EP0427515A2 - Automatisch korrigiertes elektronisches Zeitgerät - Google Patents

Automatisch korrigiertes elektronisches Zeitgerät Download PDF

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Publication number
EP0427515A2
EP0427515A2 EP90312143A EP90312143A EP0427515A2 EP 0427515 A2 EP0427515 A2 EP 0427515A2 EP 90312143 A EP90312143 A EP 90312143A EP 90312143 A EP90312143 A EP 90312143A EP 0427515 A2 EP0427515 A2 EP 0427515A2
Authority
EP
European Patent Office
Prior art keywords
time
current time
electronic timepiece
correction
counting
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.)
Ceased
Application number
EP90312143A
Other languages
English (en)
French (fr)
Other versions
EP0427515A3 (en
Inventor
Yoshiki Minowa
Yukio Yokozawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Epson Corp
Original Assignee
Seiko Epson Corp
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.)
Filing date
Publication date
Priority claimed from JP2241997A external-priority patent/JPH03218494A/ja
Application filed by Seiko Epson Corp filed Critical Seiko Epson Corp
Publication of EP0427515A2 publication Critical patent/EP0427515A2/de
Publication of EP0427515A3 publication Critical patent/EP0427515A3/en
Ceased legal-status Critical Current

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Classifications

    • 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 invention relates to an automatically scorrected electronic timepiece suitable for use with a radio receiver and, in particular, to means for auto­matically correcting the electronic timepiece in accordance with an external signal.
  • an electronic time comprising time keeping means for counting a current time, correction means responsive to received time information signals for automatically correcting the current time, and characterised by calculating means responsive to the received time information signals for calculating current time compensation values, and means for periodically adjusting the corrected current time according to an output from the calculating means.
  • the invention also provides a radio receiver including such an electronic timepiece.
  • an external signal which is input through an antenna 10, is converted into a digital signal by a radio receiver 11 and, then, it is decoded by a decoder circuit 12. If the decoder circuit 12 judges the external signal to contain time information, the decoded external signal is transmitted to an operating circuit 13.
  • the reference numerals 14 and 15 designate a display and switching apparatus, respectively.
  • time information trans­mitted from the decoder circuit 12 is checked once again in the operating circuit 13 to perform a time infor­mation judgement 20.
  • Time information is detected critically in order to avoid the considerable influence caused by wrong information.
  • the decoder circuit examines whether a received signal represents time information or not. Then, that information is checked again in the operating circuit 13 to establish whether it really exists as data therein. For example, if a signal "15" is received as month data, the operating circuit 13 judges this signal to be a false one, even if it has already been checked and decoded in the de­coder circuit 12. Decoded time information is then written in a time information recording portion of the operating circuit 13 or current time memory thereof (step 21).
  • the current time in a time keeping circuit included in the operating circuit 13 of an electronic timepiece with an external sjgnal receiving function is automatically corrected (step 23).
  • the time error between the received time information and the current time previously kept by the timepiece at that time is calculated as a correction value (step 24).
  • the time information recording portion or a further time keeping circuit thereof which counts the time interval from each time correction, is initialised (step 22) and then begins to count the time interval until the next time information is received.
  • the calculated correction value is divided by the previous final count in the further time keeping circuit of the operating circuit 13 (step 25). The result of this division is added to the current time when the electronic timepiece is fast, and is subtracted when it is slow, on the next occasion for incrementing the current time and at predetermined time intervals thereafter (step 26).
  • the accuracy of the automatic time correction is affected by the accuracy of the external time infor­mation. It is also affected by the electronic timepiece itself because the time correcting process within it requires a certain time. After the time correction, the accuracy of the current time keeping becomes the same as that of the corrected time. Therefore, when a crystal of 32768 Hz, of the type normally employed in electronic timepieces, is used in the present electronic timepiece, an error of twenty seconds per month is produced at a standard temperature. For example, if the automatic time correction takes place every hour, an error of 0.03 seconds at the maximum is produced every hour. Although the error can be reduced conventionally by providing short time intervals for the automatic time correction, this consumes more electrical current.
