JP2009085604A - Time correction apparatus, time measuring instrument with same, and time correction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a time correction apparatus etc. capable of indicating highly accurate radio wave conditions to users. <P>SOLUTION: The time correction apparatus 10 includes a reception part 24 for receiving specific signals including transmission-side time information; a time information management part 25 for managing reception-side time information; a correction time information generating part 42 for generating correction time information for correcting the reception-side time information on the basis of the transmission-side time information; and a reception-side time information correcting part 44 for correcting the reception-side time information on the basis of the correction time information. The reception part has a signal synchronization part 17a for synchronizing with the specific signals. The time correction apparatus 10 includes a synchronizing-operation time information acquisition part 29 for acquiring synchronizing-operation time information of the signal synchronization part; a synchronization-related reception environment information storing part 53 for storing the information which relates the synchronizing-operation time information to reception-environment information of the specific signals; a reception-environment information selection part 34 for selecting reception environment information on the basis of the synchronizing operation time information; a display part 14 for displaying reception-environment information selected by the reception-environment information selection part; and an external-reception control part 33 for controlling the reception of the reception part. <P>COPYRIGHT: (C)2009,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.

Conventionally, the radio wave condition of a mobile terminal that receives radio waves is affected by the position of the mobile terminal, surrounding obstacles, and the like, and changes sequentially. For this reason, radio wave intensity information display is used to indicate to the user the degree of radio wave conditions available for the current mobile terminal. This radio wave intensity information display is displayed by the number of display of a plurality of antenna bars, for example (for example, Patent Document 1).
JP 2006-254002 A (paragraph “0003” etc.)

  However, such radio wave intensity information roughly indicates a radio wave situation, and there is a problem that it is inaccurate information.

  Accordingly, it is an object of the present invention to provide a time adjustment device, a time measuring device with a time adjustment device, and a time adjustment method capable of showing a highly accurate radio wave condition to a user.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

[Application Example 1]
A reception unit that receives a specific signal including transmission side time information transmitted from a base station, a time information management unit that manages reception side time information, and a correction that corrects the reception side time information based on the transmission side time information A correction time information generation unit that generates time information; and a reception side time information correction unit that corrects the reception side time information based on the correction time information. The reception unit synchronizes with the specific signal. A synchronous operation time information acquisition unit for acquiring synchronous operation time information, which is time information for the synchronous operation of the signal synchronization unit, and the synchronous operation time information and the specific signal A synchronization-related reception environment information storage unit that stores synchronization-related reception environment information for associating with the reception environment information; a reception environment information selection unit that selects the reception environment information based on the synchronization operation time information; A display unit that displays the received environment information environmental information selection unit selects the time adjustment device also having, an external reception control unit that controls the reception of said specific signal of said receiver.

According to the above configuration, the receiving unit includes the signal synchronization unit that performs the synchronization operation for synchronizing with the specific signal, and acquires the synchronization operation time information that is time information for the signal synchronization unit to perform the synchronization operation. A time information acquisition unit, a synchronization-related reception environment information storage unit for storing synchronization-related reception environment information for associating synchronization operation time information and reception environment information of a specific signal, and selection of reception environment information based on the synchronization operation time information A reception environment information selection unit; a display unit that displays reception environment information selected by the reception environment information selection unit; and an external control unit that controls reception of a specific signal of the reception unit.
For this reason, reception environment information such as radio field intensity is determined based on the synchronization operation time information of the signal synchronization unit, and the reception environment information is displayed on the display unit, so that the reception environment information is highly accurate.
That is, the environment in which signals are easily received is specifically an environment in which time is not required for signal synchronization. For this reason, the signal synchronization unit actually performs a synchronization operation, measures the time required for synchronization, etc., and determines the reception environment based on the length of the measured time, thereby obtaining reception environment information with extremely high accuracy.
Since such reception environment information is displayed on the display unit, the user who has visually recognized the displayed reception environment information can immediately determine the difficulty of signal reception in the environment.
If the user determines that signal reception is difficult, the user can stop receiving the specific signal by operating the external reception control unit.
In this way, in situations where signal reception is difficult, it is possible to prevent unauthorized energy consumption by stopping the operation of the receiving unit.

[Application Example 2]
Preferably, the quality of the reception environment information is divided into a plurality of stages according to the length of the synchronous operation time information.

According to the above configuration, the quality of the reception environment information is divided into a plurality of stages according to the length of the synchronous operation time.
That is, when the synchronization operation time is short, the reception environment is good. Conversely, when the synchronization operation time is long, the reception environment is bad. For this reason, the reception environment information is divided into a plurality of stages such as H, M, and L according to the difference in the synchronization operation time, and the reception environment is displayed to the user by displaying this stage (H, M, and L) on the display unit. Can convey information in an easy-to-understand manner.

[Application Example 3]
Preferably, the time adjustment device is configured to display on the display unit and notify the user that the signal synchronization unit has failed in the synchronization operation.

  According to the above configuration, since the signal synchronization unit is configured to display on the display unit and notify the user that the synchronization operation has failed, the user recognizes that the reception environment is the worst situation. be able to.

[Application Example 4]
Preferably, the specific signal includes future time information after a fixed time elapses transmitted from the base station, and the correction time information is generated based on the future time information and time change information for changing the future time information. A time correction device.

