Boots – shoes – and leggings
Patent
1994-03-01
1996-02-06
Trammell, James P.
Boots, shoes, and leggings
371 51, 360 53, G11B 509
Patent
active
054900913
ABSTRACT:
A method and apparatus for measuring the error rate of a magnetic recording device, such as a hard disk storing a set of data. The apparatus has a partial response maximum likelihood data detecting channel (PRML channel) which differs from a conventional PRML channel by including a noise processing unit (66) which is connected between the output of an A/D converter (54) and the input of a sequence detector (60), and a histogrammer (70), which is connected to the output of a noise processing unit. The method consists of estimating a sequence of noise samples received from the output of the A/D converter (54), processing the sequence of noise samples according to a plurality of predetermined sets of processing coefficients, accumulating a plurality of histograms of segregated processed noise samples, and processing the plurality of histograms so as to determine a dependence of a number of errors on a preselected criterion which characterizes a signal-to-noise ratio of the PRML channel. The above dependence can be extrapolated for an actual error rate of the channel being tested.
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Kogan Andrew
Taratorin Alexander
Tesler Alexander
Varsanofiev Dmitry
Guzik Technical Enterprises, Inc.
Pressman David
Trammell James P.
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