USH588H
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transversal filter used as an equalizer for data readout from a disk drive
Assignee: EMC Corp
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Filing: 1987-10-13
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Granted: 1989-02-07
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Expires: 2007-10-13
Abstract
Abstract A disk drive employs transversal filters as equalizers for each of its read heads, permitting adaptive equalization of read head signals, optimized for each track position.
Inventors
- 👤 II Paul W. Latham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:06
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/012; G11B5/02; G11B5/027; G11B5/035; G11B5/09
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
44 words
In a data storage device for storing data on a magnetic medium and having read heads for retrieving the data from the magnetic medium, an equalizer operatively connected to each read head comprising a transversal filter for equalizing the data from the read head.
Claim 2
Dependent Claim
44 words
In a data storage device for storing data on a magnetic medium and having read heads for retrieving the data from the magnetic medium, an equalizer operatively connected to each read head comprising a transversal filter for equalizing the data from the read head.
Claim 3
Dependent Claim
101 words
The equalizer recited in claim 1, wherein the transversal filter comprises a delay line having a first end and a second end, the first end being operatively connected to the read head, the delay line having a plurality of taps for delaying the signal from the read head by varying amounts; a plurality of multipliers, one connected to each of the taps for multiplying the plurality of delayed read head signals each by a weight; and a summer connected to each of the plurality if multipliers for adding the plurality of delayed multiplied read head signals to produce the equalized output.
Claim 4
Dependent Claim
18 words
The equalizer recited in claim 2, further comprising means for dynamically imputting the weights from a digital computer.
Claim 5
Dependent Claim
37 words
The equalizer recited in claim 2, wherein a certain one of the weights always has a value of one, and further comprising means for dynamically inputting the weights other than the certain one from a digital computer.
Claim 6
Dependent Claim
19 words
The equalizer recited in claim 2 further comprising reflecting means connected to the second end of the delay line.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |