JP2008051528A - Time correction apparatus, time measuring apparatus with the same, and time correction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a time correction apparatus etc. capable of preventing electric power consumption from increasing even when ultra-low power is required and highly accurately correcting time. <P>SOLUTION: The time correction apparatus 10 has a reception part 24 for receiving signals from a base station 15a; a power supply part 27; and a display time information correction part 37 for correcting display time information 12 and 25. Signals received at the reception part includes time information. The time information is future time information after a lapse of a prescribed time since reception time information, which is a time received by the reception part. The time correction apparatus 10 has a difference time information storage part for storing time information 41a on the difference between the future time information and the reception time information; a reception time information generating part 35 for generating reception time information of the reception part on the basis of the future time information received by the reception part and the difference time information; and a correction time information generating part 37 for generating correction time information for correction of the display time information correction part on the basis of the reception time information and processing time information 43a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a time adjustment device and a time adjustment device that perform time adjustment based on time information included in a signal transmitted from a base station in a CDMA (Code Division Multiple Access) mobile phone communication network, for example. The present invention relates to a timekeeping device and a time correction method.

Currently, a signal transmitted from a base station to a mobile phone in a CDMA mobile phone communication network includes time information. This time information is a GPS time based on an atomic clock of a GPS (Global Positioning System) satellite. It is time information with extremely high accuracy that matches.
Therefore, a proposal has been made in which a terminal acquires GPS time data transmitted from a base station in the CDMA mobile phone communication network, and corrects the time data of the built-in clock using the GPS time data (for example, Patent Document 1).
JP 2000-321383 A (summary etc.)

However, the time data transmitted from the base station in the CDMA mobile phone communication network is not time data at the time of transmission but time data after a certain amount of time has elapsed since the time of transmission.
This is because the cellular phone that has received the time data performs time synchronization after processing the data. That is, the mobile phone that has acquired the time data from the base station prepares to synchronize with the signal from the base station therein, and after the preparation is completed, based on the time data, the signal of the base station And time synchronization.
In other words, if the time data transmitted from the base station is used as the time of reception, there is a problem that synchronization cannot be achieved in time for internal processing and time synchronization, and communication cannot be performed as a result.
For this reason, the time data transmitted from the base station in the CDMA mobile phone communication network is time data after a lapse of a predetermined time, and the mobile phone is configured to receive such a future time.

When such a future time is received and an attempt is made to correct the time, since the time itself is not the time at the time of reception, the time must be adjusted until the future time is reached. This means that the side continues to communicate with the base station until the future time, and power consumption increases.
In addition, there is a problem that a receiver with such high power consumption cannot be mounted on a device such as a watch that requires ultra-low power. There was also a problem that it was not possible.

  Thus, the present invention provides a time adjustment device, a time adjustment device with a time adjustment device, and a time adjustment method capable of correcting the time with high accuracy without increasing power consumption even when ultra-low power is required. For the purpose.

  According to the present invention, the subject is a receiving unit that receives a signal from a base station, a power supply unit that supplies power for communication by the receiving unit, and correction of display time information on a time information display unit. A display time information correction unit, wherein the signal received by the reception unit includes time information, and the time information is obtained from reception time information that is a time received by the reception unit. It is future time information after a predetermined time has elapsed, a difference time information storage unit that stores difference time information between the future time information and the reception time information, and at least the future time information received by the reception unit The reception time information generation unit that generates reception time information of the reception unit based on the difference time information, the reception time information generated by the reception time information generation unit, and at least processing time information of the time correction device Hazuki is achieved by the time adjustment device also has a a modification time information generating unit that generates the correction time information for modifying said display time information adjustment unit.

According to the said structure, the time information which the receiving part of a time correction apparatus receives becomes the future time information after predetermined time progress from the receiving time information which is the time which a receiving part receives. Further, the time adjustment device has difference time information between the reception time information and future time information.
Further, the time adjustment device has a reception time information generation unit that generates reception time information based on the future time information and the difference time information. For this reason, the reception time information generating unit can accurately acquire the reception time information received by the time adjustment device.
Therefore, in the above configuration, accurate time information can be acquired even if the receiving unit does not continue to receive a signal until the future time is reached for the future time received from the base station as in the past. For this reason, the receiving unit of the time adjustment device does not need to continue receiving the signal after acquiring the future time information, and the receiving unit can be in a state of not receiving the signal.
From the above, it is possible to significantly reduce the time for receiving a signal and to significantly reduce the power consumption as compared with the conventional case. That is, in the said structure, it becomes a time adjustment apparatus which can respond also to the apparatus etc. for which ultra low power is calculated | required.