According to the above configuration, it includes the future time information after a certain time elapses transmitted from the base station, and the corrected time information is generated based on the future time information and the time change information for changing this future time information. ing.
For this reason, for example, even if the future time information is 320 ms (milliseconds) after the reception, it is very close to the future time. By adding, the correction time information as a whole becomes 2 s (seconds) after the reception, and the time correction device can secure a long time of 2 s (seconds) until the time is corrected.
Therefore, even when the processing capacity of the control device (CPU or the like) of the time adjustment device is low and it takes a long time to acquire future time information, it is easy to set an arbitrary processing time according to the time. Can do.
For this reason, even a control device with a low processing capability such as computing capability can correct the time by using a cellular phone communication network such as a CDMA system, and correct the time without cost. Can do.

[Application Example 5]
A reception unit that receives a specific signal including transmission side time information transmitted from a base station, a time information management unit that manages reception side time information, and a correction that corrects the reception side time information based on the transmission side time information A correction time information generation unit that generates time information; and a reception side time information correction unit that corrects the reception side time information based on the correction time information. The reception unit synchronizes with the specific signal. A synchronous operation time information acquisition unit for acquiring synchronous operation time information, which is time information for the synchronous operation of the signal synchronization unit, and the synchronous operation time information and the specific signal A synchronization-related reception environment information storage unit that stores synchronization-related reception environment information for associating with the reception environment information; a reception environment information selection unit that selects the reception environment information based on the synchronization operation time information; A display unit that displays the received environment information environmental information selection section selects, time adjustment device timepiece apparatus characterized by having, an external reception control unit that controls the reception of said specific signal of said receiver.

[Application Example 6]
A reception unit that receives a specific signal including transmission side time information transmitted by a base station, an external reception control unit that controls reception of the specific signal of the reception unit, and a time information management unit that manages reception side time information; A correction time information generating unit for generating correction time information for correcting the reception side time information based on the transmission side time information; and a reception side time information correction for correcting the reception side time information based on the correction time information. And the receiving unit includes a signal synchronization unit that performs a synchronization operation for synchronizing with the specific signal, and includes synchronization operation time information that is time information for the signal synchronization unit to perform a synchronization operation. The synchronization operation time information acquisition unit to acquire, the synchronization related reception environment information storage unit that stores the synchronization related reception environment information that associates the synchronization operation time information and the reception environment information of the specific signal, and the reception environment information selection unit, Time correction method characterized by selecting the reception environment information based on the period operation time information, displaying the reception environment information which the reception environment information selection unit selects the display 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, which is configured to receive signals from base stations such as CDMA base stations 15a and 15b. 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 external input unit that can be operated by the user of the wristwatch 10, and is also an example of an external reception control unit that controls reception of a specific signal of the reception unit, as will be described later.

First, the hardware configuration of the wristwatch 10 of FIG. 1 will be described. As shown in FIG. 2, the wristwatch 10 includes an IF (interface), an I / O (input / output (input / output)), and a power supply line 20. The IF, I / O, and power supply line 20 include a CPU. (Central Processing Unit) 21, RAM (Random Access Memory) 22, ROM (Read Only Memory) 23, and the like are connected.
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 IF, I / O, and power supply line 20. The CDMA base station radio wave receiver 24 has the antenna 11 of FIG.
Further, the IF, I / O, and power supply line 20 are also connected with a real time clock (RTC) 25 composed of an IC (semiconductor integrated circuit) that is a clock mechanism, a crystal oscillation circuit with temperature compensation circuit (TCXO) 26, and the like. Yes.

As described above, the RTC 25 and the like in FIG. 2 are an example of a time information management unit that manages reception-side time information.
In addition, a battery 27, a display 14, a timer 29, and the like are connected to the IF, I / O, and power supply line 20. The function of the timer 29 will be described later.
Thus, the IF, I / O, and power supply line 20 are internal wirings that have a function of connecting all devices and have an address and a data bus. In addition to processing a predetermined program, the CPU 21 controls the IF, I / O, ROM 23 connected to the power supply line 20, and the like. The ROM 23 stores various programs and various information.

FIG. 3 is a schematic diagram showing the main configuration of the CDMA base station radio receiver 24 of FIG.
Before describing each configuration, “spread spectrum” used in the premise of the CDMA system will be described.
The process of processing a signal to place it on a radio wave is usually called “modulation”. For example, data or the like is converted into a digital signal, and then “modulation” is performed. Ordinary “modulation” uses a specific frequency band and places a signal on a reference carrier frequency. In this case, communication is limited to a specific frequency band, and it is difficult to effectively use the frequency band.
Therefore, the CDMA method has been adopted as a method using a wide frequency band. In the CDMA system, “spread modulation” is further performed after the above “modulation”.
For “spread modulation”, a spread code called “PN code” (a code in which +1 and −1 or 0 and 1 are arranged randomly) is used.
In spread modulation, the spread code is multiplied with a signal to obtain a high-frequency digital signal. As a result, the signal is spread over a wide band and the output is reduced.
The spread signal (high frequency digital signal) is received by the receiver side, and the received signal is multiplied by the same spread code as the above-mentioned “PN code” (despreading) and demodulated, etc. Thus, it can be used as a source signal, and data can be obtained.

