JPH0727882A - Automatic time adjustment device - Google Patents

Abstract

PURPOSE:To provide an automatic time adjustment device which does not require any troublesome adjustment during production and automatically adjusts the time when it is used. CONSTITUTION:A clock generation circuit 131 for time piece, a main clock generation circuit 132 generating clock pulse with a higher frequency than that of the colck generation circuit for time piece, a system control microcomputer 13 for measuring the error of the clock for time piece from an external clock for adjusting the time piece, calculating the present time based on the elapsed time from a predetermined time and the error and correcting the time, and E<2>PROM 24 storing the error, are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic time adjustment device for a timepiece or the like.

[0002]

2. Description of the Related Art In a conventional VTR having a clock function, when the time is measured based on the transmission clock in the system, the accuracy of the transmission clock becomes the accuracy of the clock function as it is. The clock error was adjusted using.

[0003]

Therefore, it is necessary to match the frequencies in order to improve the timepiece accuracy, and an adjustment process must be included in the manufacturing process, which increases the manufacturing cost.
It was a factor of cost increase. The present invention has been made in view of these problems, and an object thereof is to provide an automatic time adjustment device that does not require any complicated adjustment at the time of manufacturing and automatically adjusts the time at the time of use.

[0004]

In order to achieve the above object, an automatic time adjusting device according to a first aspect of the present invention has a timepiece reference clock pulse generating means and a frequency higher than that of the timepiece reference clock pulse generating means. Main clock pulse generating means for generating a clock pulse, error calculating means for measuring an error between an external reference clock pulse and a clock reference clock pulse by the clock pulse from the main clock pulse generating means, and the above-mentioned error are stored. Error storage means, and time adjustment means for calculating the current time based on the time elapsed from a predetermined reference time and the above error and adjusting the time.

A time automatic adjustment device according to a second aspect of the present invention is the same as the time automatic adjustment device according to the first aspect of the invention.
A reference time storage means for storing the corrected time as a predetermined reference time is provided. Further, the time automatic adjustment device according to the third invention is configured such that the time adjustment in the time automatic adjustment device according to the first or second invention is performed by a predetermined operation.

[0006]

According to the time automatic adjustment device of the present invention, the error calculating means measures the error between the external reference clock pulse and the clock reference clock pulse by the clock pulse from the main clock pulse generating means, The error storage means stores the error. And the time adjustment means
The current time is calculated based on the elapsed time from a predetermined reference time and the above error, and the time is corrected.

Further, when the reference time storage means is provided, the corrected time is stored as a predetermined reference time. Furthermore, in a predetermined case, the time is adjusted by a predetermined operation.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an example of an information reproducing apparatus having an automatic time adjustment device according to the present invention.
It is an application example to R. In this device, at the time of recording,
The video signal input from the input terminal 6 is subjected to predetermined processing by a known circuit such as the video signal input circuit 5 and the recording signal processing circuit 4, and the magnetic tape is passed through the terminal 3a of the switch 3 and the magnetic head 2. It is recorded in 1.

At the time of reproduction, the reproduction signal read from the magnetic tape 1 via the magnetic head 2 passes through the terminal 3b of the switch 3 and the reproduction signal processing circuit 7 and the reproduction signal detection circuit 1
Sent to 1. The reproduction signal subjected to the predetermined reproduction processing in the reproduction signal processing circuit 7 is mixed with the character signal generated from the character signal generation circuit 12 in the mixing circuit 8 and output to the output terminal 10 via the video signal output circuit 9. It is transmitted as a video signal.

The reproduction signal detection circuit 11 outputs a signal for discriminating a recorded portion and an unrecorded portion of the video signal, and sends the detected signal to the system control circuit 13. The operation unit 18 is used to instruct various operations such as reproduction, fast-forward, and rewind by operation, and outputs operation signals to the system controller.
To the circuit 13. System control circuit 13
Is supplied with power from a battery 22 via a power supply voltage interface circuit 21, and is supplied with a backup power supply 20 for operating an internal clock, as well as with E ² PRO.
Various adjustment data stored in M19 is supplied.

The system control circuit 13 is a capstan motor drive circuit 1 based on the detected FG signal.
Drive the capstan motor 15 via 4,
Cylinder motor drive circuit 16 based on FG and PG signals
Cylinder motor 17 is driven via. FIG. 2 shows a processing procedure of the system control circuit 13 in FIG.

After the reset start and after the initial setting process (step S1), the adjustment mode in the manufacturing process is set.
It is determined whether or not it is the mode (step S2). If it is the adjustment mode, the adjustment process is performed (step S3), and the process returns to the step S2. If it is not the adjustment mode, the OSD (On Screen Driver) for displaying characters on the monitor.
After performing the automatic adjustment process (step S4), the normal main program is started (step S5).

First, it is determined whether or not the power is off (step S6). If not, the OSD display processing (step S7) and the clock display processing when the power is on (step S).
8), operation key input processing (step S9), various sensor input processing (step S10), and mode change processing (step S11) such as reproduction, fast forward, rewind, etc., and then a predetermined time count. After the lapse of time, the main processing such as external input is awaited to be completed (step S12), and when the processing is completed, the processing returns to step S6.

In step S6, if the power is off, the power off process (step S13) and the power OF are performed.
After the clock processing at F o'clock is executed (step S14), the process returns to step S6. Next, the automatic adjustment of the clock error will be described in detail. The automatic time adjustment device of this embodiment is
At the time of manufacture, a clock clock, which is a reference clock pulse, is input from the outside, the error with the internal clock clock is measured, stored in a memory such as E ² PROM in the product, and based on this error, Accurate time can always be displayed by matching the time difference due to the error from the time clock setting from the time of setting the time signal to the time of use.

