DocumentCode :
3453700
Title :
Frequency tracking of resonant-like sounds from audio recordings of arterio-venous fistula stenosis
Author :
Obando, Pablo Vasquez ; Obando, Pablo Vasquez ; Mandersson, Bengt
Author_Institution :
Faculty of Electrical Engineering, National University of Engineering, Managua, Nicaragua
fYear :
2012
fDate :
4-7 Oct. 2012
Firstpage :
771
Lastpage :
773
Abstract :
In this work we study in time-frequency domain what has been termed "tea-kettle" sounds found in audio recordings of arteriovenous fistulas with severe stenosis. These sounds appears as frequency modulated signals (chirps) in the time-frequency plots. We first developed a simple model for generating synthetic bruits containing chirps. Then we performed tracking of the time-varying frequency signals using an Extended Kaiman filter (EKF). Finally we analyzed a data base of recordings from 5 patients suffering from venous stenosis EKF frequency tracker, the results shows the chirps mean frequencies (fundamental) can vary in a rather wide range of frequencies from about 200 Hz to 600 Hz and that up to two harmonics can also be found in the considered cases.
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Bioinformatics and Biomedicine Workshops (BIBMW), 2012 IEEE International Conference on
Conference_Location :
Philadelphia, USA
Print_ISBN :
978-1-4673-2746-6
Electronic_ISBN :
978-1-4673-2744-2
Type :
conf
DOI :
10.1109/BIBMW.2012.6470237
Filename :
6470237
Link To Document :
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