Digital video signal recording and reproducing method and apparatus thereof

Claim 2

The digital video signal recording and reproducing method according to claim 1, wherein said digital data train recorded on said first region is separately recorded on M sloped tracks for every frame.

Claim 3

The digital video signal recording and reproducing method according to claim 2, wherein said Nth frame data is recorded on at least one horizontal track within an interval through which said magnetic tape is travelled when the Nth to (2N - 1)th frame data is recorded on said first region.

Claim 4

The digital video signal recording and reproducing method according to claim 3, wherein said travelled distance (Y) is expressed given the pitch of the sloped track as P and the angle of inclination as ϑ.

Claim 5

The digital video signal recording and reproducing method according to claim 1, wherein said digital data train recorded on said first region has a bit rate fixed in units of N frames.

Claim 6

The digital video signal recording and reproducing method according to claim 3, wherein said every Nth frame data recorded on said second region has a bit rate fixed in units of a frame.

Claim 7

The digital video signal recording and reproducing method according to claim 3, wherein a data compression ratio (CP) is expressed given the bit amount of said every Nth frame data recorded on said second region as B, the number of fixed heads as H, the parity bit amount as C, the recording wavelength of the fixed heads as λ, and the relative velocity between the fixed head and the tape as ν T .

Claim 8

The digital video signal recording and reproducing method according to claim 1, wherein the number of said fixed heads is four.

Claim 9

The digital video signal recording and reproducing method according to claim 1, wherein said every Nth frame data to be recorded on said second region is obtained by SIF-subsampling the original picture data.

Claim 10

The digital video signal recording and reproducing method according to claim 9, wherein said every Nth frame data reproduced during the variable reproduction is interpolated and displayed into the size of the original picture.

Claim 11

The digital video signal recording and reproducing method according to claim 9, wherein said every Nth frame data reproduced during the variable reproduction is displayed into the size of the sub-sampled picture.

Claim 12

The digital video signal recording and reproducing method according to claim 1, wherein said every Nth frame data reproduced during the variable reproduction is recorded in the frame memory at a recording rate of 1/mn, and said recorded data is repetitively reproduced by an integer representing the value of 30×(1/mn) per second, in which n represents the number of frames recorded on the horizontal track per unit of time and m represents the speed multiple.

Claim 13

A digital video recording and reproducing method comprising the steps of: helically scanning a first region of a magnetic tape running at a normal speed, using a plurality of rotary heads: recording a digital data train of 30 frames per second on a plurality of sloped tracks, and simultaneously picking up the digital data from at least one frame among said 30 frames: recording at least one frame of a digital data train formed of the picked-up digital data on at least one horizontal track in a second region of the magnetic tape through at least one fixed head; and reproducing the data recorded on the first region during a normal reproduction, while the magnetic tape runs at an predetermined multiple speed during a variable speed reproduction, to reproduce the data recorded on the second region.

Claim 14

A digital video recording and reproducing apparatus comprising: a plurality of rotary heads for helically scanning a first region of a magnetic tape at a predetermined rotation speed; a plurality of fixed heads for lengthwise scanning a second region of the magnetic tape; a normal recording portion which receives a digital audio/video signal, performs high efficiency encoding, error correction encoding and a channel encoding of the received signal, and supplies the encoded signal to the plurality of rotary heads; a variable speed recording portion which receives every Nth frame of the digital video signal input to the normal recording portion, performs sub-sampling, high-efficiency encoding and channel division of the input signal, performs error correction encoding and channel encoding of the respective divided channel signals and supplies the thus-processed signal to the corresponding fixed heads; a normal reproduction portion which processes the signals picked-up from the first region of the magnetic tape via the plurality of the rotary heads in the reverse manner as that of the recording procedure and restores the processed signals into the original signals, during the normal reproduction; and a variable speed reproduction portion which processes the signals picked-up from the second region of the magnetic tape via the plurality of the fixed heads in the reverse manner as that of the recording procedure and restores the processed signals into the original signals, during the variable speed reproduction.

Claim 15

The digital video recording and reproducing apparatus according to claim 14, wherein said variable speed recording portion comprises a source input format (SIF) sub-sampler for sub-sampling the input signal.

Claim 16

The digital video recording and reproducing apparatus according to claim 14, wherein said tape is half-loaded to a fixed head during the variable speed reproduction.

Claim 17

The digital video recording and reproducing apparatus according to claim 15, wherein said variable speed reproduction portion comprises an interpolator for restoring the SIF-subsampled signal into the size of the original picture.

Claim 18

The digital video recording and reproducing apparatus according to claim 14, wherein said variable speed reproduction portion further comprises video output means which records the restored signal in the frame memory at a recording rate of 1/mn, and the written signal is repetitively read by an integer multiple representing the value of 30×(1/mn) per second, in which n represents the number of frames recorded on the horizontal track per unit of time, and m represents the speed multiple.

Claim 19

The digital video recording and reproducing apparatus according to claim 18, wherein said video output means comprises: an input switch for switching the restored signal in units of a frame; a pair of frame memories on which the frame-unit restored signal supplied via said input switch is written at said recording rate and from which the written signal is read by said integer multiple value, and which function alternately with respect to each other; and an output switch for operating in units of a frame in the opposite manner of said input switch, so as to alternately output the signals read from said pair of frame memories.