FIG. 3 is a diagram for explaining the operation thereof. As shown in FIG. 3A, at the time of manufacture, the period t11 of the clock adjusting clock is clocked by the main clock coefficient of the microcomputer, and similarly, inside the microcomputer. Period t12 of the interrupt clock (divided clock of the clock clock) by the clock for clock
And the error α is obtained by α = (t12-t11) / t11.

Further, at the time of normal use, as shown in FIG. 2B, time data at the time of use: year B month C day D hour E minute F
Second, after the unused period, time data at the time of next use: G year H
If the difference from the month I day J hour K minute L seconds is X, the time difference due to the error is αX, so the new clock data is G year H month I day J hour K minute L second + αX = G ′ year H'month I'day J'hour K'minute L'second.

FIG. 4 is a block diagram of the essential parts of this embodiment. The system control circuit (microcomputer) 13 includes:
As the reference clock pulse generating means for a clock, for example, 38
A timepiece clock generating circuit 131 of KH _Z, as a main clock generator, the main clock generation circuit 132 having MH _Z ~ ten MH _Z is provided, for example, above as resulting error de - data such as an error memory E ² PRO as a means
It is stored in M24.

FIG. 5 shows a processing procedure of the above-described operation at the time of manufacturing. First, waiting for the rise of the adjustment signal (step S9).
1), the time data t11 is reset to 0 (step S9).
2) Wait for the next rise of the adjustment signal (step S9)
3), the time data t11 is measured and confirmed (step S9).
4) Then, wait for the internal clock interrupt (step S
95) and resets the clock data t12 to 0 (step S
96), waiting for the next interrupt of the internal clock (step S
97), the time data t12 is measured and determined (step S).
98) Next, using the obtained time data t11 and t12, the error α is obtained by α = (t12-t11) / t11 (step S99), and the obtained error α is stored in the E ² PROM. Writing (step S100), and ends the process. These processes are performed by the system control circuit 13 which constitutes an error calculating means.

Next, referring to FIG. 6, when the power is turned on and when the power is turned on.
A clock processing operation procedure at the time of FF will be described. These processes also constitute the system control 1 which constitutes the time adjustment means.
Made by 3. First, the clock processing when the power is turned on is shown in FIG.
As shown in (A), it is determined whether or not the power supply is turned from ON to OFF (step S101), and when it is turned ON, that is, when a predetermined operation is performed, the current time is called and set as TN. (Step S102). Then E
² Call error α from PROM (step S10
3) The time when the power was last turned on, which is a predetermined reference time, is called TB (step S104). Then, the time difference ΔT from the previous time, that is, the elapsed time is TN-
Obtained by TB (step S105), the correction time Tα is Tα
= Α · ΔT (step S106), the current time is corrected with TN-Tα as the current time (step S10).
7), and set as the new current time (step S108).
Next, for the correction processing at the time of turning on the power next time, the new current time is set as the previous data (step S109), that is, stored in the microcomputer as the reference time storage means, and then whether the clock reference time has elapsed It is determined whether or not (step S110). If the time has not elapsed, the process ends. If the time has elapsed, the clock count-up process is executed (step S111), and the process ends.

In the clock processing when the power is turned off, as shown in FIG. 6 (B), it is determined whether the clock reference time has elapsed (step S
121), if the time has elapsed, the clock count-up process is executed (step S122). If the time has not elapsed, the process ends. According to this embodiment, the adjustment capacitor is conventionally adjusted as a manufacturing process at the time of manufacturing, but the adjustment data can be taken in only by inputting the reference signal, so that the working efficiency is improved and the adjustment is performed. Since the use capacitor is not necessary, the cost can be reduced, and the influence of the change over time of the adjusting capacitor is also eliminated.

[0021]

According to the present invention, the time is automatically adjusted at the time of use without any troublesome adjustment at the time of manufacturing, so that the time and labor for adjusting the time can be saved.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an example of an information reproducing apparatus having an automatic time adjustment apparatus according to the present invention.

FIG. 2 is a diagram showing a processing procedure of a system control circuit 13 in FIG.

FIG. 3 is a diagram for explaining an example of automatic adjustment of a clock error according to the present invention.

4 is a configuration diagram of main parts of the example shown in FIG.

FIG. 5 is a diagram showing a processing procedure at the time of manufacturing the above operation.

FIG. 6 is a diagram showing a clock processing operation procedure at power-on and power-off.

[Explanation of symbols]

13 system control circuit 18 operation unit 19, 24 E ² PROM 20 backup battery 131 clock generation circuit for clock 132 main clock generation circuit.

Claims (3)

[Claims] 1. A clock reference clock pulse generating means, a main clock pulse generating means for generating a clock pulse having a frequency higher than that of the clock reference clock pulse generating means, and a clock pulse from the main clock pulse generating means. Error calculating means for measuring an error between the reference clock pulse from the reference clock pulse and the clock reference clock pulse, an error storing means for storing the error, a time elapsed from a predetermined reference time and the current time based on the error. An automatic time adjustment device comprising: a time adjustment unit that calculates the time and adjusts the time. 2. An automatic time adjustment device according to claim 1, further comprising a reference time storage means for storing the corrected time as a predetermined time serving as a reference. 3. The automatic time adjustment device according to claim 1, wherein the time adjustment is performed by a predetermined operation.