By the way, when the display time information correction unit of the time adjustment device corrects the time information display unit with the reception time information described above, the time is different by the time when the device is operated to calculate the reception time information. Become.
The time correction apparatus has a configuration in which the correction time information generation unit generates the correction time information based on at least the reception time information and the processing time information described above.
That is, the time adjustment device having the above-described configuration has processing time information that is the time during which the reception time information generation unit operates within the device, and finally, based on this processing time information, the time information display unit is provided. By correcting the time, it is possible to correct the time with extremely high accuracy.

  Preferably, the time information received by the receiving unit includes at least GPS time information of a GPS satellite, base station error time information of a signal transmitted from the base station, and the GPS time information at a Coordinated Universal Time (UTC). UTC conversion information to be converted and local time conversion information to be converted to local time, and the reception time information generation unit includes at least the GPS time information, the UTC conversion information, the local time conversion information, and the base station error time. The time correction device is configured to generate the reception time information based on information and the difference information.

According to the above configuration, the time information has GPS time information. This is data of an atomic clock in a GPS satellite orbiting the earth, and is extremely accurate time information. Further, the time information includes base station error time information. This base station error time information is information for transmitting a signal at a different time in order to identify which base station the signal receiving side has received, for example, 64 chips (0.052 ms). Sending data in different units. The receiving side can identify the base station by grasping this time error.
Therefore, the time adjustment device is configured to be able to acquire more accurate actual reception time information and the like with no error using GPS time information and base station error time information.

The time information includes UTC conversion information for converting GPS time information at the time of the global agreement and regional time conversion information for converting to local time. The reception time information generation unit includes at least GPS time information, UTC conversion information, region The reception time information is generated based on time conversion information, base station error time information, and difference information.
For this reason, the GPS time can be corrected at the time of the global agreement, and further can be adjusted to the local time (for example, Japan time). Therefore, the time difference in the country or region where the time information display unit to be corrected is considered It is possible to accurately acquire the time of the country and region.

  Preferably, the time information includes seasonal time information to be converted into a seasonal time.

  According to the above configuration, since the time information includes the seasonal time information converted into the seasonal time, even when the seasonal time such as summer time is changed depending on the region, the time corresponding to the changed seasonal time is accurately set. Can be acquired.

  Preferably, the local time conversion information and the seasonal time information of the time information are configured to be input via an external input unit operable by a user.

  According to the above configuration, the local time conversion information and the seasonal time information of the time information are configured to be input via the external input unit that can be operated by the user. It can be time.

  Preferably, the time adjustment device is characterized in that processing time information of the time adjustment device is stored as a fixed value.

  According to the said structure, since the processing time information of the time correction apparatus is stored as a fixed value, time correction can be carried out quickly, without acquiring treatment time information from the outside.

  Preferably, in the time adjustment device, the signal transmitted from the base station is a signal transmitted from the base station in a CDMA (Code Division Multiple Access) mobile phone communication network. is there.

  According to the above configuration, since the signal transmitted from the base station is a signal transmitted from the base station in the CDMA (Code Division Multiple Access) system mobile phone communication network, the CDMA system mobile phone By using the communication network, it is possible to correct the time with high accuracy.

According to the present invention, the subject is a receiving unit that receives a signal from a base station, a power supply unit that supplies power for the receiving unit to perform communication, and a time information display unit that displays display time information. ,
A time measuring device with a time adjustment device having a display time information correction unit for correcting the display time information of the time information display unit, wherein the signal received by the reception unit includes time information, and this time The information is future time information after a predetermined time from the reception time information that is the time received by the receiving unit, and the difference time information storage that stores the difference time information between the future time information and the reception time information Generated by the reception time information generation unit, and at least the reception time information generation unit that generates the reception time information of the reception unit based on the future time information and the difference time information received by the reception unit. A correction time information generation unit that generates correction time information for correction of the display time information correction unit based on the reception time information and at least processing time information of the time correction device. It is achieved by the time adjustment device timepiece device according to symptoms.

