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EP1253488B1 - Zeithaltendes Gerät mit automatischer Zeitkorrektur und Verfahren zur Zeitkorrektur eines derartigen Gerätes - Google Patents

Zeithaltendes Gerät mit automatischer Zeitkorrektur und Verfahren zur Zeitkorrektur eines derartigen Gerätes Download PDF

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Publication number
EP1253488B1
EP1253488B1 EP01401093A EP01401093A EP1253488B1 EP 1253488 B1 EP1253488 B1 EP 1253488B1 EP 01401093 A EP01401093 A EP 01401093A EP 01401093 A EP01401093 A EP 01401093A EP 1253488 B1 EP1253488 B1 EP 1253488B1
Authority
EP
European Patent Office
Prior art keywords
data
time
rds
timekeeper
time data
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01401093A
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English (en)
French (fr)
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EP1253488A1 (de
Inventor
Johannes F. Gerrits
Christian Piguet
Yan Brand
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Centre Suisse dElectronique et Microtechnique SA CSEM
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Centre Suisse dElectronique et Microtechnique SA CSEM
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Centre Suisse dElectronique et Microtechnique SA CSEM filed Critical Centre Suisse dElectronique et Microtechnique SA CSEM
Priority to DE60127810T priority Critical patent/DE60127810T2/de
Priority to EP01401093A priority patent/EP1253488B1/de
Priority to JP2002586084A priority patent/JP2004530132A/ja
Priority to PCT/EP2002/004537 priority patent/WO2002088849A1/fr
Priority to US10/475,081 priority patent/US7031696B2/en
Publication of EP1253488A1 publication Critical patent/EP1253488A1/de
Application granted granted Critical
Publication of EP1253488B1 publication Critical patent/EP1253488B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04R—RADIO-CONTROLLED TIME-PIECES
    • G04R20/00—Setting the time according to the time information carried or implied by the radio signal
    • G04R20/20—Setting the time according to the time information carried or implied by the radio signal the radio signal being an AM/FM standard signal, e.g. RDS
    • G04R20/22—Tuning or receiving; Circuits therefor
    • G—PHYSICS
    • G04—HOROLOGY
    • G04R—RADIO-CONTROLLED TIME-PIECES
    • G04R40/00—Correcting the clock frequency
    • G04R40/06—Correcting the clock frequency by computing the time value implied by the radio signal

Definitions

  • the present invention relates to the radiosynchronization of timepieces whose setting can be done automatically from an RDS radio broadcasting transmitter (acronym of "Radio Data System”).
  • the radio stations working in the FM frequency modulation band according to the RDS standard emit a time signal containing the time and date, this signal being encoded in a so-called CT portion of a frame transmitted with the audio signal. from the station.
  • FIG. 1 of the appended drawings shows the normalized baseband spectrum emitted by the stations of this type and modulating in frequency a carrier P whose frequency is specific to the transmitting station.
  • this spectrum has a first band B1, monophonic, located between 0 and 15 kHz and in which is contained the sum of the audio signals of the right and left channels of the signal to be transmitted.
  • a 19 kHz FP pilot frequency is used to decode the stereo information, while a second stereophonic B2 band from 23 to 53 kHz contains the difference of the right and left audio signals.
  • a third band B3 contains the RDS data. This spectrum band is centered on 57 kHz with a bandwidth between 54.5 and 59.5 kHz.
  • the radio reception device RDS described in the aforementioned patent uses the time data of the RDS frame contained in the band B3 of the spectrum of Figure 1 to ensure the radio synchronization of a clock provided as a timekeeper in the receiver.
  • the reception device since the reception device is primarily intended for listening to the audio programs provided by the stations on which it can be granted, it must include reception circuits and sound reproduction that require a relatively large amount of energy to operate.
  • the receiving device must have a power source of large capacity whose radio synchronization removes a very small part.
  • a power source of large capacity whose radio synchronization removes a very small part.
  • such a source is naturally readily available in the form of the on-board vehicle network so that the amount of energy required for the radio synchronization does not pose any problem to the designer.
