Fig 1.
Spectra and spectrograms of wheezes in lung sounds.
(a) Spectrum 1: Fast Fourier transform (FFT) frame, 0.682–1.054 s; (b) Spectrum 2: FFT frame, 0.700–1.072 s; (c) Spectrum 3: FFT frame, 0.718–1.090 s; (d) Spectrum 4: FFT frame, 0.736–1.108 s.
Fig 2.
Flowchart of the newly developed wheeze recognition algorithm for children.
Table 1.
Participant characteristics.
Table 2.
Classification of sounds in all recorded sound files.
Table 3.
Number of local maximum points of wheeze sounds in all recorded sounds.
Fig 3.
Consecutive maximum values detected on a spectrogram in step 4 of a newly developed wheeze recognition algorithm for children.
Table 4.
Results per file obtained using the newly developed wheeze recognition algorithm for children.
Fig 4.
Automatic discrimination of wheezes from other sounds using the newly developed wheeze detection algorithm for children.