Clock apparatus for forming time information for use in computer system
US5546363A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1994 |
| Grant date | Aug 13, 1996 |
| Priority date | — |
| Expiry date | Dec 19, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04G7/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A commercially available clock IC which is easily influenced by a temperature change or the like is used as it is, thereby easily allowing the clock IC to function as a high precision clock IC. A high precision oscillator is provided separately from a clock circuit as a clock IC. On the basis of a clock signal from the high precision oscillator, a predetermined time, for example, one minute is measured by a high precision clock control circuit. A correction signal is transmitted to the clock circuit as a clock IC from a high precision control circuit every measurement of such a predetermined time, thereby allowing the correcting operation of the time information to be executed. The clock circuit is, consequently, made operative at a precision of the high precision oscillating circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.