  According to the present invention, the subject is a receiving unit that receives a signal from a base station, a power supply unit that supplies power for communication by the receiving unit, and correction of display time information on a time information display unit. A display time information correction unit, wherein the signal received by the reception unit includes time information, and the time information is obtained from reception time information which is a time received by the reception unit. It is future time information after a predetermined time has elapsed, and the reception time information generation unit is based on at least the future time information received by the reception unit and difference time information between the future time information and the reception time information. A reception time information generation step of generating reception time information of the reception unit, a correction time information generation unit, the reception time information generated by the reception time information generation unit, and at least a processing time of the time correction device information Based is accomplished by time correction method characterized by having a modification time information generating step of generating a modified time information for modifying said display time information adjustment unit.

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
The embodiments described below are preferred specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. Unless otherwise stated, the present invention is not limited to these embodiments.

FIG. 1 is a schematic view showing a timepiece with a time adjustment device, for example, a wristwatch 10 with a time adjustment device (hereinafter referred to as a “watch”), which is a timekeeping device with a time adjustment device according to the present invention, and FIG. It is the schematic which shows the main hardware constitutions.
As shown in FIG. 1, a wristwatch 10 has a dial 12, a long hand, a short hand 13 and the like disposed on the surface of the wristwatch 10 and a display 14 formed of LEDs and the like for displaying various messages. The display 14 may be an LCD, an analog display or the like in addition to the LED.

As shown in FIG. 1, the wristwatch 10 has an antenna 11, and this antenna 11 is configured to receive signals from CDMA base stations 15a, 15b and the like. That is, the CDMA base station 15a and the like are base stations for a CDMA mobile phone communication network.
However, the wristwatch 10 according to the present embodiment does not perform telephone communication with the CDMA base station 15a and the like because it does not have a mobile phone function, but receives time information from a signal transmitted from the CDMA base station 15a and the like. However, it is intended to correct the time based on the signal. The contents of the signal transmitted from the CDMA base station 15a will be described later.
As shown in FIG. 1, the wristwatch 10 has a crown 28 that can be operated by the user.
The crown 28 is an example of an external input unit that can be operated by the user of the wristwatch 10.

First, the hardware configuration of the wristwatch 10 of FIG. 1 will be described. As shown in FIG. 2, the wristwatch 10 includes a bus 20, and a CPU (Central Processing Unit) 21, a RAM (Random Access Memory) 22, a ROM (Read Only Memory) 23, and the like are connected to the bus 20.
Further, for example, a CDMA base station radio wave receiver 24 that is a receiving unit that receives a signal from the CDMA base station 15 a or the like is connected to the bus 20. The CDMA base station radio wave receiver 24 has the antenna 11 of FIG.
Also connected to the bus 20 are a real time clock (RTC) 25 composed of an IC (semiconductor integrated circuit) or the like as a clock mechanism, a crystal oscillation circuit (TCXO) 26 with a temperature compensation circuit, and the like.

  As described above, the dial 12, the hand 13, the RTC 25, the TCXO 26, and the like in FIG. 1 are an example of a time information display unit that displays display time information.

  Further, a battery 27 is connected to the bus 20, and the battery 27 is an example of a power supply unit that supplies power for communication by a receiving unit (for example, the CDMA base station radio wave receiver 24).

  Further, the display 14 crown 28 of FIG. 1 is connected to the bus 20. As described above, the bus 20 is an internal bus having a function of connecting all devices and having an address and a data path. The RAM 22 processes a predetermined program and controls the ROM 23 and the like connected to the bus 20. The ROM 23 stores various programs and various information.

