Surgery – Truss – Pad
Patent
1995-07-07
1997-04-29
Kamm, William E.
Surgery
Truss
Pad
A61B 504
Patent
active
056239351
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.
REFERENCES:
S.C. Tai, Slope-a real-time ECG data compressor, Medical & Biological Engineering And Computing, vol. 29, pp. 175-176, Mar. 1991.
Lin Jun, Full Use Of Memory for 12bit ADC data acquisition, Electronic Engineering, vol. 63, No. 780, London, p. 30, Dec. 1991.
G. Passariello et al., Arithmetic Coding for ECG Data Compression, Proceedings Of Computers In Cardiology IEEE Press New York, pp. 593-596, Sep. 23, 1991.
Peng-Wie Hsia, Ph.D., Electrocardiographic Data Compression Using Preceding Consecutive QRS Information, Proceedings Of Computers In Cardiology, IEEE Press New York US, pp. 465-468, Sep. 25, 1988, Washington, U.S.
P.J. Narramore, et al., Optimising Solid State Holter Systems, Proceedings of Computers In Cardiology, IEEE Press New York US, pp. 575-578, Sep. 25, 1988, Washington U.S.
ELA Medical S.A.
Kamm William E.
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