DocumentCode :
964963
Title :
Experimental determination of the loss and phase transfer functions of a magnetic recording channel
Author :
Haynes, M.K.
Author_Institution :
IBM Corporation, Boulder, Colorado
Volume :
13
Issue :
5
fYear :
1977
fDate :
9/1/1977 12:00:00 AM
Firstpage :
1284
Lastpage :
1286
Abstract :
The loss transfer function of a magnetic recording channel can be readily measured, but delay between writing and reading prevents simple measurement of the phase function. A method is described for experimental determination of these functions for a binary digital magnetic recording channel under conditions similar to normal use, so that the effects of channel parameter variations can be determined. The method involves writing a binary data sequence, reading the resulting output, digitizing and calculating the desired functions by use of the Fast Fourier Transform. A measurement system for achieving adequate accuracy in scanning, sampling and synchronization is described. Examples illustrate the results obtainable, and compare AC biased with unbiased recording, and with theoretical model calculations.
Keywords :
Magnetic measurements; Magnetic tape recording; Binary sequences; Distortion measurement; Frequency; Loss measurement; Magnetic recording; Phase distortion; Phase measurement; Sampling methods; Transfer functions; Writing;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.1977.1059697
Filename :
1059697
Link To Document :
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