US 12,332,607 B2
Semiconductor IC, electronic device, and time display method
Hideo Sasahara, Suwa (JP); and Eiji Kinoshita, Matsumoto (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Oct. 28, 2020, as Appl. No. 17/082,486.
Claims priority of application No. 2019-197244 (JP), filed on Oct. 30, 2019.
Prior Publication US 2021/0132551 A1, May 6, 2021
Int. Cl. G04G 21/04 (2013.01); G01S 19/29 (2010.01); G04G 9/00 (2006.01)
CPC G04G 21/04 (2013.01) [G01S 19/29 (2013.01); G04G 9/00 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A semiconductor IC, comprising:
a calculator configured to calculate a position by Doppler positioning using a radio wave transmitted from a satellite;
a verifying portion configured to:
calculate an index value based on a position of the satellite and the position calculated by the Doppler positioning;
determine the index value is one of:
equal to or less than a predetermined threshold value, or
larger than the predetermined threshold value;
determine, based on the determination that the index value is larger than the predetermined threshold value, an accuracy of the position calculated by the Doppler positioning deviates from a time zone; and
determine, based on the determination that the index value is equal to or less than the predetermined threshold value, the accuracy of the position calculated by the Doppler positioning does not deviate from the time zone;
a specifying portion configured to specify the time zone based on the determination that the accuracy of the position calculated by the Doppler positioning does not deviate from the time zone; and
a display controller configured to:
display, based on the determination that the index value is equal to or less than the predetermined threshold value, a time according to the specified time zone on a display device; and
display, based on the determination that the index value is larger than the predetermined threshold value, a message indicating that the accuracy of the position calculated by the Doppler positioning deviates from the time zone.