Compression of signals for perceptual quality by selecting frequ

Details Compression of signals for perceptual quality by selecting frequ Compression of signals for perceptual quality by selecting frequ

1991-03-12

1996-09-24

Boudreau, Leo

Image analysis

Image compression or coding

Transform coding

348403, G06K 936

Patent

active

055599001

ABSTRACT:
Compression of signals is achieved through a simple decision of whether or not to encode certain frequency bands; not how well to encode all of the frequency bands. Based on the input signal and on a preselected perceptual model, a "just noticeable difference" (jnd) noise spectrum is computed. This spectrum is applied to a selector where it is used in the decision to select a chosen number of frequency bands of the input signal. The bands selected are the bands with the greatest energy relative to the jnd energy in the same band. Each of the selected bands is encoded and transmitted to the receiver. Both analog and digital realizations are presented.

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