V.V.Krizhanovskii The statistic estimation of acoustic parameters of human respiratory tract |
Acoustic bulletin, Vol. 1 ¹ 1, (1998) |
| statistical approach to solution of the problem of estimating the acoustic parameters of human respiratory tract has been considered. The estimation algorithms have been synthesized and analyzed in complicated conditions with noise, taking into account the presence of cardiac sounds. It has been shown that the noise created by cardiac sounds might be suppressed with the help of compensation channels formed with regard for the correlative noise characteristics in the frequency or time regions. The basic procedures of treatment of input signals and methods for obtaining data necessary for their realization have been determined. Potential efficiency of the algorithms was studied for a number of function models of spatial correlation of respiratory noise sources. It was noted that at great ratios signal/noise the dispersion estimate of the measured acoustic parameters is slightly sensitive to the change in the form of the function or spatial correlation of respiratory noise sources. Results of experimental investigations concerning the estimation of sound propagation rate in the parenchyma of the lungs are presented. It was shown that the developed algorithm ensures the formation of unbiased estimate of the sound velocity, being in good agreement with the known experimental data for the lungs parenchyma. |
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KEY WORDS: respiratory tract, cardiac sound interference, spatial correlation function, sound velocity in the parenchyma |
| TEXT LANGUAGE: Russian |