US5327124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of secondary modulation of a train of recorded data
Assignee: Pioneer Corp
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Filing: 1993-02-11
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Granted: 1994-07-05
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Expires: 2013-02-11
Abstract
Abstract A secondary modulation method which replaces any bit excluding the leading bit of consecutive five or more ones in an odd-numbered bit pattern of a train of RLL-modulated data, with a zero to provide a modulated bit pattern having no consecutive zeros. It is therefore possible to form marks of a given width on a disk without any mark edge shift, thus preventing the level of the waveform of a signal read from a disk from falling below the slice level at the position where the waveform of the read signal should show "1". This can ensure the proper data reproduction.
Inventors
- 👤 Kyota Funamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:31
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/10009; G11B20/10046; G11B20/10212; G11B20/14; G11B20/1403; G11B20/1423; G11B20/1426; G11B7/00; G11B7/004; G11B7/0045
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
78 words
A secondary modulation method of performing secondary modulation on a train of data carried out with run length limited modulation to be recorded on a recording medium, said method comprising a step of: replacing any bit excluding a leading bit of consecutive five or more ones in a bit pattern of said train of data, with a zero to provide a modulated bit pattern having no consecutive zeros, when said train of data has an odd-numbered bit pattern.
Claim 2
Dependent Claim
78 words
A secondary modulation method of performing secondary modulation on a train of data carried out with run length limited modulation to be recorded on a recording medium, said method comprising a step of: replacing any bit excluding a leading bit of consecutive five or more ones in a bit pattern of said train of data, with a zero to provide a modulated bit pattern having no consecutive zeros, when said train of data has an odd-numbered bit pattern.
Claim 3
Dependent Claim
36 words
The method according to claim 1, wherein a bit width of at least consecutive bits of ones in a train of data after modulation to have a bit pattern with no consecutive zeros is made narrower.
References Cited (Backward Citations)
US4413251A
Cited
US4617552A
Cited
US4626826A
Cited
US5012240A
Cited
US5047767A
Cited
US5200979A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-04 | 1998-01-03 | 1998-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-04 | 2002-01-03 | 2002-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-04 | 2006-01-03 | 2006-07-05 | $7700.00 | Window Closed / Lapsed |