E {\displaystyle E} m {\displaystyle m} m f ( t ) {\displaystyle mf(t)} E m {\displaystyle E_{m}}
( 2 π f p t ) {\displaystyle (2\pi f_{p}t)} e ( t ) {\displaystyle e(t)} ω p {\displaystyle {\text{ω}}_{p}}
e ( t ) = E m ( t ) cos a p ( t ) {\displaystyle e(t)=E_{m}(t)\cos a_{p}(t)} ω {\displaystyle {\text{ω}}}
e ( t ) = E m ( t ) cos ω p ( t ) {\displaystyle e(t)=E_{m}(t)\cos {\text{ω}}_{p}(t)}
E m ( t ) = E [ 1 + m f ( t ) ] {\displaystyle E_{m}(t)=E[1+mf(t)]}
pentru m = 0 {\displaystyle m=0}
e ( t ) = E cos ω p ( t ) {\displaystyle e(t)=E\cos {\text{ω}}_{p}(t)} oscilatia purtatoare
m {\displaystyle m} grad de modulatie
f ( t ) {\displaystyle f(t)} semnalul modulator normat cu
f ( t ) ¯ = 0 {\displaystyle {\overline {f(t)}}=0}
| f ( t ) | max = 1 {\displaystyle \left|f(t)\right|_{\text{max}}=1}
f ( t ) = cos ω t {\displaystyle f(t)=\cos {\text{ω}}t}
e ( t ) = E m ( t ) cos ω p ( t ) = E ( 1 + m cos ω ( t ) ) cos ω p ( t ) = E cos ω t + m E cos ω ( t ) cos ω p ( t ) = E cos ω t + m E 2 cos ( ω p + ω ) ( t ) + m E 2 cos ( ω p − ω ) ( t ) {\displaystyle e(t)=E_{m}(t)\cos {\text{ω}}_{p}(t)=E(1+m\cos {\text{ω}}(t))\cos {\text{ω}}_{p}(t)=E\cos {\text{ω}}t+mE\cos {\text{ω}}(t)\cos {\text{ω}}_{p}(t)=E\cos {\text{ω}}t+{\frac {mE}{2}}\cos({\text{ω}}_{p}+{\text{ω}})(t)+{\frac {mE}{2}}\cos({\text{ω}}_{p}-{\text{ω}})(t)}
2 ω M 2 π = ω M π = {\displaystyle {\frac {2{\text{ω}}_{M}}{2\pi }}={\frac {{\text{ω}}_{M}}{\pi }}=} sau 2 f M {\displaystyle 2f_{M}} unde f M = ω M 2 π {\displaystyle f_{M}={\frac {{\text{ω}}_{M}}{2\pi }}}