3 to 6 are schematic views showing the main software configuration of the wristwatch 10, and FIG. 3 is an overall view.
As shown in FIG. 3, the wristwatch 10 has a control unit 29, and the control unit 29 includes various programs in the various program storage units 30 shown in FIG. 3, various data in the first various data storage unit 40, and The second data storage unit 50 is configured to process various data.
In FIG. 3, the various program storage unit 30, the first various data storage unit 40, and the second various data storage unit 50 are shown separately, but actually the data is stored separately in this way. However, they are shown separately for convenience of explanation.
Note that the first various data storage unit 40 in FIG. 3 mainly shows data stored in advance. Further, the second various data storage unit 50 mainly shows data after the data in the first various data storage unit 40 is processed by the programs in the various program storage units 30.
4 is a schematic diagram showing data in the various program storage units 30 of FIG. 3, and FIG. 5 is a schematic diagram showing data in the first various data storage units 40 of FIG. FIG. 6 is a schematic diagram showing data in the second various data storage unit 50 of FIG.
7 and 8 are schematic flowcharts showing main operations and the like of the wristwatch 10 according to the present embodiment.

Hereinafter, the operations of the wristwatch 10 according to the present embodiment will be described according to the flowcharts of FIGS. 7 and 8, and the various programs and various data of FIGS.
Prior to the description of the flowchart, a portion of the CDMA mobile phone system related to the present embodiment will be described.
The CDMA mobile phone system has been in full operation since the system developed by Qualcomm Corp. in the United States was adopted in 1993 as one of the US standard systems "IS95". Since then, IS95A, IS95B, It has reached the present through revision of CDMA2000. In Japan, a mobile phone system is operated according to ARIB STD-T53.
In such a CDMA system, since the downlink (from the CDMA base station 15a or the like to the mobile station, in this embodiment, the wristwatch 10) is synchronous communication, the wristwatch 10 needs to synchronize with time data of the CDMA base station 15a or the like. Specifically, the signal transmitted from the CDMA base station 15a or the like has a pilot channel signal and a sync channel signal. The pilot channel signal is a signal transmitted at a different timing for each CDMA base station 15a and the like, for example, a pilot PN signal.

FIG. 9 is a schematic diagram showing the synchronization timing of the signals transmitted from the CDMA base stations 15a and 15b.
Since the signals transmitted from these CDMA base stations 15a and 15b are the same, in order to identify which CDMA base station 15a etc. this signal originated from, each CDMA base station 15a etc. A signal is transmitted at a timing different from that of the base station 15a or the like.
Specifically, this difference in timing appears as a difference in pilot PN signals transmitted from the CDMA base station 15a and the like. That is, for example, the CDMA base station 15b in FIG. 9 transmits a signal at a timing slightly delayed from the CDMA base station 15a. Specifically, the pilot PN offset is provided for 64 chips (0.052 ms (milliseconds)).
Thus, even if there are a large number of CDMA base stations 15a, etc., each of the CDMA base stations 15a, etc. is provided with a different pilot PN offset by an integer multiple of 64 chips. Thus, it is possible to easily grasp whether a signal has been received.

Further, a signal transmitted from the CDMA base station 15a or the like includes a sync channel signal, which is the sync channel message in FIG. FIG. 10 is a schematic diagram showing the contents of the sync channel message.
As shown in FIG. 10, the sync channel message includes the pilot PN signal data described above, for example, data indicating that the pilot PN offset data is 64 chips (0.052 ms) × N (0 to 512). ing. This data is represented by “PILOT_PN” in FIG.
The sync channel message also includes system time data which is GPS time data.
The GPS time is displayed in seconds since 0:00 every Sunday, and returns to 0 at 0:00 on the next Sunday. And since the week number of GPS is attached | subjected about this one week, it has the structure by which the receiving side can acquire GPS time by acquiring the data of a week number and elapsed time (second). This data is represented by “SYS_TIME” in FIG.

The sync channel message also includes “leap second” data for conversion to the Universal Coordinated Time (UTC). This data is represented by “LP_SEC” in FIG.
The sync channel message also includes a local offset time, which is time difference data for UTC in the country or region where the clock 10 is located. That is, for example, in the case of Japan, data indicating that the time is 9 hours plus UTC is stored.
This data is represented by “LTM_OFF” in FIG.
The sync channel message also includes summer time data indicating whether or not the country or region where the clock 10 is located adopts summer time or the like. In Japan, since the daylight saving time system is not adopted, the data is “0”. This data is represented by “DAYLT” in FIG.

