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US 2003/0171898 A1Published application
System and method for acquiring data
AssigneeIsis Innovation Limited
InventorsLionel Tarassenko, Neil William Townsend
Life of this patent
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AssigneeIsis Innovation Limited
InventorsLionel Tarassenko, Neil William Townsend
Estimating the term…
A system for acquiring, and displaying, data such as physiological data, from a plurality of data connection devices, each of which monitor one or more different parameters and output data at different sampling frequencies based on their own system clocks. The system receives the data signals at different sampling frequencies and associates each sample of each signal with a time stamp derived from a single master clock. Low rate and high rate data are treated differently. Low rate data is associated with the current value of the master clock, where as high rate data is time stamped by giving the first sample a time stamp equal to the current value of the current master clock, subsequent samples being given an estimated time stamp based on the expected interval between samples derived from the sampling frequency of the data collection device, and the timescale given to the first example. The estimated time stamp may be periodically corrected, and the estimation calculation can be improved by correcting the value used for the interval between samples. The different signals can be displayed together on a display aligned with respect to a time axis. The system can display, the data in two different timescales, one showing a few seconds of data and one showing a few hours of data. The data traces are scrolled across the time axis, new data being added to one end of the trace.
A system for acquiring data from a plurality of data collection devices each monitoring one or more parameters and outputting a data signal at a respective sampling frequency based on respective system clocks, the system comprising
A system according to any one of the preceding claims which is operable with data collection devices whose system clocks are free-running with respect to said master clock.
A system according to any one of the preceding claims further comprise a data storage device for storing the data samples and time stamps.
A system according to any one of the preceding claims wherein the signals are physiological signals.
A system according to any one of the preceding claims wherein the input means comprises interfaces for receiving signals from at least two of:
A system according to any one of the preceding claims wherein the displayed representations of the data signals are scrolled with respect to the time axis as the data signals are received.
A system for acquiring and displaying data from a plurality of data collection devices, the system being constructed and arranged to operate substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
A method of synchronising data signals from a plurality of data collection devices, each monitoring a parameter and outputting a data signal at a respective sampling frequency based on respective system clocks, the method comprising associating a time stamp derived from a master clock with each of the data signals.
Dependencies are inferred from the claim text.