Frequency modulation Frequency modulation also generates sidebands, the bandwidth consumed depending on the modulation index - often requiring significantly more bandwidth than DSB. Bessel functions can be used to calculate the bandwidth requirements of FM transmissions. Carson's rule is a useful approximation of bandwidth in several applications.
FrEqueNcy mODulATIOn FrequeNcY modulaTION aLso GenerATes sIdebanDs, the BANDwidth cOnSumEd DEpEndiNg on the mOdulation indEx - often reQuIrIng SignifICaNtlY morE bandwidth ThaN dsB. beSsEL FunCtions can be uSEd to calCulate The BAndWiDth RequirEmenTs oF FM TrAnsmissIOns. cARSOn's rule Is a usefUl apPrOximatiOn of baNdwidtH in seVEral AppLIcations.