Abstract
The selection of the optimal number of poles (P) and zeros (Q) for parametric spectral analysis of closing sounds produced by lonescu-Shiley bioprosthetic aortic heart valves was evaluated in 15 patients. These values were obtained by computing the normalised root-mean-square error (NRMSE) function between the aortic closing sounds and the impulse response of the parametric models for different values of P and Q. As expected, the NRMSE function decreased with increasing value of P and Q. The optimal P and Q were selected at the beginning of the plateau of the NRMSE function. For all-pole modelling with autocorrelation and all-pole modelling with covariance, the optimal number of poles is 16. For pole-zero modelling using the Steiglitz-McBride method with maximum entropy and extrapolation to zero, the optimum values are 14 poles and 14 zeros.
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Abbreviations
- a k :
-
parameters describing the poles of the parametric model
- APA:
-
all-pole modelling with autocorrelation method
- APC:
-
all-pole modelling with covariance method
- A 2 :
-
aortic component of the second heart sound
- b r :
-
parameters describing the zeros of the parametric model
- E :
-
square error
- ms:
-
millisecond
- NRMSE:
-
normalised root-mean-square error
- P :
-
number of poles
- Q :
-
number of zeros
- SD:
-
standard deviation
- SMME:
-
Steiglitz-McBride method with maximum entropy (pole-zero modelling)
- SMEZ:
-
Steiglitz-McBride method with extrapolation to zero (pole-zero modelling)
- S/N:
-
signal-to-noise
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Cloutier, G., Guardo, R. & Durand, L.G. Spectral analysis of closing sounds produced by lonescu-Shiley bioprosthetic aortic heart valves. Med. Biol. Eng. Comput. 25, 487–491 (1987). https://doi.org/10.1007/BF02441739
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DOI: https://doi.org/10.1007/BF02441739