Titlebook: An Introduction to the Analysis and Processing of Signals; Paul A. Lynn Textbook 1989Latest edition Macmillan Publishers Limited 1989 comp

嚴(yán)厲批評(píng)

Introductionen used to convey information throughout recorded history, and both Greeks and Romans employed light beacons in the pre-Christian era. A chain of beacons was used by the English in 1588 to warn of the approaching Spanish Armada, and about this time the word ‘signal’ came into general use to denote ‘

Derogate

Periodic Signalsf signal theory in terms of time and of frequency. A periodic signal will therefore be considered to be one which repeats itself exactly every . seconds, where . is called the period of the signal waveform; the theoretical treatment of periodic waveforms assumes that this exact repetition is extende

DEI

Aperiodic Signalse spectrum of such a signal consists of a number of discrete frequencies and is known as a ‘line’ spectrum. Although the analysis of periodic signals gives results which can be of great practical interest, the great majority of signals are not of this type. Firstly, even signals which repeat themsel

艱苦地移動(dòng)

Sampled-Data Signalsntly. In recent years such signals have come to assume great importance because of developments in digital electronics and computing. Since it is not possible to feed continuous data into a digital (as opposed to analogue) computer, any signal or data input must be represented as a set of numerical

Collar

Gustatory

Interstellar

nonchalance

造反,叛亂

Signal Recovery, Detection and Predictiontracting a signal from random noise: it arises to some extent in almost all communication, measurement and recording situations. Another interesting problem is that of predicting the future of a random signal as accurately as possible. Not surprisingly, we shall find the earlier discussions of rando