Dual-channel photoplethysmography synchronization using a Barker sequence

E Zahedi; M M Ali

doi:10.1109/IEMBS.2005.1616835

Dual-channel photoplethysmography synchronization using a Barker sequence

Conf Proc IEEE Eng Med Biol Soc. 2005:2005:1952-5. doi: 10.1109/IEMBS.2005.1616835.

Authors

E Zahedi¹, M M Ali

Affiliation

¹ Department of Electrical, Electronic and System Engineering, Faculty of Engineering, National University Malaysia (Universiti Kebangsaan Malaysia), 43600 Bangi, Selangor, Malaysia.

PMID: 17282604
DOI: 10.1109/IEMBS.2005.1616835

Abstract

A Barker sequence is employed for the synchronization of two photoplethysmogram (PPG) channels. The correctness of this technique is demonstrated by recording a PPG signal, injecting a Barker sequence at the start of this trace and producing a delayed version of it. After preprocessing, cross-correlation techniques are utilized for accurate time alignment of the two traces. The algorithm can correct for any time misalignment as long as the synchronization sequence appears on both channels.