Alarm electronic timepiece

Details Alarm electronic timepiece Alarm electronic timepiece

1978-05-19

1980-06-03

Miska, Vit W.

Horology: time measuring systems or devices

Signalling means

Time condition responsive

368 72, G04B 1300, G04B 1312

Patent

active

042055172

ABSTRACT:
An alarm electronic timepiece comprises a time circuit including a time standard signal oscillator for generating a time signal fed to a time display portion for displaying time. An alarm device is driven by an alarm driving circuit to produce an audible alarm sound. An alarm signal compound circuit develops a plurality of signals having different duty cycles and having a frequency in the audible frequency range, and serially arranges the plurality of signals in a predetermined pattern to form an alarm signal composed of the serially arranged signals of different duty cycles which is applied to the alarm driving circuit to produce an audible alarm sound having a predetermined sound pressure variation pattern.

REFERENCES:
patent: 3861263 (1975-01-01), Okudaira
patent: 4014167 (1977-03-01), Hasegawa et al.
patent: 4055843 (1977-10-01), Whitaker
patent: 4073133 (1978-02-01), Earls et al.
patent: 4090349 (1978-05-01), Takase
patent: 4098071 (1978-07-01), Kawakami et al.
patent: 4104862 (1978-08-01), Yamazaki et al.

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