The Permanent Gravitational Field in the Einstein Theory by Eisenhart L. P.

By Eisenhart L. P.

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This signal is then cleaned up by passing it through a low-pass filter to remove high-frequency components generated by the sampling process. 1 Generating Signals in MATLAB MATLAB includes a number of built-in functions that make it easy to generate both periodic and aperiodic signals. A small sample of these is shown in the following section. 1]); An exponentially damped sine wave is easily generated by taking the product of an exponential function and a sine wave: x (t ) = A sin (ω o t + ϕ ) e - at.

A ( na + 1) y ( n - na ) , where the coefficients A = [a(1), a(2), . . , a(na + 1)] and B = [b(1), b(2), . . , b(nb + 1)] are generated when the filter is synthesized, as shown in the following MATLAB code. 1 Filter Categories The major filter categories are as follows: • • • • Butterworth (maximally flat), Chebyshev (equiripple) Bessel (linear phase), elliptical. 15 that the cutoff frequency (200 Hz in this case) specified in MATLAB is equal to the 3 dB point for the Butterworth filter and to the pass-band ripple for the Chebyshev and elliptic filters.

Acoustic Imaging with Electronic Circuits. New York: Academic Press. Harper, N. and McKerrow, P. (1999). Recognizing plants with ultrasonic sensing for mobile robot navigation. Third European Workshop on Advanced Mobile Robots (Eurobot ’99). Hecht, J. (1994). Understanding Lasers: An Entry Level Guide, 2nd ed. New York: IEEE Press. Hollmann, M. (2007). Radar world. Viewed July 2007. org. Larsen, E. (1971). A History of Invention. New York: J. M. Dent & Sons. Lovell, B. (1991). Echoes of War: The Story of H2S Radar.

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