Study on non-gaussian ARMA model and bispectrum of lung sounds

The ARMA model parameters of lung-thorax system from lung sound were estimated by the higher-order cumulants. Vesicular breath sounds, wheeze and stridors from the normal lung-thorax system mechanism and abnormal lung-thorax system mechanism were analyzed. Experimental results show that higher-order cummulants can reduce Gaussian noise and reflect the variation of the sound transfer function derived from abnormal lung-thorax system mechanism. It is important for automatic diagnosis of lung-thorax disease.