... lOOHz phat cao han so vdi am cd tan so /2= 120 077Z - Am cd tin sd /2 = 120 077z phat cao han so vdi am cd tin s o / , = 90077Z Dp cao phu thudc vao tin so cua am: Tan sd Idn nghe tha'y am cao, tin ... X2 toa dp X] va JC2 la : - Xac dinh dp lech pha cua hai dilm dd M(r) = cos 2^ ft—^^1 \ /L ; \ M(r) = Acos fo /> 2^ 2^ ft -X2 Suy dp lech pha giua hai dilm : | A^ = y( ^2- ^i) = ^ ^^[x2-X]) : = 2, 5cm ... Acp = 2^ ;r, suy hai dao ddng dupc truyin de'n tir hai ngudn 5,, 52 ddng pha 2TT => A^ = — [d2-d]) A ^ d2-d] = 2kTT =kA vdi A: = 0,±l, 2, Ne'u dilm M khdng dao ddng thi: Acp cos- ^ ^ = [2k + X)'L...