Detection and processing techniques of FECG signal for fetal monitoring

Biological Procedures Online

Volumn 11, Issue 1, 2009, Pages 263-295

  Hasan, M A ^a   Reaz, M B I ^b   Ibrahimy, M I ^a   Hussain, M S ^a   Uddin, J ^a  

^a INTERNATIONAL ISLAMIC UNIVERSITY MALAYSIA   (Malaysia)

^b UNIVERSITI KEBANGSAAN MALAYSIA   (Malaysia)

Author keywords

ECG; FECG; FHR; FPGA; MECG; QRS complex

Indexed keywords

ACCURACY; ALGORITHM; AUSCULTATION; DOPPLER ECHOCARDIOGRAPHY; ELECTROSTIMULATION; FETUS ELECTROCARDIOGRAPHY; FETUS HEART RATE; HUMAN; MAGNETOCARDIOGRAPHY; MATHEMATICAL ANALYSIS; MATHEMATICAL MODEL; METHODOLOGY; MICROPROCESSOR; P WAVE; PERFORMANCE; PHONOCARDIOGRAPHY; QRS COMPLEX; REVIEW; SIGNAL DETECTION; SIGNAL NOISE RATIO; SIGNAL PROCESSING; SIGNAL TRANSDUCTION; T WAVE;

EID: 77649270701     PISSN: 14809222     EISSN: None     Source Type: Journal    
DOI: 10.1007/s12575-009-9006-z     Document Type: Review

References (97)

