Patent US4467817A successfully refreshed from Google Patents.
EP0534620A2
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Apparatus and method for generating high speed dubbing signal
Assignee: Japan Broadcasting Corp
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Filing: 1992-08-27
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Granted: —
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Expires: 2012-08-27
Abstract
Abstract An apparatus for generating a high speed dubbing signal to be recorded by an external recording apparatus. The high speed dubbing signal whose pitch is N times a digital input signal is generated as follows. An encoding circuit (113) subsamples the digital input signal consisting of frame signals each of which consists of N field signals, so that each frame signal is compressed by a factor of N to be contained in one field interval. A digital signal recording and reproducing circuit (116) including a recording and reproduction system, records on a tape, at a normal tape speed and at a normal head drum rotational frequency, the compressed signal in such a manner that each field including the compressed signal appears once per frame interval, and then selectively reproduces from the tape the field including the compressed signal at the tape speed N times the normal speed and at the normal drum speed. A decoding circuit (120) interpolates the output signal of the recording and reproducing portion (116) to recover the lost information by the subsampling. An output portion produces the high speed dubbing signal based on the output of the decoding circuit (120). Since the drum rotational frequency is maintained at the normal value throughout the recording and reproduction by the recording and reproduction system, the contact between the tape and head of the system is stabilized, thereby enabling a reliable high speed dubbing.
Inventors
- 👤 Yoshinobu c/o NHK SCIENCE AND TECHNICAL Oba
- 👤 Hideo c/o NHK SCIENCE AND TECHNICAL Oshima
- 👤 Toshihiro c/o NHK SCIENCE & TECHNICAL Uehara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 23:05
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; G; G11; G11B; G11B27/00; G11B27/02; G11B27/031; G11B27/032; G11B27/036; G11B5/00; G11B5/86; H04N9/797; H04N9/80; H04N9/802; G11B2220/00; G11B2220/90
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
274 words
An apparatus for generating a high speed dubbing signal from a first digital signal consisting of frame signals, each of the frame signal consisting of N (N is an integer greater than one) field signals, said apparatus characterized by comprising: data compressing means for compressing the first digital signal by a factor of N by alternately compressing the N field signals in one frame interval so that one frame signal is compressed to one field interval, and by arranging the compressed data sequentially into one field to form a second digital signal; recording means including a head drum that rotates heads for performing helical recording of the second digital signal on a tape at a normal tape speed and at a normal drum rotational frequency in such a manner that each field of the second digital signal is recorded at one frame interval; reproduction means including a head drum that rotates heads for reproducing only the second digital signal from the tape at a tape speed N times the normal tape speed and at the normal drum rotational frequency; means for rearranging the reproduced second digital signal in such a manner that data of each field of the second digital signal are reassigned to N fields during one field interval to form a third digital signal; means for expanding the third digital signal so that data which have been compressed are recovered to generate a fourth digital signal having a pitch N times that of the first digital signal; and means for outputting the fourth digital signal as the high speed dubbing signal having the pitch N times that of the first digital signal.
Claim 2
Independent Claim
201 words
An apparatus for generating a high speed dubbing signal from a first digital signal consisting of frame signals, each of the frame signal consisting of N (N is an integer greater than one) field signals, said apparatus characterized by comprising: recording means, including N head drums each of which rotates heads, for performing helical recording of the first digital signal on N tapes at a normal tape speed and at a normal drum rotational frequency; reproduction means, including N head drums each of which rotates heads, for reproducing during one frame interval only one field signal of the first digital signal from each one of the tapes at a tape speed N times the normal tape speed and at a normal drum rotational frequency, thereby reproducing N field signals belonging to different fields during one frame interval; means for rearranging the reproduced N field signals by sequentially assigning each one of the N field signals to one field interval to form a second digital signal having a pitch N times that of the first digital signal; and means for outputting the second digital signal as the high speed dubbing signal having the pitch N times that of the first digital signal.
Claim 3
Independent Claim
28 words
An apparatus for generating a high speed dubbing signal as claimed in either claims 1 or 2, characterized in that the integer N is two, three or four.
Claim 4
Dependent Claim
51 words
An apparatus for generating a high speed dubbing signal as claimed in claim 3, characterized in that said recording means and reproduction means use said head drum and said heads in common, said heads being vertically swung so that one of every N field signals on the tape are selectively reproduced.
Claim 5
Dependent Claim
31 words
An apparatus for generating a high speed dubbing signal as claimed in claim 4, characterized in that said first digital signal is a digital video signal and a digital audio signal.
Claim 6
Independent Claim
247 words
A method for generating a high speed dubbing signal from a first digital signal consisting of frame signals, each of the frame signal consisting of N (N is an integer greater than one) field signals, said method characterized by comprising the steps of: compressing the first digital signal by a factor of N by alternately compressing the N field signals in one frame interval so that one frame signal is compressed to one field interval, and by arranging the compressed data sequentially into one field to form a second digital signal; performing helical recording of the second digital signal on a tape at a normal tape speed and at a normal drum rotational frequency in such a manner that each field of the second digital signal is recorded at one frame interval; reproducing only the second digital signal from the tape at a tape speed N times the normal tape speed and at the normal drum rotational frequency; rearranging the reproduced second digital signal in such a manner that data of each field of the second digital signal are reassigned to N fields during one field interval to form a third digital signal; expanding the third digital signal so that data which have been compressed are recovered to generate a fourth digital signal having a pitch N times that of the first digital signal; and outputting the fourth digital signal as the high speed dubbing signal having the pitch N times that of the first digital signal.
Claim 7
Independent Claim
176 words
A method for generating a high speed dubbing signal from a first digital signal consisting of frame signals, each of the frame signal consisting of N (N is an integer greater than one) field signals, said method characterized by comprising the steps of: performing helical recording of the first digital signal on N tapes at a normal tape speed and at a normal drum rotational frequency; reproducing during one frame interval only one field signal of the first digital signal from each one of the tapes at a tape speed N times the normal tape speed and at a normal drum rotational frequency, thereby reproducing N field signals belonging to different fields during one frame interval; rearranging the reproduced N field signals by sequentially assigning each one of the N field signals to one field interval to form a second digital signal having a pitch N times that of the first digital signal; and outputting the second digital signal as the high speed dubbing signal having the pitch N times that of the first digital signal.
Claim 8
Independent Claim
29 words
A method for generating a high speed dubbing signal as claimed in either of claims 6 or 7, characterized in that the integer N is two, three or four.
Claim 9
Dependent Claim
49 words
A method for generating a high speed dubbing signal as claimed in claim 8, characterized in that said steps of recording and reproduction use a common head drum and heads, said heads being vertically swung so that one of every N field signals on the tape is selectively reproduced.
Claim 10
Dependent Claim
31 words
A method for generating a high speed dubbing signal as claimed in claim 9, characterized in that said first digital signal is a digital video signal and a digital audio signal.
References Cited (Backward Citations)
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