. The Bell System technical journal . three componentseach having the same shape as the pulse or signal Po{t), but differing inamplitude and displaced in time, as indicated in Fig. 27. For small values of the amplitude a of the cosine deviation, r = a/2and I -{- r~ = 1, so that Pit) = Poit) + aPoit - r) + ^ Poit - 2r). () The solution for a somew^hat similar case given elsewhere,^ has aninfinite number of echoes, with the second echo given by a Poit — 2t)rather than (a /4:)Po(t — 2r) as above. In the case referred to, the ampli-tude deviation is in a first approximation a cos cor, but ther

---

. The Bell System technical journal . three componentseach having the same shape as the pulse or signal Po{t), but differing inamplitude and displaced in time, as indicated in Fig. 27. For small values of the amplitude a of the cosine deviation, r = a/2and I -{- r~ = 1, so that Pit) = Poit) + aPoit - r) + ^ Poit - 2r). () The solution for a somew^hat similar case given elsewhere,^ has aninfinite number of echoes, with the second echo given by a Poit — 2t)rather than (a /4:)Po(t — 2r) as above. In the case referred to, the ampli-tude deviation is in a first approximation a cos cor, but there are addi-tional terms in cos 2oot, cos Scot etc, which are responsible for the differentamplitude of the second echo and for the infinite sequence of echoes. With a cosine modification in the attenuation characteristic as givenby (), there will be a corresponding sine modification in the phasecharacteristic in accordance with (). The modified transmission- (a) RATIO OF AMPLITUDECHARACTERISTICS (b) IMPULSE CHARACTERISTIC. FREQUENCY, Cv

---

Size: 2023px × 1235px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1