1. The American College of Obstetricians and Gynecologists (2001) Fetal heart rate monitoring during labor. http://www.acog.org/publications/patient- education/bp015.cfm.
2. Chen, P. (2004) Fetal heart monitoring. Department of Obstetrics & Gynecology, University of Pennsylvania Medical Center. http://pennhealth.com/ ency/article/003405.htm.
3. H. P. Van Geijn F. J. A. Copray 1996 A critical appraisal of fetal surveillance J Nurse Midwifery 41 64 64
4. J. A. Crowe J. M. Herbert X. B. Huang N. Reed, et al. 1995 Sequential recording of the abdominal fetal electrocardiogram and magnetocardiogram Physiol Meas 16 43 47 10.1088/0967-3334/16/1/005 1:STN:280:DyaK2M3mvVelsw%3D%3D 7749355
5. H. E. Bassil J. H. Dripps 1989 Real time processing and analysis of fetal phonocardiographic signals Clin Phys Physiol Meas 10 67 74 10.1088/0143-0815/ 10/4B/011 2630163 (Pubitemid 20047199)
6. Noguchi, Y., Mamune, H., Sugimoto, S., Yoshida, J., et al. (1994) Measurement characteristics of the ultrasound heart rate monitor. Engineering in medicine and biology society. Engineering advances. New opportunities for biomedical engineers. Proceedings of the 16th annual international conference of the IEEE. Baltimore, MD, USA. 1, 670-671.
7. E. C. Karvounis M. G. Tsipouras D. I. Fotiadis, et al. 2007 An automated methodology for fetal heart rate extraction from the abdominal electrocardiogram IEEE Trans Inf Technol Biomed 11 628 638 10.1109/TITB.2006.888698 18046938 (Pubitemid 350142408)
8. Ungureanu, M., Bergmans, J. W. M., Mischi, M., et al. (2005) Improved method for fetal heart rate monitoring. 27th annual international conference of the engineering in medicine and biology society, IEEE-EMBS, Shanghai, China, 5916-5919.
9. M. Y. Divon F. P. Torres S. Y. Yeh, et al. 1985 Autocorrelation techniques in fetal monitoring J Obstet Gynecol 1 151 151
10. G. W. Lawson R. Belcher G. S. Dawes, et al. 1983 A comparison of ultrasound (with autocorrelation) and direct electrocardiogram fetal heart rate detector systems Am J Obstet Gynecol 147 721 722 1:STN:280: DyaL2c%2FkvFKgtg%3D%3D 6638120
11. T. Fukushima C. A. Flores E. H. Hon, et al. 1985 Limitations of autocorrelation in fetal heart rate monitoring J Obstet Gynecol 153 685 692 1:STN:280:DyaL28%2FkvVSjsA%3D%3D
12. Najafabadi, F. S., Zahedi, E., Ali, M. A. M. (2005) A novel model for abdominal electrocardiography of a pregnant woman. Sensors and the international conference on new techniques in pharmaceutical and biomedical research 64-68. Kuala Lumpur, Malaysia.
13. P. P. Kanjilal S. Palit G. Saha 1997 Fetal ECG extraction from single-channel maternal ECG using singular value decomposition IEEE Trans Biomed Eng 44 51 59 10.1109/10.553712 1:STN:280:DyaK2szlslCmtQ%3D%3D 9214783 (Pubitemid 27014920)
14. T. Solum I. Ingemarsson A. Nygren 1980 The accuracy of abdominal ECG for fetal electronic monitoring J Perinat Med 8 142 149 10.1515/jpme.1980.8.3.142 1:STN:280:DyaL3M%2Fislyjtg%3D%3D 7420258 (Pubitemid 11235549)
15. P. Maria C. John P. Jean-Francois, et al. 2001 Monitoring the fetal heart non-invasively: a review of methods J Perinat Med 29 408 416 10.1515/JPM.2001.057 (Pubitemid 33608023)
16. V. Zarzoso A. K. Nandi 2001 Noninvasive fetal electrocardiogram extraction: blind separation versus adaptive noise cancellation IEEE Trans Biomed Eng 48 12 18 10.1109/10.900244 1:STN:280:DC%2BD3M7ntl2isQ%3D%3D 11235584 (Pubitemid 32165706)
17. Najafabadi, F. S., Zahedi, E., Ali, M. A. M. (2004) Fetal heart rate monitoring based on blind source separation. IFMBE proceedings of Kuala Lumpur International Conference on Biomedical Engineering. Kuala Lumpur, Malaysia 7, 141-144.
18. A. Khamene S. Negahdaripour 2000 A new method for the extraction of fetal ECG from the composite abdominal signal IEEE Trans Biomed Eng 47 507 516 10.1109/10.828150 1:STN:280:DC%2BD3c3is1GjtA%3D%3D 10763296 (Pubitemid 30187520)
19. K. R. Greene 1987 The ECG waveform Baillieres Clin Obstet Gynaecol 1 131 155 10.1016/S0950-3552(87)80027-5 1:STN:280:DyaL1c%2FivVSrsA%3D%3D 3311509
20. H. G. Murray 1986 The fetal electrocardiogram: current clinical developments in Nottingham J Perinat Med 14 399 404 10.1515/jpme.1986.14.6.399 1:STN:280:DyaL2s7ktVOjtQ%3D%3D 3820040
