Browse Prior Art Database

Pulse Write Biasing

IP.com Disclosure Number: IPCOM000077784D
Original Publication Date: 1972-Sep-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 20K

Publishing Venue

IBM

Related People

Shelledy, FB: AUTHOR [+3]

Abstract

A magnetic media is write biased by information pulses during recording.

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Pulse Write Biasing

A magnetic media is write biased by information pulses during recording.

When recording on a magnetic media, it is essential to uniformly erase the previously magnetized areas. Positive and negative pulses having different amplitudes are applied to the media by standard techniques. For example, the positive pulses may be bigger than the negative pulses. The positive pulses then perform biasing while the negative pulses represent data.

Looking at the positive pulses only, uniform erasing to a uniform depth occurs if the repetition rate is sufficiently high. Data, in the form of negative pulses, will then not be influenced by a prior record, because the erase (or positive) pulses have written to a greater depth than the prior record.

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