. The Bell System technical journal . The logarithmic scale has the advantage ofmaking the curve shape independent of exposure length and giving uni-form relative accuracy over the entire range. Fig. 9 shows some typical results obtained by means of the proba-biloscope. The two small curves are distributions of two different stillpictures. The left-hand end corresponds to black, the right-hand end topeak white; the blanking intervals (slightly blacker than black) causethe peaks at the extreme left. (The signals did not contain any synchro-nizing pulses.) The tall and slender curve at the right
. The Bell System technical journal . The logarithmic scale has the advantage ofmaking the curve shape independent of exposure length and giving uni-form relative accuracy over the entire range. Fig. 9 shows some typical results obtained by means of the proba-biloscope. The two small curves are distributions of two different stillpictures. The left-hand end corresponds to black, the right-hand end topeak white; the blanking intervals (slightly blacker than black) causethe peaks at the extreme left. (The signals did not contain any synchro-nizing pulses.) The tall and slender curve at the right of Fig. 9 is thedistribution of errors resulting from previous-value prediction of oneof the pictures in Fig. 4. The peak corresponds to zero error which isseen to be most probable, as it should be if the prediction criterion isgood. Increasingly larger errors are increasingly improbable or six decades of probability density spanned by the curve were ob-tained in three separate exposures and subsequently joined, since stray. 1 W- TT TT 1 SCENE A 1 s ■li-,-- + . ::: ::- : ORIGINAL SIGNAL _ TT- - -T T T-- - .--.\l .jl t 10-1 m--\ F :- :■: 4- htt-::::i tT^ 5 fw% f :| P hi[r A ^. ^ ■---++ -- - -- T JL: + (rx in-2 * \ I ;Si::- + :± ih ... --: ::i:;-^s! 5 TFt uti it : .. : :-- ::-.| -\-- ? T - f- ffl 11: ^fl if i^ SCENE APREVIOUS VALUE a- M i 1 ■• iit: 1 rj- :l|::::::::::::::::: 2 •• •■ ;;|:: ::::::: : :::j::::: 10-1 i = f = # ^fi^ii^y 2^|i 11:: E 1—5 §=■■- -r -It - lT:r-f , / i:::::::,:::::::: %t: %-- ;:;;;;;;;i! 2.:-- -- - :x^::::- 1 4:5 iX .1; .... X jl . .. : :j :::.. .. !;.:::: ^ 10-3 - r t T 5 |ttj * i p.:::.: :: H t gS :.. -X :::::::::::: : ;-: : gJ :! 2 -■ .._ -- ::;: : ^, ::: 10-4::: ;:;:;;;.::::::;;,,!:::::: 5 ::: *---::-:- ;■ ::::: : ::::: , :; ^X 10-5 02468 10 02468 10 AMPLITUDE, X, IN ARBITRARY UNITS Fig. 9—Typical probability distributions as obtained from the at left are for video signals; right-hand
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