With this assumption, FIG. 3 will be described. As shown in FIG. 3, a high frequency receiving unit 16 is connected to the antenna 11. The high-frequency receiving unit 16 is configured to down-convert radio waves from the CDMA base station 15 a received by the antenna 11.
A baseband unit 17 is connected to the high frequency receiving unit 16. In the baseband unit 17, a pilot PN synchronization unit 17a is provided. As will be described later, the pilot PN synchronization unit 17a has a configuration in which the pilot PN code is mixed with the pilot channel signal down-converted by the high-frequency receiving unit 16 to synchronize the signal. Thus, the pilot PN synchronization unit 17a is an example of a signal synchronization unit. This pilot PN code indicates a code for synchronization among the above-mentioned “PN codes”.

As shown in FIG. 3, a start timing generator 17b is connected to the pilot PN synchronization unit 17a.
That is, when the pilot PN synchronization unit 17a synchronizes the above-described signals, the timing is input to the start timing generation device 17b, and the start timing generation device 17b receives the input to generate the start timing. .

As shown in FIG. 3, the start timing generator 17b is connected to a divide-by-64 counter 17c. For this reason, the start timing generated by the start timing generator 17b is input to the 64 frequency division counter 17c and frequency division is started.
The divide-by-64 counter 17c generates a walsh code (32) by dividing the frequency (1.2288 MHz), which is the chip rate of the pilot PN, by 64, as will be described later. The walsh code (32) generated in this way is mixed with a sync channel signal received by the antenna 11, and time information is extracted. The processing of these signals will be described later.

The start timing generator 17b is configured to supply a start timing at which the 64 frequency division counter 17c starts frequency division of, for example, a pilot PN chip rate (1.2288 MHz), which is a fundamental frequency.
The 64 frequency dividing counter 17c is configured to divide a frequency of 1.2288 MHz, which is a basic unit of the pilot PN signal, and generate, for example, a walsh code (32) that is a time information extraction signal.

As shown in FIG. 3, the baseband unit 17 includes a digital filter 17d and a deinterleave / decoding unit 17e. In other words, the radio wave received by the antenna 11 is demodulated through the digital filter 17d through the deinterleave and decoding unit 17e after the walsh code (32) is mixed as described above, and as a sync channel message described later. It is configured to be acquired.
That is, it is possible to demodulate a signal transmitted for the first time through the deinterleaving and decoding unit 17e, and to acquire original data transmitted by the CDMA base station 15a and the like.

4 to 7 are schematic views showing the main software configuration of the wristwatch 10, and FIG. 4 is an overall view.
As shown in FIG. 4, the wristwatch 10 includes a control unit 18, which controls various programs in the various program storage units 30 illustrated in FIG. 4, various data in the first various data storage unit 50, and The second various data storage unit 70 is configured to process various data.
In FIG. 4, the various program storage unit 30, the first various data storage unit 50, and the second various data storage unit 70 are shown separately, but actually the data is stored separately in this way. However, they are shown separately for convenience of explanation.
The first various data storage unit 50 in FIG. 4 mainly shows data stored in advance. Further, the second various data storage unit 70 mainly shows data after the data in the first various data storage unit 50 is processed by the programs in the various program storage units 30.
FIG. 5 is a schematic diagram showing data in the various program storage units 30 in FIG. 4, and FIG. 6 is a schematic diagram showing data in the first various data storage units 50 in FIG. FIG. 7 is a schematic diagram showing data in the second various data storage unit 70 of FIG.
8 and 9 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. 8 and 9, 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 and IS95B , Through the revision of CDMA2000. In Japan, a mobile phone system is operated according to ARIB STD-T64.
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 be synchronized with a signal from 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. 10 is a schematic diagram illustrating the synchronization timing of 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.
This difference in timing appears as a difference in pilot PN signals transmitted from the CDMA base station 15a and the like. For example, the signal of the CDMA base station 15b in FIG. 10B is transmitted at a timing slightly delayed from the signal of the CDMA base station 15a in FIG. 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. This pilot PN offset is base station identification time difference information.

A signal (an example of a specific 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. 11 is a schematic diagram showing the contents of the sync channel message.
As shown in FIG. 11, 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 that is GPS time data based on an atomic clock of a GPS (Global Positioning System) satellite. This system time is an example of transmission side time information.
The system time is an integrated time in units of 80 ms from midnight on January 6, 1980. 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 includes a local offset time, which is time difference data for UTC in the country or region where the wristwatch 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 wristwatch 10 is located adopts daylight saving 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.

The sync channel message in FIG. 11 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. 10 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. 10 (the portion indicated by “EE” in FIG. 10A and “EE” in FIG. 10B) is the timing for completing the reception of the sync channel message.
The system time included in the above sync channel message is determined based on the last timing (“E” and “EE”) of the last superframe.
Specifically, in the CDMA system, the above-described system time of the sync channel message in FIG. 11 is not the time in “E” and “EE” in FIG. 10, but the time after 4 superframes (320 ms), That is, the time is “F” and “FF” in FIG. This time is an example of future time information.

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. 11 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.

Thus, when the wristwatch 10 receives the signal of the base station 15b, the last timing of the last superframe when the pilot PN offset is converted should theoretically be “EE”.
However, the signal of the base station 15b in FIG. 10B including the above-described future time information after 4 superframes is received by the antenna 11 of the wristwatch 10 in FIG. Reception is possible only after being synchronized by the pilot PN synchronization unit 17a of the baseband unit 17 and processed by the deinterleave and decoding unit 17e.
The processing time in the deinterleaving / decoding unit 17e and the like is the demodulation / decoding processing delay time of FIG. 10C, and is 53 ms, for example.
Therefore, in consideration of this demodulation and decoding processing delay time, the last timing of the last superframe when the pilot PN offset is converted when the watch 10 actually receives the signal of the base station 15b is theoretically It shifts to “EEE” in FIG. 10C instead of “EE”. Such demodulation / decoding processing delay time is reception processing delay time information.

