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Measuring complexity of biomedical signals
(John Wiley & Sons Inc, 2018-09)
It is well known that biomedical signals, such as heart rate variability (HRV), electrocardiogram (ECG), electroencephalogram (EEG), and voice, arise from complex nonlinear dynamical systems, as the cardiovascular, nervous, ...
Discrete wavelet transform signal analyzer
(2007-10-01)
This paper addresses the problem of processing biological data, such as cardiac beats in the audio and ultrasonic range, and on calculating wavelet coefficients in real time, with the processor clock running at a frequency ...
Discrete wavelet transform signal analyzer
(2007-10-01)
This paper addresses the problem of processing biological data, such as cardiac beats in the audio and ultrasonic range, and on calculating wavelet coefficients in real time, with the processor clock running at a frequency ...
EEG signal processing in brain–computer interface
(Elsevier, 2018)
A brain–computer interface (BCI) system employs the electrical signals of the brain of the user to control a device according to the user’s intentions. Thus, the brain activity patterns should be identified by the system ...
A Signal Processing Method for Respiratory Rate Estimation through Photoplethysmography
(Sciencie &Engineering Research Support Society (SERSC), 2018-02)
Monitoring of respiration is crucial for determining a patient´s health status, specially
previously and after an operation. However, many conventional methods are difficult to
use in a spontaneously ventilating patient. ...
A New Algorithm to Score Apnea/Hypopnea Events based on Respiratory Effort Signal and Oximeter Sensors
(Institute of Biomedical Engineering, 2020-08)
Purpose: The aim of this work is to develop and evaluate a new algorithm for the detection of Apnea/Hypopnea events based on the AASM recommendations, with low computational cost and using alternative sensors, such as the ...
A Bayesian approach to convolutive nonnegative matrix factorization for blind speech dereverberation
(Elsevier Science, 2018-10)
When a signal is recorded in an enclosed room, it typically gets affected by reverberation. This degradation represents a problem when dealing with audio signals, particularly in the field of speech signal processing, such ...
Precision of yule-walker methods for the arma spectral model
(2004-12-01)
In this work a new method is proposed of separated estimation for the ARMA spectral model based on the modified Yule-Walker equations and on the least squares method. The proposal of the new method consists of performing ...
On digital signal processing understanding through simulation and animation tools
(IEEE Multidisciplinary Engineering Education MagazineIEEE Education Society Students Activities Committee, 2008)