  • radio sets could also be powered by the sector or an onboard network of a vehicle.
  • the energy storage capacity available in a timepiece is a permanent problem that watchmakers try to answer by reducing, as far as possible, the consumption of all the components of the timepiece in order to give it as much autonomy as possible with a battery of size compatible with that of the timepiece.
  • the transposition of the concept described in the aforementioned patent to a timepiece worn for the purpose of radiosynchronizing using RDS data thus faces a problem of power supply, because it is understood that a timepiece, such as a wristwatch, can not accommodate a power source of sufficient capacity that the assembly, including an RDS-type radio frequency receiver and radio-synchronized clock circuits can operate for a reasonable period of time.
  • a wristwatch battery typically has a voltage of 1.3 V able to deliver a current of the order of 1 mA maximum only, with a lifetime of the stack extending preferably over a year or more.
  • Radiosynchronized watches are also known in which there is provided a radio receiver tuned to a station transmitting a time signal on a long wave carrier, typically between 40 and 80 kHz. These stations are exclusively dedicated to radio-synchronization and, because of their frequency of transmission and their power, they cover a territory extending over several time zones at a time. The time on which the watch equipped with the appropriate reception means will be synchronized will therefore not necessarily correspond to the time zone in which the user of the watch is located. On the other hand, the consumption related to the radio-synchronization function of such a watch is relatively low and in any case compatible with a period of normal use of the power source of the watch. The reason is that the low radio frequency, carrying the synchronization information, allows the use of means whose consumption is low. This prior concept can therefore also provide a satisfactory solution for the realization of a timepiece carried radio-synchronized by the broadcasts of high frequency radio stations transmitting time data according to the RDS standard.
  • the object of the invention is to provide a timepiece equipped with an RDS type radio reception device for the radio synchronization using the time data of the transmissions performed by any station of the RDS type received by the radio reception device.
  • RDS type the energy consumption of this timepiece is compatible with the energy storage capacity of batteries usually used in watchmaking.
  • the invention therefore relates to a timepiece as defined in independent claim 1.
  • the internal time of the timepiece can be corrected according to the local time provided by an RDS-type transmitting station, the consumption of the radio reception part of the timepiece being reduced to a minimum by the that only the frequency band on which the temporal data is modulated is extracted from the demodulated frequency band of the received high frequency carrier.
  • the timepiece according to the invention will in all circumstances adopt the local time of the RDS-type transmitting station which, in the geographical area of the watch, has the transmission power necessary and sufficient for good reception.
  • the change of time zone or the transition from winter time to summer time or vice versa is therefore automatic with the timepiece according to the invention.
  • local time is understood to mean the time data provided by the RDS part of the FM signal and which indicates the date as well as the universal time GMT accompanied by the offset value corresponding to the geographical position of the transmitting station.
  • said FM radio reception device of the RDS type comprises a frequency lock loop in the reaction branch from which is inserted a band rejection filter that does not let said frequency band comprising the RDS type data.
  • the subject of the invention is also a method for setting a timepiece by radio-synchronization, said method being defined by independent claim 4.
  • a radio-synchronized timepiece preferably in the form of a wristwatch, comprising a time base 1 providing hourly data. These are applied to time setting means 2 allowing manual adjustment of the timepiece by means of a crown mechanism 3.
  • the hourly data are loaded into memory means 4 and applied to a display device 5.
  • the memory means 4 contain progressive information of the seconds, minutes and hours and other temporal information such as the day, the date, the year, etc. These data will be referred to hereinafter as "internal data”. They correspond to the "internal time" of the timepiece.
  • the display device 5 may be analog or digital or may present both types of display at a time.
  • other time indication functions for example day and date, chronograph and / or countdown function, etc. can be provided. All of these means is managed for example by a microcontroller 6.
  • the worn timepiece also includes a radio reception device 7 type RDS.
  • An antenna 8 capable of sensing the FM band of FM stations transmitting RDS information applies a received carrier signal to a low noise amplifier 9 whose output signal is transmitted to a frequency lock loop 10
  • the antenna 8 can be made as described in EP 0 399 482, for example.
