Browse Prior Art Database

Noise Reduction When Reading Multitrack Magnetic Tape

IP.com Disclosure Number: IPCOM000080536D
Original Publication Date: 1974-Jan-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Haddad, JA: AUTHOR

Abstract

When reading one track of a multitrack magnetic tape, the read head may pick up interference from one or more adjacent tracks.

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Noise Reduction When Reading Multitrack Magnetic Tape

When reading one track of a multitrack magnetic tape, the read head may pick up interference from one or more adjacent tracks.

The figure shows three adjacent tracks T1, T2, T3 of a magnetic tape. T2 is being read. A narrow read head R1 and a wide read head R2 are used to read T2. If R1 senses a signal S, then R2 will sense a signal S+N where N may be due to interference from T1 and/or T3.

Under normal conditions, S is free of noise and the R2 signal is not used. However, if R1 is not precisely positioned on T2 it may pick up a noise signal. The noise signal will also be sensed by R2. In this case, both signals would be correlated in such a manner as to reinforce the desired signal S and/or to reduce the extraneous noise.

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