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Browse Prior Art Database

Adjusting Rotary Head Magnetic Recorders

IP.com Disclosure Number: IPCOM000088800D
Original Publication Date: 1977-Aug-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Fahring, PD: AUTHOR [+2]

Abstract

A tape is step-by-step transported over a mandrel past a rotor carrying a head or transducer (not shown). The recorder must be synchronized such that the circuits connected to the head operate synchronously with the head passing signals (not shown) recorded on the tape. Typically, the head scans a diagonal line across the tape. For adjustment purposes a tachometer T is sensed to supply tach pulses to an adjustment analyzer, a digital computer. Simultaneously, readback circuits process signals sensed by the head to provide a data gate signal and an amp sense signal. The adjustment analyzer has a disk reader for receiving a disk of the type used with an IBM 23FD disk unit.

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Adjusting Rotary Head Magnetic Recorders

A tape is step-by-step transported over a mandrel past a rotor carrying a head or transducer (not shown). The recorder must be synchronized such that the circuits connected to the head operate synchronously with the head passing signals (not shown) recorded on the tape. Typically, the head scans a diagonal line across the tape.

For adjustment purposes a tachometer T is sensed to supply tach pulses to an adjustment analyzer, a digital computer. Simultaneously, readback circuits process signals sensed by the head to provide a data gate signal and an amp sense signal. The adjustment analyzer has a disk reader for receiving a disk of the type used with an IBM 23FD disk unit.

The illustrated signals show (a) typical read signals from a head, (b) an amp- sense signal which indicates satisfactory amplitude from the head, (c) rotor tach pulses, and (d) the read data gate signal which signifies the onset of the data portion of the read signal. S1-S4 are recorded servo signals. ID means track identification. It is desired to adjust the timing operation of the recorder to a predetermined delay between the initial rise of the read data gate and the onset of the actual data signal.

The adjustment analyzer is programmed to include a branch instruction which determines whether or not the time delay between the read data gate and the onset of the data signal is within predetermined specifications. If not, the timing error is displayed, an...