Title:
METHOD FOR ADJUSTING MEAN FREQUENCY OF TIME BASE INCORPORATED IN ELECTRONIC WATCH
Document Type and Number:
Japanese Patent JP2020046428
Kind Code:
A
Abstract:
To provide a technically simple and thus inexpensive solution for adjusting a mean operating frequency of electronic watches, and more specifically, compute an inhibition value associated with each electronic watch.SOLUTION: There is provided a method for determining a constant parameter of an inhibition value for adjusting a mean operating frequency of a watch equipped with a quartz oscillator. The method is implemented with a self-calibration circuit of an electronic watch device. The method comprises: from a first external pulse and a second external pulse received from a system external to the watch and separated by a measurement time, corresponding to a reference number of reference periods for a periodic calibration signal (Scal) derived from the time-measurement signal (Sosc) and having a calibration frequency derived from the natural frequency of the quartz oscillator, determining a calibration parameter representative of a ratio between a calibration period and a reference period for the periodic calibration signal; and determining a constant inhibition parameter as a function of the calibration parameter.SELECTED DRAWING: Figure 2
Inventors:
FRANCOIS KLOPFENSTEIN
XAVIER STEHLIN
XAVIER STEHLIN
Application Number:
JP2019168054A
Publication Date:
March 26, 2020
Filing Date:
September 17, 2019
Export Citation:
Assignee:
ETA SA MFT HORLOGERE SUISSE
International Classes:
G04G3/02; G04D7/00
Attorney, Agent or Firm:
Shigeki Yamakawa
Masaki Yamakawa
Masaki Yamakawa