H - Electricity – 04 – L
Patent
H - Electricity
04
L
379/68
H04L 25/04 (2006.01) H04B 3/36 (2006.01)
Patent
CA 1260643
ABSTRACT Circuits embodying the invention include apparatus for sensing the amplitude and the frequency of the signals received from one section of a telephone cable and for propagating onto the succeeding section of telephone cable only those received signals having an amplitude greater than a predetermined level and whose frequency is within the predetermined range.
526899
Eckersley Raymond A.
Rca Corporation
LandOfFree
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