JPH1026676A - Automatic time correction method, terminal device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To automatically correct the internal time of a terminal device wirelessly or wiredly connected to a center device. SOLUTION: Time data is periodically transmitted from a center device, and when receiving the time data, a terminal device stores the time data in a reception time storage area 18 of a memory 16 as a reception time. The central processing unit 12 counts up the reception time and the terminal time in the terminal time storage area 17 indicating the internal time by using the clock from the clock generator 13, and
The two are periodically compared, and if they do not match, the terminal time is made to match the reception time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic time correction method for automatically correcting the internal time of a terminal device and an apparatus provided with the method.

[0002]

2. Description of the Related Art Many terminal devices of digital wired systems and wireless systems are provided with internal timers, and central processing is performed when the time (year, month, day, hour, minute, second, etc.) is required. It is taken into the device (CPU), displayed on the display means, and used as time data used in a program being executed by the CPU. This internal timer continues to operate even if the power switch of the terminal device is turned off, when the power supply is connected to the terminal device or a charged battery is set.

[0003]

The internal timer of the conventional terminal device described above operates when the power cord of the terminal device is disconnected, or when the battery is taken out or the battery is left out of battery. Stop and the time goes wrong. Even in the case of a terminal device provided with a backup battery for a timer, the time will be incorrect after the backup available time has passed. In such a case, it is necessary to correct the time by manually operating switches, keys, and the like of the terminal device.

An object of the present invention is to provide an automatic time correction method capable of automatically correcting the time of an internal timer of a terminal device and a terminal device provided with the method.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an automatic time correction device for automatically correcting the internal time of a terminal device connected to a center device via a wireless transmission line or a wired transmission line. A time correction method, wherein time data is periodically transmitted from the center device, and each terminal device corrects the internal time of its own device with reference to the transmitted time data. To provide an automatic time correction method.

Further, according to the present invention, the terminal device stores the transmitted time data as a reception time in a built-in memory, and counts up the stored reception time by a clock of a timer in the terminal device. Each time the time indicated by the timer reaches a predetermined time, the time indicated by the timer is compared with the reception time, and when they do not match, the time indicated by the timer matches the reception time. There is provided an automatic time correction method characterized in that the time is corrected.

Further, according to the present invention, there is provided an internal timer, time data receiving means for receiving time data periodically transmitted from the center device, and storing the received time data in a built-in memory as a reception time, and the time data received and stored by the means. A reception time updating unit that counts up and updates the reception time with the clock of the internal timer, and is updated by the reception time updating unit when the time of the internal timer becomes a correction time periodically determined in advance. Comparison means for comparing the received time with the time of the internal timer, and correction means for correcting the time of the internal timer to be the reception time when the comparison result by the means indicates a mismatch, A terminal device provided with:

[0008]

Embodiments of the present invention will be described below. 3 and 4 are explanatory diagrams of a wireless system and a wired system. In the wireless system of FIG. 3, a base station 31 and wireless terminal devices 32, 32,... Are connected via a wireless transmission path 33. . On the other hand, in the wired system of FIG. 4, a center device 41 and wired terminal devices 42, 42,... Are connected via a wired transmission line 43.

FIG. 1 is a block diagram showing a configuration example of a terminal device equipped with an automatic time correction method according to the present invention. The data receiving device 11, the central processing unit 12, the clock generator 13,
A display device 14, an input device 15, and a memory 16 are provided. The data receiving device 11 includes a wireless (transmitting) receiver and a demodulator for a wireless terminal device, and a wired (transmitting) receiver and a demodulator for a wired terminal device.

In the above configuration, the central processing unit 12
The data received by the data receiving device 31 is stored in the memory 1
6, and simultaneously displayed on the display device 14. When the user wants to view necessary data, a command or the like is input from the input device 15 and the central processing unit 12 takes in the command, determines what to display, and searches the memory 16 for necessary data. To display.

