Data compression methods and apparatus for use with physiological data
First Claim
1. A process for physiological data compression, comprising the steps of:
- a) acquiring an electrical signal having an amplitude variation representative of the physiological data to be compressed during a given time period;
b) sampling the acquired electrical signal amplitude at a predetermined frequency;
c) processing the sampled signals by;
i) determining a first derivative of a current sampled signal;
ii) determining a second derivative of the current sampled signal;
iii) performing a predictive analysis of the current sampled signal amplitude as a function of a plurality of values of the first and second derivatives;
iv) selecting a coding mode from among at least two coding modes as a function of the predictive analysis to optimize a global volume of a memory in which to store compressed physiological data for the given time period, said coding modes being dynamically switchable from one mode to another mode; and
d) compressing the sampled signal by implementing the selected coding mode.
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Abstract
A process of physiological data compression, notably cardiac activity, especially for a recording of an electrocardiogram or a Holter electrogram. This process is characterized by the following successive operations: (a) acquisition of data by collection of an electrical signal and sampling of this signal at a given frequency; (b) determination of the first derivative of the sampled signal; (c) determination of the second derivative of the sampled signal; (d) analyze predictively the sampled signal according to a plurality of values of first and second derivatives and selection, for the current sample, of a mode of coding from among a plurality of predetermined coding modes which are commutable dynamically, in a manner to optimize the global code volume created for coding the aforementioned plurality of future values; and (e) compression of data by the implementation of the coding mode chosen at stage (d). Decompression occurs by the inverse of the compression mode of coding. An apparatus for performing the compression in a Holter recording device is described.
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Citations
22 Claims
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1. A process for physiological data compression, comprising the steps of:
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a) acquiring an electrical signal having an amplitude variation representative of the physiological data to be compressed during a given time period; b) sampling the acquired electrical signal amplitude at a predetermined frequency; c) processing the sampled signals by; i) determining a first derivative of a current sampled signal; ii) determining a second derivative of the current sampled signal; iii) performing a predictive analysis of the current sampled signal amplitude as a function of a plurality of values of the first and second derivatives; iv) selecting a coding mode from among at least two coding modes as a function of the predictive analysis to optimize a global volume of a memory in which to store compressed physiological data for the given time period, said coding modes being dynamically switchable from one mode to another mode; and d) compressing the sampled signal by implementing the selected coding mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification