. The Bell System technical journal . , acomax = The corresponding delaydistortion is f/max = 2a),„axiS. Thus l3/a = .68 c?,„ax/max so that ()becomes: k = ^o[l + (f/„.ax/max)T. (11-12) The effect of a linear delay distortion across the transmission band isthus to disperse or broaden the envelope of the received pulses, as illus- THEORETICAL FUNDAMENTALS OF PULSE TRANSMISSION ■87 tratcil in Fig. 41. For a specified pulse overlap or iiitersyinl)()l inlerfereiuethe pulse spacing must accordingly l)e increased by the factor ti/d, , sothat for a given transmission performance the tra
. The Bell System technical journal . , acomax = The corresponding delaydistortion is f/max = 2a),„axiS. Thus l3/a = .68 c?,„ax/max so that ()becomes: k = ^o[l + (f/„.ax/max)T. (11-12) The effect of a linear delay distortion across the transmission band isthus to disperse or broaden the envelope of the received pulses, as illus- THEORETICAL FUNDAMENTALS OF PULSE TRANSMISSION ■87 tratcil in Fig. 41. For a specified pulse overlap or iiitersyinl)()l inlerfereiuethe pulse spacing must accordingly l)e increased by the factor ti/d, , sothat for a given transmission performance the transmission capacity isretlucetl by the factor (o/d . About the same effect would be expected forother pulse shapes or amplitude characteristics resembling the (laussianshape assumed in the above deriA-ation. Comparison of () with () shows that the function (^(/) withrespect to the midband frequency is ^(0 = e - hr. () If the reference or carrier fre(iuency is displaced from the midband by AMPLITUDE CHARACTERISTIC. FREQUENCY —^ DELAY DISTORTION(a) TRANSMISSION FREQUENCY CHARACTERISTIC WITHOUT DELAY DISTORTION-,/ ■\WITH DELAY DISTORTION
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
