Time is appropriately corrected without needlessly consuming power. In step S101 and step S102, a CPU of an electronic timepiece determines whether to correct a time measured by a timekeeping circuit. Then, when a determination is made to correct the time measured by the timekeeping circuit, in step S111 and step S112, the time measured by the timekeeping circuit is corrected on the basis of time information held by a wireless device.

Provided is a radio-controlled timepiece that can reduce overall power consumption. The radio-controlled timepiece 1 has a receiver circuit 12 that executes during a specific time limit a reception process to acquire multiple time data from the standard time signals at different times; storage 22 that stores multiple time data; a timekeeper 23 that keeps an internal time; a time setting adjuster 24 that corrects the internal time based on coherent time data when the number of coherent time data, which is time data that is mutually coherent, in the multiple time data reaches a threshold; and a reception controller 21 that extends the time limit when the number of coherent time data is less than the threshold when a specific time that is shorter than the time limit has past since the reception process started.

An electronic device and time piece are shown. The electronic device includes: a plurality of antenna devices; a plurality of motors; and antimagnetic plates, each fully or partially covering the motors and having cutouts at positions overlapping with the antenna devices.

An electronic device and time piece are shown. The electronic device includes: a plurality of antenna devices; a plurality of motors; and antimagnetic plates, each fully or partially covering the motors and having cutouts at positions overlapping with the antenna devices.

To synchronize, in a system in which a plurality of devices perform measurement, measurement timings with each other with a simple configuration. A sensing system includes a plurality of sensor devices. The sensor devices each include a trigger sensor and a target sensor. In the sensor device, the trigger sensor measures a signal value of a trigger signal. Also, in the sensor device, the target sensor starts to measure a physical quantity when the signal value measured by the trigger sensor satisfies a predetermined condition.

An electronic timepiece includes a counter, a near field communication unit, a standard electric wave receiving unit and a control unit. The counter is configured to count current time. The near field communication unit is configured to communicate with a terminal by near field communication electric waves and to receive first time information. The standard electric wave receiving unit is configured to receive standard electric waves and to acquire second time information. The control unit changes current time counted by the counter, based on the first or second time information.

A processor outputs selected frequency information from standard radio wave frequency information, GPS frequency information, LPWA frequency information, and mobile phone frequency information, and controls an oscillation circuit such that a frequency of a clock signal is close to a reference frequency. Accordingly, even in a case where an environment of an electronic device changes, it is possible to improve accuracy of an internal time by correcting a frequency of the clock signal by using a radio wave appropriate for the environment after the change.

A processor outputs selected frequency information from standard radio wave frequency information, GPS frequency information, LPWA frequency information, and mobile phone frequency information, and controls an oscillation circuit such that a frequency of a clock signal is close to a reference frequency. Accordingly, even in a case where an environment of an electronic device changes, it is possible to improve accuracy of an internal time by correcting a frequency of the clock signal by using a radio wave appropriate for the environment after the change.

A reference time generator including a first clock source including a reference synthesizer and cesium atomic clock configured to produce a cesium reference signal and a cesium QOT metric, a second clock source including a reference synthesizer and rubidium atomic clock configured to produce a rubidium reference signal and a rubidium QOT metric, and a circuit for selecting from the clock sources one reference signal based on the best QOT metric.

A reference time generator including a first clock source including a reference synthesizer and cesium atomic clock configured to produce a cesium reference signal and a cesium QOT metric, a second clock source including a reference synthesizer and rubidium atomic clock configured to produce a rubidium reference signal and a rubidium QOT metric, and a circuit for selecting from the clock sources one reference signal based on the best QOT metric.