Heart rate variability (HRV) is a useful clinical tool for autonomic function assessment and cardiovascular diseases diagnosis. It is traditionally calculated from a dedicated medical electrocardiograph (ECG). In this paper, we demonstrate that HRV can also be extracted from photoplethysmograms (PPG) obtained by the camera of a smartphone. Sixteen HRV parameters, including time-domain, frequenc...

A cycle extractor is presented to be used in a speech coder independently from the coding stage. It samples cycle waveforms (CyWs) of the original prediction residual signal at their natural nonuniform rate. It is shown that perfect reconstruction is possible due to the interplay of these properties for two cycle length normalization and denormalization techniques. The coding stage is coupled t...

The heart rate variation has been observed when analyzing the speech analysis of a person sitting at remote place. In the presented approach, 20 –30 years age group person’s speech is recorded using the common recording utility for testing purposes. The time duration for speech production is approximately 1 2 minutes. Further, the entropy, energy, power, mean, frequency, standard deviation and ...

The efficiency of high pressure extraction of lutein diesters from marigold (Tagetes erecta) flower petals has been investigated. The solvents used for extraction were supercritical carbon dioxide and liquid propane. Operating parameters were 300 bar and 40, 60 and 80 °C for CO2 and 100, 150, 200 bar and 40 and 60 °C for propane, respectively. The influence of process parameters on the total yi...

OBJECTIVE This study aimed to investigate the current data regarding age, sex, and Angle Classification of Korean orthodontic patients and influence of these factors on the tendency to undergo extraction and orthognathic surgery. METHODS The recent trends of Korean orthodontic patients were assessed using questionnaire survey. The questionnaires were e-mailed to orthodontists who met the stud...

This paper describes a new method for extracting the fetal heart rate (fHR) and the fetal heart rate variability (fHRV) signal non-invasively using abdominal maternal electrocardiogram (mECG) recordings. The extraction is based on the fundamental frequency (Fourier’s) theorem. The fundamental frequency of the mother’s electrocardiogram signal (fo-m) is calculated directly from the abdominal sig...