JP5625977B2 - Time receiver, radio wave correction clock, and encoding method - Google Patents

Description

  The present invention relates to a time receiving device, a radio-controlled timepiece, and an encoding method.

  Conventionally, radio wave correction that receives long wave standard radio waves (hereinafter may be abbreviated as “standard radio waves”), acquires time information (time code) included in the standard radio waves, and corrects internal time information held inside A timepiece (radio timepiece) is known (see, for example, Patent Document 1).

  The radio timepiece described in Patent Document 1 is configured to be able to receive standard radio waves from Japan and the United States of America, and encodes a received signal based on a signal waveform within one second from the rise or fall time of the demodulated signal. . Specifically, in the radio timepiece, when receiving a Japanese standard radio wave, the A section from 1/32 seconds to 5/32 seconds from the rising edge of the demodulated signal, 8/32 seconds to 13/32 seconds or less. B section and C section of 18/32 seconds or more and 23/32 seconds or less. The radio timepiece determines “0” if the voltage level of the received signal is “High” in each of the A section, the B section, and the C section, and “High” in the A section and the B section. If it is “Low”, it is determined as “1”, and if it is “High” in the A section and “Low” in the B and C sections, it is determined as “P”, and the demodulated signal is encoded. The radio timepiece extracts time information from the encoded data, corrects the internal time information, and displays the corrected time on the display unit.

JP 2009-168825 A

However, in the radio timepiece described in Patent Document 1, it is necessary to refer to the voltage levels of the A section, the B section, and the C section, respectively, when encoding the demodulated signal. There is a problem that the process of encoding time data becomes complicated.
Also, in Japanese standard radio waves, the voltage level of the above-mentioned A section in the demodulated signal is always “High”. May become “Low”. In such a case, it is determined that the corresponding bit is an error, and the processing related to the bit is terminated. For this reason, there is a problem that the reception time becomes longer due to erroneous reception or reception of the standard radio wave again. In addition, when the number of reception processing and encoding processing within a predetermined time is set in advance due to power consumption or the like, if the time data cannot be appropriately acquired from the standard radio wave within the number of times, the time data is There is a problem that the reception process and the encoding process end without being acquired.

  An object of the present invention is to provide a time receiving device, a radio-controlled timepiece, and an encoding method that can appropriately acquire time data, in addition to simplifying the encoding process of a demodulated signal.

The time receiver of the present invention includes a receiving means for receiving a standard radio wave including time data composed of frames, and a demodulated signal of the standard radio wave received by the receiving means is encoded for each bit of the time data. Encoding means for obtaining the time data; and start position determination means for determining a start position of the frame based on the time data encoded by the encoding means, the encoding means Changes the coding condition of the demodulated signal before and after the start position is determined by the start position determination means, and corresponds to one bit of the time data before the start position is determined Based on the voltage levels of a plurality of periods set as the input period of the demodulated signal, the demodulated signal is encoded into three types of “0”, “1”, “P”, and “M”, and the start position is determined. After being based on the voltage level of one period of said plurality period, characterized by coding the demodulated signal into two types of "0" and "1".

The time data included in the standard radio wave indicates a time code corresponding to the standard radio wave, and the frame indicates a 60-bit time code. The demodulated signal indicates a TCO (Time Code Out) signal obtained by demodulating a standard radio wave.
According to the present invention, the encoding condition of the demodulated signal by the encoding means is changed before and after the start position of the frame is determined by the start position determining means. Here, when the start position of the frame is determined, it is necessary to acquire (detect) the positions of the marker “M” and the position marker “P” in the frame, but after the start position is determined, The positions of “M” and “P” are not so important in the time data of one frame.

  For this reason, for example, after the start position of the frame is determined, the demodulated signal is not encoded into “M” and “P” from the encoding conditions before the determination, but other data (for example, Japanese standard radio wave “JJY” In other words, the reference condition is reduced by changing the encoding condition to "0" and "1"). Thereby, the encoding process of the demodulated signal by the encoding means can be simplified. Therefore, after the start position of the frame is determined, the demodulated signal encoding process can be simplified.

In addition, in the above example of Japanese standard radio waves, the demodulated signal encoded to “1” is not properly demodulated due to the influence of noise or the like, and the inversion position of the voltage level is changed to the position marker “P”. There may be a demodulated signal close to the signal waveform to be encoded. If this demodulated signal is encoded to “P”, it is recognized as an error. And it is judged that it is erroneous reception, and it becomes necessary to receive the standard radio wave again, and the reception time (the time required to acquire time data) becomes longer.
On the other hand, after the start position of the frame is determined, the demodulated signal is not encoded into “M” or “P”, but is encoded into “0” or “1”, thereby “1”. The demodulated signal to be encoded can be prevented from being encoded to “P”. Therefore, since the occurrence of an error can be prevented, time data can be appropriately acquired without increasing the reception time.

The period referred to by the encoding means after the start position is determined is a voltage between the signal waveform encoded to “0” and the signal waveform encoded to “1” in the demodulated signal. It can be a period in which the level is different.
According to the present invention, the encoding means outputs the demodulated signal based on the voltage levels of a plurality of periods set in the input period of the demodulated signal corresponding to 1 bit of the time data before the start position of the frame is determined. Encode into 3 types. On the other hand, after the start position is determined, the encoding unit encodes the demodulated signal into two types based on the voltage level of one period among the plurality of periods. According to this, since the period referred to by the encoding unit can be reduced after the start position is determined, the determination process of the demodulating signal encoding unit can be reliably simplified.

  In addition, after the start position of the frame is determined, the demodulated signal is divided into two types of “0” and “1” based on the voltage level of one period among a plurality of periods referred to before the start position is determined. Encode. According to this, even if the waveform of the demodulated signal encoded to “0” or “1” becomes close to the waveform of the demodulated signal encoded to “P” due to the influence of noise or the like, “P” Can be reliably encoded into the “0” or “1”. Therefore, the occurrence of an error can be reliably prevented, and the time data can be acquired more appropriately without increasing the reception time.

  In the present invention, the receiving unit is configured to receive Japanese standard radio waves, and the encoding unit encodes a demodulated signal of Japanese standard radio waves after the start position is determined. Based on the voltage level of the demodulated signal in the period from 18/32 seconds to 23/32 seconds from the start timing of the input period, the demodulated signal is encoded into two types of “0” and “1” Is preferred.

  In the case of the Japanese standard radio wave “JJY”, the start timing of the input period of the demodulated signal corresponding to 1-bit time data is indicated by the rising edge of the voltage. However, depending on the configuration of the receiving means, the voltage change is reversed. (I.e., indicated by a falling voltage).

In the case of the Japanese standard radio wave “JJY”, the demodulated signal encoded to “0” and the demodulated signal encoded to “1” are 16/32 from the start timing of the signal for 1 bit in the demodulated signal. A difference occurs in the voltage level in a period of from 2 seconds to 25/32 seconds.
Therefore, in the present invention, the demodulated signal is surely encoded to “0” or “1” by encoding based on the voltage level in the period of 18/32 seconds or more and 23/32 seconds or less from the start timing. it can.
Also, there is a time margin between the voltage change timing of the demodulated signal (as described above, it can be rising or falling depending on the configuration of the receiving means) and the period during which the voltage level is determined by the encoding means. Therefore, even when the voltage change timing is shifted due to the influence of noise or the like, the demodulated signal can be appropriately encoded to “0” or “1”. Therefore, the demodulated signal can be reliably and appropriately encoded.

Here, in the case of the standard radio wave “JJY”, if the voltage change timing that is not the start timing in the demodulated signal encoded to “1” is shifted to the start timing side, the demodulation is encoded to “P”. The waveform of the signal, that is, the signal waveform having the voltage change timing is close to 6/32 seconds to 7/32 seconds after the start timing.
On the other hand, in the present invention, the voltage level is determined by the encoding means between each demodulated signal encoded to “0” and each voltage change timing that is not the start timing in the demodulated signal encoded to “1”. There is a period during which is determined. According to this, even when the voltage change timing of the demodulated signal encoded to “1” is shifted to the start timing side due to the influence of noise or the like, the demodulated signal is surely set to “1” instead of “P”. Can be encoded. Therefore, the occurrence of an error can be prevented more reliably, and time data can be acquired more appropriately without increasing the reception time.

  In the present invention, the receiving means is configured to receive a standard radio wave of the United States of America, and the encoding means encodes a demodulated signal of the standard radio wave of the United States of America, after the start position is determined. Based on the voltage level of the demodulated signal in the period from 8/32 seconds to 13/32 seconds from the start timing of the input period, the demodulated signal is encoded into two types of “0” and “1” Is preferred.

