EP0529233A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Digital video recorder operable in standard and long play modes
Assignee: Sony Corp
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Filing: 1992-06-25
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Granted: —
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Expires: 2012-06-25
Abstract
Abstract Disclosed is a digital video tape recording apparatus which converts a vertical interval of picture data into image blocks. The digital picture element data are DCT or ADRC coded (8) and recorded. The video tape is selectively driven at first or second speed, wherein the second speed is approximately 1.5 times faster than the first speed. The digital video recorder includes two rotatable transducers (13A, 13B) disposed approximately 180° apart, each having a recording gap length, or head width, for recording a track pitch. This gap length is at least equal to the track pitch that is recorded when the tape is driven at the second speed. The transducers (13A, 13B) have respectively different azimuth angles to minimize crosstalk interference during playback.
Inventors
- 👤 Yukio Kubota
- 👤 Yoichirou Senshu
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 07:14
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; H; H04; H04N; H04N9/00; H04N9/79; H04N9/7921; G11B15/00; G11B15/18; G11B15/1808; G11B15/1875; G11B15/46; G11B15/467; G11B15/4673; G11B15/4675; G11B15/4676; G11B15/4677; G11B15/4678; G11B20/10009; G11B20/18; G11B20/1833; H04N5/00; H04N5/76; H04N5/78; H04N5/782; H04N5/7824; H04N5/7826; H04N5/78263; H04N5/78266; H04N9/80; H04N9/804; H04N9/8042; H04N9/8047; H04N9/87; H04N9/88; H04N9/888
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
183 words
Digital video tape recording apparatus of the type having block segmenting means (5) for converting a vertical interval of picture data into image blocks of digital picture element data, compression encoding means (8-10) for compressing the blocks of digital picture element data and generating a compression code representative thereof and recording means (12A, 12B) for recording said compression code on said magnetic tape, said apparatus comprising: selectable tape drive means (58, 51) for driving said magnetic tape at first or second speeds for recording said compressed code, said second speed being approximately 1.5 times faster than said first speed; and first and second rotatable transducer means (13A, 13B) disposed approximately 180° apart and coupled to said recording means (12A, 12B) for recording said compressed code, each of said transducer means (13A, 13B) having a recording gap length for recording a Yack pitch, said gap length being at least equal to the track pitch recorded by said transducer means (13A, 13B) when said tape is driven at said second speed, and said first and second transducer means (13A, 13B) having respectively different azimuth angles.
Claim 2
Dependent Claim
32 words
The apparatus of Claim 1 wherein said first and second transducer means (13A, 13B) record adjacent tracks (TA, TB), without guard bands therebetween, when said tape is driven at said second speed.
Claim 3
Dependent Claim
18 words
The apparatus of Claim 1 or 2 wherein said compression encoding means (8-10) includes an orthogonal transform encoder.
Claim 4
Dependent Claim
16 words
The apparatus of Claim 3 wherein said orthogonal transform encoder is a discrete cosine transform encoder.
Claim 5
Independent Claim
25 words
The apparatus of anyone of Claims 1 to 4 wherein said recording means includes a channel encoder (11) for encoding said compression code for recording.
Claim 6
Dependent Claim
16 words
The apparatus of Claim 5 wherein said channel encoder comprises an adaptive scrambling circuit (41 ).
Claim 7
Dependent Claim
15 words
The apparatus of Claim 6 wherein said adaptive scrambling circuit (41) comprises M scrambling circuits.
Claim 8
Independent Claim
25 words
The apparatus of anyone of Claims 1 to 7 wherein said vertical interval of picture data comprises a field of luminance and color difference signals.
Claim 9
Independent Claim
25 words
The apparatus of anyone of Claims 1 to 7 wherein said vertical interval of picture data comprises a frame of luminance and color difference signals.
Claim 10
Independent Claim
59 words
The apparatus of anyone of Claims 1 to 9 wherein the recording gap length of said first and second transducer means (13A, 13B) is such as to record a track pitch of 6 µm when said tape is driven at said first speed and a track pitch of 9 µm when said tape is driven at said second speed.
Claim 11
Independent Claim
25 words
The apparatus of anyone of Claims 1 to 10 wherein the recording gap length of said first and second transducer means is approximately 9 µm.
References Cited (Backward Citations)
No citation records indexed.
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