This thesis describes the development and testing of an analogue computer capable in principle of solving twentieth-degree polynomials with real coefficients, tenth-degree polynomials with complex coefficients, and of performing Fourier synthesis of even and odd functions as well as simulating system-function response curves. A description of the computer components and layout including all necessary power supplies is given. Emphasis is placed on the correct adjustment procedure. Results from illustrative problems verifying the computer operation are given. These results indicate that in favourable cases, accuracies of two significant figures for the modulus and of two degrees for the argument are obtainable for the zeros of a polynomial. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate

No description available.

Thesis (M.S.)--University of Wisconsin--Madison, 1965. / eContent provider-neutral record in process. Description based on print version record. Bibliography: l. 43-44.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1958. / Abstracted in dissertation abstracts, v. 18 (1958) no. 6, p. 2092. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 132-136).

The ultimate measure of performance of any communication system is the subjective quality of the received message. In this thesis, the subjective quality of the output of a differential pulse code modulation (DPCM) system was measured as a function of the number of bits of quantization L, the speech bandwidth W, the ratio r of the sampling frequency fs to the Nyquist frequency 2W, and the number of feedback samples N. For previous-sample feedback (N = 1) the maximum subjective quality was obtained as a function of the bit rate R = 2rWL. The optimum sampling rate .was found to be the Nyquist rate; the improvement afforded by increasing fs over 2W was more than offset by the required increase in bit rate. Noise in the feedback loop caused by dc offset errors and noise present in the output of the feedback coefficient amplifiers prevented a thorough investigation of two- and three- sample feedback, although some results were obtained. The subjective quality of delta modulated (ΔM) speech was obtained vs r and W, and the quality of amplitude modulated (ΔM) speech was measured as a function of W and channel signal-to-noise ratio. A technique was then devised to use the AM results to estimate the subjective quality of phase modulated (PM) speech. A comparison was then made of the capabilities of PCM, DPCM, AM, single sideband-AM (SSB-AM), double sideband-AM (DSB-AM), and PM. It was found that when the available channel capacity is small, SSB-AM and DSB-AM are subjectively better than PCM', DPCM, and ΔM. However, for high quality speech communication, DPCM requires less channel capacity than PCM, ΔM, DSB-AM, SSB-AM or PM. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate

An iterative method of system identification based on solving the integral equation [Formula omitted] for h(σ) at ten equally spaced points (σ[subscript i] = 1,2,..,10) is described. Replacing the above integral by a finite sum at ten different values of τ results in a set of ten equations in the ten unknowns h(σ[subscript i]). A statistically identical and much more easily handled set of equations, obtained by using one-sample products in place of the actual correlation functions, is then solved by a Gauss-Seidel-like iteration method, the convergence properties of which show this approach to the identification problem to be a useful one for a large class of system input signals. A simple computer to realize the above identification method is described in some detail. The use of a simple quantization form of correlation allows shift registers to carry out the required delay operations. Storage for the computer's estimates of the h(σ[subscript i]) is in the form of step motor driven potentiometers, which also carry out one of the multiplication operations. The very encouraging results of a number of relatively realistic identification tests using the computer are given. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate

This research report discussed modern sample and hold theory and techniques and then uses them to develop a new differential sampling concept to solve a real engineering problem, involving the synchronous demodulation of three amplitude modulated direction cosine signals in an unusual noise environment. The problem is discussed in detail and a detailed circuit design solution given. Additionally, the results of a breadboard test of the concept is given that shows the circuit to have a 60dB offset voltage rejection ratio.

LD2668 .T4 1966 A988 / Master of Science

published_or_final_version / Electrical Engineering / Master / Master of Science in Engineering

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