  In the case of the United States standard radio wave “WWVB”, the start timing of the input period of the demodulated signal corresponding to 1-bit time data is indicated by the fall of the voltage. However, depending on the configuration of the receiving means, the voltage may change. In some cases (ie, indicated by a rising voltage).

In the case of the standard radio wave “WWVB” of the United States of America, the demodulated signal encoded to “0” and the demodulated signal encoded to “1” are 7/32 from the start timing of the 1-bit signal in the demodulated signal. A difference occurs in the voltage level in a period of at least 1 second and less than 16/32 seconds.
Therefore, in the present invention, the demodulated signal is surely encoded to “0” or “1” by encoding based on the voltage level of the period from 8/32 seconds to 13/32 seconds from the start timing. it can.
Also, there is a time margin between the voltage change timing of the demodulated signal (as described above, it can be rising or falling depending on the configuration of the receiving means) and the period during which the voltage level is determined by the encoding means. Therefore, as in the case of the Japanese standard radio wave described above, the demodulated signal can be appropriately encoded to “0” or “1” even when the voltage change timing is shifted due to noise or the like. Therefore, the demodulated signal can be reliably and appropriately encoded.

Here, in the case of the standard radio wave “WWVB”, when the voltage change timing which is not the start timing in the demodulated signal encoded as “1” is shifted to the next start timing side, it is encoded as “P”. The waveform of the demodulated signal, that is, a signal waveform having the voltage change timing between 25/32 seconds and 26/32 seconds after the start timing.
On the other hand, in the present invention, the voltage level is determined by the encoding means between each demodulated signal encoded to “0” and each voltage change timing that is not the start timing in the demodulated signal encoded to “1”. There is a period during which is determined. According to this, as in the case of the Japanese standard radio wave described above, even when the voltage change timing of the demodulated signal encoded as “1” is shifted to the next start timing side due to the influence of noise or the like, The demodulated signal can be reliably encoded to “1” instead of “P”. Therefore, the occurrence of an error can be prevented more reliably, and time data can be acquired more appropriately without increasing the reception time.

  In the present invention, the receiving means is configured to be able to receive a German standard radio wave, and the encoding means encodes a demodulated signal of the German standard radio wave after the start position is determined. Based on the voltage level of the demodulated signal in the period from 4/32 seconds to 5/32 seconds from the start timing of the input period, the demodulated signal is encoded into two types of “0” and “1” Is preferred.

  In the case of the German standard radio wave “DCF77”, the start timing of the input period of the demodulated signal corresponding to 1-bit time data is indicated by the falling of the voltage. However, depending on the configuration of the receiving means, the voltage may change. In some cases (ie, indicated by a rising voltage).

In the case of the German standard radio wave “DCF77”, the demodulated signal encoded to “0” and the demodulated signal encoded to “1” are 3/32 from the start timing of the signal for one bit in the demodulated signal. In the period exceeding 2 seconds and not exceeding 6/32 seconds, a difference occurs in the voltage level.
Therefore, in the present invention, the demodulated signal is surely encoded to “0” or “1” by encoding based on the voltage level of the period from 4/32 seconds to 5/32 seconds from the start timing. it can.
In addition, since there is a time margin between the voltage change timing of the demodulated signal and the period during which the voltage level is determined by the encoding means, as in the case of the standard radio waves in Japan and the United States described above, the influence of noise and the like. Thus, even when the voltage change timing is shifted, the demodulated signal can be appropriately encoded to “0” or “1”. Therefore, the demodulated signal can be reliably and appropriately encoded.

Here, in the case of the standard radio wave “DCF77”, when the voltage change timing which is not the start timing in the demodulated signal encoded to “0” is shifted to the start timing side, the demodulation is encoded to “M”. The waveform of the signal, that is, the voltage waveform is close to a constant signal waveform.
On the other hand, in the present invention, the voltage level is determined by the encoding means between each demodulated signal encoded to “0” and each voltage change timing that is not the start timing in the demodulated signal encoded to “1”. There is a period during which is determined. According to this, as in the case of the above-mentioned standard radio waves in Japan and the United States of America, even when the voltage change timing of the demodulated signal encoded as “0” is shifted to the start timing side due to the influence of noise or the like, The demodulated signal can be reliably encoded to “0” instead of “M”. Therefore, the occurrence of an error can be prevented more reliably, and time data can be acquired more appropriately without increasing the reception time.

  In the present invention, the receiving means is configured to be able to receive a British standard radio wave, and when the encoding means encodes a demodulated signal of the British standard radio wave, before the start position is determined. , Based on the voltage level of four or more periods set in the input period of the demodulated signal corresponding to one bit of the time data, the demodulated signal is set to “00”, “01”, “10”, After the encoding is made into five types “11” and “M” and the start position is determined, the demodulated signal is converted to “00” based on the voltage levels of three of the four or more periods. ”,“ 01 ”or“ 10 ”, and“ 11 ”.

  Among these, signals encoded as “10” and “11” are signals that are exceptionally used for bits 53 to 58 in the format of the British standard radio wave “MSF”. In order to distinguish from bits other than these exceptions, a signal indicating “00” (a signal that is at a low level for 0.1 second and then at a high level for 0.9 second) is determined to be “0”, and “01”. (A signal that is at a low level for 0.2 seconds and then is at a high level for 0.8 seconds thereafter) is determined to be “1”. A signal indicating “10” (low level for 0.2 seconds and then high level for 0.8 seconds) is determined to be “0”, and a signal indicating “11” (low level for 0.3 seconds). The signal that is at the level and is at the high level for 0.7 seconds thereafter is determined to be “1”. Depending on the configuration of the receiving means, the low level and the high level may be reversed.

  According to the present invention, as described above, the encoding means is operable to determine the voltage level of four or more periods set in the input period of the demodulated signal corresponding to one bit of the time data before the frame start position is determined. Based on the above, the demodulated signal is encoded into five types. In addition, after the start position is determined, the encoding unit encodes the demodulated signal into three types based on the voltage levels of the three periods among the plurality of periods. According to this, since the referenced period is reduced, the determination process of the encoding means can be reliably simplified.

  In addition, after the start position of the frame is determined, the demodulated signal is set to “00” and “01” or “10” based on the voltage levels of three periods among a plurality of periods referred to before the start position is determined. ”And“ 11 ”. According to this, even when the waveform of the demodulated signal is close to the waveform of the demodulated signal encoded to “M” due to the influence of noise or the like, “00” is encoded without being encoded to “M”. It is possible to reliably encode either “01” or “10” or “11”. Therefore, the occurrence of an error can be reliably prevented, and the time data can be acquired more appropriately without increasing the reception time.

The time receiver of the present invention includes a receiving means for receiving a standard radio wave including time data composed of frames, and a demodulated signal of the standard radio wave received by the receiving means is encoded for each bit of the time data. Encoding means for acquiring the time data; and start position determination means for determining a start position of the frame based on the time data encoded by the encoding means; and the reception means The standard signal of the United Kingdom is configured to be received, and the encoding unit changes the encoding condition of the demodulated signal before and after the start position is determined by the start position determination unit. When encoding a radio wave demodulated signal, before the start position is determined, the demodulated signal input period corresponding to 1 bit of the time data is set to 4 or more. The demodulated signal is encoded into five types of “00”, “01”, “10”, “11”, and “M” based on the voltage level between them, and the start position is determined. After that, the demodulated signal is encoded into three types of “00”, “01” or “10”, and “11” based on the voltage level of three of the four or more periods. It is characterized by that.
In the present invention, in the case of encoding a demodulated signal of a British standard radio wave, the encoding means is 1/32 second or more from the start timing of the input period after the start position is determined. Based on the voltage level of the demodulated signal in each of a period of 2 seconds or less, a period of 4/32 seconds or more and 5/32 seconds or less, and a period of 8/32 seconds or more and 9/32 seconds or less, It is preferable to encode into three types of “00”, “01” or “10”, and “11”.

  In the case of the British standard radio wave “MSF”, the start timing of the input period of the demodulated signal corresponding to 1-bit time data is indicated by the fall of the voltage. However, depending on the configuration of the receiving means, the voltage may change. In some cases (ie, indicated by a rising voltage).

