Media flaw detection apparatus for a magnetic disk drive with sq

Details Media flaw detection apparatus for a magnetic disk drive with sq Media flaw detection apparatus for a magnetic disk drive with sq

1990-12-21

1992-06-09

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

328120, 328166, 329358, 360 25, G01R 3312, G01N 2782, G11B 2736

Patent

active

051210576

ABSTRACT:
A media flaw detection apparatus having a sensitivity which is independent of the location of the flaw relative to the written test signal. The apparatus is equally sensitive to missing or extra bit defects. According to the invention, in-phase and quadrature-phase signals are heterodyned against the analog playback input signal. The resulting signals are squared and summed to produce a signal analogous to the effect of the flaw.

REFERENCES:
patent: 3492591 (1970-01-01), Shapiro
patent: 3792364 (1974-02-01), Ananias
patent: 4359692 (1982-11-01), Ryan
patent: 4394626 (1983-07-01), Kurahara et al.
patent: 4517680 (1985-05-01), Betts et al.
patent: 4754222 (1988-06-01), Felleisen et al.
patent: 4881136 (1989-11-01), Shiraishi et al.
patent: 4881246 (1989-11-01), Long
patent: 4929894 (1990-05-01), Monett
patent: 4959619 (1990-09-01), Delacroix et al.
Davenport and Root, "An Introduction to the Theory of Random Signals and Noise" McGraw-Hill, New York, 1958, pp. 265-267.
Bedrosian, S. D., "Normalized Design of 90 Phase-Difference Networks", IRE Transactions on Circuit Theory, Jun. 1960, pp. 128-136.

Affiliated with

Also associated with

Rating

Media flaw detection apparatus for a magnetic disk drive with sq does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Media flaw detection apparatus for a magnetic disk drive with sq, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Media flaw detection apparatus for a magnetic disk drive with sq will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1807141