US4875111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for reproducing a digital signal
Assignee: Sony Corp
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Filing: 1987-08-19
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Granted: 1989-10-17
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Expires: 2007-08-19
Abstract
Abstract In an apparatus for reproducing a digital signal wherein a signal is read by a plurality of reproducing rotary heads which trace a track with an interval narrower than the interval of tracks formed on a tape, a wrap angle with which a tape is wrapped around the periphery of a rotary drum to which the rotary heads are attached is selected to be less than 360°/n with respect to the number n (n is an integer) of rotary heads, the rotary heads are rotated at a speed twice the normal rotational speed of the heads, the demodulated digital signal is stored in a memory corresponding to a frame address and a block address detected from the reproduced digital signal, and then the digital signal stored in the memory is read out therefrom in a predetermined order, whereby an apparatus for correcting the tracking of the tape by the rotary heads can be eliminated.
Inventors
- 👤 Kentaro Odaka
- 👤 Tadashi Fukami
- 👤 Shinya Ozaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:34
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B15/00; G11B15/18; G11B15/1808; G11B15/1875; G11B15/46; G11B15/467; G11B15/4671; G11B15/4672; G11B20/10527; G11B27/00; G11B27/005; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B27/3027; G11B27/3063; G11B5/00; G11B5/008; G11B5/00813; G11B5/00847; G11B5/0086; G11B5/48; G11B5/52; G11B5/53; G11B5/531; G11B5/534; G11B2220/00; G11B2220/90; G11B2220/91; G11B2220/913
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
137 words
Apparatus for reproducing a digital signal recorded in a track formed on a tape by a recording apparatus having rotary head rotating at a predetermined speed and mounted on a rotary drum having a predetermined diameter, the reproducing apparatus comprising: a rotary drum; n rotary heads mounted on the rotary drum, where n is an integer; driving means for rotating said n rotary heads at a speed at least twice the predetermined rotation speed of the rotary head of the recording apparatus; guiding means for wrapping the tape on the periphery of the rotary drum with a wrap angle of 360°/n; and demodulating means connected to the rotary heads and supplied with all digital signals reproduced by said n rotary heads during each rotation of each of the rotary heads and for demodulating the reproduced digital signals.
Claim 2
Dependent Claim
137 words
Apparatus for reproducing a digital signal recorded in a track formed on a tape by a recording apparatus having rotary head rotating at a predetermined speed and mounted on a rotary drum having a predetermined diameter, the reproducing apparatus comprising: a rotary drum; n rotary heads mounted on the rotary drum, where n is an integer; driving means for rotating said n rotary heads at a speed at least twice the predetermined rotation speed of the rotary head of the recording apparatus; guiding means for wrapping the tape on the periphery of the rotary drum with a wrap angle of 360°/n; and demodulating means connected to the rotary heads and supplied with all digital signals reproduced by said n rotary heads during each rotation of each of the rotary heads and for demodulating the reproduced digital signals.
Claim 3
Dependent Claim
95 words
Apparatus for reproducing a digital signal as claimed in claim 1, further comprising: detecting means for detecting a block address contained in each block and a frame address contained in a block at every predetermined number of blocks from a plurality of blocks forming the digital signal recorded in the track on the tape; means for storing a demodulated digital signal of each block in a memory corresponding to the block address and the frame address detected by said detecting means; and means for reading the stored digital data from said memory in predetermined order.
Claim 4
Dependent Claim
40 words
Apparatus for reproducing a digital signal as claimed in claims 1 or 2, wherein the number of said rotary heads is two, and said guiding means wraps the tape with a wrap angle of approximately 180° for said rotary drum.
Claim 5
Dependent Claim
41 words
Apparatus for reproducing a digital signal as claimed in claims 1 or 2 wherein the diameter of said rotary drum of the reproducing apparatus is selected to be half of the size of the diameter of the recording apparatus' rotary drum.
Claim 6
Dependent Claim
29 words
Apparatus for reproducing a digital signal as claimed in claim 4, wherein said rotary drum has a diameter of approximately 15 mm and is rotated at approximately 4000 rpm.
Claim 7
Dependent Claim
101 words
Apparatus for reproducing a digital signal recorded in a track formed on a tape by a rotary head rotating at a predetermined speed, comprising: a rotary drum; n rotary heads mounted on the rotary drum, where n is an integer; driving means for rotating said n rotary heads at a speed twice the predetermined rotational speed of the rotary recording head; guiding means for wrapping the tape on the periphery of the rotary drum with a wrap angle of 360°/n; and demodulating means supplied with all digital signals reproduced by said n rotary heads and for demodulating the reproduced digital signals.
Claim 8
Dependent Claim
101 words
Apparatus for reproducing a digital signal recorded in a track formed on a tape by a rotary head rotating at a predetermined speed, comprising: a rotary drum; n rotary heads mounted on the rotary drum, where n is an integer; driving means for rotating said n rotary heads at a speed twice the predetermined rotational speed of the rotary recording head; guiding means for wrapping the tape on the periphery of the rotary drum with a wrap angle of 360°/n; and demodulating means supplied with all digital signals reproduced by said n rotary heads and for demodulating the reproduced digital signals.
