Radio-controlled timepiece and control method for a radio-controlled timepiece

A technology of radio waves and clocks, applied in clocks, radio-controlled timers, electromechanical clocks, etc., can solve the problems of deterioration of the receiving environment, inability to obtain time information, and increased power consumption, and achieve the effect of optimizing the binarization conditions.

Inactive Publication Date: 2009-01-14
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in this method, it takes at least several minutes until it can be judged whether the correct time information is obtained
Therefore, for example, it takes time until it is judged that the receiving environment has deteriorated and correct time information cannot be obtained, and accordingly there is a problem of increased power consumption.

Method used

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  • Radio-controlled timepiece and control method for a radio-controlled timepiece
  • Radio-controlled timepiece and control method for a radio-controlled timepiece
  • Radio-controlled timepiece and control method for a radio-controlled timepiece

Examples

Experimental program
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no. 1 Embodiment approach

[0075] Next, a radio-controlled timepiece 1 according to a first embodiment of the present invention will be described with reference to the drawings.

[0076] figure 1 It is a block diagram showing the configuration of the radio-controlled timepiece of the first embodiment.

[0077] FIG. 2 is a circuit diagram showing configurations of a binarization circuit and a VREF switching circuit.

[0078] image 3 It is a graph showing the reception pulse duty ratio and amplitude change of each signal with respect to the Japanese standard radio wave "JJY".

[0079] Figure 4 It is a graph showing the reception pulse duty ratio and amplitude change of each signal with respect to the standard radio wave "WWVB" in the United States.

[0080] Figure 5 It is a graph showing the reception pulse duty ratio and amplitude change of each signal with respect to the German standard radio wave "DCF77".

[0081] Image 6 It is a graph showing the reception pulse duty ratio and amplitude cha...

no. 2 Embodiment approach

[0184] Next, a radio-controlled timepiece 1A according to a second embodiment of the present invention will be described with reference to the drawings.

[0185] Figure 13 It is a block diagram showing the structure of the radio-controlled timepiece of the second embodiment.

[0186] FIG. 14 is a graph showing the relationship between the AGC voltage and the gain in the first amplifier circuit.

[0187] 15 is a graph showing the relationship of the AGC voltage with respect to the input level of the received signal in each AGC characteristic switched by the AGC circuit.

[0188] In addition, when describing the radio-controlled timepiece 1A of the second embodiment, the same structures as those of the radio-controlled timepiece 1 of the above-mentioned first embodiment are assigned the same reference numerals, and their descriptions are simplified or omitted.

[0189] (1) Structure of radio-controlled timepiece 1A

[0190] exist Figure 13 Among them, the radio-controlled ...

no. 3 Embodiment approach

[0227] Next, a radio-controlled timepiece 1B according to a third embodiment of the present invention will be described with reference to the drawings.

[0228] Figure 18 It is a block diagram showing the structure of the radio-controlled timepiece 1B of the third embodiment. In the description of the radio-controlled timepiece 1B of the third embodiment, the same reference numerals are assigned to the same configurations as those of the radio-controlled timepieces 1 and 1A of the first and second embodiments described above, and their descriptions are simplified or omitted.

[0229] (1) Configuration of the radio-controlled timepiece 1B of the third embodiment

[0230] The radio-controlled timepiece 1B of the third embodiment is a timepiece in which the TC generator 44 of the radio-controlled timepiece 1 of the first embodiment is modified.

[0231] That is, the TC generating unit 44A in the radio-controlled timepiece 1B functions as the internal time reliability judging m...

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Abstract

A radio-controlled timepiece that receives a standard time signal containing a time code and adjusts the time based on the received standard time signal includes: a reception means that receives the standard time signal; an analog / digital conversion means that digitizes the received standard time signal based on a prescribed threshold value; a time counter that keeps time; a time code generating means that generates a reference time code based on the time counted by the time counter; a duty evaluation means that calculates the pulse duty cycle of the digital signal output from the A / D conversion means, and determines if the received pulse duty cycle that is calculated matches the duty cycle of the reference time code generated by the time code generating means; a level changing means that changes the relative level of the threshold value to the reception signal if the duty evaluation means determines that the received pulse duty cycle does not match the duty cycle of the reference time code; and a time code decoding means that decodes the digital signal and demodulates the time code if the duty evaluation means determines that the received pulse duty cycle matches the duty cycle of the reference time code.

Description

technical field [0001] The present invention relates to a radio wave corrected timepiece and its control method which receives a standard radio wave with time information and corrects the time according to the received standard radio wave. Background technique [0002] Conventionally, radio-controlled timepieces capable of receiving standard radio waves are known (for example, refer to Patent Documents 1 and 2). [0003] The standard radio wave is amplitude modulated, and the radio-controlled timepiece has a binarization circuit in the receiving circuit. The binarization circuit uses a filter or the like to extract the envelope of the received signal, and then compares the envelope signal with a comparator or the like. and reference voltage and perform binarization. Then, the radio-controlled timepiece acquires time information based on the time code signal obtained by the binarization circuit, and displays the time. [0004] Furthermore, these radio-controlled timepieces ...

Claims

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Application Information

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IPC IPC(8): G04G5/00G04G7/02G04R20/00G04R20/10G04R20/12
Inventor 藤沢照彦
Owner SEIKO EPSON CORP
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