  • the frequency locked loop 10 comprises a mixer 11, an intermediate frequency amplification and filtering circuit 12, an oversampling circuit 13, a demodulator 14 of the frequency modulation, a local oscillator 15 controlled by a voltage and a band stop filter 16 mounted in the reaction branch of the frequency locked loop, the local oscillator 15 being looped back to the mixer 11.
  • the frequency lock loop 10 may be similar to that described in US Patent 4,426,735, for example.
  • the oversampling circuit 13 may be that described in patent EP 0 624 959.
  • the filter 16 is made in such a way that it lets all the demodulated frequency spectrum pass except for the standardized frequency band for the transmission of the RDS information. Therefore, the filter 16 does not let the frequency band between 54.5 and 59.5 kHz, centered on the frequency of 57 kHz. It can be done in accordance with the requirements described in an AB Williams and FJ Taylor Manual entitled “Electronic Filter Design Handbook”. Electronic Filter Design) and edited by McGraw-Hill, Inc., New York, USA
  • the frequency lock loop 10 attenuates all the frequencies of the modulated spectrum on the carrier of the transmitting station except the RDS band B3 ( Figure 1) which will therefore appear in demodulated form at the output of the demodulator 14
  • the latter is further connected to an RDS demodulator 17, in which the RDS information is demodulated and transmitted to a decoding circuit 18.
  • the latter is designed to extract from the RDS information the hourly data representing the time of day. a radio station of local RDS type in the reception area of which is the timepiece equipped as just described.
  • the receiver device 7 rejects the spectrum of the demodulated band contained in the received radio signal, with the exception of the frequency band in which the CT frame of the RDS information is coded.
  • the radio reception device 7 of the timepiece according to the invention is devoid of the circuits for restoring the audio information contained in the received signal so that its consumption can be limited to a strict minimum while being compatible with the duration of life that is usually required of a watch battery.
  • the local time data provided by the decoding circuit 18 are introduced into memory means 19.
  • the memory means 4 and 19 are connected to the microcontroller 6 responsible for operating them as described below.
  • These hourly data contained in the memory 19 are scalable and will be called “local data”. They correspond to a "local time" of the transmitter picked up at a given moment.
  • the microcontroller 6 can be programmed to implement a strategy for controlling the internal time and, if necessary, setting the timepiece.
  • the microcontroller 6 can also be used to monitor the evolution over time of the differences between the internal and local hours and, if this evolution shows a systematic error of operation of the timepiece, to order a correction of walk.
  • US Pat. No. 3,895,486 describes a timepiece having such correction means.
  • step E1 To check the time of the timepiece, it is first carried out at step E1, in search of a transmitter providing a radio program in frequency modulation comprising an RDS type signal.
  • the microcontroller 6 applies an appropriate signal to the local oscillator 15 via a connection 20, the search being able to be performed by varying the tuning frequency in steps of 100 kHz, for example .
  • a transmitter will be retained, when the received signal level exceeds a predetermined value sufficient to ensure good detection of the RDS type signal.
  • the demodulated RDS signal appears at the output of the demodulator 17.
  • the corresponding signal is applied to the decoder 18 and the local time data is placed in the memory means 19 (step E2).
  • Step E3 compares the current internal data placed in the memory means 4 with the decoded local data and placed in the memory means 19. If the data coincide, the internal time of the timepiece corresponds to the local time. of the transmitter in question and it is assumed that the timepiece indicates the correct time, no action being taken.
  • the microcontroller 6 controls the standby of the receiver 7 (step E4) so as to save power supply.
  • the microcontroller 6 is preferably programmed so that the receiver 7 is powered again after a predetermined period of time (step E5), so that a new control of the internal time can take place.
  • the time interval between two consecutive checks of the internal time will be made adjustable by means of the setting control 2, an appropriate display of this interval and its possible modification may also take place on the device. 5.
