The reseach for the development of a automatical analytic system by digital analysis of lung sounds

通过听诊收集的信息，我们通常诊断肺部疾病，不太客观。审计结果和传递的信息量取决于审计人员。当我们判断疾病的变化情况时，听诊不是百分之百可靠的措施，因为它含糊不清，缺乏再现。为此，我们研制了一种声谱仪，利用时间扩展波形和快速傅立叶变换对肺音进行客观评价。首先，我们分析了咳嗽声是肺音的一部分。咳嗽分为非生产性咳嗽和生产性咳嗽，但没有一种标准的方法来测量和分析它们。对咳嗽的分析不仅可以为帮助诊断提供重要线索，还可以为选择治疗药物提供线索。在这项研究中，记录了慢性呼吸道疾病患者的咳嗽声，包括生产性咳嗽和非生产性咳嗽。然后将他们的咳嗽与健康受试者的自主咳嗽进行比较，并通过声音谱分析听力。所有来自病人和健康受试者的自主咳嗽声可以分为两个或三个阶段。此外，在第2和第3相的低频区观察到一些水平的长条纹。咳嗽声被认为是由气道壁受宠若惊或上呼吸道共振引起的。第二阶段的持续时间明显长于健康受试者的自主咳嗽和非生产性咳嗽。在声谱仪上，当连续的声音中断时，会出现竖线。这表明咳声是断断续续的。我们通过这项研究证实了咳嗽声音的特征。我国正在发展的声影仪对其他肺的进一步研究和肺音自动分析系统是不可避免的。

The informations collected through auscultations, which we usually diagnose pulmonary diseases, are less objective. The results and the transmitted volume of information are depend on the auditors. When we judge the changing condition of a disease, the auscultation is not hundred percent reliable measure because of its vague and lack of reappearance. So we developed a phonopeumograph using soundspectrograph, time-expanded waveform and fast fourier transformation to evaluate lung sounds objectively. Firstly, we analyzed cough sounds that are part of lung sounds.Coughs are divided into non-productive and productive coughs, but a standard method to measure and analyze them has not been established. The analysis of a cough may provide important clues not only to aid diagnosis, but also for selecting drugs for treatment. In this study, cough sounds, productive and non-productive coughs, were recorded from patients with chronic airway diseases. Then we compared their coughs with those of voluntary cough of healthy subjects and analyzed auditory by phononeumograph. All voluntary cough sounds from patients and healthy subjects could be separated into two or three phases. In addition, some horizontal long stripes were observed in the low-frequency area of phases 2 and 3. It is believed that cough sounds are produced by airway wall flattering or resonance of upper airway. The duration of phase 2 which shows productive cough of the patients is significantly longer than that of voluntary coughs of healthy subjects and non-productive coughs of patients. On the soundspectrograph, vertical lines appear when continuous sounds break off. It shows that productive cough sounds last discontinuously.We confirmed the characteristics of cough sounds by this study. It is inevitable to have further investigation on other lung and the automatic analyzing system of lung sounds by our developing phonopneumograph.