Sound generator in particular for a timepiece

Details Sound generator in particular for a timepiece Sound generator in particular for a timepiece

1996-09-13

1997-09-16

Miska, Vit W.

Horology: time measuring systems or devices

Signalling means

Time condition responsive

368255, 84702, G04C 2100, G04C 2116, G10H 102

Patent

active

056687834

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.

REFERENCES:
patent: 4236437 (1980-12-01), Howell et al.
patent: 4529322 (1985-07-01), Ueda
patent: 4567806 (1986-02-01), Kodaira
patent: 4796503 (1989-01-01), Lin
patent: 5493543 (1996-02-01), Kamens

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