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Multiplexing System for Binary Information

IP.com Disclosure Number: IPCOM000098905D
Original Publication Date: 1958-Oct-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Wagner, EG: AUTHOR

Abstract

The circuit is a pulse-position modulated, time-division multiplexing system for determining the condition of an array of remote switches. The binary information to be transmitted is presented in the form of a pulse delay of t or T duration, the former representing a 1 signal and the latter a O signal. A multivibrator is used as a pulse source with a normal pulse rate of 1\T. A stepper switch is provided for successively connecting informational channels to the multivibrator. Each pulse produced is subsequently fed back to the stepper, which then connects the succeeding channel to the multivibrator.

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Multiplexing System for Binary Information

The circuit is a pulse-position modulated, time-division multiplexing system for determining the condition of an array of remote switches. The binary information to be transmitted is presented in the form of a pulse delay of t or T duration, the former representing a 1 signal and the latter a O signal. A multivibrator is used as a pulse source with a normal pulse rate of 1\T. A stepper switch is provided for successively connecting informational channels to the multivibrator. Each pulse produced is subsequently fed back to the stepper, which then connects the succeeding channel to the multivibrator. Each informational channel consists of a switch leading to a common resistor which, when the switch in the channel being sampled is closed, is placed in parallel to the multivibrator biasing resistor, thus increasing the pulse rate to 1/t. A time- division multiplexing transmitter results, which successively samples each channel and transmits pulses separated by time T, unless the channel being sampled contains a binary 1 to be transmitted (channel switch closed). Under the latter conditions, the pulses become separated by time t.

The transmitted pulses are received and channelized by a circuit consisting of a gate arrangement, delay circuit, single shot multivibrator (or equivalent), and a stepper switch. When a pulse is received, it may or may not be passed by the gate depending upon the time since the last pulse was receiv...