A 2-bit adaptive sigma delta modulation system that inherently eliminates the idle tones present in conventional and other adaptive sigma delta systems is described. The system incorporates both memory and look-ahead instantaneous step-size estimations and, as shown by computer simulation results apart from eliminating the unwanted idle tones despite dithering, it offers improved SNR performanc...

A new digital halftone resolution technique, based on a neural network with connection strengths derived from stochastic power spectra, is proposed. Ulichney's "blue noise" spectrum is used as a basis; alternative spectra are also examined. The new technique is compared with standard resolution techniques, ordered dither, Floyd-Steinberg, and dot diffusion. The new technique appears to offer re...

the direct torque control (dtc) of interior permanent magnet synchronous motor (ipmsm) offers simple structure and fast torque response. the conventional switching table-based dtc (st-dtc) presents some disadvantages like high torque and flux ripple and also variable switching frequency. this paper investigates the improved st-dtc strategies to reduce both torque and flux ripple in dtc of ipmsm...

Additive iterative method in combination with averaging of dithered samples is designed for self-correction of ADC linearity error in the paper. Iterative method is one of the automated error correction techniques. Dithering is a special tool for quantizer performance enhancement. Dither theory for Gaussian noise and averaging has been used for exhibition of method abilities in ADC characterist...

We propose a simple lattice-based scheme for secret key generation from Gaussian sources in the presence of an eavesdropper, and show that we achieve strong secret key rates up to 1/2 nat from the optimal in the case of degraded source models. Our scheme is based on the notion of flatness factor, and does not require dithering.

Potential and density/temperature fluctuation at L-H transition are measured by the heavy ion beam probe (HIBP) on JFT-2M. It has been observed that the time scale of potential change is as fast as 10-100μs when the input power (Pin) is larger than the L-H threshold power (P th). When Pin~Pth, the confinement is improved gradually step by step with sawteeth crashes accompanied with the decrease...

AbstructThe statistical properties of the error in uniform scalar quantization have been analyzed by a number of authors in the past, and is a well-understood topic today. The analysis has also been extended to the case of dithered quantizers, and the advantages and limitations of dithering have been studied and well documented in the literature. Lattice vector quantization is a natural extensi...

1.0 ABSTRACT NIRCam and MIRI have recently put together sets of imaging dither patterns that have been optimized for the anticipated science goals of each instrument. The MIRI set contains patterns that are explicitly optimized for self-calibration, whereas the NIRCam patterns are all optimized for sub-pixel resolution, L-flat mitigation, and gap coverage, without the explicit goal of self-cali...

A strategy to increase the robustness of active MR tracking of microcoils in low signal-to-noise ratio conditions was developed and tested. The method employs dephasing magnetic field gradient pulses that are applied orthogonal to the frequency-encoding gradient pulse used in conventional point-source MR tracking. In subsequent acquisitions, the orthogonal dephasing gradient pulse is rotated wh...