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, the CDMA base station radio receiver 24 shown in FIG. 2 of the wristwatch 10 transmits radio waves transmitted from the CDMA base station 15a of FIG. 1 as shown in ST1 of FIG. Among them, the pilot channel scan for receiving the pilot channel signal radio wave is performed, the pilot channel signal from the CDMA base station 15a or the like is received, and the pilot PN code is mixed with the received pilot channel signal to achieve synchronization. Try to.
When synchronized with a signal from the CDMA base station 15a or the like, the walsh code (0) is superimposed (despread) to acquire data.

Specifically, the pilot PN signal reception synchronization program 31 of FIG. 5 operates, and the pilot PN synchronization unit 17a of FIG. 3 operates from the pilot PN code (the CDMA base station 15a etc.) which is the pilot PN synchronization data 51 of FIG. The same code as the pilot PN code to be transmitted) and the Walsh code (0) are mixed and synchronized as shown in FIG. At this time, since the walsh code to be mixed is (0), it is not necessary to prepare a special code.
Since the received pilot channel signal includes a pilot PN code, the same pilot PN code and a walsh code (0) for reception are also required on the CDMA base station radio receiver 24 side. With this configuration, the CDMA base station radio wave receiver 24 can synchronize with the pilot channel signal from the CDMA base station 15a and the like, can despread, and can acquire data.
Note that the ST1 pilot channel scan is automatically executed at regular time intervals (for example, 24 hours), as will be described in detail later in ST18.

FIG. 12A is a schematic diagram showing a state in which the CDMA base station radio receiver 24 is synchronized with the pilot channel signal.
As shown in FIG. 12 (a), the pilot channel signal has a portion where 15 zeros “0” are continuously arranged, and the last zero “0” portion (as indicated by the vertical arrow in FIG. 12 (a)). 6 is included in the pilot PN synchronization data 51 shown in FIG. 6.

The synchronization of the signal from the CDMA base station 15a and the like in ST1 does not immediately succeed at the start of the synchronization operation, but requires a predetermined time.
For example, if the wristwatch 10 is placed outdoors, synchronization is completed in about 27 ms (milliseconds), but if it is placed indoors, it may take about 500 ms.
Signal synchronization is performed by operating the pilot PN synchronization unit 17a of FIG. 3 as described above. At this time, the high frequency receiving unit (RF unit) 16 is also operated, and the following power is consumed. The
In terms of conversion, the high frequency receiving unit 16 is 72 mW (milliwatts) and the pilot PN synchronization unit 17a is 38 mW, which is 110 mW in total.
If the above-described synchronization time is 27 ms, the power consumption is 27 ms × 110 mW, which is about 3 mWs (milliwatt seconds).

  On the other hand, if the above-mentioned synchronization time is 500 ms, the power consumption amount is 55 mWs at 500 ms × 110 mW. As described above, the power consumption varies greatly depending on the operation time of the pilot PN synchronization unit 17a.

For other power consumption, the following operation is executed. That is, after synchronization of the pilot PN synchronization unit 17a, the baseband unit 17 of the CDMA base station radio receiver 24 of FIG. 3 operates to despread, decode, calculate, etc. the signal of the CDMA base station 15a, The system time in FIG. 11 described above is acquired. The time at this time is about 480 ms at the maximum, and the power consumption is 18 mW.
Regarding the acquisition of the system time and the like, since the high frequency receiving unit 16 operates and receives a signal at the same time, it is necessary to consider the power consumption of the high frequency receiving unit 16. Since the high-frequency receiving unit 16 has 72 mW, the total of these is (18 mW + 72 mW) × 480 ms = about 43 mWs.

As described above, if the synchronization time of the pilot PN synchronization unit 17a in FIG. 3 is long, it means that the amount of power consumption increases, but if the synchronization time is long, the wristwatch 10 receives a signal from the CDMA base station 15a or the like. It also means being in a difficult environment.
On the other hand, if the synchronization time is short, it indicates that the amount of power consumption is small and the signal is easily received.
Therefore, in the present embodiment, as will be described later, the display 14 shows the quality of the reception environment based on the synchronization time, and notifies the user.
For this reason, a user who knows on the display 14 that the reception environment is bad (long synchronization time) operates the crown 28 in FIG. 2 to receive a signal from the CDMA base station 15a of the wristwatch 10 or the like. The operation can be stopped, and this operation can avoid wasting the battery 27 of the wristwatch 10 wastefully.
Details of this configuration and the like will be described later, and here, measurement of such a synchronization time will be described.
Specifically, as shown in ST1, the timer 29 in FIG. 2 starts counting at the time of starting to attempt synchronization. That is, the timer control program 32 of FIG. 5 operates and starts counting.

Next, in ST2, the pilot PN signal reception synchronization program 31 determines whether or not the synchronization with the pilot channel signal of the CDMA base station 15a or the like has been completed. If the synchronization is not completed, the process proceeds to ST3.
In ST3, it is determined whether all the service area tables of the wristwatch 10 have been referred (whether they have made a complete cycle). If all have not been referred to, the process proceeds to ST4.
In ST4, the service area data 54 of FIG. 6 which is data of the CDMA base station 15a and the like in Japan, the United States, China, Canada and the like is referred to, and ST1 pilot channel scan and the like are performed based on the data.
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 ST1. Therefore, in ST4, data of the US CDMA base station 15a, etc. is acquired, and ST1 pilot channel scan or the like is performed based on the data.

