Spread spectrum based detection using a sound card

Sabiu, Benedetta and Giardini, Mario E. (2019) Spread spectrum based detection using a sound card. In: BioMedEng19, 2019-09-05 - 2019-09-06.

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Abstract

Lock-in amplifiers (LIA) are currently used for signal recovery in the presence of high noise [1]. They are based on low-pass filtering the product of a sinusoidal signal by a reference sinusoid with the same frequency, effectively calculating the zero-time correlation between sinusoid and signal (Figure 1). To ensure that the frequencies of signal and reference are the same, in a LIA signal and reference are phase-locked. We note that LIAs can be sensitive to narrowband noise with a frequency closer to the reference frequency than the bandwidth of the low-pass filter. In this respect, generating a signal synchronous with a pseudorandom reference, and detecting it by correlation with the sequence itself, offers promise of a better noise immunity [2]. In this work we investigate a computer sound card as an acquisition system for the extraction of signal by correlation with a pseudorandom sequence.

Author(s):	Sabiu, Benedetta and Giardini, Mario E. ORCID: https://orcid.org/0000-0003-4849-9683
Item type:	Conference or Workshop Item(Poster)
ID code:	69641
Keywords:	lock in amplifiers, sound card, non invasive mearsurements, Bioengineering, Biomedical Engineering
Subjects:	Technology > Engineering (General). Civil engineering (General) > Bioengineering
Department:	Faculty of Engineering > Biomedical Engineering Strategic Research Themes > Health and Wellbeing
Depositing user:	Pure Administrator
Date deposited:	04 Sep 2019 15:56
Last modified:	17 Nov 2019 01:08
Related URLs:	Event
URI:	https://strathprints.strath.ac.uk/id/eprint/69641
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