US5434677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital video signal reproducing apparatus with high-speed play mode
Assignee: Sony Corp
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Filing: 1993-12-23
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Granted: 1995-07-18
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Expires: 2013-12-23
Abstract
Abstract Apparatus for reproducing digital video signals from a magnetic tape, wherein a frame of digital video signals had been recorded in 2 m tracks (m is an integer greater than 1), in which a pair of rotary heads having respectively different azimuth angles scan traces across the magnetic tape, such traces substantially coinciding with the tracks when the magnetic tape is transported at a speed equal to the recording speed. The magnetic tape is transported at a high speed equal to (mxn+/-l) times the recording speed, where n is an integer greater than 0, l=0.5 when the pair of heads are arranged as a double azimuth head assembly and l=0.25 when the heads are angularly separated by 180 DEG .
Inventors
- 👤 Yuka Oikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:46
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; H; H04; H04N; H04N21/00; H04N21/20; H04N21/23; H04N21/236; G11B15/00; G11B15/02; G11B15/12; G11B15/125; G11B15/18; G11B15/1808; G11B15/1875; G11B15/46; G11B15/467; G11B5/008; G11B5/00813; G11B5/00878; G11B5/48; G11B5/52; G11B5/53; H04N19/00; H04N19/85; H04N21/40; H04N21/43; H04N21/432; H04N21/4325; H04N21/434; H04N5/00; H04N5/76; H04N5/78; H04N5/782; H04N5/783; H04N9/00; H04N9/79; H04N9/80; H04N9/804; H04N9/8042; H04N9/8047; H04N5/7824; H04N5/7826; H04N5/78263; H04N5/78266; H04N5/91; H04N5/917; H04N5/919; H04N9/87; H04N9/88; H04N9/888; H04N9/89; H04N9/896
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
147 words
Apparatus for reproducing digital video signals from a magnetic tape, wherein a frame of digital video signals had been recorded in 2 m tracks (m is an integer greater than 1) when said magnetic tape was transported at a first speed, comprising: a pair of rotary heads having respectively different azimuth angles for scanning traces across said magnetic tape, said heads being constructed either as a double azimuth head assembly or as a pair of heads angularly separated by 180°, said traces substantially coinciding with said tracks when said magnetic tape is transported at said first speed; and tape transport means for transporting said magnetic tape at a second speed equal to (m×n±l) times said first speed, where n is an integer other than zero, l=0.5 when said pair of heads comprise said double azimuth head assembly and l=0.25 when said heads are angularly separated by 180°.
Claim 2
Dependent Claim
147 words
Apparatus for reproducing digital video signals from a magnetic tape, wherein a frame of digital video signals had been recorded in 2 m tracks (m is an integer greater than 1) when said magnetic tape was transported at a first speed, comprising: a pair of rotary heads having respectively different azimuth angles for scanning traces across said magnetic tape, said heads being constructed either as a double azimuth head assembly or as a pair of heads angularly separated by 180°, said traces substantially coinciding with said tracks when said magnetic tape is transported at said first speed; and tape transport means for transporting said magnetic tape at a second speed equal to (m×n±l) times said first speed, where n is an integer other than zero, l=0.5 when said pair of heads comprise said double azimuth head assembly and l=0.25 when said heads are angularly separated by 180°.
Claim 3
Dependent Claim
43 words
The apparatus of claim 1 wherein n is a positive number when said tape transport means transports said magnetic tape in a forward direction and n is a negative number when said tape transport means transports said magnetic tape in a reverse direction.
Claim 4
Dependent Claim
16 words
The apparatus of claim 1 wherein said digital video signals are NTSC video signals and m=5.
Claim 5
Dependent Claim
16 words
The apparatus of claim 1 wherein said digital video signals are PAL video signals and m=6.
Claim 6
Dependent Claim
13 words
The apparatus of claim 1 wherein n is an odd integer when l=0.25.
Claim 7
Dependent Claim
28 words
The apparatus of claim 1 wherein the frame of digital video signals recorded in said 2 m tracks are orthogonally transformed video signals encoded in variable length code.
Claim 8
Dependent Claim
15 words
The apparatus of claim 6 wherein said variable length code is a two-dimension Huffman code.
Claim 9
Dependent Claim
16 words
The apparatus of claim 6 wherein the orthogonally transformed video signals of a frame are shuffled.
Claim 10
Dependent Claim
153 words
Apparatus for reproducing digital video signals from a magnetic tape, wherein a frame of digital video signals had been recorded in 2 m tracks (m is an integer greater than 1) when said magnetic tape was transported at a first speed, each frame having been divided into blocks of picture elements and the blocks of a frame having been recorded in shuffled form with respect to each other, said apparatus exhibiting a data read-out rate and comprising: a pair of rotary heads angularly separated from each other by 180° and admitting of respectively different azimuth angles; and tape transport means for transporting said magnetic tape at a second speed equal to (m×n±l) times said first speed, where n is an odd integer, l=0.25 when said apparatus exhibits a data read-out rate determined to be at least 50% and l=0.125 when said apparatus exhibits a data read-out rate determined to be less than 50%.
