| Full text | |
| Author(s): |
Delfini, A. T.
;
Troncon, L. E. A.
;
Baffa, O.
;
Oliveira, R. B.
;
Moraes, E. R.
;
Dossel, O
;
Schlegel, WC
Total Authors: 7
|
| Document type: | Journal article |
| Source: | WORLD CONGRESS ON MEDICAL PHYSICS AND BIOMEDICAL ENGINEERING, VOL 25, PT 4: IMAGE PROCESSING, BIOSIGNAL PROCESSING, MODELLING AND SIMULATION, BIOMECHANICS; v. 25, p. 3-pg., 2010-01-01. |
| Abstract | |
A system of digital acquisition and recording of sound was developed and a method for analysis was implemented. The system is based on six electrets microphones, whose signals were amplified by a simple two-staged operational amplifier. The signals were digitalized at 11025 samples/s by an A/D PCI board installed on a PC and stored in ASCII format by a LabView interface. The signals were filtered and decimated before the Sound Index (SI) was extracted in the Matlab environment. With this system, the abdominal sounds of five volunteers (mean age 22.4 years, range 20 - 25 years) were recorded, 15 min in the fasted state and 45 min after a lactic drink of 157 kcal. The minimum fasted period was 10 h. The six channels were positioned on the abdominal skin following anatomical reference points. The Sound Index analyses suggest increased sound activity after drink test. (AU) | |