Abstract: Example embodiments relate to GNSS time synchronization in redundant systems. A redundant system configured with two subsystems may initially synchronize clocks from both subsystems to GNSS time from a GNSS receiver. The synchronization of the first subsystem's clock may involve using a first communication link that enables communication between the first subsystem and the GNSS receiver while the synchronization of the second subsystem's clock may involve using both the first communication link and a second communication link that enables communication between the subsystems. The redundant system may then synchronize the first subsystem's clock to the second subsystem's clock while the second subsystem's clock is still synchronized to GNSS time from the GNSS receiver based on timepulses traversing a pair of wires that connect the subsystems and the GNSS receiver.

Abstract: In an analog electronic watch system, a terminal equipment detects current display positions of hands in an image of the hands and a dial plate, and generates current display time information based on the current display positions. An analog electronic watch corrects the display positions of the hands based on the display time information. The terminal equipment at least acquires hand identification information including hand shape information about a shape of the hand of the analog electronic watch based on watch identification information transmitted from the analog electronic watch. The terminal equipment detects the current display positions based on the hand identification information, and transmits display time information based on the current display positions to the analog electronic watch.

Abstract: A method for indicating one-way latency in a data network, with continuous clock synchronization, between first and second node having clocks that are not synchronized with each other includes a continuous synchronization session and a measurement session. The method repetitively sends predetermined synchronization messages from the first node to the second node and from the second node to the first node, calculates a round trip time for each message at the first node, updates a synchronization point if the calculated round trip time is smaller than a previously calculated round trip time, stores the updated synchronization points of a synchronization window, and calculates a virtual clock from the updated synchronization points of the synchronization window. The measurement session collects multiple measurements of one-way latency between the first and second nodes using the virtual clock, and generates a latency profile by interpolating the multiple measurements.

Abstract: Disclosed is a system comprising a portable electronic device, and a backend device, wherein the portable electronic device is configured to, upon occurrence of a triggering event, send a first request message to the backend device, the backend device, upon receipt of the first request message, is configured to read an internal device clock and send a first response message to the portable electronic device, wherein the first response message comprises information about the present internal device time. The portable electronic device, upon receipt of the first response message, is further configured to at least one of update an internal clock of the portable electronic device with the present internal device time, and send a second response message to an object, wherein the second response message comprises an information about the present internal device time.

Abstract: A host handles reliability management of memory systems. The host analyzes characteristics of data associated with a select memory system among the memory systems. The host determines a reliability control mode and one or more reliability schemes among reliability schemes to be applied to the select memory system based on the characteristics. The host provides reliability management information indicating the reliability control mode to the select memory system. The plurality of reliability schemes includes error correction code (ECC), read retry, intra redundancy and refresh schemes.

Abstract: A transmitting method stores data making up a coded stream into a predetermined data unit and transmits the stored data in the predetermined data unit. The transmitting method further generates presentation time information indicating a presentation time of the predetermined data unit, based on reference time information received from an external source; and transmits the predetermined data unit, first control information which includes the generated presentation time information, and second control information which includes leap second information indicating whether or not the presentation time information is a time that is before a leap second adjustment. A receiving method receives the predetermined data unit, first control information, and second control information; and reproduces the received predetermined data unit based on the first and second control information that are received.

Abstract: The present disclosure relates to delivery of data traffic over a wireless connection. In more particular, it relates to methods, a tunneling unit (208), and system for emulating wired connectivity between two or more robot devices (202, 204) and a controller (222). Buffering (212) of data frames, from two or more robot devices, received up-streams a wireless access network (206) is performed. Based on the time-stamps extracted (210) from data frames a relative time offset is determined for the two or more robot devices. Buffered uplink frames are forwarded (216) to the controller in a pre-define order, enabling using the relative time offset when forwarding downlink frames (232), being received over the wireless access network (206), to said two or more robot devices, such the that the downlink frames reach each one of two or more robot devices simultaneously. A deterministic delivery of data frames over a wireless connection is provided.

Abstract: Methods and systems for data communication using the single wire communication protocol and the universal asynchronous receiver-transmitter (UART) communication protocol are disclosed. The method includes receiving by a first device a reset pulse. The method includes operating the first device in a standard speed single wire protocol if the width of the reset pulse is between 480 and 640 micro seconds. The method includes operating the first device in an overdrive speed single wire protocol if the width of the reset pulse is between 48 and 80 micro seconds. The method includes operating the first device in a universal asynchronous receiver-transmitter (UART) protocol if the width of the reset pulse is between 240 and 480 micro seconds. The method includes transmitting by the first device an answer responsive to the reset pulse. The method includes synchronizing the first device with a host device responsive to the reset pulse.

