Patent EP0177231A2 successfully refreshed from Google Patents.
EP0177231A2
Expired / Lapsed
EP
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Digital video recording
Assignee: Sony Corp
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Filing: 1985-09-19
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Granted: —
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Expires: 2005-09-19
Abstract
Abstract A method of recording and reproducing a digital video signal, the method comprising recording the video signal in oblique tracks on a magnetic tape (6) using a four-head digital video tape recorder, the four heads (a, b, c, d) being arranged in two head pairs (1, 2) disposed on diametrically opposite sides of a rotary head drum (3), and the video data relating to each field being distributed evenly between the four heads (a, b, c, d) for recording, each oblique track comprising two half-tracks (11. 12) separated by a central gap (13) in which audio data (14) may be recorded, and each field occupying a plurality of successively recorded pairs of half-tracks (11, 12) with each field boundary located at a central gap (13), and reproducing the video signal at a speed different from the normal reproduction speed using dynamic tracking (4, 5) by successively reproducing two half-tracks (21, 22) from the first part of a first pair of adjacent oblique tracks, then jumping to reproduce two half-tracks (27, 28) from the second part of a second pair of adjacent oblique tracks adjacent to the first pair and so on until all the data of one field has been reproduced, and then jumping to another field.
Inventors
- 👤 John Goodwin Spencer Ive
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 13:16
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/78; H04N5/782; G; G11; G11B; G11B15/00; G11B15/18; G11B15/1808; G11B15/1875; G11B27/00; G11B27/005; G11B5/00; G11B5/008; G11B5/00813; G11B5/00847; G11B5/0086; H04N5/783; H04N5/91; H04N5/93; H04N5/937; H04N9/00; H04N9/79; H04N9/80; H04N9/802; G11B2220/00; G11B2220/90
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
247 words
A method of recording and reproducing a digital video signal, the method being characterised by: recording said video signal in oblique tracks on a magnetic tape (6) using four recording heads (a, b, c, d) arranged in two head pairs (1, 2) disposed on diametrically opposite sides of a rotary head drum (3), the video data relating to each field being distributed evenly between the four heads (a, b, c, d) for recording; each said oblique track comprising two half-tracks (11, 12) separated by a central gap (13), and each field occupying a plurality of successively recorded pairs of half-tracks (21, 22; 27, 28) with each field boundary located at a said central gap (13); and reproducing said video signal at a speed different from the normal reproduction speed using four reproducing heads (a, b, c, d) provided with dynamic tracking (4, 5) and arranged in two head pairs (1, 2) disposed on diametrically opposite sides of a rotary head drum (3), by successively reproducing two said half-tracks (21, 22) from the first part of a first pair of adjacent oblique tracks, then jumping to reproduce two said half-tracks (27, 28) from the second part of a second pair of adjacent oblique tracks adjacent to said first pair and so on until all the data of one field has been reproduced, and then jumping to another field, each said reproducing head pair making said field jump when it is out of contact with said magnetic tape (6).
Claim 2
Independent Claim
247 words
A method of recording and reproducing a digital video signal, the method being characterised by: recording said video signal in oblique tracks on a magnetic tape (6) using four recording heads (a, b, c, d) arranged in two head pairs (1, 2) disposed on diametrically opposite sides of a rotary head drum (3), the video data relating to each field being distributed evenly between the four heads (a, b, c, d) for recording; each said oblique track comprising two half-tracks (11, 12) separated by a central gap (13), and each field occupying a plurality of successively recorded pairs of half-tracks (21, 22; 27, 28) with each field boundary located at a said central gap (13); and reproducing said video signal at a speed different from the normal reproduction speed using four reproducing heads (a, b, c, d) provided with dynamic tracking (4, 5) and arranged in two head pairs (1, 2) disposed on diametrically opposite sides of a rotary head drum (3), by successively reproducing two said half-tracks (21, 22) from the first part of a first pair of adjacent oblique tracks, then jumping to reproduce two said half-tracks (27, 28) from the second part of a second pair of adjacent oblique tracks adjacent to said first pair and so on until all the data of one field has been reproduced, and then jumping to another field, each said reproducing head pair making said field jump when it is out of contact with said magnetic tape (6).