On the other hand, in ST4, when all of the service area data 54 possessed by the wristwatch 10 is referred to but cannot be synchronized with the pilot channel signal, the process proceeds to ST5. In ST5, in order to indicate to the user that the time cannot be adjusted, for example, this is displayed on the display 14 of FIG. 2 to notify the user.
Specifically, the display control program 33 of FIG. 5 is operated and executed. That is, in this embodiment, the signal synchronization unit is configured to display on the display unit (the display 14 is an example) and notify the user that the synchronization operation has failed.
In the present embodiment, the operation of the pilot PN signal synchronization program 31 in FIG. 5 can be stopped by operating, for example, the crown 28 which is an external reception control unit.
Therefore, if the user of the wristwatch 10 finds that it is difficult to receive a signal from the display 14, the user of the pilot PN signal synchronization program 31 of FIG. 5 operates by operating the crown 28 of FIG. The configuration is such that the operation can be stopped and wasteful consumption of the battery 27 can be avoided.

On the other hand, when the synchronization with the pilot channel signal is completed in ST2, the process proceeds to ST6. In ST6, the timer control program 32 operates, stops the count of the timer 29, and stores the required synchronization time which is the time data of the timer 29 as the required synchronization time data 72 of FIG.
Thus, the synchronization required time data 72 is an example of synchronous operation time information, and the timer control program 32 is an example of a synchronous operation time information acquisition unit.
In ST6, the start timing generator 17b inputs the start timing to the divide-by-64 counter 17c.
Specifically, the start timing generator control program 37 in FIG. 5 operates to generate a start timing, which is input to the divide-by-64 counter 17c in FIG.
This point will be specifically described with reference to FIG. FIG. 12B is a schematic diagram showing the relationship between the start timing and the operation of the divide-by-64 counter 17c.
As shown in FIG. 12B, the output of the divide-by-64 counter is the vertical arrow portion shown in FIG. 12A, which is the synchronization timing with the pilot channel signal shown in FIG. Is also input to the 64 frequency division counter 17c at this vertical arrow portion.

Next, the process proceeds to ST7. In ST7, the synchronization level is selected based on the required synchronization time data 72 of FIG.
Hereinafter, this synchronization level will be described. In the present embodiment, the reception environment of the signal in which the wristwatch 10 is arranged is shown in stages based on the synchronization required time data 72 and the stage is displayed on the display 14 to notify the user.
This stage is the synchronization level data 53 shown in FIG. The synchronization level data 53 will be described with reference to FIG.
FIG. 13 is a schematic diagram showing the relationship between the reception power (dBm) of the CDMA base station radio receiver and the average synchronization time (s) of the pilot PN synchronization unit 17a of the CDMA base station radio receiver 24.
As shown in FIG. 13, it can be seen that the greater the received power, the shorter the average synchronization time.
That is, the shorter the synchronization time, the better the reception environment, and the longer the synchronization time, the worse the reception environment.

Therefore, in this embodiment, synchronization level data 53 as shown in FIG. 6 is generated based on the data of FIG.
Specifically, when the synchronization required time of the pilot PN synchronization unit 17a is 0 to 0.005 (s), it is set to the “H” level, that is, the reception good level. When the synchronization required time is more than 0.005 to 0.2 (s), the “M” level, that is, the reception normal level is set. Furthermore, when the required synchronization time exceeds 0.2, the “L” level, that is, the reception difficulty level is set.
As described above, the synchronization level data 53 is an example of synchronization-related reception environment information that associates the synchronization operation time information (synchronization required time) with the reception environment information (“H”, “M”, “L”). Also, the synchronization level data 53 is classified into a plurality of stages (“H”, “M”, “L”) according to whether the synchronization environment time information is good or bad.

Under this premise, returning to the description of ST7, in ST7, the synchronization level selection program 34 of FIG. 5 operates, referring to the synchronization required time data 72 of FIG. 7, and corresponding to the time of this data of FIG. The synchronization level data 53 is selected.
For example, if the synchronization required time data 72 of FIG. 7 measured by the timer 29 in ST6 is 0.3 (s), the synchronization level selection program 34 selects “L” from the synchronization level data 53 of FIG. To do.
Thus, the synchronization level selection program 34 is an example of a reception environment information selection unit.

Next, proceeding to ST8, the display control program 33 of FIG. 5 is operated, and “L” which is the synchronization level data 53 selected in ST7 is displayed on the display 14.
Then, the user who has seen the display on the display 14 knows that the wristwatch 10 is in an environment where it is difficult to receive signals from the CDMA base station 15a and the like at the current position. Accordingly, the automatic reception operation of the pilot PN signal reception synchronization program 31 is stopped by operating the crown 28 in FIG. 2, so that useless consumption of the battery 27 can be prevented.
As described above, the display 14 (display unit) is configured to display the reception environment information (“L”) selected by the reception environment information selection unit (synchronization level selection program 34).

In ST9, the 64 frequency division counter 17c operates at the start timing input from the start timing generator 17b and starts frequency division.
That is, the 64 division counter 17c is operated by the 64 division counter control program 38 of FIG. 5, and for example, 1.2288 MHz, which is the pilot PN chip rate frequency data 55 of FIG. 6, is divided by 64, and FIG. ) Is generated.
This code has a code length of 64 chips, the first 32 chips are zero “0” signals, and the second 32 chips are “1” signals. Therefore, the Walsh code ( 32).

