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Testing Magnetic Recording Tape

IP.com Disclosure Number: IPCOM000095266D
Original Publication Date: 1965-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Klaas, EC: AUTHOR

Abstract

Increased sensitivity to tape defects while keeping the testing frequency constant is accomplished in this method of testing magnetic recording tape. Practical, operational problems of detecting tape defects in which the defects cause only small signal dropouts are reduced by this method.

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Testing Magnetic Recording Tape

Increased sensitivity to tape defects while keeping the testing frequency constant is accomplished in this method of testing magnetic recording tape. Practical, operational problems of detecting tape defects in which the defects cause only small signal dropouts are reduced by this method.

Tape under test is recorded with a continuous all-1's pattern and immediately read by a read head. Defects present on the tape cause signal amplitude reductions in this read head output signal. The readback signal is a sine wave including the first three harmonic components. The signal amplitude reductions produced by the tape defects are most apparent in the higher harmonic components of the signal. The amplitude reductions due to other extraneous signal components are more apparent in the fundamental component.

Tape testing is therefore performed by tuning the tester circuitry to emphasize the third harmonic component of the read signal rather than the fundamental component. Thus, this method of testing has the effect of increasing the sensitivity to the signals indicating tape defects.

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