Embedded System Based on an ARM Microcontroller to Analyze Heart Rate Variability in Real Time Using Wavelets

Table 5

Time required for HRV analysis of the signal 215 (MITBIH database).

Main function	Sub functions (ms)	Execution time (ms) in MCU	Execution time (ms) in Intel i7 (MatLab)
Detector QRS		47	39
	DWT perform
	First difference (<1)
	Squared signal (<3)
	Filter average (<3)
	Find peaks and update threshold (<3)
Save data to SD		5	-
Preprocessing	Remove Artifacts	3	1
Time Domain HRV		30	9
	(<1)
	(<1)
	(<1)
	(<1)
	(<1)
Geometric triangular HRV		89	2
Poincare HRV		1	1
Refresh LCD		50	-
Frequency Domain HRV		4176	163
	(<1)
	and