EP1004948A2 - Montre peu chère - Google Patents
Montre peu chère Download PDFInfo
- Publication number
- EP1004948A2 EP1004948A2 EP99118280A EP99118280A EP1004948A2 EP 1004948 A2 EP1004948 A2 EP 1004948A2 EP 99118280 A EP99118280 A EP 99118280A EP 99118280 A EP99118280 A EP 99118280A EP 1004948 A2 EP1004948 A2 EP 1004948A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- oscillator
- microcontroller
- clock
- low accuracy
- time
- 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.)
- Withdrawn
Links
Images
Classifications
-
- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G3/00—Producing timing pulses
- G04G3/02—Circuits for deriving low frequency timing pulses from pulses of higher frequency
-
- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G3/00—Producing timing pulses
- G04G3/02—Circuits for deriving low frequency timing pulses from pulses of higher frequency
- G04G3/027—Circuits for deriving low frequency timing pulses from pulses of higher frequency by combining pulse-trains of different frequencies, e.g. obtained from two independent oscillators or from a common oscillator by means of different frequency dividing ratios
Definitions
- the present invention relates to a device with a means for Show the time based on a clock, the rate for the clock is given by an oscillator with low accuracy, which works continuously and provides impulses while the device is equipped with a microcontroller with a very precise clock, but which is switched off when the device is switched off.
- an oscillation control circuit comprises an astable multivibrator and display means such as Example a light emitting diode connected to the astable multivibrator and is controlled by it.
- An object of the invention is to provide an inexpensive one Watch, which nevertheless has good precision.
- the device is provided with means that at least if the device is turned off, are active to the microcontroller periodically to start for a moment, and to tune the frequency of the Low accuracy oscillators using the very accurate clock calibrate while the microcontroller is on and by means to use the result of the calibration to display a corrected Time.
- the car radio of Figure 1 comprises an antenna 1, a tuner 2, which an intermediate frequency amplifier and demodulator 3 and then one with a loudspeaker 5 connected audio amplifier 4 follows.
- a microcontroller 9 For administration all functions of the car radio is a microcontroller 9, the is connected by a bus 19 to the above elements.
- the removable front panel 16 includes a keyboard 10 and a display screen 7.
- a blinking LED flashes (LED) 17.
- the pulses used for this flashing LED will be by an inexpensive, based on a known circuit Using low precision RC oscillator 6, for example an integrated circuit of the type HEF4528. This oscillator controls diode 17 directly.
- An interface 20 leads from this oscillator on the bus 19 a series of pulses with a period from to Example 1 second.
- This oscillator also becomes a time display function for the car radio derived. This is possible if the main microcontroller 9 the Low-precision oscillator periodically using their own, exact crystal clock 21 calibrated, i.e. the period of the RC oscillator measures in the microcontroller that of the RC oscillator correct time spent.
- step 11 the oscillator sends a pulse to the microcontroller.
- step 12 the microcontroller during the for the Blinking of the LED, plus incrementing a first counter, necessary time woken up.
- step 13 when the first counter reaches a predetermined one Has reached value "n" (J), the microcontroller then calibrates in step 15 the RC oscillator; if it has not done so (N), then the Microcontroller stopped.
- the microcontroller starts for calibration simply a second internal counter (based on an exact Crystal oscillator) at the impulse arrival event and stops it at the next Pulse event ( Figure 5). After that, the clock value is last through this Calibration for the period from the previous calibration (or as Alternative until next calibration) corrected.
- the microcontroller creates on the basis of an "incorrect" Beat a "true” beat.
- the clock is of course only displayed when the radio is switched on. When the radio is turned off the real time is saved every minute every time when the microcontroller is woken up.
- n 60 (calibration every minute) seems a good compromise to be: It increases the quiescent current of the entire car radio compared to the case without calibration by only 2% during the Error in the clock pulse estimate is then only 1 PPM (in one Environment where the temperature would change 10 times faster the error would only be 10 PPM, i.e. previously negligible).
- the upper curve of Figure 5 represents two successive pulses of flashing LED, and the lower curve shows the clock pulses of the microcontroller.
- the microcontroller counts the number of clock pulses between two successive pulses. The absolute mistake in the Measurement of the pulse rate by the microcontroller's oscillator given by the difference between En and En + 1. It's completely random its average being half the microcontroller clock period and when measuring the pulse period on a large number of Samples can be neglected.
