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. 2021 Mar 31;8:585578. doi: 10.3389/fmed.2021.585578

Figure 4.

Figure 4

Cough time-frequency representation analyses. (A) Cough signal 16-bit, frequency range 22050Hz. (B) Power spectrum of the cough audio frame (FFT). (C) Spectrogram. (D) MFCC.