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Timekeeper with automatic time setting and time setting method for same
| Details |
Inventors: Gerrits, Johannes F.; Piguet, Christian; Brand, Yan;
Assignee: CSEM Centre Suisse d'Electronique et de Microtechnique SA-Recherche et Developpement (Neuchatel, CH)
Primary Examiner: Trost; William
Assistant Examiner: Balaoing; Ariel
Attorney, Agent or Firm: Jacobson Holman PLLC
A timekeeper equipped with a radio reception device capable of decoding Radio Data System (RDS) information and including a time base, a display for displaying time data supplied by the time base, and an adjustment control for correcting the time data. The radio reception device includes a frequency locking loop for delivering RDS type data derived from a RDS spectrum received on a high-frequency carrier; and a controller which, on the basis of the delivered RDS type data, controls the adjustment control to ensure time setting of the timekeeper. The timekeeper is portable and the radio reception device rejects the spectrum received from a frequency modulated transmitter supplying RDS data, except for the frequency band containing RDS type data. |
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DETAILED DESCRIPTION An object of the invention is to provide a timekeeper equipped with an RDS radio reception device for radio synchronizing it using time data of broadcasts by an RDS station of any kind received by the RDS radio reception device, the power consumption of the timekeeper being compatible with the energy storage capacity of the batteries usually used in timepieces.
The invention therefore consists in a timekeeper as defined hereinabove characterized in that the timekeeper is designed to be worn, and the radio reception device further includes means for rejecting the spectrum received from a frequency modulated transmitter supplying RDS data, except for the frequency band containing the RDS data.
Thanks to the above features, the internal time of the timekeeper can be corrected as a function of the local time supplied by an RDS transmitter, the consumption of the radio reception portion of the timekeeper being minimized because only the band of frequencies onto which the timing data is modulated is extracted from the demodulated band of frequencies of the HF carrier received.
Furthermore, as an RDS transmitter has a short range, much less than the geographical region covered by a time zone, and as RDS stations are widespread in all geographical regions, the timekeeper according to the invention will in all circumstances adopt the local time of the RDS transmitter that, in the geographical region in which the watch is located, has the transmission power necessary and sufficient for good reception.
The change of time zone or the changeover from wintertime to summertime or vice-versa is therefore automatic with the timekeeper according to the invention.
In the present description, the expression "local time" refers to the time data provided by the RDS portion of the FM signal and that indicates the date and the GMT universal time accompanied by the offset value corresponding to the geographical location of the transmitter station.
According to one preferred feature of the invention, said radio reception device includes a frequency locking loop in the feedback branch of which is inserted a band stop filter blocking said band of frequencies containing the RDS data
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