Clock or watch having accuracy-improving function
US6312153A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 3, 1999 |
| Grant date | Nov 6, 2001 |
| Priority date | — |
| Expiry date | Dec 3, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04G5/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A register having a predetermined set value is provided in parallel with a counter for counting a basic signal generated from a crystal oscillator. The register and the counter are connected to a comparator for inputting a count signal into a time-counting circuit every time when the count value of the basic signal in the counter has reached the set value in the register. A signal based on the time-counting signal is sent from the time-counting circuit to a display which indicates time based on the signal. The time indicated on the display is compared with the standard time indicated by a television or the like. In this case, when there is a time difference between the display time and the standard time, a correction value, in terms of the number of seconds, corresponding to the time difference is input through an input unit. The input correction value is calculated in a computing circuit, and is set as a new set value in the register. A time-counting signal based on the newly set value in the register is output from the comparator. This improves the accuracy of the time indicated on the display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.