Algorithm 1: Iterative pulse peak detection.

- Input ECG: $\mathbf{s}$← input ECG

- Set sampling frequency $fs$

- Set a vector of thresholds $\mathbf{t}$ for detecting the pulse peaks

- $\left[W\right]$ = WSST(s, $fs$) - SSWT transform

- ${\mathbf{f}}_1$ = TFRIDGE(W) - frequency ridge in the range of $[0.5-2]$ Hz

- ${\widehat{\mathbf{f}}}_1$ = INTERPRR(${\mathbf{f}}_1$...4...) - Resample frequencies into 4 Hz

- for $thr$ in $\mathbf{t}$  [p] = PEAKDET(s, $thr$)  ${\mathbf{f}}_2$ = $fs$/DIFF(p) - HR frequency  ${\widehat{\mathbf{f}}}_2$= INTERPRR(${\mathbf{f}}_2$...4...) - Resample frequencies into 4 Hz  error($thr$) = ABS(${\widehat{\mathbf{f}}}_2$-${\widehat{\mathbf{f}}}_1$)

- Find set of pulse peaks associated with minimum error