  • step E3 If, during step E3, the internal time does not correspond to the local time, it is of course possible that the timepiece does not have the exact time, but it is also possible that the transmitter found indicates an incorrect time. This is why in step E6, a new transmitter search is carried out. This search takes place under the same conditions as during the execution of step E3.
  • step E7 the second local time data provided by this transmitter are decoded and also placed in the memory means 19.
  • the microcontroller 6 compares with during step E8 between the local time provided by the previous transmitter and the time that has just been decoded and coming from the second transmitter.
  • step E9 the microcontroller 6 then controls the storage of the difference ⁇ t between the local time and the internal time.
  • the microcontroller 6 controls the standby of the receiver 7 (step E4), a new time control can be performed after expiration of the standby interval.
  • the timepiece is provided with a so-called coherence function whereby the microcontroller 6 is able to adjust the step of the time base 1 when it presents a drift as mentioned previously.
  • the method described makes it possible to correct the step, for example, when a systematic error due to this drift is observed in the timepiece's progress.
  • step E10 a test is carried out to check whether the ⁇ t values recorded successively, at regular time intervals, during consecutive control processes increase or decrease systematically. If this is not the case, during a step E11 it is then proceeded to setting the time of the timepiece by correcting the internal time of the value ⁇ t.
  • the microcontroller 6 can proceed to the correction of the internal time as soon as a difference ⁇ t is detected (step E9).
  • step E11 it is possible to correct not only the time, but also the date (day, month, year).
  • the method according to the invention thus allows to reset the timepiece according to the time zones in which it is worn, this registration can be made as and when the spindles are crossed, for example during a trip. It does not matter then that the next time zone is shifted by half an hour compared to the previous one as it is the case for certain time zones, the time setting being also carried out in this case. Of course, if the shift is one or more hours, it is enough to correct only the internal data of the hours as well as the display of the hours.
  • step E10 the microcontroller 6 proceeds to the setting of the convergence of step (step E12) by acting, in a manner known per se on the basis of time 1, before proceeding to the setting time of step E11.
  • radio-synchronization as just described is particularly useful in worn timepieces such as wristwatches in which the power supply is provided by a low-capacity rechargeable battery by a generator animated by movements to wear. Indeed, such watches stop quickly when they are not worn.
  • the method according to the invention allows, when the watch is resumed, not only a precise time setting, but also the correction of other time data such as day, date and year.
  • the method according to the invention is also very effective for all the timepieces powered by a battery. After changing the battery, the correction of its hourly data is then automatic and precise.
  • the microcontroller 6 can conclude either at a passage from the winter time to the daylight saving time, or a change of time zone due to the passage of the timepiece holder from one time zone to another.
  • FIG. 4 represents an alternative radio reception device 7A which, in addition to the circuits similar to those of FIG. 2 and provided with the same references, comprises a phase-shifter 21 connected to the output of the broadband amplifier 9.
  • a first signal received modulated carrier, not out of phase, is applied to a first mixer 22, while a second modulated carrier signal received, out of phase by 90 °, is applied to a second mixer 23.
  • the outputs of the two mixers 22 and 23 are connected the circuit 12 of amplification and filtering intermediate frequency.
