Distortion product otoacoustic emissions (DPOAEs) recorded in the ear canal are a composite or vector sum of two underlying components. The relationship between hearing thresholds and DPOAE-component level, rather than composite level, has been of recent interest. Two different signal-processing methods, inverse fast Fourier transform (IFFT) with time-windowing and low-pass filtering, were used...

In this project an ECG signal processing module will be implemented in VHDL on FPGA platform. The digital filtering will be carried out with low pass FIR architecture. Filters shall filter the 50 Hz coupled noise and other high frequency noises. The filtered signal is subjected to Short Time Fourier transform by which lot of inferences can be made by medical experts. A recorded ECG signal will ...

A procedure is evaluated for the analysis of the tritium release from neutron irradiated lithium ceramics by means of temperature ramps, and tritium detection using ionization chambers or proportional counters. A system with convolution time constants and delays of the order of 1 min., and heat rates of 1 to 10 K/min. is considered as a reference. The squared error minimization method is shown ...

2014 Metallic particles crystallized on MgO cubes have been observed in profile view in HRTEM. The images are processed in order to improve the visibility of the particles morphology and the eventual defects at the interface metal/MgO. Three different filters have been used, all of them working in the Fourier space. A band pass filter keeping all the spatial frequencies close to the (200) refle...

Light propagation in a free space is a common computational task in many computer generated holography algorithms. A solution based on the angular spectrum decomposition is used frequently. However, its correct off-axis numerical implementation is not straightforward. It is shown that for long distance propagation it is necessary to use digital low-pass filtering for transfer function calculati...

The Fractional Fourier Transform is a generalized form of Fourier Transform, which can be interpreted as a rotation by angle ? in time-frequency plane or decomposition of signals in terms of chirps. However it fails in locating Fractional Fourier Domain Frequency contents. Short-time FRFT variants are suitable for analysis of multicomponent and non-linear chirp signals with improved time-freque...

Transfer entropy (TE) provides a generalized and model-free framework to study Wiener-Granger causality between brain regions. Because of its nonparametric character, TE can infer directed information flow also from nonlinear systems. Despite its increasing number of applications in neuroscience, not much is known regarding the influence of common electrophysiological preprocessing on its estim...

Deep convolutional networks are vulnerable to image translation or shift, partly due common down-sampling layers, e.g., max-pooling and strided convolution. These operations violate the Nyquist sampling rate cause aliasing. The textbook solution is low-pass filtering (blurring) before down-sampling, which can benefit deep as well. Even so, non-linearity units, such ReLU, often re-introduce prob...

A 3D windowed Fourier transform is proposed for fringe sequence analysis, which processes the joint spatial and temporal information of the fringe sequence simultaneously. The 2D windowed Fourier transform in the spatial domain and the 1D windowed Fourier transform in the temporal domain are two special cases of the proposed method. The principles of windowed Fourier filtering and windowed Four...