Gérard Charbonneau

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We simultaneously recorded tracheal sound and air flow from nine normal subjects (seven males and two females). Sound was picked up at the supra sternal notch with an air-coupled sensitive microphone held in a small airtight probe. Flow was measured at the mouth using a pneumotachograph Fleisch n degrees 2. Both sound and flow were directly digitized at a(More)
Respiratory sounds are composed of various events: normal and so-called adventitious sounds. These phenomena present a wide range of characteristics which make difficult their analysis with a single technique. Adapted time-frequency and time-scale techniques allow to fit best, under constraints, the accuracy of analysis of a time segmentation and, by the(More)
The flow rate curve takes different shapes during forced expirations performed by normal subjects. In some cases a wheeze may exist. In this study, we examine the conditions for appearance of a wheeze, before and after the peak flow, and the relationship between the wheeze and the shape of the flow rate curve. We analyzed ten parameters in 83 forced(More)
We recorded the lung sound and flow rate from six normal subjects (3 male and 3 female). Sound was picked up at the trachea with a sensitive microphone held in a small probe. Flow rate was measured at the mouth using a Fleisch No. 3 pneumotachograph. Subjects were made to breath for 15 s, with an increasing peak flow rate starting from apnoea to around 2(More)
We define here tonal melodies and spectral melodies: For sounds containing only octaves, the former correspond to fundamental frequency variations and the latter to spectral envelope variations. In this paper we give statistical results of judgements showing that tonal melodies are better perceived by the right ear. Conversely the left ear is more able to(More)
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