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

肺部疾病的诊断通常通过听诊获得的信息客观性较差。结果和信息传输量取决于审计员。在判断病情变化时，听诊因其模糊性和再现性差，并不是百分之百可靠的手段。因此，我们利用声谱仪、时间扩展波形和快速傅立叶变换开发了一种肺声图仪，以客观地评估肺音。首先，我们分析了作为肺音的一部分的咳嗽音。咳嗽分为非排痰性咳嗽和排痰性咳嗽，但尚未建立测量和分析它们的标准方法。对咳嗽的分析不仅可以为辅助诊断提供重要线索，而且可以为治疗选择药物。在这项研究中，咳嗽声音，生产性和非生产性咳嗽，记录了慢性气道疾病患者。并与正常人自主性咳嗽进行比较，同时进行声导图分析。所有患者和健康受试者的自主咳嗽声都可以分为两个或三个阶段。此外，在相2和相3的低频区观察到一些水平长条纹。咳嗽音的产生被认为是由于气道壁的平坦化或上气道的共振。显示患者排痰性咳嗽的阶段2的持续时间显著长于健康受试者的自主咳嗽和患者的非排痰性咳嗽的持续时间。在声谱仪上，当连续的声音中断时，就会出现垂直线。结果表明，排痰性咳嗽声持续时间不连续，证实了咳嗽声的特征。因此，我们研制的肺音图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.