US4609907A
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Dual channel partial response system
Assignee: Hitachi Ltd
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Filing: 1984-10-31
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Granted: 1986-09-02
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Expires: 2004-10-31
Abstract
Abstract Method and apparatus is described for encoding and decoding a stream of randomly distributed binary bits representing digital data, including an encoder for encoding the bit stream to achieve a run length limited, partial response coding of the stream; a recording medium for recording the encoded stream; and a decoding system for recovering timing signals and a stream of data signals separately from the recorded stream using a first channel for decoding the recorded stream to recover a timing signal stream; therefrom; and a second channel for decoding the recorded stream to recover a stream of data signals therefrom.
Inventors
- 👤 Roy L. Adler
- 👤 Peter A. Franaszek
- 👤 Martin Hassner
- 👤 Richard C. Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:08
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/14; G11B20/1403; G11B20/1423; G11B20/1426; G06; G06T; G06T9/00; G06T9/005
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
102 words
Apparatus for encoding and decoding a stream of randomly distributed binary bits representing digital data, comprising: encoding means for encoding said stream of binary bits to achieve a run length limited, partial response coding of said stream; recording means for recording representations of said encoded stream of binary bits and recovery means for recovering timing signals and a stream of data signals from said recorded representations, comprising: first partial response decoding means for decoding said recorded representations to recover a timing signal therefrom; and second partial response decoding means for decoding said recorded representations to recover a stream of data signals therefrom.
Claim 2
Dependent Claim
102 words
Apparatus for encoding and decoding a stream of randomly distributed binary bits representing digital data, comprising: encoding means for encoding said stream of binary bits to achieve a run length limited, partial response coding of said stream; recording means for recording representations of said encoded stream of binary bits and recovery means for recovering timing signals and a stream of data signals from said recorded representations, comprising: first partial response decoding means for decoding said recorded representations to recover a timing signal therefrom; and second partial response decoding means for decoding said recorded representations to recover a stream of data signals therefrom.
Claim 3
Dependent Claim
27 words
Apparatus according to claim 1, wherein said encoding means comprises: table lookup means for encoding m unconstrained bits into n constrained bits, m being less than n.
Claim 4
Dependent Claim
25 words
Apparatus according to claim 1, wherein said first partial response decoding means comprises: table lookup means for decoding a timing signal from said recorded representations.
Claim 5
Dependent Claim
25 words
Apparatus according to claim 1, wherein said second partial response and decoding means comprises: table lookup means for decoding data signals from said recorded representations.
Claim 6
Dependent Claim
21 words
Apparatus according to claim 1, wherein said encoding means further comprises: a partial response channel having a transfer function of 1/(1+D)(1-D).
Claim 7
Dependent Claim
29 words
Apparatus according to claim 1, wherein said first partial response decoding means in combination with said recording means comprises: a partial response channel having a transfer function of (1+D).
Claim 8
Dependent Claim
29 words
Apparatus according to claim 1, wherein said second partial response decoding means in combination with said recording means comprises: a partial response channel having a transfer function of (1+D)(1-D).
Claim 9
Independent Claim
99 words
A method for encoding and decoding a stream of randomly distributed binary bits representing digital data, comprising the steps of: encoding said stream of binary bits to achieve a run length limited, partial response coding of said stream; recording representations of said encoded stream of binary bits and recovering timing signals and a stream of data signals from said recorded representations, by: decoding said recorded representations in a first partial response decoding channel to recover a timing signal therefrom and decoding said recorded representations in a second partial response decoding channel to recover a stream of data signals therefrom.
Claim 10
Independent Claim
99 words
A method for encoding and decoding a stream of randomly distributed binary bits representing digital data, comprising the steps of: encoding said stream of binary bits to achieve a run length limited, partial response coding of said stream; recording representations of said encoded stream of binary bits and recovering timing signals and a stream of data signals from said recorded representations, by: decoding said recorded representations in a first partial response decoding channel to recover a timing signal therefrom and decoding said recorded representations in a second partial response decoding channel to recover a stream of data signals therefrom.
Claim 11
Dependent Claim
25 words
A method according to claim 8, wherein said encoding step further comprises: encoding m unconstrained bits into n constrained bits, m being less than n.
Claim 12
Dependent Claim
29 words
A method according to claim 8, wherein said decoding step in a first partial response decoding channel comprises: decoding a timing signal from said recorded representations by table lookup.
Claim 13
Dependent Claim
28 words
A method according to claim 8, wherein said decoding step in a second partial response decoding channel comprises: decoding data signals from said recorded repesentations by table lookup.
Claim 14
Dependent Claim
27 words
A method according to claim 8, wherein said encoding step further comprises: encoding said data stream in a partial response channel having a transfer function of 1/(1+D)(1-D).
Claim 15
Dependent Claim
33 words
A method according to claim 8, wherein said first decoding step further comprises: decoding said recorded representations in a partial response channel having a transfer function of (1+D) to recover a timing signal.
Claim 16
Dependent Claim
32 words
A method according to claim 8, wherein said second decoding step further comprises: decoding said recorded representations in a partial response channel having a transfer function of (1+D)(1-D) to recover encoded data.
References Cited (Backward Citations)
US3622986A
Cited
US3647964A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-01 | 1990-03-03 | 1990-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-01 | 1994-03-03 | 1994-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-01 | 1998-03-03 | 1998-09-02 | $7700.00 | Window Closed / Lapsed |