Electronic timepiece and control method of electronic timepiece
AssigneeSeiko Epson Corporation
InventorKazumi Matsumoto
Life of this patent
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Abstract
A processor controls an oscillation circuit such that a frequency of a clock signal is close to a reference frequency based on a frequency of a carrier wave of a standard radio wave and the frequency of the clock signal. In this manner, since the processor controls the frequency of the clock signal by using the carrier wave of the standard radio wave of which the frequency is managed with high accuracy, it becomes possible to improve accuracy of an internal time.
Claims17
An electronic timepiece comprising:
- a receiver configured to receive a standard radio wave on a carrier wave;
- an oscillation circuit configured to generate a clock signal with a frequency and used for measuring an internal time;
- and
- a processor configured to specify phase differences between the clock signal and a reference wave with a reference frequency, the reference frequency based on a frequency of the carrier wave, and to control the oscillation circuit based on the phase differences such that the frequency of the clock signal is close to the reference frequency.
A control method of an electronic timepiece including a receiver configured to receive a standard radio wave on a carrier wave, and an oscillation circuit configured to generate a clock signal with a frequency used for measuring an internal time, the method comprising:
- causing the electronic timepiece to specify phase differences between the clock signal and a reference wave with a reference frequency, the reference frequency based on a frequency of the carrier wave;
- and
- causing the electronic timepiece to control the oscillation circuit based on the phase differences such that the frequency of the clock signal is close to the reference frequency.
An electronic timepiece comprising:
- a receiver configured to receive a standard radio wave on a carrier wave;
- an oscillation circuit configured to generate a clock signal with a frequency and for measuring an internal time;
- and
- a processor configured to specify phase differences between the clock signal and a reference wave with a reference frequency, the reference frequency based on a frequency of the carrier wave, and to control the oscillation circuit based on the phase differences to reduce a difference between the frequency of the clock signal and the reference frequency.
Dependencies are inferred from the claim text.