FIG. 14 is a schematic diagram illustrating a process in which the divide-by-64 counter 17c divides 1.2288 MHz, which is the pilot PN chip rate, to generate a walsh code (32).
As shown in FIG. 14, 1.2288 MHz, which is the chip rate of the pilot PN, is a digital “0” and “1” signal.
When such a signal, 1.2288 MHz, is divided by 64 by the frequency dividing counter 17c, as shown in FIG. 14, the first 32 chips are “0” and the second 32 chips are “1”. 32).

  In ST9, the walsh code 32 data mixing program 39 shown in FIG. First, the pilot channel signal, which is a signal received from the CDMA base station 15a or the like, is synchronized by mixing the pilot PN code, and the walsh generated by the divide-by-64 counter 17c at the synchronization timing that can be recognized from the head of the pilot PN code. Despread using code (32). Further, the sync channel message of FIG. 11 is received via the digital filter 17d, the deinterleave and decoding unit 17e, and the like.

  As shown in FIG. 11, the sync channel message includes a system time (such as SYS_TIME) that is future time information. For this reason, the signal transmitted from the CDMA base station 15a and the like is an example of a specific signal including future time information, and the future time information is transmitted via the walsh code (32) to the CDMA base station 15a and the like. It is the structure extracted from the signal transmitted from.

  Next, in ST10, the sync channel message reception end determination program 40 of FIG. 5 operates to determine whether or not the reception of the sync channel message is completed. When the reception of the sync channel message is not completed, In ST11, it is determined whether or not a timeout has occurred. If the timeout has occurred, the sync channel message is received again in ST9.

As described above, according to the present embodiment, the walsh code (32) necessary for extracting the sync channel message from the sync channel signal transmitted from the CDMA base station 15a or the like can be generated by the divide-by-64 counter 17c or the like. Therefore, it is not necessary to provide a walsh code generation device for generating 64 or more types of walsh codes as in the prior art.
For this reason, a circuit scale etc. can be made small and power consumption can be made small.

In the present embodiment, the basic frequency of 1.2288 MHz, which is the chip rate of the pilot PN, is simply divided by the divide-by-64 counter 17c, and the walsh code (32) as shown in FIGS. ) Can be generated, so that a very simple circuit configuration or the like can be obtained, and in particular, power consumption can be reduced.
Further, since the frequency division by the 64 frequency division counter 17c is performed based on the start timing signal of the start timing generator 17b based on the synchronization timing with the pilot PN signal, it is possible to reliably acquire the sync channel message from the sync channel signal. It has a configuration.

On the other hand, if it is determined in ST10 that the reception of the sync channel message is completed, the process proceeds to ST12. In ST12, the timer 29 starts counting. Specifically, the timer control program 32 in FIG. 5 operates to operate the timer 29. The data of the timer 29 is stored as the timer data 71 in FIG. In ST12, the system time (GPS time), leap second, local offset time, etc. of the sync channel message received in ST10 are calculated.
This calculation may be processed in the baseband unit 17 of FIG. 3 or may be processed by a calculation unit other than the baseband unit 17.
Specifically, based on the system time, the UTC time is calculated based on leap second data or the like, and based on this UTC time, for example, 9 hours is added as a local offset time to obtain Japan time or the like. In Japan, since daylight saving time is not used, daylight saving time is not substantially corrected. However, in countries such as the United States where daylight saving time is adopted, daylight saving time is corrected.

For example, when the wristwatch 10 receives the signal of the base station 15b in FIG. 10B, the time after four superframes after reception, that is, the time indicated by “FF” in FIG. 10B. The “basic local time” that is the time is calculated and registered as the basic local time data 73 of FIG. Specifically, the basic local time calculation program 41 of FIG. 5 operates.
The basic local time data 73 is a time that is four superframes (320 ms (milliseconds)) after the time point when the wristwatch 10 receives the data (time point “EE” in FIG. 10B).
The basic local time calculation program 41 is a time information acquisition unit.

A normal mobile phone device used in the CDMA system has a high processing capacity of a control device (CPU or the like), so that time information for time correction is acquired from the sync channel message if the time is 320 ms. I can.
However, since the wristwatch 10 according to the present embodiment is not a mobile phone or the like, the processing capability of the control device (CPU or the like) is lowered in view of the necessity of reducing the cost.
Therefore, even if the reception is completed at the time “EE” in FIG. 10B, the calculation of ST12 is not in time for 320 ms (milliseconds) thereafter.
In particular, in the case of the wristwatch 10, it is necessary to instantaneously calculate and execute a calendar, time calculation, reception interface, timing correction such as a fractional processing of 1 s (seconds) or less, which will be described later, and the processing capacity is low. The control device is difficult to execute.
Therefore, in the present embodiment, even in the case of a control device or the like having a low processing capability, the processes after ST13 in FIG. 9 are executed in order to enable the above-described time correction.

First, in ST13, 1.68 s (seconds) is added to the basic local time data 73 obtained in ST12, and time data after 2 s (seconds) from the reception is obtained as a whole.
This will be described with reference to FIG. 10. Since the basic local time data 73 obtained in ST12 is the time of “FF” (320 ms (milliseconds) after “EE”) in FIG. By adding “1.68 s (seconds)”, the data after 2 seconds as a whole (in FIG. 10B, “GG” time point) is obtained.
As a result, the wristwatch 10 secures a time of “2 s (seconds)” as the time for calculating and executing the above-described time correction, so even a wristwatch 10 having a control device with low processing capability can afford. It will be possible to adjust the time.

