Many information systems employ lossy compression as a crucial intermediate stage among other processing components. While the important distortion is defined by the system’s input and output signals, the compression usually ignores the system structure, therefore, leading to an overall suboptimal rate-distortion performance. In this paper we propose a compression methodology for an operational...

Multilevel inverters have been widely applied industries. A family of optimal puisewidth modulation (PWM) methods for multilevel inverters, such as step modulation, can generate output voltage with less harmonic distortion than popular modulation strategies, such as the carrier-based sinusoidal PWM or the space vector PWM. However, some drawbacks limit the application of optimal PWM. One of suc...

The paper addresses a crucial point in ultra-wideband (UWB) radio wave propagation, which is the spatial-temporal resolution of scattering objects into multiple frequency-dependent scattering centers. The effect contributes to the widely observed temporal dispersion of pulse-shaped transmit signals and their distortion, respectively. Particularly the latter is explained by (multiple) diffractio...

Electrodynamic loudspeakers have inherent nonlinearities generating harmonic and intermodulation distortion in the reproduced sound. Some applications of active noise control require loudspeakers having low weight, small size, high efficiency to produce amplitudes at low frequencies. In these cases the signal distortions produced by the loudspeaker’s nonlinearities impair the compensation of th...

In many computer-implemented signal-processing systems, it is necessary to perform numerical integrations. If the function to be integrated is a band-limited time signal represented by a set of samples, serious distortion can occur if the wrong integration technique is used. In particular, if the integration is used to calculate a Fourier transform, large error sidelobes will be introduced if S...

A detailed procedure to learn a nonlinear model together with its first-order derivative data is presented. Two correlated multilayer perceptron (MLP) neural networks providing the model and its first-order derivatives, respectively, are trained simultaneously. Applying this method to FET devices leads to nonlinear models for current and charge fitting derivative parameters. The training data i...

This paper describes a new strategy for pulsewidth modulation (PWM) optimized by a direct method and the application of genetic algorithms (GA) to minimize the harmonic content specifically the fifth and seventh harmonic of the total content, based on the minimum total harmonic distortion (THD). Described the development of the method, the guidelines to take into account including the algorithm...

Data hiding technique aims to embed a little secret information into a carrier signal by changing. The insignificant accessories for copyright protection or covert communication. Commonly circumstances, the data-hiding operation will influence in distortion signal. However, such distortion, unacceptable to a few purposes, e.G., army or scientific pix. On this case it's vital to embed the furthe...