Transmission of Chosen Transform Coefficients of Normalized Cardiac Beats for Compression

Saha, S and Ramakrishnan, AG (1997) Transmission of Chosen Transform Coefficients of Normalized Cardiac Beats for Compression. In: 1997 IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP-97), Apr. 20-24, Munich, Germany, pp. 1901-1904.

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Abstract

A new technique for ECG compression is presented. Each delineated ECG beat is period normalized by mul-tirate processing and then amplitude normalized. Discrete Wavelet Transform (DWT), based on Daubechies-4 basis functions is applied on these normalized beats, after shifting each of them to the origin. The concatenation of ordered DWT coefficients of these beats is a near-cyclostationary signal. An algorithm is proposed to select a set of common positions of the significant coefficients to be retained from each beat. Linear Prediction is then applied to predict only these DWT coefficients of the current beat from the corresponding coefficients of a certain number of previous beats. Transmitting only the residuals of selected coefficients improves compression. A significant advantage of this technique is that the maximum reconstruction error in any cycle does not occur in the diagnostically crucial QRS region, while achieving a compression of about 15:1 and a normalized root mean square error of about 10%.

Item Type:	Conference Paper
Publisher:	IEEE
Additional Information:	©1997 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	25 Aug 2008
Last Modified:	19 Sep 2010 04:13
URI:	http://eprints.iisc.ac.in/id/eprint/519

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