JEE Main2013PhysicsCommunication SystemActual
If a carrier wave c ( t )= A _ c t is amplitude modulated by a modulator signal m ( t )= A sin _ m t then the equation of modulated signal [ C _ m ( t ) ] and its modulation index are respectively
Options
- AC_m(t)=A (1+ _m t ) _c t and 2
- BC_m(t)=A (1+ _m t ) _m t and 1
- CC_m(t)=A (1+ _m t ) _c t and 1
- DC_m(t)=A (1+ _c t ) _m t and 2
Correct answer
C. C_m(t)=A (1+ _m t ) _c t and 1
Step-by-step solution
Modulation index m _ a = E _ m E _ c = A A =1 Equation of modulated signal [ C _ m ( t ) ] = E _ ( C ) + m _ a E _ ( C ) _ m ^ t = A (1+ w _ C t ) _ m t ( . As . E _ ( C ) = A _ c t )