← Back to Patent Explorer
US5359428A Expired / Lapsed US ⏱️ 0.0 years remaining

Digital video recorder operable in standard and long play modes

Assignee: Sony Corp
•
Filing: 1992-06-19
•
Granted: 1994-10-25
•
Expires: 2012-06-19
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract Digital video tape recording apparatus of the type which converts a vertical interval of picture data into image blocks of digital picture element data that is compression encoded and recorded on video tape which is selectively driven at first or second speeds, wherein the second speed is approximately 1.5 times faster than the first speed. The digital video recorder includes two rotatable transducers disposed approximately 180 DEG apart, each transducer having a recording gap length, or head width, for recording a track pitch, the gap length being at least equal to the track pitch that is recorded when the tape is driven at the second speed. The transducers have respectively different azimuth angles to minimize crosstalk interference during playback.

Inventors

  • 👤 Yukio Kubota
  • 👤 Yoichirou Senshu

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 20:28
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: 12
Claim 1
Independent Claim 187 words
Digital video tape recording apparatus of the type having block segmenting means for converting a vertical interval of picture data into image blocks of digital picture element data, compression encoding means for compressing the blocks of digital picture element data and generating a compression code representative thereof and recording means for recording said compression code on said magnetic tape, said apparatus comprising: selectable tape drive means for driving said magnetic tape at first or second speeds for recording said compression code, said second speed being approximately 1.5 times faster than said first speed; and first and second rotatable transducer means disposed approximately 180° apart and coupled to said recording means each for recording said compression code when said tape is driven at said first speed and when said tape is driven at said second speed each of said transducer means having a recording gap length for recording a track pitch, said gap length being at least equal to the track pitch recorded by said transducer means when said tape is driven at said second speed, and said first and second transducer means having respectively different azimuth angles.
Claim 2
Dependent Claim 187 words
Digital video tape recording apparatus of the type having block segmenting means for converting a vertical interval of picture data into image blocks of digital picture element data, compression encoding means for compressing the blocks of digital picture element data and generating a compression code representative thereof and recording means for recording said compression code on said magnetic tape, said apparatus comprising: selectable tape drive means for driving said magnetic tape at first or second speeds for recording said compression code, said second speed being approximately 1.5 times faster than said first speed; and first and second rotatable transducer means disposed approximately 180° apart and coupled to said recording means each for recording said compression code when said tape is driven at said first speed and when said tape is driven at said second speed each of said transducer means having a recording gap length for recording a track pitch, said gap length being at least equal to the track pitch recorded by said transducer means when said tape is driven at said second speed, and said first and second transducer means having respectively different azimuth angles.
Claim 3
Dependent Claim 28 words
The apparatus of claim 1 wherein said first and second transducer means record adjacent tracks, without guard bands therebetween, when said tape is driven at said second speed.
Claim 4
Dependent Claim 15 words
The apparatus of claim 1 wherein said compression encoding means includes an orthogonal transform encoder.
Claim 5
Dependent Claim 16 words
The apparatus of claim 3 wherein said orthogonal transform encoder is a discrete cosine transform encoder.
Claim 6
Dependent Claim 20 words
The apparatus of claim 1 wherein said recording means includes a channel encoder for encoding said compression code for recording.
Claim 7
Dependent Claim 14 words
The apparatus of claim 5 wherein said channel encoder comprises an adaptive scrambling circuit.
Claim 8
Dependent Claim 14 words
The apparatus of claim 6 wherein said adaptive scrambling circuit comprises M scrambling circuits.
Claim 9
Dependent Claim 21 words
The apparatus of claim 1 wherein said vertical interval of picture data comprises a field of luminance and color difference signals.
Claim 10
Dependent Claim 21 words
The apparatus of claim 1 wherein said vertical interval of picture data comprises a frame of luminance and color difference signals.
Claim 11
Dependent Claim 46 words
The apparatus of claim 1 wherein each of said first and second transducer means records 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 12
Dependent Claim 23 words
The apparatus of claim 1 wherein the recording gap length of each of said first and second transducer means is approximately 9 μm.

References Cited (Backward Citations)

US4719518A Cited
US4725896A Cited
US4905104A Cited
US4862292A Cited
US5051846A Cited
US4963992A Cited
US5032927A Cited
US5023710A Cited
US5164831A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1997-10-24 1998-04-25 1998-10-25 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2001-10-24 2002-04-25 2002-10-25 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2005-10-24 2006-04-25 2006-10-25 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag