Browse Prior Art Database

Data Transmission System

IP.com Disclosure Number: IPCOM000097184D
Original Publication Date: 1962-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Meyer, OF: AUTHOR

Abstract

This data transmission system utilizes a free running multivibrator 11. It is switchable under control of the binary input data to produce an output having a frequency of either F1 or F2. The output signal from multivibrator 11 is coupled to a telephone transmission line through transformer 12. The line is coupled to amplifier 14 at the receiving end through transformer 13.

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Data Transmission System

This data transmission system utilizes a free running multivibrator 11. It is switchable under control of the binary input data to produce an output having a frequency of either F1 or F2. The output signal from multivibrator 11 is coupled to a telephone transmission line through transformer 12. The line is coupled to amplifier 14 at the receiving end through transformer 13.

The output from amplifier 14 is supplied to resonant filter circuit 16 which is tuned to reject frequency F2. The output from filter 16 is halfwave rectified by diode 17 and supplied to a low-pass filter 18. This smooths the signal and supplies it to squarer 19. Device 19 squares up the binary pulses to produce a binary output signal train.

Although only signal F1 carries the binary information, the transmission of both signals F1 and F2 maintains a signal continuously on the telephone line. Such prevents the activation of companders which come into action in the absence of a signal on the line.

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