PREPROCESS_PPG_SIGNAL - pre-processes PPG signal.

PREPROCESS_PPG_SIGNAL filters and downsamples a photoplethysmogram (PPG) signal ready for beat detection.

Inputs

  • S : a structure containing three fields:

    • v : a vector of PPG values
    • fs : the sampling frequency of the PPG in Hz
    • no_signal : (optional) a logical indicating whether (1) or not (0) each PPG sample contains a physiological signal

  • options - A structure containing the settings used for the processing:

    • options.do_downsample - (1 or 0, default value of 0) A logical indicating whether or not to downsample the PPG signals prior to analysis.
    • options.downsample_freq - the frequency at which to downsample PPG signals (Hz). Only used if downsampling is enabled by options.do_downsample.
    • options.redo_analysis - A logical indicating whether or not to overwrite existing analysis files in order to redo the analysis
    • options.filtering.elim_high_freqs - ...TBC...
    • options.filtering.elim_low_freqs - ...TBC...

Outputs

  • S : containing the filtered and downsampled PPG signal

Documentation

https://ppg-beats.readthedocs.io/

Author

Peter H. Charlton, University of Cambridge, February 2022.

Version

1.0

License - GPL-3.0

   Copyright (c) 2022 Peter H. Charlton
   This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
   This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
   You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.