In the case of the British standard radio wave “MSF”, a demodulated signal encoded as “00”, a demodulated signal encoded as “01” or “10”, and a demodulated signal encoded as “11” In the demodulated signal, a difference in voltage level occurs in a period exceeding 3/32 seconds and 9/32 seconds or less from the start timing of the signal for 1 bit.
More specifically, in the demodulated signal encoded as “00”, the voltage level is inverted in a period until 3/32 seconds have elapsed from the start timing and in a period after the period. On the other hand, in the demodulated signal encoded as “01” or “10”, the voltage level is inverted between a period of 6/32 seconds or less from the start timing and a period after the period. Further, in the demodulated signal encoded as “11”, the voltage level is inverted between a period of 9/32 seconds or less from the start timing and a period after the period.

Therefore, in the present invention, a period of 1/32 seconds to 2/32 seconds or less from the start timing, a period of 4/32 seconds to 5/32 seconds, and 8/32 seconds to 9/32 seconds or less. The demodulated signal is encoded based on the voltage level of each demodulated signal in the period. According to this, the demodulated signal can be reliably encoded into any one of “00”, “01”, “10”, and “11”.
Also, there is a time margin between the voltage change timing of the demodulated signal (as described above, it can be rising or falling depending on the configuration of the receiving means) and the period during which the voltage level is determined by the encoding means. Therefore, as in the case of the standard radio waves of Japan, the United States of America, and Germany, the demodulated signal can be appropriately encoded even when the voltage change timing is shifted due to the influence of noise or the like. Therefore, the demodulated signal can be reliably and appropriately encoded.

Here, in the case of the standard radio wave “MSF”, if the voltage change timing that is not the start timing in the demodulated signal encoded to “11” is shifted to the next start timing side, it is encoded to “M”. The waveform of the demodulated signal, that is, a signal waveform having a voltage change timing is close to 16/32 seconds after the start timing.
On the other hand, in the present invention, a period of less than 16/32 seconds from the start timing, that is, a period of 1/32 seconds or more and 2/32 seconds or less from the start timing, a period of 4/32 seconds or more and 5/32 seconds or less. In addition, a period in which the voltage level is determined by the encoding unit is provided in a period from 8/32 seconds to 9/32 seconds. According to this, the voltage change timing that is not the start timing of the demodulated signal encoded as “11” is set to the next start timing side due to the influence of noise or the like, as in the case of the standard radio waves of Japan, the United States, and Germany. Even in the case of approaching, the demodulated signal can be reliably encoded to “11” instead of “M”. Therefore, the occurrence of an error can be prevented more reliably, and time data can be acquired more appropriately without increasing the reception time.

Further, the radio-controlled timepiece of the present invention includes the above-described time receiving device, time correcting means for correcting the internal time based on the time data acquired by the time receiving device, and a display for displaying the corrected internal time. And means.
According to the present invention, the same effects as those of the above-described time receiving device can be obtained, and the processing of the time receiving device can be simplified, so that the power consumption of the radio-controlled timepiece can be reduced.

The encoding method of the present invention is to encode the demodulated signal of the standard radio wave, a coding method for acquiring time data composed of frames is Ru included in the standard radio, the demodulated signal, wherein An encoding step for encoding each bit of time data to acquire the time data, a start position determination step for determining a start position of the frame based on the acquired time data, and determination of the start position in the front and rear fixed, have a, a condition change step of changing a coding condition of the demodulated signal, said encoding step, before the starting position is determined, corresponding to one bit of the time data The demodulated signal is encoded into three types “0”, “1”, “P”, and “M” based on the voltage levels of a plurality of periods set in the input period of the demodulated signal, and the start position is Confirmed After, based on the voltage level of one period of said plurality period, characterized by coding the demodulated signal into two types of "0" and "1".
According to the present invention, it is possible to achieve the same effect as the above-described time receiving device.

1 is a block diagram illustrating a configuration of a radio-controlled timepiece according to an embodiment of the present invention. The figure which shows an example of the signal waveform of the TCO signal of standard radio wave "JJY". The figure which shows the encoding conditions at the time of encoding a TCO signal before the start position determination of the flame | frame in the said embodiment. The figure which shows the encoding conditions at the time of encoding a TCO signal after the start position determination of the flame | frame in the said embodiment. The figure which shows the waveform of the appropriate TCO signal, and the waveform of the TCO signal affected by the noise. The flowchart which shows the encoding process in the said embodiment. The figure which shows an example of the signal waveform of the TCO signal of standard radio wave "WWVB". The figure which shows the encoding conditions at the time of encoding a TCO signal before the start position determination of the flame | frame in the said embodiment. The figure which shows the encoding conditions at the time of encoding a TCO signal after the start position determination of the flame | frame in the said embodiment. The figure which shows an example of the signal waveform of the TCO signal of standard radio wave "DCF77". The figure which shows the encoding conditions at the time of encoding a TCO signal before the start position determination of the flame | frame in the said embodiment. The figure which shows the encoding conditions at the time of encoding a TCO signal after the start position determination of the flame | frame in the said embodiment. The figure which shows an example of the signal waveform of the TCO signal of standard radio wave "MSF" The figure which shows the encoding conditions at the time of encoding a TCO signal before the start position determination of the flame | frame in the said embodiment. The figure which shows the encoding conditions at the time of encoding a TCO signal after the start position determination of the flame | frame in the said embodiment.

[Configuration of radio-controlled clock]
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a radio-controlled timepiece 1 according to the present embodiment.
The radio-controlled timepiece 1 according to the present embodiment receives a standard radio wave including time data (time code) composed of frames and demodulates a TCO signal based on the standard radio wave. The radio-controlled timepiece 1 encodes the TCO signal to acquire time data, and corrects the internal time information based on the time data.
Such a radio-controlled timepiece 1 includes an antenna 2, a receiving circuit 3, and a control device 4, as shown in FIG. In addition, the radio-controlled timepiece 1 includes an hour hand 11, a minute hand 12 and a second hand 13 as display means, and further includes a crown 15 and buttons 16 and 17 as operation means.
Among these, the antenna 2, the receiving circuit 3, and the receiving processing means 71 described later of the control device 4 constitute the time receiving apparatus of the present invention, and the antenna 2 and the receiving circuit 3 constitute the receiving means of the present invention. The

[Configuration of receiving circuit]
The receiving circuit 3 receives a standard radio wave via the antenna 2 based on a control signal input from the control device 4, demodulates the received signal corresponding to the standard radio wave, and generates a TCO (Time Code as a demodulated signal). Out) signal is generated. Then, the reception circuit 3 outputs the generated TCO signal to the control device 4. Such a receiving circuit 3 includes a tuning circuit, an amplifier circuit, a band-pass filter, an envelope detection circuit, and the like, although detailed illustration is omitted.
In addition to the Japanese standard radio wave “JJY”, the receiver circuit 3 according to this embodiment includes the standard radio wave “WWVB” of the United States of America, the standard radio wave “DCF77” of Germany, the standard radio wave “MSF” of the United Kingdom, A standard radio wave such as a standard radio wave “BPC” is received in each region.

[Configuration of control device]
The control device 4 controls the operation of the entire radio-controlled timepiece 1 and includes an oscillation circuit 5, a frequency dividing circuit 6, and a control circuit 7.
The oscillation circuit 5 and the frequency dividing circuit 6 are configured as operation clocks that generate and output a reference signal having a predetermined frequency.
Specifically, the oscillation circuit 5 is connected to a reference signal source (not shown) such as a crystal resonator, and the oscillation circuit 5 oscillates the reference signal source at high frequency and divides the oscillation signal generated by the high frequency oscillation. Output to circuit 6.
The frequency dividing circuit 6 divides the input oscillation signal. The frequency divider 6 outputs a predetermined reference signal (for example, a 1 Hz pulse signal) to the control circuit 7.

[Configuration of control circuit]
The control circuit 7 includes an arithmetic processing circuit such as a CPU. The control circuit 7 includes reception processing means 71, reception control means 72, time measuring means 73, external operation control means 74, and display control means 75.
The reception processing unit 71 encodes the TCO signal input from the reception circuit 3 to acquire time data (time code), and outputs the time data to the reception control unit 72. The configuration of the reception processing means 71 will be described in detail later.

The reception control means 72 outputs a control signal to the reception circuit 3 to control the reception operation of the reception circuit 3. Normally, the reception control unit 72 causes the reception circuit 3 to perform a reception operation when the time measured by the time measuring unit 73 reaches a preset reception processing time (for example, 2:00 am).
Further, when the time data input from the reception processing unit 71 is not correct, the reception control unit 72 causes the reception circuit 3 to perform the reception process again after a preset time has elapsed. For example, the reception control unit 72 converts the time data into a time that is not actually possible, such as 25:00 or 65 minutes, or is included in the time data. When incorrect time data is acquired based on the parity, the reception circuit 3 is made to perform the reception process again.

