Many researchers have worked on modeling the respiratory system both from merely scientific point of interest to understand how a biological system works and also for its plausible application for diagnostic purposes. The respiratory system also has a nonrespiratory function, which is vocalization. The sound generation of vocalization and that of respiration have similarities and also substantial differences. However, the vocal system has well-established models and theories while the respiratory sound generation and transmission is one of the controversial issues in respiratory acoustics due to its complexity. Since most of the respiratory sound transmission models are extensions of the acoustic model of the vocal tract (the part of the respiratory system between the glottis and the mouth/nasal cavity), in this book we start with describing a simple electrical T-circuit model to describe vocal tract acoustic properties for sound generation and transmission.
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