Electronic watch with an automatic time indication modifier
US4358836A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1979 |
| Grant date | Nov 9, 1982 |
| Priority date | — |
| Expiry date | Nov 15, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04G5/041
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electronic watch including a watch circuit and display is provided which additionally includes an automatic time indication modifier. The modifier comprises a receiver, a filter for passing only that component of the signal from the receiver which has the same frequency as a time announcement signal, a pulse height discriminator for converting an output signal of the filter into a bi-level signal in accordance with the magnitude of the output signal above a threshold level, a time announcement pattern discrimination circuit responsive to the bi-level signal from the discriminator to determine the presence of a time announcement pattern on the basis of the duration of and the time interval between the bi-level signals, and a "seconds" indication modifying and control circuit for modifying a "seconds" indication of the watch in response to an output signal from the discrimination circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.