Abstract: A method for exchanging a clock synchronization packet performed by a network apparatus, including: exchanging a clock synchronization packet with a first clock source, where the network apparatus includes a boundary clock; determining a first time deviation of the boundary clock relative to the first clock source according to the clock synchronization packet exchanged with the first clock source, where the boundary clock avoids performing an operation of calibrating a time of a local clock of the boundary clock according to the first time deviation; and sending a clock synchronization packet to a first slave clock of the boundary clock, where the clock synchronization packet includes a first timestamp, a value of the first timestamp is equal to a first corrected value, and the first corrected value is a value obtained by the boundary clock by correcting the time of the local clock by using the first time deviation.

Abstract: Assisted-GPS for a portable biometric monitoring device is provided. The portable biometric monitoring device may obtain updated ephemeris data from an associated secondary device via a short-range, low-power communication protocol. The secondary device may be a computing device such as a smartphone, tablet, or laptop. Various rules may control when the ephemeris data is updated. The ephemeris data may be used in the calculation of the global position of the portable biometric monitoring device. Additionally, the portable biometric monitoring device may communicate downloaded position fixing data to the associated secondary device. The associated secondary device may then calculate the global position from the position fixing data.

Abstract: A clock retiming circuit and method of operating a clock retiming circuit are described herein. A clock retiming circuit generates a retimed clock based on an input clock. The clock retiming circuit may have a normal mode when the input clock is available to the clock retiming circuit, and a retention mode that is entered in response to the input clock no longer being present. The clock retiming circuit resumes the normal mode in response to the clock again being present. The retention mode is a low current mode, in one aspect. Thus, the clock retiming circuit may operate in a low current mode when the input clock is not available. The clock retiming circuit may be tolerant to loss of the input clock. The clock retiming circuit may quickly re-establish the retimed clock in response to the input clock again becoming available.

Abstract: Approaches for managing how the passage of time is observed by a software execution environment, such as a virtual machine or a sandbox environment. A computer system maintains a set of physical time sources. A set of virtual time sources are computed based on the set of physical time sources. The virtual time sources operate independently of the set of physical time sources. For example, the virtual time sources may observe time passing faster or slower than the set of physical time sources. The set of virtual time sources are presented to the software execution environment as the set of time sources. Many benefits may be obtained such as higher utilization of allocated resources and avoidance of timeouts.

Abstract: Systems and methods for a continuous monitoring of analyte values received from an analyte sensor system are provided. One method for a wireless data communication between an analyte sensor system and a mobile device involves storing identification information associated with a transceiver of the analyte sensor system, the identification information entered by a user of the mobile device via a custom application running on the mobile device; causing the custom application to enter a background mode; searching for advertisement signals; receiving an advertisement signal from the transceiver; authenticating the transceiver based on the identification information; prompting the user to bring the custom application to a foreground mode; causing the custom application to request a confirmation from the user that a data connection with the transceiver is desired; receiving the confirmation from the user; and completing the data connection with the transceiver.

Abstract: In a time synchronization process, chain of quality information is provided between interconnected nodes, the chain of quality information relating to information regarding accuracy of a clock, a type of timestamping used by a node, a type of link over which a timestamp is provided, and a clock drift parameter indicating the drift characteristics of the clock. Based on the chain of quality information, parameters are determined for a filter that is applied to a sequence of timestamps in order to remove noise from the timestamps, thereby improving accuracy of the time synchronization process.

Abstract: A timepiece includes a case that is made of a conductive material, a bezel that is made of a nonconductive material, a patch antenna that is disposed inside the case and at the back side of the dial, and a bezel that is made of a ceramic.

