Showing papers by "Pedro Silva Girao published in 1994"
10 May 1994
TL;DR: A computer based measuring system dedicated to the determination of both the probability distribution function and autocorrelation function of a noise signal, which is particularly suited not only to calculate the power spectral density of a signal, but also to recover periodic signals buried in noise.
Abstract: This paper describes a computer based measuring system dedicated to the determination of both the probability distribution function and autocorrelation function of a noise signal. The system, conceived as a sequential one, is hybrid, with most of the necessary manipulation of signals performed in the analog domain. Details of both hardware and software implementation, as well as results obtained for a Gaussian band limited noise generator, are presented. The system is particularly suited not only to calculate the power spectral density of a signal (using Wiener-Khintchine theorem) and cross-correlation between two signals, but also to recover periodic signals buried in noise. >
1 citations
12 Apr 1994
TL;DR: In this paper, the authors present the implementation of a measurement instrument which may be used to operate either as a vector voltmeter or an wattmeter, which is supported in commercial integrated circuits, which leads to an 40 kHz bandwidth, 1% accuracy, low cost multi-purpose apparatus.
Abstract: This paper presents the implementation of a measurement instrument which may be used to operate either as a vector voltmeter or an wattmeter. The device, designed for educational purposes, is supported in commercial integrated circuits, which leads to an 40 kHz bandwidth, 1% accuracy, low cost multi-purpose apparatus. >
1 citations