Methods of noise-reduced and bandwidth-reduced television transm

Details Methods of noise-reduced and bandwidth-reduced television transm Methods of noise-reduced and bandwidth-reduced television transm

1992-06-15

1994-02-08

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

380 34, 348473, 348384, 348725, 348723, H04L 2730, H04N 538, H04N 540, H04N 544

Patent

active

052854701

ABSTRACT:
A noise-reduced method of transmitting a video signal including separating the video signal into a plurality of frequency subbands representing a corresponding plurality of subband images, each of which is made up of a corresponding array of blocks of samples; for a preselected one of the subband images, measuring the busyness of each of the blocks of that subband image; for the preselected subband image, assigning each of the blocks of that subband image to one of a plurality of groups, the plurality of groups including a group of more busy blocks and a group of less busy blocks; adaptively modulating the samples of the selected subband image by multiplying the selected subband image by a set of adaptive modulation factors, wherein a greater quantity of adaptive modulation factors is used for the blocks assigned to the group of more busy blocks as compared to the blocks assigned to the group of less busy blocks; and transmitting the adaptively modulated selected subband image along with the set of adaptive modulation factors corresponding thereto.

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