
Accession Number : AD0705608
Title : HOMOMORPHIC FILTERS FOR CONVOLVED FUNCTIONS,
Corporate Author : SOUTHERN METHODIST UNIV DALLAS TEX INFORMATION AND CONTROL SCIENCES CENTER
Personal Author(s) : Prabhakar,Jagdish C. ; Gupta,Someshwar C.
Report Date : 05 DEC 1969
Pagination or Media Count : 68
Abstract : The capabilities of a limited class of nonlinear systems have been demonstrated. The convolution in its continuous structure is an integral equation involving two or more time functions. Given the value of this integral, it is usually difficult to evaluate the constituent parts. The homomorphic filters discussed in this work accomplish the filtering process through the principle of generalized superposition. This principle enlarges the applicability of principles of superposition and homogeneity (applicable to the well understood linear systems) by associating a vector space with the inputs to nonlinear systems. It is then possible to define a linear transformation which maps an input space to another vector space. However, the number of useful relationships which correspond to the vector addition for the vector space is limited. The linear transformations have been worked out for 'multiplication' and 'convolution' of input elements, besides the familiar case of algebraic addition which does not require this abstract treatment. This dissertation demonstrates the application of the principle of generalized superposition by separating the probability density functions. The functions considered as those that arise in the F.M. detection process and result from the addition of two independent random variables. (Author)
Descriptors : (*INFORMATION THEORY, INTEGRAL TRANSFORMS), TRANSFER FUNCTIONS, FOURIER ANALYSIS, VECTOR SPACES, TRANSFORMATIONS(MATHEMATICS), PROBABILITY DENSITY FUNCTIONS, FREQUENCY MODULATION, CONTROL SYSTEMS, NONLINEAR SYSTEMS
Subject Categories : Cybernetics
Distribution Statement : APPROVED FOR PUBLIC RELEASE