"a powerful learning tool..."
J.J, Ward, MEd, RRT in Respiratory Care
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- Sound at the chest surface or at the neck was recorded with contact accelerometers
(EMT25C, Siemens). Recordings at the mouth were made with an electret microphone
- Air flow was registered with a screen pneumotachograph (model 3350, Spirometrics).
Inductance plethysmography (Respitrace) was used in young children to provide information
about the respiratory pattern.
- The sound signal was high-pass filtered at 7.5 Hz to remove DC offset (1st order
Butterworth filter) and low-pass filtered at 2.5 kHz to avoid aliasing (8th order
Butterworth filter). The original sampling rate was 10 kHz (some files were
upsampled from 5 kHz).
- Analog-to-digital conversion was performed with 16-bit quantization
(AT-MIO-16x, National Instruments), using a notebook PC and R.A.L.E.® software. Some files
were originally acquired with 12-bit quantization (model 2801, DataTranslation) and have been
adjusted for 16-bit presentation.
- Signal processing involved fast Fourier transformation analysis (Hanning data window,
1024 data points, 75% overlap).
In recognition of excellence in health sciences media production, the Health
Sciences Communications Association has given an Award of Merit,
Computer-Based Materials, for the production of R.A.L.E.® (Respiration Acoustics