Fig. 2
From: LDSC: enhancing lung disease diagnosis using a simple 1D-CNN
Original and preprocessed normal lung signal analysis: (a) Original time-domain waveform. (b) Original frequency spectrum (FFT). (c) Preprocessed time-domain waveform (post-resampling and augmentation). (d) Preprocessed frequency spectrum. (e) MFCC heatmap of a 3-second frame.
