The unbiased FIR filter is investigated to estimate the time interval error (TIE) K-D polynomial model of a local clock in GPS-based timekeeping in the presence of uniformly distributed sawtooth noise. An estimation algorithm is proposed and applied to the GPS-based TIE measurements of a crystal clock without using the sawtooth correction. Based upon this, we show that the TIE estimates fit act...

Longitudinal MR imaging is increasingly being used to measure cerebral atrophy progression in dementia and other neurological disorders. Differences in intensity inhomogeneity between serial scans can confound these measurements. This differential bias also distorts nonlinear registration and makes both manual and automated segmentation of tissue type less reliable. A technique is described for...

A monitoring approach to the problem of constructing fault-tolerant and adaptive real-time systems, based on the fail-signal processor, is described. Low error detection latency time is a primary goal. A fail-signal processor comprises an application processor along with a simple monitoring processor that detects abnormal functional or timing behaviour in the application processor; on such a fa...

Digital image sensor outputs usually must be transformed to suit the human visual system. This color correction amplifies noise, thus reducing the signal-to-noise ratio (SNR) of the image. In subdiffraction-limit (SDL) pixels, where optical and carrier cross talk can be substantial, this problem can become significant when conventional color filter arrays (CFAs) such as the Bayer patterns (RGB ...

Feedback control systems have been used in the past to keep physical models in tune; similarly, other variables can be controlled, such as amplitude, which is explored in this paper. There can be various interesting behaviors; affecting, for example, stability and attack transient characteristics. Examples are shown for a simple waveguide model. The nonlinearity introduced by amplitude control ...

We studied different face velocity and carbon dioxide (CO2) initial concentration to examine the adsorption behavior of calcium oxide (CaO) impregnated activated carbon (AC) filter and also to discuss pseudo-first-order, pseudo-second-order and intra-particle diffusion three kinetic models. The experimental results show that saturation time and saturation capacity were decreased and increased w...

I/Q mismatches are common in radio receivers, which apply quadrature demodulation schemes. Numerous methods have been developed to estimate and correct these errors for narro w-band signals. In this paper a wideband correction method is introduced. First the frequency-dependent I/Q mismatches a.re estimated by local test signal injection. Then a digital filter is constructed to correct them. Wi...

Digital filters are ordinarily used in signal processing circuits and communication systems therefore these must be protected from set of errors more accurately.As complexity is continuously increasing , design and reliability engineers will demand to address several key areas to enable advanced SoC (System-on-chip) products in commercial sector. The first challenge will be to develop more accu...