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On the analysis of the traditional envelope extraction method of anesthesia respiratory sound on Hilbert Transform, proposed the improvement extraction method of breathing sound signal envelope based on Hilbert Huang Transform (HHT). Using the parabola parameter spline interpolation method to fit the signal extremum points, after fitting the request signal is obtained by Empirical Mode Decomposition (EMD) from the curve, and then signal envelope is extracted by Hilbert Transform. Finally the obtained conclusion is compared with the traditional envelope extraction method of Hilbert Transform and the envelope extraction method of complex Morlet wavelet. The method can be used in the signal processing of operation breathing monitor, in order to be able to help doctors monitor the respiratory status of operation patient more accurately

Envelope Extraction of Anaesthesia Breathing Sound Signal on Hilbert Huang Transform