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Temporal extension of heart sounds using synthetic spectrograms

Lopes, DM; Leung, TS; White, PR; (2000) Temporal extension of heart sounds using synthetic spectrograms. In: Enderle J.D,, (ed.) Annu Int Conf IEEE Eng Med Biol Proc. (pp. 970 - 973). : Chicago, IL.

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Type:Proceedings paper
Title:Temporal extension of heart sounds using synthetic spectrograms
Location:Inst. of Sound and Vibration Res., University of Southampton, Southampton, SO17 1BJ, United Kingdom
Additional information:Conference code: 58179 Export Date: 27 April 2010 Source: Scopus CODEN: CEMBA Language of Original Document: English Correspondence Address: Leung, T.S.; Inst. of Sound and Vibration Res., University of Southampton, Southampton, SO17 1BJ, United Kingdom; email: tsl@isvr.soton.ac.uk The short duration of each cardiac cycle can make diagnosis of presence and type of heart murmurs difficult. One approach is to replay the heart sound at a slower rate. Although conceptually simple, this approach alters both the temporal and spectral content of the sound. By working in Time-Frequency (TF) rather than the time domain, such temporal/spectral limitations can be avoided. This paper presents such a method, temporally extending the heart sound in the TF domain and reconstructing the signal using an algorithm based upon the Minimum Least Squares (MLS) inversion of the Short-Time Fourier Transform (ST-FT), a commonly used TF representation. An example signal has been processed in this manner, namely, the atrial septal defect (ASD) murmurs. The temporally extended heart sounds allow for better appreciation of various acoustic features such as murmurs and splittings in the second heart sound.
Keywords:Heart sounds, Phonocardiogram, Time-frequency analysis, Algorithms, Biomedical equipment, Diagnosis, Fourier transforms, Atrial septal defect, Heart sounds, Phonocardiogram, Short time Fourier transforms, Time frequency analysis, Cardiology
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Medical Physics and Bioengineering

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