Asynchronous signal-dependent non-uniform sampler

Azime Can-Cimino; Luis F. Chaparro; Ervin Sejdić

doi:10.1117/12.2050568

23 May 2014 Asynchronous signal-dependent non-uniform sampler

Azime Can-Cimino, Luis F. Chaparro, Ervin Sejdić

Proceedings Volume 9109, Compressive Sensing III; 910907 (2014) https://doi.org/10.1117/12.2050568
Event: SPIE Sensing Technology + Applications, 2014, Baltimore, MD, United States

Abstract

Analog sparse signals resulting from biomedical and sensing network applications are typically non–stationary with frequency–varying spectra. By ignoring that the maximum frequency of their spectra is changing, uniform sampling of sparse signals collects unnecessary samples in quiescent segments of the signal. A more appropriate sampling approach would be signal–dependent. Moreover, in many of these applications power consumption and analog processing are issues of great importance that need to be considered. In this paper we present a signal dependent non–uniform sampler that uses a Modified Asynchronous Sigma Delta Modulator which consumes low–power and can be processed using analog procedures. Using Prolate Spheroidal Wave Functions (PSWF) interpolation of the original signal is performed, thus giving an asynchronous analog to digital and digital to analog conversion. Stable solutions are obtained by using modulated PSWFs functions. The advantage of the adapted asynchronous sampler is that range of frequencies of the sparse signal is taken into account avoiding aliasing. Moreover, it requires saving only the zero–crossing times of the non–uniform samples, or their differences, and the reconstruction can be done using their quantized values and a PSWF–based interpolation. The range of frequencies analyzed can be changed and the sampler can be implemented as a bank of filters for unknown range of frequencies. The performance of the proposed algorithm is illustrated with an electroencephalogram (EEG) signal.

Citation Download Citation

Azime Can-Cimino, Luis F. Chaparro, and Ervin Sejdić "Asynchronous signal-dependent non-uniform sampler", Proc. SPIE 9109, Compressive Sensing III, 910907 (23 May 2014); https://doi.org/10.1117/12.2050568

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
10 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Signal processing

Analog electronics

Modulation

Modulators

Quantization

Reconstruction algorithms

Statistical analysis

Show All Keywords

Keywords/Phrases

Search In:

Publication Years