A paper by Leconte, Penick, Schramm and Wier1discusses the system aspects of 8-kc program circuits over carrier facilities and outlines the functions of several filters and networks. This paper describes in detail two of the filters and one network. These are: 1. The channel selecting crystal band pass filter used at program terminals of all broad-band carrier systems, 2. The band elimination filter which blocks the program at branching points on type K carrier systems, 3. The network used at branching points on type K carrier systems to simulate the phase shift of the band elimination filter.
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Farkas et al. (1949) studied this question.
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