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US 4,171,467 AGranted
Signal multiplexing circuit
AssigneeBell Telephone Laboratories, Incorporated
InventorLeonard N. Evenchik
Life of this patent
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AssigneeBell Telephone Laboratories, Incorporated
InventorLeonard N. Evenchik
Estimating the term…
The disclosed signal multiplexing circuit makes use of a single pair of wires to interface a data and voice communication circuit such as an electronic key telephone (EKT) station set with a central data and voice communication system such as a business communication system (BCS). The signal multiplexing circuit transmits outgoing standard voice signals, outgoing data and outgoing auxiliary signals and, in turn, simultaneously receives incoming standard voice signals, incoming data and incoming auxiliary signals on the single pair of wires. Both time division and frequency separation techniques are concurrently employed to achieve multiple use of the single pair of wires without crosstalk between the plurality of signals. The data signals are transmitted as bipolar bit pairs preceded by a data start pulse pair. The transmission of an outgoing data bipolar pulse pair is delayed until the incoming pulse pair has cleared the line, thus separating incoming and outgoing data in time.
A signal multiplexing circuit for concurrently transmitting outgoing voice signals, outgoing data, outgoing encoded auxiliary signals and receiving corresponding and identically formatted incoming voice signals, incoming data, incoming encoded auxiliary signals on a communication path comprising a single pair of wires, wherein said signal multiplexing circuit comprises:
A signal multiplexing system for use between a central communication system and a remote communication circuit for concurrently transmitting voice signals, data and encoded auxiliary signals bidirectionally between said remote communication circuit and said central communication system via a communication path which comprises a single pair of wires, wherein said signal multiplexing system comprises an interface circuit for connecting said remote communication circuit to said single pair of wires and for connecting said central communication system to said single pair of wires, wherein said interface circuit comprises:
A signal multiplexing circuit for concurrently transmitting voice signals, data and auxiliary signals and receiving corresponding and identically formatted incoming voice signals, incoming data, incoming auxiliary signals on a communication path comprising a single pair of wires, wherein said signal multiplexing circuit comprises:
Dependencies are inferred from the claim text.