Abstract: A location determining method 200 for sensor apparatus placements in building includes: a step in which a first measuring device transmits a digitally modulated first test packet through a specific channel at a first location in a building (210); a step in which a second measuring device receives the first test packet and transmits a first echo back signal through the specific channel at a second location in the building (220); a step in which the first measuring device receives the first echo back signal transmitted from the second measuring device and measures a first channel quality of the specific channel based on the first echo back signal (230); a step in which the first measuring device transmits a digitally modulated second test packet through the specific channel (240); a step in which the second measuring device receives the second test packet and transmits a second echo back signal through the specific channel (250); and a step in which the first measuring device receives the second echo back signa

Abstract: A mobile terminal including a wireless communication unit configured to perform wireless communication with a wearable device; a touch screen; a sensor unit configured to sense at least one of a mobile terminal acceleration signal and a mobile terminal vibration signal; and a controller configured to display a screen corresponding to an application executing on the mobile terminal, receive first state information from the wearable device indicating at least one of a wearable device acceleration signal and a wearable device vibration signal of the wearable device, receive second state information from the sensor unit indicating said at least one of the mobile terminal acceleration signal and the mobile terminal vibration signal of the mobile terminal, and transfer operations of the application executing on the mobile terminal to the wearable device, based on the first and second state information.

Abstract: Systems and methods are disclosed for utilizing slave (receive) time-stamp clock rates that are different from master (sender) time-stamp clock rates to randomize and thereby reduce systematic time-stamp granularity errors in the communication of network packets. The slave (receive) time-stamp clock rate for some embodiments is set to be a fixed value that has a relationship with the master (sender) time-stamp clock rate such that the ratio of the slave (receive) clock rate to the master (sender) clock rate is a rational number. Other embodiments use a time-varying frequency for the slave (receive) time-stamp clock rate to randomize the slave (receive) time-stamp clock with respect to the master (sender) time-stamp clock. Additional time-stamps can also be generated using a slave (receive) time-stamp clock having a rate set to equal the rate of the master (sender) time-stamp clock signal.

Abstract: A method for detecting a timing reference affected by a change in path delay asymmetry in a communications network comprising a master node having a master clock and a plurality of slave nodes each having a respective slave clock is provided. The method comprises: determining that a first timing reference received by a first slave node indicates a time correction to its slave clock greater than a time correction threshold; determining whether one or more other slave nodes have received a timing reference indicating a time correction to their slave clock greater than a time correction threshold; and determining whether the first timing reference is affected by a change in path delay asymmetry based on the determining of whether one or more other slave nodes have received a timing reference indicating a time correction to their slave clock greater than a time correction threshold.

Abstract: Embodiments are provided for audio synchronization of one or more playback devices using offset information. A playback device may join a synchrony group upon a command, where the synchrony group may have a group coordinator that provides timing information for the group. In one case, the playback device may retrieve offset information from memory storage, where the information represents the offset between a clock of the playback device and the clock of the group coordinator. In another case, the playback device may determine that the offset information is not available in storage and as a result, the offset information may be computed. In one instance, the offset information may be computed using other offsets obtained from storage, such as offsets between other devices in the synchrony group. In another instance, the offset information may be computed using SNTP polling.

Abstract: A timepiece includes a case that is made of a conductive material, a bezel that is made of a nonconductive material, a patch antenna that is disposed inside the case and at the back side of the dial, and a bezel that is made of a ceramic.

Abstract: A method and system for maintaining clock synchronization in a communication network having multiple clocks are disclosed. According to one aspect, the invention provides a first precision time protocol (PTP) instance and second PTP service instance. Dynamic PTP parameters and tuning PTP parameters are periodically cloned from the first PTP service instance to the second PTP service instance substantially in real time.

Abstract: According to embodiments described in the specification, a method, system and apparatus for generating notification signals are provided. The method includes storing an identifier of a slave device in a memory of a master device; detecting, at a processor interconnected with the memory, a notification message via execution of a notification application; in response to detecting the notification message, retrieving the slave device identifier and transmitting an instruction message to the slave device, the instruction message including an identifier of the notification message and an alert parameter; and generating an alert via an output device interconnected with the processor according to the alert parameter.

Abstract: An EtherCAT packet forwarding system with distributed clocking is provided. The system comprises a master device and a plurality of slaves. The master comprises a processing port and a forward port for being respectively coupled to the at least two Ethernet ports of the master device in a redundant ring topology. The slaves comprise an internal clock indicating a current time, and a slave memory comprising a processing timestamp variable, a forwarding timestamp variable, a temporary timestamp variable and a copy-direct bit.

Abstract: A method and arrangement are provided for time synchronization between two geographically separated stationary clocks, such as first and second clocks located respectively at first and second ends of an AC power line. A first representation of an oscillating power line quantity is produced by measuring or recording the power line quantity at the first end of the power line, and time-stamping the first representation by the first clock. A second representation of the same oscillating power line quantity is produced by measuring the power line quantity at the second end of the power line, and time-stamping the second representation by the second clock. The first and second representations are compared to determine a clock offset between the first and second clocks. Based on the comparison, one or both of the first and second clocks are adjusted to reduce the determined clock offset.