Claim 3
Dependent Claim
21 words
A method according to claim 1 wherein at least some of said field jumps involve omission of at least one field.
Claim 4
Dependent Claim
25 words
A method according to claim 1 or claim 2 wherein a respective block of audio data (14) is recorded in each said central gap (13).
Claim 5
Dependent Claim
22 words
A method according to claim 1, claim 2 or claim 3 wherein said reproduced data is supplied to a field store (7).
Claim 6
Independent Claim
33 words
A method according to any one of the preceding claims wherein said digital video signal relates to a 525 lines per frame, 60 fields per second television system, and said plurality is ten.
Claim 7
Dependent Claim
36 words
6 . A method according to any one of claims 1 to 4 wherein said digital video signal relates to a 625 lines per frame, 50 fields per second television system, and said plurality is twelve.
Claim 8
Dependent Claim
120 words
A magnetic tape (6) having a digital video signal of a 525 lines per frame, 60 fields per second television system recorded thereon, the video signal having been recorded in oblique tracks on the magnetic tape (6) using a digital video tape recorder, characterised by the video data relating to each field having been distributed evenly between four heads (a, b, c, d) for recording, each said oblique track comprising two half-tracks (11, 12) separated by a central gap (13), each field occupying ten successively recorded pairs of half-tracks (21, 22; 27, 28) with each field boundary located at a said central gap (13), and a respective block of audio data having been recorded in each said central gap (13).
Claim 9
Dependent Claim
120 words
A magnetic tape (6) having a digital video signal of a 525 lines per frame, 60 fields per second television system recorded thereon, the video signal having been recorded in oblique tracks on the magnetic tape (6) using a digital video tape recorder, characterised by the video data relating to each field having been distributed evenly between four heads (a, b, c, d) for recording, each said oblique track comprising two half-tracks (11, 12) separated by a central gap (13), each field occupying ten successively recorded pairs of half-tracks (21, 22; 27, 28) with each field boundary located at a said central gap (13), and a respective block of audio data having been recorded in each said central gap (13).
Claim 10
Dependent Claim
119 words
A magnetic tape (6) having a digital video signal of a 625 lines per frame, 50 fields per second television system recorded thereon, the video signal having been recorded in oblique tracks on the magnetic tape (6) using a digital video tape recorder, characterised by the video data relating to each field having been distributed evenly between four heads (a, b, c, d) for recording, each said oblique track comprising two half-tracks (11, 12) separated by a central gap (13), and each field occupying twelve successively recorded pairs of half-tracks (21, 22; 27, 28) with each field boundary located at a said central gap (13), and a respective block of audio data recorded in each said central gap (13).
Claim 11
Dependent Claim
119 words
A magnetic tape (6) having a digital video signal of a 625 lines per frame, 50 fields per second television system recorded thereon, the video signal having been recorded in oblique tracks on the magnetic tape (6) using a digital video tape recorder, characterised by the video data relating to each field having been distributed evenly between four heads (a, b, c, d) for recording, each said oblique track comprising two half-tracks (11, 12) separated by a central gap (13), and each field occupying twelve successively recorded pairs of half-tracks (21, 22; 27, 28) with each field boundary located at a said central gap (13), and a respective block of audio data recorded in each said central gap (13).
Claim 12
Dependent Claim
237 words
Apparatus for recording and reproducing digital video signals, the apparatus being characterised by: a digital video tape recorder comprising four heads (a, b, c, d) arranged in two head pairs (1, 2) disposed on diametrically opposite sides of a rotary head drum (3); means for distributing the video data relating tu each field evenly between the four heads (a, b, c, d) for recording in oblique tracks on a magnetic tape (6); each said oblique track being recorded as two half-tracks (11, 12) separated by a central gap (3), and each field occupying a plurality of successively recorded pairs of half-tracks (21, 22; 27, 28) with each field boundary located at a said central gap (13); respective dynamic tracking arrangements (4, 5) associated with each said head pair; and means for controlling said dynamic tracking arrangements (4, 5) whereby said video signal can be reproduced at speeds different from the normal reproduction speed by successively reproducing two said half-tracks (21, 22) from the first part of a first pair of adjacent oblique tracks, then jumping to reproduce two said half-tracks (27, 28) from the second part of a second pair of adjacent oblique tracks adjacent to said first pair and so on until all the data of one field has been reproduced, and then jumping to another field, each said head pair making said field jump when it is out of contact with said magnetic tape (6).
