H - Electricity – 04 – L
Patent
H - Electricity
04
L
354/106, 354/68
H04L 25/49 (2006.01) H04N 1/413 (2006.01) H04H 1/02 (2006.01)
Patent
CA 1043908
NON-SYNCHRONOUS DUOBINARY ENCODING ABSTRACT OF THE DISCLOSURE To provide spectrum compression for non-synchronous data signals, there is-a method and means for carrying out a two-to-three level encoding process in which the encoding polarity for each excursion of the data signal from a pre- determined level is selected as a function of (1) of encoding polarity for any immediately preceeding excursion and (2) the interval of time between those excursions. This en- coding technique may be used to advantage in, for example, limited bandwidth facsimile systems to encode the baseband signal in a manner which not only provides substantial spectrum compression, but which also virtually forces the system to respond to single, isolated, black picture elements. Specifically, for that application, the timing is selected so that the white picture elements at opposite sides of any single, isolated, black picture element are encoded with opposite polarities.
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