Abstract: An analog wearable electronic device that is operationally coupleable to a transmitting device. The transmitting device permits viewing a simulation of a display provided on the wearable electronic device, changing information displayable on the simulated display and transmitting the changed information and/or information from which the changed information is derivable to the wearable electronic device. The wearable electronic device includes a receiver for receiving from the transmitting device the changed information and/or the information from which the changed information is derivable. A controller assembly processes the changed information and/or derives the changed information, and an actuation mechanism moves a display indicator based at least in part on the changed information. The changed information is thereafter reflected on the display of the wearable electronic device by the display indicator.

Abstract: A time information obtaining device and a radio-controlled timepiece are shown. According to one implementation, the time information obtaining device includes the following. A code identifying section identifies each code of a code string in a radio wave. A first portion parity calculating section calculates a portion parity where a parity bit of a variable code is subtracted from a parity code showing a parity bit for a code string portion. A first portion parity deciding section decides a portion parity based on a calculated number of portion parities. A second portion parity deciding section obtains a portion parity from an invariable code other than the variable code. A parity confirming section confirms a match between the portion parities decided by the first portion parity deciding section and the second portion parity deciding section.

Abstract: A timer key relating to monitoring a countdown time of a countdown routine of an electronic device is disclosed. The timer key comprises a processor configured to respond to a countdown time associated with operation of the electronic device, a display operably coupled with the processor, and a housing configured to house at least the processor. The housing has an associated structure configured to engage with the electronic device to share the countdown time between the electronic device and the timer key. The processor is configured to begin a countdown routine based at least in part on the countdown time, wherein the countdown routine is at least substantially synchronized with a countdown routine of the electronic device when the timer key is removed from the electronic device. A system and method for synchronizing countdown routines of a timer key and an electronic device are also disclosed.

Abstract: An analog wearable electronic device that is operationally coupleable to a transmitting device. The transmitting device includes means for viewing a simulation of a display provided on the wearable electronic device, changing information displayable on the simulated display and transmitting the changed information and/or information from which the changed information is derivable to the wearable electronic device. The wearable electronic device includes a receiver for receiving from the transmitting device the changed information and/or the information from which the changed information is derivable. A controller assembly processes the changed information and/or derives the changed information, and an actuation mechanism moves a display indicator based at least in part on the changed information. The changed information is thereafter reflected on the display of the wearable electronic device by the display indicator.

Abstract: A wristwatch includes a face having a first area, in which the hour of the time associated with a first time zone is displayable; a second area, in which the hour of the time associated with a second time zone is displayable; and a third area, in which the minutes past the respective hours of the first and second time zones is displayable. The first area includes an analog display of an hour hand without a minute hand; the second area includes an analog display of an hour hand without a minute hand; and the third area includes an analog display of a minute hand without an hour hand. Each of the displays alternatively could be digital. Each of the areas preferably is compartmentalized and physically separated from the other areas on the face of the wristwatch.

Abstract: An information processing apparatus includes: a communication device communicating with an external device and a clock server; a first clock measuring a local time; a second clock measuring a time based on time information from the clock server; a storage device storing setting information; and a controller performing: when receiving the time information from the external device, judging whether a specified condition is met; when the specified condition is met, setting a time indicated by the time information to the first clock as the local time; when the specified condition is met, controlling the first clock to measure the local time, without the controller setting the time to the first clock as the local time; setting the time indicated by the time information to the second clock and setting a time determined based on the time of the second clock and the setting information to the first clock.

Abstract: A slave device includes: a clock unit that outputs time information; a message receiving unit that receives messages sent from a master device; a message sending unit that sends messages to the master device; a calculation unit that calculates a correction value necessary for correcting the time on the clock unit; and a correction unit that corrects the time on the clock unit based on the correction value calculated by the calculation unit.

Abstract: In one embodiment, a computer readable medium is provided that includes a date time zone dimension table comprising a date key and a time zone key, the date key identifying a selected point in time relative to a selected temporal origin and the time zone key identifying one of a plurality of possible time zones, and at least one attribute, the at least one attribute describing time information for a selected date and time zone key pair.

