Horology: time measuring systems or devices – Plural timepiece system or system device – With wireless synchronization
Patent
1979-11-15
1982-11-09
Miska, Vit W.
Horology: time measuring systems or devices
Plural timepiece system or system device
With wireless synchronization
368 51, G04C 1102
Patent
active
043588360
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.
REFERENCES:
patent: 3881310 (1975-05-01), Gerum et al.
patent: 4078419 (1978-03-01), Busch et al.
patent: 4083222 (1978-04-01), Stawiski
patent: 4187518 (1980-02-01), Martin et al.
Kamiya Kenji
Tohyama Nobuo
Yamano Shozo
Yoshida Jun-ichi
Miska Vit W.
Ricoh Watch Co., Ltd.
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