Sökning: "lung sound"

Hittade 4 avhandlingar innehållade orden lung sound.

  1. 1. Processing of the Phonocardiographic Signal : methods for the intelligent stethoscope

    Författare :Christer Ahlström; Per Ask; Leif Sörnmo; Linköpings universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Bioacoustics; phonocardiographic; signal processing; heart sound; lung sound; nonlinear dynamics; Medical technology; Medicinsk teknik;

    Sammanfattning : Phonocardiographic signals contain bioacoustic information reflecting the operation of the heart. Normally there are two heart sounds, and additional sounds indicate disease. If a third heart sound is present it could be a sign of heart failure whereas a murmur indicates defective valves or an orifice in the septal wall. LÄS MER

  3. 2. Nonlinear phonocardiographic Signal Processing

    Författare :Christer Ahlström; Per Ask; Anders Johansson; Peter Hult; Pablo Laguna; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Signal analysis methods; computerized cardiac auscultation system; phonocardiographic PCG signal; mitral insufficiency MI ; time- and cost-saving; Medical engineering; Medicinsk teknik;

    Sammanfattning : The aim of this thesis work has been to develop signal analysis methods for a computerized cardiac auscultation system, the intelligent stethoscope. In particular, the work focuses on classification and interpretation of features derived from the phonocardiographic (PCG) signal by using advanced signal processing techniques. LÄS MER

  4. 3. Electroglottographic analysis of phonatory dynamics and states

    Författare :Andreas Selamtzis; Sten Ternström; Malte Kob; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; voice function; phonation; vocal fold vibration; vocal registers; electroglottography;

    Sammanfattning : The human voice is a product of an intricate biophysical system. The complexity of this system enables a rich variety of possible sounds, but at the same time poses great challenges for quantitative voice analysis. For example, the vocal folds can vibrate in several different ways, leading to variations in the acoustic output. LÄS MER

  5. 4. Värdering och säkring av innemiljökvaliteter i byggnader: i program-, projekterings- och förvaltningsskede

    Författare :Marie Hult; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; assessment; indoor environment problems; assurance; indoor environment factors; parameters; building related health problems; questionnaire; performances; management; building process;

    Sammanfattning : This thesis presents and evaluate a methodology to assess and ensure Indoor Environment Qualities (IEQ) in buildings, during program, design and management phases. Different tools are proposed to collect input for assessment and to structure decision making in planning process. LÄS MER