Abstract: A timer key relating to monitoring a countdown time of a countdown routine of an electronic device is disclosed. The timer key comprises a processor configured to respond to a countdown time associated with operation of the electronic device, a display operably coupled with the processor, and a housing configured to house at least the processor. The housing has an associated structure configured to engage with the electronic device to share the countdown time between the electronic device and the timer key. The processor is configured to begin a countdown routine based at least in part on the countdown time, wherein the countdown routine is at least substantially synchronized with a countdown routine of the electronic device when the timer key is removed from the electronic device. A system and method for synchronizing countdown routines of a timer key and an electronic device are also disclosed.

Abstract: A transparent clock adaptor is provided for use with a router, switch or other network device that does not otherwise support transparent clock functionality. The transparent clock adaptor comprises a network port for coupling to a link of a network, a local port for coupling to a port of the network device, transparent clock processing circuitry operative to perform one or more transparent clock timing adjustment operations for each of a plurality of packets including at least one packet arriving in the adaptor via the network port and at least one packet arriving in the adaptor via the local port, and a synchronization interface for communicating with a corresponding synchronization interface of at least one other transparent clock adaptor. The adaptor can operate both as an ingress adaptor for packets arriving over the network link for delivery to the network device and as an egress adaptor for packets arriving from the network device for delivery over the network link.

Abstract: The present invention discloses a method, a device, a server, and a system for configuring daylight saving time, belonging to the field of communications. The method includes: receiving, by a CPE, a message carrying a daylight saving time rule parameter; if a daylight saving time enable flag displays that daylight saving time is enabled, extracting, by the CPE, the daylight saving time rule parameter from the message; obtaining the current year of the CPE; and obtaining start time or end time of daylight saving time according to the current year and the daylight saving time rule parameter. The system includes a CPE and a server. The CPE includes a receiving module, an extracting module, a first obtaining module, and a second obtaining module. The server includes a generating module and a sending module. Through the present invention, daylight saving time can be configured in a single attempt and used permanently.

Abstract: Apparatus for providing timing information, the apparatus comprising: a primary reference time clock (PRTC) that provides a reference time of day (ToD) and a reference frequency; a packet master clock that receives the ToD and reference frequency and is configured to distribute timing to a slave clock in accordance with a timing over packet procedure responsive to the ToD and the reference frequency; and a housing that houses the PRTC and packet master clock which may be plugged into a conventional small form factor (SFP) compliant cage to connect the packet master clock to a packet switched network (PSN).

Abstract: Methods, time consumer systems, and computer program products for maintaining accurate time on an ideal clock of a timing device are disclosed. The method includes receiving time information from a local clock, a reference clock, and one or more secondary clocks. The method further includes calculating frequencies for the local clock, the reference clock, and the one or more secondary clocks. The method further includes comparing the calculated frequencies of the reference clock to the calculated frequencies of the one or more secondary clocks. The method further includes detecting a holdover and/or a compromise situation based on the comparison. The method further includes syntonizing the ideal clock to one or more of the calculated frequencies.

Abstract: A time calibration method includes steps: establishing a connection between the electronic device and the communication device. A trigger signal is produced to the communication device in response to the operation of the user triggering the communication device to update the time of the communication device. The time provided by the electronic device is obtained and compared to the time provided by the communication device. The time of the electronic device is calibrated according to the updated time of the communication device if the difference between the time provided by the electronic device and the updated time provided by the communication device is greater than a predetermined value.

Abstract: In a clock synchronization system, clocks on a local area network are synchronized to a standard time signal such as the Network Time Protocol (NTP) signal or the Global Positioning System (GPS) time signal. A terminal on the network enables a user to introduce an offset to the clocks individually so that clocks can display the time in different time zones.

Abstract: A radio controlled timepiece includes: a radio wave receiving section which outputs a time code signal; an indicator display section which performs a display regarding a reception condition; a level change detecting section which detects a change of a signal level of the time code signal in a predetermined detection interval in a period of 1 second; an indicator control section which controls a content of the display based on a number of times that the change of the detected signal level appears; and an interval setting section which specifies the detection interval as a whole interval of the period of 1 second during a detecting process of a synchronization point in the time code signal every 1 second, and narrows the detection interval to be a certain interval within the period of 1 second after a detection of the synchronization point every 1 second.

