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# Adaptive Measurement of Unsymmetrical Interference

IP.com Disclosure Number: IPCOM000060480D
Original Publication Date: 1986-Apr-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 33K

IBM

## Related People

Schneider, RC: AUTHOR [+2]

## Abstract

A technique is described for measuring interference in unsymmetrical read pulse signals in magnetic recording. In the read signal in Fig. 1, IP / IN . In a coded pattern the signal amplitude at time N is: SN = IP DN-1 + DN+IN DN+1 (1) where DN = the detected signal at time N with possible values (-1, 0, 1), and estimates of IP and IN (IPIN) can be derived using the average values IPIN . (Image Omitted) Fig. 2 illustrates a block diagram for the system. The values of IP+IN can be used to drive unequal tap weights on a transversal filter or a filter of the form (1+AS) (1-BS), where S is the laplace operator and A and B are variable gains to compensate for IP and IN, respectively.

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A technique is described for measuring interference in unsymmetrical read pulse signals in magnetic recording. In the read signal in Fig. 1, IP / IN . In a coded pattern the signal amplitude at time N is: SN = IP DN-1 + DN+IN DN+1
(1) where DN = the detected signal at time N with possible values (-1, 0, 1), and estimates of IP and IN (IPIN) can be derived using the average values IPIN .

(Image Omitted)

Fig. 2 illustrates a block diagram for the system. The values of IP+IN can be used to drive unequal tap weights on a transversal filter or a filter of the form (1+AS) (1-BS), where S is the laplace operator and A and B are variable gains to compensate for IP and IN, respectively.

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