Browse Prior Art Database

Audio Response for Head to Disk Track Alignment

IP.com Disclosure Number: IPCOM000050623D
Original Publication Date: 1982-Nov-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Barr, ER: AUTHOR [+2]

Abstract

Shown above is the schematic block diagram of electronic circuits to provide an audio error signal to an operator aligning magnetic heads on a disk drive. As the head is aligned by the operator to optimum track centerline on the disk, the beat frequency of the audio output signal goes to zero.

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Audio Response for Head to Disk Track Alignment

Shown above is the schematic block diagram of electronic circuits to provide an audio error signal to an operator aligning magnetic heads on a disk drive. As the head is aligned by the operator to optimum track centerline on the disk, the beat frequency of the audio output signal goes to zero.

In operation, a test disk is placed in the disk drive and the magnetic head is positioned approximately over the test track on the disk. The analog signal from the transducer reading the test track is analyzed by the detector amplifier 10. The amplifier generates a voltage level which varies as the position of the head varies with respect to the nominal centerline of the test track. The voltage is applied to a voltage-controlled oscillator 12 having a variable frequency output between 0 and 1 KHz.

The output of the voltage control oscillator 12 is beat against 1 KHz reference signal from oscillator 14. The combined signals are passed through low-pass filter 16 which passes only the beat frequency. The beat frequency is amplified by amplifier 18 and used to drive a speaker 20.

The operator manually adjusts the position of the magnetic head as he listens to the beat frequency through speaker 20. When the head is moved to the nominal centerline of the test track, the beat frequency goes to 0 Hz.

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