US4885646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital recorder using partial response method
Assignee: Sony Corp
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Filing: 1988-09-23
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Granted: 1989-12-05
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Expires: 2008-09-23
Abstract
Abstract A digital recording and reproducing system for ME tape uses a class 4 partial-response encoder in the recording apparatus and a corresponding decoder in the reproducing apparatus. A high signal-to-noise ratio is achieved without the need for a phase equalizer.
Inventors
- 👤 Keiji Kanota
- 👤 Takahito Seki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:05
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; G11B5/09; G11B20/00; G11B20/10; G11B20/10009
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
120 words
In a digital recording-reproducing apparatus for recording and reproducing a digital signal on a metal evaporation tape by a rotary head, the combination comprising: a recording circuit for supplying a digital signal to said rotary head, said recording circuit including a class 4 partial-response encoder, an analog-to-digital converter for converting an input analog signal to a corresponding digital signal, and an M series signal generator for scrambling said digital signal; and a reproducing circuit supplied with a reproduced signal from said rotary head, said reproducing circuit including a class 4 partial-response decoder, a three-level comparator supplied with an output signal of said class 4 partial-response decoder, and a digital-to-analog converter for converting a digital signal obtained from said three-level comparator.
Claim 2
Dependent Claim
120 words
In a digital recording-reproducing apparatus for recording and reproducing a digital signal on a metal evaporation tape by a rotary head, the combination comprising: a recording circuit for supplying a digital signal to said rotary head, said recording circuit including a class 4 partial-response encoder, an analog-to-digital converter for converting an input analog signal to a corresponding digital signal, and an M series signal generator for scrambling said digital signal; and a reproducing circuit supplied with a reproduced signal from said rotary head, said reproducing circuit including a class 4 partial-response decoder, a three-level comparator supplied with an output signal of said class 4 partial-response decoder, and a digital-to-analog converter for converting a digital signal obtained from said three-level comparator.
Claim 3
Dependent Claim
28 words
A digital recording-reproducing apparatus according to claim 1, in which said reproducing circuit includes a time base corrector connected between said three level comparator and said digital-to-analog converter.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-04 | 1993-06-05 | 1993-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-04 | 1997-06-05 | 1997-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-04 | 2001-06-05 | 2001-12-05 | $7700.00 | Window Closed / Lapsed |