US 5,692,092 A · Recording and playback system for variable speed playback wherein more a.c. coefficients are allotted to the macroblocks in the central part of an image frame

Abstract

A digital VTR which is able to record a band-compressed signal having a bit-rate of 17 to 60 Mbps of a program while creating a low-bit-rate signal (1.5 to 5 Mbps) having the same program content as well as utilizing the low-bit-rate signal as a signal for the special playback. Variable speed playback data for a certain speed, which is recorded in the limited recording areas for variable-speed playback mode, is adapted to be used for playback at another speed in the variable-speed playback mode. The data structure of variable-speed playback data is adapted to change depending on the image areas on the image frame. Either of these embodiments or the combination of them, improves the quality of a reproduced picture during variable-speed playback mode in which a less amount of data is available than that of data read out at the time of a normal playback mode.

Claims32

Dependent claims

A digital recording and reproducing apparatus which records a desired video signal onto a recording medium by compressing the band range of the desired video signal using a high-efficiency coding technique, the digital recording and reproducing apparatus comprising:

means for recording part of video data for variable-speed playback onto different recording tracks from those on which video data for normal playback is recorded;
and
means for forming the video data for variable-speed playback to be recorded by extracting part of the video data for variable-speed playback from the desired video signal in such a manner that more a.c. components are allotted to a central part of an image frame than a peripheral part of the image frame such that the quality of a picture reproduced during a variable-speed playback mode is improved from the peripheral part of the image frame of the reproduced picture toward the central part thereof.

Dependencies are inferred from the claim text.

Recording and playback system for variable speed playback wherein more a.c. coefficients are allotted to the macroblocks in the central part of an image frame

Life of this patent

Recording and playback system for variable speed playback wherein more a.c. coefficients are allotted to the macroblocks in the central part of an image frame

Life of this patent

Abstract

Claims32