US5357378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data reproducing apparatus with means for differentiating a read head output signal and means for three value detection of the result differentiated
Assignee: Sony Corp
•
Filing: 1992-10-09
•
Granted: 1994-10-18
•
Expires: 2012-10-09
Abstract
Abstract A data reproducing apparatus by which data vertically magnetically recorded on a single layer film medium can be detected readily and accurately with a simple construction by means of a ring head. Upon recording, input data are NRZI converted into a recording sequence, which is vertically magnetically recorded onto a single layer film medium. The data are reproduced from the single layer film medium by means of the ring head, and the reproduction signal is differentiated. The differentiation signal is three-value detected to restore the original data.
Inventors
- 👤 Yoshiyuki Urakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:10
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; G11B20/00; G11B20/10; G11B20/14; G11B20/1488; G11B20/10009; G11B5/09
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
62 words
A data reproducing apparatus for reproducing binary recorded data from a single layer film medium on which the recorded data have been vertically magnetically recorded by means of a ring head, comprising: differentiating means for differentiating a signal reproduced by a ring head from the single layer film medium; and detecting means for three-value detecting the differentiation signal from said differentiating means.
Claim 2
Dependent Claim
62 words
A data reproducing apparatus for reproducing binary recorded data from a single layer film medium on which the recorded data have been vertically magnetically recorded by means of a ring head, comprising: differentiating means for differentiating a signal reproduced by a ring head from the single layer film medium; and detecting means for three-value detecting the differentiation signal from said differentiating means.
Claim 3
Dependent Claim
97 words
A data reproducing binary apparatus for reproducing recorded data from a single layer film medium in which the recorded data have been vertically magnetically recorded by means of a ring head, comprising: differentiating means for differentiating a signal reproduced by a ring head from the single layer film medium; detecting means for detecting a logic value of the differentiation signal from said differentiating means; and correcting means for correction, when two successive results of detection of first and second successive logic values by said detecting means present the logic value 1, the first logic value to 0.
Claim 4
Dependent Claim
97 words
A data reproducing binary apparatus for reproducing recorded data from a single layer film medium in which the recorded data have been vertically magnetically recorded by means of a ring head, comprising: differentiating means for differentiating a signal reproduced by a ring head from the single layer film medium; detecting means for detecting a logic value of the differentiation signal from said differentiating means; and correcting means for correction, when two successive results of detection of first and second successive logic values by said detecting means present the logic value 1, the first logic value to 0.
Claim 5
Dependent Claim
49 words
A data reproducing apparatus as claimed in claim 2, further comprising storage means for temporarily storing therein the differentiation signal from said differentiating means at least for one clock period, said detecting means comparing the differentiation signal from said differentiating means with the signal stored in said storage means.
Claim 6
Dependent Claim
35 words
A data reproducing apparatus as claimed in claim 3, wherein said detecting means includes means for three-value detecting the signals from said differentiating means and said storage means and compares the thus three-value detected signals.
References Cited (Backward Citations)
US3927401A
Cited
US4323931A
Cited
US4481548A
Cited
US4346411A
Cited
US4533964A
Cited
US4482927A
Cited
US4546393A
Cited
US4544961A
Cited
US4618941A
Cited
US4544963A
Cited
US4719520A
Cited
US4613913A
Cited
US4566044A
Cited
US5130862A
Cited
US5255133A
Cited
US5101395A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-10-17 | 1998-04-18 | 1998-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-17 | 2002-04-18 | 2002-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-17 | 2006-04-18 | 2006-10-18 | $7700.00 | Window Closed / Lapsed |