  As described above, the pilot PN signal data in FIG. 10 is an example of base station error time information of a signal transmitted from a base station (for example, CDMA base station 15a), and the local offset information is converted into local time. It is an example of local time conversion information. The summer time data is an example of seasonal time information converted into seasonal time.

The sync channel message in FIG. 10 includes data having the above contents. Specifically, each data is sequentially transmitted in time series. The transmitted signal is 80 ms shown in FIG. The last superframe shown in FIG. 9 is transmitted in units of superframes and includes the last data of the sync channel message. That is, the last timing of the last superframe in FIG. 9 (the portions indicated by “E” and “EE” in FIG. 9) is the timing of completion of reception of the sync channel message.
Further, in the CDMA system, the above-described GPS time of the sync channel message in FIG. 10 is not the time in “E” in FIG. 9, and the time after 4 superframes (320 ms), that is, in FIG. The time is “F”.
Specifically, the pilot PN offset data described above is the time after four superframes from the last timing of the last superframe, with the time in the case of 0 chip (0 ms) as a reference.
This is based on the fact that CDMA is a system for communicating with a mobile phone in the first place. That is, after receiving the sync channel message shown in FIG. 10 from the CDMA base station 15a or the like, the mobile phone needs to make preparations for synchronous communication with the CDMA base station 15a or the like in the mobile phone.
Specifically, after preparing for the transition to the “standby state” which is the next stage, communication is performed in synchronization with the CDMA base station 15a and the like.
Therefore, in consideration of this preparation time, the CDMA base station 15a or the like transmits in advance a time after 320 ms, which is a future time, and the mobile phone that has received this time performs processing internally to prepare for it. After the end, it is configured that it becomes easier to synchronize with the CDMA base station 15a and the like at this time. In other words, these 4 superframes (320 ms) are the preparation time on the mobile phone side.

The above is the outline of the CDMA mobile phone system according to the present embodiment. Based on the above assumptions, the present embodiment will be described below.
When the time of the wristwatch 10 is corrected, first, as shown in ST1 of FIG. 7, the wristwatch 10 receives the pilot channel signal radio wave from the radio waves transmitted from the CDMA base station 15a and the like. Perform a scan.
In ST2, the wristwatch 10 is synchronized with the pilot channel signal from the nearest CDMA base station 15a and the like.
Specifically, the pilot PN synchronization program 31 of FIG. 4 synchronizes with a superframe every 80 ms as shown in FIG. That is, the signal radio wave is down-converted, and a baseband unit (not shown) mixes the pilot PN code with the signal of the pilot channel (walsh specific function) to synchronize.

Next, in ST3, the pilot PN synchronization program 31 determines whether or not the synchronization with the pilot channel signal of the CDMA base station 15a or the like is completed. If the synchronization is not completed, the service area table of the wristwatch 10 is held in ST4. Are all referred to (whether they have completed a round), and if not all are referred to, the process proceeds to ST5.
In ST5, the data of the CDMA base station 15a and the like in Japan, the United States, China, Canada, and the like are referred to, and ST1 pilot channel scan is performed based on the data.
That is, for example, if the wristwatch 10 is searching for a Japanese CDMA base station 15a and the like, but is actually located in the United States, it cannot synchronize with the pilot channel signal in ST3. Therefore, data of the CDMA base station 15a in the United States is acquired at ST5, and ST1 pilot channel scan is performed based on the data.

  On the other hand, if it is determined in ST4 that synchronization with the pilot channel signal cannot be achieved despite referring to all the service area tables held by the wristwatch 10, the process proceeds to ST6. In ST6, in order to indicate to the user that the time has not been corrected, for example, the user is informed by moving the second hand of FIG. 1 for 3 seconds. Then, the time adjustment is left to the user judgment, and the process ends.

On the other hand, when the synchronization with the pilot channel signal is completed in ST3, the process proceeds to ST7, switches to the sync channel, and starts receiving the sync channel message. Specifically, the sync channel message reception program 32 starts to receive a sync message as shown in FIG.
Next, in ST8, it is determined whether or not the reception of the sync channel message is completed. When the reception of the sync channel message is not completed, it is determined whether or not a timeout occurs in ST9. In ST7, the sync channel message is received again.

