This paper deals with careful non-real-time LPC analysis. A baseline system is first described. lt uses a pitch-synchronous covariancemethod analysis with a laryngograph signal providing the pitch synchrony. Work to improve the voicing decision and F0 determination and to find a better voiced excitation waveform is described. Setting a lower Iimit on the value of B 1 is found to be useful. Buzz...

The standard characterizations of frequency stability are, in the time domain, the Allan (or two-sample) variance and, in the frequency domain, the spectral density function (SDF). The former is mathematically related to the latter by the conversion between time and frequency domain. In this paper, the biases of the Fast Fourier transform (FFT) spectral estimate with Hanning window are checked ...

OBJECTIVES To utilize single photon emission computerized tomography performed in sequence to determine the osseo-integrating capabilities and osteoblastic activities of a new bone regeneration technique called the membrane--sandwich technique (Ogunsalu sandwich bone regenerating technique) and to compare the quality and quantity of bone formed by this bone regeneration unit to bone regeneratio...

a r t i c l e i n f o a b s t r a c t Keywords: Lung sounds Crackle detection Time–frequency and time–scale analysis Dual-tree complex wavelet transform Denoising Ensemble methods Support vector machines Pulmonary crackles are used as indicators for the diagnosis of different pulmonary disorders in auscultation. Crackles are very common adventitious transient sounds. From the characteristics of...

"Honeycomb Composite Sandwich Structure" (HCSS), is widely used to form major structural components of aerospace, marine and automotive vehicles due to its high strength to weight ratio and high energy-absorption capabilities. In service, the bond between the honeycomb core and skin may degrade with aging and continuous cyclic loadings leading to separation of the load bearing skin from the hon...

Introduction: Acquisition-weighted (AW) imaging by acquiring a varying number of averages depending on the position in k-space is widely used in CSI for suppression of contamination by the sidebands of the spatial response function (SRF). In addition, it has been shown that the apparent SNR can be increased due to the reduction of negative signal contributions from adjacent voxels [1]. In cases...

Presence of optical aberrations degrades the performance system. These effects can be reduced by inserting proper amplitude filters. In current study, suitable amplitude-apodization pupils have been used for tailoring point spread function (PSF), in order to attain full-width at half-maximum (FWHM) and suppressed side lobes. Intensity profiles unapodized variable apodized cases considered. By c...

Conventional ultrasonic transducers cannot withstand high temperatures for two main reasons: the piezoelectric elements within them depolarize, and differential thermal expansion of the different materials within a transducer causes them to fail. In this paper, the design of a high-temperature ultrasonic thickness gauge that bypasses these problems is described. The system uses a waveguide to i...