Novel Signal Noise Reduction Method through Cluster Analysis, Applied to Photoplethysmography

Table 1

RMSE comparisons between noncluster and cluster algorithms for different noise situations. Note that where there is significant noise the cluster method returns a time-out error.

Panel in Figure 6	Simulated noise	RMSE between clean median pulse and median of all noisy pulses (153 pulses)	RMSE between clean median pulse and median of cluster (20 pulses)
	Movement artefact (10% noise)	0.03	0.14
	Movement artefact (20% noise)	0.12	0.14
	Movement artefact (30% noise)	0.23	0.11
	Movement artefact (40% noise)	0.27	0.07
(a)	Movement artefact (50% noise)	0.43	0.12
	Movement artefact (60% noise)	0.64	—
(b)	Electrical noise	0.12	0.09
(c)	Movement (30%) and electrical noise	0.66	—