- the microcontroller is with one Register for storing the count between En and En + 1 equipped with the number of pulses received from the oscillator represents.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99118280A EP1004948A3 (fr) | 1998-09-22 | 1999-09-15 | Montre peu chère |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98402328 | 1998-09-22 | ||
EP98402328 | 1998-09-22 | ||
EP99118280A EP1004948A3 (fr) | 1998-09-22 | 1999-09-15 | Montre peu chère |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1004948A2 true EP1004948A2 (fr) | 2000-05-31 |
EP1004948A3 EP1004948A3 (fr) | 2006-02-15 |
Family
ID=26151697
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99118280A Withdrawn EP1004948A3 (fr) | 1998-09-22 | 1999-09-15 | Montre peu chère |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP1004948A3 (fr) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2616398B1 (de) * | 1976-04-14 | 1977-10-06 | Siemens Ag | Schaltungsanordnung zur regelung der impulsfolgefrequenz eines signals |
US4305041A (en) * | 1979-10-26 | 1981-12-08 | Rockwell International Corporation | Time compensated clock oscillator |
EP0052884A1 (fr) * | 1980-11-26 | 1982-06-02 | Societe Suisse Pour L'industrie Horlogere Management Services S.A. | Garde-temps comprenant une chaîne de diviseurs au rapport de division ajustable |
EP0586256A2 (fr) * | 1992-09-04 | 1994-03-09 | Nokia Mobile Phones Ltd. | Système de mesure de temps |
-
1999
- 1999-09-15 EP EP99118280A patent/EP1004948A3/fr not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2616398B1 (de) * | 1976-04-14 | 1977-10-06 | Siemens Ag | Schaltungsanordnung zur regelung der impulsfolgefrequenz eines signals |
US4305041A (en) * | 1979-10-26 | 1981-12-08 | Rockwell International Corporation | Time compensated clock oscillator |
EP0052884A1 (fr) * | 1980-11-26 | 1982-06-02 | Societe Suisse Pour L'industrie Horlogere Management Services S.A. | Garde-temps comprenant une chaîne de diviseurs au rapport de division ajustable |
EP0586256A2 (fr) * | 1992-09-04 | 1994-03-09 | Nokia Mobile Phones Ltd. | Système de mesure de temps |
Also Published As
Publication number | Publication date |
---|---|
EP1004948A3 (fr) | 2006-02-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE3108848C2 (fr) | ||
DE3938941A1 (de) | System zur bestimmung des schlafzustands | |
DE3224838A1 (de) | Elektronische uhr mit einer quarzkristall-oszillatorschaltung | |
DE2431825A1 (de) | Digitale schaltungsanordnung zum messen der momentanen frequenz von durch impulse dargestellten ereignissen | |
EP0015873B2 (fr) | Oscillateur avec un résonateur basse fréquence à quartz | |
DE2528812B2 (de) | Antiprellschaltkreis | |
DE2807214C3 (de) | Zeitmeßeinrichtung | |
DE2641205A1 (de) | Verfahren und schaltungsanordnung zum messen der frequenz eines wobbelsignalgenerators | |
DE2934849A1 (de) | Verfahren und vorrichtung zum kalibrieren eines kristallgesteuerten frequenzzaehlers | |
DE3107580C2 (fr) | ||
DE2456156C2 (de) | Analog-Digital-Wandler | |
EP1004948A2 (fr) | Montre peu chère | |
DD287803A5 (de) | Verfahren und elektronisches system fuer die erfassung und verarbeitung zeitbezogener daten | |
EP0753756A2 (fr) | Circuit et procédé pour mesurer la différence de capacité entre deux capacités | |
DE2543342A1 (de) | Schaltungsanordnung und verfahren zur messung der genauigkeit eines zeitmessers | |
DE2327685C3 (de) | Elektronische Einrichtung zur Zeitbestimmung | |
EP1393084B1 (fr) | Dispositif de mesure de frequence | |
DE102004003156A1 (de) | Elektronische Steuereinheit und Fahrgast-Erfassungsvorrichtung für Fahrzeuge | |
DE2158522B2 (de) | Elektronisch gesteuerte uhr, insbesondere armbanduhr | |
DE2951760A1 (de) | Fluessigkristallanzeigegeraet | |
DE2944157C2 (de) | Verfahren und Einrichtung zum Messen des Pulses einer Person | |
DE3133527C2 (fr) | ||
DE2700359B2 (de) | Elektronische Uhr | |
DE3444634C2 (de) | Einrichtung zur Stimulation des Entspannungsverhaltens | |
DE3038727C2 (de) | Elektronisches Uhrwerk |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: SIEMENS AKTIENGESELLSCHAFT |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
AX | Request for extension of the european patent |
Extension state: AL LT LV MK RO SI |
|
AKX | Designation fees paid |
Designated state(s): DE FR GB |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20060817 |