  In addition, when appropriate time data is acquired, the reception control unit 72 corrects the time (internal time) measured by the time measuring unit 73 based on the time data. And the reception control means 72 outputs a control signal to the display control means 75 with the correction of the said time, and makes the display time correct. That is, the reception control means 72 corresponds to the time correction means of the present invention.

The time measuring means 73 measures the internal time based on the reference signal input from the frequency dividing circuit 6. Further, when time information based on time data is input from the reception control means 72, the time measuring means 73 corrects the internal time being timed according to the time information and performs time adjustment.
The external operation control means 74 detects the operation of the crown 15 and the buttons 16 and 17 and instructs control according to the operation. Examples of such control include control for setting the type of standard radio wave received by the antenna 2 and control for performing manual reception processing (forced reception processing) for receiving the standard radio wave and correcting the internal time.

The display control means 75 controls the driving of the pointer comprising the hour hand 11, the minute hand 12 and the second hand 13 based on the control signal output from the reception control means 72. Specifically, the display control means 75 controls the electric motor that drives each pointer based on the internal time measured by the time measuring means 73. That is, in the present embodiment, the display control means 75, the hour hand 11, the minute hand 12, and the second hand 13 constitute the display means of the present invention.
In the present embodiment, the time is displayed using a pointer, but the present invention is not limited thereto, and the time may be displayed using various displays such as liquid crystal, organic EL (Electroluminescence), and electrophoresis.

[Configuration of reception processing means]
The reception processing unit 71 encodes the TCO signal input from the reception circuit 3, acquires a time code of one frame as time data, and outputs the time code to the reception control unit 72. Specifically, the reception processing means 71 processes the TCO signal according to the type of the standard radio wave received, and converts the TCO signal input every second based on the voltage level of the TCO signal into the time code. The time code is acquired by encoding each bit to “P, 1, 0”. Such a reception processing unit 71 includes an encoding unit 711 and a start position determination unit 712.

FIG. 2 is a diagram illustrating signal waveforms of “0”, “1”, and “P” in the Japanese standard radio wave “JJY”.
First, the encoding unit 711 detects the start timing of the TCO signal input from the receiving circuit 3 based on the type of the received standard radio wave, and performs second synchronization processing. For example, when the antenna 2 and the receiving circuit 3 receive the Japanese standard radio wave “JJY” and the TCO signal having the waveform shown in FIG. Detects the rise timing. Then, the encoding unit 711 performs second synchronization of the TCO signal by acquiring the next rising edge at 1 second intervals from the rising timing. Depending on the configuration of the receiving circuit 3, the voltage change may be reversed and the start timing may be indicated by a voltage fall.

  After performing the second synchronization processing, the encoding unit 711 detects the voltage level of the TCO signal at a predetermined interval with reference to the start timing of the TCO signal, and performs sampling processing. This predetermined interval is set by the sampling frequency. In the present embodiment, the encoding unit 711 samples the TCO signal at a sampling frequency of 32 Hz, and detects the voltage level at 1/32 second intervals from the rising edge of the TCO signal. Then, the encoding unit 711 encodes the TCO signal for each bit of the time code based on the voltage level, and generates a time code (bit string) corresponding to the TCO signal.

The start position determination unit 712 performs minute synchronization processing with reference to the time code generated by the encoding unit 711 to determine the start position of the frame. For example, when the Japanese standard radio wave “JJY” is received, the start position determination unit 712 detects a position where two bits encoded by the encoding unit 711 and the position marker “P” are arranged. The second bit “P” is used as the position of the marker “M” to determine the start position of the frame. When another standard radio wave is received, the start position of the frame is determined according to the standard radio wave format.
Further, when the start position of the frame is determined, the encoding unit 711 changes the determination condition for encoding the TCO signal, and further encodes the TCO signal. Then, the encoding unit 711 outputs the generated time code to the reception control unit 72.

[In the case of Japanese standard radio wave "JJY"]
Hereinafter, encoding of the TCO signal according to the Japanese standard radio wave “JJY” by the encoding unit 711 will be described.
When encoding the TCO signal corresponding to the standard radio wave “JJY”, the encoding unit 711 divides 1 second into 32 as shown in FIG. 2, and 1/32 second or more from the start timing of the TCO signal. A period of / 32 seconds or less is A period, a period of 8/32 seconds or more and 13/32 seconds or less is B period, a period of 18/32 seconds or more and 23/32 seconds or less is C period, and 27/32 seconds or more A period of 31/32 seconds or less is classified as a D period.
Then, the encoding unit 711 samples the TCO signal every 1/32 seconds in the period A to C before the determination of the start position of the frame, and based on the detected voltage level, for each bit of the time code The TCO signal is encoded into one of “0, 1, P”. On the other hand, after determining the start position of the frame, the encoding unit 711 samples the TCO signal every 1/32 seconds only in the period C, and based on the detected voltage level, the TCO signal is output for each bit of the time code. Is encoded with “0, 1”.

FIG. 3 is a diagram showing an encoding condition when the TCO signal is encoded to any one of “0, 1, P” before the start position is determined.
Specifically, in the example of the signal waveform illustrated in FIG. 2, before the start position is determined, the encoding unit 711 indicates that the voltage level of the input TCO signal is “A to C periods” as illustrated in FIG. 3. If it is “High”, the TCO signal is encoded with “0”, and the corresponding bit is set to “0”.
If the voltage level of the TCO signal is “High” in the A and B periods and “Low” in the C period, the encoding unit 711 encodes the TCO signal to “1” and sets the corresponding bit. “1”.
Further, if the voltage level of the TCO signal is “High” in the A period and “Low” in the B and C periods, the encoding unit 711 encodes the TCO signal to “P” and sets the corresponding bit. Let it be “P”.
In this way, the TCO signal is sampled for 1 minute to obtain a time code for one frame. Based on the time code of one frame, the start position determination unit 712 determines the start position of the frame. The time code is output to the reception control means 72.

FIG. 4 is a diagram illustrating an encoding condition when the TCO signal is encoded to “0, 1” after the start position is determined.
After the frame start position is determined, the encoding unit 711 sets the TCO signal to “0, 1” for each bit of the time code based on the voltage level of the TCO signal in the C period, as shown in FIG. It encodes to one of these.
Specifically, if the voltage level in the C period is “High”, the encoding unit 711 encodes the TCO signal to “0” and sets the corresponding bit to “0”.
If the voltage level is “Low”, the encoding unit 711 encodes the TCO signal to “1” and sets the corresponding bit to “1”.
The time code acquired in this way is output to the reception control means 72.

FIG. 5 is a diagram showing an appropriate TCO signal waveform and a TCO signal waveform (deformed waveform) affected by noise. The upper waveform of FIG. 5 shows the waveform of a standard TCO signal encoded as “1”, and the lower waveform shows the waveform of the TCO signal affected by noise.
Here, the receiving circuit 3 may not properly demodulate the received standard radio wave due to the influence of noise or the like. For example, as shown in the upper part of FIG. 5, the waveform of the TCO signal that is originally encoded as “1” is demodulated as a TCO signal with a short “High” period as shown in the lower part of FIG. May be. The waveform of the TCO signal is close to the waveform of the TCO signal encoded as “P” shown in FIG. Therefore, if the TCO signal is before the start position of the frame is determined, it is encoded to “P” instead of “1” based on the encoding condition shown in FIG. 3, and an appropriate time code is acquired. Can not.

  If such a time code is acquired, if an error determination is made for the time code, “P” is detected at an inappropriate position and recognized as an error. In this case, since the standard radio wave reception process and the encoding process are performed again, the time code acquisition process takes a long time. For this reason, when the number of times of performing each processing within a predetermined period (for example, 10 minutes) is set in advance due to power consumption or the like, the number of times is reached before obtaining an appropriate time code, There is a possibility that an appropriate time code cannot be obtained.

On the other hand, after the start position of the frame is determined, the encoding unit 711 changes to the encoding condition shown in FIG. 4 and changes the TCO signal to “0, 1 ". In this period C, the falling timing of the TCO signal encoded as “P” (voltage change timing that is not the start timing), the falling timing of the TCO signal encoded as “1”, and “0” are set. It is provided between the falling timing of the TCO signal to be encoded.
For this reason, since the TCO signal shown in the lower part of FIG. 5 is encoded to “1” instead of “P”, the TCO signal can be appropriately encoded and an appropriate time code can be obtained. Therefore, after determining the start position of the frame, an appropriate time code can be acquired without requiring a long time for the time code acquisition process.