21. D. L. Kirk P. R. Smith 1986 Techniques for the routine on-line processing of the fetal electrocardiogram J Perinat Med 14 391 397 10.1515/jpme.1986.14.6. 391 1:STN:280:DyaL2s7ktVOjtA%3D%3D 3820039
22. H. Lilja K. Karlsson K. Lindecrantz, et al. 1989 Microprocessor based waveform analysis of the fetal electrocardiogram during labor Int J Gynaecol Obstet 30 109 116 10.1016/0020-7292(89)90304-4 1:STN:280:DyaK3c%2FjtlOhuw%3D%3D 2572480 (Pubitemid 19243949)
23. Reaz, M. B. I., Wei, L. S. (2004) Adaptive linear neural network filter for fetal ECG extraction. Proceedings of international conference on intelligent sensing and information processing. Chennai. India; 4-7 January 2004, p. 321-324.
24. Vasios, G., Prentza, A., Blana, D., et al. (2001) Classification of fetal heart rate tracings based on wavelet transform and self organizing map neural networks. 2001 proceedings of the 23rd annual EmBS international conference. Istanbul, Turkey; October 25-28 2001, p. 1633-1636.
25. Camps, G., Martinez, M., Soria, E. (2001) Fetal ECG extraction using an FIR neural network. Comput Cardiol 249-252. Rotterdam, Netherlands.
26. Kalam, A. K. A., Darus, Z. M., Ali, M. A. M. (1998) Development of a fuzzy rule-based QRS detection algorithm for fetal and maternal heart rate monitoring. Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society; 29 Oct-01 Nov 1998. vol. 1. p. 170-173.
27. Selvan, S., Srinivasan, R. (2000) A novel adaptive filtering technique for the processing of abdominal fetal electrocardiogram using neural network. Adaptive systems for signal processing, communications and control symposium 2000. Louise, Alta, Canada; p. 289-292.
28. Kam, A., Cohen, A. (1999) Detection of fetal ECG with IIR adaptive filtering and genetic algorithms. IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP'99) 4, 2335-2338. Phoenix, AZ, USA.
29. de Araujo, D., Barros, A. K., Baffa, O., et al. (2003) Fetal magnetocardiographic source separation using the poles of the autocorrelation function. Proceedings of the 4th international symposium on independent component analysis and blind signal separation, Nara, Japan, 1-4 April 2003, pp. 833-836.
30. Cichocki A., Amari S. (2002) Adaptive blind signal and image processing. Wiley, Hoboken.
31. G. Gennser B. W. Johansson S. Kullander 1968 Electrocardiographic and tissue lactate changes in the hypoxic human fetus in mid-pregnancy J Obstet Gynecol Br Commonw 75 941 948 1:STN:280:DyaF1M%2FhsFGqsw%3D%3D
32. Tal, Y., Akselrod, S. (1989) Fetal heart rate detection by a special transformation method. Proceedings of Computers in Cardiology 275-278, Jerusalem, Israel.
33. J. E. A. Sheild D. L. Kirk 1981 The use of digital filters in enhancing the fetal electrocardiogram J Biomed Eng 3 44 48 10.1016/0141-5425(81)90104-7 1:STN:280:DyaL3M7itVyluw%3D%3D 7464091 (Pubitemid 11208136)
34. E. H. Hon S. T. Lee 1963 Noise reduction in fetal electrocardiography. II. Averaging Techniques Am J Obstet Gynecol 87 1086 1096 1:STN:280: DyaF2c%2Fks12rsA%3D%3D 14089313
35. Charles, B. (1996) An enhanced signal processing strategy for fetal heart rate detection. Master Thesis. Old Dominion University.
36. Zhou, Z. (1995) Fetal heart rate detection with a passive acoustic sensor system. Master Thesis. Old Dominion University.
37. Pretlow, R. A. (1992) Signal processing methodologies for an acoustic fetal heart rate monitor. Old Dominion University Research Foundation.
38. Kaiser, J. F. (1990) On a simple algorithm to calculate the energy of a signal. International Conference Acoustics, Speech, and Signal Processing ICASSP 1, 381-384. Albuquerque, NM, USA.
39. Symmonds E. M., Sahota D., Chang A. (2001) Fetal electrocardiography. Imperial College Press, London.
40. M. Martinez E. Soria J. Calpe, et al. 1997 Application of the adaptive impulse correlated filter for recovering fetal electrocardiogram Comput Cardiol 24 9 12
41. G. Camps-Valls M. Martinez-Sober E. Soria-Olivas, et al. 2004 Foetal ECG recovery using dynamic neural networks Artif Intell Med 31 197 209 15302086
