Sound generator in particular for a timepiece
US5668783A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 13, 1996 |
| Grant date | Sep 16, 1997 |
| Priority date | — |
| Expiry date | Sep 13, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10H1/057
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sound generator comprises a transducer (3) intended to be supplied with a signal having a frequency determining the sound to be produced and having a variable amplitude (envelope). To this effect, the transducer is connected in series with the principal path of a semiconductor component (5). The control electrode of this semiconductor component (5) is connected to a RC-circuit (1, 7) capable of providing control pulse trains having said envelope. The RC-circuit comprises a capacitor (7) and at least one input branch (13) of a current mirror (11) the output branch (12) of which supplies a control electrode of the semiconductor component (5). Preferably, the capacitor (7) is connected in series with the input branch (13). Application in particular to wrist-watches equipped with an audible alarm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.