System simulation and comparative analysis of foetal heart sound de-noising techniques for advanced phonocardiography

In health care centres, some precise and multifunctional ultrasound based systems are used for Foetal Heart Rate (FHR) monitoring. These monitors are invasive and cannot be used for prolonged home monitoring applications. In previous work, authors have developed a prototype FHR home monitoring system. The objective of this work is to present an effective de-noising technique for the phonocardiographic signal obtained from the prototype device. Various digital noise cancellation techniques are compared and analysed for their performance through Matlab simulation. The experimental results show that, adaptive filtering using Recursive Least Squares (RLS) algorithm is the most appropriate methodology for the foetal phonocardiographic signals de-noising implementation.

[1]  L. Senhadji,et al.  Time-frequency scaling transformation of the phonocardiogram based of the matching pursuit method , 1998, IEEE Transactions on Biomedical Engineering.

[2]  A. J. Zuckerwar,et al.  Development of a piezopolymer pressure sensor for a portable fetal heart rate monitor , 1993, IEEE Transactions on Biomedical Engineering.

[3]  P. Varady,et al.  Wavelet-based adaptive denoising of phonocardiographic records , 2001, 2001 Conference Proceedings of the 23rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society.

[4]  C L Lin,et al.  A portable monitor for fetal heart rate and uterine contraction. , 1997, IEEE engineering in medicine and biology magazine : the quarterly magazine of the Engineering in Medicine & Biology Society.

[5]  Ferenc Kovács,et al.  A rule-based phonocardiographic method for long-term fetal heart rate monitoring , 2000, IEEE Transactions on Biomedical Engineering.

[6]  M. Godinez,et al.  On-line fetal heart rate monitor by phonocardiography , 2003, Proceedings of the 25th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (IEEE Cat. No.03CH37439).

[7]  F. Kovacs,et al.  An improved phonocardiographic method for fetal heart rate monitoring , 1998, Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286).

[8]  Vivek Nigam,et al.  Fuzzy logic based variable step size algorithm for blind delayed source separation , 2006, Fuzzy Sets Syst..

[9]  H. Nazeran,et al.  Digital phonocardiography: a PDA-based approach , 2004, The 26th Annual International Conference of the IEEE Engineering in Medicine and Biology Society.

[10]  Vivek Nigam,et al.  A dynamic method to estimate the time split between the A2 and P2 components of the S2 heart sound , 2006, Physiological measurement.

[11]  M. Moghavvemi,et al.  Remote heart rate monitoring system based on electrocardiography , 2002, Student Conference on Research and Development.