EP0726508A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Real time clock suitable for a mobile telephone
Assignee: Nokia Oyj
•
Filing: 1996-01-24
•
Granted: —
•
Expires: 2016-01-24
Abstract
Abstract A real time clock is arranged to generate output signals indicative of time of day. An oscillating device (101) produces a first clocking signal which is adjusted in response to a calibration value to produce an output clocking signal. A processor (102) re-calculates the calibration value in response to external clocking signals received from a cellular base station for mobile telephones. The clock may be provided within a mobile telephone and the oscillating device may also be used to provide sleep clock signals allowing a high frequency system clock to be de-activated for periods while the telephone is in a stand-by condition.
Inventors
- 👤 Simon Frampton
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 20:27
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/02; H04W52/0209; H04W52/0261; H04W52/0287; H04W52/029; G; G04; G04R; G04R40/00; G04R40/02; G04R40/06; H04W56/00; H04W56/0035; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
72 words
A real time clock arranged to generate output signals indicative of time of day, comprising an oscillating device arranged to produce a first clocking signal, clock frequency adjustment means arranged to process the first clocking signal in response to a calibration value to produce an output clocking signal; and processing means arranged to re-calculate the calibration value in response to external clocking signals received from a cellular base station for mobile telephones.
Claim 2
Dependent Claim
17 words
A clock according to claim 1, wherein the output signals consist of pulses generated at 1 Hz.
Claim 3
Dependent Claim
19 words
A clock according to claim 2, wherein the 1 Hz pulses are counted to produce one pulse per minute.
Claim 4
Dependent Claim
19 words
A clock according to claim 3, wherein the one minute pulses are counted to produce one pulse per hour.
Claim 5
Dependent Claim
25 words
A clock according to any of claims 1 to 4, wherein the oscillating device oscillates at a frequency of between 1 kHz and 1 MHz.
Claim 6
Dependent Claim
32 words
A clock according to any of claims 1 to 5, wherein the clock frequency adjustment means is arranged to count a predetermined number of first clocking pulses determined by said calibrated value.
Claim 7
Dependent Claim
23 words
A clock according to claim 6, wherein the predetermined number has a nominal value which is increasable or decreasable by the calibrated value.
Claim 8
Dependent Claim
23 words
A clock according to claim 7, wherein the nominal value is adjusted by the calibrated value at a predetermined number of clock counts.
Claim 9
Dependent Claim
25 words
A clock according to claim 8, wherein the nominal value is adjusted by the calibrated value for a calibrated number of minutes in each hour.
Claim 10
Dependent Claim
34 words
A clock according to any of claims 1 to 9, fabricated as part of a mobile telephone, wherein calibration with reference to the external clocking signal is performed when the mobile telephone is operational.
Claim 11
Dependent Claim
99 words
A real time clock operational within a mobile telephone according to claim 10, wherein said mobile telephone has a high frequency system clock, processing means arranged to process polling signals received during a predetermined portion of a repeated periodic cycle, first counting means for counting system clock pulses, second counting means for counting said first clocking signal, means for re-activating a system clock after a calibrated number of first clocking signal pulses, means for re-loading the first counting means and calibration means for calibrating the calibrated number by comparing the re-loaded system clock count with base station timing signals.
Claim 12
Dependent Claim
18 words
A telephone according to claim 11, wherein the system clock is de-activated after the completion of cycle processing.
Claim 13
Dependent Claim
20 words
A telephone according to claim 12, wherein system clock re-activation occurs at a predetermined position within each repeated periodic cycle.
References Cited (Backward Citations)
US4114363A
Cited
EP0305200A2
Cited
EP0565180A2
Cited
EP0586256A2
Cited
EP0619685A2
Cited
EP0635941A1
Cited
GB2288899A
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.