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Circuit for Detecting Errors

IP.com Disclosure Number: IPCOM000098517D
Original Publication Date: 1960-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Boennighausen, RA: AUTHOR

Abstract

This is a sensing circuit for use in error detection in magnetic recording. This circuit senses the transient voltages across the write coil and permits checking the write flux variation against the write amplifier input during the writing period.

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Circuit for Detecting Errors

This is a sensing circuit for use in error detection in magnetic recording. This circuit senses the transient voltages across the write coil and permits checking the write flux variation against the write amplifier input during the writing period.

The magnetic recording circuit has two transistors A and B in a balanced arrangement. Each drives one half of the write coil. The sensing circuit is connected directly across the write coil, so as to sense the transient voltages in that coil. Both ends of the write coil are connected through a diode and resistor network to the base of an emitter follower C. The output of the emitter follower is amplified by another transistor D and the resultant output signal may be compared with the input to the write amplifier by means of circuits not shown.

The circuit also detects errors caused by an open circuit in the write amplifier because of the large inductance in the common emitter circuit. Any unbalance causes the transient to appear across this inductance instead of across the write coil.

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