Filter and method for filtering baseline wander

Details Filter and method for filtering baseline wander Filter and method for filtering baseline wander

1991-09-09

1993-12-14

Kamm, William E.

Surgery

Truss

Pad

A61B 50428

Patent

active

052693139

ABSTRACT:
A linear phase high pass filter having a linear phase low pass filter in parallel with an electronic delay means is disclosed to remove baseline wander from an ECG signal. The linear phase low pass filter is preferably a digital Infinite Impulse Response (IIR) filter. An input ECG signal is simultaneously presented to an IIR low pass filter and an electronic delay. The low pass filter passes the low frequency baseline signal while blocking the ECG signal comprised of higher frequency components than the cutoff frequency of the low pass filter. Thereafter, the outputs from the IIR low pass filter and delay are passed to a summer that subtracts the output of the low pass filter from the output of the delay to produce the output of the filter. The combination of the output of a low pass filter being subtracted from a delayed input signal produces a high pass filter. The resulting high pass filter has a -0.3 dB cutoff frequency of about 0.5 Hertz while providing a virtually constant group delay for the ECG signal passed through the filter.

REFERENCES:
patent: 3569852 (1971-03-01), Berkovits
patent: 3822696 (1974-07-01), Ekstrom et al.
patent: 3923041 (1975-12-01), Stasz et al.
patent: 4170227 (1979-10-01), Feldman et al.
patent: 4192318 (1980-03-01), Dam et al.
patent: 4458691 (1984-07-01), Netravali
patent: 4458692 (1984-07-01), Simson
patent: 4492235 (1985-01-01), Sitrick
patent: 4537201 (1985-08-01), Delle-Vedove et al.
patent: 4563704 (1986-01-01), Hirota
patent: 4658831 (1987-04-01), Reinhard et al.
patent: 4664116 (1987-05-01), Shaya et al.
patent: 4793361 (1988-12-01), DuFault
patent: 4802491 (1989-02-01), Cohen et al.
patent: 4812976 (1989-03-01), Lundy
patent: 4908579 (1990-03-01), Tawfik et al.
patent: 4914398 (1990-04-01), Jove et al.
patent: 4931743 (1990-06-01), Fukuda et al.
patent: 4947858 (1990-08-01), Smith
patent: 5025794 (1991-06-01), Albert et al.
patent: 5107849 (1992-04-01), Bellin et al.
Taylor et al., "Medical & Biological Engineering", Jul., 1974, vol. 12, No. 4, pp. 493-502.
Kirber et al., "Proceedings of the 10th Annal Northwest", Bioengineering Conference, Hanover, N.H., Mar. 15-16, 1982, pp. 217-221.
"A Filter to Suppress ECG Baseline Wander and Pressure ST-Segment Accuracy in a Real-time Environment" by Roddy A. Frankel, Eric W. Pottala, Richard W. Bowser, and James J. Bailey, October issue of Journal of Electrocardiology, pp. 316 through 317.
"Digital Filters for ECG Signals" by David W. Mortara, 1977 Computers in Cardiology Proceedings, pp. 512 through 514.
"ECG Baseline Wander Reduction Using Linear Phase Filters" by J. A. van Alste et al., published in Computers and Biomedical Research, 19, 417-427 (1986).
"Electrocardiogram Baseline Noise Estimation and Removal Using Cubic Splines and State-Space Computation Techniques" by C. R. Myer and H. N. Keiser, published in Computers and Biomedical Research, 10, 459, 4-470 (1977).
IRE Transactions on Circuit Therory, vol. 18, No. 6, Nov. 1971, New York, US, pp. 659-664, Thiran, "Recursive Digital Filters with Maximally Flat Group Delay".

Affiliated with

Also associated with

Rating

Filter and method for filtering baseline wander does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Filter and method for filtering baseline wander, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Filter and method for filtering baseline wander will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1697590