42. V. Zarzoso A. K. Nandi E. Bacharakis 1997 Maternal and foetal ECG separation using blind source separation methods IMA J Math Appl Med Biol 14 207 225 10.1093/imammb/14.3.207 1:STN:280:DyaK2svltFOmtg%3D%3D 9306675
43. Vrins, F., Jutten, C., Verleysen, M. (2004) Sensor array and electrode selection for non-invasive fetal electrocardiogram extraction by independent component analysis. Proceedings 5th International Conference. Granada, Spain; 22-24 September 2004. p. 1017-1024.
44. Golbach EGM, Stinstra JG, Grot P, et al. Reference values for fetal MCG/ECG recordings in uncomplicated pregnancies. Proceedings 12th International Conference on Biomagnetism. Espoo. Finland; 13-17 August 2000. p. 595-598.
45. F. Rochard B. S. Schifrin F. Goupil, et al. 1996 Nonstressed fetal heart rate monitoring in the antepartum period Am J Obstet Gynecol 174 1644 10.1016/S0002-9378(96)70633-6
46. E. H. Hon S. T. Lee 1963 The fetal electrocardiogram Am J Obstet Gynecol 87 804 813 1:STN:280:DyaF2c%2FktlCnsQ%3D%3D 14085783
47. V. T. Rhyne 1969 A digital system for enhancing the fetal electrocardiogram IEEE Trans Biomed Eng 16 80 86 10.1109/TBME.1969.4502608 1:STN:280:DyaF1M7ktFajtA%3D%3D 5775612
48. J. H. Van Bemmel L. Peeters S. J. Hengeveld 1968 Influence of the maternal ECG on the abdominal fetal ECG complex Am J Obstet Gynecol 102 556 562 1:STN:280:DyaF1M%2FivVyqsg%3D%3D 5687491
49. A. G. Favret A. A. Marchetti 1966 Fetal electrocardiographic wave forms from abdominal-wall recordings Obstet Gynecol 27 355 362 1:STN:280: DyaF287gvFKluw%3D%3D 5909554
50. J. H. Nagel 1966 Progress in fetal monitoring by improved data acquisition IEEE Trans Biomed Eng BME-13 4 175 182 10.1109/TBME.1966.4502434
51. J. W. Stoughton G. N. Weber R. A. Pretlow 1990 Fetal heart rate estimation via adaptive least mean square linear prediction methods Proc IEEE Southeastcon '90 1 260 264 10.1109/SECON.1990.117812
52. Lai, K. C., Shynk, J. J. (2000) A signal separation algorithm for fetal heart-rate estimation. Signals, Systems and Computers Conference Record of the Thirty-fourth Asilomar. 1, 348-351.
53. Peters, C., Vullings, R., Bergmans, J., et al. (2006) Heart rate detection in low amplitude non-invasive fetal ECG recordings. 28th Annual International Conference of the IEEE EMBS. New York. USA; 30 Aug-3 Sept 2006. p. 6092-6094.
54. Martinez, M., Soria, E., Calpe, J., et al. (1997) Application of the adaptive impulse correlated filter for recovering fetal electrocardiogram. Comput Cardiol 9-12, Lund, Sweden.
55. Echeverria, J. C., Ramirez, N., Pimentel, A. B., et al. (1996) Fetal QRS extraction based on wavelet analysis and pattern matching. Engineering in medicine and biology society. Bridging disciplines for biomedicine. Proceedings of the 18th Annual International Conference of the IEEE. Amsterdam. Netherlands; 31 October-3 November 1996. vol. 4. p. 1656-1657.
56. P. Bergveld J. K. Arjan J. H. J. Peuscher 1986 Real-time fetal ECG Recording IEEE Trans Biomed Eng BME-33 505 509 10.1109/TBME.1986.325737
57. S. G. Mallat 1989 A theory for multiresolution signal decomposition: the wavelet representation IEEE Trans Pattern Anal Mach Intell 1 674 693 10.1109/34.192463
58. S. Abboud D. Sadeh 1989 Spectral analysis of the fetal electrocardiogram Comput Biol Med 19 409 415 10.1016/0010-4825(89)90076-0 1:STN:280: DyaK3c7mvVartQ%3D%3D 2625039 (Pubitemid 20111395)
59. Datian, Y., Xuemei, O. (1996) Application of wavelet analysis in detection of fetal ECG. Engineering in Medicine and Biology Society. Bridging Disciplines for Biomedicine. Proceedings of the 18th Annual International Conference of the IEEE. Amsterdam. Netherlands; 31 October-3 November 1996. vol. 3. p. 1043-1044.
60. S. Mallat W. L. Hwang 1992 Singularity detection and processing with wavelets IEEE Trans Inf Theory 38 617 643 10.1109/18.119727
61. Papadimitriou, S., Gatzounas, D., Papadopoulos, V., et al. (1996) Fetal heart rate signal denoising by processing the wavelet transform modulus maxima. Engineering in Medicine and Biology Society, Bridging Disciplines for Biomedicine. Proceedings of the 18th Annual International Conference of the IEEE. Amsterdam. Netherlands; 31 October-3 November 1996. vol. 3. p. 1029-1030.
