Browse Prior Art Database

Averaging Skew Detection in a Rotating Head Recorder

IP.com Disclosure Number: IPCOM000083494D
Original Publication Date: 1975-Jun-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Arter, NK: AUTHOR [+3]

Abstract

Shown is a schematic for averaging skew detection in a rotating-head magnetic tape unit. The servoing signals and skew detection per se are described in U. S. Patent 3,845,500, entitled "Head to Track Alignment in a Rotating Head Magnetic Tape Unit," issued October 29, 1974. As discussed in this patent, a transverse data track on magnetic tape has servo tracks at each end of the data track.

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Averaging Skew Detection in a Rotating Head Recorder

Shown is a schematic for averaging skew detection in a rotating-head magnetic tape unit. The servoing signals and skew detection per se are described in U. S. Patent 3,845,500, entitled "Head to Track Alignment in a Rotating Head Magnetic Tape Unit," issued October 29, 1974. As discussed in this patent, a transverse data track on magnetic tape has servo tracks at each end of the data track.

In the present arrangement the leading servo refers to those servo tracks crossed by the rotating head before it reaches a data track, while the trailing servo refers to those servo tracks crossed by the rotating head after transducing the data track.

The skew detection in the patent at each servo track produces a bit count corresponding to misalignment between the rotating head and the center of the data track at each end of the data track. Taking the difference in positional misalignment from the leading servo information and the trailing servo information, yields a skew value indicating the skew between the path of the rotating head and the data track.

Referring to the schematic shown, decode 10 successively decodes the misalignment servo information from the leading servo and then the trailing servo. Signals over lines 12 and 14, respectively, identify for decode 10 whether it is receiving information from the leading servo or the trailing servo.

Arithmetic Logic Unit (ALU) 16 receives misalignment information from the l...