. Le journal technique de Bell System . se trouve également à la référence 4. 696 THE BELL SYSTEM TECHNICAL JOURNAL, MAI 1957 40 38 36 34 32 30 28 26 24 22 20 18 1614 SIGNAL POWER IN DECIBELS BELOW FULL LOAD SINUSOID5 10 15 20 25 30 35 40 45 50 < CCLU 5 O Q. TROTRTR & LT; z // = 100 200 n = 7 0=6 B=OOA=l/Y2. —RAPPORT SIGNAL V/PUISSANCE SONORE MAXIMALE FIG. 20 — courbes illustrant la comparaison des rapports signal/quantification de la puissance d'erreur avec le rapport signal/bruit de fond. La ligne representle rapport signal/bruit maximum correspond au cas hypothétique où le backgroun maximum

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. The Bell System technical journal . is also to be found in Reference 4. 696 THE BELL SYSTEM TECHNICAL JOURNAL, MAY 1957 40 38 36 34 32 30 28 26 24 22 20 18 1614 SIGNAL POWER IN DECIBELS BELOW FULL LOAD SINUSOID5 10 15 20 25 30 35 40 45 50 < CCLU 5 o Q. trOtrtr < z // = 100 200 n = 7 0=6 B=ooA=l/Y2. —V SIGNAL TO MAXIMUM NOISE POWER RATIO Fig. 20 — Curves illustrating the comparison of signal to quantizing errorpower ratios with the ratio of signal to background noise. The line representingthe signal to maximum noise ratios corresponds to the hypothetical case wherethe maximum background noise is determined bj- the requirement that the signalto noise ratio be 20 db for a signal 50 db below full sinusoidal modulation. sidering a value providing a signal to noise ratio of 20 db for the weakestsignals in our hypothetical system. A signal to maximum noise powercurve may then be dra^Mi as a function of signal power for this constantvalue of noise power. Such a graph has been combined, in Fig. 20, withcurves such as those which have previously appeared in Figs. 15 to 19.These curves have been terminated at their intersections with the linerepresenting the signal to maximum noise power ratio since we areassuming that little benefit will be derived from a signal to quantizingerror po

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