  • timepiece worn should be interpreted broadly. Thus, it applies not only to wristwatches in particular, but also to any timepiece equipped with a low-capacity energy source, such as travel alarms or the like.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Electric Clocks (AREA)
  • Electromechanical Clocks (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Claims (9)

  1. Tragbares Präzisions-Zeitmessgerät, das mit einer Funkempfangseinrichtung ausgestattet ist, die imstande ist, eine RDS-Information (7, 7A) zu decodieren, und das umfasst:
    - einen Zeitgeber (1),
    - Mittel (5) zum Anzeigen der von dem Zeitgeber gelieferten Zeitangaben, und
    - Mittel (2, 3) zum Korrigieren der Zeitangaben,
    und bei dem die Funkempfangseinrichtung (7, 7A) umfasst:
    - Mittel (10) zum Übergeben von Daten vom Typ RDS, die aus einem RDS-Spektrum herausgezogen worden sind, das auf einem hochfrequenten Träger empfangen wird; und
    - Steuermittel (4, 6, 19), die anhand der übergebenen Daten vom Typ RDS die Korrekturmittel (2) steuern, um den Abgleich des Präzisions-Zeitmessgerätes sicherzustellen,
    dadurch gekennzeichnet, dass
    - die Funkempfangseinrichtung (7, 7A) außerdem Mittel (10) umfasst, die dafür ausgelegt sind, das NF-Spektrum in dem Basisband, das von einem RDS-Daten liefernden frequenzmodulierten Sender empfangen worden ist, bis auf das Frequenzband, in dem die Daten vom Typ RDS enthalten sind, zu verwerfen, und
    dadurch, dass
    - das Präzisions-Zeitmessgerät Mittel (18) zum Decodieren der Daten vom Typ RDS umfasst, die dafür ausgelegt sind, dass sie nur die lokalen Zeitdaten aus den Daten vom Typ RDS decodieren.
  2. Präzisions-Zeitmessgerät nach Anspruch 1, dadurch gekennzeichnet, dass die Funkempfangseinrichtung (7, 7A) eine Frequenzregelschleife (10) umfasst, in deren Rückkopplungszweig ein Bandsperrfilter (16) eingefügt ist, das das Frequenzband, das die Daten vom Typ RDS umfasst, nicht durchlässt.
  3. Präzisions-Zeitmessgerät nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Steuermittel (4, 6, 19) umfassen:
    - erste Speichermittel (4), um die vom Zeitgeber (1) gelieferten internen Zeitdaten abzuspeichern,
    - zweite Speichermittel (19), um die aus den von mindestens einem frequenzmodulierten Sender empfangenen Daten vom Typ RDS decodierten Zeitdaten abzuspeichern, und
    - Analysemittel (6), um die lokalen Zeitdaten mit den internen Zeitdaten zu vergleichen und um die Uhrzeit des Präzisions-Zeitmessgerätes zu korrigieren, wenn diese lokalen und internen Daten verschieden sind.
  4. Verfahren zum Abgleichen eines tragbaren Präzisions-Zeitmessgerätes durch Funksynchronisation, umfassend folgende Schritte:
    - Suchen des Sendesignals eines frequenzmodulierten Senders, dessen Spektrum Daten vom Typ RDS enthält,
    - Demodulieren der Daten vom Typ RDS und Decodieren der in diesen Daten vom Typ RDS enthaltenen lokalen Zeitdaten,
    - Vergleichen der internen Uhrzeit des Präzisions-Zeitmessgerätes mit den auf diese Weise decodierten lokalen Zeitdaten,
    - und gegebenenfalls Nachstellen der internen Uhrzeit des Präzisions-Zeitmessgerätes, wenn die interne Uhrzeit von den decodierten lokalen Zeitdaten abweicht,
    dadurch gekennzeichnet, dass
    - das Verfahren außerdem einen Schritt umfasst, der darin besteht, das von dem Sender empfangene NF-Spektrum im Basisband bis auf das Frequenzband, in dem die Daten vom Typ RDS enthalten sind, zu verwerfen, und einen Schritt, der darin besteht, nur die lokalen Zeitdaten aus den Daten vom Typ RDS zu decodieren.
  5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass es zu Zeitpunkten ausgeführt wird, die durch im Voraus festgelegte Zeitintervalle voneinander getrennt sind, in denen der Empfang des Sendesignals unterbrochen ist.
