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Method for adjusting clocks of multiple data processors to a common time base
| Details |
Inventors: Potash, Richard J.; Burns, Steven K.;
Assignee: Computer Sports Medicine, Inc. (Cambridge, MA)
Primary Examiner: Griffin; Robert L.
Assistant Examiner: Huseman; Marianne
Attorney, Agent or Firm: Lessler; Arthur L.
A master clock is situated at a central data gathering station, and slave clocks are situated at one or more (functionally or spatially) remote stations. Time signals are exchanged between the master clock at the central station and each slave clock at the corresponding remote station. From these signals (i) the transmission time between the central station and the corresponding remote station is determined, and (ii) the ratio between the frequencies of the central station master clock and the corresponding remote station slave clock is determined. The transmission time and clock ratio so determined are averaged between successive determinations to provide improved accuracy. The transmission time value is used to set the slave clock to a reference value accurately corresponding to the time kept by the master clock; and thereafter the clock ratio value is used to insure that the slave clock is incremented at a rate corresponding to the frequency of the oscillator in the master clock. If desired, the master clock can be synchronized to a reference time which is the average of the reference times of the various clocks, and/or to a frequency which is the average of the frequencies of the oscillators in the various clocks. |
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DETAILED DESCRIPTION As herein described, according to one aspect of the invention, there is provided a method for synchronizing the frequency of a slave clock to that of a master clock, wherein the master clock provides a master clock time signal and the slave clock provides a slave clock time signal.
The slave clock time signal frequency and reference time values can be set independently.
A time interval commencement signal is transmitted from the master clock to the slave clock.
The time interval commencement signal has a value corresponding to the value of the master clock time signal when the time interval commencement signal is transmitted.
A time interval termination signal is subsequently transmitted from the master clock to the slave clock.
The time interval termination signal has a value corresponding to the value of the master clock time signal when the time interval termination signal is transmitted.
After receipt of the time interval termination signal at the slave clock, the ratio k.
sub.
clkratio of the two clock frequencies is computed as the ratio of (i) the difference between the values of the time interval commencement and time interval termination signals to (ii) the elapsed time between reception of the time interval commencement and time interval termination signals as determined by the slave clock.
An adjusted slave clock time signal is then generated at the slave clock, the adjusted slave clock time signal having a value which increases with time by an amount proportional to the product of the number of periodic slave clock time increment signals with k.
sub.
clkratio.
According to another aspect of the present invention there is provided a method for synchronizing the reference time of at least one slave clock to that of a master clock.
The master clock provides a master clock time signal and the slave clock provides a slave clock time signal and periodic slave clock time increment signals.
According to this aspect of the invention, a first reference time signal is transmitted from the slave clock to the master clock, said signal having a value corresponding to the value of the slave clock time signal when the first reference time signal is transmitted
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