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Magnetic Recording Characterization System

IP.com Disclosure Number: IPCOM000091383D
Original Publication Date: 1968-Jan-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Braun, RE: AUTHOR [+3]

Abstract

This system determines the basic parameters of magnetic recording elements, including recording and playback transducers and recording media.

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Magnetic Recording Characterization System

This system determines the basic parameters of magnetic recording elements, including recording and playback transducers and recording media.

The system includes a conventional tape drive having record tape 1 arranged to be driven past write head 2 and read head 3. Any of these three elements can be a test element, while the others are standard elements. By manipulating the circuits shown, any of three characterization tests can be accomplished with visual results displayed.

One characteristic that can be displayed is the signal output versus recording density characteristic of the test element. This characteristic is determined with selection switch 4 in the position shown. In this conventional write driver 6 coupled in turn to head 2. By running generator 5 through a range of frequencies, the moving tape 1 is recorded with alternating flux reversals of increasing frequency. Head 3 recovers these reversals and supplies them via read amplifier 7 to a conventional demodulator 8. The demodulated output of 8, displayed on oscilloscope 9, is an instantaneous plot of the signal output versus recording density parameter of the recording system.

By rotating switch 4 to the next clockwise position, the saturation characteristic of the system can be displayed. In this position, pulse generator 10 is activated to record a pattern of NRZI 1's on the tape. Variable write current control circuit 11 varies the write current amplitude...