[Lessard C,et al:IEEE Trans on BiomedEng,1985;33(4):461,(英文)]当病人处于检查或治疗中,呼吸状况是医生所关心的关键生理功能之一。呼吸音和严重呼吸病症之间的临床关系早在十九世纪就已通过听诊所确定.通常确认,呼吸音的特征与呼吸气流流速有关。此项研究的目的是为了确定在气管处测量到的呼吸音频率成分与通过呼吸速度计测到的气流流速 [Lessard C, et al: IEEE Trans on BiomedEng, 1985; 33 (4): 461, (English)] Breathing is one of the key physiological concerns of the physician when the patient is undergoing examination or treatment. The clinical relationship between respiratory sounds and severe respiratory disorders has been established through auscultation as early as the 19th century.It is generally confirmed that the characteristics of the breath sounds are related to the flowrate of the respiratory airflow. The purpose of this study was to determine the frequency components of the breath sounds measured at the trachea and the airflow rate measured by a respirometer