A digital video tape recorder capable of high speed image reproduction

Claim 2

A digital video tape recorder, comprising: means for supplying digital video information (100, 200, 1); video information separating means (300) for dividing said digital video information into main information capable of roughly forming the whole image and subinformation forming details of the image to supply the same; first video information processing means (400) for carrying out error correcting process on said supplied main information; second video information processing means (500) for carrying out error correcting process on said supplied subinformation; and recording means (600) for recording outputs from said first and second video information processing means on a magnetic tape such that the output from said first video information processing means is recorded at the center of each recording track in n (n is a positive integer) field unit and the output from said second video information processing means is recorded on outer portions of said recording track on both sides of said center.

Claim 3

A digital video tape recorder according to claim 1, wherein said video information separating means includes first to mth subsampling means (2, 4, 21, 27, 33) for carrying out first to mth (m is a positive integer) subsampling process stepwise on said digital video information, and first to (m + 1) th stage data forming means (14, 10, 6, 24, 30, 35) for forming m th to 0th stage image data, respectively, based on said digital video information and on outputs from said first to mth subsampling means, and said video information separating means supplies 0th to ℓth (ℓ is 0 or a positive integer) stage image data as said main information and image data of other stages as said subinformation.

Claim 4

A digital video tape recorder according to claim 2, wherein said video information separating means includes first and second subsampling means (2, 4) and first to third stage data forming means (14, 10, 6) for forming second to 0th stage image data, respectively, and said video information separating means supplies said 0th stage image data as said main information and said first and second stage image data as said subinformation.

Claim 5

A digital video tape recorder according to claim 3, wherein said third stage data forming means includes third coding means (6) for coding an output from said second subsampling means to supply the same as the 0th stage image data, said second stage data forming means includes second coding means (10) for coding difference between an output from said first subsampling means and said 0th stage image data to supply the same as the first stage image data, and said first stage data forming means includes first coding means (14) for coding difference between said digital video information and said first stage image data to supply the same as the second stage image data.

Claim 6

A digital video tape recorder according to claim 2, wherein said video information separating means includes first to fifth subsampling means (2, 4, 21, 27, 33) and first to sixth stage data forming means (14, 10, 6, 24, 30, 35) for forming fifth to 0th stage image data, respectively, and said video information separating means supplies said 0th stage image data or said 0th and said first stage image data as said main information and image data of other stages as said subinformation.

Claim 7

A digital video tape recorder according to claim 5, wherein said sixth stage data forming means includes sixth coding means (35) for coding an output from said fifth subsampling means to supply the same as the 0th stage image data, said fifth stage data forming means includes fifth coding means (30) for coding difference between an output from said fourth subsampling means and said 0th stage image data to supply the same as the first stage image data, said fourth stage data forming means includes fourth coding means (24) for coding difference between an output from said third subsampling means and said first stage image data to supply the same as the second stage image data, said third stage data forming means includes third coding means (6) for coding difference between an output from said second subsampling means and said second stage image data to supply the same as the third stage image data, said second stage data forming means includes coding means (10) for coding difference between an output from said first subsampling means and said third stage image data to supply the same as the fourth stage image data, and said first stage data forming means includes first coding means (14) for coding difference between said digital video information and said fourth stage image data to supply the same as the fifth stage image data.

Claim 8

7 . A digital video tape recorder according to claim 1, further comprising: means (17, 18, 38) for reproducing at least said main information from said recording track while running at high speed a magnetic tape on which the outputs from said first and second video information processing means are recorded; and means (19, 39, 40, 41) for forming video information based on said reproduced main information.

Claim 9

8 . A digital video tape recorder according to claim 7, wherein the video information reproduced based on said reproduced main information is a video signal with variable rate of reduction, the digital video tape recorder further comprising means (39) for changing said rate of reduction in correspondence with amount of said reproduced main information.

Claim 10

A digital video taper recorder according to claim 8, further comprising: means (42) for supplying a signal indicative of additional information to be displayed on a margin formed around a reduced image by said video signal; and means (43) for multiplexing said video signal and said additional information signal.

Claim 11

A digital video tape recorder according to claim 1, wherein said main information is formed by fixed length coding and said subinformation is formed by variable length coding.