# Mathematik fuer Ingenieure und Naturwissenschaftler 3: by Lothar Papula PDF

By Lothar Papula

ISBN-10: 3834802255

ISBN-13: 9783834802255

Similar mathematics books

Visual Thinking in Mathematics by Marcus Giaquinto PDF

Visible pondering - visible mind's eye or conception of diagrams and image arrays, and psychological operations on them - is omnipresent in arithmetic. is that this visible pondering simply a mental reduction, facilitating snatch of what's collected by means of different capability? Or does it even have epistemological services, as a method of discovery, realizing, or even evidence?

Download e-book for iPad: The Joy of x: A Guided Tour of Math, from One to Infinity by Steven H. Strogatz

Many folks take math in highschool and quickly put out of your mind a lot of it. yet math performs an element in all of our lives the entire time, no matter if we all know it or now not. within the pleasure of x, Steven Strogatz expands on his hit manhattan instances sequence to provide an explanation for the large rules of math lightly and obviously, with wit, perception, and extraordinary illustrations.

Extra info for Mathematik fuer Ingenieure und Naturwissenschaftler 3: Vektoranalysis, Wahrscheinlichkeitsrechnung (2008)

Example text

Speciﬁcally, x[n] can be decomposed as the sum of the three sequences x[−2]δ[n + 2], x[0]δ[n], and x[3]δ[n − 3] representing the three nonzero values in the sequence x[n]. The sequences x[−2]h[n + 2], x[0]h[n], and x[3]h[n − 3] are the system responses to x[−2]δ[n + 2], x[0]δ[n], and x[3]δ[n − 3], respectively. The response to x[n] is then the sum of these three individual responses. Although the convolution-sum expression is analogous to the convolution integral of continuous-time linear system theory, the convolution sum should not be thought of as an approximation to the convolution integral.

Discrete-time signals are deﬁned at discrete times, and thus, the independent variable has discrete values; that is, discrete-time signals are represented as sequences of numbers. Signals such as speech or images may have either a continuous- or a discrete-variable representation, and if certain conditions hold, these representations are entirely equivalent. Besides the independent variables being either continuous or discrete, the signal amplitude may be either continuous or discrete. Digital signals are those for which both time and amplitude are discrete.

One of the important aspects of the impulse sequence is that an arbitrary sequence can be represented as a sum of scaled, delayed impulses. 4 can be expressed as p[n] = a−3 δ[n + 3] + a1 δ[n − 1] + a2 δ[n − 2] + a7 δ[n − 7]. 4) More generally, any sequence can be expressed as ∞ x[k]δ[n − k]. 5) k=−∞ We will make speciﬁc use of Eq. 5) in discussing the representation of discrete-time linear systems. 3b) is deﬁned as 1, n ≥ 0, 0, n < 0. 7) k=−∞ that is, the value of the unit step sequence at (time) index n is equal to the accumulated sum of the value at index n and all previous values of the impulse sequence.