  • the transmitted wave is in a bad condition, the error may accumulate whereupon the time could be corrected at the second time unit level on the next automatic time correcting occasion.
  • the time keeping function would then become dis-continuous and such an electronic timepiece would not be desirable for use in apparatus for measurement or in a stopwatch, even if it had the automatic functions of receiving correct time information and correcting the current time.
  • the accuracy of such a conventional electronic timepiece is no greater than the accuracy of an ordinary one.
  • the time error arising between the time information receiving occasions is divided by a certain time unit (the length of the time information receiving interval) and is fed back into the time keeping.
  • a certain time unit the length of the time information receiving interval
  • the current time may be made 0.01 second slower every thirty minutes from the next time keeping occasion. In this way, it becomes possible to keep the time with much greater accuracy than by simply counting the current time for time keeping.
  • the current time is affected by ageing or by temperature changes during the four seasons, it is possible to correct the time automatically in such an electronic timepiece, which makes it possible to keep the time with high accuracy without punctual time correcting.
  • external time information accompanied by pre-determined address information is transmitted by way of an information bus, which is connected to an information receiving circuit 40.
  • a first counter circuit 44 is provided for counting the magnitude of the correction made in the automatic time correction and a second counter circuit 45 is provided for counting the time interval of the automatic time correction. Both of the circuits 44, 45 can be included in an operating circuit 42.
  • the received signal is converted into a digital signal in the information receiving circuit 40 and is then decoded in a decoder circuit 41.
  • the decoder circuit 41 On receiving the pre-determined address designation signal from the information receiving circuit 40, the decoder circuit 41 transmits the decoded time information to the operating circuit 42.
  • the transmitted time information is written in a current time memory of a time keeping circuit in the operating circuit 42 and the time is automatically corrected in this way.
  • the value of the correction is counted in the first counter circuit 44, with the time interval between the last time correction and this time correction being counted in the second counter circuit 45 every pre-determined time unit, for example every ten minutes.
  • the correction value counted in the first counter circuit 44 is divided by the time interval counted in the second counter circuit 45, in the operating circuit 42, and the current time is compen­ sated in accordance with the result of this calculation at every time unit of the second counter circuit after the automatic time correction.
  • FIG. 4 Another embodiment shown in Figure 4 includes an antenna 50, a radio receiving circuit 51 and a decoder circuit 52.
  • An operating circuit 53 receiving external time information in the same way as the operating circuit in Figure 1, reads the information from the last time correction mezriorised in a memory circuit 59 and counts the time interval from the last time correction. At the same time, the operating circuit 53 calculates the compensation value to be employed on this occasion, according to the difference between the time kept in a time keeping circuit 57 and the time received from the external time information.
  • the compensation value per unit "A" is calculated by dividing the difference by the counted time interval and is memorised in the memory circuit 59.
  • the time keeping circuit 57 keeps the time by dividing a signal from an oscillating circuit 56.
  • a time compensating circuit 58 constitutes the dividing circuit for the time keeping circuit 57, in which a 256 Hz frequency is divided into a 1 Hz frequency. without receiving a time compensation signal from the operating circuit 53, the dividing circuit counts the 256 Hz frequency 256 times and outputs the 1 Hz frequency. swhen the time compensation signal is received, the count may be reset.
  • the time can be compensated per unit every 1/256 second when the time to be compensated per unit "A" is calculated.
  • the operating circuit 53 sets 256 per certain unit time in the time compensating circuit 58 if a 1/256 second retardation is required every time unit.
  • the present invention is not limited to the embodiments described above and can also be applied to other communication apparatus having various time keeping functions, for example apparatus for measure­ment, and stopwatches or timers of high resolution.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)
EP19900312143 1989-11-08 1990-11-06 Automatically corrected electronic timepiece Ceased EP0427515A3 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP290514/89 1989-11-08
JP29051489 1989-11-08
JP241997/90 1990-09-12
JP2241997A JPH03218494A (ja) 1989-11-08 1990-09-12 時間精度自動修正時計

Publications (2)

