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.
|
Text (Sabiu-Gardini-BioMedEng-2019-Spread-spectrum-based-detection-using-a-sound)
Sabiu_Gardini_BioMedEng_2019_Spread_spectrum_based_detection_using_a_sound.pdf Final Published Version Download (1MB)| Preview |
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.
Creators(s): |
Sabiu, Benedetta and Giardini, Mario E. ![]() | 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: | 20 Jan 2021 15:06 |
Related URLs: | |
URI: | https://strathprints.strath.ac.uk/id/eprint/69641 |
Export data: |