Radio controlled timepiece

Details Radio controlled timepiece Radio controlled timepiece

1985-10-25

1987-03-17

Roskoski, Bernard

Horology: time measuring systems or devices

Plural timepiece system or system device

With wireless synchronization

368 59, 368202, G04C 1102

Patent

active

046503447

ABSTRACT:
A radio controlled timepiece includes a radio receiver for demodulating a transmitted signal on which time and date information has been encoded. A pulse sequence is derived from the transmitted radio signal which is used to drive the stepping motor which advances the hands of a standard display timepiece. If unfavorable reception conditions exist, then the stepping motor will not be driven smoothly and the poor reception will be readily apparent from the irregular movement of the clock hand. A switch is provided to allow the stepping motor to be normally driven by a pulse sequence output of a standard time keeping circuit. A comparator compares the time displayed on the face of the timepiece with the time information encoded on the radio signal and, if the displayed time deviates from the actual time, the frequency of the pulse sequence from the time keeping circuit is adjusted to correct the displayed time.

REFERENCES:
patent: 4315332 (1982-02-01), Sakami et al.
patent: 4316274 (1982-02-01), Ushikoihi
patent: 4525685 (1985-06-01), Hesselberth
patent: 4565454 (1986-01-01), Walters
Article, "Uhren durch Funk gesteurert", VDI-Nachrichten, No. 3, Jan. 21, 1977 (with translation for pertinent portions).
H. Effenberger, "Mikroprozessorgesteuerte Funkuhr mit Analoganzeige," Viertes Darmstadter Kolloquim, pp. 104-109, 1983.
G. Krug, "Funkferngersteuerte Uhren", Uhren and Schmuck 8 (1971) 2, pp. 57-59.

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