Communications: electrical – Systems – Selsyn type
Patent
1998-02-13
2000-04-18
Pope, Daryl
Communications: electrical
Systems
Selsyn type
34031006, 324527, 324544, 324551, H04M 1104
Patent
active
060520507
ABSTRACT:
Two-wire signal transmitter and method in which a very low-level Alternating Circuit (AC) input signal sensed at a remote circuit at a first end of a signal path is added to a low-level Direct Current (DC) bias signal provided by a local circuit that is located at a second end of the signal path. In a preferred embodiment, the remote circuit is electrically coupled to and powered by the local circuit through a two-wire path interconnection, typically a shielded twisted-pair cable. The DC bias signal has sufficient level to overcome minimum ratings of electrical contacts, thereby to pass the sensed very low-level AC input signal reliably through the poor electrical contacts that are used, for instance, for connecting electronic circuits that run the length of a railway train. In a preferred embodiment, the use of a unity gain current amplifier as a part of the remote circuit reduces the signal degrading effects of long signal paths, but does not amplify the AC input signal, thereby retaining known pre-determined railroad vitality requirements. An output signal is provided that is an AC coupled, isolated, non-amplified representation of the AC input signal. An alternate preferred embodiment utilizes no active amplifier as a part of the remote circuit, thereby providing a signal transmitter and method that is less complex, has lower cost, requires smaller packaging, and has somewhat better long-term reliability than the preferred embodiment utilizing the active amplifier in the remote circuit.
REFERENCES:
patent: 4528611 (1985-07-01), Udren
patent: 5612624 (1997-03-01), Clinton
patent: 5657324 (1997-08-01), Itkin
Colbaugh Michael E.
Giovannelli Benjamin A.
Kolkman Dick J.
Houser Kirk D.
Pope Daryl
Radack David V.
Union Switch & Signal Inc.
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