On the other hand, when the reception of the sync channel message is completed in ST8, the process proceeds to ST10, and the CDMA base station radio wave receiver 24 of FIG. 3 stops the signal reception. Specifically, the receiver control program 33 operates to stop radio wave reception from the CDMA base station 15a and the like of the CDMA base station radio wave receiver 24. That is, the radio wave reception is terminated at the timing indicated by “E” or “EE” which is the timing of the end of the last superframe in FIG.
The wristwatch 10 has received all the sync channel messages shown in FIG. 10, and the sync channel messages are stored in the sync channel message data storage unit 51 of FIG. 6 as sync channel message data 51a.

Next, the process proceeds to ST11. After ST11, the time correction data is created based on the information of the sync channel message already acquired from the CDMA base station 15a and the like, and the time is actually adjusted.
First, in ST11, since the wristwatch 10 is located in, for example, Japan, the GPS time, leap second, local offset time (in the case of Japan, 9 hours are added to UTC), summer time ( In the case of Japan, there is no daylight saving time, so 0 hour is added), and the first local time calculation program 34 in FIG. 4 operates to calculate the first local time, for example, the first Japan time. .
Specifically, UTC time is calculated based on leap second data based on GPS time, and based on this UTC time, for example, 9 hours is added as a local offset time to obtain Japan time. In Japan, since daylight saving time is not adopted, daylight saving time is not substantially corrected. In countries that use the daylight saving time system such as the United States, the correction of daylight saving time is an extremely accurate time correction.

In the present embodiment, the first Japan time is calculated, and this time becomes basic time data based on the GPS time.
In this way, the calculated first Japan time is stored as the first local time data 52a in the first local time data storage unit 52 of FIG.

The first local time data 52a calculated here will be described. The first local time data 52a is as follows when described with reference to FIG. In other words, if the wristwatch 10 receives the signal of the CDMA base station 15b of FIG. 9 and acquires the sync channel message, the received time (GPS time) is the above-described pilot PN offset data of 0 chip (0 ms). The time information (time at “F” in the example of FIG. 9) is four superframes (320 ms) after the last timing of the last superframe on the basis of the case time.
However, since the pilot PN offset of the CDMA base station 15b of FIG. 9 is, for example, 64 chips (0.052 ms), the actual reception timing is different from the accurate GPS time accordingly. That is, “EE”, which is the timing at which the base station 15b in FIG. 9 actually receives the last superframe, is the time obtained by adding the pilot PN offset to the GPS time acquired by the wristwatch 10.

For this reason, the following processing is performed in the present embodiment. That is, in ST12, the following correction is applied to the primary local time data 52a of FIG. That is, by subtracting 320 ms (4 superframes) from the primary local time data 52a, the time at “F” in FIG. 9 is made time information at “E”. Further, since the signal of the CDMA base station 15b has a pilot PN offset of 0.052 ms, the corresponding amount is added.
Then, for example, Japan time is generated based on the correct GPS time when the last superframe reception is completed (EE).
Such a calculation is performed by the secondary local time calculation program 35 in FIG. 4 based on the primary local time data 52a in FIG. 6, the differential time data 41a in FIG. 5, the pilot PN offset time data 42a, and the like. The result is stored in the secondary local time data storage unit 53 as the secondary local time data 53a of FIG.
An example of the differential time data 41 a in FIG. 5 is the above-described data of 320 ms (4 superframes), and is stored in the differential time data storage unit 41. An example of the pilot PN offset time data 42 a is the above-described data of 64 chips (0.052 ms), and is stored in the pilot PN offset time data storage unit 42.

In addition, the GPS time acquired from the sync channel message in ST11 is reception time information (for example, time information at “E” in FIG. 9) that is received by a receiving unit (for example, the CDMA base station radio wave receiver 24). Etc.) is an example of future time information after a predetermined time has elapsed (for example, after 320 ms has elapsed). Moreover, the difference time data 41a of FIG. 5 is an example of the difference time information.
Further, the first local time calculation program 34 and the second local time calculation program 35 receive the future time information (for example, “F” in FIG. 9) received by the receiving unit (for example, the CDMA base station radio wave receiver 24). An example of a reception time information generation unit that generates reception time information (for example, second local time data 53a) of the reception unit based on difference time information (for example, difference time data 41a). It has become. ST12 is also an example of a reception time information generation step.