Publication Number Publication Date
EP0427515A2 true EP0427515A2 (de) 1991-05-15
EP0427515A3 EP0427515A3 (en) 1991-10-09

Family

ID=26535551

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900312143 Ceased EP0427515A3 (en) 1989-11-08 1990-11-06 Automatically corrected electronic timepiece

Country Status (1)

Country Link
EP (1) EP0427515A3 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0624014A2 (de) * 1993-05-05 1994-11-09 Addison M. Fischer Personenbezogene Einrichtung zur notariellen Beglaubigung des Datums und der Zeit
EP0691598A2 (de) * 1994-07-04 1996-01-10 GRUNDIG E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig holländ. Stiftung & Co. KG. Verfahren und Anordnung zum Betreiben einer Software-Uhr in einem Gerät der Unterhaltungselektronik
US5655218A (en) * 1994-07-29 1997-08-05 Motorola, Inc. Radiotelephone communication unit displaying chronological information
US6865678B2 (en) 1993-05-05 2005-03-08 Addison M. Fischer Personal date/time notary device
CN103092068A (zh) * 2011-11-03 2013-05-08 珠海精准电子有限公司 一种校时方法及其系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2715096A1 (de) * 1977-04-04 1978-10-12 Wolfgang Prof Dr Ing Hilberg Funkuhr-einstellung
EP0042913A2 (de) * 1980-06-19 1982-01-06 Werner Dipl.-Ing. Schulz Verfahren zum automatischen Stellen autonomer Funkuhren mit Hilfe eines Zeitzeichens
EP0305200A2 (de) * 1987-08-27 1989-03-01 Precision Standard Time, Inc. Durch Radiosignale überwachte digitale Uhr

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2715096A1 (de) * 1977-04-04 1978-10-12 Wolfgang Prof Dr Ing Hilberg Funkuhr-einstellung
EP0042913A2 (de) * 1980-06-19 1982-01-06 Werner Dipl.-Ing. Schulz Verfahren zum automatischen Stellen autonomer Funkuhren mit Hilfe eines Zeitzeichens
EP0305200A2 (de) * 1987-08-27 1989-03-01 Precision Standard Time, Inc. Durch Radiosignale überwachte digitale Uhr

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0624014A2 (de) * 1993-05-05 1994-11-09 Addison M. Fischer Personenbezogene Einrichtung zur notariellen Beglaubigung des Datums und der Zeit
EP0624014A3 (de) * 1993-05-05 1995-03-08 Addison M Fischer Personenbezogene Einrichtung zur notariellen Beglaubigung des Datums und der Zeit.
EP0770953A3 (de) * 1993-05-05 1997-10-15 Addison M Fischer Vorrichtung zur Notierung persönlicher Daten und Termine
US5936149A (en) * 1993-05-05 1999-08-10 Fischer; Addison M. Personal date/time notary device
US6865678B2 (en) 1993-05-05 2005-03-08 Addison M. Fischer Personal date/time notary device
EP0691598A2 (de) * 1994-07-04 1996-01-10 GRUNDIG E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig holländ. Stiftung & Co. KG. Verfahren und Anordnung zum Betreiben einer Software-Uhr in einem Gerät der Unterhaltungselektronik
EP0691598A3 (de) * 1994-07-04 1998-05-20 GRUNDIG Aktiengesellschaft Verfahren und Anordnung zum Betreiben einer Software-Uhr in einem Gerät der Unterhaltungselektronik
US5655218A (en) * 1994-07-29 1997-08-05 Motorola, Inc. Radiotelephone communication unit displaying chronological information
CN103092068A (zh) * 2011-11-03 2013-05-08 珠海精准电子有限公司 一种校时方法及其系统
WO2013063960A1 (zh) * 2011-11-03 2013-05-10 珠海精准电子有限公司 一种校时方法及其系统
CN103092068B (zh) * 2011-11-03 2014-12-31 珠海精准电子有限公司 一种校时方法及其系统

Also Published As

Publication number Publication date
EP0427515A3 (en) 1991-10-09

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