Abstract: Systems and methods for calibrating real time clock are provided. A representative receiver includes a GPS device comprising a real time clock (RTC) circuitry that generates RTC clock signals and a temperature compensated crystal oscillator (TCXO) that generates TCXO clock signals. A ratio counter circuitry receives both the RTC clock signals and the TCXO clock signals and determines a frequency ratio by comparing the RTC clock signals and the TCXO clock signals. A computing device receives the frequency ratio and estimates a current RTC frequency based on the received frequency ratio. The computing device is configured to calibrate an estimated RTC time being maintained at the RTC circuitry based on an estimated RTC frequency from a prior estimation, the current RTC frequency and an elapsed time of the RTC circuitry.

Abstract: A system, method and computer program product for steering a time-of-day (TOD) clock for a computer system having a physical clock providing a time base for executing operations that is stepped to a common oscillator. The method includes receiving, at a processing unit, a request to change a clock steering rate used to control a TOD-clock offset value for the processing unit, the TOD-clock offset defined as a function of a start time (s), a base offset (b), and a steering rate (r). The unit schedules a next episode start time with which to update the TOD-clock offset value. After updating TOD-clock offset value (d) at the scheduled time, TOD-clock offset value is added to a physical-clock value (Tr) value to obtain a logical TOD-clock value (Tb), where the logical TOD-clock value is adjustable without adjusting a stepping rate of the oscillator.

Abstract: A clock device acquires time information representing present time from an external device at preset time intervals, corrects time of an internal clock based on the time information, calculates an error of the time of the internal clock based on the present time represented by the time information, and changes a first set value of the time interval based on the error. The changing updates the first set value to a second set value, which is m times the first set value when the error is smaller than a first threshold value, while updating the first set value to a second set value, which is n times the set value when the error is larger than a second threshold value larger than the first threshold value (m, n: positive values satisfying m>1, n<1 and m·n?1).

Abstract: Method and apparatus to implement a “virtual” real-time clock at a terminal based on time information from multiple communication systems. At least one system (e.g., GPS) provides “absolute” time information for the virtual real-time clock, and at least one other system (e.g., a cellular system) provides “relative” time information. The virtual real-time clock is “time-stamped” with absolute time as it becomes available from the first system. Relative time (which may be received from multiple asynchronous transmitters) is mapped to the timeline of the virtual real-time clock as it is received from the second system. Absolute time at any arbitrary time instant on the timeline may then be estimated based on the absolute time from the first system and the relative time from the second system. Absolute times from the first system for two or more time instants may also be used to calibrate the relative time from the second system.

Abstract: A real time clock circuit is provided that has an onboard oscillator continuously providing an internal clock frequency, which is digitally synchronized to a more accurate reference clock frequency. An exemplary real time clock inhibits synchronization of the internal clock frequency when the reference clock is unavailable or if the reference clock's frequency is outside of a defined accuracy range.

Abstract: A start date and an end date of a daylight saving time input by a user is stored in the daylight saving time information storage unit (41). The radio-controlled adjustment section (20) generates a time to adjust the time which the clocking unit (10) is clocking, by daylight saving time information and a standard time received via an antenna (AT) and a reception circuit (21), and adjusts the time of the clocking unit (10) by use of the generated time. Here, the daylight saving time determination unit (42) references to the daylight saving time period stored in the daylight saving time information storage unit (41), and adjusts the time of the clocking unit (10) so that the time becomes one which corresponds to the user-set daylight saving time.

Abstract: Calendar repair may be provided. Calendar events, such as appointments and meetings, may be created and copied to a plurality of attendee calendars. A first copy of the event may be compared to a second copy of the event, and an event property of the second event may be updated to match a corresponding event property of the first event.

Abstract: Methods and systems of extending battery life of remote battery-operated timekeeping devices by minimizing the number of required synchronizations per unit of time needed to maintain a predetermined accuracy of the devices. The number of synchronizations are minimized by first calculating a time error rate between the remote timekeeping device and a master device over a sample period. Then, a synchronization is delayed and the remote timekeeping device is compensated based on the time error rate. The compensation delays the need for a synchronization yet maintains the predetermined accuracy of the remote timekeeping device. In some embodiments, the remote timekeeping device is compensated and multiple synchronizations are delayed before a new synchronization is necessary to maintain the predetermined accuracy.

Abstract: A method for clock synchronization includes computing an offset value between a local clock time of a real-time clock circuit and a reference clock time, and loading the offset value into a register that is associated with the real-time clock circuit. The local clock time is then summed with the value in the register so as to give an adjusted value of the local clock time that is synchronized with the reference clock.