By the way, the second local time data 53a calculated in ST12 is a highly accurate time that matches the GPS time as described above, but there are times required for the calculation of ST11 and ST12, and this time is not considered. Then, the time will be different (mad) by the calculation time.
Therefore, step ST13 is performed. That is, the final local time is calculated by adding the processing delay time to the second local time data 53a of FIG. That is, the processing delay time corresponds to the time required for the above-described calculation of the wristwatch 10, and the time is determined by the wristwatch 10.
Therefore, in the present embodiment, as shown in FIG. 5, the processing delay time data 43a is stored in the processing delay time data storage unit 43 as a fixed value in advance. Then, the final local time calculation program 36 in FIG. 4 adds the processing delay time data 43a to the second local time data 53a in FIG. 6 to obtain final local time data 54a that is more accurate time information. Stored in the last local time data storage unit 54.

  The last local time data 54a generated in this way is extremely accurate time information that matches the GPS time. The processing delay time is an example of processing time information, and ST13 is an example of a correction time information generation step.

  Next, the process proceeds to ST14. In ST14, the RTC and time correction program 37 in FIG. 4 corrects the RTC 25 in FIG. 3, the hands 13 in FIG. 1, and the like based on the final local time data 54a in FIG. 6, and the time correction is completed.

  Thus, the RTC and time correction program 37 is an example of a display time information correction unit that corrects display time information (for example, the RTC 25 and the hands 13) of the time information display unit. The final local time calculation program 36 is an example of a correction time information generation unit that generates correction time information (for example, final local time data 54a) for correction that is corrected by the RTC and the time correction program 37.

Thus, according to the present embodiment, since the CDMA base station radio wave receiver 24 stops receiving radio waves from the CDMA base station 15a and the like in ST10, the power consumption of the battery 27 can be reduced.
This will be specifically described with reference to FIG. FIG. 9C shows a conventional power supply sequence in which a sync channel message is received from the CDMA base station 15b and then time synchronization is performed. As shown in FIG. 9, since the signal is received up to “FF” in FIG. 9, the power supply is in the ON state.
On the other hand, the power supply sequence of the present embodiment is (D) in FIG. As shown in (D), the reception of the signal ends at “EE” in FIG. 9, and no communication is performed thereafter.
For this reason, since the wristwatch 10 of the present embodiment can reduce power consumption, it can be mounted on a device such as a watch that requires ultra-low power, and can perform time correction with extremely high accuracy. It has become.

By the way, the process proceeds to ST15. In ST15, the time correction interval timer operates. That is, the time correction start determination program 38 of FIG. 4 operates and refers to the time correction interval data 44a of FIG. The time correction interval data 44a is, for example, 24 hours. Further, such time correction interval data 44 a is stored in the time correction interval data storage unit 44.
For this reason, in ST16, the next time correction is started after 24 hours have elapsed from the previous time correction, and the steps after ST1 are executed.

8 and 9, the local offset time and summer time data in FIG. 10 are automatically corrected based on the sync channel message received from the CDMA base station 15a or the like. The user may be able to set.
In this case, the local offset time input using the crown 28 or the like of FIG. 3 is stored in the input local offset time data storage 55 as the input local offset time data 55a of FIG. Similarly, the input daylight saving time data 56a is stored in the input daylight saving time data storage unit 56 as input daylight saving time data 56a.
In this case, in the above-described ST11, the first local time is calculated based on the input data, so that the time correction as desired by the user can be performed.

  The present invention is not limited to the above-described embodiment.

