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Optimal time-window duration for computing time/frequency representations of normal phonocardiograms in dogs

  • Computing and Data Processing
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Abstract

The optimal duration of the time-window used to compute the time-frequency representation (spectrogram) of the phonocardiogram was studied in four dogs by using intracardiac and thoracic measurements of the PCG. The power and cross-spectrograms of the intracardiac and thoracic PCGs were computed using a fast Fourier transform algorithm and a sine-cosine window with 10 per cent decaying functions. A coherence spectrogram was also computed for each dog to study the linear relationship between the two signals and determine the optimal time-window duration. Results show that the optimal range of the time-window duration is between 16 and 32 ms. A time-window shorter than 16ms spreads out low-frequency components into the higher frequencies and generates a spectrographic representation with poor frequency resolution (≥62·5 Hz). A window larger than 32 ms increases the frequency resolution but smears the spectrographic representation of the signal in the time domain and thus cannot correctly reflect the time-varying properties of the signal. In both cases, the amplitude of the coherence function computed between the left ventricular and the thoracic phonocardiograms is overestimated.

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Authors and Affiliations

  1. Laboratory of Biomedical Engineering, Clinical Research Institute of Montreal, University of Montreal, 110 West Pine Avenue, H2W 1R7, Montreal, Quebec, Canada

    G. Jamous, L. -G. Durand & Y. -E. Langlois

  2. Hôtel-Dieu de Montréal Hospital, 3840 rue St-Urbain, H2W 1T8, Montreal, Quebec, Canada

    Y. -E. Langlois & S. Carioto

  3. Department of Medicine, Faculty of Veterinary Medicine, University of Montreal, 3200 Sicotte Street, J2S 7C6, St-Hyachinthe, Quebec, Canada

    T. Lanthier & P. Pibarot

Authors
  1. G. Jamous
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  2. L. -G. Durand
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  3. Y. -E. Langlois
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  4. T. Lanthier
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  5. P. Pibarot
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  6. S. Carioto
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Jamous, G., Durand, L.G., Langlois, Y.E. et al. Optimal time-window duration for computing time/frequency representations of normal phonocardiograms in dogs. Med. Biol. Eng. Comput. 30, 503–508 (1992). https://doi.org/10.1007/BF02457829

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  • DOI: https://doi.org/10.1007/BF02457829

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