. The Bell System technical journal . value of Wx is taken to bew,/2. The in-phase and quadrature components with respect to anj^ fre-quency are obtained from () with xpy = (jiTd and are shown in for the particular case in which the reference frequency is displacedfrom the midband frequency by co^ = cos . THEORETICAL FITNDAMEXTALS OF IlLSK T1{AXSMIRST().\ i;-! 5. IDEALIZED ClIAUACTERISTICS WITH NATURAL LINEAR Sill FT With the type of amplitude characteristics discussed above it isnecessary to employ phase equaUzation to obtain a linear phase charac-teristic. Furthermore, osc
. The Bell System technical journal . value of Wx is taken to bew,/2. The in-phase and quadrature components with respect to anj^ fre-quency are obtained from () with xpy = (jiTd and are shown in for the particular case in which the reference frequency is displacedfrom the midband frequency by co^ = cos . THEORETICAL FITNDAMEXTALS OF IlLSK T1{AXSMIRST().\ i;-! 5. IDEALIZED ClIAUACTERISTICS WITH NATURAL LINEAR Sill FT With the type of amplitude characteristics discussed above it isnecessary to employ phase equaUzation to obtain a linear phase charac-teristic. Furthermore, oscillations of appreciable amplitude remain inthe impulse characteristic. A virtually linear phase characteristic to-gether with a reduction of these oscillations can be attained by a furtherextension of the gradual cut-off in Fig. 10, such that co^ = coi . An ampli-tude characteristic of this type, together with the corresponding impulse 1 N 1 1 1 \ 1 1 \ 1 111 V (a) FREQUENCYCHARACTERISTIC Fig. 11 —Low-i);iss with gradual cut-ofl and impulisecharacteristic. Linear phase 744 THE BELL SYSTEM TECHNICAL JOURNAL, MAY 1954 UJ \ V \ \ / \ t ^u;r \ 5 / \ ^ /k-^s-^ K UJ% - -^\ 0 / V FREQUENCY(a) FREQUENCY CHARACTERISTIC
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
