Device for transmitting or storing digital television pictures,

Details Device for transmitting or storing digital television pictures, Device for transmitting or storing digital television pictures,

1994-06-06

1996-10-29

Britton, Howard W.

Television

Bandwidth reduction system

Data rate reduction

348423, 386112, H04N 752

Patent

active

055701329

ABSTRACT:
Device for transmitting or storing digital television pictures in which a maximum possible number of data of a group of transformed pixel blocks (DB.sub.1 . . . DB.sub.12) is transmitted in the form of variable-length code words (V.sub.1 . . . V.sub.N) in a corresponding channel block of predetermined length (FIG. 5A). If all code words of the groups of blocks are accommodated in the corresponding channel block (FIG. 5C), the channel block will also comprise surplus data of other blocks. The boundary, within a channel block, between these code words and surplus data is transmitted in the form of an address (P) which is accommodated at a predetermined position of the channel block. If the channel block length is inadequate for transmitting all code words of the group of blocks, the channel block (FIG. 5B), will comprise at least the code words which are representative of the DC coefficient and a number of important AC coefficients of each block. Said code words are accommodated in successive channel block sections (L.sub.1 . . . L.sub.12), with a code (C) for the length of these channel block sections being transmitted at predetermined positions of the channel block.

REFERENCES:
patent: 4398217 (1983-08-01), Peters
patent: 4901075 (1990-02-01), Vogel
patent: 4907101 (1990-03-01), Keesen et al.
patent: 5047852 (1991-09-01), Hanyu
patent: 5339108 (1994-08-01), Coleman
patent: 5444490 (1995-08-01), De With et al.

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