However, in the present embodiment, the following correction is performed in order to make the time indicated by “GG” in FIG.
First, if the time has a fraction of 1 s (seconds) or less at the time point “GG” in FIG. 10B described above, it is inconvenient when the wristwatch 10 is corrected. The final local time, which is a corrective time, is obtained and registered as final local time data 74 in FIG.
The data of “1.68 s (seconds)” is specifically registered as addition time data 56 in FIG. 6, and the final local time calculation program 42 in FIG. 5 executes with reference to this data. . In the present embodiment, the addition time data 56 is an example of time change information, but the addition time data 56 may be appropriately determined from the basic local time data 73 obtained in ST12.

In ST13, the time (last local time data 74) after 2 s (seconds) from reception (however, rounded down to the nearest 1 s (seconds)) has been clarified. It seems that it is sufficient to correct the time by referring to the timer data 71 and grasping after 2 seconds), but in reality, an error has occurred.
That is, at the time of “GG” in FIG. 10B, as shown in FIG. 10B, the signal from the base station 15b is delayed by the pilot PN offset, which is a time difference unique to the base station, compared to the system time. ing.
Further, the wristwatch 10 that has received the delayed signal of the base station 15b further adds the demodulation and decoding processing delay time which is the time in the deinterleave and decoding unit 17e shown in FIG. Will be further delayed.
That is, the reception data (data of the wristwatch 10) of the base station 15b in FIG. 10C is delayed by the amount of the pilot PN offset, demodulation, and decoding processing delay time compared to the system time ( “GGG” in FIG. 10).
Under such circumstances, the last local time data 74 obtained in ST13 is 2 seconds after the end of receiving the sync channel message of the base station 15 (b) (however, when the last local time data 74 is calculated, When the RTC 25 is corrected at the timing of subtracting the fraction when there is a fraction rounded down to 1 s (seconds), the result is as follows.
In other words, the time is corrected at the timing of “GGG” in FIG. 10C despite the time of the timing of “G” in FIG. 10A, and “G” and “GGG” in FIG. An error is generated by the difference between the two. (When there is no rounded down fraction)

Therefore, in ST14, a step of subtracting the pilot PN offset (0.052 ms × N) of the base station 15 b and the demodulation and decoding processing delay time (53 ms) of the wristwatch 10 from the above-described 2 s (seconds) is performed. Has been fixed.
Further, when there is a fraction rounded down when the final local time data 74 is calculated, the timing time is obtained by subtracting the fraction.
Specifically, the pilot PN offset (0.052 ms × N) is registered as pilot PN offset time data 57 in FIG. 6, and the demodulation and decoding processing delay time (53 ms) is the demodulation and decoding processing delay time in FIG. It is registered as data 58. Therefore, the timing time calculation program 43 in FIG. 5 refers to these data to obtain timing time data and registers it as the timing time data 75 in FIG.

Thus, the timing time data 75 obtained in ST14 is 2 seconds (however, when the final local time data 74 is calculated, if there is a fraction rounded down to 1 s (seconds), the fraction is subtracted), Data obtained by subtracting the pilot PN offset (0.052 ms × N) of the base station 15 b from the demodulation / decoding processing delay time (53 ms) of the wristwatch 10 to correct the error between “GGG” and “G” in FIG. 10. ing.
Therefore, if the RTC 25 is corrected at the time of the timing time data 75 with the base station 15 (b) as the reference when the reception of the sync channel message ends, the final local time data 74 at the timing of “G” in FIG. It is possible to correct the time at the time.
Therefore, in ST17, if the time of the RTC 25 is corrected to the final local time data 74 at the timing when the timer data 71 matches the timing time data 75, the time can be corrected very accurately.
As described above, the hands 13 and the like of FIG. 1 are also corrected based on the RTC 25 corrected with high accuracy, and the user of the wristwatch 10 can use the corrected time.

By the way, since this time correction is executed within a time of 2 s instead of a limited time of 320 ms, it is not necessary to mount a control device having a high processing capacity on the wristwatch 10.
It is also possible to correct the time based on time information with high accuracy of the CDMA system while reducing the production cost of the wristwatch 10.

In ST15, the RTC time correction program 44 of FIG. 5 is operated and executed, and the power of the CDMA base station radio wave receiver 24 is turned off.
The RTC time correction program 44 is an example of a reception side time information correction unit, and the basic local time data 73 is an example of correction time information generated based on future time information and time change information.

Next, the process proceeds to ST16 in FIG. In ST16, the timer 29 operates. That is, the time correction start determination program 45 of FIG. 5 operates and refers to the time correction interval data 59 of FIG. The time correction interval data 59 is, for example, 24 hours.
For this reason, in ST17, the next time adjustment is started after 24 hours have elapsed from the previous time adjustment, and the processes after ST1 are executed.
Therefore, since the synchronization operation by the pilot PN synchronization unit 17a of ST1 is periodically executed, it is possible to prevent the time accuracy from being deteriorated in advance as the interval of the synchronization operation becomes too long as in the prior art.

