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Robert Orr
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Sleep-detection-and-HRV
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[569f14]: / PPG_preproc.m

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function [PPG_filt] = PPG_preproc(PPG,fs)



% By Vandercastele et al. 2018

% Band Pass Filtering

ordr = 5; 

ft_lp = 12; % [Hz]

Wn_lp = ft_lp/(fs/2); 

ft_hp = 0.5; % [Hz]

Wn_hp = ft_hp/(fs/2); 



Wn_bp = [Wn_hp,Wn_lp];



[b,a]    = butter(ordr,Wn_bp);

PPG_filt = filtfilt(b,a,PPG);





end