Claim 13
Dependent Claim
237 words
Apparatus for recording and reproducing digital video signals, the apparatus being characterised by: a digital video tape recorder comprising four heads (a, b, c, d) arranged in two head pairs (1, 2) disposed on diametrically opposite sides of a rotary head drum (3); means for distributing the video data relating tu each field evenly between the four heads (a, b, c, d) for recording in oblique tracks on a magnetic tape (6); each said oblique track being recorded as two half-tracks (11, 12) separated by a central gap (3), and each field occupying a plurality of successively recorded pairs of half-tracks (21, 22; 27, 28) with each field boundary located at a said central gap (13); respective dynamic tracking arrangements (4, 5) associated with each said head pair; and means for controlling said dynamic tracking arrangements (4, 5) whereby said video signal can be reproduced at speeds different from the normal reproduction speed by successively reproducing two said half-tracks (21, 22) from the first part of a first pair of adjacent oblique tracks, then jumping to reproduce two said half-tracks (27, 28) from the second part of a second pair of adjacent oblique tracks adjacent to said first pair and so on until all the data of one field has been reproduced, and then jumping to another field, each said head pair making said field jump when it is out of contact with said magnetic tape (6).
Claim 14
Dependent Claim
24 words
Apparatus according to claim 9 further comprising means for supplying respective blocks of audio data (14) for recording in each said central gap (13).
Claim 15
Dependent Claim
21 words
Apparatus according to claim 9 or claim 10 further comprising a field store (7) to which said reproduced data is supplied.
Claim 16
Dependent Claim
216 words
Apparatus for recording and reproducing digital video signals, the apparatus being characterised by: a digital video tape recorder comprising a plurality of heads (a, b, c, d) disposed around a rotary head drum (3); means for distributing the video data relating to each field between said heads (a, b, c, d) for recording in oblique tracks on a magnetic tape (6); each said oblique track being recorded as two half-tracks (11, 12) separated by a central gap (13), and each field occupying a plurality of successively recorded half-tracks (21, 22; 27, 28) with each field boundary located at a said central gap (13); respective dynamic tracking arrangements (4, 5) associated with each said head(a, b, c, d); and means for controlling said dynamic tracking arrangements (4, 5) whereby said video signal can be reproduced at speeds different from the normal reproduction speed by successively reproducing a said half-track (21) from the first part of a first oblique track, then jumping to reproduce a said half-track (23) from the second part of a second oblique track and so on until all the data of one field has been reproduced, and then jumping to another field, each said head (a, b, c, d) making said field jump when it is out of contact with said magnetic tape (6).
Claim 17
Dependent Claim
216 words
Apparatus for recording and reproducing digital video signals, the apparatus being characterised by: a digital video tape recorder comprising a plurality of heads (a, b, c, d) disposed around a rotary head drum (3); means for distributing the video data relating to each field between said heads (a, b, c, d) for recording in oblique tracks on a magnetic tape (6); each said oblique track being recorded as two half-tracks (11, 12) separated by a central gap (13), and each field occupying a plurality of successively recorded half-tracks (21, 22; 27, 28) with each field boundary located at a said central gap (13); respective dynamic tracking arrangements (4, 5) associated with each said head(a, b, c, d); and means for controlling said dynamic tracking arrangements (4, 5) whereby said video signal can be reproduced at speeds different from the normal reproduction speed by successively reproducing a said half-track (21) from the first part of a first oblique track, then jumping to reproduce a said half-track (23) from the second part of a second oblique track and so on until all the data of one field has been reproduced, and then jumping to another field, each said head (a, b, c, d) making said field jump when it is out of contact with said magnetic tape (6).
References Cited (Backward Citations)
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