[Encoding process]
FIG. 6 is a flowchart showing the encoding process by the reception processing means 71.
The reception processing unit 71 switches the encoding process for encoding the TCO signal according to the type of the standard radio wave received by the reception circuit 3. Hereinafter, an encoding process for encoding a TCO signal according to the Japanese standard radio wave “JJY” will be described.
The encoding process of the TCO signal is repeatedly executed at the start timing of the TCO signal synchronized in seconds (that is, at intervals of 1 second) while the TCO signal is input from the receiving circuit 3. And the said encoding process is performed over 1 minute, and, thereby, the time code of 1 frame is acquired.

Specifically, in this encoding process, as shown in FIG. 6, first, after the encoding unit 711 performs the second synchronization process, the TCO signal is sampled at a sampling frequency of 32 Hz while the TCO signal is sampled. It is determined whether 1 second has elapsed from the start timing of the signal (step S01).
If the encoding unit 711 determines that one second has not elapsed, the encoding unit 711 returns to step S01 and monitors the TCO signal until the one second has elapsed.

On the other hand, when determining that one second has elapsed, the encoding unit 711 determines whether or not the start position of the frame has been determined by the start position determination unit 712 (step S02).
If the encoding unit 711 determines that the start position has not been determined in the determination process of step S02, the encoding unit 711 detects the voltage level in the period A to C in the input TCO signal. Then, based on the encoding condition shown in FIG. 3, it is determined whether or not the TCO signal is a signal encoded to “P” (step S03).

If it is determined in step S03 that the signal is encoded to “P”, the encoding unit 711 encodes the TCO signal to “P” (step S04) and ends the encoding process. .
If it is determined in the determination process in step S03 that the signal is not encoded to “P”, the encoding unit 711 encodes the TCO signal to “1” based on the encoding condition shown in FIG. It is determined whether the signal is to be converted (step S05).
If it is determined in the determination process of step S05 that the signal is encoded to “1”, the encoding unit 711 encodes the TCO signal to “1” (step S06) and ends the encoding process. .
On the other hand, if it is determined in the determination process in step S05 that the signal is not encoded to “1”, the encoding unit 711 encodes the TCO signal to “0” (step S07) and ends the encoding process. To do.

  In the present embodiment, it is determined whether or not the input TCO signal is a signal encoded to “P” in the processes of steps S03 to S07, and then the TCO signal is set to “1”. It is determined whether or not the signal is to be encoded. However, the present invention is not limited to this, and the processing order is not limited as long as the TCO signal can be appropriately encoded into any one of “0, 1, P”.

When the above steps S01 to S07 are repeatedly executed and the time code of at least one frame is acquired, the start position determination unit 712 determines the start position of the frame.
When the encoding unit 711 determines that the start position of the frame is fixed in the determination process of step S02 described above, the encoding unit 711 determines that the encoding condition of the TCO signal illustrated in FIG. 4 is changed to the encoding condition shown in FIG. 4, and the determination period of the voltage level for encoding is changed from the A to C period to only the C period. That is, the encoding unit 711 detects the voltage level in the C period, and determines whether or not the voltage level is a high level (“0”) based on the encoding condition illustrated in FIG. It is determined whether or not the signal is to be encoded (step S08).

If it is determined in step S08 that the voltage level is high, the encoding unit 711 encodes the TCO signal to “0” (step S09) and ends the encoding process.
If it is determined in step S08 that the voltage level is not high (low), the encoding unit 711 encodes the TCO signal to “1” (step S10). The process is terminated.
Then, the reception processing unit 71 repeatedly executes the encoding process and, when acquiring a time code for one frame, outputs the time code to the reception control unit 72.

  In the present embodiment, the processes in steps S08 to S10 are performed on the TCO signal input after the start position of the frame is determined. However, the present invention is not limited to this, and after the start position of the frame is determined, the bit for which the marker “M” and the position markers “P0” to “P5” are set based on the format of the received standard radio wave, and fixed. Steps S08 to S10 may be executed for a TCO signal corresponding to a bit other than a bit for which “0” is set (a bit for which “0” or “1” is set). . In this case, the same time code can be acquired before and after the determination of the start position of the frame. For this reason, it is not necessary to change the processing content of the reception control means 72 for the acquired time code before and after the start position is determined, and error determination can be performed appropriately.

[In the case of the United States standard radio wave "WWVB"]
Next, encoding of the TCO signal according to the standard radio wave “WWVB” of the United States will be described.
FIG. 7 is a diagram illustrating signal waveforms of “P”, “1”, and “0” in the standard radio wave “WWVB”. FIG. 8 and FIG. 9 are diagrams showing encoding conditions when encoding the TCO signal before and after the start position of the frame is determined.
The reception processing unit 71 encodes the TCO signal corresponding to the standard radio wave “WWVB” by the same processing as the encoding process of the TCO signal corresponding to the standard radio wave “JJY”.
In this encoding process, before the frame start position is determined, the encoding unit 711 performs the A to C periods of the same A to D periods as the standard radio wave “JJY” as shown in FIGS. 7 and 8. Based on the voltage level of the TCO signal at, the TCO signal is encoded into one of “0, 1, P” for each bit of the time code. In addition, after the start position is determined, the encoding unit 711 converts the TCO signal into “TCO signal” for each bit of the time code based on the voltage level of the TCO signal in the period B, as shown in FIGS. 7 and 9. It encodes to either “0, 1”.

Specifically, in the example of the TCO signal having the waveform shown in FIG. 7, the encoding unit 711 detects the falling timing of the TCO signal as the start timing, and executes the second synchronization processing. Depending on the configuration of the receiving circuit 3, the voltage change may be reversed, and the start timing may be indicated by the rise of the voltage.
If the voltage level of the TCO signal is “Low” in the period A to C based on the encoding conditions shown in FIG. 8 before the start position of the frame is determined, the encoding unit 711 sets the TCO signal to “ P ”is encoded, and the corresponding bit is set to“ P ”.
If the voltage level of the TCO signal is “Low” in the A and B periods and “High” in the C period, the encoding unit 711 encodes the TCO signal to “1” and sets the corresponding bits. “1”.
Similarly, if the voltage level of the TCO signal is “Low” in the A period and “High” in the B and C periods, the encoding unit 711 encodes the TCO signal to “0” and applies the corresponding bit. Is “0”.
Then, the start position determination unit 712 determines the start position of the frame based on the encoded bit string (time code).

After the start position of the frame is determined, the encoding unit 711 determines that the TCO signal is “1” if the voltage level of the TCO signal is “Low” in the B period based on the encoding condition shown in FIG. And the corresponding bit is set to “1”.
Similarly, if the voltage level of the TCO signal is “High” in the B period, the encoding unit 711 encodes the TCO signal to “0” and sets the corresponding bit to “0”.
As described above, after the frame start position is determined, the encoding unit 711 shortens the sampling period and the number of times of the TCO signal, so that the encoding process by the reception processing unit 71 is simplified.

  Here, as shown in FIG. 7, in the case of the standard radio wave “WWVB”, the voltage change timing (rise timing) that is not the start timing of the TCO signal encoded as “1” is the next start timing due to the influence of noise. When approaching the (next falling timing) side, the waveform of the TCO signal encoded to “P” (having a voltage rise between 25/32 seconds after the start timing and 26/32 seconds later) Waveform). In particular, when the voltage change timing is closer to the next start timing than the C period, the TCO signal is encoded to “P” under the encoding conditions before the start position determination shown in FIG.

  On the other hand, in this embodiment, B between the voltage change timing that is not the start timing of the TCO signal encoded to “0” and the voltage change timing that is not the start timing of the TCO signal encoded to “1”. In the period, a period in which the encoding unit 711 determines the voltage level is set. According to this, as in the case of the above-mentioned Japanese standard radio wave “JJY”, the voltage change timing of the TCO signal encoded as “1” is shifted to the next start timing side due to the influence of noise or the like. Even in this case, the TCO signal can be reliably encoded to “1” instead of “P”. Therefore, the occurrence of an error can be prevented more reliably, and time data can be acquired more appropriately without increasing the reception time.