62. F. Mochimaru Y. Fujimoto 2002 Detecting the fetal electrocardiogram by wavelet theory-based methods Prog Biomed Res 7 185 193
63. Karvounis, E. C., Papaloukas, C., Fotiadis, D. I., et al. (2004) Fetal heart rate extraction from composite maternal ECG using complex continuous wavelet transforms. Comput Cardiol 737-740. Chicago, IL, USA.
64. Song, Y., Xie, W., Chen, J. F., et al. (2006) Passive acoustic maternal abdominal fetal heart rate monitoring using wavelet transform. Comput Cardiol 581-584, Valencia, Spain.
65. Karvounis. E. C., Tsipouras, M. G., Fotiadis, D. I., et al. (2006) A method for fetal heart rate extraction based on time-frequency analysis. 19th IEEE Symposium on Computer-Based Medical Systems (CBMS'06). Salt Lake City, UT, USA; 22-23 June 2006. p. 347-347.
66. Liszka-Hackzell, J. (1994) Categorization of fetal heart rate patterns using neural networks. Comput Cardiol 97-100. Bethesda, Maryland, USA.
67. Marques de Sa, J. P., Reis, L. P., Lau, J. N. et al. (1994) Estimation and classification of fetal heart rate baselines using artificial neural networks. Comput Cardiol 541-544. Bethesda, Maryland, USA.
68. Magenes. G., Signorini, M. G., Arduini, D. (1999) Detection of normal and pathological fetal states by means of neural and fuzzy classifiers applied to CTG parameters. Engineering in Medicine and Biology. 21st Annual Conference and the 1999 Annual Fall Meeting of the Biomedical Engineering Soc. BMES/EMBS Conference. Atlanta, GA, USA; 13-16 October 1999. vol. 2. p. 936-936.
69. B. Widrow J. R. Glover Jr J. M. McCool, et al. 1975 Adaptive noise canceling: principles and applications Proc IEEE 63 1692 1716 10.1109/PROC.1975.10036
70. Warrick, P., Hamilton, E., Macieszczak, M. (2005) Neural network based detection of fetal heart rate patterns. Proceedings of International Joint Conference on Neural Networks. Montreal. Canada; 31 July-4 August 2005. vol. 4. p. 2400-2405.
71. L. Lieven de M. Bart de V. Joos 2000 Fetal electrocardiogram extraction by blind source subspace separation IEEE Trans Biomed Eng 47 567 572 10.1109/10.841326 (Pubitemid 30316973)
72. A. K. Barros A. Cichocki 2001 Extraction of specific signals with temporal structure Neural Comput 13 1995 2003 10.1162/089976601750399272 1:STN:280:DC%2BD3MvntFKlug%3D%3D 11516354 (Pubitemid 33595039)
73. Marossero, D. E., Erdogmus, D., Euliano, N., et al. (2003) Independent components analysis for fetal electrocardiogram extraction: a case for the data efficient mermaid algorithm. Neural Networks for Signal Processing (NNSP'03). IEEE 13th Workshop. Toulouse, France; 17-19 September 2003. p. 399-408.
74. K. E. Hild II D. E. Erdogmus J. Principe 2001 Blind source separation using Renyi's mutual information IEEE Signal Process Lett 8 174 176 10.1109/97.923043 (Pubitemid 32498951)
75. Ping, G., Ee-Chien, C., Wyse, L. (2003) Blind separation of fetal ECG from single mixture using SVD and ICA. 4th International Conference on Information, Communications & Signal Processing and 4th Pacific-Rim Conference on Multimedia (ICICS-PCM 2003). Singapore; 15-18 December 2003. vol. 3. p. 1418-1422.
76. Vigneron, V., Paraschiv-Ionescu, A., Azancot, A., et al. (2003) Fetal electrocardiogram extraction based on non-stationary ICA and wavelet denoising, proceedings. 7th International Symposium on Signal Processing and Its Applications. Paris, France. 1-4 July 2003. vol. 2. p. 69-72.
77. Vrins, F., Vigneron, V., Jutten, C., et al. (2004) Abdominal electrodes analysis by statistical processing for fetal electrocardiogram extraction. Proceedings of the 2nd International Conference Biomedical Engineering. Innsbruck, Austria; 16-18 February 2004. p. 244-229.
78. Burghoff, M., Van Leeuwen, P. (2004) Separation of fetal and maternal magnetocardiographic signals in twin pregnancy using independent component analysis (ICA). Neurol Clin Neurophysiol 1-4.
79. Chareonsak, C., Farook, S., Yu, W., et al. (2004) Design of FPGA hardware for a real-time blind source separation of fetal ECG signals, Biomedical Circuits and Systems. 2004 IEEE International Workshop on Biomedical Circuits and Systems. Singapore; 1-3 December 2004. p. 13-16.
