Độ lệch pha

$Δφ = (2n + 1)π$ (với n nguyên).

$Δφ = (2n + 1)π/2$ (với n nguyên).

$Δφ = (2n + 1)π/4$ (với n nguyên).

$Δφ = 2nπ$ (với n nguyên).

Ngược pha.
 

Đồng pha.

Lệch pha nhau góc bất kì

Vuông pha.

0,75π

0,50π.

0,25π.

1,25π.

${\rm{x}}_{\rm{1}} {\rm=}\,\,\rm 3cos(\pi {\rm{t}}\,\,{\rm+}\,\,\dfrac{\pi }{{\rm{4}}}\rm)cm$ và ${\rm{x}}_{\rm{2}}\rm= 3cos(\pi {\rm{t-}}\,\dfrac{\pi}{{\rm{6}}}\rm) cm$

${\rm{x}}_{\rm{1}}\rm=\,\,\rm 3cos(\pi \rm{t}\,\,\rm+\,\,\dfrac{\pi }{{\rm{6}}}\rm) cm$ và ${\rm{x}}_{\rm{2}} \,\,\rm=\,\,\rm 3cos(\pi {\rm{t}}\,\,{\rm+}\,\,\dfrac{\pi }{{\rm{3}}}\rm) cm$

${\rm{x}}_{\rm{1}} \,{\rm=}\,\,\rm 4cos(\pi {\rm{t}}\,\,{\rm+}\,\,\dfrac{\pi }{{\rm{6}}}\rm)cm$ và ${\rm{x}}_{\rm{2}} \,{\rm=}\,\,\rm 5cos(\pi {\rm{t}}\,\,{\rm+}\,\,\dfrac{\pi }{{\rm{6}}}\rm)cm$

${\rm{x}}_{\rm{1}} \,{\rm=}\,\,\rm 2cos(2\pi {\rm{t}}\,\,{\rm-}\,\,\dfrac{\pi }{{\rm{6}}}\rm)cm$ và ${\rm{x}}_{\rm{2}}{\rm=}\,\,\rm 2cos(\pi {\rm{t}}\,\,\rm+\,\,\dfrac{\pi }{{\rm{6}}}\rm) cm$