[In case of German standard radio wave "DCF77"]
Next, encoding of the TCO signal according to the German standard radio wave “DCF77” will be described.
FIG. 10 is a diagram illustrating signal waveforms of “M”, “0”, and “1” in the standard radio wave “DCF77”. FIG. 11 and FIG. 12 are diagrams showing encoding conditions when encoding the TCO signal before and after the determination of the start position of the frame.
The reception processing unit 71 encodes the TCO signal corresponding to the standard radio wave “DCF77” by the same process as the encoding process of the TCO signal corresponding to the standard radio wave “JJY”.
In this encoding process, the encoding unit 711 sets a period from 1/32 second to 2/32 second from the start timing (rise timing) of the TCO signal as A period, as shown in FIG. A period from 2 seconds to 5/32 seconds is defined as a B period, and a period from 28/32 seconds to 31/32 seconds is defined as a D period, and a TCO signal is encoded based on the voltage level of these periods.

Specifically, in the example of the TCO signal having the waveform illustrated in FIG. 10, the encoding unit 711 detects the falling timing of the TCO signal as the start timing and performs the second synchronization processing. Depending on the configuration of the receiving circuit 3, the voltage change may be reversed, and the start timing may be indicated by the rise of the voltage.
Then, the encoding unit 711 determines the voltage level in the A, B, and D periods based on the encoding conditions shown in FIG. 11 before determining the start position of the frame, and for each bit of the time code. , The TCO signal is encoded to one of “0, 1, M”.

That is, as shown in FIG. 11, when the voltage level of the TCO signal is “High” in the A, B, and D periods, the encoding unit 711 encodes the TCO signal to “M” and sets the corresponding bits to “ M ”.
If the voltage level of the TCO signal is “Low” in the A period and “High” in the B and D periods, the encoding unit 711 encodes the TCO signal to “0” and sets the corresponding bit. “0”.
Similarly, if the voltage level of the TCO signal is “Low” in the A and B periods and “High” in the D period, the encoding unit 711 encodes the TCO signal to “1” and applies the corresponding bit. Is “1”.
Thereafter, the start position determination unit 712 determines the start position of the frame based on the encoded bit string (time code).

After determining the start position of the frame, the encoding unit 711 encodes each bit of the TCO signal to “0, 1” based on the voltage level in the B period.
That is, as shown in FIG. 12, when the voltage level of the input TCO signal is “High” in the B period, the encoding unit 711 encodes the TCO signal to “0” and sets the corresponding bit to “ 0 ”.
On the other hand, if the voltage level of the TCO signal is “Low” in the B period, the TCO signal is encoded to “1” and the corresponding bit is set to “1”.
As described above, even when the standard radio wave “DCF77” is received, the encoding processing by the reception processing unit 71 is simplified after the start position of the frame is determined.

  Here, as shown in FIG. 10, in the case of the standard radio wave “DCF77”, the voltage change timing (rise timing) that is not the start timing of the TCO signal encoded to “0” corresponds to the bit corresponding to the influence of noise. Is closer to the waveform of the TCO signal encoded as “M” (a waveform whose voltage level is “High” in one second from the start timing). In particular, when the voltage change timing is closer to the start timing than the period A, the TCO signal is encoded to “M” under the encoding conditions before the start position determination shown in FIG.

  On the other hand, in this embodiment, B between the voltage change timing that is not the start timing of the TCO signal encoded to “0” and the voltage change timing that is not the start timing of the TCO signal encoded to “1”. In the period, a period in which the encoding unit 711 determines the voltage level is set. According to this, as in the case of the standard radio waves “JJY” and “WWVB” described above, the voltage change timing of the TCO signal encoded as “0” is shifted to the start timing side due to the influence of noise or the like. Even in this case, the TCO signal can be reliably encoded to “0” instead of “M”. Therefore, the occurrence of an error can be prevented more reliably, and time data can be acquired more appropriately without increasing the reception time.

[In case of UK standard radio wave "MSF"]
Next, encoding of a TCO signal according to the British standard radio wave “MSF” will be described.
FIG. 13 is a diagram illustrating signal waveforms of “M”, “00”, “01”, “10”, and “11” in the standard radio wave “MSF”. FIG. 14 and FIG. 15 are diagrams showing encoding conditions when encoding the TCO signal before and after the frame start position is determined.
The reception processing unit 71 encodes the TCO signal corresponding to the standard radio wave “MSF” by the same processing as the encoding process of the TCO signal corresponding to the standard radio wave “JJY”.
In this encoding process, as shown in FIG. 13, the encoding unit 711 sets a period from 1/32 seconds to 2/32 seconds from the rising timing of the TCO signal as an A period, and from 4/32 seconds to 5 / A period of 32 seconds or less is a B period, a period of 8/32 seconds or more and 9/32 seconds or less is a C period, a period of 13/32 seconds or more and 15/32 seconds or less is a D period, and 19/32 seconds or more 21 A period of / 32 seconds or less is classified as an E period.

In the example of the TCO signal having the waveform shown in FIG. 13, the encoding unit 711 detects the falling timing of the TCO signal as the start timing, and executes the second synchronization process. Depending on the configuration of the receiving circuit 3, the voltage change may be reversed, and the start timing may be indicated by the rise of the voltage.
Then, the encoding unit 711 determines the voltage level in the period A to E based on the encoding condition shown in FIG. 14 before the determination of the start position of the frame, and converts the TCO signal to “M” for each bit of the time code. , 00, 01 (10), 11 ".

Specifically, the encoding unit 711 encodes the TCO signal to “M” if the voltage level of the TCO signal is “Low” in the periods A to D and “High” in the period E, and the corresponding level is satisfied. Let the bit be “M”.
If the voltage level of the TCO signal is “Low” in the A period and “High” in the B to E periods, the encoding unit 711 encodes the TCO signal to “00” and sets the corresponding bits. “00”.
Further, if the voltage level of the TCO signal is “Low” in the A and B periods and “High” in the C to E periods, the encoding unit 711 encodes the TCO signal to “01” or “10”. And the corresponding bit is set to “01” or “10”.
Similarly, if the voltage level of the TCO signal is “Low” in the periods A to C and “High” in the periods D and E, the encoding unit 711 encodes the TCO signal to “11” and applies The bit to be set is “11”.
Then, the start position determination unit 712 determines the start position of the frame based on the encoded bit string (time code).

On the other hand, after determining the start position of the frame, the encoding unit 711 determines the voltage level in the period A to C based on the encoding condition shown in FIG. 15, and sets the TCO signal to “00” for each bit of the time code. , 01 (10), 11 ".
Specifically, if the voltage level of the TCO signal is “Low” in the A period and “High” in the B and C periods, the encoding unit 711 encodes the TCO signal to “00” and applies. The bit is set to “00”.
Also, the encoding unit 711 encodes the TCO signal to “01” or “10” if the voltage level of the TCO signal is “Low” in the A and B periods and “High” in the C period, The corresponding bit is set to “01” or “10”.
Similarly, if the voltage level of the TCO signal is “Low” in the period A to C, the encoding unit 711 encodes the TCO signal to “11” and sets the corresponding bit to “11”.
As described above, even when the standard radio wave “MSF” is received, after the start position of the frame is determined, the encoding process by the reception processing unit 71 is simplified.

  Here, as shown in FIG. 13, in the case of the standard radio wave “MSF”, the voltage change timing (rise timing) that is not the start timing of the TCO signal encoded to “11” due to the influence of noise or the like starts the next start. When approaching the timing (next falling timing) side, the waveform of the TCO signal encoded to “M” (a waveform having a voltage rising 16/32 seconds after the start timing) is approached. In particular, when the voltage change timing is closer to the next start timing than the D period, the TCO signal is encoded to “M” under the encoding conditions before the start position determination shown in FIG.

On the other hand, in this embodiment, the voltage level is determined by the encoding means in the period A to C which is less than 16/32 seconds from the start timing (falling timing) and is closer to the start timing than the D period. A period is provided.
According to this, similarly to the standard radio waves “JJY”, “WWVB”, and “DCF77” described above, a voltage change timing (rise timing) that is not the start timing of the TCO signal encoded as “11” due to the influence of noise or the like. ) Can be reliably encoded to “11” instead of “M” even when the next start timing is approached. Therefore, the occurrence of an error can be prevented more reliably, and time data can be acquired more appropriately without increasing the reception time.

