Signal multiplexing circuit
First Claim
1. A signal multiplexing circuit for use between a central communication system and a remote communication circuit for concurrently transmitting outgoing voice signals, outgoing data, and outgoing auxiliary signals from said remote communication circuit to said central communication system via a communication path which comprises a single pair of wires, wherein said signal multiplexing circuit comprises:
- encoding means for converting said outgoing auxiliary signals into pulse coded signals;
isolation means for separating said outgoing voice signals, said outgoing data and said outgoing encoded auxiliary signals from each other in both frequency and time, andtransmitting means for transmitting said separated signals to said central communication system via said single pair of wires.
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Accused Products
Abstract
The disclosed signal multiplexing circuit (110) makes use of a single pair of wires (T, R) to interface a data and voice communication circuit such as an electronic key telephone (EKT) station set (100) with a central data and voice communication system such as a communication system (BCS). The signal multiplexing circuit transmits outgoing standard voice signals, outgoing auxiliary signals and outgoing data 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 outgoing data bipolar bit pairs are delayed until the center transition of the incoming data bipolar pulse pair is detected. The first half of the incoming data bipolar pulse pair appears on the line undisturbed while the second half of the same pulse pair is "overwritten" by the first half of the outgoing data bipolar pulse pair.
16 Citations
16 Claims
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1. A signal multiplexing circuit for use between a central communication system and a remote communication circuit for concurrently transmitting outgoing voice signals, outgoing data, and outgoing auxiliary signals from said remote communication circuit to said central communication system via a communication path which comprises a single pair of wires, wherein said signal multiplexing circuit comprises:
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encoding means for converting said outgoing auxiliary signals into pulse coded signals; isolation means for separating said outgoing voice signals, said outgoing data and said outgoing encoded auxiliary signals from each other in both frequency and time, and transmitting means for transmitting said separated signals to said central communication system via said single pair of wires. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A signal multiplexing circuit for concurrently transmitting outgoing voice signals, outgoing data, and outgoing auxiliary signals on a communication path comprising a single pair of wires, wherein said signal multiplexing circuit comprises:
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encoding means for converting said outgoing auxiliary signals into bipolar pulse pair signals; formatting means for converting said outgoing data to bipolar pulse pair digital signals; isolation means for separating said outgoing voice signals from both said formatted outgoing data and said outgoing encoded auxiliary signals in frequency; time division means for separating said formatted outgoing data from said outgoing encoded auxiliary signals in time; and transmitting means for transmitting said separated outgoing voice signals, formatted outgoing data and outgoing encoded auxiliary signals on said single pair of wires. - View Dependent Claims (12, 13, 14)
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15. A signal multiplexing system for use between a central communication system and a remote communication circuit for concurrently transmitting outgoing voice signals, outgoing data, and outgoing 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:
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encoding means for converting said outgoing auxiliary signals into pulse coded signals; isolation means for separating said outgoing voice signals, said outgoing data and said outgoing encoded auxiliary signals from each other in both frequency and time, and transmitting means for concurrently transmitting said separated signals on said single pair of wires. - View Dependent Claims (16)
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Specification