It is the schematic which shows the wristwatch with a time adjustment apparatus which is the time measuring apparatus with a time adjustment apparatus which concerns on this invention, for example. It is the schematic which shows the main hardware constitutions etc. inside the wristwatch of FIG. It is a schematic whole figure showing main software composition etc. of a wristwatch. It is the schematic which shows the data in the various program storage part of FIG. It is the schematic which shows the data in the 1st various data storage part of FIG. It is the schematic which shows the data in the 2nd various data storage part of FIG. It is a schematic flowchart which shows the main operation | movement etc. of the wristwatch concerning this Embodiment. It is another schematic flowchart which shows the main operation | movement etc. of the wristwatch concerning this Embodiment. It is the schematic which shows the synchronous timing etc. of the signal transmitted from a CDMA base station. It is the schematic which shows the content of a sync channel message.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Wristwatch with time correction device, 12 ... Dial, 15a and 15b ... CDMA base station, 24 ... CDMA base station radio receiver, 25 ... Real time clock (RTC), 27 ..Battery 31 ... Pilot PN synchronization program 32 ... Sync channel message reception program 33 ... Receiver control program 34 ... Primary local time calculation program 35 ... Second Next local time program 36 ... Final local time calculation program 37 ... RTC and time correction program 38 ... Time correction start determination program 41a ... Differential time data 42a ... Pilot PN offset Time data, 43a ... processing delay time data, 44a ... time correction interval data, 51a ... thin Channel message data, 52a · · · first local time data, 53a · · · second local time data, 54a · · · last local time data

Claims (8)

A receiver for receiving a signal from the base station;
A power supply for supplying power for the receiver to communicate;
A time correction device having a display time information correction unit for correcting display time information of the time information display unit,
The signal received by the reception unit includes time information, and this time information is future time information after a predetermined time has elapsed from reception time information that is a time received by the reception unit,
A difference time information storage unit for storing difference time information between the future time information and the reception time information;
At least a reception time information generation unit that generates reception time information of the reception unit based on the future time information and the difference time information received by the reception unit;
A correction time information generation unit that generates correction time information for correction of the display time information correction unit based on the reception time information generated by the reception time information generation unit and at least processing time information of the time correction device; The time correction apparatus characterized by having. The time information received by the receiving unit includes at least GPS time information of a GPS satellite, base station error time information of a signal transmitted from the base station, and a UTC that converts the GPS time information into Coordinated Universal Time (UTC). Has conversion information and local time conversion information to convert to local time,
The reception time information generation unit generates the reception time information based on at least the GPS time information, the UTC conversion information, the local time conversion information, the base station error time information, and the difference information. The time correction apparatus according to claim 1, wherein   The time correction apparatus according to claim 2, wherein the time information includes seasonal time information converted into seasonal time.   The time correction apparatus according to claim 3, wherein the local time conversion information and the seasonal time information of the time information can be input via an external input unit operable by a user. .   5. The time correction apparatus according to claim 1, wherein processing time information of the time correction apparatus is stored as a fixed value.   6. The signal transmitted from the base station is a signal transmitted from the base station in a CDMA (Code Division Multiple Access) system mobile phone communication network. The time correction apparatus in any one of. A receiver for receiving a signal from the base station;
A power supply for supplying power for the receiver to communicate;
A time information display unit for displaying the display time information;
A display time information correction unit that corrects the display time information of the time information display unit, and a time measuring device with a time correction device,
The signal received by the reception unit includes time information, and the time information is future time information after a predetermined time from reception time information that is a time received by the reception unit,
A difference time information storage unit for storing difference time information between the future time information and the reception time information;
At least a reception time information generation unit that generates reception time information of the reception unit based on the future time information and the difference time information received by the reception unit;
A correction time information generation unit that generates correction time information for correction of the display time information correction unit based on the reception time information generated by the reception time information generation unit and at least processing time information of the time correction device; And a time measuring device with a time adjusting device. A receiver for receiving a signal from the base station;
A power supply for supplying power for the receiver to communicate;
A display time information correction unit for correcting display time information of the time information display unit, and a time correction method comprising:
The signal received by the reception unit includes time information, and this time information is future time information after a predetermined time has elapsed from reception time information that is a time received by the reception unit,
A reception time information generation unit that generates reception time information of the reception unit based on at least the future time information received by the reception unit and difference time information between the future time information and the reception time information. A time information generation step;
A correction time information generation unit generates correction time information for correction of the display time information correction unit based on the reception time information generated by the reception time information generation unit and at least processing time information of the time correction device And a correction time information generation step.

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