A cepstral method for analysis of acoustic transmission characteristics of respiratory system

The generation and transmission process of transmitted sound signals (TSS) is analyzed and a mathematical model of TSS is established here. The power cepstral characteristics of TSS are studied based on the mathematical model and a new analysis method of acoustic transmission of respiratory system using a homomorphic processing technique is proposed. The experimental results show that the normal respiratory system has only one formant, while the abnormal respiratory system presenting lung consolidation has two formants and the second formant plays important role in that system. This new method is a simple and effective one.