Comparison and Noise Suppression of the Transmitted and Reflected Photoplethysmography Signals

Figure 7

Spectral analysis of the reflected PPG signal before and after denoising under strong noise background: (a) the raw PPG signal, (b) the spectrum of the raw signal, (c) the denoised PPG signal, and (d) the spectrum of the denoised signal.

(a)

(b)

(c)

(d)