US5848041A
Expired / Lapsed
US
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Method and apparatus for recording digital signals medium for recording digital signals and method
Assignee: Toshiba Corp
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Filing: 1997-06-06
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Granted: 1998-12-08
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Expires: 2017-06-06
Abstract
Abstract An excellent waveform signal with less jitter is obtained as an output signal from a reproducing optical pickup, irrespective of a relative reading speed. Thus there is no need for an equalizing circuit on a reproducing apparatus side. An input bit sequence or a recording NRZI signal is combined with spatial frequency characteristics G(fs) by a G(fs) converter. An output signal from the G(fs) converter is combined with equalizing frequency characteristics EQ(fs) necessary on a reproducing side by an EQ(fs) converter. An output from the EQ(fs) converter is saturation-amplified by a saturation amplifier, thereby producing an ideally pre-jittered recording signal that has equivalent enhanced high-frequency component. The recording signal is recorded on an optical disk.
Inventors
- 👤 Koichi Hirayama
- 👤 Hiroharu Satoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:27
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/007; H; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03012; H04L25/03019; H04L25/03038; G11B20/00; G11B20/10; G11B20/10009; G11B7/004; G11B7/0045; H04L2025/03433; H04L2025/03439; H04L2025/03445; H04L2025/03471; H04L2025/03477
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
115 words
A method of recording a digital signal, the method comprising: combining an input bit sequence, which has a bit interval Pw and an interval of n×Pw to m×Pw (n<m; n and m=integers) of transition points between bit 0 and bit 1, with predetermined frequency characteristics, thereby obtaining a first signal retaining information of the interval of the bit transition points; combining said first signal with equalizing characteristics of an output signal reproduced by a reproducing pickup, thereby producing a second signal including jitters; and saturation-amplifying and second signal and converting the saturation-amplified signal to bit sequence which is a binary signal, thereby obtaining a recording signal, whereby equalization of a reproduced signal is not needed.
Claim 2
Independent Claim
115 words
A method of recording a digital signal, the method comprising: combining an input bit sequence, which has a bit interval Pw and an interval of n×Pw to m×Pw (n<m; n and m=integers) of transition points between bit 0 and bit 1, with predetermined frequency characteristics, thereby obtaining a first signal retaining information of the interval of the bit transition points; combining said first signal with equalizing characteristics of an output signal reproduced by a reproducing pickup, thereby producing a second signal including jitters; and saturation-amplifying and second signal and converting the saturation-amplified signal to bit sequence which is a binary signal, thereby obtaining a recording signal, whereby equalization of a reproduced signal is not needed.
Claim 3
Dependent Claim
16 words
The method according to claim 1, wherein said recording signal is recorded on a recording medium.
Claim 4
Independent Claim
149 words
An apparatus for recording a digital signal, comprising: first conversion means for combining an input bit sequence, which has a bit interval Pw and an interval of n×Pw to m×Pw (n<m; n and m=integers) of transition points between bit 0 and bit 1, with predetermined frequency characteristics, thereby obtaining a first signal retaining information of the interval of the bit transition points; second conversion means for combining said first signal output from said first conversion means with equalizing characteristics of an output signal reproduced by a reproducing pickup, thereby producing a second signal including jitters; third conversion means for saturation-amplifying said second signal output from said second conversion means and converting the saturation-amplified signal to a bit sequence which is a binary signal, thereby obtaining a recording signal whereby equalization of a reproduced signal is not needed; and recording means for recording the recording signal on a recording medium.
Claim 5
Independent Claim
149 words
An apparatus for recording a digital signal, comprising: first conversion means for combining an input bit sequence, which has a bit interval Pw and an interval of n×Pw to m×Pw (n<m; n and m=integers) of transition points between bit 0 and bit 1, with predetermined frequency characteristics, thereby obtaining a first signal retaining information of the interval of the bit transition points; second conversion means for combining said first signal output from said first conversion means with equalizing characteristics of an output signal reproduced by a reproducing pickup, thereby producing a second signal including jitters; third conversion means for saturation-amplifying said second signal output from said second conversion means and converting the saturation-amplified signal to a bit sequence which is a binary signal, thereby obtaining a recording signal whereby equalization of a reproduced signal is not needed; and recording means for recording the recording signal on a recording medium.
