. The Bell System technical journal . J2Po(t+2r ;—RESULTANT PULSE P(t) .JoPo(t) J2(Po-27-) -^ P= Joa 0+Jiai-j,a-i y/ ip 1 \ +Jgag+Jaa-s ai| J, 1 Jo laoS^ a-, = o |J2 a-2 = o~Ji (c). (d) Fig. 20 — Determination of resultant pulse by superposition of pulse echoes. 756 THE BELL SYSTEM TECHNICAL JOURNAL, MAY 1954 Table I — Amplitudes of Echoes, /„(6) b = 1 2 5 10 15 n = 0 1 2 3 4 5 6
. The Bell System technical journal . J2Po(t+2r ;—RESULTANT PULSE P(t) .JoPo(t) J2(Po-27-) -^ P= Joa 0+Jiai-j,a-i y/ ip 1 \ +Jgag+Jaa-s ai| J, 1 Jo laoS^ a-, = o |J2 a-2 = o~Ji (c). (d) Fig. 20 — Determination of resultant pulse by superposition of pulse echoes. 756 THE BELL SYSTEM TECHNICAL JOURNAL, MAY 1954 Table I — Amplitudes of Echoes, /„(6) b = 1 2 5 10 15 n = 0 1 2 3 4 5 6 7 0,2167 8 9 10 -0 0901 11 12 13 14 15 16 17 18 19 20 lar case the maximum amplitude h is at the maximum frequency wmax= 2wi, so that sin wr = 1, or wr = 7r/2, for w = 2wi. Hence the intervalbetween pulse echoes is r = 7r/4coi = l/8/i . The interval r is accordingly}4, the interval n •= l/2/i required for the pulse Po(t) to reach zero ampli-tude in the absence of phase distortion. PHASECHARACTERIST
Size: 3195px × 782px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
