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A More Symmetrical Fourier Analysis Applied to Transmission Problems

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1 Author(s)
Hartley, R.V.L. ; Bell Telephone Laboratories, Inc., New York, N.Y.

The Fourier identity is here expressed in a more symmetrical form which leads to certain analogies between the function of the original variable and its transform. Also it permits a function of time, for example, to be analyzed into two independent sets of sinusoidal components, one of which is represented in terms of positive frequencies, and the other of negative. The steady-state treatment of transmission problems in terms of this analysis is similar to the familiar ones and may be carried out either in terms of real quantities or of complex exponentials. In the transient treatment, use is made of the analogies referred to above, and their relation to the method of "paired echoes" is discussed. A restatement is made of the condition which is known to be necessary in order that a given steady-state characteristic may represent a passive or stable active system (actual or ideal). A particular necessary condition is deduced from this as an illustration.

Published in:

Proceedings of the IRE  (Volume:30 ,  Issue: 3 )

Date of Publication:

March 1942

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