80. Lee, J., Park, K. L., Lee, K. J. (2005) A new over-determined BSS based algorithm for a single channel wearable fetal heart rate monitoring system. Proceedings of the Conference the Japan Society of Medical Electronics & Biomedical Engineering. Japan; 2005. vol. 44. p. 685-686.
81. Widrow B., Stearns S. (1985) Adaptive signal processing. Prentice-Hall, Upper Saddle River.
82. Horner, S., Holls, W., Crilly, P. B. (1992) Non-invasive fetal electrocardiograph enhancement. Proceedings of Computers in Cardiology 163-166. Durham, NC, USA.
83. F. Magalhaes J. P. Marques de Sa J. Bernardes, et al. 2006 Characterization of fetal heart rate irregularity using approximate entropy and wavelet filtering Comput Cardiol 33 933-996
84. Georgoulas, G. G., Stylios, C. D., Nokas, G., et al. (2004) Classification of fetal heart rate during labour using hidden Markov models. Proceedings 2004 IEEE International Joint Conference on Neural Networks (IJCNN'2004). Budapest, Hungary; 25-29 July 2004. vol. 3. p. 2471-2475.
85. Vasios, G., Prentza, A., Hintipas, E., et al. (2003) Investigating the effect of oxygen saturation on very low frequency periodic components of the fetal heart rate during labor using matching pursuits. Proceedings of the 25th Annual International Conference of the IEEE in Engineering in Medicine and Biology Society. Cancun. Mexico; 17-21 September 2003. vol. 3. pp. 2566- 2569.
86. K. C. Laim J. J. Shynk 2002 A successive cancellation algorithm for fetal heart-rate estimation using an intrauterine ECG signal IEEE Trans Biomed Eng 49 943 954 10.1109/TBME.2002.802010 (Pubitemid 34925463)
87. Kezi Selva Vijila, C., Kanagasabapathy, P., Johnson, S. (2005) Adaptive neuro fuzzy inference system for extraction of FECG. Proceedings of IEEE India Annual Conference (INDICON 2005). Chennai, India; 11-13 December 2005. p. 224-227.
88. J. Vanderschoot D. Callaerts W. Sansen, et al. 1987 Two methods for optimal MECG elimination and FECG detection from skin electrode signals IEEE Trans Biomed Eng 34 233 243 10.1109/TBME.1987.325949 1:STN:280: DyaL2s7pt1OktA%3D%3D 3570313
89. D. Callaerts B. De Moor J. Vandewalle, et al. 1990 Comparison of SVD methods to extract the foetal electrocardiogram from coetaneous electrode Med Biol Eng Comput 28 217 224 10.1007/BF02442670 1:STN:280:DyaK3czjtFGgtw%3D%3D 2377003 (Pubitemid 20278191)
90. Kam, A., Cohen, A. (1998) Maternal ECG elimination and foetal ECG detection comparison of several algorithms. Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Hong Kong SAR, China; October 29-November 1. 1998. vol. 20. p. 174-177.
91. Mooney, D. M., Grooome, L. J., Bentz, L. S., et al. (1995) Computer algorithm for adaptive extraction of fetal cardiac electrical signal. Proceedings of the 1995 ACM Symposium on Applied Computing. Nashville, Tennessee, USA; 26-28 February 1995. pp. 113-117.
92. Azad, K. A. K. (2000) Fetal QRS complex detection from abdominal ECG: a fuzzy approach. Proceedings of IEEE Nordic Signal Processing Symposium. Kolmarden, Sweden; 2000. p. 275-278.
93. J. F. Pieri J. A. Crowe B. R. Hayes-Gill, et al. 2001 Compact long-term recorder for the transabdominal foetal and maternal electrocardiogram Med Biol Eng Comput 39 118 125 10.1007/BF02345275 1:STN:280:DC%2BD3M7jsVymsg%3D%3D 11214263
94. M. I. Ibrahimy A. F. Ismial M. A. M. Ali, et al. 2003 Real-time signal processing for fetal heart rate monitoring IEEE Trans Biomed Eng 50 258 261 10.1109/TBME.2002.807642 12665042 (Pubitemid 36330926)
95. W. C. Lin C. H. Feng M. R. Neuman 1977 A microprocessor-based data acquisition and processing system for studying the kinematics of labor Proc IEEE 65 722 729 10.1109/PROC.1977.10553
96. Pimentel, B. S., de Avila Valgas Filho, J. H., Campos, R. L., et al. (2001) A FPGA implementation of a DCT-based digital electrocardiographic signal compression device. 14th symposium integrated circuits and systems design. Pirenopolis. Brazil; 10-15 September 2001. p. 44-49.
97. Charoensak, C., Sattar, F. (2005) Design of low-cost FPGA hardware for real-time ICA-based blind source separation algorithm. EURASIP Journal on Applied Signal Processing 3076-3086.