  6. Verfahren nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass es die folgenden Schritte umfasst:
    - Auffangen des Sendesignals, das Daten vom Typ RDS enthält, von einem frequenzmodulierten Sender,
    - Extrahieren erster lokaler Zeitdaten aus diesem Signal,
    - Vergleichen dieser ersten lokalen Zeitdaten mit der internen Uhrzeit des Präzisions-Zeitmessgerätes,
    - im Fall eines Unterschieds zwischen den ersten lokalen Zeitdaten und der internen Uhrzeit, Auffangen mindestens eines zweiten Sendesignals, das Daten vom Typ RDS enthält, von einem zweiten frequenzmodulierten Sender,
    - Extrahieren zweiter lokaler Zeitdaten aus diesem zweiten Sendesignal,
    - Vergleichen der zweiten lokalen Zeitdaten mit den ersten lokalen Zeitdaten, und
    - Durchführen des Abgleichs des Präzisions-Zeitmessgerätes, um den Unterschied zu annullieren, nur dann, wenn die ersten lokalen Zeitdaten gleich den zweiten lokalen Zeitdaten sind.
  7. Verfahren nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass es in dem Fall, in dem die interne Uhrzeit von den lokalen Zeitdaten um eine oder mehrere ganze Stunden abweicht, darin besteht, nur die Stundenangabe des Präzisions-Zeitmessgerätes zu korrigieren.
  8. Verfahren nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, dass es einen Schritt umfasst, der darin besteht, die Entwicklung der Differenz zwischen der internen Uhrzeit und den lokalen Zeitdaten zu analysieren und eine Gangkorrektur des Präzisions-Zeitmessgerätes durchzuführen, wenn die Differenz bei mehreren aufeinanderfolgenden Operationen zum Vergleichen der internen Uhrzeit mit den lokalen Zeitdaten einen systematischen Fehler angibt.
  9. Verfahren nach einem der Ansprüche 4 bis 8, dadurch gekennzeichnet, dass das Verwerfen des von dem Sender empfangenen NF-Spektrums im Basisband, ausgenommen das Frequenzband, in dem die Daten vom Typ RDS enthalten sind, durch Einfügen eines Bandsperrfilters (16), das in dem Rückkopplungszweig einer Frequenzregelschleife (10) des Präzisions-Zeitmessgerätes realisiert wird, und das die Daten vom Typ RDS umfassende Frequenzband nicht durchlässt.
EP01401093A 2001-04-27 2001-04-27 Zeithaltendes Gerät mit automatischer Zeitkorrektur und Verfahren zur Zeitkorrektur eines derartigen Gerätes Expired - Lifetime EP1253488B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE60127810T DE60127810T2 (de) 2001-04-27 2001-04-27 Zeithaltendes Gerät mit automatischer Zeitkorrektur und Verfahren zur Zeitkorrektur eines derartigen Gerätes
EP01401093A EP1253488B1 (de) 2001-04-27 2001-04-27 Zeithaltendes Gerät mit automatischer Zeitkorrektur und Verfahren zur Zeitkorrektur eines derartigen Gerätes
JP2002586084A JP2004530132A (ja) 2001-04-27 2002-04-24 自動時間設定を有するタイムキーパおよびそのための時間設定方法
PCT/EP2002/004537 WO2002088849A1 (fr) 2001-04-27 2002-04-24 Garde-temps avec mise a l'heure automatique et procede de mise a l'heure d'un tel garde-temps
US10/475,081 US7031696B2 (en) 2001-04-27 2002-04-24 Timekeeper with automatic time setting and time setting method for same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01401093A EP1253488B1 (de) 2001-04-27 2001-04-27 Zeithaltendes Gerät mit automatischer Zeitkorrektur und Verfahren zur Zeitkorrektur eines derartigen Gerätes

Publications (2)

Publication Number Publication Date
EP1253488A1 EP1253488A1 (de) 2002-10-30
EP1253488B1 true EP1253488B1 (de) 2007-04-11

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US (1) US7031696B2 (de)
EP (1) EP1253488B1 (de)
JP (1) JP2004530132A (de)
DE (1) DE60127810T2 (de)
WO (1) WO2002088849A1 (de)

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US20040127234A1 (en) 2004-07-01
US7031696B2 (en) 2006-04-18
EP1253488A1 (de) 2002-10-30
DE60127810T2 (de) 2007-12-27
JP2004530132A (ja) 2004-09-30
DE60127810D1 (de) 2007-05-24
WO2002088849A1 (fr) 2002-11-07

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