Patent US5596559A successfully refreshed from Google Patents.
US5596559A
Expired / Lapsed
US
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Information reproducing apparatus for reproducing digital information by self-clock scheme
Assignee: Canon Inc
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Filing: 1995-04-14
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Granted: 1997-01-21
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Expires: 2015-04-14
Abstract
Abstract An information reproducing apparatus includes a reproduction clock generating device for generating a reproduction clock on the basis of a multivalue signal of a reproduction signal reproduced from an information recording medium, and a reproduction data detecting device for detecting the multivalue signal by using the reproduction clock, and for generating reproduction data synchronized with the reproduction clock. The apparatus further includes a first waveform equalizer for performing waveform equalization of the reproduction signal which is suitable for generation of the reproduction signal, and a second waveform equalizer, arranged independently of the first waveform equalizer, for performing waveform equalization of the reproduction signal which is suitable for detection of the reproduction signal.
Inventors
- 👤 Makoto Hiramatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:50
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/10009; G11B20/10046; G11B20/10055; G11B20/10101; G11B11/00; G11B11/10; G11B11/105; G11B11/10502; G11B11/10515; G11B7/00; G11B7/004; G11B7/005
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
128 words
An information reproducing apparatus including reproduction clock generating means for generating a reproduction clock on the basis of a multivalue signal of a reproduction signal reproduced from an information recording medium, and reproduction data detecting means for detecting the multivalue signal by using the reproduction clock, and generating reproduction data synchronized with the reproduction clock, comprising: first waveform equalizing means for performing waveform equalization of the reproduction signal, which is suitable for generation of the reproduction clock; and second waveform equalizing means which is provided independently of said first waveform equalizing means and has a waveform equalization characteristic different from that of said first waveform equalizing means, said second waveform equalizing means performing waveform equalization of the reproduction signal, which is suitable for detection of the reproduction data.
Claim 2
Dependent Claim
128 words
An information reproducing apparatus including reproduction clock generating means for generating a reproduction clock on the basis of a multivalue signal of a reproduction signal reproduced from an information recording medium, and reproduction data detecting means for detecting the multivalue signal by using the reproduction clock, and generating reproduction data synchronized with the reproduction clock, comprising: first waveform equalizing means for performing waveform equalization of the reproduction signal, which is suitable for generation of the reproduction clock; and second waveform equalizing means which is provided independently of said first waveform equalizing means and has a waveform equalization characteristic different from that of said first waveform equalizing means, said second waveform equalizing means performing waveform equalization of the reproduction signal, which is suitable for detection of the reproduction data.
Claim 3
Dependent Claim
16 words
An apparatus according to claim 1, wherein said reproduction clock generating means is a PLL circuit.
Claim 4
Dependent Claim
17 words
An apparatus according to claim 1, wherein said second waveform equalizing means performs partial response waveform equalization.
Claim 5
Dependent Claim
62 words
An apparatus according to claim 1, further comprising a path for transmitting the reproduction signal reproduced from the medium, the path being branched into two paths, one of which is connected to said first waveform equalizing means and said reproduction clock generating means, and the other of which is connected to said second waveform equalizing means and said reproduction data detecting means.
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) | 2000-01-21 | 2000-07-22 | 2001-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-01-21 | 2004-07-22 | 2005-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-01-21 | 2008-07-22 | 2009-01-21 | $7700.00 | Window Closed / Lapsed |