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.

[thumbnail of Sabiu-Gardini-BioMedEng-2019-Spread-spectrum-based-detection-using-a-sound]
Preview
 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.

    ORCID iDs

    Sabiu, Benedetta and Giardini, Mario E. ORCID logoORCID: https://orcid.org/0000-0003-4849-9683;
    CORE (COnnecting REpositories)