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| Number | Title | Issue Date |
| 7854544 | Correction apparatus and clock device using the same A clock device is provided for generating a real-time clock. The clock device includes a frequency generator, a measuring module, a setting module and a timing module. The frequency generator generates a frequency signal. The measuring module is coupled to the frequ... | 12/21/2010 |
| 7455447 | Method and apparatus for a portable device A method for a portable device is disclosed. A reference clock is provided. A first time value and a first index are recording at a first time point. A second index is recorded at a second time point. The first time point and the second time point are counted accord... | 11/25/2008 |
| 7327638 | Electronic timepiece Using an oscillating unit (601) that can start oscillation with a low voltage, an oscillation signal (S1) of the oscillating unit (601) is amplified via a waveform shaping unit (603), and is fed to a boosting control unit (105). A ... | 02/05/2008 |
| 7118269 | Method of correcting a real-time clock of an electronic apparatus A method of correcting a real-time clock of an electronic apparatus, notably a mobile telephone, in which the real-time clock operates with a first clock generator which generates a real-time clock while the electronic apparatus operates with a second clock generato... | 10/10/2006 |
| 6962081 | Semiconductor physical quantity sensor with improved noise resistance An inexpensive, accurate, and reliable semiconductor physical quantity sensor having improved resistance to noise is provided, wherein pads that have been pulled down to ground inside a semiconductor chip are arranged closer to a ground pad, while pads and that have... | 11/08/2005 |
| 6961287 | Time error compensating apparatus and method in a terminal A time-error-compensating apparatus and method corrects errors in a real-time clock caused by temperature fluctuations or other external influences. The apparatus includes a frequency counting unit which counts a high-frequency clock signal and a low-frequency clock... | 11/01/2005 |
| 6956793 | Phase clock selector for generating a non-integer frequency division A frequency divider circuit uses a base counter to frequency divide a clock signal with period T by an integer value N and employs a cyclic rotational select circuit to select among multiple equally phase shifted signals of a multiple phase clock to generate a fract... | 10/18/2005 |
| 6616328 | High accuracy timepiece Accuracy adjustment apparatus for a timepiece has an accuracy adjustment data input control section including a case-mounted switch such as a crown of the timepiece. A crown state detection signal is used to determine the state of the crown. When an accur... | 09/09/2003 |
| 6449217 | Low cost clock A time display is comprised of a low cost low accuracy RC oscillator. A series of pulses derived from this oscillator, for example, with a period of 1 second, is used for controlling a diode. An accurate time-display function of a car radio is also derive... | 09/10/2002 |
| 6304517 | Method and apparatus for real time clock frequency error correction A real time clock, suitable for use in mobile units in a radiocommunication system, is calibrated during production, and corrects for timing inaccuracies during normal operation. As a result, the accuracy of the real time clock's crystal oscillator is inc... | 10/16/2001 |
| 5881022 | Frequency shifing device and method for automatic clock adjustment A device (10) for automatically adjusting a device containing a clock (70) that derives its timing function from the frequency of an alternating current signal on a power line is provided. The device (10) includes a controller (15) that receives user-ente... | 03/09/1999 |
| 5825172 | Continuous up/down spectrum scaling of signals A rotating transmission line for use in spectrum up-scaling or down-scaling of signals. The rotating medium is characterized by different velocity gradients, whereby when a signal propagates in such medium, the signal undergoes a Doppler effect as it prop... | 10/20/1998 |
| 5740129 | Real time clock 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) r... | 04/14/1998 |
| 5717661 | Method and apparatus for adjusting the accuracy of electronic timepieces A method and apparatus for adjusting the accuracy of an electronic timepiece that includes an oscillator with a 2n frequency output, means for reducing the oscillator output frequency to a time keeping frequency, means for counting the time kee... | 02/10/1998 |
| 5596554 | Set operation in a timepiece having an electrooptical display A manual set operation is described for a timepiece where a single switch is used to select categories and values for setting timekeeping quantities. The timepiece is implemented using a CMOS microcontroller integrated circuit and employs a matrix liquid ... | 01/21/1997 |
| 5546363 | Clock apparatus for forming time information for use in computer system A commercially available clock IC which is easily influenced by a temperature change or the like is used as it is, thereby easily allowing the clock IC to function as a high precision clock IC. A high precision oscillator is provided separately from a clo... | 08/13/1996 |
| 5481507 | Electronic timekeeping device reduced adjustment data storage requirement To produce a time-base signal for timekeeping, an oscillator circuit generates an oscillator clock signal, which is counted cyclically with a programmable cycle length to establish a time-base cycle. The time-base signal is set and reset once in each time... | 01/02/1996 |
| 5440313 | GPS synchronized frequency/time source A GPS-based frequency/time source of the present invention provides an accurate, traceable low cost reference. In particular, the GPS-based frequency/time source includes a GPS receiver, a variable frequency oscillator and a micro processor. The GPS recei... | 08/08/1995 |
| 5412624 | Real-life timer interval adjustment A system and method for controlling time-critical functions by dynamically adjusting the interrupt frequency of a microprocessor. Interrupts are generated at a predetermined frequency. Time-critical functions are then performed in response to the interrup... | 05/02/1995 |
| 5375105 | Timekeeping rate regulator for crystal controlled watches and clocks An adjustable vibrations counter (20) and an elapsed time counter and switch (18) that select and adjust one second durations, the adjustment depending on whether the timekeeping rate of a watch or clock is fast or slow. The adjustable vibrations counter ... | 12/20/1994 |
