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ANSDM converters dynamic range design process

Golański Ryszard, Godek Juliusz

Science, Technology and Innovation

2020

Vol. 10, no. 3

1--7

The results of analytic and simulating works proved that for nonstationary sources, the delta converters with adaptive sampling expose higher coding efficiency than the former proposals, based on uniform sampling methods. The knowledge of the sampling interval range and the algorithm of the Nonuniform Sampling Delta Modulation and Adaptive Nonuniform Sampling Delta Modulation allows finding the necessary number of the sampling intervals and their values that maximizes SNR. The total dynamic range of the ANSDM modulator is the product of the dynamic range both from sampling interval and step size adaptation. Due to the high complexity of the calculations, the ANSDMsoft program was developed to support computing. All computational works were carried out using the Maple environment. Maple allows to solve complex mathematical functions and display their results in a simple way. Most importantly, it supports the LambertW function, used in the computing of NSDM or ANSDM modulators parameters. Graphic illustrations of the NSDM and ANSDM modulator dynamic range as a function of the minimum and maximum sampling frequency are presented.

Optimization of measurement and analysis parameters of burnishing surfaces

Łętocha A., Miller T., Kalisz J.

Mechanik

2017

R. 90, nr 11

1030--1034

Przedstawiono badania związane z optymalizacją pomiarów chropowatości dla topografii powierzchni uzyskanych poprzez frezowanie, a następnie nagniatanie utwardzonego stopu aluminium. Pomiary wykonano profilometrem stykowym TOPO 01. Wybrano najlepsze parametry pomiaru. Wykonano także dodatkowe pomiary z wybraną konfiguracją, analizę struktury geometrycznej powierzchni oraz sporządzono statystykę parametrów chropowatości profilu.

Studies related to the optimization of roughness measurements for surface topography obtained by milling and subsequent burnishing of hardened aluminum alloys, are presented. The measurements were made using the TOPO 01 contact profilometer. The best measurement parameters were selected. Additional measurements were also made with selected configuration, geometric surface analysis, and profile roughness statistics.