[Effect of the embodiment]
The radio-controlled timepiece 1 according to the present embodiment described above has the following effects.
The encoding unit 711 changes the encoding condition of the TCO signal before and after the frame start position is determined by the start position determination unit 712.
When the antenna 2 and the receiving circuit 3 receive a standard radio wave of Japan, the United States of America, or Germany, the encoding unit 711 encodes the marker “M” and the position marker “P” after the start position is determined. Is omitted, and the TCO signal is encoded into either “0” or “1”.

When the antenna 2 and the receiving circuit 3 receive a British standard radio wave, after the start position is determined, the encoding unit 711 omits encoding to the marker “M” and sets the TCO signal to “00”. And “01” or “10” and “11”.
According to this, since the conditions referred to when encoding the TCO signal after the start position is determined are reduced, the encoding process by the encoding unit 711 can be simplified. Furthermore, since the encoding process can be simplified, the power consumption required for the encoding process can be reduced, and consequently the power consumption of the radio-controlled timepiece 1 can be reduced.

When the Japanese standard radio wave “JJY” is received, the TCO signal encoded as “1” is not properly demodulated due to the influence of noise or the like, the inversion position of the voltage level changes, and the position marker “P” The TCO signal may be close to the waveform encoded with “ If this TCO signal is encoded as “P”, it is recognized as an error, and it is necessary to receive the standard radio wave again, and the reception time (time code acquisition time) becomes longer.
On the other hand, after the frame start position is determined, encoding to “P” is omitted, and the TCO signal is encoded to either “0” or “1”. According to this, it is possible to prevent the TCO signal to be encoded as “1” from being encoded as “P”. Therefore, since the occurrence of an error can be prevented, time data can be appropriately acquired without increasing the reception time.
As described above, the same applies to other standard radio waves.

When the radio-controlled timepiece 1 receives a standard radio wave of Japan, the United States of America, or Germany, the encoding unit 711 determines the voltage change of the TCO signal encoded as “0” after the start position of the frame is determined, and “ The TCO signal is encoded into two types of “0” and “1” based on a voltage level in a period in which a difference occurs between the voltage change of the TCO signal encoded as “1”.
Specifically, when receiving the Japanese standard radio wave “JJY”, after the frame start position is determined, the encoding unit 711 encodes the TCO signal based on the voltage level in the above-described C period. When receiving the standard radio wave “WWVB” of the United States of America, after the start position is determined, the encoding unit 711 encodes the TCO signal based on the voltage level of the B period described above. Further, in the case of receiving the German standard radio wave “DCF77”, after the start position is determined, the encoding unit 711 encodes the TCO signal based on the voltage level in the B period described above.

According to this, since the difference in voltage level in the TCO signal encoded as “0” and “1” can be reliably detected, the TCO signal can be appropriately encoded.
In addition, since there is a time margin between the voltage change timing of the TCO signal and the period in which the voltage level is determined by the encoding unit 711, even if the voltage change timing is shifted due to the influence of noise or the like, The TCO signal can be appropriately encoded to “0” or “1”. Therefore, the TCO signal can be encoded reliably and appropriately.

Similarly, when the radio-controlled timepiece 1 receives a British standard radio wave, the encoding unit 711 determines the voltage change of the TCO signal encoded as “00” and “01” after the start position of the frame is determined. Alternatively, the TCO signal is classified into three types based on the voltage level in a period in which a difference occurs between the voltage change of the TCO signal encoded as “10” and the voltage change of the TCO signal encoded as “11”. Is encoded.
Specifically, when the British standard radio wave “MSF” is received, after the start position is determined, the TCO signal is encoded based on the voltage level in the period A to C described above.

According to this, since the difference in voltage level in the TCO signal encoded as “00”, “01” or “10”, and “11” can be reliably detected, the TCO signal is appropriately encoded. it can.
In addition, since there is a time margin between the voltage change timing of the TCO signal and the period in which the voltage level is determined by the encoding unit 711, even if the voltage change timing is shifted due to the influence of noise or the like, The TCO signal can be appropriately encoded into “00”, “01” or “10”, and “11”. Therefore, the TCO signal can be encoded reliably and appropriately.

  When the radio-controlled timepiece 1 receives the standard radio wave “JJY”, after the start position of the frame is determined, from the voltage change timing (falling timing) that is not the start timing of the TCO signal encoded as “0”, A period in which the encoding unit 711 determines the voltage level is provided in the C period until the voltage change timing which is not the start timing of the TCO signal encoded as “1”. According to this, the waveform of the TCO signal encoded as “1” with the voltage change timing approaching the start timing side becomes close to the waveform of the TCO signal encoded as “P” due to the influence of noise or the like. Even in this case, the TCO signal can be reliably encoded to “1” instead of “P”. Therefore, the occurrence of an error can be prevented more reliably, and time data can be acquired more appropriately without increasing the reception time.

  Further, when the radio-controlled timepiece 1 receives the standard radio wave “WWVB”, after the start position of the frame is determined, the voltage change timing (rise timing) that is not the start timing of the TCO signal encoded as “0”. , A period in which the encoding unit 711 determines the voltage level is provided in a period B until the voltage change timing which is not the start timing of the TCO signal encoded as “1”. According to this, the waveform of the TCO signal encoded as “1” with the voltage change timing approaching the next start timing becomes the waveform of the TCO signal encoded as “P” due to the influence of noise or the like. Even when the values become close, the TCO signal can be reliably encoded to “1” instead of “P”. Therefore, the occurrence of an error can be prevented more reliably, and time data can be acquired more appropriately without increasing the reception time.

  Further, when the radio-controlled timepiece 1 receives the standard radio wave “DCF77”, after the start position of the frame is determined, the voltage change timing (rise timing) that is not the start timing of the TCO signal encoded as “0” is used. , A period in which the encoding unit 711 determines the voltage level is provided in a period B until the voltage change timing which is not the start timing of the TCO signal encoded as “1”. According to this, the waveform of the TCO signal encoded as “0” with the voltage change timing approaching the start timing side becomes close to the waveform of the TCO signal encoded as “M” due to the influence of noise or the like. Even in this case, the TCO signal can be reliably encoded to “0” instead of “M”. Therefore, the occurrence of an error can be prevented more reliably, and time data can be acquired more appropriately without increasing the reception time.

  Similarly, when the radio-controlled timepiece 1 receives the standard radio wave “MSF”, after the start position of the frame is determined, a period during which the encoding unit 711 determines the voltage level is provided in the period A to C described above. It has been. According to this, the waveform of the TCO signal that is encoded to “11” with the voltage change timing that is not the start timing approaching the next start timing is changed to the waveform of the TCO signal that is encoded to “M” due to the influence of noise or the like. Even when the waveform approaches, the TCO signal can be reliably encoded to “11” instead of “M”. Therefore, the occurrence of an error can be prevented more reliably, and time data can be acquired more appropriately without increasing the reception time.

[Modification of Embodiment]
The present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In the above embodiment, in the Japanese standard radio wave “JJY”, the TCO signal in which the voltage rises at the start timing of the bit and the voltage falls after a predetermined time within 1 second has been exemplified, but the present invention is not limited to this. For example, the TCO signal whose voltage level is inverted from that of the above embodiment may be input to the control circuit 7 depending on the configuration of the receiving circuit. In this case, the reception processing means may handle the rising timing and the falling timing in reverse. The same applies to the American standard radio wave “WWVB”, the German standard radio wave “DCF77” and the British standard radio wave “MSF”, and the same applies to other standard radio waves (for example, the standard radio wave “BPC” of the People's Republic of China). is there.

In the above embodiment, the encoding unit 711 samples the TCO signal at a sampling frequency of 32 Hz, but the present invention is not limited to this. That is, if the TCO signal can be appropriately encoded, the sampling frequency can be set as appropriate.
For example, when a demodulated signal of a Japanese standard radio wave (TCO signal) is encoded with a sampling frequency of 64 Hz, after the start position of the frame is determined, it is 36/64 seconds or more from the start timing of the demodulated signal. Based on the voltage level for a period of 64 seconds or less, the demodulated signal is encoded into two types of “0” and “1”.
When a demodulated signal of a standard radio wave of the United States is encoded at the same frequency, after the start position of the frame is determined, the voltage level is from 16/64 seconds to 26/64 seconds from the start timing of the demodulated signal. Based on the above, the demodulated signal is encoded into two types of “0” and “1”.

