
Accession Number : AD0287785
Title : THE DESIGN AND DEVELOPMENT OF THE R1084 SINGLESIDEBAND RADIO RECEIVER
Corporate Author : ROME AIR DEVELOPMENT CENTER GRIFFISS AFB N Y
Personal Author(s) : SIMPSON,PAUL D.
Report Date : SEP 1962
Pagination or Media Count : 1
Abstract : A time invariant system is said to be physially realzable if its unit impulse response, ht), is zero for t 0. It is often assumed in treatments of physical realizability that the Fourier transform of h(t) is square integrable (L sub 2 (neg. infinity, pos. infinity)). Some use is then made of the regularity of the transform for real frequencies, to derive further properties of the transform. The condition that the system be stable leads to a different assumption, that the absolute value of h(t) be integrable (is L (negative infinity, positive infinity)); this implies only uniform continuity of the transform for real frequencies. Physically realizable, stable systems are discussed, and several necessary, and a few sufficient, conitions on the Fourier transform of h(t) are summarized. In particular, the behavior of the transform for complex frequencies, the Bode relations, and the PaleyWiener criterion are reviewed. (Author)
Descriptors : *COMMUNICATION AND RADIO SYSTEMS, *RADIO RECEIVERS, *SIDEBANDS, DESIGN, HIGH FREQUENCY
Distribution Statement : APPROVED FOR PUBLIC RELEASE