Claim 6
Dependent Claim
34 words
The apparatus according to claim 3, wherein said equalizing frequency characteristics are obtained by multiplying said predetermined frequency characteristics by a coefficient of inverse characteristics of optical frequency characteristics of said reproducing optical pickup.
Claim 7
Dependent Claim
24 words
The apparatus according to claim 3, wherein said predetermined frequency characteristics are k×100% cosine roll-off characteristics (when 0≦k≦1) with a cut-off frequency of 1/(2n×Pw).
Claim 8
Dependent Claim
16 words
The apparatus according to claim 3, wherein said recording signal is recorded on a recording medium.
Claim 9
Independent Claim
117 words
A method of transmitting a digital signal, the method comprising: combining an input bit sequence, which has a bit interval Pw and an interval of n×Pw to m×Pw (n<m; n and m=integers) of transition points between bit 0 and bit 1, with predetermined frequency characteristics, thereby producing a first signal retaining information of the interval of the bit transition points; combining said first signal with equalizing characteristics of an output signal from a reception-side high-frequency reception unit, thereby producing a second signal including jitters; and saturation-amplifying said second signal and converting the saturation-amplified signal to a bit sequence which is a binary signal, thereby obtaining a transmission signal, whereby equalization of a reproduced signal is not needed.
Claim 10
Independent Claim
117 words
A method of transmitting a digital signal, the method comprising: combining an input bit sequence, which has a bit interval Pw and an interval of n×Pw to m×Pw (n<m; n and m=integers) of transition points between bit 0 and bit 1, with predetermined frequency characteristics, thereby producing a first signal retaining information of the interval of the bit transition points; combining said first signal with equalizing characteristics of an output signal from a reception-side high-frequency reception unit, thereby producing a second signal including jitters; and saturation-amplifying said second signal and converting the saturation-amplified signal to a bit sequence which is a binary signal, thereby obtaining a transmission signal, whereby equalization of a reproduced signal is not needed.
Claim 11
Independent Claim
126 words
An apparatus for transmitting a digital signal, comprising: first means for combining an input bit sequence, which has a bit interval Pw and an interval of n×Pw to m×Pw (n<m; and n and m=integers) of transition points between bit 0 and bit 1, with predetermined frequency characteristics, thereby obtaining a first signal retaining information of the interval of the bit transition points; second means for combining said first signal output with equalizing characteristics of an output signal from a reception-side high-frequency reception unit, thereby producing a second signal including jitters; and third means for saturation-amplifying said second signal and converting the saturation-amplified signal to a bit sequence which is a binary signal, thereby obtaining a transmission signal, whereby equalization of a reproduced signal is not needed.
Claim 12
Independent Claim
126 words
An apparatus for transmitting a digital signal, comprising: first means for combining an input bit sequence, which has a bit interval Pw and an interval of n×Pw to m×Pw (n<m; and n and m=integers) of transition points between bit 0 and bit 1, with predetermined frequency characteristics, thereby obtaining a first signal retaining information of the interval of the bit transition points; second means for combining said first signal output with equalizing characteristics of an output signal from a reception-side high-frequency reception unit, thereby producing a second signal including jitters; and third means for saturation-amplifying said second signal and converting the saturation-amplified signal to a bit sequence which is a binary signal, thereby obtaining a transmission signal, whereby equalization of a reproduced signal is not needed.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-12-07 | 2002-06-08 | 2002-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-12-07 | 2006-06-08 | 2006-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-12-07 | 2010-06-08 | 2010-12-08 | $7700.00 | Window Closed / Lapsed |