| 5274545 | Device and method for providing accurate time and/or frequency A device and method provide for an accurate output from a unit, such as an oscillator and/or clock providing an output indicative of frequency and/or time. The device includes a processing section having a microprocessor that develops a model characterizi... | 12/28/1993 |
| 5255247 | Electronic timepiece including integrated circuitry An integrated circuit for an electronic timepiece includes at least one semiconductor nonvolatile memory device. Reference data can be checked across a pair of output terminals prior to being stored in at least one EPROM to check the accuracy and acceptab... | 10/19/1993 |
| 5253229 | Electronic timepiece including integrated circuitry An integrated circuit for an electronic timepiece includes at least one semiconductor nonvolatile memory device. Reference data can be checked across a pair of output terminals prior to being stored in at least one EPROM to check the accuracy and acceptab... | 10/12/1993 |
| 5218694 | Dual selection system for reference frequency for use in a clock A dual selection system for a reference frequency for use in a clock comprising a microcomputer for controlling the whole system and outputting a switching signal and frequency-demultiplying signals. A system oscillator produces an oscillation signal of 4... | 06/08/1993 |
| 5128909 | Advanced clock measurement system A system to measure time based on the output of a plurality of clocks employs a common oscillator, rather than a frequency synthesizer. Phase differences between a plurality of clocks are measured by mixing the output from each clock with the output of th... | 07/07/1992 |
| 4953148 | Elimination of magnetic influence on atomic clocks Improved atomic clocks and frequency standards of the type where the frequency of an oscillator is stabilized by locking via a phase lock loop to an atomic resonator and where the output of the clock is taken from this oscillator. Protective means are pro... | 08/28/1990 |
| 4943955 | Atomic clock An atomic clock of the type comprising a quartz oscillator, a tube contaig a material, the atoms of which have an hyperfine spectral transition, control means capable of generating, from the quartz oscillator, a control signal of a frequency that corresp... | 07/24/1990 |
| 4933920 | Sidereal clock The sidereal clock comprises a digital clock portion having a 60-Hz pulse source operating at line frequency of 60-Hz. It contains a means for periodically changing logic state at the 50/60-Hz select input of the prescale counter so that the digital clock... | 06/12/1990 |
| 4921467 | Local oscillators for radio receivers A local oscillator for a radio receiver includes a voltage controlled oscillator (VCO), a decoder and controller for providing a control voltage to the VCO, an error detector circuit for detecting an error in the frequency of the VCO on the basis of a rec... | 05/01/1990 |
| 4903251 | Accuracy adjustment for time-of-day clock using a microcontroller A microcontroller, software-based time-of-day clock compensates for inaccurate oscillator frequency by periodically correcting the time-of-day value using a calibration offset measured by manufacturing test equipment and permanently stored in nonvolatile ... | 02/20/1990 |
| 4845692 | Clocking device of substantially constant stability for short-term and long-term time measurement A clocking device of substantially constant stability for short-term and long-term measurements. This clocking device comprises first generators of a clocking signal with substantially constant stability for short-term measurements, and second generators ... | 07/04/1989 |
| 4763309 | Programming arrangement for a non-volatile memory for a timepiece This programming arrangement for a non-volatile memory incorporated in the inner circuit of a timepiece for adjusting the frequency of the time base thereof includes a support provided with a connector to be plugged in in place of the energy cell. The rat... | 08/09/1988 |
| 4737944 | Electronic timepiece In a temperature gradient adjustor for a temperature-compensated electronic watch, the temperature gradient adjusting range can be widened without any drop in the temperature gradient adjusting resolution of a temperature sensitive oscillator by adding a ... | 04/12/1988 |
| 4730286 | Circuit and method for correcting the rate of an electronic timepiece Rate change in a quartz crystal timepiece due, for example, to aging of a capacitance used for correcting the frequency-temperature characteristic of the crystal oscillator of the timepiece, is corrected by dividing the oscillator output signal to provide... | 03/08/1988 |
| 4708491 | Time of day clock A fundamental interval of time is derived from a clock signal of an inherent frequency emanating from an untrimmed crystal oscillator. Firmware and hardware of the time-of-day clock system are used to control and modify the time interval between interrupt... | 11/24/1987 |
| 4644484 | Stand-alone access control system clock control A card reader located in proximity to the central point of the secured area having a crystal controlled time base clock. Entry is granted when the proper information is entered to the card reader through a keypad or identification card. The clock is adjus... | 02/17/1987 |
| 4634288 | Auxiliary timing source for ac-powered electronic clocks An apparatus and method that provides an auxiliary timing source for electronic clocks, normally powered by alternating current (ac). The apparatus and method includes calibrating an inexpensive resistor-capacitor oscillator, powered by a battery. The osc... | 01/06/1987 |
| 4633422 | Apparatus for and method of compensating for variations due to aging Variations, due to aging, of resonant frequency characteristics of electromechanical resonators are compensated by an oscillator including the resonantor. An indication of the amount of time that the oscillator is operating addresses a table of values ind... | 12/30/1986 |
| 4537515 | Resonator temperature compensated time base and watch using said time base To compensate for frequency variation in the quartz oscillator 4, 6 due to temperature variation, a second quartz oscillator 12, 14 forming a thermal sensor is employed. The beat frequency fB (circuit 16) which is counted in the counter 26 for a period of... | 08/27/1985 |
| 4502790 | Electronic timepiece Time sharing of a processor in a timepiece allows for performance without interference of a plurality of functions including timekeeping and supplemental functions. An electronic timepiece includes an oscillator for producing a time-standard high frequenc... | 03/05/1985 |