8 and 9, the leap second, local offset time, and summer time data are automatically corrected based on the sync channel message received from the CDMA base station 15a or the like. However, the present invention is not limited to this. The user of the wristwatch 10 may be set using the crown 28 of FIG.
In this case, in ST12 described above, the basic 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 the schematic which shows the main structures of the CDMA base station radio wave receiver 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. (A) is a schematic diagram showing a state in which the CDMA base station radio wave receiver is synchronized with the pilot channel signal, and (b) is a schematic diagram showing a relationship between the start timing and the operation of the divide-by-64 counter. . It is the schematic which shows the relationship of receiving power (dBm), such as a CDMA base station, and the average synchronizing time (s) of the pilot PN synchronizing part of a CDMA base station radio wave receiver. It is the schematic which shows the process in which a 64 division counter divides 1.2288 MHz which is a chip rate of pilot PN, and produces | generates a walsh code | symbol (32).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Wristwatch with time adjustment device, 11 .... Antenna, 12 ... Dial, 13 ... Hand, 14 ... Display, 15a and 15b ... CDMA base station, 16 ... High frequency reception 17, baseband unit, 17 a, pilot PN synchronization unit, 17 b, start timing generator, 17 c, 64 frequency division counter, 17 d, digital filter, 17 e, deinterleave and Decoding unit, 18 ... control unit, 24 ... CDMA base station radio receiver, 25 ... real time clock (RTC), 27 ... battery, 29 ... timer, 30 ... various programs Storage unit 31 ... Pilot PN signal reception synchronization program, 32 ... Timer control program, 33 ... Display control program, 34 ... Period level selection program, 37 ... start timing generator control program, 38 ... 64 frequency division counter control program, 39 ... Walsh code 32 data mixing program, 40 ... sync channel message reception end judgment program, etc. 41 ... basic local time calculation program, 42 ... final local time calculation program, 43 ... timing time calculation program, 44 ... RTC time correction program, 45 ... time correction start determination program, First data storage unit 51 ... Pilot PN synchronization data, 53 ... Synchronization level data, 54 ... Service area data, 55 ... Pilot PN chip rate frequency data, 56 ... -Addition time data, 57 ... Pilot P Offset time data, 58... Demodulation, decoding processing delay time data, 59... Time correction interval data, 70... Second various data storage unit, 71. Time data 73 ... Basic local time data, 74 ... Last local time data, 75 ... Timing time data

Claims (6)

A receiving unit for receiving a specific signal including the transmission side time information transmitted by the base station;
A time information management unit for managing time information on the receiving side;
Generating correction time information for correcting the reception side time information based on the transmission side time information
A correction time information generation unit;
A receiving side time information correction unit for correcting the receiving side time information based on the correction time information,
The receiving unit has a signal synchronization unit that performs a synchronization operation to synchronize with the specific signal,
A synchronous operation time information acquisition unit for acquiring synchronous operation time information which is time information for the signal synchronization unit to perform a synchronous operation;
A synchronization-related reception environment information storage unit that stores synchronization-related reception environment information that associates the synchronization operation time information with the reception environment information of the specific signal;
A reception environment information selection unit that selects the reception environment information based on the synchronous operation time information;
A display unit for displaying the reception environment information selected by the reception environment information selection unit;
An external reception control unit that controls reception of the specific signal of the reception unit.   The time correction apparatus according to claim 1, wherein the quality of the reception environment information is divided into a plurality of stages according to the length of the synchronous operation time information.   The time correction apparatus according to claim 1, wherein the signal synchronization unit is configured to display on the display unit and notify a user that the synchronization operation has failed. The specific signal includes future time information after a lapse of a certain time transmitted by the base station,
The time correction device according to any one of claims 1 to 3, wherein the correction time information is generated based on the future time information and time change information for changing the future time information. . A receiving unit for receiving a specific signal including the transmission side time information transmitted by the base station;
A time information management unit for managing time information on the receiving side;
A correction time information generation unit for generating correction time information for correcting the reception side time information based on the transmission side time information;
A receiving side time information correction unit for correcting the receiving side time information based on the correction time information,
The receiving unit has a signal synchronization unit that performs a synchronization operation to synchronize with the specific signal,
A synchronous operation time information acquisition unit for acquiring synchronous operation time information which is time information for the signal synchronization unit to perform a synchronous operation;
A synchronization-related reception environment information storage unit that stores synchronization-related reception environment information that associates the synchronization operation time information with the reception environment information of the specific signal;
A reception environment information selection unit that selects the reception environment information based on the synchronous operation time information;
A display unit for displaying the reception environment information selected by the reception environment information selection unit;
An external reception control unit that controls reception of the specific signal of the reception unit. A receiving unit for receiving a specific signal including the transmission side time information transmitted by the base station;
An external reception control unit that controls reception of the specific signal of the reception unit;
A time information management unit for managing time information on the receiving side;
A correction time information generation unit for generating correction time information for correcting the reception side time information based on the transmission side time information;
A receiving side time information correction unit for correcting the receiving side time information based on the correction time information,
The receiving unit has a signal synchronization unit that performs a synchronization operation to synchronize with the specific signal,
A synchronous operation time information acquisition unit for acquiring synchronous operation time information which is time information for the signal synchronization unit to perform a synchronous operation;
A synchronization-related reception environment information storage unit that stores synchronization-related reception environment information that associates the synchronization operation time information with the reception environment information of the specific signal;
The reception environment information selection unit selects the reception environment information based on the synchronous operation time information,
A time correction method, wherein the reception environment information selected by the reception environment information selection unit is displayed on a display unit.

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