In this study, a portable, low-cost system, Portable Motion Analyzer (PMA), is introduced to obtain data from daily physical motions, such as ECG, heart rate signals, as well as kinetic information of motion and freeliving gait. It can gather, process and analysis the signals from multiple input channels. To process these signals, digital filtering and wavelet analysis is used for quantitative ...

purpose: to compare intraocular pressure (iop) readings measured by the ocular response analyzer (ora) with those measured by the goldmann applanation tonometer (gat) in keratoconic eyes following penetrating keratoplasty (pkp) and to evaluate the influence of anatomical and biomechanical properties of the grafts on iop measurements. methods: this cross-sectional study was conducted on 45 kerat...

Due to industrial importance of gears in power transmission systems, fault detection and diagnosis of gear transmission systems have attracted considerable attention in recent years, there is constant pressure to improve measuring techniques and tools for early detection and diagnosis of gearbox faults. The time and frequency localization properties of continuous wavelet transform offers a viab...

Signal source quality is a primary driver of performance in advanced radar systems. Lower phase noise in signal sources means better spatial resolution and more accurate velocity measurements of moving objects. Developers have to be able to measure phase noise, even in pulsed mode, in order to minimize it. These measurements have previously required complex systems consisting of phase detectors...

A new simple but robust method of front-end analysis, nonlinear spectral smoothing (NLSS), is proposed. NLSS uses rank-order filtering to replace noisy low-level speech spectrum coefficients with values computed from adjacent spectral peaks. The resulting transformation bears significant similarities with masking in the auditory system. It can be used as an intermediate processing stage between...

Nowadays with increasing use of numerous nonlinear loads, voltage and current harmonics in power systems are one of the most important problems power engineers encounter. Many of these nonlinear loads, because of their dynamic natures, inject time-varying harmonics into power system. Common techniques applied for harmonics measurement and assessment such as FFT have significant errors in presen...

Penganalisis spektrum mengukur besarnya sinyal input versus frekuensi dalam rentang penuh instrumen. Kegunaan utama adalah untuk kekuatan yang diketahui dan tidak dikenal. Sinyal masukan paling umum diukur penganalisis listrik; namun, komposisi spektral dari lain, seperti gelombang tekanan akustik cahaya optik, dapat dipertimbangkan melalui penggunaan transduser sesuai. jenis lain juga ada, opt...

In this paper, we proposed an variable length FFT processor architecture which could be used in multi-mode and multi-standard OFDM communication system. Based on radix-2 single-path delay feedback architecture, FFT is implemented with the aid of LUT and control logic. The expected architecture would complete FFT ranging 2048/1024/512point. Keywords-FFT; Radix-2 FFT; variable length FFT;

The threshing mechanism is the main component of combine harvester on which grain separation and cleaning qualitative work indicators depend. It important to ensure that all components, including drum bearings other combine, are working properly reliably. There many places in where it not possible measure bearing vibrations directly without dismounting them, since there no suitable spot mount a...