When a German standard radio wave demodulated signal is encoded at the same frequency, after the start position of the frame is determined, the voltage level is from 8/64 seconds to 10/64 seconds from the start timing of the demodulated signal. Based on the above, the demodulated signal is encoded into two types of “0” and “1”.
Similarly, when the demodulated signal of the British standard radio wave is encoded at the same frequency, after the start position of the frame is determined, a period from 2/64 seconds to 4/64 seconds from the start timing of the demodulated signal. , The demodulated signal is set to “00”, “01” or “01” based on the voltage levels of 8/64 seconds to 10/64 seconds and 16/64 seconds to 18/64 seconds, respectively. Encoding is performed into three types, “10” and “11”.

  Further, when the TCO signal corresponding to each standard radio wave is encoded, the period during which the voltage level is determined by the encoding unit 711 is based on the sampling frequency if the TCO signal can be appropriately encoded. Can be set as appropriate. For example, when receiving the Japanese standard radio wave “JJY”, after the start position of the frame is determined, the voltage level in the period from 16/32 seconds to 25/32 seconds from the rising timing of the TCO signal voltage is determined. Thus, the TCO signal may be encoded to “0” or “1”. The same applies to other standard radio waves.

  In the above embodiment, the encoding unit 711 continues sampling of the TCO signal during the period of determining the voltage level when encoding the TCO signal, but the present invention is not limited to this. For example, the voltage level of the TCO signal may be determined at least once during the period. Furthermore, the average voltage level in the period may be calculated, and the TCO signal may be encoded based on the average voltage level.

  In the above embodiment, the encoding unit 711 determines in step S01 whether one second has elapsed from the start timing of the second-synchronized TCO signal, but the present invention is not limited to this. That is, after the determination period for encoding the TCO signal has elapsed, the process may proceed to step S02. For example, when encoding a TCO signal corresponding to the Japanese standard radio wave “JJY”, the voltage level in the period A to C is detected, and the process proceeds to step S02 after the period C has elapsed. May be. The same applies to the case where a TCO signal corresponding to another standard radio wave is encoded.

  In the embodiment, when receiving the Japanese standard radio wave “JJY”, the encoding unit 711 sets the input TCO signal to “0” or “0” for each bit of the time code after the start position of the frame is determined. The encoding is “1”, but the present invention is not limited to this. In other words, in the time format of the standard radio wave, the frame start position is determined for the location where the marker “M” and the position markers “P0” to “P5” are set and where “0” is fixed. The TCO signal is encoded based on the previous condition (the condition shown in FIG. 3), and for the part encoded as “0” or “1”, the condition after the start position is determined (see FIG. 4). The TCO signal may be encoded based on the conditions shown). The same applies to other standard radio waves.

In the above embodiment, the antenna 2, the receiving circuit 3, and the control circuit 4 (particularly the reception processing means 71) constituting the time receiving device of the present invention are exemplified in the radio-controlled timepiece 1. However, the present invention Not limited to this. For example, the present invention may be applied to a recording device that performs timer recording or a watch built in a mobile phone or the like.
In the embodiment, the antenna 2 and the receiving circuit 3 can receive the standard radio waves “JJY”, “MSF”, “DCF77”, “WWVB”, and “BPC” of Japan, the UK, Germany, the US, and the People's Republic of China. Although configured, the present invention is not limited to this. That is, it is only necessary to be configured to receive at least one of these standard radio waves. Furthermore, other standard radio waves may be configured to be received, or other standard radio waves may be configured to be received instead of these standard radio waves.

  DESCRIPTION OF SYMBOLS 1 ... Radio wave correction clock, 2 ... Antenna (reception means, time reception device), 3 ... Reception circuit (reception means, time reception device), 4 ... Control device (time reception device), 11 ... Hour hand (display means), 12 ... minute hand (display means), 13 ... second hand (display means), 72 ... reception control means (time correction means), 75 ... display control means (display means), 711 ... encoding unit (encoding means), 712 ... start Position determination unit (start position determination means).

Claims (9)

Receiving means for receiving a standard radio wave including time data composed of frames;
Encoding means for encoding the demodulated signal of the standard radio wave received by the receiving means for each bit of the time data, and obtaining the time data;
Start position determining means for determining the start position of the frame based on the time data encoded by the encoding means,
The encoding means includes
Before and after the determination of the start position by the start position determination means, change the encoding condition of the demodulated signal ,
Before the start position is determined, the demodulated signal is set to “0”, “1”, based on the voltage levels of a plurality of periods set in the demodulated signal input period corresponding to one bit of the time data. Encode it into 3 types of "P" and "M"
After the start position is fixed, the demodulated signal is encoded into two types of “0” and “1” based on the voltage level of one of the plurality of periods. Receiver device. The time receiver according to claim 1,
The receiving means is configured to receive Japanese standard radio waves,
When the encoding means encodes a demodulated signal of a Japanese standard radio wave, after the start position is determined, a period of 18/32 seconds or more and 23/32 seconds or less from the start timing of the input period. A time receiving apparatus that encodes the demodulated signal into two types of “0” and “1” based on the voltage level of the demodulated signal. In the time receiver according to claim 1 or 2,
The receiving means is configured to receive a standard radio wave of the United States,
When the encoding means encodes a demodulated signal of a standard radio wave of the United States of America, after the start position is determined, a period from 8/32 seconds to 13/32 seconds from the start timing of the input period. A time receiving apparatus that encodes the demodulated signal into two types of “0” and “1” based on the voltage level of the demodulated signal. In the time receiver according to any one of claims 1 to 3,
The receiving means is configured to receive German standard radio waves,
When the encoding means encodes a demodulated signal of a German standard radio wave, after the start position is determined, a period of 4/32 seconds to 5/32 seconds from the start timing of the input period. A time receiving apparatus that encodes the demodulated signal into two types of “0” and “1” based on the voltage level of the demodulated signal. In the time receiver according to any one of claims 1 to 4,
The receiving means is configured to be able to receive British standard radio waves,
The encoding means encodes a demodulated signal of a British standard radio wave,
Before the start position is determined, the demodulated signal is set to “00” and “00” based on the voltage level of four or more periods set in the demodulated signal input period corresponding to one bit of the time data. 01 ”,“ 10 ”,“ 11 ”, and“ M ”are encoded into five types,
After the start position is determined, the demodulated signal is set to “00”, “01” or “10”, and “11” based on the voltage levels of three of the four or more periods. A time receiving device characterized by encoding into the following three types. Receiving means for receiving a standard radio wave including time data composed of frames;
  Encoding means for encoding the demodulated signal of the standard radio wave received by the receiving means for each bit of the time data, and obtaining the time data;
  Start position determining means for determining the start position of the frame based on the time data encoded by the encoding means,
  The receiving means is configured to be able to receive British standard radio waves,
  The encoding means includes
  Before and after the determination of the start position by the start position determination means, change the encoding condition of the demodulated signal,
  When encoding the demodulated signal of the British standard radio wave,
  Before the start position is determined, the demodulated signal is set to “00” and “00” based on the voltage level of four or more periods set in the demodulated signal input period corresponding to one bit of the time data. 01 ”,“ 10 ”,“ 11 ”, and“ M ”are encoded into five types,
  After the start position is determined, the demodulated signal is set to “00”, “01” or “10”, and “11” based on the voltage levels of three of the four or more periods. Encode into three types
  A time receiver characterized by that. In the time receiver of Claim 5 or Claim 6 ,
When the encoding means encodes a demodulated signal of a British standard radio wave, after the start position is determined, a period of 1/32 seconds to 2/32 seconds from the start timing of the input period. Based on the voltage level of the demodulated signal in the period from 4/32 seconds to 5/32 seconds and the period from 8/32 seconds to 9/32 seconds, the demodulated signal is set to “00”. A time receiving apparatus that encodes into three types of "01" or "10" and "11". A time receiving device according to any one of claims 1 to 7,
Based on the time data acquired by the time receiving device, time correction means for correcting the internal time,
And a display means for displaying the corrected internal time. Encodes the demodulated signal of the standard radio wave, a coding method for acquiring time data composed of frames is Ru included in the standard radio,
Encoding the demodulated signal for each bit of the time data to obtain the time data;
A start position determining step for determining a start position of the frame based on the acquired time data;
Wherein at the start prior to confirmation position and the finalization, have a, a condition change step of changing a coding condition of the demodulated signal,
The encoding step includes
Before the start position is determined, the demodulated signal is set to “0”, “1”, based on the voltage levels of a plurality of periods set in the demodulated signal input period corresponding to one bit of the time data. Encode it into 3 types of "P" and "M"
After the start position is determined, the demodulated signal is encoded into two types of “0” and “1” based on the voltage level of one of the plurality of periods. Method.

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