The internal timer is constituted by counting the clock signal from the clock generator 13 by the central processing unit 12, and the time measured by the timer is stored in the terminal time storage area 17 in the memory 16. The time of the internal timer used in the terminal device is the time stored in this area 17. As described in the related art, since the time of such an internal timer becomes inconsistent due to power interruption or the like, it is necessary to correct the time.
The method will be described below.

FIG. 2 is a flowchart showing an example of the automatic time correction method of the present invention, which is executed by the central processing unit. In this automatic correction method, in the case of a wireless system, FIG.
In the case of a wired system, time data indicating the time is transmitted from the base station for a fixed time, for example, every minute, from the center in FIG. Upon receiving data from the base station or the center (step 201), the terminal device checks whether or not the data is time data (step 202). In digital data transmission, since each data is provided with a header, the determination in step 202 can be easily performed by adding information for identifying time data to the header information. If it is determined that the data is not time data, the data is displayed and stored in the memory (step 203). On the other hand, if the received data is time data, the time data is stored as the reception time in the reception time storage area 18 of the memory 16 (step 204). The stored reception time is counted up by the central processing unit 12 using the clock from the clock generator 13 similarly to the time of the internal timer stored in the area 17, that is, the terminal time.

Next, it is checked whether it is time correction time (step 205). This time correction time is predetermined in the terminal device, and is, for example, a time of 00 seconds per minute. Then, it is the above step 205 to check whether the terminal time has reached the time correction time. As a result, when the time is the time correction time, the terminal time in the memory 16 is compared with the reception time (step 206). When the terminal time and the reception time match, the terminal time is not corrected. If the reception times are different, the terminal time is corrected to be the same as the reception time, and the terminal time is displayed on the display device (step 207).

When the above-described automatic time correction method is applied to, for example, a pager system, the time can be automatically corrected for all pager terminals in the service area if the power is turned on, and each user can perform the correction operation. It is possible to display the correct time without performing the operation.

[0015]

According to the present invention, it is possible to automatically correct the times of all internal timers of a terminal device of a wireless system or a wired system, thereby providing an advantageous system.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration example of a terminal device provided with an automatic time correction method of the present invention.

FIG. 2 is a flowchart showing an example of processing for automatic time correction in the apparatus shown in FIG. 1;

FIG. 3 is an explanatory diagram of a wireless system.

FIG. 4 is an explanatory diagram of a wired system.

[Explanation of symbols]

 Reference Signs List 11 data receiving device 12 central processing unit 13 clock generator 14 display device 15 input device 16 memory 17 terminal time storage area 18 reception time storage area

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shinji Saijo 3--14-20 Higashinakano, Nakano-ku, Tokyo Inside Kokusai Electric Corporation

Claims (3)

[Claims] 1. An automatic time correction method for automatically correcting the internal time of a terminal device connected to a center device via a wireless transmission path or a wired transmission path, wherein time data is periodically transmitted from the center apparatus. An automatic time correction method, wherein each terminal device corrects the internal time of the terminal device by referring to the transmitted time data. 2. The terminal device stores the transmitted time data in a built-in memory as a reception time, counts up the stored reception time with a clock of a timer in the terminal device, and indicates the time indicated by the timer. Each time the time reaches a predetermined time, the time indicated by the timer is compared with the reception time, and when they do not match, the time indicated by the timer is corrected to match the reception time. The automatic time correction method according to claim 1, wherein 3. An internal timer, time data receiving means for receiving time data periodically transmitted from the center device, and storing the received time data in a built-in memory as a reception time, and receiving the reception time received and stored by the means. Receiving time updating means for counting up and updating with a clock of the internal timer; and receiving time updated by the receiving time updating means when the time of the internal timer becomes a correction time periodically determined in advance. Comparing means for comparing a time with the time of the internal timer, and correcting means for correcting the time of the internal timer to be the reception time when the comparison result by the means indicates a disagreement. A terminal device characterized by the above-mentioned.