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Recording and Reproducing System

IP.com Disclosure Number: IPCOM000095538D
Original Publication Date: 1964-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Lowe, VM: AUTHOR

Abstract

The system is for recording data as frequency patterns and for reproducing the data from the patterns.

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Recording and Reproducing System

The system is for recording data as frequency patterns and for reproducing the data from the patterns.

A series of oscillators 10, 11, etc., are normally in an off condition while oscillator 13 is normally on. Data bits turn oscillator 13 off and turn oscillators 10, 11, etc., on in accordance with data bits as applied, e.g., to And 14 with suitable control signals. The output of the oscillators is recorded by devices not shown, connected to conductor 15.

Data is reproduced by a read head, not shown, amplified and used to control variable frequency oscillator 17. Discriminator 19 develops a voltage proportional to frequency. The voltage is applied in parallel to differential amplifier 21, 24, etc. Zener diode values are chosen to equal the voltage the discriminator 19 generates for each unique bit. The voltage at point B should be approximately equal to the voltage at corresponding point A. Each time a unique bit controls the output of the discriminator 19, the output voltage matches the Zener diode on the input of a differential amplifier, the output of the amplifier goes to zero and the bit is recognized.

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