Claim 9
Dependent Claim
147 words
Apparatus for reproducing a digital signal recorded in a track formed on a tape by a recording apparatus having rotary head rotating at a predetermined speed and mounted on a rotary drum having a predetermined diameter, the reproducing apparatus comprising: a rotary drum; 2 m rotary heads mounted on the rotary drum, where m is an integer; driving means for rotating said 2 m rotary heads at a speed twice the rotational speed of the rotary head of the recording apparatus; guiding means for wrapping the tape on the periphery of the rotary drum with a wrap angle of 2k/m; where K is a normal reference rotational speed of the drum; and demodulating means connected to the rotary heads and supplied with all digital signals reproduced by said 2 m rotary heads during each rotation of each of the rotary heads for demodulating the reproducing digital signals.
Claim 10
Dependent Claim
147 words
Apparatus for reproducing a digital signal recorded in a track formed on a tape by a recording apparatus having rotary head rotating at a predetermined speed and mounted on a rotary drum having a predetermined diameter, the reproducing apparatus comprising: a rotary drum; 2 m rotary heads mounted on the rotary drum, where m is an integer; driving means for rotating said 2 m rotary heads at a speed twice the rotational speed of the rotary head of the recording apparatus; guiding means for wrapping the tape on the periphery of the rotary drum with a wrap angle of 2k/m; where K is a normal reference rotational speed of the drum; and demodulating means connected to the rotary heads and supplied with all digital signals reproduced by said 2 m rotary heads during each rotation of each of the rotary heads for demodulating the reproducing digital signals.
Claim 11
Independent Claim
78 words
A method for reproducing a digital signal recorded in a track formed on a tape by a rotary head, comprising the steps of: wrapping the tape on the periphery of a rotary drum with a wrap angle of 360°/n; rotating n, where n is an integer, rotary heads mounted on the drum at a speed of approximately 4000 rpm. to scan the wrapped tape; and sequentially demodulating the digital signals reproduced by each of said n rotary heads.
Claim 12
Independent Claim
78 words
A method for reproducing a digital signal recorded in a track formed on a tape by a rotary head, comprising the steps of: wrapping the tape on the periphery of a rotary drum with a wrap angle of 360°/n; rotating n, where n is an integer, rotary heads mounted on the drum at a speed of approximately 4000 rpm. to scan the wrapped tape; and sequentially demodulating the digital signals reproduced by each of said n rotary heads.
Claim 13
Dependent Claim
200 words
Apparatus for reproducing a digital signal recorded in a track formed on a tape by a rotary head rotating at a predetermined speed, said digital signal consisting of a plurality of blocks, each block having a block address and a frame address, said apparatus comprising: a rotary drum; n rotary heads mounted on the rotary drum, where n is an integer; driving means for rotating said n rotary heads at a speed at least twice the predetermined speed, so that each rotary head is traced with an interval half that of the track recorded on the tape; guiding means for wrapping the tape on the periphery of the rotary drum with a wrap angle of 360°/n; demodulating means connected to the rotary heads and supplied with all digital signals reproduced by said n rotary heads during each rotation of each of the rotary heads and for demodulating the reproduced digital signals; means for generating said block addresses and said frame addresses; and memory means for storing said demodulated digital signal blocks in accordance with said generated block addresses and frame addresses, and for reading said stored blocks in accordance with a predetermined sequence of said block addresses and frame addresses.
Claim 14
Dependent Claim
200 words
Apparatus for reproducing a digital signal recorded in a track formed on a tape by a rotary head rotating at a predetermined speed, said digital signal consisting of a plurality of blocks, each block having a block address and a frame address, said apparatus comprising: a rotary drum; n rotary heads mounted on the rotary drum, where n is an integer; driving means for rotating said n rotary heads at a speed at least twice the predetermined speed, so that each rotary head is traced with an interval half that of the track recorded on the tape; guiding means for wrapping the tape on the periphery of the rotary drum with a wrap angle of 360°/n; demodulating means connected to the rotary heads and supplied with all digital signals reproduced by said n rotary heads during each rotation of each of the rotary heads and for demodulating the reproduced digital signals; means for generating said block addresses and said frame addresses; and memory means for storing said demodulated digital signal blocks in accordance with said generated block addresses and frame addresses, and for reading said stored blocks in accordance with a predetermined sequence of said block addresses and frame addresses.
Claim 15
Dependent Claim
32 words
Apparatus for reproducing a digital signal as claimed in claim 9, wherein said memory means has a capacity larger than the capacity for storing said digital signal block recorded in four tracks.
References Cited (Backward Citations)
US3157738A
Cited
DE1474487A1
Cited
US4346397A
Cited
US4282551A
Cited
US4510538A
Cited
US4544958A
Cited
EP0115699A1
Cited
US4626932A
Cited
US4628373A
Cited
US4617599A
Cited
US4670796A
Cited
US4675754A
Cited
EP0178905A2
Cited
EP0178589A2
Cited
EP0191469A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-16 | 1993-04-17 | 1993-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-16 | 1997-04-17 | 1997-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-16 | 2001-04-17 | 2001-10-17 | $7700.00 | Window Closed / Lapsed |