US4597020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital video tape recorder apparatus
Assignee: Sony Corp
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Filing: 1984-04-27
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Granted: 1986-06-24
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Expires: 2004-04-27
Abstract
Abstract Digital video tape recorder apparatus comprises, at the recording side, a field store controlled by a programmable read-only memory to shuffle samples making up a digital television signal prior to recording, the shuffling alternating between a first and a second predetermined manner field by field of the television signal. At the reproducing side of the apparatus a reverse de-shuffling process is carried out.
Inventors
- 👤 James H. Wilkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:26
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N19/00; H04N19/85; H04N5/926
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
84 words
A digital video tape recorder apparatus comprising sample shuffling means for shuffling the samples making up a digital television signal prior to recording of said samples and for de-shuffling said samples subsequent to reproduction, said sample shuffling means operating to shuffle said samples to be recorded in a first predetermined manner for a first period of said television signal and in a second predetermined manner, different from said first predetermined manner, for a second period, equal to said first period, of said television signal.
Claim 2
Dependent Claim
84 words
A digital video tape recorder apparatus comprising sample shuffling means for shuffling the samples making up a digital television signal prior to recording of said samples and for de-shuffling said samples subsequent to reproduction, said sample shuffling means operating to shuffle said samples to be recorded in a first predetermined manner for a first period of said television signal and in a second predetermined manner, different from said first predetermined manner, for a second period, equal to said first period, of said television signal.
Claim 3
Dependent Claim
29 words
Apparatus according to claim 1 wherein said shuffling alternates between said first predetermined manner and said second predetermined manner field by field of said television signal to be recorded.
Claim 4
Dependent Claim
48 words
Apparatus according to claim 1 comprising, at the recording side of the apparatus, a first field store into which said samples to be recorded are written or from which said samples to be recorded are read under control of a first programmable read-only memory which effects said shuffling.
Claim 5
Dependent Claim
54 words
Apparatus according to claim 3 comprising, at the reproducing side of the apparatus, a second field store into which said shuffled samples are written or from which said samples are read under control of a second programmable read only memory which effects de-shuffling to reverse the shuffling effected by said first programmable read-only memory.
Claim 6
Dependent Claim
38 words
Apparatus according to claim 1 comprising a video tape recorder for recording said television signal in skew tracks of a magnetic tape, an integral number of said tracks being used to record each field of said television signal.
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) | 1989-06-23 | 1989-12-23 | 1990-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-23 | 1993-12-23 | 1994-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-23 | 1997-12-23 | 1998-06-24 | $7700.00 | Window Closed / Lapsed |