Claim 11
Dependent Claim
153 words
Apparatus for reproducing digital video signals from a magnetic tape, wherein a frame of digital video signals had been recorded in 2 m tracks (m is an integer greater than 1) when said magnetic tape was transported at a first speed, each frame having been divided into blocks of picture elements and the blocks of a frame having been recorded in shuffled form with respect to each other, said apparatus exhibiting a data read-out rate and comprising: a pair of rotary heads angularly separated from each other by 180° and admitting of respectively different azimuth angles; and tape transport means for transporting said magnetic tape at a second speed equal to (m×n±l) times said first speed, where n is an odd integer, l=0.25 when said apparatus exhibits a data read-out rate determined to be at least 50% and l=0.125 when said apparatus exhibits a data read-out rate determined to be less than 50%.
Claim 12
Dependent Claim
43 words
The apparatus of claim 9 wherein n is a positive number when said tape transport means transports said magnetic tape in a forward direction and n is a negative number when said tape transport means transports said magnetic tape in a reverse direction.
Claim 13
Dependent Claim
15 words
The apparatus of claim 9 wherein said digital video signals are NTSC signals and m=5.
Claim 14
Dependent Claim
15 words
The apparatus of claim 9 wherein said digital video signals are PAL signals and m=6.
Claim 15
Dependent Claim
28 words
The apparatus of claim 9 wherein the frame of digital video signals recorded in said 2 m tracks are orthogonally transformed video signals encoded in variable length code.
Claim 16
Dependent Claim
15 words
The apparatus of claim 13 wherein said variable length code is a two-dimension Huffman code.
Claim 17
Dependent Claim
156 words
Apparatus for reproducing digital video signals from a magnetic tape, wherein a frame of digital video signals had been recorded in 2 m tracks (m is an integer greater than 1) when said magnetic tape was transported at a recording speed, each frame having been divided into blocks of picture elements and the blocks of a frame having been recorded in shuffled form with respect to each other, said apparatus exhibiting a data read-out rate and comprising: a pair of rotary magnetic heads disposed in a double azimuth head assembly and admitting of respectively different azimuth angles; and tape transport means for transporting said magnetic tape at a fast playback speed equal to (m×n±l) times said recording speed, where n is an integer other than zero, l=0.5 when said apparatus exhibits a data read-out rate determined to be at least 50% and l=0.25 when said apparatus exhibits data read-out rate determined to be less than 50%.
Claim 18
Dependent Claim
156 words
Apparatus for reproducing digital video signals from a magnetic tape, wherein a frame of digital video signals had been recorded in 2 m tracks (m is an integer greater than 1) when said magnetic tape was transported at a recording speed, each frame having been divided into blocks of picture elements and the blocks of a frame having been recorded in shuffled form with respect to each other, said apparatus exhibiting a data read-out rate and comprising: a pair of rotary magnetic heads disposed in a double azimuth head assembly and admitting of respectively different azimuth angles; and tape transport means for transporting said magnetic tape at a fast playback speed equal to (m×n±l) times said recording speed, where n is an integer other than zero, l=0.5 when said apparatus exhibits a data read-out rate determined to be at least 50% and l=0.25 when said apparatus exhibits data read-out rate determined to be less than 50%.
Claim 19
Dependent Claim
42 words
The apparatus of claim 15 wherein n is a positive number when said tape transport means transports said magnetic tape in a forward direction and n is a negative number when said transport means transports said magnetic tape in a reverse direction.
Claim 20
Dependent Claim
15 words
The apparatus of claim 15 wherein said digital video signals are NTSC signals and m=5.
Claim 21
Dependent Claim
15 words
The apparatus of claim 15 wherein said digital video signals are PAL signals and m=6.
Claim 22
Dependent Claim
28 words
The apparatus of claim 15 wherein the frame of digital video signals recorded in said 2 m tracks are orthogonally transformed video signals encoded in variable length code.
Claim 23
Dependent Claim
15 words
The apparatus of claim 19 wherein said variable length code is a two-dimension Huffman code.
References Cited (Backward Citations)
US4887169A
Cited
US5065259A
Cited
EP0364986A2
Cited
US5301070A
Cited
EP0471118A1
Cited
EP0509594A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-07-17 | 1999-01-16 | 1999-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-07-17 | 2003-01-16 | 2003-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-07-17 | 2007-01-16 | 2007-07-18 | $7700.00 | Window Closed / Lapsed |