
When the data pulse received in the reception section is the same as the known data pulse, time correction means for correcting the minute part of the time measuring means based on the received data pulse;
With
The reception control means includes
When the data pulse received in the receiving section is not a known data pulse, the time width of the receiving section is widened, and the reception processing in the receiving section is performed again . The reception control means includes
The control unit is configured to operate the reception unit so that the data pulse of the reception period can be acquired and to stop the reception unit during a period unnecessary for acquiring the data pulse of the reception period . 4. The radio wave receiver according to any one of 3 above. A built-in radio wave receiving apparatus according to any one of claims 1 to 4,
A radio timepiece that corrects the time of an internal timepiece based on a time code received by the radio wave receiver.

Images